validate canons without yatest_common

136 files changed, 16457 insertions, 0 deletions

diff --git a/library/cpp/tvmauth/README.md b/library/cpp/tvmauth/README.md
new file mode 100644
index 0000000000..ec64bbbcdb
--- /dev/null
+++ b/library/cpp/tvmauth/README.md
@@ -0,0 +1,2 @@
+This part of library contains primitives for TVM operation.
+Please use high-level [TTvmClient](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/README.md).
diff --git a/library/cpp/tvmauth/checked_service_ticket.h b/library/cpp/tvmauth/checked_service_ticket.h
new file mode 100644
index 0000000000..71dc48b7cb
--- /dev/null
+++ b/library/cpp/tvmauth/checked_service_ticket.h
@@ -0,0 +1,76 @@
+#pragma once
+
+#include "ticket_status.h"
+#include "type.h"
+#include "utils.h"
+
+#include <util/generic/ptr.h>
+
+namespace NTvmAuth::NInternal {
+    class TCanningKnife;
+}
+
+namespace NTvmAuth {
+    class TCheckedServiceTicket {
+    public:
+        class TImpl;
+
+        TCheckedServiceTicket(THolder<TImpl> impl);
+        TCheckedServiceTicket(TCheckedServiceTicket&& o);
+        ~TCheckedServiceTicket();
+
+        TCheckedServiceTicket& operator=(TCheckedServiceTicket&&);
+
+        /*!
+         * @return True value if ticket parsed and checked successfully
+         */
+        explicit operator bool() const;
+
+        /*!
+         * @return TTvmId of request destination
+         */
+        TTvmId GetDst() const;
+
+        /*!
+         * You should check src with your ACL
+         * @return TvmId of request source
+         */
+        TTvmId GetSrc() const;
+
+        /*!
+         * @return Ticket check status
+         */
+        ETicketStatus GetStatus() const;
+
+        /*!
+         * DebugInfo is human readable data for debug purposes
+         * @return Serialized ticket
+         */
+        TString DebugInfo() const;
+
+        /*!
+         * IssuerUID is UID of developer who is debuging something,
+         * so he(she) issued ServiceTicket with his(her) ssh-sign:
+         * it is grant_type=sshkey in tvm-api.
+         * https://wiki.yandex-team.ru/passport/tvm2/debug/#sxoditvapizakrytoeserviceticketami
+         * @return uid
+         */
+        TMaybe<TUid> GetIssuerUid() const;
+
+    public: // for python binding
+        TCheckedServiceTicket() = default;
+
+    private:
+        THolder<TImpl> Impl_;
+        friend class NInternal::TCanningKnife;
+    };
+
+    namespace NBlackboxTvmId {
+        const TStringBuf Prod = "222";
+        const TStringBuf Test = "224";
+        const TStringBuf ProdYateam = "223";
+        const TStringBuf TestYateam = "225";
+        const TStringBuf Stress = "226";
+        const TStringBuf Mimino = "239";
+    }
+}
diff --git a/library/cpp/tvmauth/checked_user_ticket.h b/library/cpp/tvmauth/checked_user_ticket.h
new file mode 100644
index 0000000000..16a2a6dc30
--- /dev/null
+++ b/library/cpp/tvmauth/checked_user_ticket.h
@@ -0,0 +1,91 @@
+#pragma once
+
+#include "ticket_status.h"
+#include "type.h"
+#include "utils.h"
+
+#include <util/generic/ptr.h>
+
+namespace NTvmAuth::NInternal {
+    class TCanningKnife;
+}
+
+namespace NTvmAuth {
+    /*!
+     * BlackboxEnv describes environment of Passport:
+     * https://wiki.yandex-team.ru/passport/tvm2/user-ticket/#0-opredeljaemsjasokruzhenijami
+     */
+    enum class EBlackboxEnv: ui8 {
+        Prod,
+        Test,
+        ProdYateam,
+        TestYateam,
+        Stress
+    };
+
+    /*!
+     * UserTicket contains only valid users.
+     * Details: https://wiki.yandex-team.ru/passport/tvm2/user-ticket/#chtoestvusertickete
+     */
+    class TCheckedUserTicket {
+    public:
+        class TImpl;
+
+        TCheckedUserTicket(THolder<TImpl> impl);
+        TCheckedUserTicket(TCheckedUserTicket&&);
+        ~TCheckedUserTicket();
+
+        TCheckedUserTicket& operator=(TCheckedUserTicket&&);
+
+        /*!
+         * @return True value if ticket parsed and checked successfully
+         */
+        explicit operator bool() const;
+
+        /*!
+         * Never empty
+         * @return UIDs of users listed in ticket
+         */
+        const TUids& GetUids() const;
+
+        /*!
+         * Maybe 0
+         * @return Default user in ticket
+         */
+        TUid GetDefaultUid() const;
+
+        /*!
+         * Scopes inherited from credential - never empty
+         * @return Newly constructed vector of scopes
+         */
+        const TScopes& GetScopes() const;
+
+        /*!
+         * Check if scope presented in ticket
+         */
+        bool HasScope(TStringBuf scopeName) const;
+
+        /*!
+         * @return Ticket check status
+         */
+        ETicketStatus GetStatus() const;
+
+        /*!
+         * DebugInfo is human readable data for debug purposes
+         * @return Serialized ticket
+         */
+        TString DebugInfo() const;
+
+        /*!
+         * Env of user
+         */
+        EBlackboxEnv GetEnv() const;
+
+    public: // for python binding
+        TCheckedUserTicket() = default;
+
+    private:
+        THolder<TImpl> Impl_;
+        friend class NInternal::TCanningKnife;
+    };
+}
diff --git a/library/cpp/tvmauth/client/README.md b/library/cpp/tvmauth/client/README.md
new file mode 100644
index 0000000000..cda6a22d3c
--- /dev/null
+++ b/library/cpp/tvmauth/client/README.md
@@ -0,0 +1,84 @@
+Overview
+===
+This library provides ability to operate with TVM. Library is fast enough to get or check tickets for every request without burning CPU.
+
+[Home page of project](https://wiki.yandex-team.ru/passport/tvm2/)
+You can find some examples in [here](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/examples).
+
+You can ask questions: [PASSPORTDUTY](https://st.yandex-team.ru/createTicket?queue=PASSPORTDUTY&_form=77618)
+
+TvmClient
+===
+Don't forget to collect logs from client.
+___
+`TvmClient` allowes:
+1. `GetServiceTicketFor()` - to fetch ServiceTicket for outgoing request
+2. `CheckServiceTicket()` - to check ServiceTicket from incoming request
+3. `CheckUserTicket()` - to check UserTicket from incoming request
+4. `GetRoles()` - to get roles from IDM
+
+All methods are thread-safe.
+
+You should check status of `CheckedServiceTicket` or `CheckedUserTicket` for equality 'Ok'. You can get ticket fields (src/uids/scopes) only for correct ticket. Otherwise exception will be thrown.
+___
+You should check status of client with `GetStatus()`:
+* `OK` - nothing to do here
+* `Warning` - **you should trigger your monitoring alert**
+
+      Normal operation of TvmClient is still possible but there are problems with refreshing cache, so it is expiring.
+      Is tvm-api.yandex.net accessible?
+      Have you changed your TVM-secret or your backend (dst) deleted its TVM-client?
+
+* `Error` - **you should trigger your monitoring alert and close this instance for user-traffic**
+
+      TvmClient's cache is already invalid (expired) or soon will be: you can't check valid ServiceTicket or be authenticated by your backends (dsts)
+
+___
+Constructor creates system thread for refreshing cache - so do not fork your proccess after creating `TTvmClient` instance. Constructor leads to network I/O. Other methods always use memory.
+
+Exceptions maybe thrown from constructor:
+* `TRetriableException` - maybe some network trouble: you can try to create client one more time.
+* `TNonRetriableException` - settings are bad: fix them.
+___
+You can choose way for fetching data for your service operation:
+* http://localhost:{port}/tvm - recomended way
+* https://tvm-api.yandex.net
+
+TvmTool
+------------
+`TTvmClient` uses local http-interface to get state. This interface can be provided with tvmtool (local daemon) or Qloud/YP (local http api in container).
+See more: https://wiki.yandex-team.ru/passport/tvm2/tvm-daemon/.
+
+`TTvmClient` fetches configuration from tvmtool, so you need only to tell client how to connect to it and tell which alias of tvm id should be used for this `TvmClient` instance.
+
+TvmApi
+------------
+First of all: please use `DiskCacheDir` - it provides reliability for your service and for tvm-api.
+Please check restrictions of this field.
+
+Roles
+===
+[Example](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/examples/create_with_tvmapi/create.cpp?rev=r8888584#L84)
+
+You need to configure roles fetching
+------------
+1. Enable disk cache: [DiskCacheDir](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/misc/api/settings.h?rev=r9001419#L54)
+
+2. Enable ServiceTicket fetching:
+     [SelfTvmId](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/misc/api/settings.h?rev=r9001419#L57) + [Secret](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/misc/api/settings.h?rev=r9001419#L60)
+3. Enable roles fetching from tirole:
+    [FetchRolesForIdmSystemSlug](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/misc/api/settings.h?rev=r9001419#L78)
+
+You need to use roles for request check
+------------
+1. Check ServiceTicket and/or UserTicket - as usual:
+     [CheckServiceTicket()](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/facade.h?rev=r7890770#L91)/[CheckUserTicket()](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/facade.h?rev=r7890770#L99)
+
+2. Get actual roles from `TvmClient`: [GetRoles()](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/facade.h?rev=r7890770#L105)
+
+3. Use roles
+     - case#1: [get](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/misc/roles/roles.h?rev=r7890770#L37-46) role list for service or user and check for the exact role you need.
+     - case#2: use [shortcuts](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/misc/roles/roles.h?rev=r7890770#L50) - they are wrappers for case#1
+
+4. If consumer (service or user) has required role, you can perform request.
+     If consumer doesn't have required role, you should show error message with useful message.
diff --git a/library/cpp/tvmauth/client/client_status.cpp b/library/cpp/tvmauth/client/client_status.cpp
new file mode 100644
index 0000000000..eca35ba22b
--- /dev/null
+++ b/library/cpp/tvmauth/client/client_status.cpp
@@ -0,0 +1,6 @@
+#include "client_status.h"
+
+template <>
+void Out<NTvmAuth::TClientStatus>(IOutputStream& out, const NTvmAuth::TClientStatus& s) {
+    out << s.GetCode() << ": " << s.GetLastError();
+}
diff --git a/library/cpp/tvmauth/client/client_status.h b/library/cpp/tvmauth/client/client_status.h
new file mode 100644
index 0000000000..bbaf29d289
--- /dev/null
+++ b/library/cpp/tvmauth/client/client_status.h
@@ -0,0 +1,82 @@
+#pragma once
+
+#include <util/generic/string.h>
+#include <util/string/builder.h>
+
+namespace NTvmAuth {
+    class TClientStatus {
+    public:
+        enum ECode {
+            Ok,
+            Warning,
+            Error,
+            IncompleteTicketsSet,
+        };
+
+        TClientStatus(ECode state, TString&& lastError)
+            : Code_(state)
+            , LastError_(std::move(lastError))
+        {
+        }
+
+        TClientStatus() = default;
+        TClientStatus(const TClientStatus&) = default;
+        TClientStatus(TClientStatus&&) = default;
+
+        TClientStatus& operator=(const TClientStatus&) = default;
+        TClientStatus& operator=(TClientStatus&&) = default;
+
+        ECode GetCode() const {
+            return Code_;
+        }
+
+        const TString& GetLastError() const {
+            return LastError_;
+        }
+
+        TString CreateJugglerMessage() const {
+            return TStringBuilder() << GetJugglerCode() << ";TvmClient: " << LastError_ << "\n";
+        }
+
+    private:
+        int32_t GetJugglerCode() const {
+            switch (Code_) {
+                case ECode::Ok:
+                    return 0; // OK juggler check state
+                case ECode::Warning:
+                case ECode::IncompleteTicketsSet:
+                    return 1; // WARN juggler check state
+                case ECode::Error:
+                    return 2; // CRIT juggler check state
+            }
+            return 2; // This should not happen, so set check state as CRIT.
+        }
+
+        ECode Code_ = Ok;
+        TString LastError_;
+    };
+
+    static inline bool operator==(const TClientStatus& l, const TClientStatus& r) noexcept {
+        return l.GetCode() == r.GetCode() && l.GetLastError() == r.GetLastError();
+    }
+
+    static inline bool operator==(const TClientStatus& l, const TClientStatus::ECode r) noexcept {
+        return l.GetCode() == r;
+    }
+
+    static inline bool operator==(const TClientStatus::ECode l, const TClientStatus& r) noexcept {
+        return r.GetCode() == l;
+    }
+
+    static inline bool operator!=(const TClientStatus& l, const TClientStatus& r) noexcept {
+        return !(l == r);
+    }
+
+    static inline bool operator!=(const TClientStatus& l, const TClientStatus::ECode r) noexcept {
+        return !(l == r);
+    }
+
+    static inline bool operator!=(const TClientStatus::ECode l, const TClientStatus& r) noexcept {
+        return !(l == r);
+    }
+}
diff --git a/library/cpp/tvmauth/client/examples/create_with_tvmapi/create.cpp b/library/cpp/tvmauth/client/examples/create_with_tvmapi/create.cpp
new file mode 100644
index 0000000000..c03a7a032f
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/create_with_tvmapi/create.cpp
@@ -0,0 +1,102 @@
+#include <library/cpp/tvmauth/client/facade.h>
+
+namespace NExample {
+    NTvmAuth::TTvmClient CreateClientForCheckingAllTicketsAndFetchingServiceTickets() {
+        NTvmAuth::NTvmApi::TClientSettings setts{
+            .DiskCacheDir = "/var/cache/my_service/tvm/",
+            .SelfTvmId = 11,
+            .Secret = (TStringBuf) "AAAAAAAAAAAAAAAAAAAAAA",
+            .FetchServiceTicketsForDstsWithAliases = {
+                {"bb", 224},
+                {"datasync", 2000060},
+            },
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = NTvmAuth::EBlackboxEnv::Test,
+        };
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        // c.CheckServiceTicket("some service ticket")
+        // c.CheckUserTicket("some user ticket")
+        // c.GetServiceTicketFor("bb")
+        // c.GetServiceTicketFor(224)
+
+        return c;
+    }
+
+    NTvmAuth::TTvmClient CreateClientForCheckingAllTickets() {
+        NTvmAuth::NTvmApi::TClientSettings setts{
+            .DiskCacheDir = "/var/cache/my_service/tvm/",
+            .SelfTvmId = 11,
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = NTvmAuth::EBlackboxEnv::Test,
+        };
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        // c.CheckServiceTicket("some service ticket")
+        // c.CheckUserTicket("some user ticket")
+
+        return c;
+    }
+
+    NTvmAuth::TTvmClient CreateClientForFetchingServiceTickets() {
+        NTvmAuth::NTvmApi::TClientSettings setts{
+            .DiskCacheDir = "/var/cache/my_service/tvm/",
+            .SelfTvmId = 11,
+            .Secret = (TStringBuf) "AAAAAAAAAAAAAAAAAAAAAA",
+            .FetchServiceTicketsForDstsWithAliases = {
+                {"bb", 224},
+                {"datasync", 2000060},
+            },
+        };
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        // c.GetServiceTicketFor("bb")
+        // c.GetServiceTicketFor(224)
+
+        return c;
+    }
+
+    NTvmAuth::TTvmClient CreateClientForCheckingServiceTickets() {
+        NTvmAuth::NTvmApi::TClientSettings setts{
+            .DiskCacheDir = "/var/cache/my_service/tvm/",
+            .SelfTvmId = 11,
+            .CheckServiceTickets = true,
+        };
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        // c.CheckServiceTicket("some service ticket")
+
+        return c;
+    }
+
+    NTvmAuth::TTvmClient CreateClientForCheckingServiceTicketsWithRoles() {
+        NTvmAuth::NTvmApi::TClientSettings setts{
+            .DiskCacheDir = "/var/cache/my_service/tvm/",
+            .SelfTvmId = 11,
+            .Secret = (TStringBuf) "AAAAAAAAAAAAAAAAAAAAAA",
+            .CheckServiceTickets = true,
+            .FetchRolesForIdmSystemSlug = "passporttestservice",
+        };
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        // auto t = c.CheckServiceTicket("some service ticket")
+        // c.GetRoles()->CheckServiceRole(t, "some role");
+
+        return c;
+    }
+}
diff --git a/library/cpp/tvmauth/client/examples/create_with_tvmtool/create.cpp b/library/cpp/tvmauth/client/examples/create_with_tvmtool/create.cpp
new file mode 100644
index 0000000000..a87d3e705d
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/create_with_tvmtool/create.cpp
@@ -0,0 +1,34 @@
+#include <library/cpp/tvmauth/client/facade.h>
+
+namespace NExample {
+    // Possibility of using functions depends on config of tvmtool
+    //    CheckServiceTicket
+    //    CheckUserTicket
+    //    GetServiceTicketFor
+
+    NTvmAuth::TTvmClient CreateClientInQloudOrYandexDeploy() {
+        NTvmAuth::NTvmTool::TClientSettings setts(
+            "my_service" // specified in Qloud/YP/tvmtool interface
+        );
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        return c;
+    }
+
+    NTvmAuth::TTvmClient CreateClientForDevOrTests() {
+        NTvmAuth::NTvmTool::TClientSettings setts(
+            "my_service" // specified in Qloud/YP/tvmtool interface
+        );
+        setts.SetPort(18080);
+        setts.SetAuthToken("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        return c;
+    }
+}
diff --git a/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.cpp b/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.cpp
new file mode 100644
index 0000000000..075bf0bded
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.cpp
@@ -0,0 +1,84 @@
+#include "service.h"
+
+#include <library/cpp/tvmauth/client/facade.h>
+
+#include <library/cpp/cgiparam/cgiparam.h>
+#include <library/cpp/http/server/response.h>
+#include <library/cpp/http/simple/http_client.h>
+#include <library/cpp/json/json_reader.h>
+
+namespace NExample {
+    static const TString BACK_C = "BACK_C";
+
+    TSomeService::TSomeService(const TConfig& cfg)
+        : Config_(cfg)
+    {
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        Tvm_ = MakeHolder<NTvmAuth::TTvmClient>(
+            NTvmAuth::NTvmTool::TClientSettings(
+                "my_service" // specified in Qloud/YP/tvmtool interface
+                ),
+            log);
+    }
+
+    TSomeService::~TSomeService() {
+    }
+
+    void TSomeService::HandleRequest(THttpInput& in, THttpOutput& out) {
+        auto servIt = std::find_if(in.Headers().Begin(),
+                                   in.Headers().End(),
+                                   [](const auto& h) { return h.Name() == "X-Ya-Service-Ticket"; });
+        auto userIt = std::find_if(in.Headers().Begin(),
+                                   in.Headers().End(),
+                                   [](const auto& h) { return h.Name() == "X-Ya-User-Ticket"; });
+        try {
+            if (servIt == in.Headers().End() || userIt == in.Headers().End()) {
+                ythrow yexception() << "Need tickets";
+            }
+
+            // WARNING: См. Здесь
+            NTvmAuth::TCheckedServiceTicket st = Tvm_->CheckServiceTicket(servIt->Value());
+            NTvmAuth::TCheckedUserTicket ut = Tvm_->CheckUserTicket(userIt->Value());
+            if (!st || !ut) {
+                ythrow yexception() << "Invalid tickets";
+            }
+
+            // WARNING: См. Здесь
+            // Ждём ABC - после их релиза эти три строки можно будет удалить
+            if (Config_.AllowedTvmIds.find(st.GetSrc()) == Config_.AllowedTvmIds.end()) {
+                ythrow yexception() << "Consumer is not allowed";
+            }
+
+            // WARNING: См. Здесь
+            if (!ut.HasScope("some_service:allow_secret_data")) {
+                ythrow yexception() << "UserTicket does not have scopes for secret data";
+            }
+
+            // Access-log
+            Cout << "Data fetched for: " << ut.GetDefaultUid() << Endl;
+
+            THttpResponse resp(HTTP_OK);
+            resp.SetContent(GetDataFromBackendC(userIt->Value()), "text/plain");
+            resp.OutTo(out);
+        } catch (...) {
+            THttpResponse resp(HTTP_BAD_REQUEST);
+            resp.SetContent("Request can not be performed", "text/plain");
+            resp.OutTo(out);
+        }
+
+        out.Finish();
+    }
+
+    TString TSomeService::GetDataFromBackendC(const TString& userTicket) {
+        TSimpleHttpClient cl("my_backend", // specified in Qloud/YP/tvmtool interface
+                             80);
+        TStringStream s;
+        cl.DoGet("/api?",
+                 &s,
+                 // WARNING: См. Здесь
+                 {{"X-Ya-Service-Ticket", Tvm_->GetServiceTicketFor(BACK_C)},
+                  {"X-Ya-User-Ticket", userTicket}});
+        return s.Str();
+    }
+}
diff --git a/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.h b/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.h
new file mode 100644
index 0000000000..8ff948334e
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <library/cpp/http/io/stream.h>
+
+#include <util/generic/ptr.h>
+
+#include <unordered_set>
+
+namespace NTvmAuth {
+    class TTvmClient;
+}
+
+namespace NExample {
+    struct TConfig {
+        using TAllowedTvmIds = std::unordered_set<ui32>;
+
+        TAllowedTvmIds AllowedTvmIds;
+    };
+
+    class TSomeService {
+    public:
+        TSomeService(const TConfig& cfg);
+        ~TSomeService();
+
+        void HandleRequest(THttpInput& in, THttpOutput& out);
+
+    private:
+        TString GetDataFromBackendC(const TString& userTicket);
+
+    private:
+        // WARNING: См. Здесь
+        TConfig Config_;
+        THolder<NTvmAuth::TTvmClient> Tvm_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/exception.h b/library/cpp/tvmauth/client/exception.h
new file mode 100644
index 0000000000..c5faa006ad
--- /dev/null
+++ b/library/cpp/tvmauth/client/exception.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <library/cpp/tvmauth/exception.h>
+
+namespace NTvmAuth {
+    class TClientException: public TTvmException {
+    };
+
+    class TInternalException: public TTvmException {
+    };
+
+    class TRetriableException: public TClientException {
+    };
+    class TNonRetriableException: public TClientException {
+    };
+
+    class TIllegalUsage: public TNonRetriableException {
+    };
+
+    class TBrokenTvmClientSettings: public TIllegalUsage {
+    };
+    class TMissingServiceTicket: public TNonRetriableException {
+    };
+    class TPermissionDenied: public TNonRetriableException {
+    };
+}
diff --git a/library/cpp/tvmauth/client/facade.cpp b/library/cpp/tvmauth/client/facade.cpp
new file mode 100644
index 0000000000..59a682678f
--- /dev/null
+++ b/library/cpp/tvmauth/client/facade.cpp
@@ -0,0 +1,155 @@
+#include "facade.h"
+
+#include "misc/checker.h"
+#include "misc/default_uid_checker.h"
+#include "misc/getter.h"
+#include "misc/src_checker.h"
+#include "misc/api/threaded_updater.h"
+#include "misc/tool/threaded_updater.h"
+
+namespace NTvmAuth {
+    TTvmClient::TTvmClient(const NTvmTool::TClientSettings& settings, TLoggerPtr logger)
+        : Updater_(NTvmTool::TThreadedUpdater::Create(settings, std::move(logger)))
+        , NeedService_(true)
+        , NeedUser_(true)
+    {
+        Y_ENSURE_EX(Updater_->GetCachedServiceContext(), TInternalException() << "Unable to get cached service context");
+        Y_ENSURE_EX(Updater_->GetCachedUserContext(), TInternalException() << "Unable to get cached user context");
+
+        if (Updater_->GetCachedServiceTickets()) {
+            NeedTickets_ = true;
+        }
+
+        try {
+            if (settings.ShouldCheckSrc && Updater_->GetRoles()) {
+                NeedSrcChecker_ = true;
+            }
+
+            if (settings.ShouldCheckDefaultUid && Updater_->GetRoles()) {
+                NeedDefaultUidChecker_ = true;
+            }
+        } catch (const TBrokenTvmClientSettings&) {
+            // Roles are not configured
+        }
+    }
+
+    TTvmClient::TTvmClient(const NTvmApi::TClientSettings& settings, TLoggerPtr logger)
+        : Updater_(NTvmApi::TThreadedUpdater::Create(settings, std::move(logger)))
+        , NeedService_(settings.CheckServiceTickets)
+        , NeedUser_(settings.CheckUserTicketsWithBbEnv)
+        , NeedTickets_(settings.IsServiceTicketFetchingRequired())
+        , NeedSrcChecker_(settings.FetchRolesForIdmSystemSlug && settings.ShouldCheckSrc)
+        , NeedDefaultUidChecker_(settings.FetchRolesForIdmSystemSlug && settings.ShouldCheckDefaultUid)
+    {
+        ServiceTicketCheckFlags_.NeedDstCheck = settings.ShouldCheckDst;
+        if (NeedService_) {
+            Y_ENSURE_EX(Updater_->GetCachedServiceContext(), TInternalException() << "Unable to get cached service context");
+        }
+        if (NeedUser_) {
+            Y_ENSURE_EX(Updater_->GetCachedUserContext(), TInternalException() << "Unable to get cached user context");
+        }
+        if (NeedTickets_) {
+            Y_ENSURE_EX(Updater_->GetCachedServiceTickets(), TInternalException() << "Unable to get cached service tickets");
+        }
+        if (NeedSrcChecker_) {
+            GetRoles();
+        }
+        if (NeedDefaultUidChecker_) {
+            GetRoles();
+        }
+    }
+
+    TTvmClient::TTvmClient(
+        TAsyncUpdaterPtr updater,
+        const TServiceContext::TCheckFlags& serviceTicketCheckFlags)
+        : Updater_(std::move(updater))
+        , ServiceTicketCheckFlags_(serviceTicketCheckFlags)
+        , NeedService_(Updater_->GetCachedServiceContext())
+        , NeedUser_(Updater_->GetCachedUserContext())
+        , NeedTickets_(Updater_->GetCachedServiceTickets())
+    {
+        try {
+            if (Updater_->GetRoles()) {
+                NeedSrcChecker_ = true;
+                NeedDefaultUidChecker_ = true;
+            }
+        } catch (const TIllegalUsage&) {
+            // it is a test probably
+        }
+    }
+
+    TTvmClient::TTvmClient(TTvmClient&& o) = default;
+    TTvmClient::~TTvmClient() = default;
+    TTvmClient& TTvmClient::operator=(TTvmClient&& o) = default;
+
+    TClientStatus TTvmClient::GetStatus() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetStatus();
+    }
+
+    TInstant TTvmClient::GetUpdateTimeOfPublicKeys() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetUpdateTimeOfPublicKeys();
+    }
+
+    TInstant TTvmClient::GetUpdateTimeOfServiceTickets() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetUpdateTimeOfServiceTickets();
+    }
+
+    TInstant TTvmClient::GetInvalidationTimeOfPublicKeys() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetInvalidationTimeOfPublicKeys();
+    }
+
+    TInstant TTvmClient::GetInvalidationTimeOfServiceTickets() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetInvalidationTimeOfServiceTickets();
+    }
+
+    TString TTvmClient::GetServiceTicketFor(const TClientSettings::TAlias& dst) const {
+        Y_ENSURE_EX(NeedTickets_, TBrokenTvmClientSettings()
+                                      << "Need to enable ServiceTickets fetching");
+
+        TServiceTicketsPtr c = Updater_->GetCachedServiceTickets();
+        return TServiceTicketGetter::GetTicket(dst, c);
+    }
+
+    TString TTvmClient::GetServiceTicketFor(const TTvmId dst) const {
+        Y_ENSURE_EX(NeedTickets_, TBrokenTvmClientSettings()
+                                      << "Need to enable ServiceTickets fetching");
+        TServiceTicketsPtr c = Updater_->GetCachedServiceTickets();
+        return TServiceTicketGetter::GetTicket(dst, c);
+    }
+
+    TCheckedServiceTicket TTvmClient::CheckServiceTicket(TStringBuf ticket) const {
+        Y_ENSURE_EX(NeedService_, TBrokenTvmClientSettings()
+                                      << "Need to use TClientSettings::EnableServiceTicketChecking()");
+
+        TServiceContextPtr c = Updater_->GetCachedServiceContext();
+        TCheckedServiceTicket res = TServiceTicketChecker::Check(ticket, c, ServiceTicketCheckFlags_);
+        if (NeedSrcChecker_ && res) {
+            NRoles::TRolesPtr roles = Updater_->GetRoles();
+            return TSrcChecker::Check(std::move(res), roles);
+        }
+        return res;
+    }
+
+    TCheckedUserTicket TTvmClient::CheckUserTicket(TStringBuf ticket, TMaybe<EBlackboxEnv> overridenEnv) const {
+        Y_ENSURE_EX(NeedUser_, TBrokenTvmClientSettings()
+                                   << "Need to use TClientSettings::EnableUserTicketChecking()");
+
+        auto c = Updater_->GetCachedUserContext(overridenEnv);
+        TCheckedUserTicket res = TUserTicketChecker::Check(ticket, c);
+        if (NeedDefaultUidChecker_ && res) {
+            NRoles::TRolesPtr roles = Updater_->GetRoles();
+            return TDefaultUidChecker::Check(std::move(res), roles);
+        }
+        return res;
+    }
+
+    NRoles::TRolesPtr TTvmClient::GetRoles() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetRoles();
+    }
+}
diff --git a/library/cpp/tvmauth/client/facade.h b/library/cpp/tvmauth/client/facade.h
new file mode 100644
index 0000000000..fa459a0b55
--- /dev/null
+++ b/library/cpp/tvmauth/client/facade.h
@@ -0,0 +1,124 @@
+#pragma once
+
+#include "misc/async_updater.h"
+#include "misc/api/settings.h"
+#include "misc/tool/settings.h"
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+
+namespace NTvmAuth::NInternal {
+    class TClientCaningKnife;
+}
+
+namespace NTvmAuth {
+    class TDefaultUidChecker;
+    class TServiceTicketGetter;
+    class TServiceTicketChecker;
+    class TSrcChecker;
+    class TUserTicketChecker;
+
+    /*!
+     * Long lived thread-safe object for interacting with TVM.
+     * In 99% cases TvmClient shoud be created at service startup and live for the whole process lifetime.
+     */
+    class TTvmClient {
+    public:
+        /*!
+         * Uses local http-interface to get state: http://localhost/tvm/.
+         * This interface can be provided with tvmtool (local daemon) or Qloud/YP (local http api in container).
+         * See more: https://wiki.yandex-team.ru/passport/tvm2/tvm-daemon/.
+         *
+         * Starts thread for updating of in-memory cache in background
+         * @param settings
+         * @param logger is usefull for monitoring and debuging
+         */
+        TTvmClient(const NTvmTool::TClientSettings& settings, TLoggerPtr logger);
+
+        /*!
+         * Uses general way to get state: https://tvm-api.yandex.net.
+         * It is not recomended for Qloud/YP.
+         *
+         * Starts thread for updating of in-memory cache in background
+         * Reads cache from disk if specified
+         * @param settings
+         * @param logger is usefull for monitoring and debuging
+         */
+        TTvmClient(const NTvmApi::TClientSettings& settings, TLoggerPtr logger);
+
+        /*!
+         * Feel free to use custom updating logic in tests
+         */
+        TTvmClient(
+            TAsyncUpdaterPtr updater,
+            const TServiceContext::TCheckFlags& serviceTicketCheckFlags = {});
+
+        TTvmClient(TTvmClient&&);
+        ~TTvmClient();
+        TTvmClient& operator=(TTvmClient&&);
+
+        /*!
+         * You should trigger your monitoring if status is not Ok.
+         * It will be unable to operate if status is Error.
+         * Description: https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/README.md#high-level-interface
+         * @return Current status of client.
+         */
+        TClientStatus GetStatus() const;
+
+        /*!
+         * Some tools for monitoring
+         */
+
+        TInstant GetUpdateTimeOfPublicKeys() const;
+        TInstant GetUpdateTimeOfServiceTickets() const;
+        TInstant GetInvalidationTimeOfPublicKeys() const;
+        TInstant GetInvalidationTimeOfServiceTickets() const;
+
+        /*!
+         * Requires fetchinig options (from TClientSettings or Qloud/YP/tvmtool settings)
+         * Can throw exception if cache is invalid or wrong config
+         *
+         * Alias is local label for TvmID
+         *  which can be used to avoid this number in every checking case in code.
+         * @param dst
+         */
+        TString GetServiceTicketFor(const TClientSettings::TAlias& dst) const;
+        TString GetServiceTicketFor(const TTvmId dst) const;
+
+        /*!
+         * For TTvmApi::TClientSettings: checking must be enabled in TClientSettings
+         * Can throw exception if checking was not enabled in settings
+         *
+         * ServiceTicket contains src: you should check it by yourself with ACL
+         * @param ticket
+         */
+        TCheckedServiceTicket CheckServiceTicket(TStringBuf ticket) const;
+
+        /*!
+         * Requires blackbox enviroment (from TClientSettings or Qloud/YP/tvmtool settings)
+         * Can throw exception if checking was not enabled in settings
+         * @param ticket
+         * @param overrideEnv allowes you to override env from settings
+         */
+        TCheckedUserTicket CheckUserTicket(TStringBuf ticket, TMaybe<EBlackboxEnv> overrideEnv = {}) const;
+
+        /*!
+         * Under construction now. It is unusable.
+         * PASSP-30283
+         */
+        NRoles::TRolesPtr GetRoles() const;
+
+    private:
+        TAsyncUpdaterPtr Updater_;
+
+        TServiceContext::TCheckFlags ServiceTicketCheckFlags_;
+
+        bool NeedService_ = false;
+        bool NeedUser_ = false;
+        bool NeedTickets_ = false;
+        bool NeedSrcChecker_ = false;
+        bool NeedDefaultUidChecker_ = false;
+
+        friend class NInternal::TClientCaningKnife;
+    };
+}
diff --git a/library/cpp/tvmauth/client/logger.cpp b/library/cpp/tvmauth/client/logger.cpp
new file mode 100644
index 0000000000..bd63773cdf
--- /dev/null
+++ b/library/cpp/tvmauth/client/logger.cpp
@@ -0,0 +1,12 @@
+#include "logger.h"
+
+#include <util/datetime/base.h>
+#include <util/generic/string.h>
+
+namespace NTvmAuth {
+    void TCerrLogger::Log(int lvl, const TString& msg) {
+        if (lvl > Level_)
+            return;
+        Cerr << TInstant::Now().ToStringLocal() << " lvl=" << lvl << " msg: " << msg << "\n";
+    }
+}
diff --git a/library/cpp/tvmauth/client/logger.h b/library/cpp/tvmauth/client/logger.h
new file mode 100644
index 0000000000..6f3718a2aa
--- /dev/null
+++ b/library/cpp/tvmauth/client/logger.h
@@ -0,0 +1,59 @@
+#pragma once
+
+#include <util/generic/ptr.h>
+
+namespace NTvmAuth {
+    class ILogger: public TAtomicRefCount<ILogger> {
+    public:
+        virtual ~ILogger() = default;
+
+        void Debug(const TString& msg) {
+            Log(7, msg);
+        }
+
+        void Info(const TString& msg) {
+            Log(6, msg);
+        }
+
+        void Warning(const TString& msg) {
+            Log(4, msg);
+        }
+
+        void Error(const TString& msg) {
+            Log(3, msg);
+        }
+
+    protected:
+        /*!
+         * Log event
+         * @param lvl is syslog level: 0(Emergency) ... 7(Debug)
+         * @param msg
+         */
+        virtual void Log(int lvl, const TString& msg) = 0;
+    };
+
+    class TCerrLogger: public ILogger {
+    public:
+        TCerrLogger(int level)
+            : Level_(level)
+        {
+        }
+
+        void Log(int lvl, const TString& msg) override;
+
+    private:
+        const int Level_;
+    };
+
+    using TLoggerPtr = TIntrusivePtr<ILogger>;
+
+    class TDevNullLogger: public ILogger {
+    public:
+        static TLoggerPtr IAmBrave() {
+            return MakeIntrusive<TDevNullLogger>();
+        }
+
+        void Log(int, const TString&) override {
+        }
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.cpp b/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.cpp
new file mode 100644
index 0000000000..cd6ec45406
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.cpp
@@ -0,0 +1,166 @@
+#include "tvm_client.h"
+
+#include <util/string/builder.h>
+
+namespace NTvmAuth::NDynamicClient {
+    TIntrusivePtr<TTvmClient> TTvmClient::Create(const NTvmApi::TClientSettings& settings, TLoggerPtr logger) {
+        Y_ENSURE_EX(logger, TNonRetriableException() << "Logger is required");
+        THolder<TTvmClient> p(new TTvmClient(settings, std::move(logger)));
+        p->Init();
+        p->StartWorker();
+        return p.Release();
+    }
+
+    NThreading::TFuture<TAddResponse> TTvmClient::Add(TDsts&& dsts) {
+        if (dsts.empty()) {
+            LogDebug("Adding dst: got empty task");
+            return NThreading::MakeFuture<TAddResponse>(TAddResponse{});
+        }
+
+        NThreading::TPromise<TAddResponse> promise = NThreading::NewPromise<TAddResponse>();
+
+        TServiceTickets::TMapIdStr requestedTicketsFromStartUpCache = GetRequestedTicketsFromStartUpCache(dsts);
+
+        if (requestedTicketsFromStartUpCache.size() == dsts.size() &&
+            !IsInvalid(TServiceTickets::GetInvalidationTime(requestedTicketsFromStartUpCache), TInstant::Now())) {
+            std::unique_lock lock(*ServiceTicketBatchUpdateMutex_);
+
+            TPairTicketsErrors newCache;
+            TServiceTicketsPtr cache = GetCachedServiceTickets();
+
+            NTvmApi::TDstSetPtr oldDsts = GetDsts();
+            std::shared_ptr<TDsts> newDsts = std::make_shared<TDsts>(oldDsts->begin(), oldDsts->end());
+
+            for (const auto& ticket : cache->TicketsById) {
+                newCache.Tickets.insert(ticket);
+            }
+            for (const auto& error : cache->ErrorsById) {
+                newCache.Errors.insert(error);
+            }
+            for (const auto& ticket : requestedTicketsFromStartUpCache) {
+                newCache.Tickets.insert(ticket);
+                newDsts->insert(ticket.first);
+            }
+
+            UpdateServiceTicketsCache(std::move(newCache), GetStartUpCacheBornDate());
+            SetDsts(std::move(newDsts));
+
+            lock.unlock();
+
+            TAddResponse response;
+
+            for (const auto& dst : dsts) {
+                response.emplace(dst, TDstResponse{EDstStatus::Success, TString()});
+                LogDebug(TStringBuilder() << "Got ticket from disk cache"
+                                          << ": dst=" << dst.Id << " got ticket");
+            }
+
+            promise.SetValue(std::move(response));
+            return promise.GetFuture();
+        }
+
+        const size_t size = dsts.size();
+        const ui64 id = ++TaskIds_;
+
+        TaskQueue_.Enqueue(TTask{id, promise, std::move(dsts)});
+
+        LogDebug(TStringBuilder() << "Adding dst: got task #" << id << " with " << size << " dsts");
+        return promise.GetFuture();
+    }
+
+    std::optional<TString> TTvmClient::GetOptionalServiceTicketFor(const TTvmId dst) {
+        TServiceTicketsPtr tickets = GetCachedServiceTickets();
+
+        Y_ENSURE_EX(tickets,
+                    TBrokenTvmClientSettings()
+                        << "Need to enable fetching of service tickets in settings");
+
+        auto it = tickets->TicketsById.find(dst);
+        if (it != tickets->TicketsById.end()) {
+            return it->second;
+        }
+
+        it = tickets->ErrorsById.find(dst);
+        if (it != tickets->ErrorsById.end()) {
+            ythrow TMissingServiceTicket()
+                << "Failed to get ticket for '" << dst << "': "
+                << it->second;
+        }
+
+        return {};
+    }
+
+    TTvmClient::TTvmClient(const NTvmApi::TClientSettings& settings, TLoggerPtr logger)
+        : TBase(settings, logger)
+    {
+    }
+
+    TTvmClient::~TTvmClient() {
+        TBase::StopWorker();
+    }
+
+    void TTvmClient::Worker() {
+        TBase::Worker();
+        ProcessTasks();
+    }
+
+    void TTvmClient::ProcessTasks() {
+        TaskQueue_.DequeueAll(&Tasks_);
+        if (Tasks_.empty()) {
+            return;
+        }
+
+        TDsts required;
+        for (const TTask& task : Tasks_) {
+            for (const auto& dst : task.Dsts) {
+                required.insert(dst);
+            }
+        }
+
+        TServiceTicketsPtr cache = UpdateMissingServiceTickets(required);
+        for (TTask& task : Tasks_) {
+            try {
+                SetResponseForTask(task, *cache);
+            } catch (const std::exception& e) {
+                LogError(TStringBuilder()
+                         << "Adding dst: task #" << task.Id << ": exception: " << e.what());
+            } catch (...) {
+                LogError(TStringBuilder()
+                         << "Adding dst: task #" << task.Id << ": exception: " << CurrentExceptionMessage());
+            }
+        }
+
+        Tasks_.clear();
+    }
+
+    static const TString UNKNOWN = "Unknown reason";
+    void TTvmClient::SetResponseForTask(TTvmClient::TTask& task, const TServiceTickets& cache) {
+        if (task.Promise.HasValue()) {
+            LogWarning(TStringBuilder() << "Adding dst: task #" << task.Id << " already has value");
+            return;
+        }
+
+        TAddResponse response;
+
+        for (const auto& dst : task.Dsts) {
+            if (cache.TicketsById.contains(dst.Id)) {
+                response.emplace(dst, TDstResponse{EDstStatus::Success, TString()});
+
+                LogDebug(TStringBuilder() << "Adding dst: task #" << task.Id
+                                          << ": dst=" << dst.Id << " got ticket");
+                continue;
+            }
+
+            auto it = cache.ErrorsById.find(dst.Id);
+            const TString& error = it == cache.ErrorsById.end() ? UNKNOWN : it->second;
+            response.emplace(dst, TDstResponse{EDstStatus::Fail, error});
+
+            LogWarning(TStringBuilder() << "Adding dst: task #" << task.Id
+                                        << ": dst=" << dst.Id
+                                        << " failed to get ticket: " << error);
+        }
+
+        LogDebug(TStringBuilder() << "Adding dst: task #" << task.Id << ": set value");
+        task.Promise.SetValue(std::move(response));
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.h b/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.h
new file mode 100644
index 0000000000..67eeb2618a
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.h
@@ -0,0 +1,60 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/misc/api/threaded_updater.h>
+
+#include <library/cpp/threading/future/future.h>
+
+#include <util/generic/map.h>
+#include <util/thread/lfqueue.h>
+
+#include <optional>
+
+namespace NTvmAuth::NDynamicClient {
+    enum class EDstStatus {
+        Success,
+        Fail,
+    };
+
+    struct TDstResponse {
+        EDstStatus Status = EDstStatus::Fail;
+        TString Error;
+
+        bool operator==(const TDstResponse& o) const {
+            return Status == o.Status && Error == o.Error;
+        }
+    };
+
+    using TDsts = NTvmApi::TDstSet;
+    using TAddResponse = TMap<NTvmApi::TClientSettings::TDst, TDstResponse>;
+
+    class TTvmClient: public NTvmApi::TThreadedUpdater {
+    public:
+        static TIntrusivePtr<TTvmClient> Create(const NTvmApi::TClientSettings& settings, TLoggerPtr logger);
+        virtual ~TTvmClient();
+
+        NThreading::TFuture<TAddResponse> Add(TDsts&& dsts);
+        std::optional<TString> GetOptionalServiceTicketFor(const TTvmId dst);
+
+    protected: // for tests
+        struct TTask {
+            ui64 Id = 0;
+            NThreading::TPromise<TAddResponse> Promise;
+            TDsts Dsts;
+        };
+
+        using TBase = NTvmApi::TThreadedUpdater;
+
+    protected: // for tests
+        TTvmClient(const NTvmApi::TClientSettings& settings, TLoggerPtr logger);
+
+        void Worker() override;
+        void ProcessTasks();
+
+        void SetResponseForTask(TTask& task, const TServiceTickets& cache);
+
+    private:
+        std::atomic<ui64> TaskIds_ = {0};
+        TLockFreeQueue<TTask> TaskQueue_;
+        TVector<TTask> Tasks_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/api/dynamic_dst/ut/tvm_client_ut.cpp b/library/cpp/tvmauth/client/misc/api/dynamic_dst/ut/tvm_client_ut.cpp
new file mode 100644
index 0000000000..c633b2457a
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/dynamic_dst/ut/tvm_client_ut.cpp
@@ -0,0 +1,760 @@
+#include <library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.h>
+
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/stream/file.h>
+#include <util/system/fs.h>
+
+#include <regex>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NDynamicClient;
+
+Y_UNIT_TEST_SUITE(DynamicClient) {
+    static const std::regex TIME_REGEX(R"(\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d.\d{6}Z)");
+    static const TString CACHE_DIR = "./tmp/";
+
+    static void WriteFile(TString name, TStringBuf body, TInstant time) {
+        NFs::Remove(CACHE_DIR + name);
+        TFileOutput f(CACHE_DIR + name);
+        f << TDiskWriter::PrepareData(time, body);
+    }
+
+    static void CleanCache() {
+        NFs::RemoveRecursive(CACHE_DIR);
+        NFs::MakeDirectoryRecursive(CACHE_DIR);
+    }
+
+    class TLogger: public NTvmAuth::ILogger {
+    public:
+        void Log(int lvl, const TString& msg) override {
+            Cout << TInstant::Now() << " lvl=" << lvl << " msg: " << msg << "\n";
+            Stream << lvl << ": " << msg << Endl;
+        }
+
+        TStringStream Stream;
+    };
+
+    class TOfflineUpdater: public NDynamicClient::TTvmClient {
+    public:
+        TOfflineUpdater(const NTvmApi::TClientSettings& settings,
+                        TIntrusivePtr<TLogger> l,
+                        bool fail = true,
+                        std::vector<TString> tickets = {})
+            : TTvmClient(settings, l)
+            , Fail(fail)
+            , Tickets(std::move(tickets))
+        {
+            Init();
+            ExpBackoff_.SetEnabled(false);
+        }
+
+        NUtils::TFetchResult FetchServiceTicketsFromHttp(const TString& req) const override {
+            if (Fail) {
+                throw yexception() << "tickets: alarm";
+            }
+
+            TString response;
+            if (!Tickets.empty()) {
+                response = Tickets.front();
+                Tickets.erase(Tickets.begin());
+            }
+
+            Cout << "*** FetchServiceTicketsFromHttp. request: " << req << ". response: " << response << Endl;
+            return {200, {}, "/2/ticket", response, ""};
+        }
+
+        NUtils::TFetchResult FetchPublicKeysFromHttp() const override {
+            if (Fail) {
+                throw yexception() << "keysalarm";
+            }
+            Cout << "*** FetchPublicKeysFromHttp" << Endl;
+            return {200, {}, "/2/keys", PublicKeys, ""};
+        }
+
+        using TTvmClient::GetDsts;
+        using TTvmClient::ProcessTasks;
+        using TTvmClient::SetResponseForTask;
+        using TTvmClient::Worker;
+
+        bool Fail = true;
+        TString PublicKeys = NUnittest::TVMKNIFE_PUBLIC_KEYS;
+        mutable std::vector<TString> Tickets;
+    };
+
+    Y_UNIT_TEST(StartWithIncompleteTicketsSet) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"kolmo", 213}},
+            .IsIncompleteTicketsSetAnError = false,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+
+        {
+            TOfflineUpdater client(s,
+                                   l,
+                                   false,
+                                   {
+                                       R"({"213"  : { "error" : "some error"}})",
+                                       R"({"123"  : { "ticket" : "service_ticket_3"}})",
+                                   });
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(213));
+
+            NThreading::TFuture<TAddResponse> fut = client.Add({123});
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut.HasValue());
+            TAddResponse resp{
+                {123, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp, fut.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, *client.GetDsts());
+
+            UNIT_ASSERT_EXCEPTION_CONTAINS(client.GetOptionalServiceTicketFor(213), TMissingServiceTicket, "some error");
+        }
+    }
+
+    Y_UNIT_TEST(StartWithEmptyTicketsSet) {
+        CleanCache();
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"kolmo", 213}},
+            .IsIncompleteTicketsSetAnError = false,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+
+        {
+            TOfflineUpdater client(s,
+                                   l,
+                                   false,
+                                   {
+                                       R"({"213"  : { "error" : "some error"}})",
+                                       R"({"123"  : { "ticket" : "3:serv:CBAQ__________9_IgYIlJEGEHs:CcafYQH-FF5XaXMuJrgLZj98bIC54cs1ZkcFS9VV_9YM9iOM_0PXCtMkdg85rFjxE_BMpg7bE8ZuoqNfdw0FPt0BAKNeISwlydj4o0IjY82--LZBpP8CRn-EpAnkRaDShdlfrcF2pk1SSmEX8xdyZVQEnkUPY0cHGlFnu231vnE"}})",
+                                   });
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT_EXCEPTION_CONTAINS(client.GetOptionalServiceTicketFor(213), TMissingServiceTicket, "some error");
+
+            NThreading::TFuture<TAddResponse> fut = client.Add({123});
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut.HasValue());
+            TAddResponse resp{
+                {123, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp, fut.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, *client.GetDsts());
+
+            UNIT_ASSERT_EXCEPTION_CONTAINS(client.GetOptionalServiceTicketFor(213), TMissingServiceTicket, "some error");
+        }
+    };
+    Y_UNIT_TEST(StartWithIncompleteCacheAndAdd) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"kolmo", 213}},
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry: ServiceTickets: tickets: alarm");
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "4: Failed to get ServiceTickets: tickets: alarm\n"
+                << "4: Failed to get ServiceTickets: tickets: alarm\n"
+                << "4: Failed to get ServiceTickets: tickets: alarm\n"
+                << "4: Failed to update service tickets: tickets: alarm\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+        l->Stream.Str().clear();
+
+        {
+            TOfflineUpdater client(s,
+                                   l,
+                                   false,
+                                   {
+                                       R"({"213" : { "ticket" : "service_ticket_2"}})",
+                                       R"({"123"  : { "ticket" : "service_ticket_3"}})",
+                                   });
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+
+            NThreading::TFuture<TAddResponse> fut = client.Add({123});
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut.HasValue());
+            TAddResponse resp{
+                {123, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp, fut.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, *client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 1 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 1 destination(s)\n"
+                << "6: Cache was partly updated with 1 service ticket(s). total: 2\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: got task #1 with 1 dsts\n"
+                << "7: Response with service tickets for 1 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 1 destination(s)\n"
+                << "6: Cache was partly updated with 1 service ticket(s). total: 3\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: set value\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithCacheAndAdd) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+            .IsIncompleteTicketsSetAnError = false,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater client(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+
+            client.Fail = false;
+            client.Tickets = {
+                R"({"123"  : { "ticket" : "service_ticket_3"}, "213" : { "ticket" : "service_ticket_2"}})",
+            };
+            NThreading::TFuture<TAddResponse> fut = client.Add({123, 213});
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut.HasValue());
+            TAddResponse resp{
+                {123, {EDstStatus::Success, ""}},
+                {213, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp, fut.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, *client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Adding dst: got task #1 with 2 dsts\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was partly updated with 2 service ticket(s). total: 3\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: dst=213 got ticket\n"
+                << "7: Adding dst: task #1: set value\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithCacheAndAddSeveral) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater client(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+
+            client.Fail = false;
+            client.Tickets = {
+                R"({"123"  : { "ticket" : "service_ticket_3"}, "213" : { "ticket" : "service_ticket_2"}})",
+            };
+            NThreading::TFuture<TAddResponse> fut1 = client.Add({123});
+            NThreading::TFuture<TAddResponse> fut2 = client.Add({213});
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut1.HasValue());
+            TAddResponse resp1{
+                {123, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp1, fut1.GetValue());
+
+            UNIT_ASSERT(fut2.HasValue());
+            TAddResponse resp2{
+                {213, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp2, fut2.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, *client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Adding dst: got task #1 with 1 dsts\n"
+                << "7: Adding dst: got task #2 with 1 dsts\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was partly updated with 2 service ticket(s). total: 3\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: set value\n"
+                << "7: Adding dst: task #2: dst=213 got ticket\n"
+                << "7: Adding dst: task #2: set value\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithCacheAndAddSeveralWithErrors) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater client(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+
+            UNIT_ASSERT(client.GetOptionalServiceTicketFor(19));
+            UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIKhCUkQY:CX",
+                                     *client.GetOptionalServiceTicketFor(19));
+            UNIT_ASSERT(!client.GetOptionalServiceTicketFor(456));
+
+            client.Fail = false;
+            client.Tickets = {
+                R"({
+                    "123"  : { "ticket" : "service_ticket_3"},
+                    "213" : { "ticket" : "service_ticket_2"},
+                    "456"  : { "error" : "error_3"}
+                })",
+            };
+            NThreading::TFuture<TAddResponse> fut1 = client.Add({123, 213});
+            NThreading::TFuture<TAddResponse> fut2 = client.Add({213, 456});
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(456));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(456));
+
+            UNIT_ASSERT(client.GetOptionalServiceTicketFor(19));
+            UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIKhCUkQY:CX",
+                                     *client.GetOptionalServiceTicketFor(19));
+            UNIT_ASSERT_EXCEPTION_CONTAINS(client.GetOptionalServiceTicketFor(456),
+                                           TMissingServiceTicket,
+                                           "Failed to get ticket for '456': error_3");
+
+            UNIT_ASSERT(fut1.HasValue());
+            TAddResponse resp1{
+                {123, {EDstStatus::Success, ""}},
+                {213, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp1, fut1.GetValue());
+
+            UNIT_ASSERT(fut2.HasValue());
+            TAddResponse resp2{
+                {213, {EDstStatus::Success, ""}},
+                {456, {EDstStatus::Fail, "error_3"}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp2, fut2.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, *client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Adding dst: got task #1 with 2 dsts\n"
+                << "7: Adding dst: got task #2 with 2 dsts\n"
+                << "7: Response with service tickets for 3 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 3 destination(s)\n"
+                << "3: Failed to get service ticket for dst=456: error_3\n"
+                << "6: Cache was partly updated with 2 service ticket(s). total: 3\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: dst=213 got ticket\n"
+                << "7: Adding dst: task #1: set value\n"
+                << "7: Adding dst: task #2: dst=213 got ticket\n"
+                << "4: Adding dst: task #2: dst=456 failed to get ticket: error_3\n"
+                << "7: Adding dst: task #2: set value\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(WithException) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater client(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+
+            client.Fail = false;
+            client.Tickets = {
+                R"({
+                    "123"  : { "ticket" : "service_ticket_3"},
+                    "213" : { "ticket" : "service_ticket_2"},
+                    "456"  : { "error" : "error_3"},
+                    "789" : { "ticket" : "service_ticket_4"}
+                })",
+            };
+            NThreading::TFuture<TAddResponse> fut1 = client.Add({123, 213});
+            NThreading::TFuture<TAddResponse> fut2 = client.Add({213, 456});
+            NThreading::TFuture<TAddResponse> fut3 = client.Add({789});
+
+            fut2.Subscribe([](const auto&) {
+                throw yexception() << "planed exc";
+            });
+            fut3.Subscribe([](const auto&) {
+                throw 5;
+            });
+
+            UNIT_ASSERT_NO_EXCEPTION(client.Worker());
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(456));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(456));
+
+            UNIT_ASSERT(fut1.HasValue());
+            TAddResponse resp1{
+                {123, {EDstStatus::Success, ""}},
+                {213, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp1, fut1.GetValue());
+
+            UNIT_ASSERT(fut2.HasValue());
+            TAddResponse resp2{
+                {213, {EDstStatus::Success, ""}},
+                {456, {EDstStatus::Fail, "error_3"}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp2, fut2.GetValue());
+
+            UNIT_ASSERT(fut3.HasValue());
+            TAddResponse resp3{
+                {789, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp3, fut3.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213, 789};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, *client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Adding dst: got task #1 with 2 dsts\n"
+                << "7: Adding dst: got task #2 with 2 dsts\n"
+                << "7: Adding dst: got task #3 with 1 dsts\n"
+                << "7: Response with service tickets for 4 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 4 destination(s)\n"
+                << "3: Failed to get service ticket for dst=456: error_3\n"
+                << "6: Cache was partly updated with 3 service ticket(s). total: 4\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: dst=213 got ticket\n"
+                << "7: Adding dst: task #1: set value\n"
+                << "7: Adding dst: task #2: dst=213 got ticket\n"
+                << "4: Adding dst: task #2: dst=456 failed to get ticket: error_3\n"
+                << "7: Adding dst: task #2: set value\n"
+                << "3: Adding dst: task #2: exception: planed exc\n"
+                << "7: Adding dst: task #3: dst=789 got ticket\n"
+                << "7: Adding dst: task #3: set value\n"
+                << "3: Adding dst: task #3: exception: unknown error\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(UseCacheOnAddAfterRestart) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+            .IsIncompleteTicketsSetAnError = false,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater client(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+
+            client.Fail = false;
+            client.Tickets = {
+                R"({"123"  : { "ticket" : "3:serv:CBAQ__________9_IgQIExB7:V9zPxvEi-VYK2FffYkkT0lF_Ol2XXGzZDH-dVpx0Vo962KDh6n3AtPiCGpYZsLFZkJ5BcujVOUVfONprbm9WqZaPk6qDRuBd-OfYjGRDNUGAP_v5a1bZEBZhaRV8pvceh28E5QsgpOz1SEN5viKgPt1Tz9EmN8abQZiCPj2mqY8"},
+                "213" : { "ticket" : "3:serv:CBAQ__________9_IgUIExDVAQ:Ten8XGEC1rupV9GsKvEG9IbN5DazwS3rmpEuFbgk34RaNeLO9g1mAvxKhL76hQnrgi_KjXv_xEtyQ4awBTXeQuhSlC0wkgargsc96AShWBFfHuTM-ftDtn5VdF9d8k1TEsTdJfZsW3_E_wy_3FQhs_rnoIowys6_SAh8YLpqaQk"}})",
+            };
+            NThreading::TFuture<TAddResponse> fut = client.Add({123, 213});
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut.HasValue());
+            TAddResponse resp{
+                {123, {EDstStatus::Success, ""}},
+                {213, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp, fut.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, *client.GetDsts());
+        }
+        {
+            TOfflineUpdater client(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(213));
+
+            NThreading::TFuture<TAddResponse> fut = client.Add({123, 213});
+            fut.Wait();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut.HasValue());
+            TAddResponse resp{
+                {123, {EDstStatus::Success, ""}},
+                {213, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp, fut.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, *client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Adding dst: got task #1 with 2 dsts\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was partly updated with 2 service ticket(s). total: 3\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: dst=213 got ticket\n"
+                << "7: Adding dst: task #1: set value\n"
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 3 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "6: Cache was updated with 3 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: Got ticket from disk cache: dst=123 got ticket\n"
+                << "7: Got ticket from disk cache: dst=213 got ticket\n",
+            l->Stream.Str());
+    }
+}
+
+template <>
+void Out<NTvmAuth::NDynamicClient::TDstResponse>(IOutputStream& out, const NTvmAuth::NDynamicClient::TDstResponse& m) {
+    out << m.Status << " (" << m.Error << ")";
+}
+
+template <>
+void Out<NTvmAuth::NTvmApi::TClientSettings::TDst>(IOutputStream& out, const NTvmAuth::NTvmApi::TClientSettings::TDst& m) {
+    out << m.Id;
+}
diff --git a/library/cpp/tvmauth/client/misc/api/retry_settings.h b/library/cpp/tvmauth/client/misc/api/retry_settings.h
new file mode 100644
index 0000000000..607b230811
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/retry_settings.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/misc/exponential_backoff.h>
+
+namespace NTvmAuth::NTvmApi {
+    struct TRetrySettings {
+        TExponentialBackoff::TSettings BackoffSettings = {
+            TDuration::Seconds(0),
+            TDuration::Minutes(1),
+            2,
+            0.5,
+        };
+        TDuration MaxRandomSleepDefault = TDuration::Seconds(5);
+        TDuration MaxRandomSleepWhenOk = TDuration::Minutes(1);
+        ui32 RetriesOnStart = 3;
+        ui32 RetriesInBackground = 2;
+        TDuration WorkerAwakingPeriod = TDuration::Seconds(10);
+        ui32 DstsLimit = 300;
+        TDuration RolesUpdatePeriod = TDuration::Minutes(10);
+        TDuration RolesWarnPeriod = TDuration::Minutes(20);
+
+        bool operator==(const TRetrySettings& o) const {
+            return BackoffSettings == o.BackoffSettings &&
+                   MaxRandomSleepDefault == o.MaxRandomSleepDefault &&
+                   MaxRandomSleepWhenOk == o.MaxRandomSleepWhenOk &&
+                   RetriesOnStart == o.RetriesOnStart &&
+                   WorkerAwakingPeriod == o.WorkerAwakingPeriod &&
+                   DstsLimit == o.DstsLimit &&
+                   RolesUpdatePeriod == o.RolesUpdatePeriod &&
+                   RolesWarnPeriod == o.RolesWarnPeriod;
+        }
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/api/roles_fetcher.cpp b/library/cpp/tvmauth/client/misc/api/roles_fetcher.cpp
new file mode 100644
index 0000000000..8f4b359e8c
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/roles_fetcher.cpp
@@ -0,0 +1,164 @@
+#include "roles_fetcher.h"
+
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+#include <library/cpp/tvmauth/client/misc/roles/decoder.h>
+#include <library/cpp/tvmauth/client/misc/roles/parser.h>
+
+#include <library/cpp/http/misc/httpcodes.h>
+#include <library/cpp/string_utils/quote/quote.h>
+
+#include <util/string/builder.h>
+#include <util/string/join.h>
+
+namespace NTvmAuth::NTvmApi {
+    static TString CreatePath(const TString& dir, const TString& file) {
+        return dir.EndsWith("/")
+                   ? dir + file
+                   : dir + "/" + file;
+    }
+
+    TRolesFetcher::TRolesFetcher(const TRolesFetcherSettings& settings, TLoggerPtr logger)
+        : Settings_(settings)
+        , Logger_(logger)
+        , CacheFilePath_(CreatePath(Settings_.CacheDir, "roles"))
+    {
+        Client_ = std::make_unique<TKeepAliveHttpClient>(
+            Settings_.TiroleHost,
+            Settings_.TirolePort,
+            Settings_.Timeout,
+            Settings_.Timeout);
+    }
+
+    TInstant TRolesFetcher::ReadFromDisk() {
+        TDiskReader dr(CacheFilePath_, Logger_.Get());
+        if (!dr.Read()) {
+            return {};
+        }
+
+        std::pair<TString, TString> data = ParseDiskFormat(dr.Data());
+        if (data.second != Settings_.IdmSystemSlug) {
+            Logger_->Warning(
+                TStringBuilder() << "Roles in disk cache are for another slug (" << data.second
+                                 << "). Self=" << Settings_.IdmSystemSlug);
+            return {};
+        }
+
+        CurrentRoles_.Set(NRoles::TParser::Parse(std::make_shared<TString>(std::move(data.first))));
+        Logger_->Debug(
+            TStringBuilder() << "Succeed to read roles with revision "
+                             << CurrentRoles_.Get()->GetMeta().Revision
+                             << " from " << CacheFilePath_);
+
+        return dr.Time();
+    }
+
+    bool TRolesFetcher::AreRolesOk() const {
+        return bool(GetCurrentRoles());
+    }
+
+    bool TRolesFetcher::IsTimeToUpdate(const TRetrySettings& settings, TDuration sinceUpdate) {
+        return settings.RolesUpdatePeriod < sinceUpdate;
+    }
+
+    bool TRolesFetcher::ShouldWarn(const TRetrySettings& settings, TDuration sinceUpdate) {
+        return settings.RolesWarnPeriod < sinceUpdate;
+    }
+
+    NUtils::TFetchResult TRolesFetcher::FetchActualRoles(const TString& serviceTicket) {
+        TStringStream out;
+        THttpHeaders outHeaders;
+
+        TRequest req = CreateTiroleRequest(serviceTicket);
+        TKeepAliveHttpClient::THttpCode code = Client_->DoGet(
+            req.Url,
+            &out,
+            req.Headers,
+            &outHeaders);
+
+        const THttpInputHeader* reqId = outHeaders.FindHeader("X-Request-Id");
+
+        Logger_->Debug(
+            TStringBuilder() << "Succeed to perform request for roles to " << Settings_.TiroleHost
+                             << " (request_id=" << (reqId ? reqId->Value() : "")
+                             << "). code=" << code);
+
+        return {code, std::move(outHeaders), "/v1/get_actual_roles", out.Str(), {}};
+    }
+
+    void TRolesFetcher::Update(NUtils::TFetchResult&& fetchResult, TInstant now) {
+        if (fetchResult.Code == HTTP_NOT_MODIFIED) {
+            Y_ENSURE(CurrentRoles_.Get(),
+                     "tirole did not return any roles because current roles are actual,"
+                     " but there are no roles in memory - this should never happen");
+            return;
+        }
+
+        Y_ENSURE(fetchResult.Code == HTTP_OK,
+                 "Unexpected code from tirole: " << fetchResult.Code << ". " << fetchResult.Response);
+
+        const THttpInputHeader* codec = fetchResult.Headers.FindHeader("X-Tirole-Compression");
+        const TStringBuf codecBuf = codec ? codec->Value() : "";
+
+        NRoles::TRawPtr blob;
+        try {
+            blob = std::make_shared<TString>(NRoles::TDecoder::Decode(
+                codecBuf,
+                std::move(fetchResult.Response)));
+        } catch (const std::exception& e) {
+            throw yexception() << "Failed to decode blob with codec '" << codecBuf
+                               << "': " << e.what();
+        }
+
+        CurrentRoles_.Set(NRoles::TParser::Parse(blob));
+
+        Logger_->Debug(
+            TStringBuilder() << "Succeed to update roles with revision "
+                             << CurrentRoles_.Get()->GetMeta().Revision);
+
+        TDiskWriter dw(CacheFilePath_, Logger_.Get());
+        dw.Write(PrepareDiskFormat(*blob, Settings_.IdmSystemSlug), now);
+    }
+
+    NTvmAuth::NRoles::TRolesPtr TRolesFetcher::GetCurrentRoles() const {
+        return CurrentRoles_.Get();
+    }
+
+    void TRolesFetcher::ResetConnection() {
+        Client_->ResetConnection();
+    }
+
+    static const char DELIMETER = '\t';
+
+    std::pair<TString, TString> TRolesFetcher::ParseDiskFormat(TStringBuf filebody) {
+        TStringBuf slug = filebody.RNextTok(DELIMETER);
+        return {TString(filebody), CGIUnescapeRet(slug)};
+    }
+
+    TString TRolesFetcher::PrepareDiskFormat(TStringBuf roles, TStringBuf slug) {
+        TStringStream res;
+        res.Reserve(roles.size() + 1 + slug.size());
+        res << roles << DELIMETER << CGIEscapeRet(slug);
+        return res.Str();
+    }
+
+    TRolesFetcher::TRequest TRolesFetcher::CreateTiroleRequest(const TString& serviceTicket) const {
+        TRolesFetcher::TRequest res;
+
+        TStringStream url;
+        url.Reserve(512);
+        url << "/v1/get_actual_roles?";
+        url << "system_slug=" << CGIEscapeRet(Settings_.IdmSystemSlug) << "&";
+        Settings_.ProcInfo.AddToRequest(url);
+        res.Url = std::move(url.Str());
+
+        res.Headers.reserve(2);
+        res.Headers.emplace(XYaServiceTicket_, serviceTicket);
+
+        NRoles::TRolesPtr roles = CurrentRoles_.Get();
+        if (roles) {
+            res.Headers.emplace(IfNoneMatch_, Join("", "\"", roles->GetMeta().Revision, "\""));
+        }
+
+        return res;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/api/roles_fetcher.h b/library/cpp/tvmauth/client/misc/api/roles_fetcher.h
new file mode 100644
index 0000000000..63691223b5
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/roles_fetcher.h
@@ -0,0 +1,63 @@
+#pragma once
+
+#include "retry_settings.h"
+
+#include <library/cpp/tvmauth/client/misc/fetch_result.h>
+#include <library/cpp/tvmauth/client/misc/proc_info.h>
+#include <library/cpp/tvmauth/client/misc/utils.h>
+#include <library/cpp/tvmauth/client/misc/roles/roles.h>
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/http/simple/http_client.h>
+
+namespace NTvmAuth::NTvmApi {
+    struct TRolesFetcherSettings {
+        TString TiroleHost;
+        ui16 TirolePort = 0;
+        TString CacheDir;
+        NUtils::TProcInfo ProcInfo;
+        TTvmId SelfTvmId = 0;
+        TString IdmSystemSlug;
+        TDuration Timeout = TDuration::Seconds(30);
+    };
+
+    class TRolesFetcher {
+    public:
+        TRolesFetcher(const TRolesFetcherSettings& settings, TLoggerPtr logger);
+
+        TInstant ReadFromDisk();
+
+        bool AreRolesOk() const;
+        static bool IsTimeToUpdate(const TRetrySettings& settings, TDuration sinceUpdate);
+        static bool ShouldWarn(const TRetrySettings& settings, TDuration sinceUpdate);
+
+        NUtils::TFetchResult FetchActualRoles(const TString& serviceTicket);
+        void Update(NUtils::TFetchResult&& fetchResult, TInstant now = TInstant::Now());
+
+        NTvmAuth::NRoles::TRolesPtr GetCurrentRoles() const;
+
+        void ResetConnection();
+
+    public:
+        static std::pair<TString, TString> ParseDiskFormat(TStringBuf filebody);
+        static TString PrepareDiskFormat(TStringBuf roles, TStringBuf slug);
+
+        struct TRequest {
+            TString Url;
+            TKeepAliveHttpClient::THeaders Headers;
+        };
+        TRequest CreateTiroleRequest(const TString& serviceTicket) const;
+
+    private:
+        const TRolesFetcherSettings Settings_;
+        const TLoggerPtr Logger_;
+        const TString CacheFilePath_;
+        const TString XYaServiceTicket_ = "X-Ya-Service-Ticket";
+        const TString IfNoneMatch_ = "If-None-Match";
+
+        NUtils::TProtectedValue<NTvmAuth::NRoles::TRolesPtr> CurrentRoles_;
+
+        std::unique_ptr<TKeepAliveHttpClient> Client_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/api/settings.cpp b/library/cpp/tvmauth/client/misc/api/settings.cpp
new file mode 100644
index 0000000000..eddad21869
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/settings.cpp
@@ -0,0 +1,89 @@
+#include "settings.h"
+
+#include <util/datetime/base.h>
+#include <util/stream/file.h>
+#include <util/system/fs.h>
+
+#include <set>
+
+namespace NTvmAuth::NTvmApi {
+    void TClientSettings::CheckPermissions(const TString& dir) {
+        const TString name = dir + "/check.tmp";
+
+        try {
+            NFs::EnsureExists(dir);
+
+            TFile file(name, CreateAlways | RdWr);
+
+            NFs::Remove(name);
+        } catch (const std::exception& e) {
+            NFs::Remove(name);
+            ythrow TPermissionDenied() << "Permission denied to disk cache directory: " << e.what();
+        }
+    }
+
+    void TClientSettings::CheckValid() const {
+        if (DiskCacheDir) {
+            CheckPermissions(DiskCacheDir);
+        }
+
+        if (TStringBuf(Secret)) {
+            Y_ENSURE_EX(NeedServiceTicketsFetching(),
+                        TBrokenTvmClientSettings() << "Secret is present but destinations list is empty. It makes no sense");
+        }
+        if (NeedServiceTicketsFetching()) {
+            Y_ENSURE_EX(SelfTvmId != 0,
+                        TBrokenTvmClientSettings() << "SelfTvmId cannot be 0 if fetching of Service Tickets required");
+            Y_ENSURE_EX((TStringBuf)Secret,
+                        TBrokenTvmClientSettings() << "Secret is required for fetching of Service Tickets");
+        }
+
+        if (CheckServiceTickets) {
+            Y_ENSURE_EX(SelfTvmId != 0,
+                        TBrokenTvmClientSettings() << "SelfTvmId cannot be 0 if checking of Service Tickets required");
+        }
+
+        if (FetchRolesForIdmSystemSlug) {
+            Y_ENSURE_EX(DiskCacheDir,
+                        TBrokenTvmClientSettings() << "Disk cache must be enabled to use roles: "
+                                                      "they can be heavy");
+        }
+
+        bool needSmth = NeedServiceTicketsFetching() ||
+                        CheckServiceTickets ||
+                        CheckUserTicketsWithBbEnv;
+        Y_ENSURE_EX(needSmth, TBrokenTvmClientSettings() << "Invalid settings: nothing to do");
+
+        // Useless now: keep it here to avoid forgetting check from TDst. TODO: PASSP-35377
+        for (const auto& dst : FetchServiceTicketsForDsts) {
+            Y_ENSURE_EX(dst.Id != 0, TBrokenTvmClientSettings() << "TvmId cannot be 0");
+        }
+        // TODO: check only FetchServiceTicketsForDsts_
+        // Python binding checks settings before normalization
+        for (const auto& [alias, dst] : FetchServiceTicketsForDstsWithAliases) {
+            Y_ENSURE_EX(dst.Id != 0, TBrokenTvmClientSettings() << "TvmId cannot be 0");
+        }
+        Y_ENSURE_EX(TiroleTvmId != 0, TBrokenTvmClientSettings() << "TiroleTvmId cannot be 0");
+    }
+
+    TClientSettings TClientSettings::CloneNormalized() const {
+        TClientSettings res = *this;
+
+        std::set<TTvmId> allDsts;
+        for (const auto& tvmid : res.FetchServiceTicketsForDsts) {
+            allDsts.insert(tvmid.Id);
+        }
+        for (const auto& [alias, tvmid] : res.FetchServiceTicketsForDstsWithAliases) {
+            allDsts.insert(tvmid.Id);
+        }
+        if (FetchRolesForIdmSystemSlug) {
+            allDsts.insert(res.TiroleTvmId);
+        }
+
+        res.FetchServiceTicketsForDsts = {allDsts.begin(), allDsts.end()};
+
+        res.CheckValid();
+
+        return res;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/api/settings.h b/library/cpp/tvmauth/client/misc/api/settings.h
new file mode 100644
index 0000000000..4f901dda57
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/settings.h
@@ -0,0 +1,236 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/misc/settings.h>
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+#include <library/cpp/tvmauth/type.h>
+
+#include <library/cpp/string_utils/secret_string/secret_string.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/hash.h>
+#include <util/generic/maybe.h>
+
+namespace NTvmAuth::NTvmApi {
+    /**
+     * Settings for TVM client. Uses https://tvm-api.yandex.net to get state.
+     * At least one of them is required:
+     *     FetchServiceTicketsForDsts_/FetchServiceTicketsForDstsWithAliases_
+     *     CheckServiceTickets_
+     *     CheckUserTicketsWithBbEnv_
+     */
+    class TClientSettings: public NTvmAuth::TClientSettings {
+    public:
+        class TDst;
+
+        /**
+         * Alias is an internal name for destinations within your code.
+         *  You can associate a name with an tvm_id once in your code and use the name as an alias for
+         *  tvm_id to each calling point. Useful for several environments: prod/test/etc.
+         * @example:
+         *      // init
+         *      static const TString MY_BACKEND = "my backend";
+         *      TDstMap map = {{MY_BACKEND, TDst(config.get("my_back_tvm_id"))}};
+         *      ...
+         *      // per request
+         *      TString t = tvmClient.GetServiceTicket(MY_BACKEND);
+         */
+        using TDstMap = THashMap<TAlias, TDst>;
+        using TDstVector = TVector<TDst>;
+
+    public:
+        /*!
+         * NOTE: Please use this option: it provides the best reliability
+         * NOTE: Client requires read/write permissions
+         * WARNING: The same directory can be used only:
+         *            - for TVM clients with the same settings
+         *          OR
+         *            - for new client replacing previous - with another config.
+         *          System user must be the same for processes with these clients inside.
+         *          Implementation doesn't provide other scenarios.
+         */
+        TString DiskCacheDir;
+
+        // Required for Service Ticket fetching or checking
+        TTvmId SelfTvmId = 0;
+
+        // Options for Service Tickets fetching
+        NSecretString::TSecretString Secret;
+        /*!
+         * Client will process both attrs:
+         *   FetchServiceTicketsForDsts_, FetchServiceTicketsForDstsWithAliases_
+         * WARNING: It is not way to provide authorization for incoming ServiceTickets!
+         *          It is way only to send your ServiceTickets to your backend!
+         */
+        TDstVector FetchServiceTicketsForDsts;
+        TDstMap FetchServiceTicketsForDstsWithAliases;
+        bool IsIncompleteTicketsSetAnError = true;
+
+        // Options for Service Tickets checking
+        bool CheckServiceTickets = false;
+
+        // Options for User Tickets checking
+        TMaybe<EBlackboxEnv> CheckUserTicketsWithBbEnv;
+
+        // Options for roles fetching
+        TString FetchRolesForIdmSystemSlug;
+        /*!
+         * By default client checks src from ServiceTicket or default uid from UserTicket -
+         *   to prevent you from forgetting to check it yourself.
+         * It does binary checks only:
+         *   ticket gets status NoRoles, if there is no role for src or default uid.
+         * You need to check roles on your own if you have a non-binary role system or
+         *     you have disabled ShouldCheckSrc/ShouldCheckDefaultUid
+         *
+         * You may need to disable this check in the following cases:
+         *   - You use GetRoles() to provide verbose message (with revision).
+         *     Double check may be inconsistent:
+         *       binary check inside client uses revision of roles X - i.e. src 100500 has no role,
+         *       exact check in your code uses revision of roles Y -  i.e. src 100500 has some roles.
+         */
+        bool ShouldCheckSrc = true;
+        bool ShouldCheckDefaultUid = true;
+        /*!
+         * By default client checks dst from ServiceTicket. If this check is switched off
+         *   incorrect dst does not result in error of checked ticket status
+         * DANGEROUS: This case you must check dst manualy using @link TCheckedServiceTicket::GetDst()
+         */
+        bool ShouldCheckDst = true;
+
+        // Options for tests
+        TString TvmHost = "https://tvm-api.yandex.net";
+        ui16 TvmPort = 443;
+        TString TiroleHost = "https://tirole-api.yandex.net";
+        TDuration TvmSocketTimeout = TDuration::Seconds(5);
+        TDuration TvmConnectTimeout = TDuration::Seconds(30);
+        ui16 TirolePort = 443;
+        TTvmId TiroleTvmId = TIROLE_TVMID;
+
+        // for debug purposes
+        TString LibVersionPrefix;
+
+        void CheckValid() const;
+        TClientSettings CloneNormalized() const;
+
+        static inline const TTvmId TIROLE_TVMID = 2028120;
+        static inline const TTvmId TIROLE_TVMID_TEST = 2026536;
+
+        // DEPRECATED API
+        // TODO: get rid of it: PASSP-35377
+    public:
+        // Deprecated: set attributes directly
+        void SetSelfTvmId(TTvmId selfTvmId) {
+            SelfTvmId = selfTvmId;
+        }
+
+        // Deprecated: set attributes directly
+        void EnableServiceTicketChecking() {
+            CheckServiceTickets = true;
+        }
+
+        // Deprecated: set attributes directly
+        void EnableUserTicketChecking(EBlackboxEnv env) {
+            CheckUserTicketsWithBbEnv = env;
+        }
+
+        // Deprecated: set attributes directly
+        void SetTvmHostPort(const TString& host, ui16 port) {
+            TvmHost = host;
+            TvmPort = port;
+        }
+
+        // Deprecated: set attributes directly
+        void SetTiroleHostPort(const TString& host, ui16 port) {
+            TiroleHost = host;
+            TirolePort = port;
+        }
+
+        // Deprecated: set attributes directly
+        void EnableRolesFetching(const TString& systemSlug, TTvmId tiroleTvmId = TIROLE_TVMID) {
+            TiroleTvmId = tiroleTvmId;
+            FetchRolesForIdmSystemSlug = systemSlug;
+        }
+
+        // Deprecated: set attributes directly
+        void DoNotCheckSrcByDefault() {
+            ShouldCheckSrc = false;
+        }
+
+        // Deprecated: set attributes directly
+        void DoNotCheckDefaultUidByDefault() {
+            ShouldCheckDefaultUid = false;
+        }
+
+        // Deprecated: set attributes directly
+        void SetDiskCacheDir(const TString& dir) {
+            DiskCacheDir = dir;
+        }
+
+        // Deprecated: set attributes directly
+        void EnableServiceTicketsFetchOptions(const TStringBuf selfSecret,
+                                              TDstMap&& dsts,
+                                              const bool considerIncompleteTicketsSetAsError = true) {
+            IsIncompleteTicketsSetAnError = considerIncompleteTicketsSetAsError;
+            Secret = selfSecret;
+
+            FetchServiceTicketsForDsts = TDstVector{};
+            FetchServiceTicketsForDsts.reserve(dsts.size());
+            for (const auto& pair : dsts) {
+                FetchServiceTicketsForDsts.push_back(pair.second);
+            }
+
+            FetchServiceTicketsForDstsWithAliases = std::move(dsts);
+        }
+
+        // Deprecated: set attributes directly
+        void EnableServiceTicketsFetchOptions(const TStringBuf selfSecret,
+                                              TDstVector&& dsts,
+                                              const bool considerIncompleteTicketsSetAsError = true) {
+            IsIncompleteTicketsSetAnError = considerIncompleteTicketsSetAsError;
+            Secret = selfSecret;
+            FetchServiceTicketsForDsts = std::move(dsts);
+        }
+
+    public:
+        bool IsServiceTicketFetchingRequired() const {
+            return bool(Secret.Value());
+        }
+
+        bool NeedServiceTicketsFetching() const {
+            return !FetchServiceTicketsForDsts.empty() ||
+                   !FetchServiceTicketsForDstsWithAliases.empty() ||
+                   FetchRolesForIdmSystemSlug;
+        }
+
+        // TODO: get rid of TDst: PASSP-35377
+        class TDst {
+        public:
+            TDst(TTvmId id)
+                : Id(id)
+            {
+                Y_ENSURE_EX(id != 0, TBrokenTvmClientSettings() << "TvmId cannot be 0");
+            }
+
+            TTvmId Id;
+
+            bool operator==(const TDst& o) const {
+                return Id == o.Id;
+            }
+
+            bool operator<(const TDst& o) const {
+                return Id < o.Id;
+            }
+
+        public: // for python binding
+            TDst()
+                : Id(0)
+            {
+            }
+        };
+
+    public:
+        static void CheckPermissions(const TString& dir);
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/api/threaded_updater.cpp b/library/cpp/tvmauth/client/misc/api/threaded_updater.cpp
new file mode 100644
index 0000000000..c4a6415be8
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/threaded_updater.cpp
@@ -0,0 +1,1049 @@
+#include "threaded_updater.h"
+
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+#include <library/cpp/tvmauth/client/misc/utils.h>
+#include <library/cpp/tvmauth/client/misc/retry_settings/v1/settings.pb.h>
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/json/json_reader.h>
+
+#include <util/stream/str.h>
+#include <util/string/builder.h>
+#include <util/string/cast.h>
+#include <util/system/thread.h>
+
+namespace NTvmAuth::NTvmApi {
+    static TString CreatePublicKeysUrl(const TClientSettings& settings,
+                                       const NUtils::TProcInfo& procInfo) {
+        TStringStream s;
+        s << "/2/keys";
+        s << "?";
+        procInfo.AddToRequest(s);
+
+        s << "&get_retry_settings=yes";
+
+        if (settings.SelfTvmId != 0) {
+            s << "&src=" << settings.SelfTvmId;
+        }
+
+        if (settings.CheckUserTicketsWithBbEnv) {
+            s << "&env=" << static_cast<int>(*settings.CheckUserTicketsWithBbEnv);
+        }
+
+        return s.Str();
+    }
+
+    TAsyncUpdaterPtr TThreadedUpdater::Create(const TClientSettings& settings, TLoggerPtr logger) {
+        Y_ENSURE_EX(logger, TNonRetriableException() << "Logger is required");
+        THolder<TThreadedUpdater> p(new TThreadedUpdater(settings, std::move(logger)));
+        p->Init();
+        p->StartWorker();
+        return p.Release();
+    }
+
+    TThreadedUpdater::~TThreadedUpdater() {
+        ExpBackoff_.SetEnabled(false);
+        ExpBackoff_.Interrupt();
+        StopWorker(); // Required here to avoid using of deleted members
+    }
+
+    TClientStatus TThreadedUpdater::GetStatus() const {
+        const TClientStatus::ECode state = GetState();
+        return TClientStatus(state, GetLastError(state == TClientStatus::Ok || state == TClientStatus::IncompleteTicketsSet));
+    }
+
+    NRoles::TRolesPtr TThreadedUpdater::GetRoles() const {
+        Y_ENSURE_EX(RolesFetcher_,
+                    TBrokenTvmClientSettings() << "Roles were not configured in settings");
+        return RolesFetcher_->GetCurrentRoles();
+    }
+
+    TClientStatus::ECode TThreadedUpdater::GetState() const {
+        const TInstant now = TInstant::Now();
+
+        if (Settings_.IsServiceTicketFetchingRequired()) {
+            if (AreServiceTicketsInvalid(now)) {
+                return TClientStatus::Error;
+            }
+            auto tickets = GetCachedServiceTickets();
+            if (!tickets) {
+                return TClientStatus::Error;
+            }
+            if (tickets->TicketsById.size() < GetDsts()->size()) {
+                if (Settings_.IsIncompleteTicketsSetAnError) {
+                    return TClientStatus::Error;
+                } else {
+                    return TClientStatus::IncompleteTicketsSet;
+                }
+            }
+        }
+        if ((Settings_.CheckServiceTickets || Settings_.CheckUserTicketsWithBbEnv) && ArePublicKeysInvalid(now)) {
+            return TClientStatus::Error;
+        }
+
+        const TDuration sincePublicKeysUpdate = now - GetUpdateTimeOfPublicKeys();
+        const TDuration sinceServiceTicketsUpdate = now - GetUpdateTimeOfServiceTickets();
+        const TDuration sinceRolesUpdate = now - GetUpdateTimeOfRoles();
+
+        if (Settings_.IsServiceTicketFetchingRequired() && sinceServiceTicketsUpdate > ServiceTicketsDurations_.Expiring) {
+            return TClientStatus::Warning;
+        }
+        if ((Settings_.CheckServiceTickets || Settings_.CheckUserTicketsWithBbEnv) &&
+            sincePublicKeysUpdate > PublicKeysDurations_.Expiring)
+        {
+            return TClientStatus::Warning;
+        }
+        if (RolesFetcher_ && TRolesFetcher::ShouldWarn(RetrySettings_, sinceRolesUpdate)) {
+            return TClientStatus::Warning;
+        }
+
+        return TClientStatus::Ok;
+    }
+
+    TThreadedUpdater::TThreadedUpdater(const TClientSettings& settings, TLoggerPtr logger)
+        : TThreadedUpdaterBase(
+              TRetrySettings{}.WorkerAwakingPeriod,
+              std::move(logger),
+              settings.TvmHost,
+              settings.TvmPort,
+              settings.TvmSocketTimeout,
+              settings.TvmConnectTimeout)
+        , ExpBackoff_(RetrySettings_.BackoffSettings)
+        , ServiceTicketBatchUpdateMutex_(std::make_unique<std::mutex>())
+        , Settings_(settings.CloneNormalized())
+        , ProcInfo_(NUtils::TProcInfo::Create(Settings_.LibVersionPrefix))
+        , PublicKeysUrl_(CreatePublicKeysUrl(Settings_, ProcInfo_))
+        , DstAliases_(MakeAliasMap(Settings_))
+        , Headers_({{"Content-Type", "application/x-www-form-urlencoded"}})
+        , Random_(TInstant::Now().MicroSeconds())
+    {
+        if (Settings_.IsServiceTicketFetchingRequired()) {
+            SigningContext_ = TServiceContext::SigningFactory(Settings_.Secret);
+        }
+
+        if (Settings_.IsServiceTicketFetchingRequired()) {
+            Destinations_ = std::make_shared<const TDstSet>(Settings_.FetchServiceTicketsForDsts.begin(), Settings_.FetchServiceTicketsForDsts.end());
+        }
+
+        PublicKeysDurations_.RefreshPeriod = TDuration::Days(1);
+        ServiceTicketsDurations_.RefreshPeriod = TDuration::Hours(1);
+
+        if (Settings_.CheckUserTicketsWithBbEnv) {
+            SetBbEnv(*Settings_.CheckUserTicketsWithBbEnv);
+        }
+
+        if (Settings_.FetchRolesForIdmSystemSlug) {
+            RolesFetcher_ = std::make_unique<TRolesFetcher>(
+                TRolesFetcherSettings{
+                    Settings_.TiroleHost,
+                    Settings_.TirolePort,
+                    Settings_.DiskCacheDir,
+                    ProcInfo_,
+                    Settings_.SelfTvmId,
+                    Settings_.FetchRolesForIdmSystemSlug,
+                },
+                Logger_);
+        }
+
+        if (Settings_.DiskCacheDir) {
+            TString path = Settings_.DiskCacheDir;
+            if (path.back() != '/') {
+                path.push_back('/');
+            }
+
+            if (Settings_.IsServiceTicketFetchingRequired()) {
+                ServiceTicketsFilepath_ = path;
+                ServiceTicketsFilepath_.append("service_tickets");
+            }
+
+            if (Settings_.CheckServiceTickets || Settings_.CheckUserTicketsWithBbEnv) {
+                PublicKeysFilepath_ = path;
+                PublicKeysFilepath_.append("public_keys");
+            }
+
+            RetrySettingsFilepath_ = path + "retry_settings";
+        } else {
+            LogInfo("Disk cache disabled. Please set disk cache directory in settings for best reliability");
+        }
+    }
+
+    void TThreadedUpdater::Init() {
+        ReadStateFromDisk();
+        ClearErrors();
+        ExpBackoff_.SetEnabled(false);
+
+        // First of all try to get tickets: there are a lot of reasons to fail this request.
+        // As far as disk cache usually disabled, client will not fetch keys before fail on every ctor call.
+        UpdateServiceTickets();
+        if (!AreServicesTicketsOk()) {
+            ThrowLastError();
+        }
+
+        UpdatePublicKeys();
+        if (!IsServiceContextOk() || !IsUserContextOk()) {
+            ThrowLastError();
+        }
+
+        UpdateRoles();
+        if (RolesFetcher_ && !RolesFetcher_->AreRolesOk()) {
+            ThrowLastError();
+        }
+
+        Inited_ = true;
+        ExpBackoff_.SetEnabled(true);
+    }
+
+    void TThreadedUpdater::UpdateServiceTickets() {
+        if (!Settings_.IsServiceTicketFetchingRequired()) {
+            return;
+        }
+
+        TInstant stut = GetUpdateTimeOfServiceTickets();
+        try {
+            if (IsTimeToUpdateServiceTickets(stut)) {
+                UpdateAllServiceTickets();
+                NeedFetchMissingServiceTickets_ = false;
+            } else if (NeedFetchMissingServiceTickets_) {
+                TDstSetPtr dsts = GetDsts();
+                if (GetCachedServiceTickets()->TicketsById.size() < dsts->size()) {
+                    UpdateMissingServiceTickets(*dsts);
+                    NeedFetchMissingServiceTickets_ = false;
+                }
+            }
+            if (AreServicesTicketsOk()) {
+                ClearError(EScope::ServiceTickets);
+            }
+        } catch (const std::exception& e) {
+            ProcessError(EType::Retriable, EScope::ServiceTickets, e.what());
+            LogWarning(TStringBuilder() << "Failed to update service tickets: " << e.what());
+            if (TInstant::Now() - stut > ServiceTicketsDurations_.Expiring) {
+                LogError("Service tickets have not been refreshed for too long period");
+            }
+        }
+    }
+
+    void TThreadedUpdater::UpdateAllServiceTickets() {
+        TDstSetPtr dsts = GetDsts();
+        THttpResult st = GetServiceTicketsFromHttp(*dsts, RetrySettings_.DstsLimit);
+
+        std::unique_lock lock(*ServiceTicketBatchUpdateMutex_);
+
+        auto oldCache = GetCachedServiceTickets();
+        if (oldCache) {
+            if (dsts->size() < GetDsts()->size()) {
+                for (const auto& pair : oldCache->TicketsById) {
+                    st.TicketsWithErrors.Tickets.insert(pair);
+                }
+            }
+
+            for (const auto& pair : oldCache->ErrorsById) {
+                st.TicketsWithErrors.Errors.insert(pair);
+            }
+        }
+
+        UpdateServiceTicketsCache(std::move(st.TicketsWithErrors), TInstant::Now());
+
+        lock.unlock();
+
+        if (ServiceTicketsFilepath_) {
+            DiskCacheServiceTickets_ = CreateJsonArray(st.Responses);
+            TDiskWriter w(ServiceTicketsFilepath_, Logger_.Get());
+            w.Write(PrepareTicketsForDisk(DiskCacheServiceTickets_, Settings_.SelfTvmId));
+        }
+    }
+
+    TServiceTicketsPtr TThreadedUpdater::UpdateMissingServiceTickets(const TDstSet& required) {
+        TServiceTicketsPtr cache = GetCachedServiceTickets();
+        TClientSettings::TDstVector missingDsts = FindMissingDsts(cache, required);
+
+        if (missingDsts.empty()) {
+            return cache;
+        }
+
+        THttpResult st = GetServiceTicketsFromHttp(missingDsts, RetrySettings_.DstsLimit);
+
+        std::unique_lock lock(*ServiceTicketBatchUpdateMutex_);
+
+        cache = GetCachedServiceTickets();
+        size_t gotTickets = st.TicketsWithErrors.Tickets.size();
+
+        TDstSetPtr oldDsts = GetDsts();
+        std::shared_ptr<TDstSet> newDsts = std::make_shared<TDstSet>(oldDsts->begin(), oldDsts->end());
+
+        for (const auto& pair : cache->TicketsById) {
+            st.TicketsWithErrors.Tickets.insert(pair);
+        }
+        for (const auto& pair : cache->ErrorsById) {
+            st.TicketsWithErrors.Errors.insert(pair);
+        }
+        for (const auto& pair : st.TicketsWithErrors.Tickets) {
+            st.TicketsWithErrors.Errors.erase(pair.first);
+            newDsts->insert(pair.first);
+        }
+
+        TServiceTicketsPtr c = UpdateServiceTicketsCachePartly(
+            std::move(st.TicketsWithErrors),
+            gotTickets);
+
+        SetDsts(std::move(newDsts));
+
+        lock.unlock();
+
+        if (!c) {
+            LogWarning("UpdateMissingServiceTickets: new cache is NULL. BUG?");
+            c = cache;
+        }
+
+        if (!ServiceTicketsFilepath_) {
+            return c;
+        }
+
+        DiskCacheServiceTickets_ = AppendToJsonArray(DiskCacheServiceTickets_, st.Responses);
+
+        TDiskWriter w(ServiceTicketsFilepath_, Logger_.Get());
+        w.Write(PrepareTicketsForDisk(DiskCacheServiceTickets_, Settings_.SelfTvmId));
+
+        return c;
+    }
+
+    void TThreadedUpdater::UpdatePublicKeys() {
+        if (!Settings_.CheckServiceTickets && !Settings_.CheckUserTicketsWithBbEnv) {
+            return;
+        }
+
+        TInstant pkut = GetUpdateTimeOfPublicKeys();
+        if (!IsTimeToUpdatePublicKeys(pkut)) {
+            return;
+        }
+
+        try {
+            TString publicKeys = GetPublicKeysFromHttp();
+
+            UpdatePublicKeysCache(publicKeys, TInstant::Now());
+            if (PublicKeysFilepath_) {
+                TDiskWriter w(PublicKeysFilepath_, Logger_.Get());
+                w.Write(publicKeys);
+            }
+            if (IsServiceContextOk() && IsUserContextOk()) {
+                ClearError(EScope::PublicKeys);
+            }
+        } catch (const std::exception& e) {
+            ProcessError(EType::Retriable, EScope::PublicKeys, e.what());
+            LogWarning(TStringBuilder() << "Failed to update public keys: " << e.what());
+            if (TInstant::Now() - pkut > PublicKeysDurations_.Expiring) {
+                LogError("Public keys have not been refreshed for too long period");
+            }
+        }
+    }
+
+    void TThreadedUpdater::UpdateRoles() {
+        if (!RolesFetcher_) {
+            return;
+        }
+
+        TInstant rut = GetUpdateTimeOfRoles();
+        if (!TRolesFetcher::IsTimeToUpdate(RetrySettings_, TInstant::Now() - rut)) {
+            return;
+        }
+
+        struct TCloser {
+            TRolesFetcher* Fetcher;
+            ~TCloser() {
+                Fetcher->ResetConnection();
+            }
+        } closer{RolesFetcher_.get()};
+
+        try {
+            TServiceTicketsPtr st = GetCachedServiceTickets();
+            Y_ENSURE(st, "No one service ticket in memory: how it possible?");
+            auto it = st->TicketsById.find(Settings_.TiroleTvmId);
+            Y_ENSURE(it != st->TicketsById.end(),
+                     "Missing tvmid for tirole in cache: " << Settings_.TiroleTvmId);
+
+            RolesFetcher_->Update(
+                FetchWithRetries(
+                    [&]() { return RolesFetcher_->FetchActualRoles(it->second); },
+                    EScope::Roles));
+            SetUpdateTimeOfRoles(TInstant::Now());
+
+            if (RolesFetcher_->AreRolesOk()) {
+                ClearError(EScope::Roles);
+            }
+        } catch (const std::exception& e) {
+            ProcessError(EType::Retriable, EScope::Roles, e.what());
+            LogWarning(TStringBuilder() << "Failed to update roles: " << e.what());
+            if (TRolesFetcher::ShouldWarn(RetrySettings_, TInstant::Now() - rut)) {
+                LogError("Roles have not been refreshed for too long period");
+            }
+        }
+    }
+
+    TServiceTicketsPtr TThreadedUpdater::UpdateServiceTicketsCachePartly(
+        TAsyncUpdaterBase::TPairTicketsErrors&& tickets,
+        size_t got) {
+        size_t count = tickets.Tickets.size();
+        TServiceTicketsPtr c = MakeIntrusiveConst<TServiceTickets>(std::move(tickets.Tickets),
+                                                                   std::move(tickets.Errors),
+                                                                   DstAliases_);
+        SetServiceTickets(c);
+        LogInfo(TStringBuilder()
+                << "Cache was partly updated with " << got
+                << " service ticket(s). total: " << count);
+
+        return c;
+    }
+
+    void TThreadedUpdater::UpdateServiceTicketsCache(TPairTicketsErrors&& tickets, TInstant time) {
+        size_t count = tickets.Tickets.size();
+        SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(std::move(tickets.Tickets),
+                                                              std::move(tickets.Errors),
+                                                              DstAliases_));
+
+        SetUpdateTimeOfServiceTickets(time);
+
+        if (count > 0) {
+            LogInfo(TStringBuilder() << "Cache was updated with " << count << " service ticket(s): " << time);
+        }
+    }
+
+    void TThreadedUpdater::UpdatePublicKeysCache(const TString& publicKeys, TInstant time) {
+        if (publicKeys.empty()) {
+            return;
+        }
+
+        if (Settings_.CheckServiceTickets) {
+            SetServiceContext(MakeIntrusiveConst<TServiceContext>(
+                TServiceContext::CheckingFactory(Settings_.SelfTvmId,
+                                                 publicKeys)));
+        }
+
+        if (Settings_.CheckUserTicketsWithBbEnv) {
+            SetUserContext(publicKeys);
+        }
+
+        SetUpdateTimeOfPublicKeys(time);
+
+        LogInfo(TStringBuilder() << "Cache was updated with public keys: " << time);
+    }
+
+    void TThreadedUpdater::ReadStateFromDisk() {
+        try {
+            TServiceTicketsFromDisk st;
+            std::tie(st, StartUpCache_) = ReadServiceTicketsFromDisk();
+            UpdateServiceTicketsCache(std::move(st.TicketsWithErrors), st.BornDate);
+            DiskCacheServiceTickets_ = st.FileBody;
+        } catch (const std::exception& e) {
+            LogWarning(TStringBuilder() << "Failed to read service tickets from disk: " << e.what());
+        }
+
+        try {
+            std::pair<TString, TInstant> pk = ReadPublicKeysFromDisk();
+            UpdatePublicKeysCache(pk.first, pk.second);
+        } catch (const std::exception& e) {
+            LogWarning(TStringBuilder() << "Failed to read public keys from disk: " << e.what());
+        }
+
+        try {
+            TString rs = ReadRetrySettingsFromDisk();
+            UpdateRetrySettings(rs);
+        } catch (const std::exception& e) {
+            LogWarning(TStringBuilder() << "Failed to read retry settings from disk: " << e.what());
+        }
+
+        try {
+            if (RolesFetcher_) {
+                SetUpdateTimeOfRoles(RolesFetcher_->ReadFromDisk());
+            }
+        } catch (const std::exception& e) {
+            LogWarning(TStringBuilder() << "Failed to read roles from disk: " << e.what());
+        }
+    }
+
+    std::pair<TThreadedUpdater::TServiceTicketsFromDisk, TThreadedUpdater::TServiceTicketsFromDisk> TThreadedUpdater::ReadServiceTicketsFromDisk() const {
+        if (!ServiceTicketsFilepath_) {
+            return {};
+        }
+
+        TDiskReader r(ServiceTicketsFilepath_, Logger_.Get());
+        if (!r.Read()) {
+            return {};
+        }
+
+        std::pair<TStringBuf, TTvmId> data = ParseTicketsFromDisk(r.Data());
+        if (data.second != Settings_.SelfTvmId) {
+            TStringStream s;
+            s << "Disk cache is for another tvmId (" << data.second << "). ";
+            s << "Self=" << Settings_.SelfTvmId;
+            LogWarning(s.Str());
+            return {};
+        }
+
+        TThreadedUpdater::TServiceTicketsFromDisk resDst{
+            .BornDate = r.Time(),
+            .FileBody = TString(data.first),
+        };
+
+        TThreadedUpdater::TServiceTicketsFromDisk resAll{
+            .BornDate = r.Time(),
+            .FileBody = TString(data.first),
+        };
+
+        TDstSetPtr dsts = GetDsts();
+        ParseTicketsFromResponse(data.first, *dsts, resDst.TicketsWithErrors);
+
+        if (IsInvalid(TServiceTickets::GetInvalidationTime(resDst.TicketsWithErrors.Tickets), TInstant::Now())) {
+            LogWarning("Disk cache (service tickets) is too old");
+            return {};
+        }
+
+        try {
+            ParseTicketsFromDiskCache(data.first, resAll.TicketsWithErrors);
+        } catch (std::exception& e) {
+            LogWarning(TStringBuilder() << "Failed to parse all service tickets from disk cache: " << e.what());
+            LogInfo(TStringBuilder() << "Got " << resDst.TicketsWithErrors.Tickets.size() << " service ticket(s) from disk");
+            return {std::move(resDst), {}};
+        }
+
+        if (resAll.TicketsWithErrors.Tickets.empty()) {
+            LogInfo(TStringBuilder() << "Got " << resDst.TicketsWithErrors.Tickets.size() << " service ticket(s) from disk");
+            return {std::move(resDst), std::move(resAll)};
+        }
+
+        if (IsInvalid(TServiceTickets::GetInvalidationTime(resAll.TicketsWithErrors.Tickets), TInstant::Now())) {
+            LogWarning("Disk cache (service tickets) is too old");
+            LogInfo(TStringBuilder() << "Got " << resDst.TicketsWithErrors.Tickets.size() << " service ticket(s) from disk");
+            return {std::move(resDst), {}};
+        }
+
+        LogInfo(TStringBuilder() << "Got " << resAll.TicketsWithErrors.Tickets.size() << " service ticket(s) from disk");
+        return {std::move(resDst), std::move(resAll)};
+    }
+
+    std::pair<TString, TInstant> TThreadedUpdater::ReadPublicKeysFromDisk() const {
+        if (!PublicKeysFilepath_) {
+            return {};
+        }
+
+        TDiskReader r(PublicKeysFilepath_, Logger_.Get());
+        if (!r.Read()) {
+            return {};
+        }
+
+        if (TInstant::Now() - r.Time() > PublicKeysDurations_.Invalid) {
+            LogWarning("Disk cache (public keys) is too old");
+            return {};
+        }
+
+        return {r.Data(), r.Time()};
+    }
+
+    TString TThreadedUpdater::ReadRetrySettingsFromDisk() const {
+        if (!RetrySettingsFilepath_) {
+            return {};
+        }
+
+        TDiskReader r(RetrySettingsFilepath_, Logger_.Get());
+        if (!r.Read()) {
+            return {};
+        }
+
+        return r.Data();
+    }
+
+    template <class Dsts>
+    TThreadedUpdater::THttpResult TThreadedUpdater::GetServiceTicketsFromHttp(const Dsts& dsts, const size_t dstLimit) const {
+        Y_ENSURE(SigningContext_, "Internal error");
+
+        TClientSettings::TDstVector part;
+        part.reserve(dstLimit);
+        THttpResult res;
+        res.TicketsWithErrors.Tickets.reserve(dsts.size());
+        res.Responses.reserve(dsts.size() / dstLimit + 1);
+
+        for (auto it = dsts.begin(); it != dsts.end();) {
+            part.clear();
+            for (size_t count = 0; it != dsts.end() && count < dstLimit; ++count, ++it) {
+                part.push_back(*it);
+            }
+
+            TString response =
+                FetchWithRetries(
+                    [this, &part]() {
+                        // create request here to keep 'ts' actual
+                        return FetchServiceTicketsFromHttp(PrepareRequestForServiceTickets(
+                            Settings_.SelfTvmId,
+                            *SigningContext_,
+                            part,
+                            ProcInfo_));
+                    },
+                    EScope::ServiceTickets)
+                    .Response;
+            ParseTicketsFromResponse(response, part, res.TicketsWithErrors);
+            LogDebug(TStringBuilder()
+                     << "Response with service tickets for " << part.size()
+                     << " destination(s) was successfully fetched from " << TvmUrl_);
+
+            res.Responses.push_back(response);
+        }
+
+        LogDebug(TStringBuilder()
+                 << "Got responses with service tickets with " << res.Responses.size() << " pages for "
+                 << dsts.size() << " destination(s)");
+        for (const auto& p : res.TicketsWithErrors.Errors) {
+            LogError(TStringBuilder()
+                     << "Failed to get service ticket for dst=" << p.first << ": " << p.second);
+        }
+
+        return res;
+    }
+
+    TString TThreadedUpdater::GetPublicKeysFromHttp() const {
+        TString publicKeys =
+            FetchWithRetries(
+                [this]() { return FetchPublicKeysFromHttp(); },
+                EScope::PublicKeys)
+                .Response;
+
+        LogDebug("Public keys were successfully fetched from " + TvmUrl_);
+
+        return publicKeys;
+    }
+
+    TServiceTickets::TMapIdStr TThreadedUpdater::GetRequestedTicketsFromStartUpCache(const TDstSet& dsts) const {
+        TServiceTickets::TMapIdStr res;
+        for (const TClientSettings::TDst& dst : dsts) {
+            auto it = StartUpCache_.TicketsWithErrors.Tickets.find(dst.Id);
+            if (it != StartUpCache_.TicketsWithErrors.Tickets.end()) {
+                res[dst.Id] = it->second;
+            }
+        }
+        return res;
+    }
+
+    TInstant TThreadedUpdater::GetStartUpCacheBornDate() const {
+        return StartUpCache_.BornDate;
+    }
+
+    NUtils::TFetchResult TThreadedUpdater::FetchServiceTicketsFromHttp(const TString& body) const {
+        TStringStream s;
+
+        THttpHeaders outHeaders;
+        TKeepAliveHttpClient::THttpCode code = GetClient().DoPost("/2/ticket", body, &s, Headers_, &outHeaders);
+
+        const THttpInputHeader* settings = outHeaders.FindHeader("X-Ya-Retry-Settings");
+
+        return {code, {}, "/2/ticket", s.Str(), settings ? settings->Value() : ""};
+    }
+
+    NUtils::TFetchResult TThreadedUpdater::FetchPublicKeysFromHttp() const {
+        TStringStream s;
+
+        THttpHeaders outHeaders;
+        TKeepAliveHttpClient::THttpCode code = GetClient().DoGet(PublicKeysUrl_, &s, {}, &outHeaders);
+
+        const THttpInputHeader* settings = outHeaders.FindHeader("X-Ya-Retry-Settings");
+
+        return {code, {}, "/2/keys", s.Str(), settings ? settings->Value() : ""};
+    }
+
+    bool TThreadedUpdater::UpdateRetrySettings(const TString& header) const {
+        if (header.empty()) {
+            // Probably it is some kind of test?
+            return false;
+        }
+
+        try {
+            TString raw = NUtils::Base64url2bin(header);
+            Y_ENSURE(raw, "Invalid base64url in settings");
+
+            retry_settings::v1::Settings proto;
+            Y_ENSURE(proto.ParseFromString(raw), "Invalid proto");
+
+            // This ugly hack helps to process these settings in any case
+            TThreadedUpdater& this_ = *const_cast<TThreadedUpdater*>(this);
+            TRetrySettings& res = this_.RetrySettings_;
+
+            TStringStream diff;
+            auto update = [&diff](auto& l, const auto& r, TStringBuf desc) {
+                if (l != r) {
+                    diff << desc << ":" << l << "->" << r << ";";
+                    l = r;
+                }
+            };
+
+            if (proto.has_exponential_backoff_min_sec()) {
+                update(res.BackoffSettings.Min,
+                       TDuration::Seconds(proto.exponential_backoff_min_sec()),
+                       "exponential_backoff_min");
+            }
+            if (proto.has_exponential_backoff_max_sec()) {
+                update(res.BackoffSettings.Max,
+                       TDuration::Seconds(proto.exponential_backoff_max_sec()),
+                       "exponential_backoff_max");
+            }
+            if (proto.has_exponential_backoff_factor()) {
+                update(res.BackoffSettings.Factor,
+                       proto.exponential_backoff_factor(),
+                       "exponential_backoff_factor");
+            }
+            if (proto.has_exponential_backoff_jitter()) {
+                update(res.BackoffSettings.Jitter,
+                       proto.exponential_backoff_jitter(),
+                       "exponential_backoff_jitter");
+            }
+            this_.ExpBackoff_.UpdateSettings(res.BackoffSettings);
+
+            if (proto.has_max_random_sleep_default()) {
+                update(res.MaxRandomSleepDefault,
+                       TDuration::MilliSeconds(proto.max_random_sleep_default()),
+                       "max_random_sleep_default");
+            }
+            if (proto.has_max_random_sleep_when_ok()) {
+                update(res.MaxRandomSleepWhenOk,
+                       TDuration::MilliSeconds(proto.max_random_sleep_when_ok()),
+                       "max_random_sleep_when_ok");
+            }
+            if (proto.has_retries_on_start()) {
+                Y_ENSURE(proto.retries_on_start(), "retries_on_start==0");
+                update(res.RetriesOnStart,
+                       proto.retries_on_start(),
+                       "retries_on_start");
+            }
+            if (proto.has_retries_in_background()) {
+                Y_ENSURE(proto.retries_in_background(), "retries_in_background==0");
+                update(res.RetriesInBackground,
+                       proto.retries_in_background(),
+                       "retries_in_background");
+            }
+            if (proto.has_worker_awaking_period_sec()) {
+                update(res.WorkerAwakingPeriod,
+                       TDuration::Seconds(proto.worker_awaking_period_sec()),
+                       "worker_awaking_period");
+                this_.WorkerAwakingPeriod_ = res.WorkerAwakingPeriod;
+            }
+            if (proto.has_dsts_limit()) {
+                Y_ENSURE(proto.dsts_limit(), "dsts_limit==0");
+                update(res.DstsLimit,
+                       proto.dsts_limit(),
+                       "dsts_limit");
+            }
+
+            if (proto.has_roles_update_period_sec()) {
+                Y_ENSURE(proto.roles_update_period_sec(), "roles_update_period==0");
+                update(res.RolesUpdatePeriod,
+                       TDuration::Seconds(proto.roles_update_period_sec()),
+                       "roles_update_period_sec");
+            }
+            if (proto.has_roles_warn_period_sec()) {
+                Y_ENSURE(proto.roles_warn_period_sec(), "roles_warn_period_sec==0");
+                update(res.RolesWarnPeriod,
+                       TDuration::Seconds(proto.roles_warn_period_sec()),
+                       "roles_warn_period_sec");
+            }
+
+            if (diff.empty()) {
+                return false;
+            }
+
+            LogDebug("Retry settings were updated: " + diff.Str());
+            return true;
+        } catch (const std::exception& e) {
+            LogWarning(TStringBuilder()
+                       << "Failed to update retry settings from server, header '"
+                       << header << "': "
+                       << e.what());
+        }
+
+        return false;
+    }
+
+    template <typename Func>
+    NUtils::TFetchResult TThreadedUpdater::FetchWithRetries(Func func, EScope scope) const {
+        const ui32 tries = Inited_ ? RetrySettings_.RetriesInBackground
+                                   : RetrySettings_.RetriesOnStart;
+
+        for (size_t idx = 1;; ++idx) {
+            RandomSleep();
+
+            try {
+                NUtils::TFetchResult result = func();
+
+                if (UpdateRetrySettings(result.RetrySettings) && RetrySettingsFilepath_) {
+                    TDiskWriter w(RetrySettingsFilepath_, Logger_.Get());
+                    w.Write(result.RetrySettings);
+                }
+
+                if (400 <= result.Code && result.Code <= 499) {
+                    throw TNonRetriableException() << ProcessHttpError(scope, result.Path, result.Code, result.Response);
+                }
+                if (result.Code < 200 || result.Code >= 399) {
+                    throw yexception() << ProcessHttpError(scope, result.Path, result.Code, result.Response);
+                }
+
+                ExpBackoff_.Decrease();
+                return result;
+            } catch (const TNonRetriableException& e) {
+                LogWarning(TStringBuilder() << "Failed to get " << scope << ": " << e.what());
+                ExpBackoff_.Increase();
+                throw;
+            } catch (const std::exception& e) {
+                LogWarning(TStringBuilder() << "Failed to get " << scope << ": " << e.what());
+                ExpBackoff_.Increase();
+                if (idx >= tries) {
+                    throw;
+                }
+            }
+        }
+
+        throw yexception() << "unreachable";
+    }
+
+    void TThreadedUpdater::RandomSleep() const {
+        const TDuration maxSleep = TClientStatus::ECode::Ok == GetState()
+                                       ? RetrySettings_.MaxRandomSleepWhenOk
+                                       : RetrySettings_.MaxRandomSleepDefault;
+
+        if (maxSleep) {
+            ui32 toSleep = Random_.GenRand() % maxSleep.MilliSeconds();
+            ExpBackoff_.Sleep(TDuration::MilliSeconds(toSleep));
+        }
+    }
+
+    TString TThreadedUpdater::PrepareRequestForServiceTickets(TTvmId src,
+                                                              const TServiceContext& ctx,
+                                                              const TClientSettings::TDstVector& dsts,
+                                                              const NUtils::TProcInfo& procInfo,
+                                                              time_t now) {
+        TStringStream s;
+
+        const TString ts = IntToString<10>(now);
+        TStringStream dst;
+        dst.Reserve(10 * dsts.size());
+        for (const TClientSettings::TDst& d : dsts) {
+            if (dst.Str()) {
+                dst << ',';
+            }
+            dst << d.Id;
+        }
+
+        s << "grant_type=client_credentials";
+        s << "&src=" << src;
+        s << "&dst=" << dst.Str();
+        s << "&ts=" << ts;
+        s << "&sign=" << ctx.SignCgiParamsForTvm(ts, dst.Str());
+        s << "&get_retry_settings=yes";
+
+        s << "&";
+        procInfo.AddToRequest(s);
+
+        return s.Str();
+    }
+
+    template <class Dsts>
+    void TThreadedUpdater::ParseTicketsFromResponse(TStringBuf resp,
+                                                    const Dsts& dsts,
+                                                    TPairTicketsErrors& out) const {
+        NJson::TJsonValue doc;
+        Y_ENSURE(NJson::ReadJsonTree(resp, &doc), "Invalid json from tvm-api: " << resp);
+        const NJson::TJsonValue* currentResp = doc.IsMap() ? &doc : nullptr;
+        auto find = [&currentResp, &doc](TTvmId id, NJson::TJsonValue& obj) -> bool {
+            const TString idStr = IntToString<10>(id);
+            if (currentResp && currentResp->GetValue(idStr, &obj)) {
+                return true;
+            }
+
+            for (const NJson::TJsonValue& val : doc.GetArray()) {
+                currentResp = &val;
+                if (currentResp->GetValue(idStr, &obj)) {
+                    return true;
+                }
+            }
+
+            return false;
+        };
+
+        for (const TClientSettings::TDst& d : dsts) {
+            NJson::TJsonValue obj;
+            NJson::TJsonValue val;
+
+            if (!find(d.Id, obj) || !obj.GetValue("ticket", &val)) {
+                TString err;
+                if (obj.GetValue("error", &val)) {
+                    err = val.GetString();
+                } else {
+                    err = "Missing tvm_id in response, should never happend: " + IntToString<10>(d.Id);
+                }
+
+                TStringStream s;
+                s << "Failed to get ServiceTicket for " << d.Id << ": " << err;
+                ProcessError(EType::NonRetriable, EScope::ServiceTickets, s.Str());
+
+                out.Errors.insert({d.Id, std::move(err)});
+                continue;
+            }
+
+            out.Tickets.insert({d.Id, val.GetString()});
+        }
+    }
+
+    void TThreadedUpdater::ParseTicketsFromDiskCache(TStringBuf cache,
+                                                     TPairTicketsErrors& out) const {
+        NJson::TJsonValue doc;
+        Y_ENSURE(NJson::ReadJsonTree(cache, &doc), "Invalid json from disk: " << cache);
+
+        for (const NJson::TJsonValue& cacheItem : doc.GetArray()) {
+            for (const auto& [idStr, resp] : cacheItem.GetMap()) {
+                NJson::TJsonValue val;
+                TTvmId id;
+                if (!TryIntFromString<10, TTvmId, TString>(idStr, id)) {
+                    LogWarning(TStringBuilder() << "tvm_id in cache is not integer: " << idStr);
+                    continue;
+                }
+
+                if (resp.GetValue("ticket", &val)) {
+                    out.Tickets[id] = val.GetString();
+                } else if (resp.GetValue("error", &val)) {
+                    out.Errors[id] = val.GetString();
+                } else {
+                    out.Errors[id] = "tvm_id found, but response has no error or ticket, should never happend: " + idStr;
+                }
+            }
+        }
+    }
+
+    static const char DELIMETER = '\t';
+    TString TThreadedUpdater::PrepareTicketsForDisk(TStringBuf tvmResponse, TTvmId selfId) {
+        TStringStream s;
+        s << tvmResponse << DELIMETER << selfId;
+        return s.Str();
+    }
+
+    std::pair<TStringBuf, TTvmId> TThreadedUpdater::ParseTicketsFromDisk(TStringBuf data) {
+        TStringBuf tvmId = data.RNextTok(DELIMETER);
+        return {data, IntFromString<TTvmId, 10>(tvmId)};
+    }
+
+    TDstSetPtr TThreadedUpdater::GetDsts() const {
+        return Destinations_.Get();
+    }
+
+    void TThreadedUpdater::SetDsts(TDstSetPtr dsts) {
+        Destinations_.Set(std::move(dsts));
+    }
+
+    bool TThreadedUpdater::IsTimeToUpdateServiceTickets(TInstant lastUpdate) const {
+        return TInstant::Now() - lastUpdate > ServiceTicketsDurations_.RefreshPeriod;
+    }
+
+    bool TThreadedUpdater::IsTimeToUpdatePublicKeys(TInstant lastUpdate) const {
+        return TInstant::Now() - lastUpdate > PublicKeysDurations_.RefreshPeriod;
+    }
+
+    bool TThreadedUpdater::AreServicesTicketsOk() const {
+        if (!Settings_.IsServiceTicketFetchingRequired()) {
+            return true;
+        }
+        auto c = GetCachedServiceTickets();
+        return c && (!Settings_.IsIncompleteTicketsSetAnError || c->TicketsById.size() == GetDsts()->size());
+    }
+
+    bool TThreadedUpdater::IsServiceContextOk() const {
+        if (!Settings_.CheckServiceTickets) {
+            return true;
+        }
+
+        return bool(GetCachedServiceContext());
+    }
+
+    bool TThreadedUpdater::IsUserContextOk() const {
+        if (!Settings_.CheckUserTicketsWithBbEnv) {
+            return true;
+        }
+        return bool(GetCachedUserContext());
+    }
+
+    void TThreadedUpdater::Worker() {
+        UpdateServiceTickets();
+        UpdatePublicKeys();
+        UpdateRoles();
+    }
+
+    TServiceTickets::TMapAliasId TThreadedUpdater::MakeAliasMap(const TClientSettings& settings) {
+        TServiceTickets::TMapAliasId res;
+
+        for (const auto& pair : settings.FetchServiceTicketsForDstsWithAliases) {
+            res.insert({pair.first, pair.second.Id});
+        }
+
+        return res;
+    }
+
+    TClientSettings::TDstVector TThreadedUpdater::FindMissingDsts(TServiceTicketsPtr available, const TDstSet& required) {
+        Y_ENSURE(available);
+        TDstSet set;
+        // available->TicketsById is not sorted
+        for (const auto& pair : available->TicketsById) {
+            set.insert(pair.first);
+        }
+        return FindMissingDsts(set, required);
+    }
+
+    TClientSettings::TDstVector TThreadedUpdater::FindMissingDsts(const TDstSet& available, const TDstSet& required) {
+        TClientSettings::TDstVector res;
+        std::set_difference(required.begin(), required.end(),
+                            available.begin(), available.end(),
+                            std::inserter(res, res.begin()));
+        return res;
+    }
+
+    TString TThreadedUpdater::CreateJsonArray(const TSmallVec<TString>& responses) {
+        if (responses.empty()) {
+            return "[]";
+        }
+
+        size_t size = 0;
+        for (const TString& r : responses) {
+            size += r.size() + 1;
+        }
+
+        TString res;
+        res.reserve(size + 2);
+
+        res.push_back('[');
+        for (const TString& r : responses) {
+            res.append(r).push_back(',');
+        }
+        res.back() = ']';
+
+        return res;
+    }
+
+    TString TThreadedUpdater::AppendToJsonArray(const TString& json, const TSmallVec<TString>& responses) {
+        Y_ENSURE(json, "previous body required");
+
+        size_t size = 0;
+        for (const TString& r : responses) {
+            size += r.size() + 1;
+        }
+
+        TString res;
+        res.reserve(size + 2 + json.size());
+
+        res.push_back('[');
+        if (json.StartsWith('[')) {
+            Y_ENSURE(json.EndsWith(']'), "array is broken:" << json);
+            res.append(TStringBuf(json).Chop(1).Skip(1));
+        } else {
+            res.append(json);
+        }
+
+        res.push_back(',');
+        for (const TString& r : responses) {
+            res.append(r).push_back(',');
+        }
+        res.back() = ']';
+
+        return res;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/api/threaded_updater.h b/library/cpp/tvmauth/client/misc/api/threaded_updater.h
new file mode 100644
index 0000000000..cabfcf8fb5
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/threaded_updater.h
@@ -0,0 +1,153 @@
+#pragma once
+
+#include "retry_settings.h"
+#include "roles_fetcher.h"
+#include "settings.h"
+
+#include <library/cpp/tvmauth/client/misc/async_updater.h>
+#include <library/cpp/tvmauth/client/misc/threaded_updater.h>
+
+#include <util/generic/set.h>
+#include <util/random/fast.h>
+
+#include <mutex>
+
+namespace NTvmAuth::NTvmApi {
+    using TDstSet = TSet<TClientSettings::TDst>;
+    using TDstSetPtr = std::shared_ptr<const TDstSet>;
+
+    class TThreadedUpdater: public TThreadedUpdaterBase {
+    public:
+        /*!
+         * Starts thread for updating of in-memory cache in background
+         * Reads cache from disk if specified
+         * @param settings
+         * @param logger is usefull for monitoring and debuging
+         */
+        static TAsyncUpdaterPtr Create(const TClientSettings& settings, TLoggerPtr logger);
+        ~TThreadedUpdater();
+
+        TClientStatus GetStatus() const override;
+        NRoles::TRolesPtr GetRoles() const override;
+
+    protected: // for tests
+        TClientStatus::ECode GetState() const;
+
+        TThreadedUpdater(const TClientSettings& settings, TLoggerPtr logger);
+        void Init();
+
+        void UpdateServiceTickets();
+        void UpdateAllServiceTickets();
+        TServiceTicketsPtr UpdateMissingServiceTickets(const TDstSet& required);
+        void UpdatePublicKeys();
+        void UpdateRoles();
+
+        TServiceTicketsPtr UpdateServiceTicketsCachePartly(TPairTicketsErrors&& tickets, size_t got);
+        void UpdateServiceTicketsCache(TPairTicketsErrors&& tickets, TInstant time);
+        void UpdatePublicKeysCache(const TString& publicKeys, TInstant time);
+
+        void ReadStateFromDisk();
+
+        struct TServiceTicketsFromDisk {
+            TPairTicketsErrors TicketsWithErrors;
+            TInstant BornDate;
+            TString FileBody;
+        };
+
+        std::pair<TServiceTicketsFromDisk, TServiceTicketsFromDisk> ReadServiceTicketsFromDisk() const;
+
+        std::pair<TString, TInstant> ReadPublicKeysFromDisk() const;
+        TString ReadRetrySettingsFromDisk() const;
+
+        struct THttpResult {
+            TPairTicketsErrors TicketsWithErrors;
+            TSmallVec<TString> Responses;
+        };
+
+        template <class Dsts>
+        THttpResult GetServiceTicketsFromHttp(const Dsts& dsts, const size_t dstLimit) const;
+        TString GetPublicKeysFromHttp() const;
+        TServiceTickets::TMapIdStr GetRequestedTicketsFromStartUpCache(const TDstSet& dsts) const;
+
+        virtual NUtils::TFetchResult FetchServiceTicketsFromHttp(const TString& body) const;
+        virtual NUtils::TFetchResult FetchPublicKeysFromHttp() const;
+
+        bool UpdateRetrySettings(const TString& header) const;
+
+        template <typename Func>
+        NUtils::TFetchResult FetchWithRetries(Func func, EScope scope) const;
+        void RandomSleep() const;
+
+        static TString PrepareRequestForServiceTickets(TTvmId src,
+                                                       const TServiceContext& ctx,
+                                                       const TClientSettings::TDstVector& dsts,
+                                                       const NUtils::TProcInfo& procInfo,
+                                                       time_t now = time(nullptr));
+        template <class Dsts>
+        void ParseTicketsFromResponse(TStringBuf resp,
+                                      const Dsts& dsts,
+                                      TPairTicketsErrors& out) const;
+
+        void ParseTicketsFromDiskCache(TStringBuf cache,
+                                       TPairTicketsErrors& out) const;
+
+        static TString PrepareTicketsForDisk(TStringBuf tvmResponse, TTvmId selfId);
+        static std::pair<TStringBuf, TTvmId> ParseTicketsFromDisk(TStringBuf data);
+
+        TDstSetPtr GetDsts() const;
+        void SetDsts(TDstSetPtr dsts);
+
+        TInstant GetStartUpCacheBornDate() const;
+
+        bool IsTimeToUpdateServiceTickets(TInstant lastUpdate) const;
+        bool IsTimeToUpdatePublicKeys(TInstant lastUpdate) const;
+
+        bool AreServicesTicketsOk() const;
+        bool IsServiceContextOk() const;
+        bool IsUserContextOk() const;
+
+        void Worker() override;
+
+        static TServiceTickets::TMapAliasId MakeAliasMap(const TClientSettings& settings);
+        static TClientSettings::TDstVector FindMissingDsts(TServiceTicketsPtr available, const TDstSet& required);
+        static TClientSettings::TDstVector FindMissingDsts(const TDstSet& available, const TDstSet& required);
+
+        static TString CreateJsonArray(const TSmallVec<TString>& responses);
+        static TString AppendToJsonArray(const TString& json, const TSmallVec<TString>& responses);
+
+    private:
+        TRetrySettings RetrySettings_;
+
+    protected:
+        mutable TExponentialBackoff ExpBackoff_;
+        std::unique_ptr<std::mutex> ServiceTicketBatchUpdateMutex_;
+
+    private:
+        const TClientSettings Settings_;
+
+        const NUtils::TProcInfo ProcInfo_;
+
+        const TString PublicKeysUrl_;
+
+        const TServiceTickets::TMapAliasId DstAliases_;
+
+        const TKeepAliveHttpClient::THeaders Headers_;
+        TMaybe<TServiceContext> SigningContext_;
+
+        NUtils::TProtectedValue<TDstSetPtr> Destinations_;
+
+        TString DiskCacheServiceTickets_;
+        TServiceTicketsFromDisk StartUpCache_;
+        bool NeedFetchMissingServiceTickets_ = true;
+
+        TString PublicKeysFilepath_;
+        TString ServiceTicketsFilepath_;
+        TString RetrySettingsFilepath_;
+
+        std::unique_ptr<TRolesFetcher> RolesFetcher_;
+
+        mutable TReallyFastRng32 Random_;
+
+        bool Inited_ = false;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/async_updater.cpp b/library/cpp/tvmauth/client/misc/async_updater.cpp
new file mode 100644
index 0000000000..9cb0332ed4
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/async_updater.cpp
@@ -0,0 +1,152 @@
+#include "async_updater.h"
+
+#include "utils.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <util/string/builder.h>
+#include <util/system/spin_wait.h>
+
+namespace NTvmAuth {
+    TAsyncUpdaterBase::TAsyncUpdaterBase() {
+        ServiceTicketsDurations_.RefreshPeriod = TDuration::Hours(1);
+        ServiceTicketsDurations_.Expiring = TDuration::Hours(2);
+        ServiceTicketsDurations_.Invalid = TDuration::Hours(11);
+
+        PublicKeysDurations_.RefreshPeriod = TDuration::Days(1);
+        PublicKeysDurations_.Expiring = TDuration::Days(2);
+        PublicKeysDurations_.Invalid = TDuration::Days(6);
+    }
+
+    NRoles::TRolesPtr TAsyncUpdaterBase::GetRoles() const {
+        ythrow TIllegalUsage() << "not implemented";
+    }
+
+    TInstant TAsyncUpdaterBase::GetUpdateTimeOfPublicKeys() const {
+        return PublicKeysTime_.Get();
+    }
+
+    TInstant TAsyncUpdaterBase::GetUpdateTimeOfServiceTickets() const {
+        return ServiceTicketsTime_.Get();
+    }
+
+    TInstant TAsyncUpdaterBase::GetUpdateTimeOfRoles() const {
+        return RolesTime_.Get();
+    }
+
+    TInstant TAsyncUpdaterBase::GetInvalidationTimeOfPublicKeys() const {
+        TInstant ins = GetUpdateTimeOfPublicKeys();
+        return ins == TInstant() ? TInstant() : ins + PublicKeysDurations_.Invalid;
+    }
+
+    TInstant TAsyncUpdaterBase::GetInvalidationTimeOfServiceTickets() const {
+        TServiceTicketsPtr c = GetCachedServiceTickets();
+        return c ? c->InvalidationTime : TInstant();
+    }
+
+    bool TAsyncUpdaterBase::ArePublicKeysInvalid(TInstant now) const {
+        return IsInvalid(GetInvalidationTimeOfPublicKeys(), now);
+    }
+
+    bool TAsyncUpdaterBase::AreServiceTicketsInvalid(TInstant now) const {
+        TServiceTicketsPtr c = GetCachedServiceTickets();
+        // Empty set of tickets is allways valid.
+        return c && !c->TicketsById.empty() && IsInvalid(GetInvalidationTimeOfServiceTickets(), now);
+    }
+
+    bool TAsyncUpdaterBase::IsInvalid(TInstant invTime, TInstant now) {
+        return invTime -
+                   TDuration::Minutes(1) // lag for closing from balancer
+               < now;
+    }
+
+    void TAsyncUpdaterBase::SetBbEnv(EBlackboxEnv original, TMaybe<EBlackboxEnv> overrided) {
+        if (overrided) {
+            Y_ENSURE_EX(NUtils::CheckBbEnvOverriding(original, *overrided),
+                        TBrokenTvmClientSettings() << "Overriding of BlackboxEnv is illegal: "
+                                                   << original << " -> " << *overrided);
+        }
+
+        Envs_.store({original, overrided}, std::memory_order_relaxed);
+    }
+
+    TServiceTicketsPtr TAsyncUpdaterBase::GetCachedServiceTickets() const {
+        return ServiceTickets_.Get();
+    }
+
+    TServiceContextPtr TAsyncUpdaterBase::GetCachedServiceContext() const {
+        return ServiceContext_.Get();
+    }
+
+    TUserContextPtr TAsyncUpdaterBase::GetCachedUserContext(TMaybe<EBlackboxEnv> overridenEnv) const {
+        TAllUserContextsPtr ctx = AllUserContexts_.Get();
+        if (!ctx) {
+            return nullptr;
+        }
+
+        const TEnvs envs = Envs_.load(std::memory_order_relaxed);
+        if (!envs.Original) {
+            return nullptr;
+        }
+
+        EBlackboxEnv env = *envs.Original;
+
+        if (overridenEnv) {
+            Y_ENSURE_EX(NUtils::CheckBbEnvOverriding(*envs.Original, *overridenEnv),
+                        TBrokenTvmClientSettings() << "Overriding of BlackboxEnv is illegal: "
+                                                   << *envs.Original << " -> " << *overridenEnv);
+            env = *overridenEnv;
+        } else if (envs.Overrided) {
+            env = *envs.Overrided;
+        }
+
+        return ctx->Get(env);
+    }
+
+    void TAsyncUpdaterBase::SetServiceTickets(TServiceTicketsPtr c) {
+        ServiceTickets_.Set(std::move(c));
+    }
+
+    void TAsyncUpdaterBase::SetServiceContext(TServiceContextPtr c) {
+        ServiceContext_.Set(std::move(c));
+    }
+
+    void TAsyncUpdaterBase::SetUserContext(TStringBuf publicKeys) {
+        AllUserContexts_.Set(MakeIntrusiveConst<TAllUserContexts>(publicKeys));
+    }
+
+    void TAsyncUpdaterBase::SetUpdateTimeOfPublicKeys(TInstant ins) {
+        PublicKeysTime_.Set(ins);
+    }
+
+    void TAsyncUpdaterBase::SetUpdateTimeOfServiceTickets(TInstant ins) {
+        ServiceTicketsTime_.Set(ins);
+    }
+
+    void TAsyncUpdaterBase::SetUpdateTimeOfRoles(TInstant ins) {
+        RolesTime_.Set(ins);
+    }
+
+    bool TAsyncUpdaterBase::IsServiceTicketMapOk(TServiceTicketsPtr c, size_t expectedTicketCount, bool strict) {
+        return c &&
+               (strict
+                    ? c->TicketsById.size() == expectedTicketCount
+                    : !c->TicketsById.empty());
+    }
+
+    TAllUserContexts::TAllUserContexts(TStringBuf publicKeys) {
+        auto add = [&, this](EBlackboxEnv env) {
+            Ctx_[(size_t)env] = MakeIntrusiveConst<TUserContext>(env, publicKeys);
+        };
+
+        add(EBlackboxEnv::Prod);
+        add(EBlackboxEnv::Test);
+        add(EBlackboxEnv::ProdYateam);
+        add(EBlackboxEnv::TestYateam);
+        add(EBlackboxEnv::Stress);
+    }
+
+    TUserContextPtr TAllUserContexts::Get(EBlackboxEnv env) const {
+        return Ctx_[(size_t)env];
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/async_updater.h b/library/cpp/tvmauth/client/misc/async_updater.h
new file mode 100644
index 0000000000..68c0c11cf0
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/async_updater.h
@@ -0,0 +1,114 @@
+#pragma once
+
+#include "last_error.h"
+#include "service_tickets.h"
+#include "settings.h"
+#include "roles/roles.h"
+
+#include <library/cpp/tvmauth/client/client_status.h>
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/tvmauth/deprecated/service_context.h>
+#include <library/cpp/tvmauth/deprecated/user_context.h>
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/hash.h>
+#include <util/generic/maybe.h>
+#include <util/generic/noncopyable.h>
+#include <util/generic/ptr.h>
+
+#include <array>
+#include <atomic>
+
+namespace NTvmAuth {
+
+    class TAllUserContexts: public TAtomicRefCount<TAllUserContexts> {
+    public:
+        TAllUserContexts(TStringBuf publicKeys);
+
+        TUserContextPtr Get(EBlackboxEnv env) const;
+
+    private:
+        std::array<TUserContextPtr, 5> Ctx_;
+    };
+    using TAllUserContextsPtr = TIntrusiveConstPtr<TAllUserContexts>;
+
+    class TAsyncUpdaterBase: public TAtomicRefCount<TAsyncUpdaterBase>, protected TLastError, TNonCopyable {
+    public:
+        TAsyncUpdaterBase();
+        virtual ~TAsyncUpdaterBase() = default;
+
+        virtual TClientStatus GetStatus() const = 0;
+        virtual NRoles::TRolesPtr GetRoles() const;
+
+        TServiceTicketsPtr GetCachedServiceTickets() const;
+        TServiceContextPtr GetCachedServiceContext() const;
+        TUserContextPtr GetCachedUserContext(TMaybe<EBlackboxEnv> overridenEnv = {}) const;
+
+        TInstant GetUpdateTimeOfPublicKeys() const;
+        TInstant GetUpdateTimeOfServiceTickets() const;
+        TInstant GetUpdateTimeOfRoles() const;
+        TInstant GetInvalidationTimeOfPublicKeys() const;
+        TInstant GetInvalidationTimeOfServiceTickets() const;
+
+        bool ArePublicKeysInvalid(TInstant now) const;
+        bool AreServiceTicketsInvalid(TInstant now) const;
+        static bool IsInvalid(TInstant invTime, TInstant now);
+
+    protected:
+        void SetBbEnv(EBlackboxEnv original, TMaybe<EBlackboxEnv> overrided = {});
+
+        void SetServiceTickets(TServiceTicketsPtr c);
+        void SetServiceContext(TServiceContextPtr c);
+        void SetUserContext(TStringBuf publicKeys);
+        void SetUpdateTimeOfPublicKeys(TInstant ins);
+        void SetUpdateTimeOfServiceTickets(TInstant ins);
+        void SetUpdateTimeOfRoles(TInstant ins);
+
+        static bool IsServiceTicketMapOk(TServiceTicketsPtr c, size_t expectedTicketCount, bool strict);
+
+    protected:
+        struct TPairTicketsErrors {
+            TServiceTickets::TMapIdStr Tickets;
+            TServiceTickets::TMapIdStr Errors;
+
+            bool operator==(const TPairTicketsErrors& o) const {
+                return Tickets == o.Tickets && Errors == o.Errors;
+            }
+        };
+
+        struct TStateDurations {
+            TDuration RefreshPeriod;
+            TDuration Expiring;
+            TDuration Invalid;
+        };
+
+        TStateDurations ServiceTicketsDurations_;
+        TStateDurations PublicKeysDurations_;
+
+    protected:
+        virtual void StartTvmClientStopping() const {
+        }
+        virtual bool IsTvmClientStopped() const {
+            return true;
+        }
+        friend class NTvmAuth::NInternal::TClientCaningKnife;
+
+    private:
+        struct TEnvs {
+            TMaybe<EBlackboxEnv> Original;
+            TMaybe<EBlackboxEnv> Overrided;
+        };
+        static_assert(sizeof(TEnvs) <= 8, "Small struct is easy to store as atomic");
+        std::atomic<TEnvs> Envs_ = {{}};
+
+        NUtils::TProtectedValue<TServiceTicketsPtr> ServiceTickets_;
+        NUtils::TProtectedValue<TServiceContextPtr> ServiceContext_;
+        NUtils::TProtectedValue<TAllUserContextsPtr> AllUserContexts_;
+        NUtils::TProtectedValue<TInstant> PublicKeysTime_;
+        NUtils::TProtectedValue<TInstant> ServiceTicketsTime_;
+        NUtils::TProtectedValue<TInstant> RolesTime_;
+    };
+    using TAsyncUpdaterPtr = TIntrusiveConstPtr<TAsyncUpdaterBase>;
+}
diff --git a/library/cpp/tvmauth/client/misc/checker.h b/library/cpp/tvmauth/client/misc/checker.h
new file mode 100644
index 0000000000..16f1a95200
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/checker.h
@@ -0,0 +1,38 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+#include <library/cpp/tvmauth/deprecated/service_context.h>
+#include <library/cpp/tvmauth/deprecated/user_context.h>
+
+namespace NTvmAuth {
+    class TServiceTicketChecker {
+    public:
+        /*!
+         * Checking must be enabled in TClientSettings
+         * Can throw exception if cache is out of date or wrong config
+         * @param ticket
+         */
+        static TCheckedServiceTicket Check(
+            TStringBuf ticket,
+            TServiceContextPtr c,
+            const TServiceContext::TCheckFlags& flags = {}) {
+            Y_ENSURE_EX(c, TBrokenTvmClientSettings() << "Need to use TClientSettings::EnableServiceTicketChecking()");
+            return c->Check(ticket, flags);
+        }
+    };
+
+    class TUserTicketChecker {
+    public:
+        /*!
+         * Blackbox enviroment must be cofingured in TClientSettings
+         * Can throw exception if cache is out of date or wrong config
+         */
+        static TCheckedUserTicket Check(TStringBuf ticket, TUserContextPtr c) {
+            Y_ENSURE_EX(c, TBrokenTvmClientSettings() << "Need to use TClientSettings::EnableUserTicketChecking()");
+            return c->Check(ticket);
+        }
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/default_uid_checker.h b/library/cpp/tvmauth/client/misc/default_uid_checker.h
new file mode 100644
index 0000000000..b723d6e918
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/default_uid_checker.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include "roles/roles.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+#include <library/cpp/tvmauth/src/user_impl.h>
+#include <library/cpp/tvmauth/src/utils.h>
+
+namespace NTvmAuth {
+    class TDefaultUidChecker {
+    public:
+        /*!
+         * Checking must be enabled in TClientSettings
+         * Can throw exception if cache is out of date or wrong config
+         * @param ticket
+         */
+        static TCheckedUserTicket Check(TCheckedUserTicket ticket, NRoles::TRolesPtr r) {
+            Y_ENSURE_EX(r, TBrokenTvmClientSettings() << "Need to use TClientSettings::EnableRolesFetching()");
+            NRoles::TConsumerRolesPtr roles = r->GetRolesForUser(ticket);
+            if (roles) {
+                return ticket;
+            }
+
+            TUserTicketImplPtr impl = THolder(NInternal::TCanningKnife::GetU(ticket));
+            impl->SetStatus(ETicketStatus::NoRoles);
+            return TCheckedUserTicket(std::move(impl));
+        }
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/disk_cache.cpp b/library/cpp/tvmauth/client/misc/disk_cache.cpp
new file mode 100644
index 0000000000..8f3ab7770f
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/disk_cache.cpp
@@ -0,0 +1,162 @@
+#include "disk_cache.h"
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <openssl/evp.h>
+#include <openssl/hmac.h>
+
+#include <util/stream/file.h>
+#include <util/stream/str.h>
+#include <util/system/fs.h>
+#include <util/system/sysstat.h>
+
+#include <exception>
+
+namespace NTvmAuth {
+    static const size_t HASH_SIZE = 32;
+    static const size_t TIMESTAMP_SIZE = sizeof(time_t);
+
+    TDiskReader::TDiskReader(const TString& filename, ILogger* logger)
+        : Filename_(filename)
+        , Logger_(logger)
+    {
+    }
+
+    bool TDiskReader::Read() {
+        TStringStream s;
+
+        try {
+            if (!NFs::Exists(Filename_)) {
+                if (Logger_) {
+                    s << "File '" << Filename_ << "' does not exist";
+                    Logger_->Debug(s.Str());
+                }
+                return false;
+            }
+
+            TFile file(Filename_, OpenExisting | RdOnly | Seq);
+            file.Flock(LOCK_SH | LOCK_NB);
+
+            TFileInput input(file);
+            return ParseData(input.ReadAll());
+        } catch (const std::exception& e) {
+            if (Logger_) {
+                s << "Failed to read '" << Filename_ << "': " << e.what();
+                Logger_->Error(s.Str());
+            }
+        }
+
+        return false;
+    }
+
+    bool TDiskReader::ParseData(TStringBuf buf) {
+        TStringStream s;
+
+        if (buf.size() <= HASH_SIZE + TIMESTAMP_SIZE) {
+            if (Logger_) {
+                s << "File '" << Filename_ << "' is too small";
+                Logger_->Warning(s.Str());
+            }
+            return false;
+        }
+
+        TStringBuf hash = buf.SubStr(0, HASH_SIZE);
+        if (hash != GetHash(buf.Skip(HASH_SIZE))) {
+            if (Logger_) {
+                s << "Content of '" << Filename_ << "' was incorrectly changed";
+                Logger_->Warning(s.Str());
+            }
+            return false;
+        }
+
+        Time_ = TInstant::Seconds(GetTimestamp(buf.substr(0, TIMESTAMP_SIZE)));
+        Data_ = buf.Skip(TIMESTAMP_SIZE);
+
+        if (Logger_) {
+            s << "File '" << Filename_ << "' was successfully read";
+            Logger_->Info(s.Str());
+        }
+        return true;
+    }
+
+    TString TDiskReader::GetHash(TStringBuf data) {
+        TString value(EVP_MAX_MD_SIZE, 0);
+        unsigned macLen = 0;
+        if (!::HMAC(EVP_sha256(),
+                    "",
+                    0,
+                    (unsigned char*)data.data(),
+                    data.size(),
+                    (unsigned char*)value.data(),
+                    &macLen)) {
+            return {};
+        }
+
+        if (macLen != EVP_MAX_MD_SIZE) {
+            value.resize(macLen);
+        }
+
+        return value;
+    }
+
+    time_t TDiskReader::GetTimestamp(TStringBuf data) {
+        time_t time = 0;
+        for (int idx = TIMESTAMP_SIZE - 1; idx >= 0; --idx) {
+            time <<= 8;
+            time |= static_cast<unsigned char>(data.at(idx));
+        }
+        return time;
+    }
+
+    TDiskWriter::TDiskWriter(const TString& filename, ILogger* logger)
+        : Filename_(filename)
+        , Logger_(logger)
+    {
+    }
+
+    bool TDiskWriter::Write(TStringBuf data, TInstant now) {
+        TStringStream s;
+
+        try {
+            {
+                if (NFs::Exists(Filename_)) {
+                    Chmod(Filename_.c_str(),
+                          S_IRUSR | S_IWUSR); // 600
+                }
+
+                TFile file(Filename_, CreateAlways | WrOnly | Seq | AWUser | ARUser);
+                file.Flock(LOCK_EX | LOCK_NB);
+
+                TFileOutput output(file);
+                output << PrepareData(now, data);
+            }
+
+            if (Logger_) {
+                s << "File '" << Filename_ << "' was successfully written";
+                Logger_->Info(s.Str());
+            }
+            return true;
+        } catch (const std::exception& e) {
+            if (Logger_) {
+                s << "Failed to write '" << Filename_ << "': " << e.what();
+                Logger_->Error(s.Str());
+            }
+        }
+
+        return false;
+    }
+
+    TString TDiskWriter::PrepareData(TInstant time, TStringBuf data) {
+        TString toHash = WriteTimestamp(time.TimeT()) + data;
+        return TDiskReader::GetHash(toHash) + toHash;
+    }
+
+    TString TDiskWriter::WriteTimestamp(time_t time) {
+        TString res(TIMESTAMP_SIZE, 0);
+        for (size_t idx = 0; idx < TIMESTAMP_SIZE; ++idx) {
+            res[idx] = time & 0xFF;
+            time >>= 8;
+        }
+        return res;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/disk_cache.h b/library/cpp/tvmauth/client/misc/disk_cache.h
new file mode 100644
index 0000000000..9e77556f86
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/disk_cache.h
@@ -0,0 +1,50 @@
+#pragma once
+
+#include <util/datetime/base.h>
+#include <util/generic/string.h>
+
+namespace NTvmAuth {
+    class ILogger;
+
+    class TDiskReader {
+    public:
+        TDiskReader(const TString& filename, ILogger* logger = nullptr);
+
+        bool Read();
+
+        const TString& Data() const {
+            return Data_;
+        }
+
+        TInstant Time() const {
+            return Time_;
+        }
+
+    public: // for tests
+        bool ParseData(TStringBuf buf);
+
+        static TString GetHash(TStringBuf data);
+        static time_t GetTimestamp(TStringBuf data);
+
+    private:
+        TString Filename_;
+        ILogger* Logger_;
+        TInstant Time_;
+        TString Data_;
+    };
+
+    class TDiskWriter {
+    public:
+        TDiskWriter(const TString& filename, ILogger* logger = nullptr);
+
+        bool Write(TStringBuf data, TInstant now = TInstant::Now());
+
+    public: // for tests
+        static TString PrepareData(TInstant time, TStringBuf data);
+        static TString WriteTimestamp(time_t time);
+
+    private:
+        TString Filename_;
+        ILogger* Logger_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/exponential_backoff.h b/library/cpp/tvmauth/client/misc/exponential_backoff.h
new file mode 100644
index 0000000000..89a7a3c8ad
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/exponential_backoff.h
@@ -0,0 +1,94 @@
+#pragma once
+
+#include <util/datetime/base.h>
+#include <util/random/normal.h>
+#include <util/system/event.h>
+
+#include <atomic>
+
+namespace NTvmAuth {
+    // https://habr.com/ru/post/227225/
+    class TExponentialBackoff {
+    public:
+        struct TSettings {
+            TDuration Min;
+            TDuration Max;
+            double Factor = 1.001;
+            double Jitter = 0;
+
+            bool operator==(const TSettings& o) const {
+                return Min == o.Min &&
+                       Max == o.Max &&
+                       Factor == o.Factor &&
+                       Jitter == o.Jitter;
+            }
+        };
+
+        TExponentialBackoff(const TSettings& settings, bool isEnabled = true)
+            : CurrentValue_(settings.Min)
+            , IsEnabled_(isEnabled)
+        {
+            UpdateSettings(settings);
+        }
+
+        void UpdateSettings(const TSettings& settings) {
+            Y_ENSURE(settings.Factor > 1, "factor=" << settings.Factor << ". Should be > 1");
+            Y_ENSURE(settings.Jitter >= 0 && settings.Jitter < 1, "jitter should be in range [0, 1)");
+
+            Min_ = settings.Min;
+            Max_ = settings.Max;
+            Factor_ = settings.Factor;
+            Jitter_ = settings.Jitter;
+        }
+
+        TDuration Increase() {
+            CurrentValue_ = std::min(CurrentValue_ * Factor_, Max_);
+
+            double rnd = StdNormalRandom<double>();
+            const bool isNegative = rnd < 0;
+            rnd = std::abs(rnd);
+
+            const TDuration diff = rnd * Jitter_ * CurrentValue_;
+            if (isNegative) {
+                CurrentValue_ -= diff;
+            } else {
+                CurrentValue_ += diff;
+            }
+
+            return CurrentValue_;
+        }
+
+        TDuration Decrease() {
+            CurrentValue_ = std::max(CurrentValue_ / Factor_, Min_);
+            return CurrentValue_;
+        }
+
+        void Sleep(TDuration add = TDuration()) {
+            if (IsEnabled_.load(std::memory_order_relaxed)) {
+                Ev_.WaitT(CurrentValue_ + add);
+            }
+        }
+
+        void Interrupt() {
+            Ev_.Signal();
+        }
+
+        TDuration GetCurrentValue() const {
+            return CurrentValue_;
+        }
+
+        void SetEnabled(bool val) {
+            IsEnabled_.store(val);
+        }
+
+    private:
+        TDuration Min_;
+        TDuration Max_;
+        double Factor_;
+        double Jitter_;
+        TDuration CurrentValue_;
+        std::atomic_bool IsEnabled_;
+
+        TAutoEvent Ev_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/fetch_result.h b/library/cpp/tvmauth/client/misc/fetch_result.h
new file mode 100644
index 0000000000..4b0774e92f
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/fetch_result.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <library/cpp/http/simple/http_client.h>
+
+namespace NTvmAuth::NUtils {
+    struct TFetchResult {
+        TKeepAliveHttpClient::THttpCode Code;
+        THttpHeaders Headers;
+        TStringBuf Path;
+        TString Response;
+        TString RetrySettings;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/getter.h b/library/cpp/tvmauth/client/misc/getter.h
new file mode 100644
index 0000000000..6c7617b418
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/getter.h
@@ -0,0 +1,49 @@
+#pragma once
+
+#include "checker.h"
+#include "service_tickets.h"
+
+namespace NTvmAuth {
+    class TServiceTicketGetter {
+    public:
+        /*!
+         * Fetching must enabled in TClientSettings
+         * Can throw exception if cache is invalid or wrong config
+         * @param dst
+         */
+        static TString GetTicket(const TClientSettings::TAlias& dst, TServiceTicketsPtr c) {
+            Y_ENSURE_EX(c, TBrokenTvmClientSettings() << "Need to use TClientSettings::EnableServiceTicketsFetchOptions()");
+            return GetTicketImpl(dst, c->TicketsByAlias, c->ErrorsByAlias, c->UnfetchedAliases);
+        }
+
+        static TString GetTicket(const TTvmId dst, TServiceTicketsPtr c) {
+            Y_ENSURE_EX(c, TBrokenTvmClientSettings() << "Need to use TClientSettings::EnableServiceTicketsFetchOptions()");
+            return GetTicketImpl(dst, c->TicketsById, c->ErrorsById, c->UnfetchedIds);
+        }
+
+    private:
+        template <class Key, class Cont, class UnfetchedCont>
+        static TString GetTicketImpl(const Key& dst, const Cont& tickets, const Cont& errors, const UnfetchedCont& unfetched) {
+            auto it = tickets.find(dst);
+            if (it != tickets.end()) {
+                return it->second;
+            }
+
+            it = errors.find(dst);
+            if (it != errors.end()) {
+                ythrow TMissingServiceTicket()
+                    << "Failed to get ticket for '" << dst << "': "
+                    << it->second;
+            }
+
+            if (unfetched.contains(dst)) {
+                ythrow TMissingServiceTicket()
+                    << "Failed to get ticket for '" << dst << "': this dst was not fetched yet.";
+            }
+
+            ythrow TBrokenTvmClientSettings()
+                << "Destination '" << dst << "' was not specified in settings. "
+                << "Check your settings (if you use Qloud/YP/tvmtool - check it's settings)";
+        }
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/last_error.cpp b/library/cpp/tvmauth/client/misc/last_error.cpp
new file mode 100644
index 0000000000..a6279bb1ef
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/last_error.cpp
@@ -0,0 +1,115 @@
+#include "last_error.h"
+
+#include <util/string/builder.h>
+
+namespace NTvmAuth {
+    TLastError::TLastError()
+        : LastErrors_(MakeIntrusiveConst<TLastErrors>())
+    {
+    }
+
+    TString TLastError::GetLastError(bool isOk, EType* type) const {
+        if (isOk) {
+            return OK_;
+        }
+
+        const TLastErrorsPtr ptr = LastErrors_.Get();
+
+        for (const TLastErr& err : ptr->Errors) {
+            if (err && err->first == EType::NonRetriable) {
+                if (type) {
+                    *type = EType::NonRetriable;
+                }
+                return err->second;
+            }
+        }
+
+        for (const TLastErr& err : ptr->Errors) {
+            if (err) {
+                if (type) {
+                    *type = EType::Retriable;
+                }
+                return err->second;
+            }
+        }
+
+        if (type) {
+            *type = EType::NonRetriable;
+        }
+        return "Internal client error: failed to collect last useful error message, please report this message to tvm-dev@yandex-team.ru";
+    }
+
+    TString TLastError::ProcessHttpError(TLastError::EScope scope,
+                                         TStringBuf path,
+                                         int code,
+                                         const TString& msg) const {
+        TString err = TStringBuilder() << "Path:" << path << ".Code=" << code << ": " << msg;
+
+        ProcessError(code >= 400 && code < 500 ? EType::NonRetriable
+                                               : EType::Retriable,
+                     scope,
+                     err);
+
+        return err;
+    }
+
+    void TLastError::ProcessError(TLastError::EType type, TLastError::EScope scope, const TStringBuf msg) const {
+        Update(scope, [&](TLastErr& lastError) {
+            if (lastError && lastError->first == EType::NonRetriable && type == EType::Retriable) {
+                return false;
+            }
+
+            TString err = TStringBuilder() << scope << ": " << msg;
+            err.erase(std::remove(err.begin(), err.vend(), '\r'), err.vend());
+            std::replace(err.begin(), err.vend(), '\n', ' ');
+
+            lastError = {type, std::move(err)};
+            return true;
+        });
+    }
+
+    void TLastError::ClearError(TLastError::EScope scope) {
+        Update(scope, [&](TLastErr& lastError) {
+            if (!lastError) {
+                return false;
+            }
+
+            lastError.Clear();
+            return true;
+        });
+    }
+
+    void TLastError::ClearErrors() {
+        for (size_t idx = 0; idx < (size_t)EScope::COUNT; ++idx) {
+            ClearError((EScope)idx);
+        }
+    }
+
+    void TLastError::ThrowLastError() {
+        EType type;
+        TString err = GetLastError(false, &type);
+
+        switch (type) {
+            case EType::NonRetriable:
+                ythrow TNonRetriableException()
+                    << "Failed to start TvmClient. Do not retry: "
+                    << err;
+            case EType::Retriable:
+                ythrow TRetriableException()
+                    << "Failed to start TvmClient. You can retry: "
+                    << err;
+        }
+    }
+
+    template <typename Func>
+    void TLastError::Update(TLastError::EScope scope, Func func) const {
+        Y_VERIFY(scope != EScope::COUNT);
+
+        TLastErrors errs = *LastErrors_.Get();
+        TLastErr& lastError = errs.Errors[(size_t)scope];
+
+        if (func(lastError)) {
+            LastErrors_.Set(MakeIntrusiveConst<TLastErrors>(std::move(errs)));
+        }
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/last_error.h b/library/cpp/tvmauth/client/misc/last_error.h
new file mode 100644
index 0000000000..b0ad33611f
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/last_error.h
@@ -0,0 +1,51 @@
+#pragma once
+
+#include "utils.h"
+
+#include <array>
+
+namespace NTvmAuth {
+    class TLastError {
+    public:
+        enum class EType {
+            NonRetriable,
+            Retriable,
+        };
+
+        enum class EScope {
+            ServiceTickets,
+            PublicKeys,
+            Roles,
+            TvmtoolConfig,
+
+            COUNT,
+        };
+
+        using TLastErr = TMaybe<std::pair<EType, TString>>;
+
+        struct TLastErrors: public TAtomicRefCount<TLastErrors> {
+            std::array<TLastErr, (int)EScope::COUNT> Errors;
+        };
+        using TLastErrorsPtr = TIntrusiveConstPtr<TLastErrors>;
+
+    public:
+        TLastError();
+
+        TString GetLastError(bool isOk, EType* type = nullptr) const;
+
+        TString ProcessHttpError(EScope scope, TStringBuf path, int code, const TString& msg) const;
+        void ProcessError(EType type, EScope scope, const TStringBuf msg) const;
+        void ClearError(EScope scope);
+        void ClearErrors();
+        void ThrowLastError();
+
+    private:
+        template <typename Func>
+        void Update(EScope scope, Func func) const;
+
+    private:
+        const TString OK_ = "OK";
+
+        mutable NUtils::TProtectedValue<TLastErrorsPtr> LastErrors_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/proc_info.cpp b/library/cpp/tvmauth/client/misc/proc_info.cpp
new file mode 100644
index 0000000000..e2e5ec15b9
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/proc_info.cpp
@@ -0,0 +1,53 @@
+#include "proc_info.h"
+
+#include <library/cpp/tvmauth/version.h>
+
+#include <library/cpp/string_utils/quote/quote.h>
+
+#include <util/stream/file.h>
+#include <util/string/cast.h>
+#include <util/system/getpid.h>
+
+namespace NTvmAuth::NUtils {
+    void TProcInfo::AddToRequest(IOutputStream& out) const {
+        out << "_pid=" << Pid;
+        if (ProcessName) {
+            out << "&_procces_name=" << *ProcessName;
+        }
+        out << "&lib_version=client_" << VersionPrefix << LibVersion();
+    }
+
+    TProcInfo TProcInfo::Create(const TString& versionPrefix) {
+        TProcInfo res;
+        res.Pid = IntToString<10>(GetPID());
+        res.ProcessName = GetProcessName();
+        res.VersionPrefix = versionPrefix;
+        return res;
+    }
+
+    std::optional<TString> TProcInfo::GetProcessName() {
+        try {
+            // works only for linux
+            TFileInput proc("/proc/self/status");
+
+            TString line;
+            while (proc.ReadLine(line)) {
+                TStringBuf buf(line);
+                if (!buf.SkipPrefix("Name:")) {
+                    continue;
+                }
+
+                while (buf && isspace(buf.front())) {
+                    buf.Skip(1);
+                }
+
+                TString res(buf);
+                CGIEscape(res);
+                return res;
+            }
+        } catch (...) {
+        }
+
+        return {};
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/proc_info.h b/library/cpp/tvmauth/client/misc/proc_info.h
new file mode 100644
index 0000000000..b1526e5c47
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/proc_info.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include <util/generic/string.h>
+
+#include <optional>
+
+namespace NTvmAuth::NUtils {
+    struct TProcInfo {
+        TString Pid;
+        std::optional<TString> ProcessName;
+        TString VersionPrefix;
+
+        void AddToRequest(IOutputStream& out) const;
+
+        static TProcInfo Create(const TString& versionPrefix);
+        static std::optional<TString> GetProcessName();
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/retry_settings/v1/settings.proto b/library/cpp/tvmauth/client/misc/retry_settings/v1/settings.proto
new file mode 100644
index 0000000000..72817847a6
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/retry_settings/v1/settings.proto
@@ -0,0 +1,21 @@
+syntax = "proto2";
+
+package retry_settings.v1;
+
+option cc_enable_arenas = true;
+option go_package = "a.yandex-team.ru/library/cpp/tvmauth/client/misc/retry_settings/v1";
+
+message Settings {
+    optional uint32 exponential_backoff_min_sec = 1;
+    optional uint32 exponential_backoff_max_sec = 2;
+    optional double exponential_backoff_factor = 3;
+    optional double exponential_backoff_jitter = 4;
+    optional uint32 max_random_sleep_default = 5;
+    optional uint32 max_random_sleep_when_ok = 12;
+    optional uint32 retries_on_start = 6;
+    optional uint32 worker_awaking_period_sec = 7;
+    optional uint32 dsts_limit = 8;
+    optional uint32 retries_in_background = 9;
+    optional uint32 roles_update_period_sec = 10;
+    optional uint32 roles_warn_period_sec = 11;
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/decoder.cpp b/library/cpp/tvmauth/client/misc/roles/decoder.cpp
new file mode 100644
index 0000000000..6337fb91c2
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/decoder.cpp
@@ -0,0 +1,93 @@
+#include "decoder.h"
+
+#include <library/cpp/tvmauth/client/misc/utils.h>
+
+#include <library/cpp/openssl/crypto/sha.h>
+#include <library/cpp/streams/brotli/brotli.h>
+#include <library/cpp/streams/zstd/zstd.h>
+
+#include <util/generic/yexception.h>
+#include <util/stream/zlib.h>
+#include <util/string/ascii.h>
+
+namespace NTvmAuth::NRoles {
+    TString TDecoder::Decode(const TStringBuf codec, TString&& blob) {
+        if (codec.empty()) {
+            return std::move(blob);
+        }
+
+        const TCodecInfo info = ParseCodec(codec);
+        TString decoded = DecodeImpl(info.Type, blob);
+
+        VerifySize(decoded, info.Size);
+        VerifyChecksum(decoded, info.Sha256);
+
+        return decoded;
+    }
+
+    TDecoder::TCodecInfo TDecoder::ParseCodec(TStringBuf codec) {
+        const char delim = ':';
+
+        const TStringBuf version = codec.NextTok(delim);
+        Y_ENSURE(version == "1",
+                 "unknown codec format version; known: 1; got: " << version);
+
+        TCodecInfo res;
+        res.Type = codec.NextTok(delim);
+        Y_ENSURE(res.Type, "codec type is empty");
+
+        const TStringBuf size = codec.NextTok(delim);
+        Y_ENSURE(TryIntFromString<10>(size, res.Size),
+                 "decoded blob size is not number");
+
+        res.Sha256 = codec;
+        const size_t expectedSha256Size = 2 * NOpenSsl::NSha256::DIGEST_LENGTH;
+        Y_ENSURE(res.Sha256.size() == expectedSha256Size,
+                 "sha256 of decoded blob has invalid length: expected "
+                     << expectedSha256Size << ", got " << res.Sha256.size());
+
+        return res;
+    }
+
+    TString TDecoder::DecodeImpl(TStringBuf codec, const TString& blob) {
+        if (AsciiEqualsIgnoreCase(codec, "brotli")) {
+            return DecodeBrolti(blob);
+        } else if (AsciiEqualsIgnoreCase(codec, "gzip")) {
+            return DecodeGzip(blob);
+        } else if (AsciiEqualsIgnoreCase(codec, "zstd")) {
+            return DecodeZstd(blob);
+        }
+
+        ythrow yexception() << "unknown codec: '" << codec << "'";
+    }
+
+    TString TDecoder::DecodeBrolti(const TString& blob) {
+        TStringInput in(blob);
+        return TBrotliDecompress(&in).ReadAll();
+    }
+
+    TString TDecoder::DecodeGzip(const TString& blob) {
+        TStringInput in(blob);
+        return TZLibDecompress(&in).ReadAll();
+    }
+
+    TString TDecoder::DecodeZstd(const TString& blob) {
+        TStringInput in(blob);
+        return TZstdDecompress(&in).ReadAll();
+    }
+
+    void TDecoder::VerifySize(const TStringBuf decoded, size_t expected) {
+        Y_ENSURE(expected == decoded.size(),
+                 "Decoded blob has bad size: expected " << expected << ", actual " << decoded.size());
+    }
+
+    void TDecoder::VerifyChecksum(const TStringBuf decoded, const TStringBuf expected) {
+        using namespace NOpenSsl::NSha256;
+
+        const TDigest dig = Calc(decoded);
+        const TString actual = NUtils::ToHex(TStringBuf((char*)dig.data(), dig.size()));
+
+        Y_ENSURE(AsciiEqualsIgnoreCase(actual, expected),
+                 "Decoded blob has bad sha256: expected=" << expected << ", actual=" << actual);
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/decoder.h b/library/cpp/tvmauth/client/misc/roles/decoder.h
new file mode 100644
index 0000000000..de5cdb37e0
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/decoder.h
@@ -0,0 +1,32 @@
+#pragma once
+
+#include <util/generic/string.h>
+
+namespace NTvmAuth::NRoles {
+    class TDecoder {
+    public:
+        static TString Decode(const TStringBuf codec, TString&& blob);
+
+    public:
+        struct TCodecInfo {
+            TStringBuf Type;
+            size_t Size = 0;
+            TStringBuf Sha256;
+
+            bool operator==(const TCodecInfo& o) const {
+                return Type == o.Type &&
+                       Size == o.Size &&
+                       Sha256 == o.Sha256;
+            }
+        };
+
+        static TCodecInfo ParseCodec(TStringBuf codec);
+        static TString DecodeImpl(TStringBuf codec, const TString& blob);
+        static TString DecodeBrolti(const TString& blob);
+        static TString DecodeGzip(const TString& blob);
+        static TString DecodeZstd(const TString& blob);
+
+        static void VerifySize(const TStringBuf decoded, size_t expected);
+        static void VerifyChecksum(const TStringBuf decoded, const TStringBuf expected);
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/entities_index.cpp b/library/cpp/tvmauth/client/misc/roles/entities_index.cpp
new file mode 100644
index 0000000000..c9b72c3a17
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/entities_index.cpp
@@ -0,0 +1,114 @@
+#include "entities_index.h"
+
+#include <util/stream/str.h>
+
+#include <set>
+
+namespace NTvmAuth::NRoles {
+    TEntitiesIndex::TStage::TStage(const std::set<TString>& k)
+        : Keys_(k.begin(), k.end())
+    {
+    }
+
+    // TODO TStringBuf
+    bool TEntitiesIndex::TStage::GetNextKeySet(std::vector<TString>& out) {
+        out.clear();
+        out.reserve(Keys_.size());
+
+        ++Id_;
+        for (size_t idx = 0; idx < Keys_.size(); ++idx) {
+            bool need = (Id_ >> idx) & 0x01;
+
+            if (need) {
+                out.push_back(Keys_[idx]);
+            }
+        }
+
+        return !out.empty();
+    }
+
+    TEntitiesIndex::TEntitiesIndex(const std::vector<TEntityPtr>& entities) {
+        const std::set<TString> uniqueKeys = GetUniqueSortedKeys(entities);
+        Idx_.Entities = entities;
+        Idx_.SubTree.reserve(uniqueKeys.size() * entities.size());
+
+        TStage stage(uniqueKeys);
+        std::vector<TString> keyset;
+        while (stage.GetNextKeySet(keyset)) {
+            for (const TEntityPtr& e : entities) {
+                TSubTree* currentBranch = &Idx_;
+
+                for (const TString& key : keyset) {
+                    auto it = e->find(key);
+                    if (it == e->end()) {
+                        continue;
+                    }
+
+                    auto [i, ok] = currentBranch->SubTree.emplace(
+                        TKeyValue{it->first, it->second},
+                        TSubTree());
+
+                    currentBranch = &i->second;
+                    currentBranch->Entities.push_back(e);
+                }
+            }
+        }
+
+        MakeUnique(Idx_);
+    }
+
+    std::set<TString> TEntitiesIndex::GetUniqueSortedKeys(const std::vector<TEntityPtr>& entities) {
+        std::set<TString> res;
+
+        for (const TEntityPtr& e : entities) {
+            for (const auto& [key, value] : *e) {
+                res.insert(key);
+            }
+        }
+
+        return res;
+    }
+
+    void TEntitiesIndex::MakeUnique(TSubTree& branch) {
+        auto& vec = branch.Entities;
+        std::sort(vec.begin(), vec.end());
+        vec.erase(std::unique(vec.begin(), vec.end()), vec.end());
+
+        for (auto& [_, restPart] : branch.SubTree) {
+            MakeUnique(restPart);
+        }
+    }
+
+    static void Print(const TEntitiesIndex::TSubTree& part, IOutputStream& out, size_t offset = 0) {
+        std::vector<std::pair<TKeyValue, const TEntitiesIndex::TSubTree*>> vec;
+        vec.reserve(part.SubTree.size());
+
+        for (const auto& [key, value] : part.SubTree) {
+            vec.push_back({key, &value});
+        }
+
+        std::sort(vec.begin(), vec.end(), [](const auto& l, const auto& r) {
+            if (l.first.Key < r.first.Key) {
+                return true;
+            }
+            if (l.first.Value < r.first.Value) {
+                return true;
+            }
+            return false;
+        });
+
+        for (const auto& [key, value] : vec) {
+            out << TString(offset, ' ') << "\"" << key.Key << "/" << key.Value << "\"" << Endl;
+            Print(*value, out, offset + 4);
+        }
+    }
+
+    TString TEntitiesIndex::PrintDebugString() const {
+        TStringStream res;
+        res << Endl;
+
+        Print(Idx_, res);
+
+        return res.Str();
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/entities_index.h b/library/cpp/tvmauth/client/misc/roles/entities_index.h
new file mode 100644
index 0000000000..bf42750d52
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/entities_index.h
@@ -0,0 +1,107 @@
+#pragma once
+
+#include "types.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <set>
+#include <vector>
+
+namespace NTvmAuth::NRoles {
+    class TEntitiesIndex: TMoveOnly {
+    public:
+        struct TSubTree;
+        using TIdxByAttrs = THashMap<TKeyValue, TSubTree>;
+
+        struct TSubTree {
+            std::vector<TEntityPtr> Entities;
+            TIdxByAttrs SubTree;
+        };
+
+        class TStage {
+        public:
+            TStage(const std::set<TString>& k);
+
+            bool GetNextKeySet(std::vector<TString>& out);
+
+        private:
+            std::vector<TString> Keys_;
+            size_t Id_ = 0;
+        };
+
+    public:
+        TEntitiesIndex(const std::vector<TEntityPtr>& entities);
+
+        /**
+         * Iterators must be to sorted unique key/value
+         */
+        template <typename Iterator>
+        bool ContainsExactEntity(Iterator begin, Iterator end) const;
+
+        /**
+         * Iterators must be to sorted unique key/value
+         */
+        template <typename Iterator>
+        const std::vector<TEntityPtr>& GetEntitiesWithAttrs(Iterator begin, Iterator end) const;
+
+    public: // for tests
+        static std::set<TString> GetUniqueSortedKeys(const std::vector<TEntityPtr>& entities);
+        static void MakeUnique(TEntitiesIndex::TSubTree& branch);
+
+        TString PrintDebugString() const;
+
+    private:
+        template <typename Iterator>
+        const TSubTree* FindSubtree(Iterator begin, Iterator end, size_t& size) const;
+
+    private:
+        TSubTree Idx_;
+        std::vector<TEntityPtr> EmptyResult_;
+    };
+
+    template <typename Iterator>
+    bool TEntitiesIndex::ContainsExactEntity(Iterator begin, Iterator end) const {
+        size_t size = 0;
+        const TSubTree* subtree = FindSubtree(begin, end, size);
+        if (!subtree) {
+            return false;
+        }
+
+        auto res = std::find_if(
+            subtree->Entities.begin(),
+            subtree->Entities.end(),
+            [size](const auto& e) { return size == e->size(); });
+        return res != subtree->Entities.end();
+    }
+
+    template <typename Iterator>
+    const std::vector<TEntityPtr>& TEntitiesIndex::GetEntitiesWithAttrs(Iterator begin, Iterator end) const {
+        size_t size = 0;
+        const TSubTree* subtree = FindSubtree(begin, end, size);
+        if (!subtree) {
+            return EmptyResult_;
+        }
+
+        return subtree->Entities;
+    }
+
+    template <typename Iterator>
+    const TEntitiesIndex::TSubTree* TEntitiesIndex::FindSubtree(Iterator begin,
+                                                                Iterator end,
+                                                                size_t& size) const {
+        const TSubTree* subtree = &Idx_;
+        size = 0;
+
+        for (auto attr = begin; attr != end; ++attr) {
+            auto it = subtree->SubTree.find(TKeyValueView{attr->first, attr->second});
+            if (it == subtree->SubTree.end()) {
+                return nullptr;
+            }
+
+            ++size;
+            subtree = &it->second;
+        }
+
+        return subtree;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/parser.cpp b/library/cpp/tvmauth/client/misc/roles/parser.cpp
new file mode 100644
index 0000000000..28faf4c057
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/parser.cpp
@@ -0,0 +1,149 @@
+#include "parser.h"
+
+#include <library/cpp/json/json_reader.h>
+
+#include <util/string/cast.h>
+
+namespace NTvmAuth::NRoles {
+    static void GetRequiredValue(const NJson::TJsonValue& doc,
+                                 TStringBuf key,
+                                 NJson::TJsonValue& obj) {
+        Y_ENSURE(doc.GetValue(key, &obj), "Missing '" << key << "'");
+    }
+
+    static ui64 GetRequiredUInt(const NJson::TJsonValue& doc,
+                                TStringBuf key) {
+        NJson::TJsonValue obj;
+        GetRequiredValue(doc, key, obj);
+        Y_ENSURE(obj.IsUInteger(), "key '" << key << "' must be uint");
+        return obj.GetUInteger();
+    }
+
+    static bool GetOptionalMap(const NJson::TJsonValue& doc,
+                               TStringBuf key,
+                               NJson::TJsonValue& obj) {
+        if (!doc.GetValue(key, &obj)) {
+            return false;
+        }
+
+        Y_ENSURE(obj.IsMap(), "'" << key << "' must be object");
+        return true;
+    }
+
+    TRolesPtr TParser::Parse(TRawPtr decodedBlob) {
+        try {
+            return ParseImpl(decodedBlob);
+        } catch (const std::exception& e) {
+            throw yexception() << "Failed to parse roles from tirole: " << e.what()
+                               << ". '" << *decodedBlob << "'";
+        }
+    }
+
+    TRolesPtr TParser::ParseImpl(TRawPtr decodedBlob) {
+        NJson::TJsonValue doc;
+        Y_ENSURE(NJson::ReadJsonTree(*decodedBlob, &doc), "Invalid json");
+        Y_ENSURE(doc.IsMap(), "Json must be object");
+
+        TRoles::TTvmConsumers tvm = GetConsumers<TTvmId>(doc, "tvm");
+        TRoles::TUserConsumers user = GetConsumers<TUid>(doc, "user");
+
+        // fetch it last to provide more correct apply instant
+        TRoles::TMeta meta = GetMeta(doc);
+
+        return std::make_shared<TRoles>(
+            std::move(meta),
+            std::move(tvm),
+            std::move(user),
+            std::move(decodedBlob));
+    }
+
+    TRoles::TMeta TParser::GetMeta(const NJson::TJsonValue& doc) {
+        TRoles::TMeta res;
+
+        NJson::TJsonValue obj;
+        GetRequiredValue(doc, "revision", obj);
+        if (obj.IsString()) {
+            res.Revision = obj.GetString();
+        } else if (obj.IsUInteger()) {
+            res.Revision = ToString(obj.GetUInteger());
+        } else {
+            ythrow yexception() << "'revision' has unexpected type: " << obj.GetType();
+        }
+
+        res.BornTime = TInstant::Seconds(GetRequiredUInt(doc, "born_date"));
+
+        return res;
+    }
+
+    template <typename Id>
+    THashMap<Id, TConsumerRolesPtr> TParser::GetConsumers(const NJson::TJsonValue& doc,
+                                                          TStringBuf type) {
+        THashMap<Id, TConsumerRolesPtr> res;
+
+        NJson::TJsonValue obj;
+        if (!GetOptionalMap(doc, type, obj)) {
+            return res;
+        }
+
+        for (const auto& [key, value] : obj.GetMap()) {
+            Y_ENSURE(value.IsMap(),
+                     "roles for consumer must be map: '" << key << "' is " << value.GetType());
+
+            Id id = 0;
+            Y_ENSURE(TryIntFromString<10>(key, id),
+                     "id must be valid positive number of proper size for "
+                         << type << ". got '"
+                         << key << "'");
+
+            Y_ENSURE(res.emplace(id, GetConsumer(value, key)).second,
+                     "consumer duplicate detected: '" << key << "' for " << type);
+        }
+
+        return res;
+    }
+
+    TConsumerRolesPtr TParser::GetConsumer(const NJson::TJsonValue& obj, TStringBuf consumer) {
+        TEntitiesByRoles entities;
+
+        for (const auto& [key, value] : obj.GetMap()) {
+            Y_ENSURE(value.IsArray(),
+                     "entities for roles must be array: '" << key << "' is " << value.GetType());
+
+            entities.emplace(key, GetEntities(value, consumer, key));
+        }
+
+        return std::make_shared<TConsumerRoles>(std::move(entities));
+    }
+
+    TEntitiesPtr TParser::GetEntities(const NJson::TJsonValue& obj,
+                                      TStringBuf consumer,
+                                      TStringBuf role) {
+        std::vector<TEntityPtr> entities;
+        entities.reserve(obj.GetArray().size());
+
+        for (const NJson::TJsonValue& e : obj.GetArray()) {
+            Y_ENSURE(e.IsMap(),
+                     "role entity for role must be map: consumer '"
+                         << consumer << "' with role '" << role << "' has " << e.GetType());
+
+            entities.push_back(GetEntity(e, consumer, role));
+        }
+
+        return std::make_shared<TEntities>(TEntities(entities));
+    }
+
+    TEntityPtr TParser::GetEntity(const NJson::TJsonValue& obj, TStringBuf consumer, TStringBuf role) {
+        TEntityPtr res = std::make_shared<TEntity>();
+
+        for (const auto& [key, value] : obj.GetMap()) {
+            Y_ENSURE(value.IsString(),
+                     "entity is map (str->str), got value "
+                         << value.GetType() << ". consumer '"
+                         << consumer << "' with role '" << role << "'");
+
+            res->emplace(key, value.GetString());
+        }
+
+        return res;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/parser.h b/library/cpp/tvmauth/client/misc/roles/parser.h
new file mode 100644
index 0000000000..0982ba78c6
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/parser.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include "roles.h"
+#include "types.h"
+
+namespace NJson {
+    class TJsonValue;
+}
+
+namespace NTvmAuth::NRoles {
+    class TParser {
+    public:
+        static TRolesPtr Parse(TRawPtr decodedBlob);
+
+    public:
+        static TRolesPtr ParseImpl(TRawPtr decodedBlob);
+        static TRoles::TMeta GetMeta(const NJson::TJsonValue& doc);
+
+        template <typename Id>
+        static THashMap<Id, TConsumerRolesPtr> GetConsumers(
+            const NJson::TJsonValue& doc,
+            TStringBuf key);
+
+        static TConsumerRolesPtr GetConsumer(
+            const NJson::TJsonValue& obj,
+            TStringBuf consumer);
+        static TEntitiesPtr GetEntities(
+            const NJson::TJsonValue& obj,
+            TStringBuf consumer,
+            TStringBuf role);
+        static TEntityPtr GetEntity(
+            const NJson::TJsonValue& obj,
+            TStringBuf consumer,
+            TStringBuf role);
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/roles.cpp b/library/cpp/tvmauth/client/misc/roles/roles.cpp
new file mode 100644
index 0000000000..0761033104
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/roles.cpp
@@ -0,0 +1,101 @@
+#include "roles.h"
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+
+namespace NTvmAuth::NRoles {
+    TRoles::TRoles(TMeta&& meta,
+                   TTvmConsumers tvm,
+                   TUserConsumers user,
+                   TRawPtr raw)
+        : Meta_(std::move(meta))
+        , TvmIds_(std::move(tvm))
+        , Users_(std::move(user))
+        , Raw_(std::move(raw))
+    {
+        Y_ENSURE(Raw_);
+    }
+
+    TConsumerRolesPtr TRoles::GetRolesForService(const TCheckedServiceTicket& t) const {
+        Y_ENSURE_EX(t,
+                    TIllegalUsage() << "Service ticket must be valid, got: " << t.GetStatus());
+        auto it = TvmIds_.find(t.GetSrc());
+        return it == TvmIds_.end() ? TConsumerRolesPtr() : it->second;
+    }
+
+    TConsumerRolesPtr TRoles::GetRolesForUser(const TCheckedUserTicket& t,
+                                              std::optional<TUid> selectedUid) const {
+        Y_ENSURE_EX(t,
+                    TIllegalUsage() << "User ticket must be valid, got: " << t.GetStatus());
+        Y_ENSURE_EX(t.GetEnv() == EBlackboxEnv::ProdYateam,
+                    TIllegalUsage() << "User ticket must be from ProdYateam, got from " << t.GetEnv());
+
+        TUid uid = t.GetDefaultUid();
+        if (selectedUid) {
+            auto it = std::find(t.GetUids().begin(), t.GetUids().end(), *selectedUid);
+            Y_ENSURE_EX(it != t.GetUids().end(),
+                        TIllegalUsage() << "selectedUid must be in user ticket but it's not: "
+                                        << *selectedUid);
+            uid = *selectedUid;
+        }
+
+        auto it = Users_.find(uid);
+        return it == Users_.end() ? TConsumerRolesPtr() : it->second;
+    }
+
+    const TRoles::TMeta& TRoles::GetMeta() const {
+        return Meta_;
+    }
+
+    const TString& TRoles::GetRaw() const {
+        return *Raw_;
+    }
+
+    bool TRoles::CheckServiceRole(const TCheckedServiceTicket& t,
+                                  const TStringBuf roleName) const {
+        TConsumerRolesPtr c = GetRolesForService(t);
+        return c ? c->HasRole(roleName) : false;
+    }
+
+    bool TRoles::CheckUserRole(const TCheckedUserTicket& t,
+                               const TStringBuf roleName,
+                               std::optional<TUid> selectedUid) const {
+        TConsumerRolesPtr c = GetRolesForUser(t, selectedUid);
+        return c ? c->HasRole(roleName) : false;
+    }
+
+    bool TRoles::CheckServiceRoleForExactEntity(const TCheckedServiceTicket& t,
+                                                const TStringBuf roleName,
+                                                const TEntity& exactEntity) const {
+        TConsumerRolesPtr c = GetRolesForService(t);
+        return c ? c->CheckRoleForExactEntity(roleName, exactEntity) : false;
+    }
+
+    bool TRoles::CheckUserRoleForExactEntity(const TCheckedUserTicket& t,
+                                             const TStringBuf roleName,
+                                             const TEntity& exactEntity,
+                                             std::optional<TUid> selectedUid) const {
+        TConsumerRolesPtr c = GetRolesForUser(t, selectedUid);
+        return c ? c->CheckRoleForExactEntity(roleName, exactEntity) : false;
+    }
+
+    TConsumerRoles::TConsumerRoles(TEntitiesByRoles roles)
+        : Roles_(std::move(roles))
+    {
+    }
+
+    bool TConsumerRoles::CheckRoleForExactEntity(const TStringBuf roleName,
+                                                 const TEntity& exactEntity) const {
+        auto it = Roles_.find(roleName);
+        if (it == Roles_.end()) {
+            return false;
+        }
+
+        return it->second->Contains(exactEntity);
+    }
+
+    TEntities::TEntities(TEntitiesIndex idx)
+        : Idx_(std::move(idx))
+    {
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/roles.h b/library/cpp/tvmauth/client/misc/roles/roles.h
new file mode 100644
index 0000000000..6d510ee8a1
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/roles.h
@@ -0,0 +1,186 @@
+#pragma once
+
+#include "entities_index.h"
+#include "types.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/type.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/array_ref.h>
+#include <util/generic/hash.h>
+
+#include <vector>
+
+namespace NTvmAuth {
+    class TCheckedServiceTicket;
+    class TCheckedUserTicket;
+}
+
+namespace NTvmAuth::NRoles {
+    class TRoles {
+    public:
+        struct TMeta {
+            TString Revision;
+            TInstant BornTime;
+            TInstant Applied = TInstant::Now();
+        };
+
+        using TTvmConsumers = THashMap<TTvmId, TConsumerRolesPtr>;
+        using TUserConsumers = THashMap<TUid, TConsumerRolesPtr>;
+
+        TRoles(TMeta&& meta,
+               TTvmConsumers tvm,
+               TUserConsumers user,
+               TRawPtr raw);
+
+        /**
+         * @return ptr to roles. It will be nullptr if there are no roles
+         */
+        TConsumerRolesPtr GetRolesForService(const TCheckedServiceTicket& t) const;
+
+        /**
+         * @return ptr to roles. It will be nullptr if there are no roles
+         */
+        TConsumerRolesPtr GetRolesForUser(const TCheckedUserTicket& t,
+                                          std::optional<TUid> selectedUid = {}) const;
+
+        const TMeta& GetMeta() const;
+        const TString& GetRaw() const;
+
+    public: // shortcuts
+        /**
+         * @brief CheckServiceRole() is shortcut for simple role checking - for any possible entity
+         */
+        bool CheckServiceRole(
+            const TCheckedServiceTicket& t,
+            const TStringBuf roleName) const;
+
+        /**
+         * @brief CheckUserRole() is shortcut for simple role checking - for any possible entity
+         */
+        bool CheckUserRole(
+            const TCheckedUserTicket& t,
+            const TStringBuf roleName,
+            std::optional<TUid> selectedUid = {}) const;
+
+        /**
+         * @brief CheckServiceRoleForExactEntity() is shortcut for simple role checking for exact entity
+         */
+        bool CheckServiceRoleForExactEntity(
+            const TCheckedServiceTicket& t,
+            const TStringBuf roleName,
+            const TEntity& exactEntity) const;
+
+        /**
+         * @brief CheckUserRoleForExactEntity() is shortcut for simple role checking for exact entity
+         */
+        bool CheckUserRoleForExactEntity(
+            const TCheckedUserTicket& t,
+            const TStringBuf roleName,
+            const TEntity& exactEntity,
+            std::optional<TUid> selectedUid = {}) const;
+
+    private:
+        TMeta Meta_;
+        TTvmConsumers TvmIds_;
+        TUserConsumers Users_;
+        TRawPtr Raw_;
+    };
+
+    class TConsumerRoles {
+    public:
+        TConsumerRoles(TEntitiesByRoles roles);
+
+        bool HasRole(const TStringBuf roleName) const {
+            return Roles_.contains(roleName);
+        }
+
+        const TEntitiesByRoles& GetRoles() const {
+            return Roles_;
+        }
+
+        /**
+         * @return ptr to entries. It will be nullptr if there is no role
+         */
+        TEntitiesPtr GetEntitiesForRole(const TStringBuf roleName) const {
+            auto it = Roles_.find(roleName);
+            return it == Roles_.end() ? TEntitiesPtr() : it->second;
+        }
+
+        /**
+         * @brief CheckRoleForExactEntity() is shortcut for simple role checking for exact entity
+         */
+        bool CheckRoleForExactEntity(const TStringBuf roleName,
+                                     const TEntity& exactEntity) const;
+
+    private:
+        TEntitiesByRoles Roles_;
+    };
+
+    class TEntities {
+    public:
+        TEntities(TEntitiesIndex idx);
+
+        /**
+         * @brief Contains() provides info about entity presence
+         */
+        bool Contains(const TEntity& exactEntity) const {
+            return Idx_.ContainsExactEntity(exactEntity.begin(), exactEntity.end());
+        }
+
+        /**
+         * @brief The same as Contains()
+         * It checks span for sorted and unique properties.
+         */
+        template <class StrKey = TString, class StrValue = TString>
+        bool ContainsSortedUnique(
+            const TArrayRef<const std::pair<StrKey, StrValue>>& exactEntity) const {
+            CheckSpan(exactEntity);
+            return Idx_.ContainsExactEntity(exactEntity.begin(), exactEntity.end());
+        }
+
+        /**
+         * @brief GetEntitiesWithAttrs() collects entities with ALL attributes from `attrs`
+         */
+        template <class StrKey = TString, class StrValue = TString>
+        const std::vector<TEntityPtr>& GetEntitiesWithAttrs(
+            const std::map<StrKey, StrValue>& attrs) const {
+            return Idx_.GetEntitiesWithAttrs(attrs.begin(), attrs.end());
+        }
+
+        /**
+         * @brief The same as GetEntitiesWithAttrs()
+         * It checks span for sorted and unique properties.
+         */
+        template <class StrKey = TString, class StrValue = TString>
+        const std::vector<TEntityPtr>& GetEntitiesWithSortedUniqueAttrs(
+            const TArrayRef<const std::pair<StrKey, StrValue>>& attrs) const {
+            CheckSpan(attrs);
+            return Idx_.GetEntitiesWithAttrs(attrs.begin(), attrs.end());
+        }
+
+    private:
+        template <class StrKey, class StrValue>
+        static void CheckSpan(const TArrayRef<const std::pair<StrKey, StrValue>>& attrs) {
+            if (attrs.empty()) {
+                return;
+            }
+
+            auto prev = attrs.begin();
+            for (auto it = prev + 1; it != attrs.end(); ++it) {
+                Y_ENSURE_EX(prev->first != it->first,
+                            TIllegalUsage() << "attrs are not unique: '" << it->first << "'");
+                Y_ENSURE_EX(prev->first < it->first,
+                            TIllegalUsage() << "attrs are not sorted: '" << prev->first
+                                            << "' before '" << it->first << "'");
+
+                prev = it;
+            }
+        }
+
+    private:
+        TEntitiesIndex Idx_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/types.h b/library/cpp/tvmauth/client/misc/roles/types.h
new file mode 100644
index 0000000000..de0745e72e
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/types.h
@@ -0,0 +1,70 @@
+#pragma once
+
+#include <util/generic/hash_set.h>
+
+#include <map>
+#include <memory>
+
+namespace NTvmAuth::NRoles {
+    using TEntity = std::map<TString, TString>;
+    using TEntityPtr = std::shared_ptr<TEntity>;
+
+    class TEntities;
+    using TEntitiesPtr = std::shared_ptr<TEntities>;
+
+    using TEntitiesByRoles = THashMap<TString, TEntitiesPtr>;
+
+    class TConsumerRoles;
+    using TConsumerRolesPtr = std::shared_ptr<TConsumerRoles>;
+
+    class TRoles;
+    using TRolesPtr = std::shared_ptr<TRoles>;
+
+    using TRawPtr = std::shared_ptr<TString>;
+
+    template <class T>
+    struct TKeyValueBase {
+        T Key;
+        T Value;
+
+        template <typename U>
+        bool operator==(const TKeyValueBase<U>& o) const {
+            return Key == o.Key && Value == o.Value;
+        }
+    };
+
+    using TKeyValue = TKeyValueBase<TString>;
+    using TKeyValueView = TKeyValueBase<TStringBuf>;
+}
+
+// Traits
+
+template <>
+struct THash<NTvmAuth::NRoles::TKeyValue> {
+    std::size_t operator()(const NTvmAuth::NRoles::TKeyValue& e) const {
+        return std::hash<std::string_view>()(e.Key) + std::hash<std::string_view>()(e.Value);
+    }
+
+    std::size_t operator()(const NTvmAuth::NRoles::TKeyValueView& e) const {
+        return std::hash<std::string_view>()(e.Key) + std::hash<std::string_view>()(e.Value);
+    }
+};
+
+template <>
+struct TEqualTo<NTvmAuth::NRoles::TKeyValue> {
+    using is_transparent = std::true_type;
+
+    template <typename T, typename U>
+    bool operator()(const NTvmAuth::NRoles::TKeyValueBase<T>& l,
+                    const NTvmAuth::NRoles::TKeyValueBase<U>& r) {
+        return l == r;
+    }
+};
+
+inline bool operator<(const NTvmAuth::NRoles::TEntityPtr& l, const NTvmAuth::NRoles::TEntityPtr& r) {
+    return *l < *r;
+}
+
+inline bool operator==(const NTvmAuth::NRoles::TEntityPtr& l, const NTvmAuth::NRoles::TEntityPtr& r) {
+    return *l == *r;
+}
diff --git a/library/cpp/tvmauth/client/misc/service_tickets.h b/library/cpp/tvmauth/client/misc/service_tickets.h
new file mode 100644
index 0000000000..6a24bd5689
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/service_tickets.h
@@ -0,0 +1,86 @@
+#pragma once
+
+#include "settings.h"
+#include "roles/roles.h"
+
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/hash.h>
+#include <util/generic/maybe.h>
+#include <util/generic/noncopyable.h>
+#include <util/generic/ptr.h>
+
+namespace NTvmAuth::NInternal {
+    class TClientCaningKnife;
+}
+
+namespace NTvmAuth {
+    class TServiceTickets: public TAtomicRefCount<TServiceTickets> {
+    public:
+        using TMapAliasStr = THashMap<TClientSettings::TAlias, TString>;
+        using TMapIdStr = THashMap<TTvmId, TString>;
+        using TIdSet = THashSet<TTvmId>;
+        using TAliasSet = THashSet<TClientSettings::TAlias>;
+        using TMapAliasId = THashMap<TClientSettings::TAlias, TTvmId>;
+
+        TServiceTickets(TMapIdStr&& tickets, TMapIdStr&& errors, const TMapAliasId& dstMap)
+            : TicketsById(std::move(tickets))
+            , ErrorsById(std::move(errors))
+        {
+            InitAliasesAndUnfetchedIds(dstMap);
+            InitInvalidationTime();
+        }
+
+        static TInstant GetInvalidationTime(const TMapIdStr& ticketsById) {
+            TInstant res;
+
+            for (const auto& pair : ticketsById) {
+                TMaybe<TInstant> t = NTvmAuth::NInternal::TCanningKnife::GetExpirationTime(pair.second);
+                if (!t) {
+                    continue;
+                }
+
+                res = res == TInstant() ? *t : std::min(res, *t);
+            }
+
+            return res;
+        }
+
+    public:
+        TMapIdStr TicketsById;
+        TMapIdStr ErrorsById;
+        TMapAliasStr TicketsByAlias;
+        TMapAliasStr ErrorsByAlias;
+        TInstant InvalidationTime;
+        TIdSet UnfetchedIds;
+        TAliasSet UnfetchedAliases;
+
+    private:
+        void InitAliasesAndUnfetchedIds(const TMapAliasId& dstMap) {
+            for (const auto& pair : dstMap) {
+                auto it = TicketsById.find(pair.second);
+                auto errIt = ErrorsById.find(pair.second);
+
+                if (it == TicketsById.end()) {
+                    if (errIt != ErrorsById.end()) {
+                        Y_ENSURE(ErrorsByAlias.insert({pair.first, errIt->second}).second,
+                                 "failed to add: " << pair.first);
+                    } else {
+                        UnfetchedAliases.insert(pair.first);
+                        UnfetchedIds.insert(pair.second);
+                    }
+                } else {
+                    Y_ENSURE(TicketsByAlias.insert({pair.first, it->second}).second,
+                             "failed to add: " << pair.first);
+                }
+            }
+        }
+
+        void InitInvalidationTime() {
+            InvalidationTime = GetInvalidationTime(TicketsById);
+        }
+    };
+
+    using TServiceTicketsPtr = TIntrusiveConstPtr<TServiceTickets>;
+}
diff --git a/library/cpp/tvmauth/client/misc/settings.h b/library/cpp/tvmauth/client/misc/settings.h
new file mode 100644
index 0000000000..8fae6c34d3
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/settings.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <util/generic/fwd.h>
+
+namespace NTvmAuth {
+    class TClientSettings {
+    public:
+        /*!
+         * Look at description in relevant settings: NTvmApi::TClientSettings or NTvmTool::TClientSettings
+         */
+        using TAlias = TString;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/src_checker.h b/library/cpp/tvmauth/client/misc/src_checker.h
new file mode 100644
index 0000000000..bb99fe8884
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/src_checker.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include "roles/roles.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+#include <library/cpp/tvmauth/src/service_impl.h>
+#include <library/cpp/tvmauth/src/utils.h>
+
+namespace NTvmAuth {
+    class TSrcChecker {
+    public:
+        /*!
+         * Checking must be enabled in TClientSettings
+         * Can throw exception if cache is out of date or wrong config
+         * @param ticket
+         */
+        static TCheckedServiceTicket Check(TCheckedServiceTicket ticket, NRoles::TRolesPtr r) {
+            Y_ENSURE_EX(r, TBrokenTvmClientSettings() << "Need to use TClientSettings::EnableRolesFetching()");
+            NRoles::TConsumerRolesPtr roles = r->GetRolesForService(ticket);
+            if (roles) {
+                return ticket;
+            }
+
+            TServiceTicketImplPtr impl = THolder(NInternal::TCanningKnife::GetS(ticket));
+            impl->SetStatus(ETicketStatus::NoRoles);
+            return TCheckedServiceTicket(std::move(impl));
+        }
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/threaded_updater.cpp b/library/cpp/tvmauth/client/misc/threaded_updater.cpp
new file mode 100644
index 0000000000..5d21ce67a7
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/threaded_updater.cpp
@@ -0,0 +1,111 @@
+#include "threaded_updater.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <util/string/builder.h>
+#include <util/system/spin_wait.h>
+#include <util/system/thread.h>
+
+namespace NTvmAuth {
+    TThreadedUpdaterBase::TThreadedUpdaterBase(TDuration workerAwakingPeriod,
+                                               TLoggerPtr logger,
+                                               const TString& url,
+                                               ui16 port,
+                                               TDuration socketTimeout,
+                                               TDuration connectTimeout)
+        : WorkerAwakingPeriod_(workerAwakingPeriod)
+        , Logger_(std::move(logger))
+        , TvmUrl_(url)
+        , TvmPort_(port)
+        , TvmSocketTimeout_(socketTimeout)
+        , TvmConnectTimeout_(connectTimeout)
+        , IsStopped_(true)
+    {
+        Y_ENSURE_EX(Logger_, TNonRetriableException() << "Logger is required");
+
+        ServiceTicketsDurations_.RefreshPeriod = TDuration::Hours(1);
+        ServiceTicketsDurations_.Expiring = TDuration::Hours(2);
+        ServiceTicketsDurations_.Invalid = TDuration::Hours(11);
+
+        PublicKeysDurations_.RefreshPeriod = TDuration::Days(1);
+        PublicKeysDurations_.Expiring = TDuration::Days(2);
+        PublicKeysDurations_.Invalid = TDuration::Days(6);
+    }
+
+    TThreadedUpdaterBase::~TThreadedUpdaterBase() {
+        StopWorker();
+    }
+
+    void TThreadedUpdaterBase::StartWorker() {
+        if (HttpClient_) {
+            HttpClient_->ResetConnection();
+        }
+        Thread_ = MakeHolder<TThread>(WorkerWrap, this);
+        Thread_->Start();
+        Started_.Wait();
+        IsStopped_ = false;
+    }
+
+    void TThreadedUpdaterBase::StopWorker() {
+        Event_.Signal();
+        if (Thread_) {
+            Thread_.Reset();
+        }
+    }
+
+    TKeepAliveHttpClient& TThreadedUpdaterBase::GetClient() const {
+        if (!HttpClient_) {
+            HttpClient_ = MakeHolder<TKeepAliveHttpClient>(TvmUrl_, TvmPort_, TvmSocketTimeout_, TvmConnectTimeout_);
+        }
+
+        return *HttpClient_;
+    }
+
+    void TThreadedUpdaterBase::LogDebug(const TString& msg) const {
+        if (Logger_) {
+            Logger_->Debug(msg);
+        }
+    }
+
+    void TThreadedUpdaterBase::LogInfo(const TString& msg) const {
+        if (Logger_) {
+            Logger_->Info(msg);
+        }
+    }
+
+    void TThreadedUpdaterBase::LogWarning(const TString& msg) const {
+        if (Logger_) {
+            Logger_->Warning(msg);
+        }
+    }
+
+    void TThreadedUpdaterBase::LogError(const TString& msg) const {
+        if (Logger_) {
+            Logger_->Error(msg);
+        }
+    }
+
+    void* TThreadedUpdaterBase::WorkerWrap(void* arg) {
+        TThread::SetCurrentThreadName("TicketParserUpd");
+        TThreadedUpdaterBase& this_ = *reinterpret_cast<TThreadedUpdaterBase*>(arg);
+        this_.Started_.Signal();
+        this_.LogDebug("Thread-worker started");
+
+        while (true) {
+            if (this_.Event_.WaitT(this_.WorkerAwakingPeriod_)) {
+                break;
+            }
+
+            try {
+                this_.Worker();
+                this_.GetClient().ResetConnection();
+            } catch (const std::exception& e) { // impossible now
+                this_.LogError(TStringBuilder() << "Failed to generate new cache: " << e.what());
+            }
+        }
+
+        this_.LogDebug("Thread-worker stopped");
+        this_.IsStopped_ = true;
+        return nullptr;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/threaded_updater.h b/library/cpp/tvmauth/client/misc/threaded_updater.h
new file mode 100644
index 0000000000..783684ba3b
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/threaded_updater.h
@@ -0,0 +1,76 @@
+#pragma once
+
+#include "async_updater.h"
+#include "settings.h"
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/http/simple/http_client.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/ptr.h>
+#include <util/system/event.h>
+#include <util/system/thread.h>
+
+class TKeepAliveHttpClient;
+
+namespace NTvmAuth::NInternal {
+    class TClientCaningKnife;
+}
+namespace NTvmAuth {
+    class TThreadedUpdaterBase: public TAsyncUpdaterBase {
+    public:
+        TThreadedUpdaterBase(TDuration workerAwakingPeriod,
+                             TLoggerPtr logger,
+                             const TString& url,
+                             ui16 port,
+                             TDuration socketTimeout,
+                             TDuration connectTimeout);
+        virtual ~TThreadedUpdaterBase();
+
+    protected:
+        void StartWorker();
+        void StopWorker();
+
+        virtual void Worker() {
+        }
+
+        TKeepAliveHttpClient& GetClient() const;
+
+        void LogDebug(const TString& msg) const;
+        void LogInfo(const TString& msg) const;
+        void LogWarning(const TString& msg) const;
+        void LogError(const TString& msg) const;
+
+    protected:
+        TDuration WorkerAwakingPeriod_;
+
+        const TLoggerPtr Logger_;
+
+    protected:
+        const TString TvmUrl_;
+
+    private:
+        static void* WorkerWrap(void* arg);
+
+        void StartTvmClientStopping() const override {
+            Event_.Signal();
+        }
+
+        bool IsTvmClientStopped() const override {
+            return IsStopped_;
+        }
+
+    private:
+        mutable THolder<TKeepAliveHttpClient> HttpClient_;
+
+        const ui32 TvmPort_;
+        const TDuration TvmSocketTimeout_;
+        const TDuration TvmConnectTimeout_;
+
+        mutable TAutoEvent Event_;
+        mutable TAutoEvent Started_;
+        std::atomic_bool IsStopped_;
+        THolder<TThread> Thread_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/meta_info.cpp b/library/cpp/tvmauth/client/misc/tool/meta_info.cpp
new file mode 100644
index 0000000000..9a0ae228fe
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/meta_info.cpp
@@ -0,0 +1,208 @@
+#include "meta_info.h"
+
+#include <library/cpp/json/json_reader.h>
+
+#include <util/string/builder.h>
+
+namespace NTvmAuth::NTvmTool {
+    TString TMetaInfo::TConfig::ToString() const {
+        TStringStream s;
+        s << "self_tvm_id=" << SelfTvmId << ", "
+          << "bb_env=" << BbEnv << ", "
+          << "idm_slug=" << (IdmSlug ? IdmSlug : "<NULL>") << ", "
+          << "dsts=[";
+
+        for (const auto& pair : DstAliases) {
+            s << "(" << pair.first << ":" << pair.second << ")";
+        }
+
+        s << "]";
+
+        return std::move(s.Str());
+    }
+
+    TMetaInfo::TMetaInfo(TLoggerPtr logger)
+        : Logger_(std::move(logger))
+    {
+    }
+
+    TMetaInfo::TConfigPtr TMetaInfo::Init(TKeepAliveHttpClient& client,
+                                          const TClientSettings& settings) {
+        ApplySettings(settings);
+
+        TryPing(client);
+        const TString metaString = Fetch(client);
+        if (Logger_) {
+            TStringStream s;
+            s << "Meta info fetched from " << settings.GetHostname() << ":" << settings.GetPort();
+            Logger_->Debug(s.Str());
+        }
+
+        try {
+            Config_.Set(ParseMetaString(metaString, SelfAlias_));
+        } catch (const yexception& e) {
+            ythrow TNonRetriableException() << "Malformed json from tvmtool: " << e.what();
+        }
+        TConfigPtr cfg = Config_.Get();
+        Y_ENSURE_EX(cfg, TNonRetriableException() << "Alias '" << SelfAlias_ << "' not found in meta info");
+
+        if (Logger_) {
+            Logger_->Info("Meta: " + cfg->ToString());
+        }
+
+        return cfg;
+    }
+
+    TString TMetaInfo::GetRequestForTickets(const TConfig& config) {
+        Y_ENSURE(!config.DstAliases.empty());
+
+        TStringStream s;
+        s << "/tvm/tickets"
+          << "?src=" << config.SelfTvmId
+          << "&dsts=";
+
+        for (const auto& pair : config.DstAliases) {
+            s << pair.second << ","; // avoid aliases - url-encoding required
+        }
+        s.Str().pop_back();
+
+        return s.Str();
+    }
+
+    bool TMetaInfo::TryUpdateConfig(TKeepAliveHttpClient& client) {
+        const TString metaString = Fetch(client);
+
+        TConfigPtr config;
+        try {
+            config = ParseMetaString(metaString, SelfAlias_);
+        } catch (const yexception& e) {
+            ythrow TNonRetriableException() << "Malformed json from tvmtool: " << e.what();
+        }
+        Y_ENSURE_EX(config, TNonRetriableException() << "Alias '" << SelfAlias_ << "' not found in meta info");
+
+        TConfigPtr oldConfig = Config_.Get();
+        if (*config == *oldConfig) {
+            return false;
+        }
+
+        if (Logger_) {
+            Logger_->Info(TStringBuilder()
+                          << "Meta was updated. Old: (" << oldConfig->ToString()
+                          << "). New: (" << config->ToString() << ")");
+        }
+
+        Config_ = config;
+        return true;
+    }
+
+    void TMetaInfo::TryPing(TKeepAliveHttpClient& client) {
+        try {
+            TStringStream s;
+            TKeepAliveHttpClient::THttpCode code = client.DoGet("/tvm/ping", &s);
+            if (code < 200 || 300 <= code) {
+                throw yexception() << "(" << code << ") " << s.Str();
+            }
+        } catch (const std::exception& e) {
+            ythrow TNonRetriableException() << "Failed to connect to tvmtool: " << e.what();
+        }
+    }
+
+    TString TMetaInfo::Fetch(TKeepAliveHttpClient& client) const {
+        TStringStream res;
+        TKeepAliveHttpClient::THttpCode code;
+        try {
+            code = client.DoGet("/tvm/private_api/__meta__", &res, AuthHeader_);
+        } catch (const std::exception& e) {
+            ythrow TRetriableException() << "Failed to fetch meta data from tvmtool: " << e.what();
+        }
+
+        if (code != 200) {
+            Y_ENSURE_EX(code != 404,
+                        TNonRetriableException() << "Library does not support so old tvmtool. You need tvmtool>=1.1.0");
+
+            TStringStream err;
+            err << "Failed to fetch meta from tvmtool: " << client.GetHost() << ":" << client.GetPort()
+                << " (" << code << "): " << res.Str();
+            Y_ENSURE_EX(!(500 <= code && code < 600), TRetriableException() << err.Str());
+            ythrow TNonRetriableException() << err.Str();
+        }
+
+        return res.Str();
+    }
+
+    static TMetaInfo::TDstAliases::value_type ParsePair(const NJson::TJsonValue& val, const TString& meta) {
+        NJson::TJsonValue jAlias;
+        Y_ENSURE(val.GetValue("alias", &jAlias), meta);
+        Y_ENSURE(jAlias.IsString(), meta);
+
+        NJson::TJsonValue jClientId;
+        Y_ENSURE(val.GetValue("client_id", &jClientId), meta);
+        Y_ENSURE(jClientId.IsInteger(), meta);
+
+        return {jAlias.GetString(), jClientId.GetInteger()};
+    }
+
+    TMetaInfo::TConfigPtr TMetaInfo::ParseMetaString(const TString& meta, const TString& self) {
+        NJson::TJsonValue jDoc;
+        Y_ENSURE(NJson::ReadJsonTree(meta, &jDoc), meta);
+
+        NJson::TJsonValue jEnv;
+        Y_ENSURE(jDoc.GetValue("bb_env", &jEnv), meta);
+
+        NJson::TJsonValue jTenants;
+        Y_ENSURE(jDoc.GetValue("tenants", &jTenants), meta);
+        Y_ENSURE(jTenants.IsArray(), meta);
+
+        for (const NJson::TJsonValue& jTen : jTenants.GetArray()) {
+            NJson::TJsonValue jSelf;
+            Y_ENSURE(jTen.GetValue("self", &jSelf), meta);
+            auto selfPair = ParsePair(jSelf, meta);
+            if (selfPair.first != self) {
+                continue;
+            }
+
+            TConfigPtr config = std::make_shared<TConfig>();
+            config->SelfTvmId = selfPair.second;
+            config->BbEnv = BbEnvFromString(jEnv.GetString(), meta);
+
+            {
+                NJson::TJsonValue jSlug;
+                if (jTen.GetValue("idm_slug", &jSlug)) {
+                    config->IdmSlug = jSlug.GetString();
+                }
+            }
+
+            NJson::TJsonValue jDsts;
+            Y_ENSURE(jTen.GetValue("dsts", &jDsts), meta);
+            Y_ENSURE(jDsts.IsArray(), meta);
+            for (const NJson::TJsonValue& jDst : jDsts.GetArray()) {
+                config->DstAliases.insert(ParsePair(jDst, meta));
+            }
+
+            return config;
+        }
+
+        return {};
+    }
+
+    void TMetaInfo::ApplySettings(const TClientSettings& settings) {
+        AuthHeader_ = {{"Authorization", settings.GetAuthToken()}};
+        SelfAlias_ = settings.GetSelfAlias();
+    }
+
+    EBlackboxEnv TMetaInfo::BbEnvFromString(const TString& env, const TString& meta) {
+        if (env == "Prod") {
+            return EBlackboxEnv::Prod;
+        } else if (env == "Test") {
+            return EBlackboxEnv::Test;
+        } else if (env == "ProdYaTeam") {
+            return EBlackboxEnv::ProdYateam;
+        } else if (env == "TestYaTeam") {
+            return EBlackboxEnv::TestYateam;
+        } else if (env == "Stress") {
+            return EBlackboxEnv::Stress;
+        }
+
+        ythrow yexception() << "'bb_env'=='" << env << "'. " << meta;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/meta_info.h b/library/cpp/tvmauth/client/misc/tool/meta_info.h
new file mode 100644
index 0000000000..9dd4f0dbf8
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/meta_info.h
@@ -0,0 +1,69 @@
+#pragma once
+
+#include "settings.h"
+
+#include <library/cpp/tvmauth/client/misc/utils.h>
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/http/simple/http_client.h>
+
+namespace NTvmAuth::NTvmTool {
+    class TMetaInfo {
+    public:
+        using TDstAliases = THashMap<TClientSettings::TAlias, TTvmId>;
+
+        struct TConfig {
+            TTvmId SelfTvmId = 0;
+            EBlackboxEnv BbEnv = EBlackboxEnv::Prod;
+            TString IdmSlug;
+            TDstAliases DstAliases;
+
+            bool AreTicketsRequired() const {
+                return !DstAliases.empty();
+            }
+
+            TString ToString() const;
+
+            bool operator==(const TConfig& c) const {
+                return SelfTvmId == c.SelfTvmId &&
+                       BbEnv == c.BbEnv &&
+                       IdmSlug == c.IdmSlug &&
+                       DstAliases == c.DstAliases;
+            }
+        };
+        using TConfigPtr = std::shared_ptr<TConfig>;
+
+    public:
+        TMetaInfo(TLoggerPtr logger);
+
+        TConfigPtr Init(TKeepAliveHttpClient& client,
+                        const TClientSettings& settings);
+
+        static TString GetRequestForTickets(const TMetaInfo::TConfig& config);
+
+        const TKeepAliveHttpClient::THeaders& GetAuthHeader() const {
+            return AuthHeader_;
+        }
+
+        TConfigPtr GetConfig() const {
+            return Config_.Get();
+        }
+
+        bool TryUpdateConfig(TKeepAliveHttpClient& client);
+
+    protected:
+        void TryPing(TKeepAliveHttpClient& client);
+        TString Fetch(TKeepAliveHttpClient& client) const;
+        static TConfigPtr ParseMetaString(const TString& meta, const TString& self);
+        void ApplySettings(const TClientSettings& settings);
+        static EBlackboxEnv BbEnvFromString(const TString& env, const TString& meta);
+
+    protected:
+        NUtils::TProtectedValue<TConfigPtr> Config_;
+        TKeepAliveHttpClient::THeaders AuthHeader_;
+
+        TLoggerPtr Logger_;
+        TString SelfAlias_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/roles_fetcher.cpp b/library/cpp/tvmauth/client/misc/tool/roles_fetcher.cpp
new file mode 100644
index 0000000000..05b0856edc
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/roles_fetcher.cpp
@@ -0,0 +1,81 @@
+#include "roles_fetcher.h"
+
+#include <library/cpp/tvmauth/client/misc/roles/parser.h>
+
+#include <library/cpp/http/misc/httpcodes.h>
+#include <library/cpp/string_utils/quote/quote.h>
+
+#include <util/string/builder.h>
+#include <util/string/join.h>
+
+namespace NTvmAuth::NTvmTool {
+    TRolesFetcher::TRolesFetcher(const TRolesFetcherSettings& settings, TLoggerPtr logger)
+        : Settings_(settings)
+        , Logger_(std::move(logger))
+    {
+    }
+
+    bool TRolesFetcher::IsTimeToUpdate(TDuration sinceUpdate) const {
+        return Settings_.UpdatePeriod < sinceUpdate;
+    }
+
+    bool TRolesFetcher::ShouldWarn(TDuration sinceUpdate) const {
+        return Settings_.WarnPeriod < sinceUpdate;
+    }
+
+    bool TRolesFetcher::AreRolesOk() const {
+        return bool(GetCurrentRoles());
+    }
+
+    NUtils::TFetchResult TRolesFetcher::FetchActualRoles(const TKeepAliveHttpClient::THeaders& authHeader,
+                                                         TKeepAliveHttpClient& client) const {
+        const TRequest req = CreateRequest(authHeader);
+
+        TStringStream out;
+        THttpHeaders outHeaders;
+
+        TKeepAliveHttpClient::THttpCode code = client.DoGet(
+            req.Url,
+            &out,
+            req.Headers,
+            &outHeaders);
+
+        return {code, std::move(outHeaders), "/v2/roles", out.Str(), {}};
+    }
+
+    void TRolesFetcher::Update(NUtils::TFetchResult&& fetchResult) {
+        if (fetchResult.Code == HTTP_NOT_MODIFIED) {
+            Y_ENSURE(CurrentRoles_.Get(),
+                     "tvmtool did not return any roles because current roles are actual,"
+                     " but there are no roles in memory - this should never happen");
+            return;
+        }
+
+        Y_ENSURE(fetchResult.Code == HTTP_OK,
+                 "Unexpected code from tvmtool: " << fetchResult.Code << ". " << fetchResult.Response);
+
+        CurrentRoles_.Set(NRoles::TParser::Parse(std::make_shared<TString>(std::move(fetchResult.Response))));
+
+        Logger_->Debug(
+            TStringBuilder() << "Succeed to update roles with revision "
+                             << CurrentRoles_.Get()->GetMeta().Revision);
+    }
+
+    NTvmAuth::NRoles::TRolesPtr TRolesFetcher::GetCurrentRoles() const {
+        return CurrentRoles_.Get();
+    }
+
+    TRolesFetcher::TRequest TRolesFetcher::CreateRequest(const TKeepAliveHttpClient::THeaders& authHeader) const {
+        TRequest request{
+            .Url = "/v2/roles?self=" + CGIEscapeRet(Settings_.SelfAlias),
+            .Headers = authHeader,
+        };
+
+        NRoles::TRolesPtr roles = CurrentRoles_.Get();
+        if (roles) {
+            request.Headers.emplace(IfNoneMatch_, Join("", "\"", roles->GetMeta().Revision, "\""));
+        }
+
+        return request;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/roles_fetcher.h b/library/cpp/tvmauth/client/misc/tool/roles_fetcher.h
new file mode 100644
index 0000000000..8c60b59610
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/roles_fetcher.h
@@ -0,0 +1,49 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/misc/fetch_result.h>
+#include <library/cpp/tvmauth/client/misc/utils.h>
+#include <library/cpp/tvmauth/client/misc/roles/roles.h>
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/string.h>
+
+namespace NTvmAuth::NTvmTool {
+    struct TRolesFetcherSettings {
+        TString SelfAlias;
+        TDuration UpdatePeriod = TDuration::Minutes(1);
+        TDuration WarnPeriod = TDuration::Minutes(20);
+    };
+
+    class TRolesFetcher {
+    public:
+        TRolesFetcher(const TRolesFetcherSettings& settings, TLoggerPtr logger);
+
+        bool IsTimeToUpdate(TDuration sinceUpdate) const;
+        bool ShouldWarn(TDuration sinceUpdate) const;
+        bool AreRolesOk() const;
+
+        NUtils::TFetchResult FetchActualRoles(const TKeepAliveHttpClient::THeaders& authHeader,
+                                              TKeepAliveHttpClient& client) const;
+        void Update(NUtils::TFetchResult&& fetchResult);
+
+        NTvmAuth::NRoles::TRolesPtr GetCurrentRoles() const;
+
+    protected:
+        struct TRequest {
+            TString Url;
+            TKeepAliveHttpClient::THeaders Headers;
+        };
+
+    protected:
+        TRequest CreateRequest(const TKeepAliveHttpClient::THeaders& authHeader) const;
+
+    private:
+        const TRolesFetcherSettings Settings_;
+        const TLoggerPtr Logger_;
+        const TString IfNoneMatch_ = "If-None-Match";
+
+        NUtils::TProtectedValue<NTvmAuth::NRoles::TRolesPtr> CurrentRoles_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/settings.cpp b/library/cpp/tvmauth/client/misc/tool/settings.cpp
new file mode 100644
index 0000000000..894501f19d
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/settings.cpp
@@ -0,0 +1,37 @@
+#include "settings.h"
+
+#include <library/cpp/string_utils/url/url.h>
+
+#include <util/system/env.h>
+
+namespace NTvmAuth::NTvmTool {
+    TClientSettings::TClientSettings(const TAlias& selfAias)
+        : SelfAias_(selfAias)
+        , Hostname_("localhost")
+        , Port_(1)
+        , SocketTimeout_(TDuration::Seconds(5))
+        , ConnectTimeout_(TDuration::Seconds(30))
+    {
+        AuthToken_ = GetEnv("TVMTOOL_LOCAL_AUTHTOKEN");
+        if (!AuthToken_) {
+            AuthToken_ = GetEnv("QLOUD_TVM_TOKEN");
+        }
+        TStringBuf auth(AuthToken_);
+        FixSpaces(auth);
+        AuthToken_ = auth;
+
+        const TString url = GetEnv("DEPLOY_TVM_TOOL_URL");
+        if (url) {
+            TStringBuf scheme, host;
+            TryGetSchemeHostAndPort(url, scheme, host, Port_);
+        }
+
+        Y_ENSURE_EX(SelfAias_, TBrokenTvmClientSettings() << "Alias for your TVM client cannot be empty");
+    }
+
+    void TClientSettings::FixSpaces(TStringBuf& str) {
+        while (str && isspace(str.back())) {
+            str.Chop(1);
+        }
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/settings.h b/library/cpp/tvmauth/client/misc/tool/settings.h
new file mode 100644
index 0000000000..67c3959263
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/settings.h
@@ -0,0 +1,169 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/misc/settings.h>
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/maybe.h>
+
+namespace NTvmAuth::NTvmTool {
+    /**
+     * Uses local http-interface to get state: http://localhost/tvm/.
+     * This interface can be provided with tvmtool (local daemon) or Qloud/YP (local http api in container).
+     * See more: https://wiki.yandex-team.ru/passport/tvm2/qloud/.
+     *
+     * Most part of settings will be fetched from tvmtool on start of client.
+     * You need to use aliases for TVM-clients (src and dst) which you specified in tvmtool or Qloud/YP interface
+     */
+    class TClientSettings: public NTvmAuth::TClientSettings {
+    public:
+        /*!
+         * Sets default values:
+         * - hostname == "localhost"
+         * - port detected with env["DEPLOY_TVM_TOOL_URL"] (provided with Yandex.Deploy),
+         *      otherwise port == 1 (it is ok for Qloud)
+         * - authToken: env["TVMTOOL_LOCAL_AUTHTOKEN"] (provided with Yandex.Deploy),
+         *      otherwise env["QLOUD_TVM_TOKEN"] (provided with Qloud)
+         *
+         * AuthToken is protection from SSRF.
+         *
+         * @param selfAias - alias for your TVM client, which you specified in tvmtool or YD interface
+         */
+        TClientSettings(const TAlias& selfAias);
+
+        /*!
+         * Look at comment for ctor
+         * @param port
+         */
+        TClientSettings& SetPort(ui16 port) {
+            Port_ = port;
+            return *this;
+        }
+
+        /*!
+         * Default value: hostname == "localhost"
+         * @param hostname
+         */
+        TClientSettings& SetHostname(const TString& hostname) {
+            Y_ENSURE_EX(hostname, TBrokenTvmClientSettings() << "Hostname cannot be empty");
+            Hostname_ = hostname;
+            return *this;
+        }
+
+        TClientSettings& SetSocketTimeout(TDuration socketTimeout) {
+            SocketTimeout_ = socketTimeout;
+            return *this;
+        }
+
+        TClientSettings& SetConnectTimeout(TDuration connectTimeout) {
+            ConnectTimeout_ = connectTimeout;
+            return *this;
+        }
+
+        /*!
+         * Look at comment for ctor
+         * @param token
+         */
+        TClientSettings& SetAuthToken(TStringBuf token) {
+            FixSpaces(token);
+            Y_ENSURE_EX(token, TBrokenTvmClientSettings() << "Auth token cannot be empty");
+            AuthToken_ = token;
+            return *this;
+        }
+
+        /*!
+         * Blackbox environmet is provided by tvmtool for client.
+         * You can override it for your purpose with limitations:
+         *   (env from tvmtool) -> (override)
+         *  - Prod/ProdYateam -> Prod/ProdYateam
+         *  - Test/TestYateam -> Test/TestYateam
+         *  - Stress -> Stress
+         *
+         * You can contact tvm-dev@yandex-team.ru if limitations are too strict
+         * @param env
+         */
+        TClientSettings& OverrideBlackboxEnv(EBlackboxEnv env) {
+            BbEnv_ = env;
+            return *this;
+        }
+
+        /*!
+         * By default client checks src from ServiceTicket or default uid from UserTicket -
+         *   to prevent you from forgetting to check it yourself.
+         * It does binary checks only:
+         *   ticket gets status NoRoles, if there is no role for src or default uid.
+         * You need to check roles on your own if you have a non-binary role system or
+         *     you have disabled ShouldCheckSrc/ShouldCheckDefaultUid
+         *
+         * You may need to disable this check in the following cases:
+         *   - You use GetRoles() to provide verbose message (with revision).
+         *     Double check may be inconsistent:
+         *       binary check inside client uses revision of roles X - i.e. src 100500 has no role,
+         *       exact check in your code uses revision of roles Y -  i.e. src 100500 has some roles.
+         */
+        bool ShouldCheckSrc = true;
+        bool ShouldCheckDefaultUid = true;
+
+        // DEPRECATED API
+        // TODO: get rid of it: PASSP-35377
+    public:
+        // Deprecated: set attributes directly
+        TClientSettings& SetShouldCheckSrc(bool val = true) {
+            ShouldCheckSrc = val;
+            return *this;
+        }
+
+        // Deprecated: set attributes directly
+        TClientSettings& SetSShouldCheckDefaultUid(bool val = true) {
+            ShouldCheckDefaultUid = val;
+            return *this;
+        }
+
+    public: // for TAsyncUpdaterBase
+        const TAlias& GetSelfAlias() const {
+            return SelfAias_;
+        }
+
+        const TString& GetHostname() const {
+            return Hostname_;
+        }
+
+        ui16 GetPort() const {
+            return Port_;
+        }
+
+        TDuration GetSocketTimeout() const {
+            return SocketTimeout_;
+        }
+
+        TDuration GetConnectTimeout() const {
+            return ConnectTimeout_;
+        }
+
+        const TString& GetAuthToken() const {
+            Y_ENSURE_EX(AuthToken_, TBrokenTvmClientSettings()
+                                        << "Auth token cannot be empty. "
+                                        << "Env 'TVMTOOL_LOCAL_AUTHTOKEN' and 'QLOUD_TVM_TOKEN' are empty.");
+            return AuthToken_;
+        }
+
+        TMaybe<EBlackboxEnv> GetOverridedBlackboxEnv() const {
+            return BbEnv_;
+        }
+
+    private:
+        void FixSpaces(TStringBuf& str);
+
+    private:
+        TAlias SelfAias_;
+        TString Hostname_;
+        ui16 Port_;
+        TDuration SocketTimeout_;
+        TDuration ConnectTimeout_;
+        TString AuthToken_;
+        TMaybe<EBlackboxEnv> BbEnv_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/threaded_updater.cpp b/library/cpp/tvmauth/client/misc/tool/threaded_updater.cpp
new file mode 100644
index 0000000000..35bbe4f617
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/threaded_updater.cpp
@@ -0,0 +1,370 @@
+#include "threaded_updater.h"
+
+#include <library/cpp/tvmauth/client/misc/utils.h>
+
+#include <library/cpp/json/json_reader.h>
+
+#include <util/generic/hash_set.h>
+#include <util/stream/str.h>
+#include <util/string/ascii.h>
+#include <util/string/builder.h>
+#include <util/string/cast.h>
+
+namespace NTvmAuth::NTvmTool {
+    TAsyncUpdaterPtr TThreadedUpdater::Create(const TClientSettings& settings, TLoggerPtr logger) {
+        Y_ENSURE_EX(logger, TNonRetriableException() << "Logger is required");
+        THolder<TThreadedUpdater> p(new TThreadedUpdater(
+            settings.GetHostname(),
+            settings.GetPort(),
+            settings.GetSocketTimeout(),
+            settings.GetConnectTimeout(),
+            std::move(logger)));
+        p->Init(settings);
+        p->StartWorker();
+        return p.Release();
+    }
+
+    TThreadedUpdater::~TThreadedUpdater() {
+        StopWorker(); // Required here to avoid using of deleted members
+    }
+
+    TClientStatus TThreadedUpdater::GetStatus() const {
+        const TClientStatus::ECode state = GetState();
+        return TClientStatus(state, GetLastError(state == TClientStatus::Ok));
+    }
+
+    NRoles::TRolesPtr TThreadedUpdater::GetRoles() const {
+        Y_ENSURE_EX(RolesFetcher_,
+                    TBrokenTvmClientSettings() << "Roles were not configured in settings");
+        return RolesFetcher_->GetCurrentRoles();
+    }
+
+    TClientStatus::ECode TThreadedUpdater::GetState() const {
+        const TInstant now = TInstant::Now();
+        const TMetaInfo::TConfigPtr config = MetaInfo_.GetConfig();
+
+        if ((config->AreTicketsRequired() && AreServiceTicketsInvalid(now)) || ArePublicKeysInvalid(now)) {
+            return TClientStatus::Error;
+        }
+
+        if (config->AreTicketsRequired()) {
+            if (!GetCachedServiceTickets() || config->DstAliases.size() > GetCachedServiceTickets()->TicketsByAlias.size()) {
+                return TClientStatus::Error;
+            }
+        }
+
+        const TDuration st = now - GetUpdateTimeOfServiceTickets();
+        const TDuration pk = now - GetUpdateTimeOfPublicKeys();
+
+        if ((config->AreTicketsRequired() && st > ServiceTicketsDurations_.Expiring) || pk > PublicKeysDurations_.Expiring) {
+            return TClientStatus::Warning;
+        }
+
+        if (RolesFetcher_ && RolesFetcher_->ShouldWarn(now - GetUpdateTimeOfRoles())) {
+            return TClientStatus::Warning;
+        }
+
+        if (IsConfigWarnTime()) {
+            return TClientStatus::Warning;
+        }
+
+        return TClientStatus::Ok;
+    }
+
+    TThreadedUpdater::TThreadedUpdater(const TString& host, ui16 port, TDuration socketTimeout, TDuration connectTimeout, TLoggerPtr logger)
+        : TThreadedUpdaterBase(TDuration::Seconds(5), logger, host, port, socketTimeout, connectTimeout)
+        , MetaInfo_(logger)
+        , ConfigWarnDelay_(TDuration::Seconds(30))
+    {
+        ServiceTicketsDurations_.RefreshPeriod = TDuration::Minutes(10);
+        PublicKeysDurations_.RefreshPeriod = TDuration::Minutes(10);
+    }
+
+    void TThreadedUpdater::Init(const TClientSettings& settings) {
+        const TMetaInfo::TConfigPtr config = MetaInfo_.Init(GetClient(), settings);
+        LastVisitForConfig_ = TInstant::Now();
+
+        SetBbEnv(config->BbEnv, settings.GetOverridedBlackboxEnv());
+        if (settings.GetOverridedBlackboxEnv()) {
+            LogInfo(TStringBuilder()
+                    << "Meta: override blackbox env: " << config->BbEnv
+                    << "->" << *settings.GetOverridedBlackboxEnv());
+        }
+
+        if (config->IdmSlug) {
+            RolesFetcher_ = std::make_unique<TRolesFetcher>(
+                TRolesFetcherSettings{
+                    .SelfAlias = settings.GetSelfAlias(),
+                },
+                Logger_);
+        }
+
+        ui8 tries = 3;
+        do {
+            UpdateState();
+        } while (!IsEverythingOk(*config) && --tries > 0);
+
+        if (!IsEverythingOk(*config)) {
+            ThrowLastError();
+        }
+    }
+
+    void TThreadedUpdater::UpdateState() {
+        bool wasUpdated = false;
+        try {
+            wasUpdated = MetaInfo_.TryUpdateConfig(GetClient());
+            LastVisitForConfig_ = TInstant::Now();
+            ClearError(EScope::TvmtoolConfig);
+        } catch (const std::exception& e) {
+            ProcessError(EType::Retriable, EScope::TvmtoolConfig, e.what());
+            LogWarning(TStringBuilder() << "Error while fetching of tvmtool config: " << e.what());
+        }
+        if (IsConfigWarnTime()) {
+            LogError(TStringBuilder() << "Tvmtool config have not been refreshed for too long period");
+        }
+
+        TMetaInfo::TConfigPtr config = MetaInfo_.GetConfig();
+
+        if (wasUpdated || IsTimeToUpdateServiceTickets(*config, LastVisitForServiceTickets_)) {
+            try {
+                const TInstant updateTime = UpdateServiceTickets(*config);
+                SetUpdateTimeOfServiceTickets(updateTime);
+                LastVisitForServiceTickets_ = TInstant::Now();
+
+                if (AreServiceTicketsOk(*config)) {
+                    ClearError(EScope::ServiceTickets);
+                }
+                LogDebug(TStringBuilder() << "Tickets fetched from tvmtool: " << updateTime);
+            } catch (const std::exception& e) {
+                ProcessError(EType::Retriable, EScope::ServiceTickets, e.what());
+                LogWarning(TStringBuilder() << "Error while fetching of tickets: " << e.what());
+            }
+
+            if (TInstant::Now() - GetUpdateTimeOfServiceTickets() > ServiceTicketsDurations_.Expiring) {
+                LogError("Service tickets have not been refreshed for too long period");
+            }
+        }
+
+        if (wasUpdated || IsTimeToUpdatePublicKeys(LastVisitForPublicKeys_)) {
+            try {
+                const TInstant updateTime = UpdateKeys(*config);
+                SetUpdateTimeOfPublicKeys(updateTime);
+                LastVisitForPublicKeys_ = TInstant::Now();
+
+                if (ArePublicKeysOk()) {
+                    ClearError(EScope::PublicKeys);
+                }
+                LogDebug(TStringBuilder() << "Public keys fetched from tvmtool: " << updateTime);
+            } catch (const std::exception& e) {
+                ProcessError(EType::Retriable, EScope::PublicKeys, e.what());
+                LogWarning(TStringBuilder() << "Error while fetching of public keys: " << e.what());
+            }
+
+            if (TInstant::Now() - GetUpdateTimeOfPublicKeys() > PublicKeysDurations_.Expiring) {
+                LogError("Public keys have not been refreshed for too long period");
+            }
+        }
+
+        if (RolesFetcher_ && (wasUpdated || RolesFetcher_->IsTimeToUpdate(TInstant::Now() - GetUpdateTimeOfRoles()))) {
+            try {
+                RolesFetcher_->Update(RolesFetcher_->FetchActualRoles(MetaInfo_.GetAuthHeader(), GetClient()));
+                SetUpdateTimeOfRoles(TInstant::Now());
+
+                if (RolesFetcher_->AreRolesOk()) {
+                    ClearError(EScope::Roles);
+                }
+            } catch (const std::exception& e) {
+                ProcessError(EType::Retriable, EScope::Roles, e.what());
+                LogWarning(TStringBuilder() << "Failed to update roles: " << e.what());
+            }
+
+            if (RolesFetcher_->ShouldWarn(TInstant::Now() - GetUpdateTimeOfRoles())) {
+                LogError("Roles have not been refreshed for too long period");
+            }
+        }
+    }
+
+    TInstant TThreadedUpdater::UpdateServiceTickets(const TMetaInfo::TConfig& config) {
+        const std::pair<TString, TInstant> tickets = FetchServiceTickets(config);
+
+        if (TInstant::Now() - tickets.second >= ServiceTicketsDurations_.Invalid) {
+            throw yexception() << "Service tickets are too old: " << tickets.second;
+        }
+
+        TPairTicketsErrors p = ParseFetchTicketsResponse(tickets.first, config.DstAliases);
+        SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(std::move(p.Tickets),
+                                                              std::move(p.Errors),
+                                                              config.DstAliases));
+        return tickets.second;
+    }
+
+    std::pair<TString, TInstant> TThreadedUpdater::FetchServiceTickets(const TMetaInfo::TConfig& config) const {
+        TStringStream s;
+        THttpHeaders headers;
+
+        const TString request = TMetaInfo::GetRequestForTickets(config);
+        auto code = GetClient().DoGet(request, &s, MetaInfo_.GetAuthHeader(), &headers);
+        Y_ENSURE(code == 200, ProcessHttpError(EScope::ServiceTickets, request, code, s.Str()));
+
+        return {s.Str(), GetBirthTimeFromResponse(headers, "tickets")};
+    }
+
+    static THashSet<TTvmId> GetAllTvmIds(const TMetaInfo::TDstAliases& dsts) {
+        THashSet<TTvmId> res;
+        res.reserve(dsts.size());
+
+        for (const auto& pair : dsts) {
+            res.insert(pair.second);
+        }
+
+        return res;
+    }
+
+    TAsyncUpdaterBase::TPairTicketsErrors TThreadedUpdater::ParseFetchTicketsResponse(const TString& resp,
+                                                                                      const TMetaInfo::TDstAliases& dsts) const {
+        const THashSet<TTvmId> allTvmIds = GetAllTvmIds(dsts);
+
+        TServiceTickets::TMapIdStr tickets;
+        TServiceTickets::TMapIdStr errors;
+
+        auto procErr = [this](const TString& msg) {
+            ProcessError(EType::NonRetriable, EScope::ServiceTickets, msg);
+            LogError(msg);
+        };
+
+        NJson::TJsonValue doc;
+        Y_ENSURE(NJson::ReadJsonTree(resp, &doc), "Invalid json from tvmtool: " << resp);
+
+        for (const auto& pair : doc.GetMap()) {
+            NJson::TJsonValue tvmId;
+            unsigned long long tvmIdNum = 0;
+
+            if (!pair.second.GetValue("tvm_id", &tvmId) ||
+                !tvmId.GetUInteger(&tvmIdNum)) {
+                procErr(TStringBuilder()
+                        << "Failed to get 'tvm_id' from key, should never happend '"
+                        << pair.first << "': " << resp);
+                continue;
+            }
+
+            if (!allTvmIds.contains(tvmIdNum)) {
+                continue;
+            }
+
+            NJson::TJsonValue val;
+            if (!pair.second.GetValue("ticket", &val)) {
+                TString err;
+                if (pair.second.GetValue("error", &val)) {
+                    err = val.GetString();
+                } else {
+                    err = "Failed to get 'ticket' and 'error', should never happend: " + pair.first;
+                }
+
+                procErr(TStringBuilder()
+                        << "Failed to get ServiceTicket for " << pair.first
+                        << " (" << tvmIdNum << "): " << err);
+
+                errors.insert({tvmIdNum, std::move(err)});
+                continue;
+            }
+
+            tickets.insert({tvmIdNum, val.GetString()});
+        }
+
+        // This work-around is required because of bug in old verions of tvmtool: PASSP-24829
+        for (const auto& pair : dsts) {
+            if (!tickets.contains(pair.second) && !errors.contains(pair.second)) {
+                TString err = "Missing tvm_id in response, should never happend: " + pair.first;
+
+                procErr(TStringBuilder()
+                        << "Failed to get ServiceTicket for " << pair.first
+                        << " (" << pair.second << "): " << err);
+
+                errors.emplace(pair.second, std::move(err));
+            }
+        }
+
+        return {std::move(tickets), std::move(errors)};
+    }
+
+    TInstant TThreadedUpdater::UpdateKeys(const TMetaInfo::TConfig& config) {
+        const std::pair<TString, TInstant> keys = FetchPublicKeys();
+
+        if (TInstant::Now() - keys.second >= PublicKeysDurations_.Invalid) {
+            throw yexception() << "Public keys are too old: " << keys.second;
+        }
+
+        SetServiceContext(MakeIntrusiveConst<TServiceContext>(
+            TServiceContext::CheckingFactory(config.SelfTvmId, keys.first)));
+        SetUserContext(keys.first);
+
+        return keys.second;
+    }
+
+    std::pair<TString, TInstant> TThreadedUpdater::FetchPublicKeys() const {
+        TStringStream s;
+        THttpHeaders headers;
+
+        auto code = GetClient().DoGet("/tvm/keys", &s, MetaInfo_.GetAuthHeader(), &headers);
+        Y_ENSURE(code == 200, ProcessHttpError(EScope::PublicKeys, "/tvm/keys", code, s.Str()));
+
+        return {s.Str(), GetBirthTimeFromResponse(headers, "public keys")};
+    }
+
+    TInstant TThreadedUpdater::GetBirthTimeFromResponse(const THttpHeaders& headers, TStringBuf errMsg) {
+        auto it = std::find_if(headers.begin(),
+                               headers.end(),
+                               [](const THttpInputHeader& h) {
+                                   return AsciiEqualsIgnoreCase(h.Name(), "X-Ya-Tvmtool-Data-Birthtime");
+                               });
+        Y_ENSURE(it != headers.end(), "Failed to fetch bithtime of " << errMsg << " from tvmtool");
+
+        ui64 time = 0;
+        Y_ENSURE(TryIntFromString<10>(it->Value(), time),
+                 "Bithtime of " << errMsg << " from tvmtool must be unixtime. Got: " << it->Value());
+
+        return TInstant::Seconds(time);
+    }
+
+    bool TThreadedUpdater::IsTimeToUpdateServiceTickets(const TMetaInfo::TConfig& config,
+                                                        TInstant lastUpdate) const {
+        return config.AreTicketsRequired() &&
+               TInstant::Now() - lastUpdate > ServiceTicketsDurations_.RefreshPeriod;
+    }
+
+    bool TThreadedUpdater::IsTimeToUpdatePublicKeys(TInstant lastUpdate) const {
+        return TInstant::Now() - lastUpdate > PublicKeysDurations_.RefreshPeriod;
+    }
+
+    bool TThreadedUpdater::IsEverythingOk(const TMetaInfo::TConfig& config) const {
+        if (RolesFetcher_ && !RolesFetcher_->AreRolesOk()) {
+            return false;
+        }
+        return AreServiceTicketsOk(config) && ArePublicKeysOk();
+    }
+
+    bool TThreadedUpdater::AreServiceTicketsOk(const TMetaInfo::TConfig& config) const {
+        return AreServiceTicketsOk(config.DstAliases.size());
+    }
+
+    bool TThreadedUpdater::AreServiceTicketsOk(size_t requiredCount) const {
+        if (requiredCount == 0) {
+            return true;
+        }
+
+        auto c = GetCachedServiceTickets();
+        return c && c->TicketsByAlias.size() == requiredCount;
+    }
+
+    bool TThreadedUpdater::ArePublicKeysOk() const {
+        return GetCachedServiceContext() && GetCachedUserContext();
+    }
+
+    bool TThreadedUpdater::IsConfigWarnTime() const {
+        return LastVisitForConfig_ + ConfigWarnDelay_ < TInstant::Now();
+    }
+
+    void TThreadedUpdater::Worker() {
+        UpdateState();
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/threaded_updater.h b/library/cpp/tvmauth/client/misc/tool/threaded_updater.h
new file mode 100644
index 0000000000..57f97f5442
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/threaded_updater.h
@@ -0,0 +1,58 @@
+#pragma once
+
+#include "meta_info.h"
+#include "roles_fetcher.h"
+
+#include <library/cpp/tvmauth/client/misc/async_updater.h>
+#include <library/cpp/tvmauth/client/misc/threaded_updater.h>
+
+#include <atomic>
+
+namespace NTvmAuth::NTvmTool {
+    class TThreadedUpdater: public TThreadedUpdaterBase {
+    public:
+        static TAsyncUpdaterPtr Create(const TClientSettings& settings, TLoggerPtr logger);
+        ~TThreadedUpdater();
+
+        TClientStatus GetStatus() const override;
+        NRoles::TRolesPtr GetRoles() const override;
+
+    protected: // for tests
+        TClientStatus::ECode GetState() const;
+
+        TThreadedUpdater(const TString& host, ui16 port, TDuration socketTimeout, TDuration connectTimeout, TLoggerPtr logger);
+
+        void Init(const TClientSettings& settings);
+        void UpdateState();
+
+        TInstant UpdateServiceTickets(const TMetaInfo::TConfig& config);
+        std::pair<TString, TInstant> FetchServiceTickets(const TMetaInfo::TConfig& config) const;
+        TPairTicketsErrors ParseFetchTicketsResponse(const TString& resp,
+                                                     const TMetaInfo::TDstAliases& dsts) const;
+
+        TInstant UpdateKeys(const TMetaInfo::TConfig& config);
+        std::pair<TString, TInstant> FetchPublicKeys() const;
+
+        static TInstant GetBirthTimeFromResponse(const THttpHeaders& headers, TStringBuf errMsg);
+
+        bool IsTimeToUpdateServiceTickets(const TMetaInfo::TConfig& config, TInstant lastUpdate) const;
+        bool IsTimeToUpdatePublicKeys(TInstant lastUpdate) const;
+
+        bool IsEverythingOk(const TMetaInfo::TConfig& config) const;
+        bool AreServiceTicketsOk(const TMetaInfo::TConfig& config) const;
+        bool AreServiceTicketsOk(size_t requiredCount) const;
+        bool ArePublicKeysOk() const;
+        bool IsConfigWarnTime() const;
+
+    private:
+        void Worker() override;
+
+    protected:
+        TMetaInfo MetaInfo_;
+        TInstant LastVisitForServiceTickets_;
+        TInstant LastVisitForPublicKeys_;
+        TInstant LastVisitForConfig_;
+        TDuration ConfigWarnDelay_;
+        std::unique_ptr<TRolesFetcher> RolesFetcher_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/utils.cpp b/library/cpp/tvmauth/client/misc/utils.cpp
new file mode 100644
index 0000000000..a124c7b11c
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/utils.cpp
@@ -0,0 +1,46 @@
+#include "utils.h"
+
+#include <library/cpp/tvmauth/client/facade.h>
+
+#include <util/stream/format.h>
+
+namespace NTvmAuth::NInternal {
+    void TClientCaningKnife::StartTvmClientStopping(TTvmClient* c) {
+        if (c && c->Updater_) {
+            c->Updater_->StartTvmClientStopping();
+        }
+    }
+
+    bool TClientCaningKnife::IsTvmClientStopped(TTvmClient* c) {
+        return c && c->Updater_ ? c->Updater_->IsTvmClientStopped() : true;
+    }
+}
+
+namespace NTvmAuth::NUtils {
+    TString ToHex(const TStringBuf s) {
+        TStringStream res;
+        res.Reserve(2 * s.size());
+
+        for (char c : s) {
+            res << Hex(c, HF_FULL);
+        }
+
+        return std::move(res.Str());
+    }
+
+    bool CheckBbEnvOverriding(EBlackboxEnv original, EBlackboxEnv override) noexcept {
+        switch (original) {
+            case EBlackboxEnv::Prod:
+            case EBlackboxEnv::ProdYateam:
+                return override == EBlackboxEnv::Prod || override == EBlackboxEnv::ProdYateam;
+            case EBlackboxEnv::Test:
+                return true;
+            case EBlackboxEnv::TestYateam:
+                return override == EBlackboxEnv::Test || override == EBlackboxEnv::TestYateam;
+            case EBlackboxEnv::Stress:
+                return override == EBlackboxEnv::Stress;
+        }
+
+        return false;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/utils.h b/library/cpp/tvmauth/client/misc/utils.h
new file mode 100644
index 0000000000..1aa5e61bf1
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/utils.h
@@ -0,0 +1,95 @@
+#pragma once
+
+#include "api/settings.h"
+#include "tool/settings.h"
+
+#include <util/string/cast.h>
+#include <util/system/spinlock.h>
+
+#include <optional>
+
+namespace NTvmAuth {
+    class TTvmClient;
+}
+
+namespace NTvmAuth::NInternal {
+    class TClientCaningKnife {
+    public:
+        static void StartTvmClientStopping(TTvmClient* c);
+        static bool IsTvmClientStopped(TTvmClient* c);
+    };
+}
+
+namespace NTvmAuth::NUtils {
+    TString ToHex(const TStringBuf s);
+
+    inline NTvmAuth::NTvmApi::TClientSettings::TDstMap ParseDstMap(TStringBuf dsts) {
+        NTvmAuth::NTvmApi::TClientSettings::TDstMap res;
+
+        while (dsts) {
+            TStringBuf pair = dsts.NextTok(';');
+            TStringBuf alias = pair.NextTok(':');
+            res.insert(decltype(res)::value_type(
+                alias,
+                IntFromString<TTvmId, 10>(pair)));
+        }
+
+        return res;
+    }
+
+    inline NTvmAuth::NTvmApi::TClientSettings::TDstVector ParseDstVector(TStringBuf dsts) {
+        NTvmAuth::NTvmApi::TClientSettings::TDstVector res;
+
+        while (dsts) {
+            res.push_back(IntFromString<TTvmId, 10>(dsts.NextTok(';')));
+        }
+
+        return res;
+    }
+
+    bool CheckBbEnvOverriding(EBlackboxEnv original, EBlackboxEnv override) noexcept;
+
+    template <class T>
+    class TProtectedValue {
+        class TAssignOp {
+        public:
+            static void Assign(T& l, const T& r) {
+                l = r;
+            }
+
+            template <typename U>
+            static void Assign(std::shared_ptr<U>& l, std::shared_ptr<U>& r) {
+                l.swap(r);
+            }
+
+            template <typename U>
+            static void Assign(TIntrusiveConstPtr<U>& l, TIntrusiveConstPtr<U>& r) {
+                l.Swap(r);
+            }
+        };
+
+    public:
+        TProtectedValue() = default;
+
+        TProtectedValue(T value)
+            : Value_(value)
+        {
+        }
+
+        T Get() const {
+            with_lock (Lock_) {
+                return Value_;
+            }
+        }
+
+        void Set(T o) {
+            with_lock (Lock_) {
+                TAssignOp::Assign(Value_, o);
+            }
+        }
+
+    private:
+        T Value_;
+        mutable TAdaptiveLock Lock_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/mocked_updater.cpp b/library/cpp/tvmauth/client/mocked_updater.cpp
new file mode 100644
index 0000000000..54f94bc92a
--- /dev/null
+++ b/library/cpp/tvmauth/client/mocked_updater.cpp
@@ -0,0 +1,60 @@
+#include "mocked_updater.h"
+
+#include <library/cpp/tvmauth/unittest.h>
+
+namespace NTvmAuth {
+    TMockedUpdater::TSettings TMockedUpdater::TSettings::CreateDeafult() {
+        TMockedUpdater::TSettings res;
+
+        res.SelfTvmId = 100500;
+
+        res.Backends = {
+            {
+                /*.Alias_ = */ "my_dest",
+                /*.Id_ = */ 42,
+                /*.Value_ = */ "3:serv:CBAQ__________9_IgYIlJEGECo:O9-vbod_8czkKrpwJAZCI8UgOIhNr2xKPcS-LWALrVC224jga2nIT6vLiw6q3d6pAT60g9K7NB39LEmh7vMuePtUMjzuZuL-uJg17BsH2iTLCZSxDjWxbU9piA2T6u607jiSyiy-FI74pEPqkz7KKJ28aPsefuC1VUweGkYFzNY",
+            },
+        };
+
+        res.BadBackends = {
+            {
+                /*.Alias_ = */ "my_bad_dest",
+                /*.Id_ = */ 43,
+                /*.Value_ = */ "Dst is not found",
+            },
+        };
+
+        return res;
+    }
+
+    TMockedUpdater::TMockedUpdater(const TSettings& settings)
+        : Roles_(settings.Roles)
+    {
+        SetServiceContext(MakeIntrusiveConst<TServiceContext>(TServiceContext::CheckingFactory(
+            settings.SelfTvmId,
+            NUnittest::TVMKNIFE_PUBLIC_KEYS)));
+
+        SetBbEnv(settings.UserTicketEnv);
+        SetUserContext(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+
+        TServiceTickets::TMapIdStr tickets, errors;
+        TServiceTickets::TMapAliasId aliases;
+
+        for (const TSettings::TTuple& t : settings.Backends) {
+            tickets[t.Id] = t.Value;
+            aliases[t.Alias] = t.Id;
+        }
+        for (const TSettings::TTuple& t : settings.BadBackends) {
+            errors[t.Id] = t.Value;
+            aliases[t.Alias] = t.Id;
+        }
+
+        SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            std::move(tickets),
+            std::move(errors),
+            std::move(aliases)));
+
+        SetUpdateTimeOfPublicKeys(TInstant::Now());
+        SetUpdateTimeOfServiceTickets(TInstant::Now());
+    }
+}
diff --git a/library/cpp/tvmauth/client/mocked_updater.h b/library/cpp/tvmauth/client/mocked_updater.h
new file mode 100644
index 0000000000..c9a5daf3cb
--- /dev/null
+++ b/library/cpp/tvmauth/client/mocked_updater.h
@@ -0,0 +1,44 @@
+#pragma once
+
+#include "misc/async_updater.h"
+
+namespace NTvmAuth {
+    class TMockedUpdater: public TAsyncUpdaterBase {
+    public:
+        struct TSettings {
+            struct TTuple {
+                TClientSettings::TAlias Alias;
+                TTvmId Id = 0;
+                TString Value; // ticket or error
+            };
+
+            TTvmId SelfTvmId = 0;
+            TVector<TTuple> Backends;
+            TVector<TTuple> BadBackends;
+            EBlackboxEnv UserTicketEnv = EBlackboxEnv::Test;
+            NRoles::TRolesPtr Roles;
+
+            static TSettings CreateDeafult();
+        };
+
+        TMockedUpdater(const TSettings& settings = TSettings::CreateDeafult());
+
+        TClientStatus GetStatus() const override {
+            return TClientStatus();
+        }
+
+        NRoles::TRolesPtr GetRoles() const override {
+            Y_ENSURE_EX(Roles_, TIllegalUsage() << "Roles are not provided");
+            return Roles_;
+        }
+
+        using TAsyncUpdaterBase::SetServiceContext;
+        using TAsyncUpdaterBase::SetServiceTickets;
+        using TAsyncUpdaterBase::SetUpdateTimeOfPublicKeys;
+        using TAsyncUpdaterBase::SetUpdateTimeOfServiceTickets;
+        using TAsyncUpdaterBase::SetUserContext;
+
+    protected:
+        NRoles::TRolesPtr Roles_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/ut/async_updater_ut.cpp b/library/cpp/tvmauth/client/ut/async_updater_ut.cpp
new file mode 100644
index 0000000000..1c1e8cbaae
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/async_updater_ut.cpp
@@ -0,0 +1,165 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/misc/async_updater.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(AsyncUpdater) {
+    static const TString SRV_TICKET = "3:serv:CBAQ__________9_IgYIexCUkQY:GioCM49Ob6_f80y6FY0XBVN4hLXuMlFeyMvIMiDuQnZkbkLpRpQOuQo5YjWoBjM0Vf-XqOm8B7xtrvxSYHDD7Q4OatN2l-Iwg7i71lE3scUeD36x47st3nd0OThvtjrFx_D8mw_c0GT5KcniZlqq1SjhLyAk1b_zJsx8viRAhCU";
+    static const TString PROD_TICKET = "3:user:CAsQ__________9_Gg4KAgh7EHsg0oXYzAQoAA:N8PvrDNLh-5JywinxJntLeQGDEHBUxfzjuvB8-_BEUv1x9CALU7do8irDlDYVeVVDr4AIpR087YPZVzWPAqmnBuRJS0tJXekmDDvrivLnbRrzY4IUXZ_fImB0fJhTyVetKv6RD11bGqnAJeDpIukBwPTbJc_EMvKDt8V490CJFw";
+    static const TString TEST_TICKET = "3:user:CA0Q__________9_Gg4KAgh7EHsg0oXYzAQoAQ:FSADps3wNGm92Vyb1E9IVq5M6ZygdGdt1vafWWEhfDDeCLoVA-sJesxMl2pGW4OxJ8J1r_MfpG3ZoBk8rLVMHUFrPa6HheTbeXFAWl8quEniauXvKQe4VyrpA1SPgtRoFqi5upSDIJzEAe1YRJjq1EClQ_slMt8R0kA_JjKUX54";
+    static const TString PROD_YATEAM_TICKET = "3:user:CAwQ__________9_Gg4KAgh7EHsg0oXYzAQoAg:M9dEFEWHLHXiL7brCsyfYlm254PE6VeshUjI62u2qMDRzt6-0jAoJTIdDiogerItht1YFYSn8fSqmMf23_rueGj-wkmvyNzbcBSk3jtK2U5sai_W0bK6OwukR9tzWzi1Gcgg9DrNEeIKFvs1EBqYCF4mPHWo5bgk0CR580Cgit4";
+    static const TString TEST_YATEAM_TICKET = "3:user:CA4Q__________9_Gg4KAgh7EHsg0oXYzAQoAw:IlaV3htk3jYrviIOz3k3Dfwz7p-bYYpbrgdn53GiUrMGdrT9eobHeuzNvPLrWB0yuYZAD46C3MGxok4GGmHhT73mki4XOCX8yWT4jW_hzcHBik1442tjWwh8IWqV_7q5j5496suVuLWjnZORWbb7I-2iwdIlU1BUiDfhoAolCq8";
+    static const TString STRESS_TICKET = "3:user:CA8Q__________9_Gg4KAgh7EHsg0oXYzAQoBA:GBuG_TLo6SL2OYFxp7Zly04HPNzmAF7Fu2E8E9SnwQDoxq9rf7VThSPtTmnBSAl5UVRRPkMsRtzzHZ87qtj6l-PvF0K7PrDu7-yS_xiFTgAl9sEfXAIHJVzZLoksGRgpoBtpBUg9vVaJsPns0kWFKJgq8M-Mk9agrSk7sb2VUeQ";
+
+    class TTestUpdater: public TAsyncUpdaterBase {
+    public:
+        using TAsyncUpdaterBase::SetBbEnv;
+        using TAsyncUpdaterBase::SetUserContext;
+
+        TClientStatus GetStatus() const override {
+            return TClientStatus();
+        }
+    };
+
+    Y_UNIT_TEST(User) {
+        TTestUpdater u;
+
+        UNIT_ASSERT(!u.GetCachedUserContext());
+
+        u.SetUserContext(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT(!u.GetCachedUserContext());
+
+        UNIT_ASSERT_NO_EXCEPTION(u.SetBbEnv(EBlackboxEnv::Prod));
+        UNIT_ASSERT(u.GetCachedUserContext());
+        UNIT_ASSERT(u.GetCachedUserContext()->Check(PROD_TICKET));
+        UNIT_ASSERT_NO_EXCEPTION(u.GetCachedUserContext(EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(u.GetCachedUserContext(EBlackboxEnv::ProdYateam)->Check(PROD_YATEAM_TICKET));
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(u.SetBbEnv(EBlackboxEnv::Prod, EBlackboxEnv::Test),
+                                       TBrokenTvmClientSettings,
+                                       "Overriding of BlackboxEnv is illegal: Prod -> Test");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(u.GetCachedUserContext(EBlackboxEnv::Test),
+                                       TBrokenTvmClientSettings,
+                                       "Overriding of BlackboxEnv is illegal: Prod -> Test");
+
+        UNIT_ASSERT(u.GetCachedUserContext());
+        UNIT_ASSERT(u.GetCachedUserContext()->Check(PROD_TICKET));
+    }
+
+    class DummyUpdater: public TAsyncUpdaterBase {
+    public:
+        TClientStatus GetStatus() const override {
+            return TClientStatus();
+        }
+
+        using TAsyncUpdaterBase::SetServiceContext;
+        using TAsyncUpdaterBase::SetServiceTickets;
+        using TAsyncUpdaterBase::SetUserContext;
+    };
+
+    Y_UNIT_TEST(Cache) {
+        DummyUpdater d;
+
+        UNIT_ASSERT(!d.GetCachedServiceTickets());
+        TServiceTicketsPtr st = MakeIntrusiveConst<TServiceTickets>(TServiceTickets::TMapIdStr(),
+                                                                    TServiceTickets::TMapIdStr(),
+                                                                    TServiceTickets::TMapAliasId());
+        d.SetServiceTickets(st);
+        UNIT_ASSERT_EQUAL(st.Get(), d.GetCachedServiceTickets().Get());
+
+        UNIT_ASSERT(!d.GetCachedServiceContext());
+        TServiceContextPtr sc = MakeIntrusiveConst<TServiceContext>(TServiceContext::SigningFactory("kjndfadfndsfafdasd"));
+        d.SetServiceContext(sc);
+        UNIT_ASSERT_EQUAL(sc.Get(), d.GetCachedServiceContext().Get());
+
+        UNIT_ASSERT(!d.GetCachedUserContext());
+        d.SetUserContext(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+    }
+
+    Y_UNIT_TEST(ServiceTickets_Aliases) {
+        using TId = TServiceTickets::TMapIdStr;
+        using TUnfetchedId = TServiceTickets::TIdSet;
+        using TStr = TServiceTickets::TMapAliasStr;
+        using TUnfetchedAlias = TServiceTickets::TAliasSet;
+        using TAls = TServiceTickets::TMapAliasId;
+        TServiceTickets t(TId{}, TId{}, TAls{});
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({{1, "t1"}, {2, "t2"}}),
+                                                     TId({{3, "e1"}}),
+                                                     TAls()));
+        UNIT_ASSERT_EQUAL(TId({{1, "t1"}, {2, "t2"}}), t.TicketsById);
+        UNIT_ASSERT_EQUAL(TId({{3, "e1"}}), t.ErrorsById);
+        UNIT_ASSERT_EQUAL(TStr(), t.TicketsByAlias);
+        UNIT_ASSERT_EQUAL(TStr(), t.ErrorsByAlias);
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({{1, "t1"}, {2, "t2"}}),
+                                                     TId({{3, "e1"}}),
+                                                     TAls({{"1", 1}, {"2", 2}, {"3", 3}})));
+        UNIT_ASSERT_EQUAL(TId({{1, "t1"}, {2, "t2"}}), t.TicketsById);
+        UNIT_ASSERT_EQUAL(TId({{3, "e1"}}), t.ErrorsById);
+        UNIT_ASSERT_EQUAL(TUnfetchedId(), t.UnfetchedIds);
+        UNIT_ASSERT_EQUAL(TStr({{"1", "t1"}, {"2", "t2"}}), t.TicketsByAlias);
+        UNIT_ASSERT_EQUAL(TStr({{"3", "e1"}}), t.ErrorsByAlias);
+        UNIT_ASSERT_EQUAL(TUnfetchedAlias({}), t.UnfetchedAliases);
+    }
+
+    Y_UNIT_TEST(ServiceTickets_UnfetchedIds) {
+        using TId = TServiceTickets::TMapIdStr;
+        using TUnfetchedId = TServiceTickets::TIdSet;
+        using TStr = TServiceTickets::TMapAliasStr;
+        using TUnfetchedAlias = TServiceTickets::TAliasSet;
+        using TAls = TServiceTickets::TMapAliasId;
+        TServiceTickets t(TId({{1, "t1"}, {2, "t2"}}),
+                          TId(),
+                          TAls({{"1", 1}, {"2", 2}, {"3", 3}}));
+
+        UNIT_ASSERT_EQUAL(TId({{1, "t1"}, {2, "t2"}}), t.TicketsById);
+        UNIT_ASSERT_EQUAL(TId({}), t.ErrorsById);
+        UNIT_ASSERT_EQUAL(TUnfetchedId({3}), t.UnfetchedIds);
+        UNIT_ASSERT_EQUAL(TUnfetchedAlias({{"3"}}), t.UnfetchedAliases);
+        UNIT_ASSERT_EQUAL(TStr({{"1", "t1"}, {"2", "t2"}}), t.TicketsByAlias);
+        UNIT_ASSERT_EQUAL(TStr(), t.ErrorsByAlias);
+    }
+
+    Y_UNIT_TEST(ServiceTickets_InvalidationTime) {
+        using TId = TServiceTickets::TMapIdStr;
+        using TAls = TServiceTickets::TMapAliasId;
+
+        TServiceTickets t(TId{}, TId{}, TAls{});
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), t.InvalidationTime);
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({{1, SRV_TICKET}}),
+                                                     TId(),
+                                                     TAls()));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(std::numeric_limits<time_t>::max()), t.InvalidationTime);
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({
+                                                         {1, SRV_TICKET},
+                                                         {2, "serv"},
+                                                     }),
+                                                     TId(),
+                                                     TAls()));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(std::numeric_limits<time_t>::max()), t.InvalidationTime);
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({
+                                                         {2, "serv"},
+                                                     }),
+                                                     TId(),
+                                                     TAls()));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), t.InvalidationTime);
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({
+                                                         {1, SRV_TICKET},
+                                                         {2, "serv"},
+                                                         {3, "3:serv:CBAQeyIECAMQAw:TiZjG2Ut9j-9n0zcqxGW8xiYmnFa-i10-dbA0FKIInKzeDuueovWVEBcgbQHndblzRCxoIBMgbotOf7ALk2xoSBnRbOKomAIEtiTBL77GByL5O8K_HUGNYb-ygqnmZlIuLalgeRQAdsKstgUwQzufnOQyekipmamwo7EVQhr8Ug"},
+                                                     }),
+                                                     TId(),
+                                                     TAls()));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(123), t.InvalidationTime);
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/checker_ut.cpp b/library/cpp/tvmauth/client/ut/checker_ut.cpp
new file mode 100644
index 0000000000..73f2b0dfda
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/checker_ut.cpp
@@ -0,0 +1,189 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/mocked_updater.h>
+#include <library/cpp/tvmauth/client/misc/checker.h>
+#include <library/cpp/tvmauth/client/misc/getter.h>
+#include <library/cpp/tvmauth/client/misc/api/threaded_updater.h>
+
+#include <library/cpp/tvmauth/type.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientChecker) {
+    static const TTvmId OK_CLIENT = 100500;
+    static const TString PROD_TICKET = "3:user:CAsQ__________9_Gg4KAgh7EHsg0oXYzAQoAA:N8PvrDNLh-5JywinxJntLeQGDEHBUxfzjuvB8-_BEUv1x9CALU7do8irDlDYVeVVDr4AIpR087YPZVzWPAqmnBuRJS0tJXekmDDvrivLnbRrzY4IUXZ_fImB0fJhTyVetKv6RD11bGqnAJeDpIukBwPTbJc_EMvKDt8V490CJFw";
+    static const TString TEST_TICKET = "3:user:CA0Q__________9_Gg4KAgh7EHsg0oXYzAQoAQ:FSADps3wNGm92Vyb1E9IVq5M6ZygdGdt1vafWWEhfDDeCLoVA-sJesxMl2pGW4OxJ8J1r_MfpG3ZoBk8rLVMHUFrPa6HheTbeXFAWl8quEniauXvKQe4VyrpA1SPgtRoFqi5upSDIJzEAe1YRJjq1EClQ_slMt8R0kA_JjKUX54";
+    static const TString PROD_YATEAM_TICKET = "3:user:CAwQ__________9_Gg4KAgh7EHsg0oXYzAQoAg:M9dEFEWHLHXiL7brCsyfYlm254PE6VeshUjI62u2qMDRzt6-0jAoJTIdDiogerItht1YFYSn8fSqmMf23_rueGj-wkmvyNzbcBSk3jtK2U5sai_W0bK6OwukR9tzWzi1Gcgg9DrNEeIKFvs1EBqYCF4mPHWo5bgk0CR580Cgit4";
+    static const TString TEST_YATEAM_TICKET = "3:user:CA4Q__________9_Gg4KAgh7EHsg0oXYzAQoAw:IlaV3htk3jYrviIOz3k3Dfwz7p-bYYpbrgdn53GiUrMGdrT9eobHeuzNvPLrWB0yuYZAD46C3MGxok4GGmHhT73mki4XOCX8yWT4jW_hzcHBik1442tjWwh8IWqV_7q5j5496suVuLWjnZORWbb7I-2iwdIlU1BUiDfhoAolCq8";
+    static const TString STRESS_TICKET = "3:user:CA8Q__________9_Gg4KAgh7EHsg0oXYzAQoBA:GBuG_TLo6SL2OYFxp7Zly04HPNzmAF7Fu2E8E9SnwQDoxq9rf7VThSPtTmnBSAl5UVRRPkMsRtzzHZ87qtj6l-PvF0K7PrDu7-yS_xiFTgAl9sEfXAIHJVzZLoksGRgpoBtpBUg9vVaJsPns0kWFKJgq8M-Mk9agrSk7sb2VUeQ";
+    static const TString SRV_TICKET = "3:serv:CBAQ__________9_IgYIexCUkQY:GioCM49Ob6_f80y6FY0XBVN4hLXuMlFeyMvIMiDuQnZkbkLpRpQOuQo5YjWoBjM0Vf-XqOm8B7xtrvxSYHDD7Q4OatN2l-Iwg7i71lE3scUeD36x47st3nd0OThvtjrFx_D8mw_c0GT5KcniZlqq1SjhLyAk1b_zJsx8viRAhCU";
+
+    Y_UNIT_TEST(User) {
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = GetCachePath(),
+            .SelfTvmId = OK_CLIENT,
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            UNIT_ASSERT_EXCEPTION(TUserTicketChecker::Check("kek", u->GetCachedUserContext()), TBrokenTvmClientSettings);
+        }
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully fetched") == TString::npos, l->Stream.Str());
+
+        s.CheckUserTicketsWithBbEnv = EBlackboxEnv::Prod;
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            auto c = u->GetCachedUserContext({});
+            UNIT_ASSERT(TUserTicketChecker::Check(PROD_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(TEST_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(PROD_YATEAM_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(TEST_YATEAM_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(STRESS_TICKET, c));
+
+            c = u->GetCachedUserContext(EBlackboxEnv::ProdYateam);
+            UNIT_ASSERT(!TUserTicketChecker::Check(PROD_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(TEST_TICKET, c));
+            UNIT_ASSERT(TUserTicketChecker::Check(PROD_YATEAM_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(TEST_YATEAM_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(STRESS_TICKET, c));
+
+            UNIT_ASSERT_EXCEPTION(TUserTicketChecker::Check(PROD_TICKET, u->GetCachedUserContext(EBlackboxEnv::Stress)), TBrokenTvmClientSettings);
+        }
+
+        s.CheckUserTicketsWithBbEnv = EBlackboxEnv::Test;
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            auto c = u->GetCachedUserContext();
+
+            UNIT_ASSERT(!TUserTicketChecker::Check(PROD_TICKET, c));
+            UNIT_ASSERT(TUserTicketChecker::Check(TEST_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(PROD_YATEAM_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(TEST_YATEAM_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(STRESS_TICKET, c));
+        }
+
+        s.CheckUserTicketsWithBbEnv = EBlackboxEnv::ProdYateam;
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            auto c = u->GetCachedUserContext();
+
+            UNIT_ASSERT(!TUserTicketChecker::Check(PROD_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(TEST_TICKET, c));
+            UNIT_ASSERT(TUserTicketChecker::Check(PROD_YATEAM_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(TEST_YATEAM_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(STRESS_TICKET, c));
+        }
+
+        s.CheckUserTicketsWithBbEnv = EBlackboxEnv::TestYateam;
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            auto c = u->GetCachedUserContext();
+
+            UNIT_ASSERT(!TUserTicketChecker::Check(PROD_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(TEST_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(PROD_YATEAM_TICKET, c));
+            UNIT_ASSERT(TUserTicketChecker::Check(TEST_YATEAM_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(STRESS_TICKET, c));
+        }
+
+        s.CheckUserTicketsWithBbEnv = EBlackboxEnv::Stress;
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            auto c = u->GetCachedUserContext();
+
+            UNIT_ASSERT(TUserTicketChecker::Check(PROD_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(TEST_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(PROD_YATEAM_TICKET, c));
+            UNIT_ASSERT(!TUserTicketChecker::Check(TEST_YATEAM_TICKET, c));
+            UNIT_ASSERT(TUserTicketChecker::Check(STRESS_TICKET, c));
+        }
+    }
+
+    Y_UNIT_TEST(Service) {
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = GetCachePath(),
+            .SelfTvmId = OK_CLIENT,
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Stress,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            UNIT_ASSERT_EXCEPTION(TServiceTicketChecker::Check(SRV_TICKET, u->GetCachedServiceContext()), TBrokenTvmClientSettings);
+        }
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully fetched") == TString::npos, l->Stream.Str());
+
+        s.CheckServiceTickets = true;
+        l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            auto c = u->GetCachedServiceContext();
+
+            UNIT_ASSERT(TServiceTicketChecker::Check(SRV_TICKET, c));
+            UNIT_ASSERT(!TServiceTicketChecker::Check(PROD_TICKET, c));
+        }
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully fetched") == TString::npos, l->Stream.Str());
+
+        s.SelfTvmId = 17;
+        l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+
+            auto c = u->GetCachedServiceContext();
+
+            UNIT_ASSERT(!TServiceTicketChecker::Check(SRV_TICKET, c));
+            UNIT_ASSERT(!TServiceTicketChecker::Check(PROD_TICKET, c));
+        }
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully fetched") == TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(Tickets) {
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = GetCachePath(),
+            .SelfTvmId = OK_CLIENT,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            auto c = u->GetCachedServiceTickets();
+            UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIKhCUkQY:CX", TServiceTicketGetter::GetTicket("blackbox", c));
+            UNIT_ASSERT_EXCEPTION_CONTAINS(TServiceTicketGetter::GetTicket("blackbox2", c),
+                                           TBrokenTvmClientSettings,
+                                           "Destination 'blackbox2' was not specified in settings. Check your settings (if you use Qloud/YP/tvmtool - check it's settings)");
+        }
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully fetched") == TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(ErrorForDst) {
+        TAsyncUpdaterPtr u = new TMockedUpdater();
+        auto c = u->GetCachedServiceTickets();
+
+        UNIT_ASSERT_VALUES_EQUAL(TMockedUpdater::TSettings::CreateDeafult().Backends.at(0).Value,
+                                 TServiceTicketGetter::GetTicket("my_dest", c));
+        UNIT_ASSERT_VALUES_EQUAL(TMockedUpdater::TSettings::CreateDeafult().Backends.at(0).Value,
+                                 TServiceTicketGetter::GetTicket(42, c));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TServiceTicketGetter::GetTicket("my_bad_dest", c),
+                                       TMissingServiceTicket,
+                                       "Failed to get ticket for 'my_bad_dest': Dst is not found");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TServiceTicketGetter::GetTicket(43, c),
+                                       TMissingServiceTicket,
+                                       "Failed to get ticket for '43': Dst is not found");
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/client_status_ut.cpp b/library/cpp/tvmauth/client/ut/client_status_ut.cpp
new file mode 100644
index 0000000000..a1c3ae74ce
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/client_status_ut.cpp
@@ -0,0 +1,18 @@
+#include <library/cpp/tvmauth/client/client_status.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientStatus) {
+    Y_UNIT_TEST(Common) {
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, TClientStatus().GetCode());
+        UNIT_ASSERT_VALUES_EQUAL("", TClientStatus().GetLastError());
+
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, TClientStatus(TClientStatus::Warning, "kek"));
+        UNIT_ASSERT_VALUES_EQUAL("kek",
+                                 TClientStatus(TClientStatus::Warning, "kek").GetLastError());
+        UNIT_ASSERT_VALUES_EQUAL("2;TvmClient: kek\n",
+                                 TClientStatus(TClientStatus::Error, "kek").CreateJugglerMessage());
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/common.h b/library/cpp/tvmauth/client/ut/common.h
new file mode 100644
index 0000000000..0aee09aefc
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/common.h
@@ -0,0 +1,240 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/logger.h>
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+#include <library/cpp/tvmauth/client/misc/roles/entities_index.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/cgiparam/cgiparam.h>
+#include <library/cpp/testing/mock_server/server.h>
+#include <library/cpp/testing/unittest/env.h>
+#include <library/cpp/testing/unittest/tests_data.h>
+
+#include <util/stream/str.h>
+#include <util/system/fs.h>
+
+class TLogger: public NTvmAuth::ILogger {
+public:
+    void Log(int lvl, const TString& msg) override {
+        Cout << TInstant::Now() << " lvl=" << lvl << " msg: " << msg << "\n";
+        Stream << lvl << ": " << msg << Endl;
+    }
+
+    TStringStream Stream;
+};
+
+static inline TString GetFilePath(const char* name) {
+    return ArcadiaSourceRoot() + "/library/cpp/tvmauth/client/ut/files/" + name;
+}
+
+static inline TString GetCachePath(const TString& dir = {}) {
+    if (dir) {
+        Y_ENSURE(NFs::MakeDirectoryRecursive("./" + dir));
+    }
+
+    auto wr = [](const TString& p, const TStringBuf body) {
+        NTvmAuth::TDiskWriter w(p);
+        Y_ENSURE(w.Write(body, TInstant::ParseIso8601("2050-01-01T00:00:00.000000Z")));
+    };
+    wr("./" + dir + "/public_keys", NTvmAuth::NUnittest::TVMKNIFE_PUBLIC_KEYS);
+    wr("./" + dir + "/service_tickets",
+       R"({
+   "19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+   "213" : { "ticket" : "service_ticket_2"},
+   "234" : { "error" : "Dst is not found" },
+   "185" : { "ticket" : "service_ticket_3"}
+}	100500)");
+
+    return "./" + dir;
+}
+
+static const TString AUTH_TOKEN = "strong_token";
+static const TString META = R"(
+{
+"bb_env" : "ProdYaTeam",
+"tenants" : [
+    {
+        "self": {
+            "alias" : "me",
+            "client_id": 100500
+        },
+        "dsts" : [
+            {
+                "alias" : "bbox",
+                "client_id": 242
+            },
+            {
+                "alias" : "pass_likers",
+                "client_id": 11
+            }
+        ]
+    },
+    {
+        "self": {
+            "alias" : "tenant_with_roles",
+            "client_id": 100500
+        },
+        "idm_slug": "some_slug",
+        "dsts" : []
+    },
+    {
+        "self": {
+            "alias" : "push-client",
+            "client_id": 100501
+        },
+        "dsts" : [
+            {
+                "alias" : "pass_likers",
+                "client_id": 100502
+            }
+        ]
+    },
+    {
+        "self": {
+            "alias" : "multi_names_for_dst",
+            "client_id": 100599
+        },
+        "dsts" : [
+            {
+                "alias" : "pass_likers",
+                "client_id": 100502
+            },
+            {
+                "alias" : "pass_haters",
+                "client_id": 100502
+            }
+        ]
+    },
+    {
+        "self": {
+            "alias" : "something_else",
+            "client_id": 100503
+        },
+        "dsts" : [
+        ]
+    }
+]
+})";
+
+static const TString TICKETS_ME =
+    R"({
+        "pass_likers": {
+            "ticket": "3:serv:CBAQ__________9_IgYIlJEGEAs:T-apeMNWFc_vHPQ3iLaZv9NjG-hf5-i23O4AhRu1M68ryN3FU5qvyqTSSiPbtJdFP6EE41QQBzEs59dHn9DRkqQNwwKf1is00Oewwj2XKO0uHukuzd9XxZnro7MfjPswsjWufxX28rmJtlfSXwAtyKt8TI5yKJnMeBPQ0m5R3k8",
+            "tvm_id": 11
+        },
+        "bbox": {
+            "ticket": "3:serv:CBAQ__________9_IgcIlJEGEPIB:N7luw0_rVmBosTTI130jwDbQd0-cMmqJeEl0ma4ZlIo_mHXjBzpOuMQ3A9YagbmOBOt8TZ_gzGvVSegWZkEeB24gM22acw0w-RcHaQKrzSOA5Zq8WLNIC8QUa4_WGTlAsb7R7eC4KTAGgouIquNAgMBdTuGOuZHnMLvZyLnOMKc",
+            "tvm_id": 242
+        }
+    })";
+
+static const TString SERVICE_TICKET_PC = "3:serv:CBAQ__________9_IggIlpEGEJaRBg:BAxaQJCdK4eFuJ6i_egqPwvJgWtlh0enDQRPr84Nx2phZ_8QtxKAUCwEa7KOU_jVvIBQIC5-ETTl2vjBt7UyygF8frdK4ab6zJoWj4n07np6vbmWd385l8KvzztLt4QkBrPiE7U46dK3pL0U8tfBkSXE8rvUIsl3RvvgSNH2J3c";
+static const TString TICKETS_PC =
+    R"({
+        "pass_likers": {
+            "ticket": "3:serv:CBAQ__________9_IggIlpEGEJaRBg:BAxaQJCdK4eFuJ6i_egqPwvJgWtlh0enDQRPr84Nx2phZ_8QtxKAUCwEa7KOU_jVvIBQIC5-ETTl2vjBt7UyygF8frdK4ab6zJoWj4n07np6vbmWd385l8KvzztLt4QkBrPiE7U46dK3pL0U8tfBkSXE8rvUIsl3RvvgSNH2J3c",
+            "tvm_id": 100502
+        }
+    })";
+
+static const TString TICKETS_MANY_DSTS =
+    R"({
+        "pass_likers": {
+            "ticket": "3:serv:CBAQ__________9_IggI95EGEJaRBg:D0MOLDhKQyI-OhC0ON9gYukz2hOctUipu1yXsvkw6NRuLhcBfvGayyUqF4ILrqepjz9GtPWIR_wO6oLSW35Z0YaFn60QWp5tG6IcAnr80lm_OnLHJt4kmEoLtGg1V0aWBT0YyouzGB2-QFNOVO86G7sYzU8FC6-V3Iyc4X7XTNc",
+            "tvm_id": 100502
+        },
+        "who_are_you??": {
+            "ticket": "kek",
+            "tvm_id": 100503
+        },
+        "pass_haters": {
+            "ticket": "3:serv:CBAQ__________9_IggI95EGEJaRBg:D0MOLDhKQyI-OhC0ON9gYukz2hOctUipu1yXsvkw6NRuLhcBfvGayyUqF4ILrqepjz9GtPWIR_wO6oLSW35Z0YaFn60QWp5tG6IcAnr80lm_OnLHJt4kmEoLtGg1V0aWBT0YyouzGB2-QFNOVO86G7sYzU8FC6-V3Iyc4X7XTNc",
+            "tvm_id": 100502
+        }
+    })";
+
+static const TString TICKETS_SE = R"({})";
+
+static const TInstant BIRTHTIME = TInstant::Seconds(14380887840);
+class TTvmTool: public TRequestReplier {
+public:
+    TString Meta;
+    HttpCodes Code;
+    TInstant Birthtime;
+
+    TTvmTool()
+        : Meta(META)
+        , Code(HTTP_OK)
+        , Birthtime(BIRTHTIME)
+    {
+    }
+
+    bool DoReply(const TReplyParams& params) override {
+        const TParsedHttpFull http(params.Input.FirstLine());
+        if (http.Path == "/tvm/ping") {
+            THttpResponse resp(HTTP_OK);
+            resp.SetContent("OK");
+            resp.OutTo(params.Output);
+            return true;
+        }
+
+        auto it = std::find_if(params.Input.Headers().begin(),
+                               params.Input.Headers().end(),
+                               [](const THttpInputHeader& h) { return h.Name() == "Authorization"; });
+        if (it == params.Input.Headers().end() || it->Value() != AUTH_TOKEN) {
+            THttpResponse resp(HTTP_UNAUTHORIZED);
+            resp.SetContent("pong");
+            resp.OutTo(params.Output);
+            return true;
+        }
+
+        THttpResponse resp(Code);
+        if (http.Path == "/tvm/keys") {
+            resp.SetContent(NTvmAuth::NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        } else if (http.Path == "/tvm/tickets") {
+            TCgiParameters cg;
+            cg.ScanAddAll(http.Cgi);
+            if (cg.Get("src") == "100500") {
+                resp.SetContent(TICKETS_ME);
+            } else if (cg.Get("src") == "100501") {
+                resp.SetContent(TICKETS_PC);
+            } else if (cg.Get("src") == "100599") {
+                resp.SetContent(TICKETS_MANY_DSTS);
+            }
+        } else if (http.Path == "/tvm/private_api/__meta__") {
+            resp.SetContent(Meta);
+        }
+        resp.AddHeader("X-Ya-Tvmtool-Data-Birthtime", IntToString<10>(Birthtime.Seconds()));
+        resp.OutTo(params.Output);
+
+        return true;
+    }
+};
+
+static inline NTvmAuth::NRoles::TEntitiesIndex CreateEntitiesIndex() {
+    using namespace NTvmAuth::NRoles;
+
+    TEntitiesIndex index(
+        {
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#11"},
+            }),
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#11"},
+                {"key#2", "value#22"},
+                {"key#3", "value#33"},
+            }),
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#11"},
+                {"key#2", "value#23"},
+                {"key#3", "value#33"},
+            }),
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#13"},
+                {"key#3", "value#33"},
+            }),
+        });
+
+    return index;
+}
diff --git a/library/cpp/tvmauth/client/ut/default_uid_checker_ut.cpp b/library/cpp/tvmauth/client/ut/default_uid_checker_ut.cpp
new file mode 100644
index 0000000000..8c48c495c4
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/default_uid_checker_ut.cpp
@@ -0,0 +1,47 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/mocked_updater.h>
+#include <library/cpp/tvmauth/client/misc/default_uid_checker.h>
+#include <library/cpp/tvmauth/client/misc/api/threaded_updater.h>
+
+#include <library/cpp/tvmauth/type.h>
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(DefaultUidChecker) {
+    Y_UNIT_TEST(Check) {
+        NRoles::TRolesPtr roles = std::make_shared<NRoles::TRoles>(
+            NRoles::TRoles::TMeta{},
+            NRoles::TRoles::TTvmConsumers{},
+            NRoles::TRoles::TUserConsumers{
+                {12345, std::make_shared<NRoles::TConsumerRoles>(
+                            THashMap<TString, NRoles::TEntitiesPtr>())},
+            },
+            std::make_shared<TString>());
+
+        TAsyncUpdaterPtr u = new TMockedUpdater({.Roles = roles});
+        auto r = u->GetRoles();
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDefaultUidChecker::Check(NUnittest::CreateUserTicket(ETicketStatus::Expired, 12345, {}), r),
+            TIllegalUsage,
+            "User ticket must be valid");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDefaultUidChecker::Check(NUnittest::CreateUserTicket(ETicketStatus::Ok, 12345, {}, {}, EBlackboxEnv::Test), r),
+            TIllegalUsage,
+            "User ticket must be from ProdYateam, got from Test");
+
+        TCheckedUserTicket ticket;
+        UNIT_ASSERT_NO_EXCEPTION(
+            ticket = TDefaultUidChecker::Check(NUnittest::CreateUserTicket(ETicketStatus::Ok, 12345, {}, {}, EBlackboxEnv::ProdYateam), r));
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, ticket.GetStatus());
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            ticket = TDefaultUidChecker::Check(NUnittest::CreateUserTicket(ETicketStatus::Ok, 9999, {}, {}, EBlackboxEnv::ProdYateam), r));
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::NoRoles, ticket.GetStatus());
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/disk_cache_ut.cpp b/library/cpp/tvmauth/client/ut/disk_cache_ut.cpp
new file mode 100644
index 0000000000..7dd851c9b3
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/disk_cache_ut.cpp
@@ -0,0 +1,204 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/logger.h>
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+#include <library/cpp/testing/unittest/tests_data.h>
+
+#include <util/stream/file.h>
+#include <util/system/fs.h>
+#include <util/system/sysstat.h>
+
+#include <thread>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientDisk) {
+    Y_UNIT_TEST(Hash) {
+        TString hash = TDiskReader::GetHash("asd");
+        UNIT_ASSERT(hash);
+        UNIT_ASSERT_VALUES_EQUAL(32, hash.size());
+        UNIT_ASSERT_VALUES_EQUAL("Zj5_qYg31bPlqjBW76z8IV0rCsHmv-iN-McV6ybS1-g", NUtils::Bin2base64url(hash));
+    }
+
+    Y_UNIT_TEST(Timestamp) {
+        time_t t = 100500;
+
+        TString s = TDiskWriter::WriteTimestamp(t);
+        UNIT_ASSERT_VALUES_EQUAL("lIgBAAAAAAA", NUtils::Bin2base64url(s));
+        UNIT_ASSERT_VALUES_EQUAL(t, TDiskReader::GetTimestamp(s));
+
+        t = 123123123213089;
+        s = TDiskWriter::WriteTimestamp(t);
+        UNIT_ASSERT_VALUES_EQUAL("IdMF1vpvAAA", NUtils::Bin2base64url(s));
+        UNIT_ASSERT_VALUES_EQUAL(t, TDiskReader::GetTimestamp(s));
+
+        t = time(nullptr);
+        s = TDiskWriter::WriteTimestamp(t);
+        UNIT_ASSERT_VALUES_EQUAL(t, TDiskReader::GetTimestamp(s));
+    }
+
+    const TInstant TIME = TInstant::Seconds(100500);
+    const TString DATA = "oiweuhn \n vw3ut hweoi uhgewproritjhwequtherwoiughfdsv 8ty34q01u   34  1=3";
+
+    Y_UNIT_TEST(ParseData_Ok) {
+        TLogger l;
+
+        const TInstant time = TInstant::Seconds(1523446554789);
+
+        TString toFile = TDiskWriter::PrepareData(time, DATA);
+        UNIT_ASSERT_VALUES_EQUAL(113, toFile.size());
+        UNIT_ASSERT_VALUES_EQUAL("T8BnRIMoC6mlMXexPg9cV5jYxeFtgDWk97JTajHDunCloH20YgEAAG9pd2V1aG4gCiB2dzN1dCBod2VvaSB1aGdld3Byb3JpdGpod2VxdXRoZXJ3b2l1Z2hmZHN2IDh0eTM0cTAxdSAgIDM0ICAxPTM",
+                                 NUtils::Bin2base64url(toFile));
+
+        TDiskReader r("qwerty", &l);
+        UNIT_ASSERT(r.ParseData(toFile));
+        UNIT_ASSERT_VALUES_EQUAL(DATA, r.Data());
+        UNIT_ASSERT_VALUES_EQUAL(time, r.Time());
+        UNIT_ASSERT_VALUES_EQUAL("6: File 'qwerty' was successfully read\n",
+                                 l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(ParseData_SmallFile) {
+        TLogger l;
+
+        TString toFile = TDiskWriter::PrepareData(TIME, DATA);
+        TDiskReader r("qwerty", &l);
+        UNIT_ASSERT(!r.ParseData(toFile.substr(0, 17)));
+        UNIT_ASSERT_VALUES_EQUAL("4: File 'qwerty' is too small\n",
+                                 l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(ParseData_Changed) {
+        TLogger l;
+
+        TString toFile = TDiskWriter::PrepareData(TIME, DATA);
+        toFile[17] = toFile[17] + 1;
+        TDiskReader r("qwerty", &l);
+        UNIT_ASSERT(!r.ParseData(toFile));
+        UNIT_ASSERT_VALUES_EQUAL("4: Content of 'qwerty' was incorrectly changed\n",
+                                 l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(Read_Ok) {
+        TLogger l;
+
+        TDiskReader r(GetFilePath("ok.cache"), &l);
+        UNIT_ASSERT(r.Read());
+        UNIT_ASSERT_VALUES_EQUAL(DATA, r.Data());
+        UNIT_ASSERT_VALUES_EQUAL(TIME, r.Time());
+        UNIT_ASSERT_C(l.Stream.Str().find("was successfully read") != TString::npos, l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(Read_NoFile) {
+        TLogger l;
+
+        TDiskReader r("missing", &l);
+        UNIT_ASSERT(!r.Read());
+        UNIT_ASSERT_VALUES_EQUAL("7: File 'missing' does not exist\n",
+                                 l.Stream.Str());
+    }
+
+#ifdef _unix_
+    Y_UNIT_TEST(Read_NoPermitions) {
+        TLogger l;
+
+        const TString path = GetWorkPath() + "/123";
+        {
+            TFileOutput output(path);
+        }
+        Chmod(path.data(), S_IWUSR);
+
+        TDiskReader r(path, &l);
+        UNIT_ASSERT(!r.Read());
+        UNIT_ASSERT_C(l.Stream.Str().find("Permission denied") != TString::npos, l.Stream.Str());
+
+        Chmod(path.data(), S_IRWXU);
+        NFs::Remove(path);
+    }
+#endif
+
+    Y_UNIT_TEST(Write_Ok) {
+        TLogger l;
+
+        const TString path = "./tmp_file";
+        TDiskWriter w(path, &l);
+        UNIT_ASSERT_C(w.Write(DATA), l.Stream.Str());
+        UNIT_ASSERT_C(l.Stream.Str().find("was successfully written") != TString::npos, l.Stream.Str());
+        l.Stream.Clear();
+
+        TDiskReader r(path, &l);
+        UNIT_ASSERT_C(r.Read(), l.Stream.Str());
+        UNIT_ASSERT_VALUES_EQUAL(DATA, r.Data());
+        UNIT_ASSERT(TInstant::Now() - r.Time() < TDuration::Minutes(5));
+        UNIT_ASSERT_C(l.Stream.Str().find("was successfully read") != TString::npos, l.Stream.Str());
+
+        NFs::Remove(path);
+    }
+
+    Y_UNIT_TEST(Write_NoPermitions) {
+        TLogger l;
+
+        TDiskWriter w("/some_file", &l);
+        UNIT_ASSERT(!w.Write(DATA));
+        UNIT_ASSERT_C(l.Stream.Str().Contains("3: Failed to write '/some_file': ("), l.Stream.Str());
+        UNIT_ASSERT_C(l.Stream.Str().Contains("denied"), l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(race) {
+        const TString path = "./tmp_file";
+        const TString data = "ejufhsadkjfvbhsaoicnaofssdahfasdfhasdofdsaf";
+        NFs::Remove(path);
+
+        std::atomic<bool> fail = false;
+        std::vector<std::thread> thrs;
+        for (size_t idx = 0; idx < 16; ++idx) {
+            thrs.push_back(std::thread([&fail, data, path]() {
+                TDiskWriter w(path);
+                for (size_t k = 0; k < 1000; ++k) {
+                    if (!w.Write(data)) {
+                        fail = true;
+                    }
+                }
+            }));
+        }
+        for (std::thread& t : thrs) {
+            t.join();
+        }
+        thrs.clear();
+        UNIT_ASSERT(fail);
+        {
+            TDiskWriter w(path);
+            UNIT_ASSERT(w.Write(data)); // checks unlocked flock
+        }
+
+        fail = false;
+
+        for (size_t idx = 0; idx < 4; ++idx) {
+            thrs.push_back(std::thread([&fail, data, path]() {
+                TLogger l;
+                TDiskReader r(path, &l);
+                for (size_t k = 0; k < 100; ++k) {
+                    if (!r.Read()) {
+                        Cerr << l.Stream.Str() << Flush;
+                        fail = true;
+                        return;
+                    }
+                    if (r.Data() != data) {
+                        Cerr << (TStringBuilder() << "'" << data << "' vs '" << r.Data() << "'" << Endl) << Flush;
+                        fail = true;
+                        return;
+                    }
+                }
+            }));
+        }
+        for (std::thread& t : thrs) {
+            t.join();
+        }
+        thrs.clear();
+        UNIT_ASSERT(!fail);
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/exponential_backoff_ut.cpp b/library/cpp/tvmauth/client/ut/exponential_backoff_ut.cpp
new file mode 100644
index 0000000000..3dcbe6ad49
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/exponential_backoff_ut.cpp
@@ -0,0 +1,44 @@
+#include <library/cpp/tvmauth/client/misc/exponential_backoff.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <thread>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(PasspUtilsExpBackoff) {
+    Y_UNIT_TEST(common) {
+        TExponentialBackoff b({TDuration::Seconds(1), TDuration::Seconds(60), 2, 0.01});
+
+        UNIT_ASSERT_VALUES_EQUAL(TDuration::Seconds(1), b.GetCurrentValue());
+
+        TDuration dur = b.GetCurrentValue();
+        for (size_t idx = 0; idx < 6; ++idx) {
+            TDuration newValue = b.Increase();
+            UNIT_ASSERT_LT(dur, newValue);
+            dur = newValue;
+        }
+
+        UNIT_ASSERT_LT(TDuration::Seconds(60) - TDuration::Seconds(3), dur);
+        UNIT_ASSERT_LT(dur, TDuration::Seconds(60) + TDuration::Seconds(3));
+    }
+
+    Y_UNIT_TEST(sleep) {
+        TExponentialBackoff b({TDuration::Seconds(60), TDuration::Seconds(600), 2, 0.01});
+
+        const TInstant start = TInstant::Now();
+
+        TAutoEvent started;
+        std::thread t([&b, &started]() {
+            started.Signal();
+            b.Sleep();
+        });
+
+        started.WaitT(TDuration::Seconds(30));
+        b.Interrupt();
+        t.join();
+        TDuration dur = TInstant::Now() - start;
+
+        UNIT_ASSERT_LT(dur, TDuration::Seconds(60));
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/facade_ut.cpp b/library/cpp/tvmauth/client/ut/facade_ut.cpp
new file mode 100644
index 0000000000..0a3013ecea
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/facade_ut.cpp
@@ -0,0 +1,205 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/facade.h>
+#include <library/cpp/tvmauth/client/mocked_updater.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/generic/vector.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientFacade) {
+    static const TTvmId OK_CLIENT = 100500;
+    static const TString SRV_TICKET_123 = "3:serv:CBAQ__________9_IgYIexCUkQY:GioCM49Ob6_f80y6FY0XBVN4hLXuMlFeyMvIMiDuQnZkbkLpRpQOuQo5YjWoBjM0Vf-XqOm8B7xtrvxSYHDD7Q4OatN2l-Iwg7i71lE3scUeD36x47st3nd0OThvtjrFx_D8mw_c0GT5KcniZlqq1SjhLyAk1b_zJsx8viRAhCU";
+    static const TString SRV_TICKET_456 = "3:serv:CBAQ__________9_IgcIyAMQlJEG:VrnqRhpoiDnJeAQbySJluJ1moQ5Kemic99iWzOrHLGfuh7iTw_xMT7KewRAmZMUwDKzE6otj7V86Xsnxbv5xZl8746wbvNcyUXu-nGWmbByZjO7xpSIcY07sISqEhP9n9C_yMSvqDP7ho_PRIfpGCDMXxKlFZ_BhBLLp0kHEvw4";
+    static const TString PROD_TICKET = "3:user:CAsQ__________9_Gg4KAgh7EHsg0oXYzAQoAA:N8PvrDNLh-5JywinxJntLeQGDEHBUxfzjuvB8-_BEUv1x9CALU7do8irDlDYVeVVDr4AIpR087YPZVzWPAqmnBuRJS0tJXekmDDvrivLnbRrzY4IUXZ_fImB0fJhTyVetKv6RD11bGqnAJeDpIukBwPTbJc_EMvKDt8V490CJFw";
+    static const TString TEST_TICKET = "3:user:CA0Q__________9_Gg4KAgh7EHsg0oXYzAQoAQ:FSADps3wNGm92Vyb1E9IVq5M6ZygdGdt1vafWWEhfDDeCLoVA-sJesxMl2pGW4OxJ8J1r_MfpG3ZoBk8rLVMHUFrPa6HheTbeXFAWl8quEniauXvKQe4VyrpA1SPgtRoFqi5upSDIJzEAe1YRJjq1EClQ_slMt8R0kA_JjKUX54";
+
+    TTvmClient GetClient(const NTvmApi::TClientSettings& s) {
+        auto l = MakeIntrusive<TLogger>();
+        TTvmClient f(s, l);
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, f.GetStatus());
+        Sleep(TDuration::MilliSeconds(300));
+        TString logs = l->Stream.Str();
+        UNIT_ASSERT_C(logs.find("was successfully read") != TString::npos, logs);
+        UNIT_ASSERT_C(logs.find("was successfully fetched") == TString::npos, logs);
+        return f;
+    }
+
+    Y_UNIT_TEST(Service) {
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = GetCachePath(),
+            .SelfTvmId = OK_CLIENT,
+            .CheckServiceTickets = true,
+        };
+        TTvmClient f = GetClient(s);
+
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(2524608000), f.GetUpdateTimeOfPublicKeys());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), f.GetUpdateTimeOfServiceTickets());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(2525126400), f.GetInvalidationTimeOfPublicKeys());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), f.GetInvalidationTimeOfServiceTickets());
+
+        UNIT_ASSERT(f.CheckServiceTicket(SRV_TICKET_123));
+        UNIT_ASSERT_EXCEPTION(f.CheckUserTicket(PROD_TICKET), yexception);
+        UNIT_ASSERT_EXCEPTION(f.CheckUserTicket(TEST_TICKET), yexception);
+    }
+
+    Y_UNIT_TEST(User) {
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = GetCachePath(),
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Prod,
+        };
+
+        TTvmClient f = GetClient(s);
+        UNIT_ASSERT_EXCEPTION(f.CheckServiceTicket(SRV_TICKET_123), yexception);
+        UNIT_ASSERT(f.CheckUserTicket(PROD_TICKET));
+        UNIT_ASSERT(!f.CheckUserTicket(TEST_TICKET));
+    }
+
+    Y_UNIT_TEST(Ctors) {
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = GetCachePath(),
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Prod,
+        };
+
+        TTvmClient f = GetClient(s);
+        f = GetClient(s);
+
+        TVector<TTvmClient> v;
+        v.push_back(std::move(f));
+        v.front() = std::move(*v.begin());
+    }
+
+    Y_UNIT_TEST(Tickets) {
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = GetCachePath(),
+            .SelfTvmId = OK_CLIENT,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+        };
+        TTvmClient f = GetClient(s);
+
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), f.GetUpdateTimeOfPublicKeys());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::ParseIso8601("2050-01-01T00:00:00.000000Z"), f.GetUpdateTimeOfServiceTickets());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), f.GetInvalidationTimeOfPublicKeys());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(std::numeric_limits<size_t>::max()), f.GetInvalidationTimeOfServiceTickets());
+
+        UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIKhCUkQY:CX", f.GetServiceTicketFor("blackbox"));
+        UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIKhCUkQY:CX", f.GetServiceTicketFor(19));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(f.GetServiceTicketFor("blackbox2"),
+                                       TBrokenTvmClientSettings,
+                                       "Destination 'blackbox2' was not specified in settings. Check your settings (if you use Qloud/YP/tvmtool - check it's settings)");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(f.GetServiceTicketFor(20),
+                                       TBrokenTvmClientSettings,
+                                       "Destination '20' was not specified in settings. Check your settings (if you use Qloud/YP/tvmtool - check it's settings)");
+    }
+
+    Y_UNIT_TEST(Tool) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+
+        NTvmTool::TClientSettings s("push-client");
+        s.SetPort(port);
+        s.SetAuthToken(AUTH_TOKEN);
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TTvmClient f(s, l);
+
+            UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(14380887840), f.GetUpdateTimeOfPublicKeys());
+            UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(14380887840), f.GetUpdateTimeOfServiceTickets());
+            UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(14381406240), f.GetInvalidationTimeOfPublicKeys());
+            UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(std::numeric_limits<time_t>::max()), f.GetInvalidationTimeOfServiceTickets());
+
+            UNIT_ASSERT_VALUES_EQUAL(SERVICE_TICKET_PC, f.GetServiceTicketFor("pass_likers"));
+            UNIT_ASSERT_VALUES_EQUAL(SERVICE_TICKET_PC, f.GetServiceTicketFor(100502));
+            UNIT_ASSERT_EXCEPTION_CONTAINS(f.GetServiceTicketFor("blackbox"),
+                                           TBrokenTvmClientSettings,
+                                           "Destination 'blackbox' was not specified in settings. Check your settings (if you use Qloud/YP/tvmtool - check it's settings)");
+            UNIT_ASSERT_EXCEPTION_CONTAINS(f.GetServiceTicketFor(242),
+                                           TBrokenTvmClientSettings,
+                                           "Destination '242' was not specified in settings. Check your settings (if you use Qloud/YP/tvmtool - check it's settings)");
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100501, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[(pass_likers:100502)]\n"
+                << "7: Tickets fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Public keys fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(CheckRoles) {
+        { // roles not configured
+            TTvmClient f(new TMockedUpdater(TMockedUpdater::TSettings{
+                .SelfTvmId = OK_CLIENT,
+            }));
+
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok,
+                                     f.CheckServiceTicket(SRV_TICKET_123).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok,
+                                     f.CheckServiceTicket(SRV_TICKET_456).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Malformed,
+                                     f.CheckServiceTicket("asdfg").GetStatus());
+        }
+
+        { // roles configured
+            NRoles::TRolesPtr roles = std::make_shared<NRoles::TRoles>(
+                NRoles::TRoles::TMeta{},
+                NRoles::TRoles::TTvmConsumers{
+                    {123, std::make_shared<NRoles::TConsumerRoles>(
+                              THashMap<TString, NRoles::TEntitiesPtr>())},
+                },
+                NRoles::TRoles::TUserConsumers{},
+                std::make_shared<TString>());
+            TTvmClient f(new TMockedUpdater(TMockedUpdater::TSettings{
+                .SelfTvmId = OK_CLIENT,
+                .Roles = roles,
+            }));
+
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok,
+                                     f.CheckServiceTicket(SRV_TICKET_123).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::NoRoles,
+                                     f.CheckServiceTicket(SRV_TICKET_456).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Malformed,
+                                     f.CheckServiceTicket("asdfg").GetStatus());
+        }
+    }
+
+    Y_UNIT_TEST(CheckDst) {
+        {
+            TTvmClient f(new TMockedUpdater(TMockedUpdater::TSettings{
+                .SelfTvmId = OK_CLIENT,
+            }));
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, f.CheckServiceTicket(SRV_TICKET_123).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, f.CheckServiceTicket(SRV_TICKET_456).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Malformed, f.CheckServiceTicket("asdfg").GetStatus());
+        }
+        TTvmId NOT_OK_CLIENT = 3333;
+        {
+            TTvmClient f(new TMockedUpdater(TMockedUpdater::TSettings{
+                .SelfTvmId = NOT_OK_CLIENT,
+            }));
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::InvalidDst, f.CheckServiceTicket(SRV_TICKET_123).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::InvalidDst, f.CheckServiceTicket(SRV_TICKET_456).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Malformed, f.CheckServiceTicket("asdfg").GetStatus());
+        }
+        {
+            TServiceContext::TCheckFlags checkFlags;
+            checkFlags.NeedDstCheck = false;
+            TTvmClient f(
+                new TMockedUpdater(
+                    TMockedUpdater::TSettings{
+                        .SelfTvmId = NOT_OK_CLIENT}),
+                checkFlags);
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, f.CheckServiceTicket(SRV_TICKET_123).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, f.CheckServiceTicket(SRV_TICKET_456).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Malformed, f.CheckServiceTicket("asdfg").GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(f.CheckServiceTicket(SRV_TICKET_123).GetDst(), OK_CLIENT);
+        }
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/files/ok.cache b/library/cpp/tvmauth/client/ut/files/ok.cache
new file mode 100644
index 0000000000..768d4953d1
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/files/ok.cache
diff --git a/library/cpp/tvmauth/client/ut/files/public_keys b/library/cpp/tvmauth/client/ut/files/public_keys
new file mode 100644
index 0000000000..fa683d18f3
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/files/public_keys
diff --git a/library/cpp/tvmauth/client/ut/files/roles b/library/cpp/tvmauth/client/ut/files/roles
new file mode 100644
index 0000000000..36864ae50a
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/files/roles
diff --git a/library/cpp/tvmauth/client/ut/files/service_tickets b/library/cpp/tvmauth/client/ut/files/service_tickets
new file mode 100644
index 0000000000..7a6985a34d
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/files/service_tickets
diff --git a/library/cpp/tvmauth/client/ut/last_error_ut.cpp b/library/cpp/tvmauth/client/ut/last_error_ut.cpp
new file mode 100644
index 0000000000..6751e78be7
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/last_error_ut.cpp
@@ -0,0 +1,56 @@
+#include <library/cpp/tvmauth/client/misc/last_error.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(LastError) {
+    Y_UNIT_TEST(common) {
+        TLastError le;
+
+        UNIT_ASSERT_VALUES_EQUAL("OK",
+                                 le.GetLastError(true));
+        UNIT_ASSERT_VALUES_EQUAL("Internal client error: failed to collect last useful error message, please report this message to tvm-dev@yandex-team.ru",
+                                 le.GetLastError(false));
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(le.ThrowLastError(),
+                                       TNonRetriableException,
+                                       "Internal client error: failed to collect last useful error message");
+
+        le.ProcessError(TLastError::EType::Retriable, TLastError::EScope::PublicKeys, "err_re#1");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_re#1",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::Retriable, TLastError::EScope::PublicKeys, "err_re#2");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_re#2",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::NonRetriable, TLastError::EScope::PublicKeys, "err_nonre#3");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#3",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::NonRetriable, TLastError::EScope::PublicKeys, "err_nonre#4");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#4",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::Retriable, TLastError::EScope::PublicKeys, "err_re#5");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#4",
+                                 le.GetLastError(false));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(le.ThrowLastError(),
+                                       TNonRetriableException,
+                                       "Failed to start TvmClient. Do not retry: PublicKeys: err_nonre#4");
+
+        le.ProcessError(TLastError::EType::Retriable, TLastError::EScope::ServiceTickets, "err_re#6");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#4",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::Retriable, TLastError::EScope::ServiceTickets, "err_re#7");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#4",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::NonRetriable, TLastError::EScope::ServiceTickets, "err_nonre#8");
+        UNIT_ASSERT_VALUES_EQUAL("ServiceTickets: err_nonre#8",
+                                 le.GetLastError(false));
+
+        le.ClearError(TLastError::EScope::ServiceTickets);
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#4",
+                                 le.GetLastError(false));
+        le.ClearError(TLastError::EScope::PublicKeys);
+        UNIT_ASSERT_VALUES_EQUAL("Internal client error: failed to collect last useful error message, please report this message to tvm-dev@yandex-team.ru",
+                                 le.GetLastError(false));
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/logger_ut.cpp b/library/cpp/tvmauth/client/ut/logger_ut.cpp
new file mode 100644
index 0000000000..76236e8913
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/logger_ut.cpp
@@ -0,0 +1,43 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientLogger) {
+    int i = 0;
+
+    Y_UNIT_TEST(Debug) {
+        TLogger l;
+        l.Debug("qwerty");
+        UNIT_ASSERT_VALUES_EQUAL("7: qwerty\n", l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(Info) {
+        TLogger l;
+        l.Info("qwerty");
+        UNIT_ASSERT_VALUES_EQUAL("6: qwerty\n", l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(Warning) {
+        TLogger l;
+        l.Warning("qwerty");
+        UNIT_ASSERT_VALUES_EQUAL("4: qwerty\n", l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(Error) {
+        TLogger l;
+        l.Error("qwerty");
+        UNIT_ASSERT_VALUES_EQUAL("3: qwerty\n", l.Stream.Str());
+    }
+
+#ifdef _unix_
+    Y_UNIT_TEST(Cerr_) {
+        TCerrLogger l(5);
+        l.Error("hit");
+        l.Debug("miss");
+    }
+#endif
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/decoder_ut.cpp b/library/cpp/tvmauth/client/ut/roles/decoder_ut.cpp
new file mode 100644
index 0000000000..0ee5fc7cb7
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/decoder_ut.cpp
@@ -0,0 +1,163 @@
+#include <library/cpp/tvmauth/client/exception.h>
+#include <library/cpp/tvmauth/client/misc/roles/decoder.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NRoles;
+
+Y_UNIT_TEST_SUITE(Decoder) {
+    const TString BROTLI = NUtils::Base64url2bin("GyMAAAR0Y6ku58ObclAQzDweUSUwbdqc5yOOKgI");
+    const TString GZIP = NUtils::Base64url2bin("H4sIAAAAAAAA_yrOz01VKEstqkTGCpm5BflFJYl5JQpJOflJgAAAAP__MbeeiSQAAAA");
+    const TString ZSTD = NUtils::Base64url2bin("KLUv_QBY9AAAwHNvbWUgdmVyeSBpbXBvcnRhbnQgYmxvYgEAc-4IAQAA");
+
+    Y_UNIT_TEST(Decode) {
+        // Errs
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::Decode(
+                "1:brotli:10000:88839244E8C7C426B20729AF1A13AD792C5FA83C7F2FB6ADCFC60DA1B5EF9603",
+                TString(BROTLI)),
+            yexception,
+            "Decoded blob has bad size: expected 10000, actual 36");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::Decode(
+                "1:brotli:36:88839244E8C7C426B20729AF1A13AD792C5FA83C7F2FB6ADCFC60DA1B5EF0000",
+                TString(BROTLI)),
+            yexception,
+            "Decoded blob has bad sha256");
+
+        // OK
+        TString decoded;
+        UNIT_ASSERT_NO_EXCEPTION(
+            decoded = TDecoder::Decode("", "some veryveryveryvery important blob"));
+        UNIT_ASSERT_VALUES_EQUAL(decoded, "some veryveryveryvery important blob");
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            decoded = TDecoder::Decode(
+                "1:brotli:36:88839244E8C7C426B20729AF1A13AD792C5FA83C7F2FB6ADCFC60DA1B5EF9603",
+                TString(BROTLI)));
+        UNIT_ASSERT_VALUES_EQUAL(decoded, "some veryveryveryvery important blob");
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            decoded = TDecoder::Decode(
+                "1:gzip:36:88839244E8C7C426B20729AF1A13AD792C5FA83C7F2FB6ADCFC60DA1B5EF9603",
+                TString(GZIP)));
+        UNIT_ASSERT_VALUES_EQUAL(decoded, "some veryveryveryvery important blob");
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            decoded = TDecoder::Decode(
+                "1:zstd:36:88839244E8C7C426B20729AF1A13AD792C5FA83C7F2FB6ADCFC60DA1B5EF9603",
+                TString(ZSTD)));
+        UNIT_ASSERT_VALUES_EQUAL(decoded, "some veryveryveryvery important blob");
+    }
+
+    Y_UNIT_TEST(UnknownCodecs) {
+        for (const TStringBuf codec : {"lz", "lzma", "kek"}) {
+            UNIT_ASSERT_EXCEPTION_CONTAINS(
+                TDecoder::DecodeImpl(codec, ""),
+                yexception,
+                TStringBuilder() << "unknown codec: '" << codec << "'");
+        }
+    }
+
+    Y_UNIT_TEST(ParseCodec) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::ParseCodec("2:kek"),
+            yexception,
+            "unknown codec format version; known: 1; got: 2");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::ParseCodec("1:::"),
+            yexception,
+            "codec type is empty");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::ParseCodec("1:some_codec:asd:"),
+            yexception,
+            "decoded blob size is not number");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::ParseCodec("1:some_codec:789:qwe"),
+            yexception,
+            "sha256 of decoded blob has invalid length: expected 64, got 3");
+
+        TDecoder::TCodecInfo info;
+        UNIT_ASSERT_NO_EXCEPTION(
+            info = TDecoder::ParseCodec("1:some_codec:789:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"));
+
+        UNIT_ASSERT_VALUES_EQUAL("some_codec", info.Type);
+        UNIT_ASSERT_VALUES_EQUAL(789, info.Size);
+        UNIT_ASSERT_VALUES_EQUAL("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+                                 info.Sha256);
+    }
+
+    Y_UNIT_TEST(DecodeBrolti) {
+        UNIT_ASSERT_EXCEPTION(
+            TDecoder::DecodeBrolti(""),
+            yexception);
+
+        TString blob;
+        UNIT_ASSERT_NO_EXCEPTION(
+            blob = TDecoder::DecodeBrolti(
+                TString(BROTLI)));
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "some veryveryveryvery important blob",
+            blob);
+    }
+
+    Y_UNIT_TEST(DecodeGzip) {
+        TString blob;
+        UNIT_ASSERT_NO_EXCEPTION(blob = TDecoder::DecodeGzip(""));
+        UNIT_ASSERT_VALUES_EQUAL("", blob);
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            blob = TDecoder::DecodeGzip(
+                TString(GZIP)));
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "some veryveryveryvery important blob",
+            blob);
+    }
+
+    Y_UNIT_TEST(DecodeZstd) {
+        TString blob;
+        UNIT_ASSERT_NO_EXCEPTION(blob = TDecoder::DecodeZstd(""));
+        UNIT_ASSERT_VALUES_EQUAL("", blob);
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            blob = TDecoder::DecodeZstd(
+                TString(ZSTD)));
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "some veryveryveryvery important blob",
+            blob);
+    }
+
+    Y_UNIT_TEST(VerifySize) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::VerifySize("qwerty", 100),
+            yexception,
+            TStringBuilder() << "Decoded blob has bad size: expected 100, actual 6");
+
+        UNIT_ASSERT_NO_EXCEPTION(TDecoder::VerifySize("qwert", 5));
+    }
+
+    Y_UNIT_TEST(VerifyChecksum) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::VerifyChecksum("qwerty", "zzzz"),
+            yexception,
+            "Decoded blob has bad sha256: expected=zzzz,"
+            " actual=65E84BE33532FB784C48129675F9EFF3A682B27168C0EA744B2CF58EE02337C5");
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            TDecoder::VerifyChecksum("qwerty",
+                                     "65E84BE33532FB784C48129675F9EFF3A682B27168C0EA744B2CF58EE02337C5"));
+        UNIT_ASSERT_NO_EXCEPTION(
+            TDecoder::VerifyChecksum("qwerty",
+                                     "65e84be33532fb784c48129675f9eff3a682b27168c0ea744b2cf58ee02337c5"));
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/entities_index_ut.cpp b/library/cpp/tvmauth/client/ut/roles/entities_index_ut.cpp
new file mode 100644
index 0000000000..7e62a87b64
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/entities_index_ut.cpp
@@ -0,0 +1,358 @@
+#include <library/cpp/tvmauth/client/ut/common.h>
+
+#include <library/cpp/tvmauth/client/misc/roles/entities_index.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <array>
+
+using namespace NTvmAuth::NRoles;
+
+Y_UNIT_TEST_SUITE(RolesEntitiesIndex) {
+    Y_UNIT_TEST(Stage) {
+        TEntitiesIndex::TStage stage({
+            "key#1",
+            "key#2",
+            "key#3",
+            "key#4",
+        });
+
+        const std::vector<std::vector<TString>> results = {
+            {"key#1"},
+            {"key#2"},
+            {"key#1", "key#2"},
+            {"key#3"},
+            {"key#1", "key#3"},
+            {"key#2", "key#3"},
+            {"key#1", "key#2", "key#3"},
+            {"key#4"},
+            {"key#1", "key#4"},
+            {"key#2", "key#4"},
+            {"key#1", "key#2", "key#4"},
+            {"key#3", "key#4"},
+            {"key#1", "key#3", "key#4"},
+            {"key#2", "key#3", "key#4"},
+            {"key#1", "key#2", "key#3", "key#4"},
+        };
+
+        std::vector<TString> keys;
+        for (const std::vector<TString>& res : results) {
+            UNIT_ASSERT(stage.GetNextKeySet(keys));
+            UNIT_ASSERT_VALUES_EQUAL(keys, res);
+        }
+
+        UNIT_ASSERT_C(!stage.GetNextKeySet(keys), keys);
+    }
+
+    Y_UNIT_TEST(GetUniqueSortedKeys) {
+        std::vector<TEntityPtr> entities;
+
+        UNIT_ASSERT_VALUES_EQUAL(std::set<TString>(),
+                                 TEntitiesIndex::GetUniqueSortedKeys(entities));
+
+        entities = {
+            std::make_shared<TEntity>(),
+        };
+        UNIT_ASSERT_VALUES_EQUAL(std::set<TString>(),
+                                 TEntitiesIndex::GetUniqueSortedKeys(entities));
+
+        entities = {
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#1"},
+            }),
+        };
+        UNIT_ASSERT_VALUES_EQUAL(std::set<TString>({
+                                     "key#1",
+                                 }),
+                                 TEntitiesIndex::GetUniqueSortedKeys(entities));
+
+        entities = {
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#1"},
+            }),
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#11"},
+                {"key#2", "value#22"},
+            }),
+        };
+        UNIT_ASSERT_VALUES_EQUAL(std::set<TString>({
+                                     "key#1",
+                                     "key#2",
+                                 }),
+                                 TEntitiesIndex::GetUniqueSortedKeys(entities));
+    }
+
+    Y_UNIT_TEST(MakeUnique) {
+        const TEntityPtr entityA = std::make_shared<TEntity>(TEntity{{"key#1", "aaaa"}});
+        const TEntityPtr entityA2 = std::make_shared<TEntity>(TEntity{{"key#1", "aaaa"}});
+        const TEntityPtr entityB = std::make_shared<TEntity>(TEntity{{"key#1", "bbbb"}});
+
+        TEntitiesIndex::TSubTree idx = {
+            std::vector<TEntityPtr>{
+                entityA,
+                entityA,
+            },
+            TEntitiesIndex::TIdxByAttrs{
+                {
+                    TKeyValue{"key#1", "value#11"},
+                    TEntitiesIndex::TSubTree{
+                        std::vector<TEntityPtr>{
+                            entityA,
+                            entityB,
+                            entityA,
+                        },
+                        TEntitiesIndex::TIdxByAttrs{
+                            {
+                                TKeyValue{"key#2", "value#21"},
+                                TEntitiesIndex::TSubTree{
+                                    std::vector<TEntityPtr>{
+                                        entityA,
+                                        entityB,
+                                        entityA,
+                                    },
+                                    TEntitiesIndex::TIdxByAttrs{},
+                                },
+                            },
+                        },
+                    },
+                },
+                {
+                    TKeyValue{"key#1", "value#12"},
+                    TEntitiesIndex::TSubTree{
+                        std::vector<TEntityPtr>{
+                            entityA,
+                            entityB,
+                            entityA2,
+                        },
+                        TEntitiesIndex::TIdxByAttrs{},
+                    },
+                },
+            },
+        };
+
+        TEntitiesIndex::MakeUnique(idx);
+
+        UNIT_ASSERT_VALUES_EQUAL(idx.Entities.size(), 1);
+
+        auto it = idx.SubTree.find(TKeyValue{"key#1", "value#12"});
+        UNIT_ASSERT(it != idx.SubTree.end());
+        UNIT_ASSERT_VALUES_EQUAL(it->second.Entities.size(), 2);
+
+        it = idx.SubTree.find(TKeyValue{"key#1", "value#11"});
+        UNIT_ASSERT(it != idx.SubTree.end());
+        UNIT_ASSERT_VALUES_EQUAL(it->second.Entities.size(), 2);
+
+        it = it->second.SubTree.find(TKeyValue{"key#2", "value#21"});
+        UNIT_ASSERT(it != it->second.SubTree.end());
+        UNIT_ASSERT_VALUES_EQUAL(it->second.Entities.size(), 2);
+    }
+
+    Y_UNIT_TEST(GetByAttrs) {
+        const TEntitiesIndex index = CreateEntitiesIndex();
+
+        UNIT_ASSERT_STRINGS_EQUAL(
+            index.PrintDebugString(),
+            R"(
+"key#1/value#11"
+    "key#2/value#22"
+        "key#3/value#33"
+    "key#2/value#23"
+        "key#3/value#33"
+    "key#3/value#33"
+"key#1/value#13"
+    "key#3/value#33"
+"key#2/value#22"
+    "key#3/value#33"
+"key#2/value#23"
+    "key#3/value#33"
+"key#3/value#33"
+)");
+
+        struct TCase {
+            TEntity AttrsToFind;
+            std::vector<TEntity> Result;
+        };
+
+        std::vector<TCase> cases = {
+            {
+                TEntity{},
+                std::vector<TEntity>{
+                    TEntity{
+                        {"key#1", "value#11"},
+                    },
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#22"},
+                        {"key#3", "value#33"},
+                    },
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#23"},
+                        {"key#3", "value#33"},
+                    },
+                    TEntity{
+                        {"key#1", "value#13"},
+                        {"key#3", "value#33"},
+                    },
+                },
+            },
+            {
+                TEntity{
+                    {"key#1", "value#11"},
+                },
+                std::vector<TEntity>{
+                    TEntity{
+                        {"key#1", "value#11"},
+                    },
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#22"},
+                        {"key#3", "value#33"},
+                    },
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#23"},
+                        {"key#3", "value#33"},
+                    },
+                },
+            },
+            {
+                TEntity{
+                    {"key#1", "value#13"},
+                },
+                std::vector<TEntity>{
+                    TEntity{
+                        {"key#1", "value#13"},
+                        {"key#3", "value#33"},
+                    },
+                },
+            },
+            {
+                TEntity{
+                    {"key#1", "value#14"},
+                },
+                std::vector<TEntity>{},
+            },
+            {
+                TEntity{
+                    {"key#2", "value#22"},
+                },
+                std::vector<TEntity>{
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#22"},
+                        {"key#3", "value#33"},
+                    },
+                },
+            },
+            {
+                TEntity{
+                    {"key#3", "value#33"},
+                },
+                std::vector<TEntity>{
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#22"},
+                        {"key#3", "value#33"},
+                    },
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#23"},
+                        {"key#3", "value#33"},
+                    },
+                    TEntity{
+                        {"key#1", "value#13"},
+                        {"key#3", "value#33"},
+                    },
+                },
+            },
+        };
+
+        for (const TCase& c : cases) {
+            std::vector<TEntityPtr> expected;
+            for (const TEntity& e : c.Result) {
+                expected.push_back(std::make_shared<TEntity>(e));
+            }
+
+            UNIT_ASSERT_VALUES_EQUAL_C(
+                index.GetEntitiesWithAttrs(c.AttrsToFind.begin(), c.AttrsToFind.end()),
+                expected,
+                "'" << c.AttrsToFind << "'");
+        }
+    }
+
+    Y_UNIT_TEST(Contains) {
+        const TEntitiesIndex index = CreateEntitiesIndex();
+
+        struct TCase {
+            TEntity Exact;
+            bool Result = false;
+        };
+
+        std::vector<TCase> cases = {
+            {
+                TEntity{},
+                false,
+            },
+            {
+                TEntity{
+                    {"key#1", "value#11"},
+                },
+                true,
+            },
+            {
+                TEntity{
+                    {"key#1", "value#13"},
+                },
+                false,
+            },
+            {
+                TEntity{
+                    {"key#1", "value#13"},
+                    {"key#3", "value#33"},
+                },
+                true,
+            },
+        };
+
+        for (const TCase& c : cases) {
+            UNIT_ASSERT_VALUES_EQUAL_C(
+                index.ContainsExactEntity(c.Exact.begin(), c.Exact.end()),
+                c.Result,
+                "'" << c.Exact << "'");
+        }
+    }
+}
+
+template <>
+void Out<std::vector<TString>>(IOutputStream& o, const std::vector<TString>& s) {
+    for (const auto& key : s) {
+        o << key << ",";
+    }
+}
+
+template <>
+void Out<std::set<TString>>(IOutputStream& o, const std::set<TString>& s) {
+    for (const auto& key : s) {
+        o << key << ",";
+    }
+}
+
+template <>
+void Out<std::vector<TEntityPtr>>(IOutputStream& o, const std::vector<TEntityPtr>& v) {
+    for (const TEntityPtr& p : v) {
+        o << *p << Endl;
+    }
+}
+
+template <>
+void Out<TEntityPtr>(IOutputStream& o, const TEntityPtr& v) {
+    o << *v;
+}
+
+template <>
+void Out<TEntity>(IOutputStream& o, const TEntity& v) {
+    for (const auto& [key, value] : v) {
+        o << key << "->" << value << Endl;
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/parser_ut.cpp b/library/cpp/tvmauth/client/ut/roles/parser_ut.cpp
new file mode 100644
index 0000000000..4a2afac483
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/parser_ut.cpp
@@ -0,0 +1,161 @@
+#include <library/cpp/tvmauth/client/misc/roles/parser.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/json/json_reader.h>
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NRoles;
+
+Y_UNIT_TEST_SUITE(Parser) {
+    static NJson::TJsonValue ToJsonValue(TStringBuf body) {
+        NJson::TJsonValue doc;
+        UNIT_ASSERT(NJson::ReadJsonTree(body, &doc));
+        return doc;
+    }
+
+    Y_UNIT_TEST(GetEntity) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetEntity(ToJsonValue(R"({"scope": false})"),
+                               "cons",
+                               "read"),
+            yexception,
+            "entity is map (str->str), got value Boolean. consumer 'cons' with role 'read'");
+
+        TEntityPtr en;
+        UNIT_ASSERT_NO_EXCEPTION(
+            en = TParser::GetEntity(ToJsonValue(R"({})"),
+                                    "cons",
+                                    "read"));
+        UNIT_ASSERT_VALUES_EQUAL(en->size(), 0);
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            en = TParser::GetEntity(ToJsonValue(R"({"key1": "val1", "key2": "val2"})"),
+                                    "cons",
+                                    "read"));
+        UNIT_ASSERT_VALUES_EQUAL(en->size(), 2);
+    }
+
+    Y_UNIT_TEST(GetEntities) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetEntities(ToJsonValue(R"([{},[]])"),
+                                 "cons",
+                                 "read"),
+            yexception,
+            "role entity for role must be map: consumer 'cons' with role 'read' has Array");
+
+        TEntitiesPtr en;
+        UNIT_ASSERT_NO_EXCEPTION(
+            en = TParser::GetEntities(ToJsonValue(R"([])"),
+                                      "cons",
+                                      "read"));
+        UNIT_ASSERT(!en->Contains({}));
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            en = TParser::GetEntities(ToJsonValue(R"([{}])"),
+                                      "cons",
+                                      "read"));
+        UNIT_ASSERT(en->Contains({}));
+    }
+
+    Y_UNIT_TEST(GetConsumer) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumer(ToJsonValue(R"({"role1": [],"role2": {}})"),
+                                 "cons"),
+            yexception,
+            "entities for roles must be array: 'role2' is Map");
+
+        TConsumerRolesPtr c;
+        UNIT_ASSERT_NO_EXCEPTION(
+            c = TParser::GetConsumer(ToJsonValue(R"({"role1": [],"role2": []})"),
+                                     "cons"));
+        UNIT_ASSERT_EQUAL(c->GetRoles().size(), 2);
+        UNIT_ASSERT(c->HasRole("role1"));
+        UNIT_ASSERT(c->HasRole("role2"));
+        UNIT_ASSERT(!c->HasRole("role3"));
+    }
+
+    Y_UNIT_TEST(GetConsumers) {
+        TRoles::TTvmConsumers cons;
+        UNIT_ASSERT_NO_EXCEPTION(
+            cons = TParser::GetConsumers<TTvmId>(ToJsonValue(R"({})"),
+                                                 "tvm"));
+        UNIT_ASSERT_VALUES_EQUAL(0, cons.size());
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            cons = TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {}})"),
+                                                 "tvm"));
+        UNIT_ASSERT_VALUES_EQUAL(0, cons.size());
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": []})"),
+                                          "tvm"),
+            yexception,
+            "'tvm' must be object");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {"asd": []}})"),
+                                          "tvm"),
+            yexception,
+            "roles for consumer must be map: 'asd' is Array");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {"asd": {}}})"),
+                                          "tvm"),
+            yexception,
+            "id must be valid positive number of proper size for tvm. got 'asd'");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {"1120000000001062": {}}})"),
+                                          "tvm"),
+            yexception,
+            "id must be valid positive number of proper size for tvm. got '1120000000001062'");
+        UNIT_ASSERT_NO_EXCEPTION(
+            TParser::GetConsumers<TUid>(ToJsonValue(R"({"user": {"1120000000001062": {}}})"),
+                                        "user"));
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {"42": {}, "042": {}}})"),
+                                          "tvm"),
+            yexception,
+            "consumer duplicate detected: '42' for tvm");
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            cons = TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {"42": {}}})"),
+                                                 "tvm"));
+        UNIT_ASSERT_VALUES_EQUAL(1, cons.size());
+    }
+
+    Y_UNIT_TEST(GetMeta) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetMeta(ToJsonValue(R"({})")),
+            yexception,
+            "Missing 'revision'");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetMeta(ToJsonValue(R"({"revision": null})")),
+            yexception,
+            "'revision' has unexpected type: Null");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetMeta(ToJsonValue(R"({"revision": 100500})")),
+            yexception,
+            "Missing 'born_date'");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetMeta(ToJsonValue(R"({"revision": 100500, "born_date": false})")),
+            yexception,
+            "key 'born_date' must be uint");
+
+        TRoles::TMeta meta;
+        UNIT_ASSERT_NO_EXCEPTION(
+            meta = TParser::GetMeta(ToJsonValue(R"({"revision": 100500, "born_date": 42})")));
+        UNIT_ASSERT_VALUES_EQUAL("100500", meta.Revision);
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(42), meta.BornTime);
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            meta = TParser::GetMeta(ToJsonValue(R"({"revision": "100501", "born_date": 42})")));
+        UNIT_ASSERT_VALUES_EQUAL("100501", meta.Revision);
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(42), meta.BornTime);
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/roles_ut.cpp b/library/cpp/tvmauth/client/ut/roles/roles_ut.cpp
new file mode 100644
index 0000000000..d485dd857a
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/roles_ut.cpp
@@ -0,0 +1,419 @@
+#include <library/cpp/tvmauth/client/ut/common.h>
+
+#include <library/cpp/tvmauth/client/exception.h>
+#include <library/cpp/tvmauth/client/misc/roles/roles.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <array>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NRoles;
+
+Y_UNIT_TEST_SUITE(Roles) {
+    Y_UNIT_TEST(EntContains) {
+        TEntities ent(CreateEntitiesIndex());
+
+        UNIT_ASSERT(ent.Contains({{"key#1", "value#11"}}));
+        UNIT_ASSERT(ent.Contains({
+            {"key#1", "value#13"},
+            {"key#3", "value#33"},
+        }));
+        UNIT_ASSERT(!ent.Contains({{"key#111", "value#11"}}));
+        UNIT_ASSERT(!ent.Contains({
+            {"key#111", "value#13"},
+            {"key#3", "value#33"},
+        }));
+
+        // valid calls
+        {
+            std::array<const std::pair<TStringBuf, TString>, 1> arr = {{{"key#1", "value#11"}}};
+            UNIT_ASSERT(ent.ContainsSortedUnique<TStringBuf>({arr.begin(), arr.end()}));
+        }
+        {
+            std::array<const std::pair<TString, TStringBuf>, 2> arr = {{
+                {"key#1", "value#13"},
+                {"key#3", "value#33"},
+            }};
+            bool res = ent.ContainsSortedUnique<TString, TStringBuf>({arr.begin(), arr.end()});
+            UNIT_ASSERT(res);
+        }
+        {
+            std::array<const std::pair<TStringBuf, TStringBuf>, 1> arr = {{{"key#111", "value#11"}}};
+            bool res = ent.ContainsSortedUnique<TStringBuf, TStringBuf>({arr.begin(), arr.end()});
+            UNIT_ASSERT(!res);
+        }
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#111", "value#13"},
+                {"key#3", "value#33"},
+            }};
+            UNIT_ASSERT(!ent.ContainsSortedUnique({arr.begin(), arr.end()}));
+        }
+
+        // invalid calls
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#3", "value#33"},
+                {"key#1", "value#13"},
+            }};
+            UNIT_ASSERT_EXCEPTION_CONTAINS(
+                ent.ContainsSortedUnique({arr.begin(), arr.end()}),
+                TIllegalUsage,
+                "attrs are not sorted: 'key#3' before 'key#1'");
+        }
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#1", "value#13"},
+                {"key#1", "value#13"},
+            }};
+            UNIT_ASSERT_EXCEPTION_CONTAINS(
+                ent.ContainsSortedUnique({arr.begin(), arr.end()}),
+                TIllegalUsage,
+                "attrs are not unique: 'key#1'");
+        }
+    }
+
+    Y_UNIT_TEST(EntWithAttrs) {
+        TEntities ent(CreateEntitiesIndex());
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            ent.GetEntitiesWithAttrs({{"key#1", "value#11"}}),
+            std::vector<TEntityPtr>({
+                std::make_shared<TEntity>(TEntity{
+                    {"key#1", "value#11"},
+                }),
+                std::make_shared<TEntity>(TEntity{
+                    {"key#1", "value#11"},
+                    {"key#2", "value#22"},
+                    {"key#3", "value#33"},
+                }),
+                std::make_shared<TEntity>(TEntity{
+                    {"key#1", "value#11"},
+                    {"key#2", "value#23"},
+                    {"key#3", "value#33"},
+                }),
+            }));
+        UNIT_ASSERT_VALUES_EQUAL(
+            ent.GetEntitiesWithAttrs({{"key#111", "value#11"}}),
+            std::vector<TEntityPtr>());
+
+        // valid calls
+        {
+            std::array<const std::pair<TStringBuf, TString>, 2> arr = {{
+                {"key#1", "value#11"},
+                {"key#3", "value#33"},
+            }};
+            auto vec = ent.GetEntitiesWithSortedUniqueAttrs<TStringBuf>({arr.begin(), arr.end()});
+            UNIT_ASSERT_VALUES_EQUAL(
+                vec,
+                std::vector<TEntityPtr>({
+                    std::make_shared<TEntity>(TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#22"},
+                        {"key#3", "value#33"},
+                    }),
+                    std::make_shared<TEntity>(TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#23"},
+                        {"key#3", "value#33"},
+                    }),
+                }));
+        }
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#111", "value#13"},
+                {"key#3", "value#33"},
+            }};
+            UNIT_ASSERT_VALUES_EQUAL(
+                ent.GetEntitiesWithSortedUniqueAttrs({arr.begin(), arr.end()}),
+                std::vector<TEntityPtr>());
+        }
+
+        // invalid calls
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#3", "value#33"},
+                {"key#1", "value#13"},
+            }};
+            UNIT_ASSERT_EXCEPTION_CONTAINS(
+                ent.GetEntitiesWithSortedUniqueAttrs({arr.begin(), arr.end()}),
+                TIllegalUsage,
+                "attrs are not sorted: 'key#3' before 'key#1'");
+        }
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#1", "value#13"},
+                {"key#1", "value#13"},
+            }};
+            UNIT_ASSERT_EXCEPTION_CONTAINS(
+                ent.GetEntitiesWithSortedUniqueAttrs({arr.begin(), arr.end()}),
+                TIllegalUsage,
+                "attrs are not unique: 'key#1'");
+        }
+    }
+
+    Y_UNIT_TEST(Consumer) {
+        TConsumerRoles c({
+            {"read", std::make_shared<TEntities>(CreateEntitiesIndex())},
+            {"write", std::make_shared<TEntities>(CreateEntitiesIndex())},
+        });
+
+        UNIT_ASSERT_EQUAL(c.GetRoles().size(), 2);
+        UNIT_ASSERT(c.HasRole("read"));
+        UNIT_ASSERT(c.HasRole("write"));
+        UNIT_ASSERT(!c.HasRole("access"));
+
+        UNIT_ASSERT_EQUAL(nullptr, c.GetEntitiesForRole("access"));
+
+        TEntitiesPtr ent = c.GetEntitiesForRole("read");
+        UNIT_ASSERT_UNEQUAL(nullptr, ent);
+        UNIT_ASSERT(ent->Contains({{"key#1", "value#11"}}));
+        UNIT_ASSERT(!ent->Contains({{"key#111", "value#11"}}));
+
+        UNIT_ASSERT(c.CheckRoleForExactEntity("read", {{"key#1", "value#11"}}));
+        UNIT_ASSERT(!c.CheckRoleForExactEntity("access", {{"key#1", "value#11"}}));
+        UNIT_ASSERT(!c.CheckRoleForExactEntity("read", {{"key#111", "value#11"}}));
+        UNIT_ASSERT(!c.CheckRoleForExactEntity("read", {}));
+    }
+
+    Y_UNIT_TEST(RolesService) {
+        TRoles r(
+            {},
+            {
+                {100500, std::make_shared<TConsumerRoles>(TEntitiesByRoles{
+                             {"write", std::make_shared<TEntities>(CreateEntitiesIndex())},
+                         })},
+            },
+            {},
+            std::make_shared<TString>());
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            r.GetRolesForService(NUnittest::CreateServiceTicket(
+                ETicketStatus::InvalidDst,
+                100500)),
+            TIllegalUsage,
+            "Service ticket must be valid, got: InvalidDst");
+
+        TConsumerRolesPtr cons;
+        UNIT_ASSERT_NO_EXCEPTION(
+            cons = r.GetRolesForService(NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100501)));
+        UNIT_ASSERT_EQUAL(nullptr, cons);
+
+        cons = r.GetRolesForService(NUnittest::CreateServiceTicket(
+            ETicketStatus::Ok,
+            100500));
+        UNIT_ASSERT_UNEQUAL(nullptr, cons);
+        UNIT_ASSERT_EQUAL(cons->GetRoles().size(), 1);
+        UNIT_ASSERT(!cons->HasRole("read"));
+        UNIT_ASSERT(cons->HasRole("write"));
+
+        ////shortcuts
+        // no tvmid
+        UNIT_ASSERT(!r.CheckServiceRole(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100501),
+            "write"));
+
+        // no role
+        UNIT_ASSERT(!r.CheckServiceRole(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100500),
+            "read"));
+
+        // success
+        UNIT_ASSERT(r.CheckServiceRole(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100500),
+            "write"));
+
+        // no tvmid
+        UNIT_ASSERT(!r.CheckServiceRoleForExactEntity(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100501),
+            "write",
+            {{"key#1", "value#11"}}));
+
+        // no role
+        UNIT_ASSERT(!r.CheckServiceRoleForExactEntity(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100500),
+            "read",
+            {{"key#1", "value#11"}}));
+
+        // no entity
+        UNIT_ASSERT(!r.CheckServiceRoleForExactEntity(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100500),
+            "write",
+            {{"key#111", "value#11"}}));
+
+        // success
+        UNIT_ASSERT(r.CheckServiceRoleForExactEntity(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100500),
+            "write",
+            {{"key#1", "value#11"}}));
+    }
+
+    Y_UNIT_TEST(RolesUser) {
+        TRoles r(
+            {},
+            {},
+            {
+                {789654, std::make_shared<TConsumerRoles>(TEntitiesByRoles{
+                             {"read", std::make_shared<TEntities>(CreateEntitiesIndex())},
+                         })},
+            },
+            std::make_shared<TString>("some roles"));
+
+        UNIT_ASSERT_VALUES_EQUAL("some roles", r.GetRaw());
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            r.GetRolesForUser(NUnittest::CreateUserTicket(
+                ETicketStatus::Malformed,
+                789654,
+                {})),
+            TIllegalUsage,
+            "User ticket must be valid, got: Malformed");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            r.GetRolesForUser(NUnittest::CreateUserTicket(
+                                  ETicketStatus::Ok,
+                                  789654,
+                                  {}),
+                              789123),
+            TIllegalUsage,
+            "User ticket must be from ProdYateam, got from Test");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            r.GetRolesForUser(NUnittest::CreateUserTicket(
+                                  ETicketStatus::Ok,
+                                  789654,
+                                  {},
+                                  {},
+                                  EBlackboxEnv::ProdYateam),
+                              789123),
+            TIllegalUsage,
+            "selectedUid must be in user ticket but it's not: 789123");
+
+        TConsumerRolesPtr cons;
+        UNIT_ASSERT_NO_EXCEPTION(
+            cons = r.GetRolesForUser(NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789123,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam)));
+        UNIT_ASSERT_EQUAL(nullptr, cons);
+
+        cons = r.GetRolesForUser(NUnittest::CreateUserTicket(
+            ETicketStatus::Ok,
+            789654,
+            {},
+            {},
+            EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT_UNEQUAL(nullptr, cons);
+        UNIT_ASSERT_EQUAL(cons->GetRoles().size(), 1);
+        UNIT_ASSERT(cons->HasRole("read"));
+        UNIT_ASSERT(!cons->HasRole("write"));
+
+        cons = r.GetRolesForUser(NUnittest::CreateUserTicket(
+                                     ETicketStatus::Ok,
+                                     789123,
+                                     {},
+                                     {789654, 789741},
+                                     EBlackboxEnv::ProdYateam),
+                                 789654);
+        UNIT_ASSERT_UNEQUAL(nullptr, cons);
+        UNIT_ASSERT_EQUAL(cons->GetRoles().size(), 1);
+        UNIT_ASSERT(cons->HasRole("read"));
+        UNIT_ASSERT(!cons->HasRole("write"));
+
+        ////shortcuts
+        // no uid
+        UNIT_ASSERT(!r.CheckUserRole(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789123,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "read"));
+
+        // no role
+        UNIT_ASSERT(!r.CheckUserRole(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789654,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "wrire"));
+
+        // success
+        UNIT_ASSERT(r.CheckUserRole(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789654,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "read"));
+
+        // no uid
+        UNIT_ASSERT(!r.CheckUserRoleForExactEntity(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789123,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "read",
+            {{"key#1", "value#11"}}));
+
+        // no role
+        UNIT_ASSERT(!r.CheckUserRoleForExactEntity(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789654,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "wrire",
+            {{"key#1", "value#11"}}));
+
+        // no entity
+        UNIT_ASSERT(!r.CheckUserRoleForExactEntity(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789654,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "read",
+            {{"key#111", "value#11"}}));
+
+        // success
+        UNIT_ASSERT(r.CheckUserRoleForExactEntity(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789654,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "read",
+            {{"key#1", "value#11"}}));
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/tvmapi_roles_fetcher_ut.cpp b/library/cpp/tvmauth/client/ut/roles/tvmapi_roles_fetcher_ut.cpp
new file mode 100644
index 0000000000..7eaf611e82
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/tvmapi_roles_fetcher_ut.cpp
@@ -0,0 +1,197 @@
+#include <library/cpp/tvmauth/client/ut/common.h>
+
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+#include <library/cpp/tvmauth/client/misc/api/roles_fetcher.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/stream/file.h>
+#include <util/system/fs.h>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NTvmApi;
+
+Y_UNIT_TEST_SUITE(TvmApiRolesFetcher) {
+    static const TString ROLES = R"({"revision": "100501", "born_date": 42})";
+
+    static const TString CACHE_DIR = "./tmp/";
+
+    static void CleanCache() {
+        NFs::RemoveRecursive(CACHE_DIR);
+        NFs::MakeDirectoryRecursive(CACHE_DIR);
+    }
+
+    Y_UNIT_TEST(ReadFromDisk) {
+        CleanCache();
+        auto logger = MakeIntrusive<TLogger>();
+
+        TRolesFetcherSettings s;
+        s.CacheDir = CACHE_DIR;
+        s.SelfTvmId = 111111;
+        s.IdmSystemSlug = "fem\tida";
+        TRolesFetcher fetcher(s, logger);
+
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), fetcher.ReadFromDisk());
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: File './tmp/roles' does not exist\n",
+            logger->Stream.Str());
+        logger->Stream.clear();
+
+        const TInstant now = TInstant::Seconds(TInstant::Now().Seconds());
+
+        TDiskWriter wr(CACHE_DIR + "roles");
+        UNIT_ASSERT(wr.Write("kek", now));
+        UNIT_ASSERT_NO_EXCEPTION(fetcher.ReadFromDisk());
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/roles' was successfully read\n"
+                << "4: Roles in disk cache are for another slug (kek). Self=fem\tida\n",
+            logger->Stream.Str());
+        logger->Stream.clear();
+
+        UNIT_ASSERT(wr.Write(TRolesFetcher::PrepareDiskFormat(ROLES, "femida_test"), now));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), fetcher.ReadFromDisk());
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/roles' was successfully read\n"
+                   "4: Roles in disk cache are for another slug (femida_test). Self=fem\tida\n",
+            logger->Stream.Str());
+        logger->Stream.clear();
+
+        UNIT_ASSERT(wr.Write(TRolesFetcher::PrepareDiskFormat(ROLES, "fem\tida"), now));
+        UNIT_ASSERT_VALUES_EQUAL(now, fetcher.ReadFromDisk());
+        UNIT_ASSERT(fetcher.AreRolesOk());
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/roles' was successfully read\n"
+                   "7: Succeed to read roles with revision 100501 from ./tmp/roles\n",
+            logger->Stream.Str());
+        logger->Stream.clear();
+    }
+
+    Y_UNIT_TEST(IsTimeToUpdate) {
+        TRetrySettings settings;
+        settings.RolesUpdatePeriod = TDuration::Minutes(123);
+
+        UNIT_ASSERT(!TRolesFetcher::IsTimeToUpdate(settings, TDuration::Seconds(5)));
+        UNIT_ASSERT(TRolesFetcher::IsTimeToUpdate(settings, TDuration::Hours(5)));
+    }
+
+    Y_UNIT_TEST(ShouldWarn) {
+        TRetrySettings settings;
+        settings.RolesWarnPeriod = TDuration::Minutes(123);
+
+        UNIT_ASSERT(!TRolesFetcher::ShouldWarn(settings, TDuration::Seconds(5)));
+        UNIT_ASSERT(TRolesFetcher::ShouldWarn(settings, TDuration::Hours(5)));
+    }
+
+    Y_UNIT_TEST(Update) {
+        CleanCache();
+        auto logger = MakeIntrusive<TLogger>();
+
+        TRolesFetcherSettings s;
+        s.CacheDir = CACHE_DIR;
+        s.SelfTvmId = 111111;
+        TRolesFetcher fetcher(s, logger);
+
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+
+        NUtils::TFetchResult fetchResult;
+        fetchResult.Code = 304;
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            fetcher.Update(NUtils::TFetchResult(fetchResult)),
+            yexception,
+            "tirole did not return any roles because current roles are actual, but there are no roles in memory");
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+        UNIT_ASSERT(!NFs::Exists(CACHE_DIR + "roles"));
+
+        fetchResult.Code = 206;
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            fetcher.Update(NUtils::TFetchResult(fetchResult)),
+            yexception,
+            "Unexpected code from tirole: 206.");
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+        UNIT_ASSERT(!NFs::Exists(CACHE_DIR + "roles"));
+
+        fetchResult.Code = 200;
+        fetchResult.Response = "kek";
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            fetcher.Update(NUtils::TFetchResult(fetchResult)),
+            yexception,
+            "Invalid json. 'kek'");
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+        UNIT_ASSERT(!NFs::Exists(CACHE_DIR + "roles"));
+
+        fetchResult.Response = ROLES;
+        UNIT_ASSERT_NO_EXCEPTION(fetcher.Update(NUtils::TFetchResult(fetchResult)));
+        UNIT_ASSERT(fetcher.AreRolesOk());
+        UNIT_ASSERT(NFs::Exists(CACHE_DIR + "roles"));
+        {
+            TFileInput f(CACHE_DIR + "roles");
+            TString body = f.ReadAll();
+            UNIT_ASSERT_C(body.Contains(ROLES), "got body: '" << body << "'");
+        }
+
+        fetchResult.Code = 304;
+        fetchResult.Response.clear();
+        UNIT_ASSERT_NO_EXCEPTION(fetcher.Update(NUtils::TFetchResult(fetchResult)));
+        UNIT_ASSERT(fetcher.AreRolesOk());
+        UNIT_ASSERT(NFs::Exists(CACHE_DIR + "roles"));
+
+        fetchResult.Code = 200;
+        fetchResult.Headers.AddHeader("X-Tirole-Compression", "kek");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            fetcher.Update(NUtils::TFetchResult(fetchResult)),
+            yexception,
+            "unknown codec format version; known: 1; got: kek");
+    }
+
+    Y_UNIT_TEST(CreateTiroleRequest) {
+        CleanCache();
+        auto logger = MakeIntrusive<TLogger>();
+
+        TRolesFetcherSettings s;
+        s.CacheDir = CACHE_DIR;
+        s.SelfTvmId = 111111;
+        s.IdmSystemSlug = "some sys";
+        TRolesFetcher fetcher(s, logger);
+
+        TRolesFetcher::TRequest req = fetcher.CreateTiroleRequest("some_ticket");
+        UNIT_ASSERT_VALUES_EQUAL(
+            "/v1/get_actual_roles?system_slug=some+sys&_pid=&lib_version=client_",
+            TStringBuf(req.Url).Chop(5));
+        UNIT_ASSERT_VALUES_EQUAL(
+            TKeepAliveHttpClient::THeaders({
+                {"X-Ya-Service-Ticket", "some_ticket"},
+            }),
+            req.Headers);
+
+        TDiskWriter wr(CACHE_DIR + "roles");
+        UNIT_ASSERT(wr.Write(TRolesFetcher::PrepareDiskFormat(
+            R"({"revision": "asd&qwe", "born_date": 42})",
+            "some sys")));
+        UNIT_ASSERT_NO_EXCEPTION(fetcher.ReadFromDisk());
+
+        req = fetcher.CreateTiroleRequest("some_ticket");
+        UNIT_ASSERT_VALUES_EQUAL(
+            "/v1/get_actual_roles?system_slug=some+sys&_pid=&lib_version=client_",
+            TStringBuf(req.Url).Chop(5));
+        UNIT_ASSERT_VALUES_EQUAL(
+            TKeepAliveHttpClient::THeaders({
+                {"If-None-Match", R"("asd&qwe")"},
+                {"X-Ya-Service-Ticket", "some_ticket"},
+            }),
+            req.Headers);
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/tvmtool_roles_fetcher_ut.cpp b/library/cpp/tvmauth/client/ut/roles/tvmtool_roles_fetcher_ut.cpp
new file mode 100644
index 0000000000..55db4950ce
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/tvmtool_roles_fetcher_ut.cpp
@@ -0,0 +1,103 @@
+#include <library/cpp/tvmauth/client/ut/common.h>
+
+#include <library/cpp/tvmauth/client/misc/tool/roles_fetcher.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NTvmTool;
+
+Y_UNIT_TEST_SUITE(TvmToolRolesFetcher) {
+    static const TString ROLES = R"({"revision": "100501", "born_date": 42})";
+
+    Y_UNIT_TEST(IsTimeToUpdate) {
+        TRolesFetcher rf(
+            TRolesFetcherSettings{.UpdatePeriod = TDuration::Minutes(1)},
+            new TLogger);
+
+        UNIT_ASSERT(!rf.IsTimeToUpdate(TDuration::Seconds(3)));
+        UNIT_ASSERT(!rf.IsTimeToUpdate(TDuration::Seconds(60)));
+        UNIT_ASSERT(rf.IsTimeToUpdate(TDuration::Seconds(61)));
+        UNIT_ASSERT(rf.IsTimeToUpdate(TDuration::Seconds(600)));
+    }
+
+    Y_UNIT_TEST(ShouldWarn) {
+        TRolesFetcher rf(
+            TRolesFetcherSettings{.WarnPeriod = TDuration::Minutes(20)},
+            new TLogger);
+
+        UNIT_ASSERT(!rf.ShouldWarn(TDuration::Minutes(3)));
+        UNIT_ASSERT(!rf.ShouldWarn(TDuration::Minutes(20)));
+        UNIT_ASSERT(rf.ShouldWarn(TDuration::Minutes(21)));
+        UNIT_ASSERT(rf.ShouldWarn(TDuration::Minutes(600)));
+    }
+
+    Y_UNIT_TEST(Common) {
+        auto logger = MakeIntrusive<TLogger>();
+        TRolesFetcher rf(
+            TRolesFetcherSettings{.SelfAlias = "some_alias"},
+            logger);
+        UNIT_ASSERT(!rf.AreRolesOk());
+        UNIT_ASSERT(!rf.GetCurrentRoles());
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            rf.Update(NUtils::TFetchResult{.Code = HTTP_NOT_MODIFIED}),
+            yexception,
+            "tvmtool did not return any roles because current roles are actual, but there are no roles in memory - this should never happen");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            rf.Update(NUtils::TFetchResult{.Code = HTTP_BAD_REQUEST, .Response = "kek"}),
+            yexception,
+            "Unexpected code from tvmtool: 400. kek");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            rf.Update(NUtils::TFetchResult{.Code = HTTP_OK, .Response = "kek"}),
+            yexception,
+            "Invalid json. 'kek'");
+
+        UNIT_ASSERT_NO_EXCEPTION(rf.Update(NUtils::TFetchResult{.Code = HTTP_OK, .Response = ROLES}));
+        UNIT_ASSERT(rf.AreRolesOk());
+        UNIT_ASSERT(rf.GetCurrentRoles());
+        UNIT_ASSERT_VALUES_EQUAL("100501", rf.GetCurrentRoles()->GetMeta().Revision);
+
+        UNIT_ASSERT_NO_EXCEPTION(rf.Update(NUtils::TFetchResult{.Code = HTTP_NOT_MODIFIED}));
+        UNIT_ASSERT_VALUES_EQUAL("100501", rf.GetCurrentRoles()->GetMeta().Revision);
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "7: Succeed to update roles with revision 100501\n",
+            logger->Stream.Str());
+    }
+
+    Y_UNIT_TEST(CreateRequest) {
+        struct TTestFetcher: TRolesFetcher {
+            using TRolesFetcher::CreateRequest;
+            using TRolesFetcher::TRequest;
+            using TRolesFetcher::TRolesFetcher;
+        };
+
+        TTestFetcher rf(
+            TRolesFetcherSettings{.SelfAlias = "some_&alias"},
+            new TLogger);
+
+        TTestFetcher::TRequest request = rf.CreateRequest({{"some_header", "some_value"}});
+        UNIT_ASSERT_VALUES_EQUAL(
+            "/v2/roles?self=some_%26alias",
+            request.Url);
+        UNIT_ASSERT_VALUES_EQUAL(
+            TKeepAliveHttpClient::THeaders({{"some_header", "some_value"}}),
+            request.Headers);
+
+        UNIT_ASSERT_NO_EXCEPTION(rf.Update(NUtils::TFetchResult{.Code = HTTP_OK, .Response = ROLES}));
+
+        request = rf.CreateRequest({{"some_header", "some_value"}});
+        UNIT_ASSERT_VALUES_EQUAL(
+            "/v2/roles?self=some_%26alias",
+            request.Url);
+        UNIT_ASSERT_VALUES_EQUAL(
+            TKeepAliveHttpClient::THeaders({
+                {"some_header", "some_value"},
+                {"If-None-Match", R"("100501")"},
+            }),
+            request.Headers);
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/settings_ut.cpp b/library/cpp/tvmauth/client/ut/settings_ut.cpp
new file mode 100644
index 0000000000..726beaf928
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/settings_ut.cpp
@@ -0,0 +1,158 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/misc/api/settings.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientSettings) {
+#if !defined(_win_)
+    Y_UNIT_TEST(CheckValid) {
+        struct TTestCase {
+            TString Name;
+            NTvmApi::TClientSettings Settings;
+            TString Err;
+        };
+        std::vector<TTestCase> cases = {
+            TTestCase{
+                .Name = "default",
+                .Settings = {},
+                .Err = "Invalid settings: nothing to do",
+            },
+            TTestCase{
+                .Name = "only secret",
+                .Settings = {
+                    .Secret = TStringBuf("foobar"),
+                },
+                .Err = "Secret is present but destinations list is empty. It makes no sense",
+            },
+            TTestCase{
+                .Name = "only dsts",
+                .Settings = {
+                    .FetchServiceTicketsForDsts = {42},
+                },
+                .Err = "SelfTvmId cannot be 0 if fetching of Service Tickets required",
+            },
+            TTestCase{
+                .Name = "dsts with selfTvmId",
+                .Settings = {
+                    .SelfTvmId = 43,
+                    .FetchServiceTicketsForDsts = {42},
+                },
+                .Err = "Secret is required for fetching of Service Tickets",
+            },
+            TTestCase{
+                .Name = "correct service tickets fetching",
+                .Settings = {
+                    .SelfTvmId = 43,
+                    .Secret = TStringBuf("foobar"),
+                    .FetchServiceTicketsForDsts = {42},
+                },
+                .Err = "",
+            },
+            TTestCase{
+                .Name = "only check srv flag",
+                .Settings = {
+                    .CheckServiceTickets = true,
+                },
+                .Err = "SelfTvmId cannot be 0 if checking of Service Tickets required",
+            },
+            TTestCase{
+                .Name = "tirole without disk cache",
+                .Settings = {
+                    .SelfTvmId = 43,
+                    .Secret = TStringBuf("foobar"),
+                    .FetchRolesForIdmSystemSlug = "kek",
+                },
+                .Err = "Disk cache must be enabled to use roles: they can be heavy",
+            },
+        };
+
+        for (const TTestCase& c : cases) {
+            if (c.Err) {
+                UNIT_ASSERT_EXCEPTION_CONTAINS_C(
+                    c.Settings.CheckValid(),
+                    TBrokenTvmClientSettings,
+                    c.Err,
+                    c.Name);
+            } else {
+                UNIT_ASSERT_NO_EXCEPTION_C(c.Settings.CheckValid(), c.Name);
+            }
+        }
+
+        NTvmApi::TClientSettings s{.DiskCacheDir = "/impossible/dir"};
+        UNIT_ASSERT_EXCEPTION(s.CheckValid(), TPermissionDenied);
+    }
+
+    Y_UNIT_TEST(CloneNormalized) {
+        NTvmApi::TClientSettings original;
+        original.FetchServiceTicketsForDsts = {43};
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(original.CloneNormalized(),
+                                       TBrokenTvmClientSettings,
+                                       "SelfTvmId cannot be 0 if fetching of Service Tickets required");
+        original.SelfTvmId = 15;
+        original.Secret = "bar";
+        original.DiskCacheDir = "./";
+
+        NTvmApi::TClientSettings::TDstVector expected = {43};
+        UNIT_ASSERT_VALUES_EQUAL(expected, original.CloneNormalized().FetchServiceTicketsForDsts);
+
+        original.FetchServiceTicketsForDstsWithAliases = {{"foo", 42}};
+        expected = {42, 43};
+        UNIT_ASSERT_VALUES_EQUAL(expected, original.CloneNormalized().FetchServiceTicketsForDsts);
+
+        original.FetchRolesForIdmSystemSlug = "kek";
+        expected = {42, 43, 2028120};
+        UNIT_ASSERT_VALUES_EQUAL(expected, original.CloneNormalized().FetchServiceTicketsForDsts);
+
+        original.FetchServiceTicketsForDsts.push_back(2028120);
+        expected = {42, 43, 2028120};
+        UNIT_ASSERT_VALUES_EQUAL(expected, original.CloneNormalized().FetchServiceTicketsForDsts);
+    }
+
+    Y_UNIT_TEST(NeedServiceTicketsFetching) {
+        NTvmApi::TClientSettings s;
+
+        UNIT_ASSERT(!s.NeedServiceTicketsFetching());
+
+        s.FetchServiceTicketsForDsts = {42};
+        UNIT_ASSERT(s.NeedServiceTicketsFetching());
+        s.FetchServiceTicketsForDsts.clear();
+
+        s.FetchServiceTicketsForDstsWithAliases = {{"foo", 42}};
+        UNIT_ASSERT(s.NeedServiceTicketsFetching());
+        s.FetchServiceTicketsForDstsWithAliases.clear();
+
+        s.FetchRolesForIdmSystemSlug = "bar";
+        UNIT_ASSERT(s.NeedServiceTicketsFetching());
+        s.FetchRolesForIdmSystemSlug.clear();
+    }
+
+    Y_UNIT_TEST(permitions) {
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TClientSettings::CheckPermissions("/qwerty"), TPermissionDenied);
+
+        const TString tmpDir = "./cache_dir";
+
+        NFs::RemoveRecursive(tmpDir);
+        NFs::MakeDirectory(tmpDir, NFs::FP_OWNER_WRITE | NFs::FP_GROUP_WRITE | NFs::FP_ALL_WRITE);
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TClientSettings::CheckPermissions(tmpDir), TPermissionDenied);
+
+        NFs::RemoveRecursive(tmpDir);
+        NFs::MakeDirectory(tmpDir, NFs::FP_OWNER_READ | NFs::FP_GROUP_READ | NFs::FP_ALL_READ);
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TClientSettings::CheckPermissions(tmpDir), TPermissionDenied);
+
+        NFs::RemoveRecursive(tmpDir);
+        NFs::MakeDirectory(tmpDir, NFs::FP_COMMON_FILE);
+        UNIT_ASSERT_NO_EXCEPTION(NTvmApi::TClientSettings::CheckPermissions(tmpDir));
+    }
+#endif
+
+    Y_UNIT_TEST(Dst) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NTvmApi::TClientSettings::TDst(0), yexception, "TvmId cannot be 0");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NTvmApi::TClientSettings::TDstMap({{"blackbox", 0}}),
+                                       TBrokenTvmClientSettings,
+                                       "TvmId cannot be 0");
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/src_checker_ut.cpp b/library/cpp/tvmauth/client/ut/src_checker_ut.cpp
new file mode 100644
index 0000000000..e3a4e3888a
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/src_checker_ut.cpp
@@ -0,0 +1,41 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/mocked_updater.h>
+#include <library/cpp/tvmauth/client/misc/src_checker.h>
+#include <library/cpp/tvmauth/client/misc/api/threaded_updater.h>
+
+#include <library/cpp/tvmauth/type.h>
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(SrcChecker) {
+    Y_UNIT_TEST(Check) {
+        NRoles::TRolesPtr roles = std::make_shared<NRoles::TRoles>(
+            NRoles::TRoles::TMeta{},
+            NRoles::TRoles::TTvmConsumers{
+                {12345, std::make_shared<NRoles::TConsumerRoles>(
+                            THashMap<TString, NRoles::TEntitiesPtr>())},
+            },
+            NRoles::TRoles::TUserConsumers{},
+            std::make_shared<TString>());
+
+        TAsyncUpdaterPtr u = new TMockedUpdater({.Roles = roles});
+        auto r = u->GetRoles();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TSrcChecker::Check(NUnittest::CreateServiceTicket(ETicketStatus::Expired, 12345), r),
+            TIllegalUsage,
+            "Service ticket must be valid");
+
+        TCheckedServiceTicket ticket;
+        UNIT_ASSERT_NO_EXCEPTION(
+            ticket = TSrcChecker::Check(NUnittest::CreateServiceTicket(ETicketStatus::Ok, 12345), r));
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, ticket.GetStatus());
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            ticket = TSrcChecker::Check(NUnittest::CreateServiceTicket(ETicketStatus::Ok, 9999), r));
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::NoRoles, ticket.GetStatus());
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/tvmapi_updater_ut.cpp b/library/cpp/tvmauth/client/ut/tvmapi_updater_ut.cpp
new file mode 100644
index 0000000000..ef1ebc8453
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/tvmapi_updater_ut.cpp
@@ -0,0 +1,1326 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/mocked_updater.h>
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+#include <library/cpp/tvmauth/client/misc/api/threaded_updater.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+#include <library/cpp/testing/unittest/tests_data.h>
+
+#include <util/stream/file.h>
+#include <util/string/subst.h>
+#include <util/system/fs.h>
+
+#include <regex>
+
+using namespace NTvmAuth;
+static const std::regex TIME_REGEX(R"(\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d.\d{6}Z)");
+
+Y_UNIT_TEST_SUITE(ApiUpdater) {
+    static const TString SRV_TICKET = "3:serv:CBAQ__________9_IgYIexCUkQY:GioCM49Ob6_f80y6FY0XBVN4hLXuMlFeyMvIMiDuQnZkbkLpRpQOuQo5YjWoBjM0Vf-XqOm8B7xtrvxSYHDD7Q4OatN2l-Iwg7i71lE3scUeD36x47st3nd0OThvtjrFx_D8mw_c0GT5KcniZlqq1SjhLyAk1b_zJsx8viRAhCU";
+    static const TString TEST_TICKET = "3:user:CA0Q__________9_Gg4KAgh7EHsg0oXYzAQoAQ:FSADps3wNGm92Vyb1E9IVq5M6ZygdGdt1vafWWEhfDDeCLoVA-sJesxMl2pGW4OxJ8J1r_MfpG3ZoBk8rLVMHUFrPa6HheTbeXFAWl8quEniauXvKQe4VyrpA1SPgtRoFqi5upSDIJzEAe1YRJjq1EClQ_slMt8R0kA_JjKUX54";
+    static const TString TVM_RESPONSE =
+        R"({
+            "19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+            "213" : { "ticket" : "service_ticket_2"},
+            "234" : { "error" : "Dst is not found" },
+            "185" : { "ticket" : "service_ticket_3"},
+            "deprecated" : { "ticket" : "deprecated_ticket" }
+        })";
+
+    static const TString CACHE_DIR = "./tmp/";
+
+    static void CleanCache() {
+        NFs::RemoveRecursive(CACHE_DIR);
+        NFs::MakeDirectoryRecursive(CACHE_DIR);
+    }
+
+    Y_UNIT_TEST(MockedUpdater) {
+        TMockedUpdater m;
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, m.GetStatus());
+        UNIT_ASSERT(m.GetCachedServiceContext()->Check(SRV_TICKET));
+        UNIT_ASSERT(m.GetCachedUserContext()->Check(TEST_TICKET));
+    }
+
+    Y_UNIT_TEST(Updater) {
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = GetCachePath(),
+            .SelfTvmId = 100500,
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus());
+        }
+
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully read") != TString::npos, l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().find("were successfully fetched") == TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(Updater_badConfig) {
+        NTvmApi::TClientSettings s;
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TThreadedUpdater::Create(s, TDevNullLogger::IAmBrave()), yexception);
+        s.SelfTvmId = 100500;
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TThreadedUpdater::Create(s, TDevNullLogger::IAmBrave()), yexception);
+        s.DiskCacheDir = GetCachePath();
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TThreadedUpdater::Create(s, TDevNullLogger::IAmBrave()), yexception);
+    }
+
+    class TOfflineUpdater: public NTvmApi::TThreadedUpdater {
+        bool Enabled_;
+        TString PublicKeys_;
+
+    public:
+        TOfflineUpdater(const NTvmApi::TClientSettings& settings,
+                        TIntrusivePtr<TLogger> l,
+                        bool enabled = false,
+                        TString keys = NUnittest::TVMKNIFE_PUBLIC_KEYS)
+            : NTvmApi::TThreadedUpdater(settings, l)
+            , Enabled_(enabled)
+            , PublicKeys_(keys)
+        {
+            Init();
+            StartWorker();
+        }
+
+        NUtils::TFetchResult FetchServiceTicketsFromHttp(const TString&) const override {
+            if (!Enabled_) {
+                throw yexception() << "alarm";
+            }
+            return {200, {}, "/2/ticket", TVM_RESPONSE, ""};
+        }
+
+        NUtils::TFetchResult FetchPublicKeysFromHttp() const override {
+            if (!Enabled_) {
+                throw yexception() << "alarm";
+            }
+            return {200, {}, "/2/keys", PublicKeys_, ""};
+        }
+    };
+
+    Y_UNIT_TEST(StartWithoutCache) {
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"kolmo", 213}},
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry:");
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n"
+                << "4: Failed to get ServiceTickets: alarm\n"
+                << "4: Failed to get ServiceTickets: alarm\n"
+                << "4: Failed to get ServiceTickets: alarm\n"
+                << "4: Failed to update service tickets: alarm\n"
+                << "3: Service tickets have not been refreshed for too long period\n",
+            l->Stream.Str());
+    }
+
+    static void WriteFile(TString name, TStringBuf body, TInstant time) {
+        NFs::Remove(CACHE_DIR + name);
+        TFileOutput f(CACHE_DIR + name);
+        f << TDiskWriter::PrepareData(time, body);
+    }
+
+    Y_UNIT_TEST(StartWithOldCache) {
+        CleanCache();
+        WriteFile("./public_keys",
+                  NUnittest::TVMKNIFE_PUBLIC_KEYS,
+                  TInstant::Now() - TDuration::Days(30)); // too old
+        WriteFile("./service_tickets",
+                  R"({"19":{"ticket":"3:serv:CBAQACIGCJSRBhAL:Fi"}})"
+                  "\t100500",
+                  TInstant::Now()); // too old
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"kolmo", 213}},
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+
+        UNIT_ASSERT_C(l->Stream.Str().find("Disk cache (public keys) is too old") != TString::npos, l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().find("Disk cache (service tickets) is too old") != TString::npos, l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().find("were successfully fetched") != TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithMissingCache) {
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = "../",
+            .SelfTvmId = 100500,
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry: ");
+
+        UNIT_ASSERT_C(l->Stream.Str().find("does not exist") != TString::npos, l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().find("were successfully fetched") == TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithBadCache_Tickets) {
+        CleanCache();
+        WriteFile("./service_tickets",
+                  TVM_RESPONSE,
+                  TInstant::Now());
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"kolmo", 213}},
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "4: Failed to read service tickets from disk: YYYYYYYYYYYYYYY\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"),
+                               std::regex(R"(Failed to read service tickets from disk: [^\n]+)"),
+                               "Failed to read service tickets from disk: YYYYYYYYYYYYYYY"));
+    }
+
+    Y_UNIT_TEST(StartWithBadCache_PublicKeys) {
+        CleanCache();
+        WriteFile("./public_keys",
+                  "ksjdafnlskdjzfgbhdl",
+                  TInstant::Now());
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry:");
+
+        UNIT_ASSERT_C(l->Stream.Str().find("4: Failed to read public keys from disk: Malformed TVM keys") != TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithCacheForAnotherTvmId) {
+        CleanCache();
+        WriteFile("./service_tickets",
+                  TVM_RESPONSE + "\t" + "100499",
+                  TInstant::Now());
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"kolmo", 213}},
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "4: Disk cache is for another tvmId (100499). Self=100500\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(StartWithCacheForAnotherDsts) {
+        CleanCache();
+        TInstant now = TInstant::Now();
+        WriteFile("./service_tickets",
+                  R"({"213" : { "ticket" : "3:serv:CBAQ__________9_IgYIlJEGEAs:T-"}})"
+                  "\t"
+                  "100500",
+                  now);
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"kolmo", 213}},
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            auto cache = u.GetCachedServiceTickets();
+            UNIT_ASSERT(cache->TicketsById.contains(213));
+            UNIT_ASSERT(cache->TicketsById.contains(19));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 1 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 1 destination(s)\n"
+                << "6: Cache was partly updated with 1 service ticket(s). total: 2\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+        l->Stream.Clear();
+
+        {
+            TOfflineUpdater u(s, l, true);
+            auto cache = u.GetCachedServiceTickets();
+            UNIT_ASSERT(cache->TicketsById.contains(213));
+            UNIT_ASSERT(cache->TicketsById.contains(19));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "4: tvm_id in cache is not integer: deprecated\n"
+                << "6: Got 3 service ticket(s) from disk\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(StartWithNotFreshCacheForAnotherDsts) {
+        CleanCache();
+        TInstant now = TInstant::Now();
+        WriteFile("./service_tickets",
+                  R"({"213" : { "ticket" : "3:serv:CBAQ__________9_IgYIlJEGEAs:T-"}})"
+                  "\t"
+                  "100500",
+                  now - TDuration::Hours(2));
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"kolmo", 213}},
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            auto cache = u.GetCachedServiceTickets();
+            UNIT_ASSERT(cache->TicketsById.contains(213));
+            UNIT_ASSERT(cache->TicketsById.contains(19));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+        l->Stream.Clear();
+
+        {
+            TOfflineUpdater u(s, l, true);
+            auto cache = u.GetCachedServiceTickets();
+            UNIT_ASSERT(cache->TicketsById.contains(213));
+            UNIT_ASSERT(cache->TicketsById.contains(19));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "4: tvm_id in cache is not integer: deprecated\n"
+                << "6: Got 3 service ticket(s) from disk\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(StartWithPartialDiskCache) {
+        CleanCache();
+        WriteFile("./public_keys",
+                  NUnittest::TVMKNIFE_PUBLIC_KEYS,
+                  TInstant::Now());
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"kolmo", 213}},
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: File './tmp/service_tickets' does not exist\n"
+                << "6: File './tmp/public_keys' was successfully read\n"
+                << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(StartFromHttpAndRestartFromDisk) {
+        CleanCache();
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Test,
+        };
+
+        {
+            auto l = MakeIntrusive<TLogger>();
+            {
+                TOfflineUpdater u(s, l, true);
+                UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+            }
+
+            UNIT_ASSERT_VALUES_EQUAL(
+                TStringBuilder()
+                    << "7: File './tmp/service_tickets' does not exist\n"
+                    << "7: File './tmp/public_keys' does not exist\n"
+                    << "7: File './tmp/retry_settings' does not exist\n"
+                    << "7: Response with service tickets for 1 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                    << "7: Got responses with service tickets with 1 pages for 1 destination(s)\n"
+                    << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n"
+                    << "6: File './tmp/service_tickets' was successfully written\n"
+                    << "7: Public keys were successfully fetched from https://tvm-api.yandex.net\n"
+                    << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                    << "6: File './tmp/public_keys' was successfully written\n"
+                    << "7: Thread-worker started\n"
+                    << "7: Thread-worker stopped\n",
+                std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+        }
+
+        {
+            auto l = MakeIntrusive<TLogger>();
+            {
+                TOfflineUpdater u(s, l, true);
+                UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+            }
+
+            UNIT_ASSERT_VALUES_EQUAL(
+                TStringBuilder()
+                    << "6: File './tmp/service_tickets' was successfully read\n"
+                    << "4: tvm_id in cache is not integer: deprecated\n"
+                    << "6: Got 3 service ticket(s) from disk\n"
+                    << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n"
+                    << "6: File './tmp/public_keys' was successfully read\n"
+                    << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                    << "7: File './tmp/retry_settings' does not exist\n"
+                    << "7: Thread-worker started\n"
+                    << "7: Thread-worker stopped\n",
+                std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+        }
+    }
+
+    class TUnstableUpdater: public NTvmApi::TThreadedUpdater {
+        mutable int V1_ = 0;
+        mutable int V2_ = 0;
+
+    public:
+        TUnstableUpdater(const NTvmApi::TClientSettings& settings, TIntrusivePtr<TLogger> l)
+            : NTvmApi::TThreadedUpdater(settings, l)
+        {
+            UNIT_ASSERT_NO_EXCEPTION_C(Init(), l->Stream.Str());
+            ExpBackoff_.SetEnabled(false);
+            StartWorker();
+
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Ok, GetStatus(), l->Stream.Str());
+
+            Sleep(TDuration::MicroSeconds(100));
+            PublicKeysDurations_.Expiring = TDuration::MicroSeconds(100);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus(TClientStatus::Warning, "Internal client error: failed to collect last useful error message, please report this message to tvm-dev@yandex-team.ru"),
+                                       GetStatus(),
+                                       l->Stream.Str());
+
+            PublicKeysDurations_.Invalid = TDuration::MicroSeconds(20);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Error, GetStatus(), l->Stream.Str());
+
+            PublicKeysDurations_.Expiring = TDuration::Seconds(100);
+            PublicKeysDurations_.Invalid = TDuration::Seconds(200);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Ok, GetStatus(), l->Stream.Str());
+
+            ServiceTicketsDurations_.Expiring = TDuration::MicroSeconds(100);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Warning, GetStatus(), l->Stream.Str());
+
+            ServiceTicketsDurations_.Invalid = TDuration::MicroSeconds(20);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Warning, GetStatus(), l->Stream.Str());
+
+            const TInstant* inv = &GetCachedServiceTickets()->InvalidationTime;
+            *const_cast<TInstant*>(inv) = TInstant::Now() + TDuration::Seconds(30);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Error, GetStatus(), l->Stream.Str());
+        }
+
+        NUtils::TFetchResult FetchServiceTicketsFromHttp(const TString&) const override {
+            Y_ENSURE_EX(++V1_ > 1, yexception() << "++v1_ > 1:" << V1_);
+            return {200, {}, "/2/ticket", TVM_RESPONSE, ""};
+        }
+
+        NUtils::TFetchResult FetchPublicKeysFromHttp() const override {
+            Y_ENSURE_EX(++V2_ > 2, yexception() << "++v2_ > 2:" << V2_);
+            return {200, {}, "/2/keys", NUnittest::TVMKNIFE_PUBLIC_KEYS, ""};
+        }
+    };
+
+    Y_UNIT_TEST(StartFromUnstableHttp) {
+        CleanCache();
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Test,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TUnstableUpdater u(s, l);
+        }
+
+        UNIT_ASSERT_C(l->Stream.Str().Contains("++v1_ > 1"), l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().Contains("++v2_ > 2"), l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().Contains("7: Response with service tickets for 1 destination(s) was successfully fetched from https://tvm-api.yandex.net"), l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().Contains("7: Public keys were successfully fetched"), l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(GetUpdateTimeOfServiceTickets) {
+        CleanCache();
+        TInstant ins = TInstant::Now();
+        WriteFile("./service_tickets",
+                  TVM_RESPONSE + "\t" + "100500",
+                  ins);
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        TOfflineUpdater u(s, l, true);
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), u.GetUpdateTimeOfPublicKeys());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(ins.Seconds()), u.GetUpdateTimeOfServiceTickets());
+    }
+
+    class TSignalingUpdater: public NTvmApi::TThreadedUpdater {
+        mutable int V_ = 0;
+        TAutoEvent& Ev_;
+        const TStringBuf PublicKeys_;
+
+    public:
+        TSignalingUpdater(const NTvmApi::TClientSettings& settings,
+                          TLoggerPtr l,
+                          TAutoEvent& ev,
+                          const TStringBuf keys = NUnittest::TVMKNIFE_PUBLIC_KEYS)
+            : NTvmApi::TThreadedUpdater(settings, l)
+            , Ev_(ev)
+            , PublicKeys_(keys)
+        {
+            WorkerAwakingPeriod_ = TDuration::MilliSeconds(300);
+            PublicKeysDurations_.RefreshPeriod = TDuration::MilliSeconds(700);
+            Init();
+            ExpBackoff_.SetEnabled(false);
+            StartWorker();
+        }
+
+        NUtils::TFetchResult FetchPublicKeysFromHttp() const override {
+            if (++V_ >= 2) {
+                Ev_.Signal();
+            }
+            return {200, {}, "/2/keys", TString(PublicKeys_), ""};
+        }
+    };
+
+    Y_UNIT_TEST(StartWorker) {
+        class TSignalingUpdater: public NTvmApi::TThreadedUpdater {
+            mutable int V_ = 0;
+            TAutoEvent& Ev_;
+
+        public:
+            TSignalingUpdater(const NTvmApi::TClientSettings& settings, TLoggerPtr l, TAutoEvent& ev)
+                : NTvmApi::TThreadedUpdater(settings, l)
+                , Ev_(ev)
+            {
+                WorkerAwakingPeriod_ = TDuration::MilliSeconds(300);
+                PublicKeysDurations_.RefreshPeriod = TDuration::MilliSeconds(700);
+                Init();
+                ExpBackoff_.SetEnabled(false);
+                StartWorker();
+            }
+
+            void Worker() override {
+                NTvmApi::TThreadedUpdater::Worker();
+                Ev_.Signal();
+            }
+
+            NUtils::TFetchResult FetchPublicKeysFromHttp() const override {
+                if (++V_ < 4) {
+                    return {500, {}, "/2/keys", "lol", ""};
+                }
+                return {200, {}, "/2/keys", NUnittest::TVMKNIFE_PUBLIC_KEYS, "CAEQChkAAAAAAAD4PyGamZmZmZm5PyhkMAE4B0BGSAI"};
+            }
+        };
+
+        CleanCache();
+        TInstant expiringPubKeys = TInstant::Now() - TDuration::Days(3);
+        WriteFile("./public_keys", NUnittest::TVMKNIFE_PUBLIC_KEYS, expiringPubKeys);
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        TAutoEvent ev;
+        {
+            TSignalingUpdater u(s, l, ev);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus(TClientStatus::Warning, "PublicKeys: Path:/2/keys.Code=500: lol"),
+                                     u.GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(expiringPubKeys.Seconds()), u.GetUpdateTimeOfPublicKeys());
+            UNIT_ASSERT_VALUES_EQUAL(TInstant(), u.GetUpdateTimeOfServiceTickets());
+
+            UNIT_ASSERT(ev.WaitT(TDuration::Seconds(15)));
+            Sleep(TDuration::MilliSeconds(500));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/public_keys' was successfully read\n"
+                << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "4: Failed to get PublicKeys: Path:/2/keys.Code=500: lol\n"
+                << "4: Failed to get PublicKeys: Path:/2/keys.Code=500: lol\n"
+                << "4: Failed to get PublicKeys: Path:/2/keys.Code=500: lol\n"
+                << "4: Failed to update public keys: Path:/2/keys.Code=500: lol\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "7: Thread-worker started\n"
+                << "7: Retry settings were updated: exponential_backoff_min:0.000000s->1.000000s;exponential_backoff_max:60.000000s->10.000000s;exponential_backoff_factor:2->1.5;exponential_backoff_jitter:0.5->0.1;max_random_sleep_default:5.000000s->0.100000s;retries_on_start:3->1;worker_awaking_period:10.000000s->7.000000s;dsts_limit:300->70;\n"
+                << "6: File './tmp/retry_settings' was successfully written\n"
+                << "7: Public keys were successfully fetched from https://tvm-api.yandex.net\n"
+                << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                << "6: File './tmp/public_keys' was successfully written\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+#if defined(_unix_)
+    Y_UNIT_TEST(StartFromCacheAndBadPublicKeysFromHttp) {
+        CleanCache();
+        TInstant now = TInstant::Now();
+        WriteFile("public_keys", NUnittest::TVMKNIFE_PUBLIC_KEYS, now - TDuration::Days(3)); // expiring public keys
+
+        NTvmApi::TClientSettings s{
+            .DiskCacheDir = CACHE_DIR,
+            .SelfTvmId = 100500,
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TAutoEvent ev;
+            TSignalingUpdater u(s, l, ev, "malformed keys");
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus(TClientStatus::Warning, "PublicKeys: Malformed TVM keys"),
+                                     u.GetStatus());
+
+            UNIT_ASSERT(ev.WaitT(TDuration::Seconds(15)));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, u.GetStatus());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/public_keys' was successfully read\n"
+                << "6: Cache was updated with public keys: " << TInstant::Seconds((now - TDuration::Days(3)).Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Public keys were successfully fetched from https://tvm-api.yandex.net\n"
+                << "4: Failed to update public keys: Malformed TVM keys\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "7: Thread-worker started\n"
+                << "7: Public keys were successfully fetched from https://tvm-api.yandex.net\n"
+                << "4: Failed to update public keys: Malformed TVM keys\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+    }
+#endif
+
+    Y_UNIT_TEST(StartWithBadPublicKeysFromHttp) {
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        TAutoEvent ev;
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l, true, "some public keys"),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry:");
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n"
+                << "7: Public keys were successfully fetched from https://tvm-api.yandex.net\n"
+                << "4: Failed to update public keys: Malformed TVM keys\n"
+                << "3: Public keys have not been refreshed for too long period\n",
+            l->Stream.Str());
+    }
+
+    class TNotInitedUpdater: public NTvmApi::TThreadedUpdater {
+    public:
+        TNotInitedUpdater(const NTvmApi::TClientSettings& settings, TLoggerPtr l = TDevNullLogger::IAmBrave())
+            : NTvmApi::TThreadedUpdater(settings, l)
+        {
+            this->ExpBackoff_.SetEnabled(false);
+        }
+
+        using NTvmApi::TThreadedUpdater::AppendToJsonArray;
+        using NTvmApi::TThreadedUpdater::AreServicesTicketsOk;
+        using NTvmApi::TThreadedUpdater::CreateJsonArray;
+        using NTvmApi::TThreadedUpdater::FindMissingDsts;
+        using NTvmApi::TThreadedUpdater::GetPublicKeysFromHttp;
+        using NTvmApi::TThreadedUpdater::GetServiceTicketsFromHttp;
+        using NTvmApi::TThreadedUpdater::Init;
+        using NTvmApi::TThreadedUpdater::IsServiceContextOk;
+        using NTvmApi::TThreadedUpdater::IsTimeToUpdatePublicKeys;
+        using NTvmApi::TThreadedUpdater::IsTimeToUpdateServiceTickets;
+        using NTvmApi::TThreadedUpdater::IsUserContextOk;
+        using NTvmApi::TThreadedUpdater::ParseTicketsFromDisk;
+        using NTvmApi::TThreadedUpdater::ParseTicketsFromResponse;
+        using NTvmApi::TThreadedUpdater::PrepareRequestForServiceTickets;
+        using NTvmApi::TThreadedUpdater::PrepareTicketsForDisk;
+        using NTvmApi::TThreadedUpdater::SetServiceContext;
+        using NTvmApi::TThreadedUpdater::SetServiceTickets;
+        using NTvmApi::TThreadedUpdater::SetUserContext;
+        using NTvmApi::TThreadedUpdater::THttpResult;
+        using NTvmApi::TThreadedUpdater::TPairTicketsErrors;
+        using TAsyncUpdaterBase::IsServiceTicketMapOk;
+    };
+
+    Y_UNIT_TEST(IsCacheComplete_Empty) {
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"blackbox2", 20}},
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Test,
+        };
+
+        TNotInitedUpdater u(s);
+        UNIT_ASSERT(!u.AreServicesTicketsOk());
+    }
+
+    Y_UNIT_TEST(IsCacheComplete_Tickets) {
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"blackbox2", 20}},
+        };
+
+        TNotInitedUpdater u(s);
+        UNIT_ASSERT(!u.AreServicesTicketsOk());
+
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            TServiceTickets::TMapIdStr({{1, "mega_ticket"}}),
+            TServiceTickets::TMapIdStr({{2, "mega_error"}}),
+            TServiceTickets::TMapAliasId()));
+        UNIT_ASSERT(!u.AreServicesTicketsOk());
+
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            TServiceTickets::TMapIdStr({
+                {1, "mega_ticket"},
+                {2, "mega_ticket2"},
+            }),
+            TServiceTickets::TMapIdStr({
+                {3, "mega_error3"},
+            }),
+            TServiceTickets::TMapAliasId()));
+        UNIT_ASSERT(u.AreServicesTicketsOk());
+    }
+
+    Y_UNIT_TEST(IsCacheComplete_Service) {
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .CheckServiceTickets = true,
+        };
+
+        TNotInitedUpdater u(s);
+        UNIT_ASSERT(!u.IsServiceContextOk());
+
+        u.SetServiceContext(MakeIntrusiveConst<TServiceContext>(
+            TServiceContext::CheckingFactory(100500, NUnittest::TVMKNIFE_PUBLIC_KEYS)));
+        UNIT_ASSERT(u.IsServiceContextOk());
+    }
+
+    Y_UNIT_TEST(IsCacheComplete_User) {
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Test,
+        };
+
+        TNotInitedUpdater u(s);
+        UNIT_ASSERT(!u.IsUserContextOk());
+
+        u.SetUserContext(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT(u.IsUserContextOk());
+    }
+
+    Y_UNIT_TEST(TicketsOnDisk) {
+        TString res = R"({
+            "19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+            "213" : { "ticket" : "service_ticket_2"},
+            "234" : { "error" : "Dst is not found" },
+            "185" : { "ticket" : "service_ticket_3"},
+            "deprecated" : { "ticket" : "deprecated_ticket" }
+        })";
+        res.append("\t100500");
+
+        UNIT_ASSERT_VALUES_EQUAL(res, TNotInitedUpdater::PrepareTicketsForDisk(TVM_RESPONSE, 100500));
+
+        auto pair = TNotInitedUpdater::ParseTicketsFromDisk(res);
+        UNIT_ASSERT_VALUES_EQUAL(pair.first, TVM_RESPONSE);
+        UNIT_ASSERT_VALUES_EQUAL(pair.second, 100500);
+
+        res.push_back('a');
+        UNIT_ASSERT_EXCEPTION(TNotInitedUpdater::ParseTicketsFromDisk(res), yexception);
+    }
+
+    Y_UNIT_TEST(IsTimeToUpdatePublicKeys) {
+        NTvmApi::TClientSettings s{
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Test,
+        };
+
+        TNotInitedUpdater u(s);
+
+        UNIT_ASSERT(!u.IsTimeToUpdatePublicKeys(TInstant::Now()));
+        UNIT_ASSERT(!u.IsTimeToUpdatePublicKeys(TInstant::Now() - TDuration::Hours(23)));
+        UNIT_ASSERT(u.IsTimeToUpdatePublicKeys(TInstant::Now() - TDuration::Days(1) - TDuration::MilliSeconds(1)));
+    }
+
+    Y_UNIT_TEST(IsTimeToUpdateServiceTickets) {
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"blackbox2", 20}},
+        };
+
+        TNotInitedUpdater u(s);
+
+        UNIT_ASSERT(!u.IsTimeToUpdateServiceTickets(TInstant::Now() - TDuration::Minutes(59)));
+        UNIT_ASSERT(u.IsTimeToUpdateServiceTickets(TInstant::Now() - TDuration::Hours(1) - TDuration::MilliSeconds(1)));
+    }
+
+    Y_UNIT_TEST(StartWithIncompliteCache) {
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}, {"blackbox2", 20}},
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Test,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l, true),
+                                       TNonRetriableException,
+                                       "Failed to get ServiceTicket for 20: Missing tvm_id in response, should never happend: 20");
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "3: Failed to get service ticket for dst=20: Missing tvm_id in response, should never happend: 20\n"
+                << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(PrepareRequestForServiceTickets) {
+        const TServiceContext ctx = TServiceContext::SigningFactory("AAAAAAAAAAAAAAAAAAAAAA");
+
+        TString s = TNotInitedUpdater::PrepareRequestForServiceTickets(117,
+                                                                       ctx,
+                                                                       {19, 20},
+                                                                       NUtils::TProcInfo{
+                                                                           "__some_pid__",
+                                                                           "__some_pname__",
+                                                                           "kar",
+                                                                       },
+                                                                       100700);
+        SubstGlobal(s.resize(s.size() - 5), "deb_", "");
+        UNIT_ASSERT_VALUES_EQUAL("grant_type=client_credentials&src=117&dst=19,20&ts=100700&sign=XTz2Obd6PII_BHxswzWPJTjju9SrKsN6hyu1VsyxBvU&get_retry_settings=yes&_pid=__some_pid__&_procces_name=__some_pname__&lib_version=client_kar",
+                                 s);
+
+        s = TNotInitedUpdater::PrepareRequestForServiceTickets(118,
+                                                               ctx,
+                                                               {19},
+                                                               NUtils::TProcInfo{
+                                                                   "__some_pid__",
+                                                                   {},
+                                                                   "kva_",
+                                                               },
+                                                               100900);
+        SubstGlobal(s.resize(s.size() - 5), "deb_", "");
+        UNIT_ASSERT_VALUES_EQUAL("grant_type=client_credentials&src=118&dst=19&ts=100900&sign=-trBo9AtBLjp2ihy6cFAdMAQ6S9afHj23rFzYQ32jkQ&get_retry_settings=yes&_pid=__some_pid__&lib_version=client_kva_",
+                                 s);
+    }
+
+    Y_UNIT_TEST(ParseTicketsFromResponse) {
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        TNotInitedUpdater u(s, l);
+
+        TNotInitedUpdater::TPairTicketsErrors t;
+        UNIT_ASSERT_EXCEPTION_CONTAINS(u.ParseTicketsFromResponse("{", NTvmApi::TDstSet{19}, t),
+                                       yexception,
+                                       "Invalid json from tvm-api");
+
+        t = {};
+        u.ParseTicketsFromResponse(TVM_RESPONSE, NTvmApi::TDstSet{19}, t);
+
+        TNotInitedUpdater::TPairTicketsErrors expected{{{19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}}, {}};
+        UNIT_ASSERT_VALUES_EQUAL("6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n",
+                                 l->Stream.Str());
+        UNIT_ASSERT_EQUAL(expected, t);
+
+        t = {};
+        u.ParseTicketsFromResponse(TVM_RESPONSE,
+                                   NTvmApi::TDstSet{19, 213, 234, 235},
+                                   t);
+        expected = {{{19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+                     {213, "service_ticket_2"}},
+                    {{234, "Dst is not found"},
+                     {235, "Missing tvm_id in response, should never happend: 235"}}};
+        UNIT_ASSERT_EQUAL(expected, t);
+        UNIT_ASSERT_VALUES_EQUAL("6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n",
+                                 l->Stream.Str());
+
+        t = {};
+        u.ParseTicketsFromResponse(
+            R"([
+                {"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},"234" : { "error" : "Dst is not found" }},
+                {"213" : { "ticket" : "service_ticket_2"},"185" : { "ticket" : "service_ticket_3"}},
+                {"deprecated" : { "ticket" : "deprecated_ticket" }}
+            ])",
+            NTvmApi::TDstSet{19, 213, 234, 235},
+            t);
+        expected = {{{19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+                     {213, "service_ticket_2"}},
+                    {{234, "Dst is not found"},
+                     {235, "Missing tvm_id in response, should never happend: 235"}}};
+        UNIT_ASSERT_EQUAL(expected, t);
+        UNIT_ASSERT_VALUES_EQUAL("6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n",
+                                 l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(ParseTicketsFromResponseAsArray) {
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .CheckServiceTickets = true,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        TNotInitedUpdater u(s, l);
+
+        TNotInitedUpdater::TPairTicketsErrors t;
+        UNIT_ASSERT_EXCEPTION_CONTAINS(u.ParseTicketsFromResponse("[", NTvmApi::TDstSet{19}, t),
+                                       yexception,
+                                       "Invalid json from tvm-api");
+
+        u.ParseTicketsFromResponse(R"([])", NTvmApi::TDstSet{19}, t);
+        UNIT_ASSERT_VALUES_EQUAL("6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n",
+                                 l->Stream.Str());
+        TNotInitedUpdater::TPairTicketsErrors expected = {
+            {}, {{19, "Missing tvm_id in response, should never happend: 19"}}};
+        UNIT_ASSERT_VALUES_EQUAL(expected, t);
+        l->Stream.Clear();
+
+        t = {};
+        u.ParseTicketsFromResponse(
+            R"([{},{"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}}, {"213" : { "ticket" : "service_ticket_2"}}])",
+            NTvmApi::TDstSet{19},
+            t);
+        UNIT_ASSERT_VALUES_EQUAL("", l->Stream.Str());
+        expected = {{{19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}}, {}};
+        UNIT_ASSERT_EQUAL(expected, t);
+
+        t = {};
+        u.ParseTicketsFromResponse(
+            R"([{
+                    "19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}
+                },
+                {
+                    "213" : { "ticket" : "service_ticket_2"},
+                    "234" : { "error" : "Dst is not found" }
+                },
+                {
+                    "185" : { "ticket" : "service_ticket_3"},
+                    "deprecated" : { "ticket" : "deprecated_ticket" }
+                }
+            ])",
+            NTvmApi::TDstSet{19, 213, 234, 235},
+            t);
+        expected = {{{19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+                     {213, "service_ticket_2"}},
+                    {{234, "Dst is not found"},
+                     {235, "Missing tvm_id in response, should never happend: 235"}}};
+        UNIT_ASSERT_EQUAL(expected, t);
+        UNIT_ASSERT_VALUES_EQUAL("", l->Stream.Str());
+    }
+
+    class TReplier: public TRequestReplier {
+    public:
+        HttpCodes Code = HTTP_OK;
+
+        bool DoReply(const TReplyParams& params) override {
+            TParsedHttpFull fl(params.Input.FirstLine());
+
+            THttpResponse resp(Code);
+            if (fl.Path == "/2/keys") {
+                resp.SetContent(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+            } else if (fl.Path == "/2/ticket") {
+                resp.SetContent(TVM_RESPONSE);
+            } else {
+                UNIT_ASSERT(false);
+            }
+            resp.OutTo(params.Output);
+
+            return true;
+        }
+    };
+
+    class TOnlineUpdater: public NTvmApi::TThreadedUpdater {
+    public:
+        TOnlineUpdater(const NTvmApi::TClientSettings& settings, TIntrusivePtr<TLogger> l)
+            : NTvmApi::TThreadedUpdater(settings, l)
+        {
+            Init();
+            ExpBackoff_.SetEnabled(false);
+            StartWorker();
+        }
+    };
+
+    Y_UNIT_TEST(MocServerOk) {
+        TPortManager pm;
+        ui16 tvmPort = pm.GetPort(80);
+        NMock::TMockServer server(tvmPort, []() { return new TReplier; });
+
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Test,
+            .TvmHost = "http://localhost",
+            .TvmPort = tvmPort,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOnlineUpdater u(s, l);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Ok, u.GetStatus(), l->Stream.Str());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n"
+                << "7: Response with service tickets for 1 destination(s) was successfully fetched from http://localhost\n"
+                << "7: Got responses with service tickets with 1 pages for 1 destination(s)\n"
+                << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n"
+                << "7: Public keys were successfully fetched from http://localhost\n"
+                << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(MocServerBad) {
+        TPortManager pm;
+        ui16 tvmPort = pm.GetPort(80);
+        NMock::TMockServer server(tvmPort,
+                                  []() {
+                                      auto p = new TReplier;
+                                      p->Code = HTTP_BAD_REQUEST;
+                                      return p;
+                                  });
+
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDstsWithAliases = {{"blackbox", 19}},
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Test,
+            .TvmHost = "http://localhost",
+            .TvmPort = tvmPort,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS_C(TOnlineUpdater(s, l),
+                                         TNonRetriableException,
+                                         "Failed to start TvmClient. Do not retry: ServiceTickets: Path:/2/ticket.Code=400:",
+                                         l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(MocServerPaginated) {
+        class TReplier: public TRequestReplier {
+        public:
+            TString Response;
+            TReplier(TString response)
+                : Response(response)
+            {
+            }
+
+            bool DoReply(const TReplyParams& params) override {
+                TParsedHttpFull fl(params.Input.FirstLine());
+                if (fl.Path != "/2/ticket") {
+                    UNIT_ASSERT_C(false, fl.Path);
+                }
+
+                THttpResponse resp(HTTP_OK);
+                resp.SetContent(Response);
+                resp.OutTo(params.Output);
+                return true;
+            }
+        };
+
+        TPortManager pm;
+        ui16 tvmPort = pm.GetPort(80);
+        TVector<TString> responses = {
+            R"({"15" : { "ticket" : "service_ticket_3" },"19" : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})",
+            R"({"222" : { "ticket" : "service_ticket_2"}, "239" : { "error" : "Dst is not found" }})",
+            R"({"185" : { "ticket" : "service_ticket_3"}})",
+        };
+        NMock::TMockServer server(tvmPort, [&responses]() {
+            if (responses.empty()) {
+                return new TReplier("<NULL>");
+            }
+            TString r = responses.front();
+            responses.erase(responses.begin());
+            return new TReplier(r);
+        });
+
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .Secret = (TStringBuf) "qwerty",
+            .FetchServiceTicketsForDsts = {19, 222, 239, 100500, 15},
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = EBlackboxEnv::Test,
+            .TvmHost = "http://localhost",
+            .TvmPort = tvmPort,
+        };
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TNotInitedUpdater u(s, l);
+            TNotInitedUpdater::THttpResult result = u.GetServiceTicketsFromHttp(NTvmApi::TDstSet{19, 222, 239, 100500, 15}, 2);
+            UNIT_ASSERT_VALUES_EQUAL(TSmallVec<TString>({
+                                         R"({"15" : { "ticket" : "service_ticket_3" },"19" : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})",
+                                         R"({"222" : { "ticket" : "service_ticket_2"}, "239" : { "error" : "Dst is not found" }})",
+                                         R"({"185" : { "ticket" : "service_ticket_3"}})",
+                                     }),
+                                     result.Responses);
+            TNotInitedUpdater::TPairTicketsErrors expected{
+                {
+                    {19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+                    {222, "service_ticket_2"},
+                    {15, "service_ticket_3"},
+                },
+                {
+                    {239, "Dst is not found"},
+                    {100500, "Missing tvm_id in response, should never happend: 100500"},
+                },
+            };
+            UNIT_ASSERT_VALUES_EQUAL(expected, result.TicketsWithErrors);
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from http://localhost\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from http://localhost\n"
+                << "7: Response with service tickets for 1 destination(s) was successfully fetched from http://localhost\n"
+                << "7: Got responses with service tickets with 3 pages for 5 destination(s)\n"
+                << "3: Failed to get service ticket for dst=100500: Missing tvm_id in response, should never happend: 100500\n"
+                << "3: Failed to get service ticket for dst=239: Dst is not found\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(FindMissingDsts) {
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector({6, 9}),
+                                 TNotInitedUpdater::FindMissingDsts({1, 2, 3, 4}, {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector(),
+                                 TNotInitedUpdater::FindMissingDsts({1, 2, 3, 4, 5, 6, 7, 8, 9}, {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector({1, 4, 6, 9}),
+                                 TNotInitedUpdater::FindMissingDsts(NTvmApi::TDstSet(), {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector(1, 19),
+                                 TNotInitedUpdater::FindMissingDsts({213}, {19, 213}));
+
+        auto make = [](TVector<int> ids) {
+            TServiceTickets::TMapIdStr m;
+            for (auto i : ids) {
+                m.insert({i, ""});
+            }
+            return MakeIntrusiveConst<TServiceTickets>(std::move(m), TServiceTickets::TMapIdStr{}, TServiceTickets::TMapAliasId{});
+        };
+
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector({6, 9}),
+                                 TNotInitedUpdater::FindMissingDsts(make({1, 2, 3, 4}), {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector(),
+                                 TNotInitedUpdater::FindMissingDsts(make({1, 2, 3, 4, 5, 6, 7, 8, 9}), {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector({1, 4, 6, 9}),
+                                 TNotInitedUpdater::FindMissingDsts(make({}), {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector(1, 19),
+                                 TNotInitedUpdater::FindMissingDsts(make({213}), {19, 213}));
+    }
+
+    Y_UNIT_TEST(CreateJsonArray) {
+        UNIT_ASSERT_VALUES_EQUAL("[]", TNotInitedUpdater::CreateJsonArray({}));
+        UNIT_ASSERT_VALUES_EQUAL("[sdlzkjvbsdljhfbsdajlhfbsakjdfb]",
+                                 TNotInitedUpdater::CreateJsonArray({"sdlzkjvbsdljhfbsdajlhfbsakjdfb"}));
+        UNIT_ASSERT_VALUES_EQUAL("[sdlzkjvbsdljhfbsdajlhfbsakjdfb,o92q83yh2uhq2eri23r]",
+                                 TNotInitedUpdater::CreateJsonArray({"sdlzkjvbsdljhfbsdajlhfbsakjdfb",
+                                                                     "o92q83yh2uhq2eri23r"}));
+    }
+
+    Y_UNIT_TEST(AppendArrayToJson) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TNotInitedUpdater::AppendToJsonArray("", {}),
+                                       yexception,
+                                       "previous body required");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TNotInitedUpdater::AppendToJsonArray("[kek", {}),
+                                       yexception,
+                                       "array is broken:");
+
+        UNIT_ASSERT_VALUES_EQUAL("[kek]", TNotInitedUpdater::AppendToJsonArray("kek", {}));
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "[kek,sdlzkjvbsdljhfbsdajlhfbsakjdfb]",
+            TNotInitedUpdater::AppendToJsonArray("kek",
+                                                 {"sdlzkjvbsdljhfbsdajlhfbsakjdfb"}));
+        UNIT_ASSERT_VALUES_EQUAL(
+            "[kek,sdlzkjvbsdljhfbsdajlhfbsakjdfb,o92q83yh2uhq2eri23r]",
+            TNotInitedUpdater::AppendToJsonArray("kek",
+                                                 {"sdlzkjvbsdljhfbsdajlhfbsakjdfb", "o92q83yh2uhq2eri23r"}));
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "[kek,sdlzkjvbsdljhfbsdajlhfbsakjdfb]",
+            TNotInitedUpdater::AppendToJsonArray("[kek]",
+                                                 {"sdlzkjvbsdljhfbsdajlhfbsakjdfb"}));
+        UNIT_ASSERT_VALUES_EQUAL(
+            "[kek,sdlzkjvbsdljhfbsdajlhfbsakjdfb,o92q83yh2uhq2eri23r]",
+            TNotInitedUpdater::AppendToJsonArray("[kek]",
+                                                 {"sdlzkjvbsdljhfbsdajlhfbsakjdfb", "o92q83yh2uhq2eri23r"}));
+    }
+
+    Y_UNIT_TEST(UpdaterTimeouts) {
+        const auto timeout = TDuration::MilliSeconds(10);
+        NTvmApi::TClientSettings s{
+            .SelfTvmId = 100500,
+            .CheckServiceTickets = true,
+            .TvmHost = "localhost",
+            .TvmPort = GetRandomPort(),
+            .TvmSocketTimeout = timeout,
+            .TvmConnectTimeout = timeout,
+        };
+
+        {
+            auto l = MakeIntrusive<TLogger>();
+            auto startTs = ::Now();
+            UNIT_ASSERT_EXCEPTION(NTvmApi::TThreadedUpdater::Create(s, l), yexception);
+            UNIT_ASSERT_LT(::Now() - startTs, timeout * 2);
+        }
+    }
+}
+
+template <>
+void Out<TSmallVec<TString>>(IOutputStream& out, const TSmallVec<TString>& m) {
+    for (const TString& s : m) {
+        out << s << ";";
+    }
+}
+
+template <>
+void Out<TServiceTickets::TMapIdStr>(
+    IOutputStream& out,
+    const TServiceTickets::TMapIdStr& m) {
+    for (const auto& pair : m) {
+        out << pair.first << " -> " << pair.second << ";";
+    }
+}
+
+template <>
+void Out<NTestSuiteApiUpdater::TNotInitedUpdater::TPairTicketsErrors>(
+    IOutputStream& out,
+    const NTestSuiteApiUpdater::TNotInitedUpdater::TPairTicketsErrors& m) {
+    out << m.Tickets << "\n";
+    out << m.Errors << "\n";
+}
+
+template <>
+void Out<NTvmAuth::NTvmApi::TClientSettings::TDst>(IOutputStream& out, const NTvmAuth::NTvmApi::TClientSettings::TDst& m) {
+    out << m.Id;
+}
diff --git a/library/cpp/tvmauth/client/ut/tvmtool_updater_ut.cpp b/library/cpp/tvmauth/client/ut/tvmtool_updater_ut.cpp
new file mode 100644
index 0000000000..9435b46b38
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/tvmtool_updater_ut.cpp
@@ -0,0 +1,756 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/facade.h>
+#include <library/cpp/tvmauth/client/misc/tool/threaded_updater.h>
+
+#include <library/cpp/http/simple/http_client.h>
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/system/env.h>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NTvmTool;
+
+Y_UNIT_TEST_SUITE(ToolUpdater) {
+    static const TString SRV_TICKET = "3:serv:CBAQ__________9_IgYIexCUkQY:GioCM49Ob6_f80y6FY0XBVN4hLXuMlFeyMvIMiDuQnZkbkLpRpQOuQo5YjWoBjM0Vf-XqOm8B7xtrvxSYHDD7Q4OatN2l-Iwg7i71lE3scUeD36x47st3nd0OThvtjrFx_D8mw_c0GT5KcniZlqq1SjhLyAk1b_zJsx8viRAhCU";
+    static const TString SRV_TICKET_DST_100503 = "3:serv:CBAQ__________9_IggIwMQHEJeRBg:Kj7VApP6D91UJ8pKpeaE3vYaNTBBJcdYpJLbF9w2-Mb-75s_SmMKkPqqA2rMS358uFfoYpv9YZxq0tIaUj5HPQ1WaQ1yiVuPZ_oi3pJRdr006eRyihM8PUfl6m9ioCFftfOcAg9oN5BGeHTNhn7VWuj3yMg7feaMB0zAUpyaPG0";
+    static const TString TEST_TICKET = "3:user:CA0Q__________9_Gg4KAgh7EHsg0oXYzAQoAQ:FSADps3wNGm92Vyb1E9IVq5M6ZygdGdt1vafWWEhfDDeCLoVA-sJesxMl2pGW4OxJ8J1r_MfpG3ZoBk8rLVMHUFrPa6HheTbeXFAWl8quEniauXvKQe4VyrpA1SPgtRoFqi5upSDIJzEAe1YRJjq1EClQ_slMt8R0kA_JjKUX54";
+    static const TString PROD_YATEAM_TICKET = "3:user:CAwQ__________9_Gg4KAgh7EHsg0oXYzAQoAg:G2wloFRSi8--RLb2GDSro_sKXPF2JSdL5CVOuOHgUcRvLm-3OxIPn0NUqbJ9DWDmhPplOqEiblIbLK85My1VMJ2aG5SLbRNKEtwfmxLvkwNpl_gUEwWPJm9_8Khslfj71P3hccxtEEqM9bJSMwHueVAY-a9HSzFo-uMFMeSgQ-k";
+
+    class TMetaInfoProxy: public TMetaInfo {
+    public:
+        using TMetaInfo::ApplySettings;
+        using TMetaInfo::BbEnvFromString;
+        using TMetaInfo::Config_;
+        using TMetaInfo::Fetch;
+        using TMetaInfo::ParseMetaString;
+        using TMetaInfo::TMetaInfo;
+    };
+
+    Y_UNIT_TEST(Settings) {
+        NTvmTool::TClientSettings s("foo");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(s.SetAuthToken("\n "),
+                                       TBrokenTvmClientSettings,
+                                       "Auth token cannot be empty");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(s.GetAuthToken(),
+                                       TBrokenTvmClientSettings,
+                                       "Auth token cannot be empty. Env 'TVMTOOL_LOCAL_AUTHTOKEN' and 'QLOUD_TVM_TOKEN' are empty.");
+
+        UNIT_ASSERT_NO_EXCEPTION(s.SetAuthToken(AUTH_TOKEN + "\n"));
+        UNIT_ASSERT_VALUES_EQUAL(AUTH_TOKEN, s.GetAuthToken());
+
+        UNIT_ASSERT_VALUES_EQUAL("localhost", s.GetHostname());
+        UNIT_ASSERT_EXCEPTION_CONTAINS(s.SetHostname(""),
+                                       TBrokenTvmClientSettings,
+                                       "Hostname cannot be empty");
+
+        UNIT_ASSERT_NO_EXCEPTION(s.SetHostname("qwe"));
+        UNIT_ASSERT_VALUES_EQUAL("qwe", s.GetHostname());
+    }
+
+    Y_UNIT_TEST(SettingsCtor) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NTvmTool::TClientSettings(""),
+                                       TBrokenTvmClientSettings,
+                                       "Alias for your TVM client cannot be empty");
+        {
+            NTvmTool::TClientSettings s("self");
+            UNIT_ASSERT_EXCEPTION_CONTAINS(s.GetAuthToken(),
+                                           TBrokenTvmClientSettings,
+                                           "Auth token cannot be empty. "
+                                           "Env 'TVMTOOL_LOCAL_AUTHTOKEN' and 'QLOUD_TVM_TOKEN' are empty.");
+        }
+
+        struct TEnvs {
+            TEnvs(const std::map<TString, TString>& Env) {
+                for (const auto& [key, value] : Env) {
+                    Prev[key] = GetEnv(key);
+                    SetEnv(key, value);
+                }
+            }
+
+            ~TEnvs() {
+                for (const auto& [key, value] : Prev) {
+                    SetEnv(key, value);
+                }
+            }
+
+            std::map<TString, TString> Prev;
+        };
+
+        struct TCase {
+            std::map<TString, TString> Env;
+            TString AuthToken;
+            ui16 Port = 0;
+        };
+
+        std::vector<TCase> cases = {
+            {
+                {
+                    {"TVMTOOL_LOCAL_AUTHTOKEN", "qwerty"},
+                },
+                "qwerty",
+                1,
+            },
+            {
+                {
+                    {"TVMTOOL_LOCAL_AUTHTOKEN", "qwerty"},
+                    {"QLOUD_TVM_TOKEN", "zxcvbn"},
+                },
+                "qwerty",
+                1,
+            },
+            {
+                {
+                    {"QLOUD_TVM_TOKEN", "zxcvbn"},
+                },
+                "zxcvbn",
+                1,
+            },
+            {
+                {
+                    {"TVMTOOL_LOCAL_AUTHTOKEN", "qwerty"},
+                    {"DEPLOY_TVM_TOOL_URL", "32272"},
+                },
+                "qwerty",
+                1,
+            },
+            {
+                {
+                    {"TVMTOOL_LOCAL_AUTHTOKEN", "qwerty"},
+                    {"DEPLOY_TVM_TOOL_URL", "localhost:32272"},
+                },
+                "qwerty",
+                32272,
+            },
+            {
+                {
+                    {"TVMTOOL_LOCAL_AUTHTOKEN", "qwerty"},
+                    {"DEPLOY_TVM_TOOL_URL", "http://localhost:32272"},
+                },
+                "qwerty",
+                32272,
+            },
+        };
+
+        for (const TCase& c : cases) {
+            TEnvs envs(c.Env);
+
+            NTvmTool::TClientSettings s("self");
+            UNIT_ASSERT_VALUES_EQUAL(c.AuthToken, s.GetAuthToken());
+            UNIT_ASSERT_VALUES_EQUAL(c.Port, s.GetPort());
+        }
+    }
+
+    Y_UNIT_TEST(Meta_Fetch) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+        TKeepAliveHttpClient client("localhost", port);
+
+        TMetaInfoProxy m(nullptr);
+        NTvmTool::TClientSettings settings("me");
+        settings.SetAuthToken(AUTH_TOKEN);
+        m.ApplySettings(settings);
+
+        UNIT_ASSERT_VALUES_EQUAL(META, m.Fetch(client));
+
+        settings.SetAuthToken("qwerty");
+        m.ApplySettings(settings);
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.Fetch(client),
+                                       TNonRetriableException,
+                                       "Failed to fetch meta from tvmtool: localhost:");
+
+        settings.SetAuthToken(AUTH_TOKEN);
+        m.ApplySettings(settings);
+        {
+            TKeepAliveHttpClient client("localhost", 0);
+            UNIT_ASSERT_EXCEPTION_CONTAINS(m.Fetch(client),
+                                           TRetriableException,
+                                           "Failed to fetch meta data from tvmtool: ");
+        }
+
+        server.SetGenerator([]() {
+            auto p = new TTvmTool;
+            p->Code = HTTP_NOT_FOUND;
+            return p; });
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.Fetch(client),
+                                       TNonRetriableException,
+                                       "Library does not support so old tvmtool. You need tvmtool>=1.1.0");
+        server.SetGenerator([]() {
+            auto p = new TTvmTool;
+            p->Code = HTTP_INTERNAL_SERVER_ERROR;
+            return p; });
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.Fetch(client),
+                                       TRetriableException,
+                                       "Failed to fetch meta from tvmtool: localhost:");
+    }
+
+    Y_UNIT_TEST(Meta_ParseMetaString_me) {
+        TMetaInfo::TConfigPtr c;
+        UNIT_ASSERT(c = TMetaInfoProxy::ParseMetaString(META, "me"));
+        UNIT_ASSERT_VALUES_EQUAL(100500, c->SelfTvmId);
+        UNIT_ASSERT_EQUAL(EBlackboxEnv::ProdYateam, c->BbEnv);
+        UNIT_ASSERT_VALUES_EQUAL("", c->IdmSlug);
+        UNIT_ASSERT_EQUAL(TMetaInfo::TDstAliases({{"bbox", 242}, {"pass_likers", 11}}), c->DstAliases);
+    }
+
+    Y_UNIT_TEST(Meta_ParseMetaString_tenant_with_roles) {
+        TMetaInfo::TConfigPtr c;
+        UNIT_ASSERT(c = TMetaInfoProxy::ParseMetaString(META, "tenant_with_roles"));
+        UNIT_ASSERT_VALUES_EQUAL(100500, c->SelfTvmId);
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::ProdYateam, c->BbEnv);
+        UNIT_ASSERT_VALUES_EQUAL("some_slug", c->IdmSlug);
+        UNIT_ASSERT_VALUES_EQUAL(TMetaInfo::TDstAliases(), c->DstAliases);
+    }
+
+    Y_UNIT_TEST(Meta_ParseMetaString_pc) {
+        TMetaInfo::TConfigPtr c;
+        UNIT_ASSERT(c = TMetaInfoProxy::ParseMetaString(META, "push-client"));
+        UNIT_ASSERT_VALUES_EQUAL(100501, c->SelfTvmId);
+        UNIT_ASSERT_EQUAL(EBlackboxEnv::ProdYateam, c->BbEnv);
+        UNIT_ASSERT_VALUES_EQUAL("", c->IdmSlug);
+        UNIT_ASSERT_EQUAL(TMetaInfo::TDstAliases({{"pass_likers", 100502}}), c->DstAliases);
+    }
+
+    Y_UNIT_TEST(Meta_ParseMetaString_se) {
+        TMetaInfo::TConfigPtr c;
+        UNIT_ASSERT(c = TMetaInfoProxy::ParseMetaString(META, "something_else"));
+        UNIT_ASSERT_VALUES_EQUAL(100503, c->SelfTvmId);
+        UNIT_ASSERT_EQUAL(EBlackboxEnv::ProdYateam, c->BbEnv);
+        UNIT_ASSERT_VALUES_EQUAL("", c->IdmSlug);
+        UNIT_ASSERT(c->DstAliases.empty());
+    }
+
+    Y_UNIT_TEST(Meta_ParseMetaString_errors) {
+        TMetaInfoProxy m(nullptr);
+        UNIT_ASSERT(!m.ParseMetaString(META, "ololo"));
+
+        TString meta = "}";
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.ParseMetaString(meta, "qqq"), yexception, meta);
+        meta = "{}";
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.ParseMetaString(meta, "qqq"), yexception, meta);
+        meta = R"({"tenants" : {}})";
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.ParseMetaString(meta, "qqq"), yexception, meta);
+        meta = R"({"tenants" : [{"self":{}}]})";
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.ParseMetaString(meta, "qqq"), yexception, meta);
+    }
+
+    Y_UNIT_TEST(Meta_BbEnvFromString) {
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::Prod, TMetaInfoProxy::BbEnvFromString("Prod", META));
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::Test, TMetaInfoProxy::BbEnvFromString("Test", META));
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::ProdYateam, TMetaInfoProxy::BbEnvFromString("ProdYaTeam", META));
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::TestYateam, TMetaInfoProxy::BbEnvFromString("TestYaTeam", META));
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::Stress, TMetaInfoProxy::BbEnvFromString("Stress", META));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TMetaInfoProxy::BbEnvFromString("foo", META),
+                                       yexception,
+                                       "'bb_env'=='foo'");
+    }
+
+    Y_UNIT_TEST(Meta_ApplySettings) {
+        NTvmTool::TClientSettings s("foo");
+        s.SetAuthToken(AUTH_TOKEN);
+
+        TMetaInfoProxy m(nullptr);
+        m.ApplySettings(s);
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TKeepAliveHttpClient::THeaders({{"Authorization", AUTH_TOKEN}}),
+            m.GetAuthHeader());
+    }
+
+    Y_UNIT_TEST(Meta_Init) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+        TKeepAliveHttpClient client("localhost", port);
+
+        NTvmTool::TClientSettings s("me");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        auto l = MakeIntrusive<TLogger>();
+        TMetaInfo m(l);
+        UNIT_ASSERT_NO_EXCEPTION(m.Init(client, s));
+        UNIT_ASSERT_VALUES_EQUAL(100500, m.GetConfig()->SelfTvmId);
+        UNIT_ASSERT_EQUAL(EBlackboxEnv::ProdYateam, m.GetConfig()->BbEnv);
+        UNIT_ASSERT_EQUAL(TMetaInfo::TDstAliases({{"bbox", 242}, {"pass_likers", 11}}), m.GetConfig()->DstAliases);
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuilder()
+                                     << "7: Meta info fetched from localhost:" << port << "\n"
+                                     << "6: Meta: self_tvm_id=100500, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[(pass_likers:11)(bbox:242)]\n",
+                                 l->Stream.Str());
+        l->Stream.Clear();
+        UNIT_ASSERT_VALUES_EQUAL(
+            "/tvm/tickets?src=100500&dsts=11,242",
+            TMetaInfo::GetRequestForTickets(*m.GetConfig()));
+
+        server.SetGenerator([]() {
+            auto p = new TTvmTool;
+            p->Meta = R"({
+        "bb_env" : "Prod",
+        "tenants" : [{
+                "self": {"alias" : "me", "client_id": 100500},
+                "dsts" : [{"alias" : "pass_likers","client_id": 11}]
+            }]
+        })";
+            return p; });
+        UNIT_ASSERT(m.TryUpdateConfig(client));
+        UNIT_ASSERT_VALUES_EQUAL(
+            "6: Meta was updated. Old: (self_tvm_id=100500, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[(pass_likers:11)(bbox:242)]). New: (self_tvm_id=100500, bb_env=Prod, idm_slug=<NULL>, dsts=[(pass_likers:11)])\n",
+            l->Stream.Str());
+        l->Stream.clear();
+
+        s = NTvmTool::TClientSettings("foo");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        TMetaInfo m2(l);
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m2.Init(client, s), TNonRetriableException, "Alias 'foo' not found in meta info");
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuilder()
+                                     << "7: Meta info fetched from localhost:" << port << "\n",
+                                 l->Stream.Str());
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TMetaInfo::GetRequestForTickets({}),
+                                       yexception,
+                                       "DstAliases.empty()");
+
+        server.SetGenerator([]() {
+            auto p = new TTvmTool;
+            p->Meta = "}";
+            return p; });
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.Init(client, s),
+                                       TNonRetriableException,
+                                       "Malformed json from tvmtool:");
+    }
+
+    class TNonInitedUpdater: public TThreadedUpdater {
+    public:
+        TNonInitedUpdater(const TString& host, ui16 port, TLoggerPtr logger)
+            : TThreadedUpdater(host, port, TDuration::Seconds(5), TDuration::Seconds(30), logger)
+        {
+        }
+
+        using TThreadedUpdater::ArePublicKeysOk;
+        using TThreadedUpdater::AreServiceTicketsOk;
+        using TThreadedUpdater::FetchPublicKeys;
+        using TThreadedUpdater::FetchServiceTickets;
+        using TThreadedUpdater::GetBirthTimeFromResponse;
+        using TThreadedUpdater::Init;
+        using TThreadedUpdater::IsTimeToUpdatePublicKeys;
+        using TThreadedUpdater::IsTimeToUpdateServiceTickets;
+        using TThreadedUpdater::LastVisitForConfig_;
+        using TThreadedUpdater::MetaInfo_;
+        using TThreadedUpdater::ParseFetchTicketsResponse;
+        using TThreadedUpdater::SetBbEnv;
+        using TThreadedUpdater::SetServiceContext;
+        using TThreadedUpdater::SetServiceTickets;
+        using TThreadedUpdater::SetUpdateTimeOfPublicKeys;
+        using TThreadedUpdater::SetUpdateTimeOfServiceTickets;
+        using TThreadedUpdater::SetUserContext;
+        using TThreadedUpdater::TPairTicketsErrors;
+        using TThreadedUpdater::UpdateKeys;
+        using TThreadedUpdater::UpdateServiceTickets;
+    };
+
+    Y_UNIT_TEST(GetBirthTimeFromResponse) {
+        THttpHeaders h;
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TNonInitedUpdater::GetBirthTimeFromResponse(h, "ololo"),
+                                       yexception,
+                                       "Failed to fetch bithtime of ololo from tvmtool");
+
+        h.AddHeader(THttpInputHeader("X-Ya-Tvmtool-Data-Birthtime: qwe"));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TNonInitedUpdater::GetBirthTimeFromResponse(h, "ololo"),
+                                       yexception,
+                                       "Bithtime of ololo from tvmtool must be unixtime. Got: qwe");
+
+        h.AddOrReplaceHeader(THttpInputHeader("X-Ya-Tvmtool-Data-Birthtime: 123"));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(123), TNonInitedUpdater::GetBirthTimeFromResponse(h, "ololo"));
+    }
+
+    Y_UNIT_TEST(Fetch) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+        TKeepAliveHttpClient client("localhost", port);
+
+        auto l = MakeIntrusive<TLogger>();
+        TNonInitedUpdater u("localhost", port, l);
+        NTvmTool::TClientSettings s("me");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        u.MetaInfo_.Init(client, s);
+        auto p = u.FetchPublicKeys();
+        UNIT_ASSERT_STRINGS_EQUAL(NUnittest::TVMKNIFE_PUBLIC_KEYS, p.first);
+        UNIT_ASSERT_VALUES_EQUAL(BIRTHTIME, p.second);
+
+        auto p2 = u.FetchServiceTickets(*u.MetaInfo_.GetConfig());
+        UNIT_ASSERT_STRINGS_EQUAL(TICKETS_ME, p2.first);
+        UNIT_ASSERT_VALUES_EQUAL(BIRTHTIME, p2.second);
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100500, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[(pass_likers:11)(bbox:242)]\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(ParseFetchTicketsResponse) {
+        auto l = MakeIntrusive<TLogger>();
+        TNonInitedUpdater u("", 0, l);
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(u.ParseFetchTicketsResponse("}", {}),
+                                       yexception,
+                                       "Invalid json from tvmtool: }");
+
+        auto t = u.ParseFetchTicketsResponse(TICKETS_ME, {{"pass_likers", 11}, {"se", 2}});
+        auto expected = TNonInitedUpdater::TPairTicketsErrors{
+            {{11, "3:serv:CBAQ__________9_IgYIlJEGEAs:T-apeMNWFc_vHPQ3iLaZv9NjG-hf5-i23O4AhRu1M68ryN3FU5qvyqTSSiPbtJdFP6EE41QQBzEs59dHn9DRkqQNwwKf1is00Oewwj2XKO0uHukuzd9XxZnro7MfjPswsjWufxX28rmJtlfSXwAtyKt8TI5yKJnMeBPQ0m5R3k8"}},
+            {
+                {2, "Missing tvm_id in response, should never happend: se"},
+            },
+        };
+        UNIT_ASSERT_VALUES_EQUAL(expected, t);
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "3: Failed to get ServiceTicket for se (2): Missing tvm_id in response, should never happend: se\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(Update) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+        TKeepAliveHttpClient client("localhost", port);
+
+        auto l = MakeIntrusive<TLogger>();
+        TNonInitedUpdater u("localhost", port, l);
+        NTvmTool::TClientSettings s("me");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        u.MetaInfo_.Init(client, s);
+
+        using TTickets = TServiceTickets::TMapAliasStr;
+        UNIT_ASSERT(!u.GetCachedServiceTickets());
+        UNIT_ASSERT_VALUES_EQUAL(BIRTHTIME, u.UpdateServiceTickets(*u.MetaInfo_.GetConfig()));
+        UNIT_ASSERT(u.GetCachedServiceTickets());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), u.GetUpdateTimeOfServiceTickets());
+        UNIT_ASSERT_EQUAL(
+            TTickets({
+                {"bbox", "3:serv:CBAQ__________9_IgcIlJEGEPIB:N7luw0_rVmBosTTI130jwDbQd0-cMmqJeEl0ma4ZlIo_mHXjBzpOuMQ3A9YagbmOBOt8TZ_gzGvVSegWZkEeB24gM22acw0w-RcHaQKrzSOA5Zq8WLNIC8QUa4_WGTlAsb7R7eC4KTAGgouIquNAgMBdTuGOuZHnMLvZyLnOMKc"},
+                {"pass_likers", "3:serv:CBAQ__________9_IgYIlJEGEAs:T-apeMNWFc_vHPQ3iLaZv9NjG-hf5-i23O4AhRu1M68ryN3FU5qvyqTSSiPbtJdFP6EE41QQBzEs59dHn9DRkqQNwwKf1is00Oewwj2XKO0uHukuzd9XxZnro7MfjPswsjWufxX28rmJtlfSXwAtyKt8TI5yKJnMeBPQ0m5R3k8"},
+            }),
+            u.GetCachedServiceTickets()->TicketsByAlias);
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100500, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[(pass_likers:11)(bbox:242)]\n",
+            l->Stream.Str());
+        l->Stream.Clear();
+
+        UNIT_ASSERT(!u.GetCachedServiceContext());
+        UNIT_ASSERT(!u.GetCachedUserContext());
+        UNIT_ASSERT_VALUES_EQUAL(BIRTHTIME, u.UpdateKeys(*u.MetaInfo_.GetConfig()));
+        UNIT_ASSERT(u.GetCachedServiceContext());
+        UNIT_ASSERT(!u.GetCachedUserContext());
+        u.SetBbEnv(EBlackboxEnv::Test);
+        UNIT_ASSERT(u.GetCachedUserContext());
+        UNIT_ASSERT_VALUES_EQUAL("", l->Stream.Str());
+        l->Stream.Clear();
+
+        {
+            TAsyncUpdaterPtr u = TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT(u->GetCachedServiceTickets());
+            UNIT_ASSERT(u->GetCachedServiceContext());
+            UNIT_ASSERT(u->GetCachedUserContext());
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus());
+
+            NTvmAuth::TTvmClient c(u);
+            UNIT_ASSERT(c.CheckServiceTicket(SRV_TICKET));
+            UNIT_ASSERT(!c.CheckServiceTicket(SRV_TICKET_DST_100503));
+            UNIT_ASSERT(c.CheckUserTicket(PROD_YATEAM_TICKET));
+            UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIlJEGEAs:T-apeMNWFc_vHPQ3iLaZv9NjG-hf5-i23O4AhRu1M68ryN3FU5qvyqTSSiPbtJdFP6EE41QQBzEs59dHn9DRkqQNwwKf1is00Oewwj2XKO0uHukuzd9XxZnro7MfjPswsjWufxX28rmJtlfSXwAtyKt8TI5yKJnMeBPQ0m5R3k8", c.GetServiceTicketFor("pass_likers"));
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100500, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[(pass_likers:11)(bbox:242)]\n"
+                << "7: Tickets fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Public keys fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+        l->Stream.Clear();
+
+        {
+            NTvmTool::TClientSettings s("something_else");
+            s.SetAuthToken(AUTH_TOKEN);
+            s.SetPort(port);
+
+            TAsyncUpdaterPtr u = TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT(!u->GetCachedServiceTickets());
+            UNIT_ASSERT(u->GetCachedServiceContext());
+            UNIT_ASSERT(u->GetCachedUserContext());
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus());
+
+            NTvmAuth::TTvmClient c(u);
+            UNIT_ASSERT(!c.CheckServiceTicket(SRV_TICKET));
+            UNIT_ASSERT(c.CheckServiceTicket(SRV_TICKET_DST_100503));
+            UNIT_ASSERT(c.CheckUserTicket(PROD_YATEAM_TICKET));
+            UNIT_ASSERT_EXCEPTION_CONTAINS(c.GetServiceTicketFor("pass_likers"),
+                                           TBrokenTvmClientSettings,
+                                           "Need to enable ServiceTickets fetching");
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100503, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[]\n"
+                << "7: Public keys fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+        l->Stream.Clear();
+    }
+
+    Y_UNIT_TEST(IsOk) {
+        TNonInitedUpdater u("", 0, TDevNullLogger::IAmBrave());
+        using TTickets = TServiceTickets::TMapIdStr;
+
+        UNIT_ASSERT(u.AreServiceTicketsOk(0));
+        UNIT_ASSERT(!u.AreServiceTicketsOk(2));
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(TTickets(),
+                                                                TTickets(),
+                                                                TServiceTickets::TMapAliasId()));
+        UNIT_ASSERT(u.AreServiceTicketsOk(0));
+        UNIT_ASSERT(!u.AreServiceTicketsOk(2));
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            TTickets({
+                {1, "mega_ticket"},
+                {2, "mega_ticket2"},
+            }),
+            TTickets({
+                {3, "mega_error3"},
+            }),
+            TServiceTickets::TMapAliasId()));
+        UNIT_ASSERT(u.AreServiceTicketsOk(0));
+        UNIT_ASSERT(!u.AreServiceTicketsOk(2));
+
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            TTickets({
+                {1, "mega_ticket"},
+                {2, "mega_ticket2"},
+            }),
+            TTickets({
+                {3, "mega_error3"},
+            }),
+            TServiceTickets::TMapAliasId({
+                {"mega_ticket", 1},
+                {"mega_ticket2", 2},
+                {"mega_ticket3", 3},
+            })));
+        UNIT_ASSERT(u.AreServiceTicketsOk(2));
+
+        UNIT_ASSERT(!u.ArePublicKeysOk());
+        u.SetServiceContext(MakeIntrusiveConst<TServiceContext>(
+            TServiceContext::CheckingFactory(12, NUnittest::TVMKNIFE_PUBLIC_KEYS)));
+        UNIT_ASSERT(!u.ArePublicKeysOk());
+        u.SetUserContext(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT(!u.ArePublicKeysOk());
+        u.SetBbEnv(EBlackboxEnv::Test);
+        UNIT_ASSERT(u.ArePublicKeysOk());
+    }
+
+    Y_UNIT_TEST(IsTimeToUpdate) {
+        TNonInitedUpdater u("", 0, TDevNullLogger::IAmBrave());
+
+        UNIT_ASSERT(!u.IsTimeToUpdatePublicKeys(TInstant::Now() - TDuration::Seconds(597)));
+        UNIT_ASSERT(u.IsTimeToUpdatePublicKeys(TInstant::Now() - TDuration::Seconds(603)));
+
+        TMetaInfo::TConfig cfg;
+        UNIT_ASSERT(!u.IsTimeToUpdateServiceTickets(cfg, TInstant::Now() - TDuration::Seconds(597)));
+        UNIT_ASSERT(!u.IsTimeToUpdateServiceTickets(cfg, TInstant::Now() - TDuration::Seconds(603)));
+
+        cfg.DstAliases = {{"q", 1}};
+        UNIT_ASSERT(!u.IsTimeToUpdateServiceTickets(cfg, TInstant::Now() - TDuration::Seconds(597)));
+        UNIT_ASSERT(u.IsTimeToUpdateServiceTickets(cfg, TInstant::Now() - TDuration::Seconds(603)));
+    }
+
+    Y_UNIT_TEST(InitWithOldData) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port,
+                                  []() {
+                                      auto p = new TTvmTool;
+                                      p->Birthtime = TInstant::Seconds(123);
+                                      return p;
+                                  });
+
+        NTvmTool::TClientSettings s("me");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TThreadedUpdater::Create(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry: ");
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100500, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[(pass_likers:11)(bbox:242)]\n"
+                << "4: Error while fetching of tickets: Service tickets are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Service tickets have not been refreshed for too long period\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "4: Error while fetching of tickets: Service tickets are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Service tickets have not been refreshed for too long period\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "4: Error while fetching of tickets: Service tickets are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Service tickets have not been refreshed for too long period\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(InitWithOldData_onlyKeys) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port,
+                                  []() {
+                                      auto p = new TTvmTool;
+                                      p->Birthtime = TInstant::Seconds(123);
+                                      return p;
+                                  });
+
+        NTvmTool::TClientSettings s("something_else");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+
+        {
+            s.OverrideBlackboxEnv(EBlackboxEnv::Stress);
+            auto l = MakeIntrusive<TLogger>();
+            UNIT_ASSERT_EXCEPTION_CONTAINS(TThreadedUpdater::Create(s, l),
+                                           TBrokenTvmClientSettings,
+                                           "Overriding of BlackboxEnv is illegal: ProdYateam -> Stress");
+        }
+
+        s.OverrideBlackboxEnv(EBlackboxEnv::Prod);
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TThreadedUpdater::Create(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry: ");
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100503, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[]\n"
+                << "6: Meta: override blackbox env: ProdYateam->Prod\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(Init) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+
+        NTvmTool::TClientSettings s("push-client");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        s.SetHostname("localhost");
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TAsyncUpdaterPtr u = TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100501, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[(pass_likers:100502)]\n"
+                << "7: Tickets fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Public keys fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(InitWithoutTvmtool) {
+        NTvmTool::TClientSettings s("me");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(0);
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TThreadedUpdater::Create(s, TDevNullLogger::IAmBrave()),
+                                       TNonRetriableException,
+                                       "can not connect to ");
+    }
+
+    Y_UNIT_TEST(GetStatus) {
+        TNonInitedUpdater u("", 0, TDevNullLogger::IAmBrave());
+        TMetaInfoProxy m(nullptr);
+        m.Config_ = std::make_shared<TMetaInfo::TConfig>();
+        u.MetaInfo_ = m;
+        u.LastVisitForConfig_ = TInstant::Now();
+
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Error, u.GetStatus());
+        u.SetUpdateTimeOfPublicKeys(TInstant::Now() - TDuration::Days(3));
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, u.GetStatus());
+        u.SetUpdateTimeOfPublicKeys(TInstant::Now() - TDuration::Hours(3));
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+
+        u.SetServiceTickets(new TServiceTickets({}, {}, {}));
+
+        TMetaInfo::TConfig cfg;
+        cfg.DstAliases = {{"q", 1}, {"q2", 2}};
+        m.Config_ = std::make_shared<TMetaInfo::TConfig>(cfg);
+        u.MetaInfo_ = m;
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Error, u.GetStatus());
+        u.SetUpdateTimeOfServiceTickets(TInstant::Now() - TDuration::Hours(3));
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Error, u.GetStatus());
+
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            TServiceTickets::TMapIdStr({{1, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}, {2, "t"}}),
+            TServiceTickets::TMapIdStr({{3, "mega_error"}, {4, "error2"}}),
+            TServiceTickets::TMapAliasId({
+                {"some_alias#1", 1},
+                {"some_alias#2", 2},
+            })));
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, u.GetStatus());
+
+        const TInstant* inv = &u.GetCachedServiceTickets()->InvalidationTime;
+        *const_cast<TInstant*>(inv) = TInstant::Now() + TDuration::Hours(3);
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, u.GetStatus());
+
+        u.SetUpdateTimeOfServiceTickets(TInstant::Now() - TDuration::Minutes(3));
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+
+        u.LastVisitForConfig_ = TInstant::Now() - TDuration::Minutes(1);
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, u.GetStatus());
+    }
+
+    Y_UNIT_TEST(multiNamesForDst) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+
+        NTvmTool::TClientSettings s("multi_names_for_dst");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        s.SetHostname("localhost");
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TAsyncUpdaterPtr u = TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100599, bb_env=ProdYateam, idm_slug=<NULL>, dsts=[(pass_haters:100502)(pass_likers:100502)]\n"
+                << "7: Tickets fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Public keys fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/utils_ut.cpp b/library/cpp/tvmauth/client/ut/utils_ut.cpp
new file mode 100644
index 0000000000..e780fb2779
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/utils_ut.cpp
@@ -0,0 +1,88 @@
+#include <library/cpp/tvmauth/client/misc/utils.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+Y_UNIT_TEST_SUITE(UtilsTest) {
+    using namespace NTvmAuth;
+
+    Y_UNIT_TEST(ParseDstMap) {
+        using TMap = NTvmAuth::NTvmApi::TClientSettings::TDstMap;
+        UNIT_ASSERT_EQUAL(TMap(), NUtils::ParseDstMap(""));
+        UNIT_ASSERT_EXCEPTION(NUtils::ParseDstMap(";"), TFromStringException);
+        UNIT_ASSERT_EXCEPTION(NUtils::ParseDstMap(":"), TFromStringException);
+        UNIT_ASSERT_EXCEPTION(NUtils::ParseDstMap("3;"), TFromStringException);
+        UNIT_ASSERT_EXCEPTION(NUtils::ParseDstMap("3:foo;"), TFromStringException);
+
+        UNIT_ASSERT_EQUAL(TMap({
+                              {"foo", 3},
+                          }),
+                          NUtils::ParseDstMap("foo:3"));
+        UNIT_ASSERT_EQUAL(TMap({
+                              {"foo", 3},
+                              {"bar", 17},
+                          }),
+                          NUtils::ParseDstMap("foo:3;bar:17;"));
+    }
+
+    Y_UNIT_TEST(ParseDstVector) {
+        using TVector = NTvmAuth::NTvmApi::TClientSettings::TDstVector;
+        UNIT_ASSERT_EQUAL(TVector(), NUtils::ParseDstVector(""));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NUtils::ParseDstVector(";"),
+                                       yexception,
+                                       "Cannot parse empty string as number");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NUtils::ParseDstVector(":"),
+                                       yexception,
+                                       "Unexpected symbol");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NUtils::ParseDstVector("3:foo;"),
+                                       yexception,
+                                       "Unexpected symbol");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NUtils::ParseDstVector("foo:3;"),
+                                       yexception,
+                                       "Unexpected symbol");
+
+        UNIT_ASSERT_EQUAL(TVector(1, 3),
+                          NUtils::ParseDstVector("3"));
+        UNIT_ASSERT_EQUAL(TVector({3, 17}),
+                          NUtils::ParseDstVector("3;17;"));
+    }
+
+    Y_UNIT_TEST(ToHex) {
+        UNIT_ASSERT_VALUES_EQUAL("", NUtils::ToHex(""));
+        UNIT_ASSERT_VALUES_EQUAL("61", NUtils::ToHex("a"));
+        UNIT_ASSERT_VALUES_EQUAL(
+            "6C6B787A6E7620736C6A6876627761656220",
+            NUtils::ToHex("lkxznv sljhvbwaeb "));
+    }
+
+    Y_UNIT_TEST(CheckBbEnvOverriding) {
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Prod, EBlackboxEnv::Prod));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Prod, EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Prod, EBlackboxEnv::Test));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Prod, EBlackboxEnv::TestYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Prod, EBlackboxEnv::Stress));
+
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::ProdYateam, EBlackboxEnv::Prod));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::ProdYateam, EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::ProdYateam, EBlackboxEnv::Test));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::ProdYateam, EBlackboxEnv::TestYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::ProdYateam, EBlackboxEnv::Stress));
+
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Test, EBlackboxEnv::Prod));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Test, EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Test, EBlackboxEnv::Test));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Test, EBlackboxEnv::TestYateam));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Test, EBlackboxEnv::Stress));
+
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::TestYateam, EBlackboxEnv::Prod));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::TestYateam, EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::TestYateam, EBlackboxEnv::Test));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::TestYateam, EBlackboxEnv::TestYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::TestYateam, EBlackboxEnv::Stress));
+
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Stress, EBlackboxEnv::Prod));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Stress, EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Stress, EBlackboxEnv::Test));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Stress, EBlackboxEnv::TestYateam));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Stress, EBlackboxEnv::Stress));
+    }
+}
diff --git a/library/cpp/tvmauth/deprecated/service_context.cpp b/library/cpp/tvmauth/deprecated/service_context.cpp
new file mode 100644
index 0000000000..208206a9dd
--- /dev/null
+++ b/library/cpp/tvmauth/deprecated/service_context.cpp
@@ -0,0 +1,37 @@
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+#include <library/cpp/tvmauth/src/service_impl.h>
+
+namespace NTvmAuth {
+    static const char* EX_MSG = "ServiceContext already moved out";
+
+    TServiceContext::TServiceContext(TStringBuf secretBase64, TTvmId selfTvmId, TStringBuf tvmKeysResponse)
+        : Impl_(MakeHolder<TImpl>(secretBase64, selfTvmId, tvmKeysResponse))
+    {
+    }
+
+    TServiceContext::TServiceContext(TServiceContext&& o) = default;
+    TServiceContext& TServiceContext::operator=(TServiceContext&& o) = default;
+    TServiceContext::~TServiceContext() = default;
+
+    TServiceContext TServiceContext::CheckingFactory(TTvmId selfTvmId, TStringBuf tvmKeysResponse) {
+        TServiceContext c;
+        c.Impl_ = MakeHolder<TImpl>(selfTvmId, tvmKeysResponse);
+        return c;
+    }
+
+    TServiceContext TServiceContext::SigningFactory(TStringBuf secretBase64) {
+        TServiceContext c;
+        c.Impl_ = MakeHolder<TImpl>(secretBase64);
+        return c;
+    }
+
+    TCheckedServiceTicket TServiceContext::Check(TStringBuf ticketBody, const TCheckFlags& flags) const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->Check(ticketBody, flags);
+    }
+
+    TString TServiceContext::SignCgiParamsForTvm(TStringBuf ts, TStringBuf dst, TStringBuf scopes) const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->SignCgiParamsForTvm(ts, dst, scopes);
+    }
+}
diff --git a/library/cpp/tvmauth/deprecated/service_context.h b/library/cpp/tvmauth/deprecated/service_context.h
new file mode 100644
index 0000000000..bdf1bb5224
--- /dev/null
+++ b/library/cpp/tvmauth/deprecated/service_context.h
@@ -0,0 +1,72 @@
+#pragma once
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+
+#include <util/generic/ptr.h>
+
+namespace NTvmAuth {
+    class TServiceContext: public TAtomicRefCount<TServiceContext> {
+    public:
+        /*!
+         * @struct TCheckFlags holds flags that control checking
+         */
+        struct TCheckFlags {
+            TCheckFlags() {
+            }
+            bool NeedDstCheck = true;
+        };
+
+        /*!
+         * Create service context. Serivce contexts are used to store TVM keys and parse service tickets.
+         * @param selfTvmId
+         * @param secretBase64
+         * @param tvmKeysResponse
+         */
+        TServiceContext(TStringBuf secretBase64, TTvmId selfTvmId, TStringBuf tvmKeysResponse);
+        TServiceContext(TServiceContext&&);
+        ~TServiceContext();
+
+        /*!
+         * Create service context only for checking service tickets
+         * \param[in] selfTvmId
+         * \param[in] tvmKeysResponse
+         * \return
+         */
+        static TServiceContext CheckingFactory(TTvmId selfTvmId, TStringBuf tvmKeysResponse);
+
+        /*!
+         * Create service context only for signing HTTP request to TVM-API
+         * \param[in] secretBase64
+         * \return
+         */
+        static TServiceContext SigningFactory(TStringBuf secretBase64);
+
+        TServiceContext& operator=(TServiceContext&&);
+
+        /*!
+         * Parse and validate service ticket body then create TCheckedServiceTicket object.
+         * @param ticketBody
+         * @return TCheckedServiceTicket object
+         */
+        TCheckedServiceTicket Check(TStringBuf ticketBody, const TCheckFlags& flags = {}) const;
+
+        /*!
+         * Sign params for TVM API
+         * @param ts Param 'ts' of request to TVM
+         * @param dst Param 'dst' of request to TVM
+         * @param scopes Param 'scopes' of request to TVM
+         * @return Signed string
+         */
+        TString SignCgiParamsForTvm(TStringBuf ts, TStringBuf dst, TStringBuf scopes = TStringBuf()) const;
+
+        class TImpl;
+
+    private:
+        TServiceContext() = default;
+
+    private:
+        THolder<TImpl> Impl_;
+    };
+
+    using TServiceContextPtr = TIntrusiveConstPtr<TServiceContext>;
+}
diff --git a/library/cpp/tvmauth/deprecated/user_context.cpp b/library/cpp/tvmauth/deprecated/user_context.cpp
new file mode 100644
index 0000000000..712f622f1a
--- /dev/null
+++ b/library/cpp/tvmauth/deprecated/user_context.cpp
@@ -0,0 +1,20 @@
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+#include <library/cpp/tvmauth/src/user_impl.h>
+
+namespace NTvmAuth {
+    static const char* EX_MSG = "UserContext already moved out";
+
+    TUserContext::TUserContext(EBlackboxEnv env, TStringBuf tvmKeysResponse)
+        : Impl_(MakeHolder<TImpl>(env, tvmKeysResponse))
+    {
+    }
+
+    TUserContext::TUserContext(TUserContext&& o) = default;
+    TUserContext& TUserContext::operator=(TUserContext&& o) = default;
+    TUserContext::~TUserContext() = default;
+
+    TCheckedUserTicket TUserContext::Check(TStringBuf ticketBody) const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->Check(ticketBody);
+    }
+}
diff --git a/library/cpp/tvmauth/deprecated/user_context.h b/library/cpp/tvmauth/deprecated/user_context.h
new file mode 100644
index 0000000000..f7fe67d02e
--- /dev/null
+++ b/library/cpp/tvmauth/deprecated/user_context.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+
+#include <util/generic/ptr.h>
+
+namespace NTvmAuth {
+    class TUserContext: public TAtomicRefCount<TUserContext> {
+    public:
+        TUserContext(EBlackboxEnv env, TStringBuf tvmKeysResponse);
+        TUserContext(TUserContext&&);
+        ~TUserContext();
+
+        TUserContext& operator=(TUserContext&&);
+
+        /*!
+         * Parse and validate user ticket body then create TCheckedUserTicket object.
+         * @param ticketBody
+         * @return TCheckedUserTicket object
+         */
+        TCheckedUserTicket Check(TStringBuf ticketBody) const;
+
+        class TImpl;
+
+    private:
+        THolder<TImpl> Impl_;
+    };
+
+    using TUserContextPtr = TIntrusiveConstPtr<TUserContext>;
+}
diff --git a/library/cpp/tvmauth/exception.h b/library/cpp/tvmauth/exception.h
new file mode 100644
index 0000000000..f528886b95
--- /dev/null
+++ b/library/cpp/tvmauth/exception.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <util/generic/yexception.h>
+
+#include <exception>
+
+namespace NTvmAuth {
+    class TTvmException: public yexception {
+    };
+    class TContextException: public TTvmException {
+    };
+    class TMalformedTvmSecretException: public TContextException {
+    };
+    class TMalformedTvmKeysException: public TContextException {
+    };
+    class TEmptyTvmKeysException: public TContextException {
+    };
+    class TNotAllowedException: public TTvmException {
+    };
+}
diff --git a/library/cpp/tvmauth/src/parser.cpp b/library/cpp/tvmauth/src/parser.cpp
new file mode 100644
index 0000000000..358de58d36
--- /dev/null
+++ b/library/cpp/tvmauth/src/parser.cpp
@@ -0,0 +1,97 @@
+#include "parser.h"
+
+#include "utils.h"
+
+#include <library/cpp/tvmauth/exception.h>
+
+#include <util/generic/strbuf.h>
+#include <util/string/split.h>
+
+#include <ctime>
+
+namespace NTvmAuth {
+    TString TParserTvmKeys::ParseStrV1(TStringBuf str) {
+        while (str && str.back() == '\n') {
+            str.Chop(1);
+        }
+
+        TStringBuf ver = str.NextTok(DELIM);
+        if (!str || !ver || ver != "1") {
+            throw TMalformedTvmKeysException() << "Malformed TVM keys";
+        }
+        TString res = NUtils::Base64url2bin(str);
+        if (res.empty()) {
+            throw TMalformedTvmKeysException() << "Malformed TVM keys";
+        }
+        return res;
+    }
+
+    TStringBuf TParserTickets::UserFlag() {
+        static const char BUF_[] = "user";
+        return TStringBuf(BUF_, sizeof(BUF_) - 1);
+    }
+
+    TStringBuf TParserTickets::ServiceFlag() {
+        static const char BUF_[] = "serv";
+        return TStringBuf(BUF_, sizeof(BUF_) - 1);
+    }
+
+    TParserTickets::TRes TParserTickets::ParseV3(TStringBuf body, const NRw::TPublicKeys& keys, TStringBuf type) {
+        TStrRes str = ParseStrV3(body, type);
+        TRes res(str.Status);
+        if (str.Status != ETicketStatus::Ok) {
+            return TRes(str.Status);
+        }
+        if (!res.Ticket.ParseFromString(str.Proto)) {
+            res.Status = ETicketStatus::Malformed;
+            return res;
+        }
+        if (res.Ticket.expirationtime() <= time(nullptr)) {
+            res.Status = ETicketStatus::Expired;
+            return res;
+        }
+
+        auto itKey = keys.find(res.Ticket.keyid());
+        if (itKey == keys.end()) {
+            res.Status = ETicketStatus::MissingKey;
+            return res;
+        }
+        if (!itKey->second.CheckSign(str.ForCheck, str.Sign)) {
+            res.Status = ETicketStatus::SignBroken;
+            return res;
+        }
+        return res;
+    }
+
+    TParserTickets::TStrRes TParserTickets::ParseStrV3(TStringBuf body, TStringBuf type) {
+        TStringBuf forCheck = body;
+        TStringBuf version = body.NextTok(DELIM);
+        if (!body || version.size() != 1) {
+            return {ETicketStatus::Malformed, {}, {}, {}};
+        }
+        if (version != "3") {
+            return {ETicketStatus::UnsupportedVersion, {}, {}, {}};
+        }
+
+        TStringBuf ticketType = body.NextTok(DELIM);
+        if (ticketType != type) {
+            return {ETicketStatus::InvalidTicketType, {}, {}, {}};
+        }
+
+        TStringBuf proto = body.NextTok(DELIM);
+        TStringBuf sign = body.NextTok(DELIM);
+
+        if (!proto || !sign || body.size() > 0) {
+            return {ETicketStatus::Malformed, {}, {}, {}};
+        }
+
+        TString protoBin = NUtils::Base64url2bin(proto);
+        TString signBin = NUtils::Base64url2bin(sign);
+
+        if (!protoBin || !signBin) {
+            return {ETicketStatus::Malformed, {}, {}, {}};
+        }
+
+        return {ETicketStatus::Ok, std::move(protoBin), std::move(signBin), forCheck.Chop(sign.size())};
+    }
+}
diff --git a/library/cpp/tvmauth/src/parser.h b/library/cpp/tvmauth/src/parser.h
new file mode 100644
index 0000000000..678e709444
--- /dev/null
+++ b/library/cpp/tvmauth/src/parser.h
@@ -0,0 +1,51 @@
+#pragma once
+
+#include <library/cpp/tvmauth/src/protos/ticket2.pb.h>
+#include <library/cpp/tvmauth/src/rw/keys.h>
+
+#include <library/cpp/tvmauth/ticket_status.h>
+
+#include <util/generic/fwd.h>
+
+#include <string>
+
+namespace NTvmAuth {
+    struct TParserTvmKeys {
+        static inline const char DELIM = ':';
+        static TString ParseStrV1(TStringBuf str);
+    };
+
+    struct TParserTickets {
+        static const char DELIM = ':';
+
+        static TStringBuf UserFlag();
+        static TStringBuf ServiceFlag();
+
+        struct TRes {
+            TRes(ETicketStatus status)
+                : Status(status)
+            {
+            }
+
+            ETicketStatus Status;
+
+            ticket2::Ticket Ticket;
+        };
+        static TRes ParseV3(TStringBuf body, const NRw::TPublicKeys& keys, TStringBuf type);
+
+        // private:
+        struct TStrRes {
+            const ETicketStatus Status;
+
+            TString Proto;
+            TString Sign;
+
+            TStringBuf ForCheck;
+
+            bool operator==(const TStrRes& o) const { // for tests
+                return Status == o.Status && Proto == o.Proto && Sign == o.Sign && ForCheck == o.ForCheck;
+            }
+        };
+        static TStrRes ParseStrV3(TStringBuf body, TStringBuf type);
+    };
+}
diff --git a/library/cpp/tvmauth/src/protos/ticket2.proto b/library/cpp/tvmauth/src/protos/ticket2.proto
new file mode 100644
index 0000000000..66c00a7d01
--- /dev/null
+++ b/library/cpp/tvmauth/src/protos/ticket2.proto
@@ -0,0 +1,31 @@
+package ticket2;
+
+option go_package = "a.yandex-team.ru/library/cpp/tvmauth/src/protos";
+
+import "library/cpp/tvmauth/src/protos/tvm_keys.proto";
+
+message User {
+    required uint64 uid = 1;
+}
+
+message UserTicket {
+    repeated User users = 1;
+    required uint64 defaultUid = 2;
+    repeated string scopes = 3;
+    required uint32 entryPoint = 4;
+    required tvm_keys.BbEnvType env = 5;
+}
+
+message ServiceTicket {
+    required uint32 srcClientId = 1;
+    required uint32 dstClientId = 2;
+    repeated string scopes = 3;
+    optional uint64 issuerUid = 4;
+}
+
+message Ticket {
+    required uint32 keyId = 1;
+    required int64  expirationTime = 2;
+    optional UserTicket user = 3;
+    optional ServiceTicket service = 4;
+}
diff --git a/library/cpp/tvmauth/src/protos/tvm_keys.proto b/library/cpp/tvmauth/src/protos/tvm_keys.proto
new file mode 100644
index 0000000000..9ba42dbf80
--- /dev/null
+++ b/library/cpp/tvmauth/src/protos/tvm_keys.proto
@@ -0,0 +1,36 @@
+package tvm_keys;
+
+option go_package = "a.yandex-team.ru/library/cpp/tvmauth/src/protos";
+
+enum KeyType {
+    RabinWilliams = 0;
+}
+
+enum BbEnvType {
+   Prod = 0;
+   Test = 1;
+   ProdYateam = 2;
+   TestYateam = 3;
+   Stress = 4;
+}
+
+message General {
+    required uint32 id = 1;
+    required KeyType type = 2;
+    required bytes body = 3;
+    optional int64 createdTime = 4;
+}
+
+message BbKey {
+    required General gen = 1;
+    required BbEnvType env = 2;
+}
+
+message TvmKey {
+    required General gen = 1;
+}
+
+message Keys {
+    repeated BbKey bb = 1;
+    repeated TvmKey tvm = 2;
+}
diff --git a/library/cpp/tvmauth/src/rw/keys.cpp b/library/cpp/tvmauth/src/rw/keys.cpp
new file mode 100644
index 0000000000..5fba7b9232
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/keys.cpp
@@ -0,0 +1,138 @@
+#include "keys.h"
+
+#include "rw.h"
+
+#include <library/cpp/openssl/init/init.h>
+
+#include <openssl/evp.h>
+
+#include <util/generic/strbuf.h>
+#include <util/generic/yexception.h>
+
+namespace {
+    struct TInit {
+        TInit() {
+            InitOpenSSL();
+        }
+    } INIT;
+}
+
+namespace NTvmAuth {
+    namespace NRw {
+        namespace NPrivate {
+            void TRwDestroyer::Destroy(TRwInternal* o) {
+                RwFree(o);
+            }
+
+            class TArrayDestroyer {
+            public:
+                static void Destroy(unsigned char* o) {
+                    free(o);
+                }
+            };
+        }
+
+        static TString SerializeRW(TRwKey* rw, int (*func)(const TRwKey*, unsigned char**)) {
+            unsigned char* buf = nullptr;
+            int size = func(rw, &buf);
+            THolder<unsigned char, NPrivate::TArrayDestroyer> guard(buf);
+            return TString((char*)buf, size);
+        }
+
+        TKeyPair GenKeyPair(size_t size) {
+            TRw rw(RwNew());
+            RwGenerateKey(rw.Get(), size);
+
+            TRw skey(RwPrivateKeyDup(rw.Get()));
+            TRw vkey(RwPublicKeyDup(rw.Get()));
+
+            TKeyPair res;
+            res.Private = SerializeRW(skey.Get(), &i2d_RWPrivateKey);
+            res.Public = SerializeRW(vkey.Get(), &i2d_RWPublicKey);
+
+            TRwPrivateKey prKey(res.Private, 0);
+            TRwPublicKey pubKey(res.Public);
+
+            const TStringBuf msg = "Test test test test test";
+
+            Y_ENSURE(pubKey.CheckSign(msg, prKey.SignTicket(msg)), "Failed to gen keys");
+
+            return res;
+        }
+
+        TRwPrivateKey::TRwPrivateKey(TStringBuf body, TKeyId id)
+            : Id_(id)
+            , Rw_(Deserialize(body))
+            , SignLen_(RwModSize(Rw_.Get()))
+        {
+            Y_ENSURE(SignLen_ > 0, "Private key has bad len: " << SignLen_);
+        }
+
+        TKeyId TRwPrivateKey::GetId() const {
+            return Id_;
+        }
+
+        TString TRwPrivateKey::SignTicket(TStringBuf ticket) const {
+            TString res(SignLen_, 0x00);
+
+            int len = RwPssrSignMsg(ticket.size(),
+                                    (const unsigned char*)ticket.data(),
+                                    (unsigned char*)res.data(),
+                                    Rw_.Get(),
+                                    (EVP_MD*)EVP_sha256());
+
+            Y_ENSURE(len > 0 && len <= SignLen_, "Signing failed. len: " << len);
+
+            res.resize(len);
+            return res;
+        }
+
+        TRw TRwPrivateKey::Deserialize(TStringBuf key) {
+            TRwKey* rw = nullptr;
+            auto data = reinterpret_cast<const unsigned char*>(key.data());
+            if (!d2i_RWPrivateKey(&rw, &data, key.size())) {
+                ythrow yexception() << "Private key is malformed";
+            }
+            return TRw(rw);
+        }
+
+        TRwPublicKey::TRwPublicKey(TStringBuf body)
+            : Rw_(Deserialize(body))
+        {
+        }
+
+        bool TRwPublicKey::CheckSign(TStringBuf ticket, TStringBuf sign) const {
+            int result = RwPssrVerifyMsg(ticket.size(),
+                                         (const unsigned char*)ticket.data(),
+                                         (unsigned char*)sign.data(),
+                                         sign.size(),
+                                         Rw_.Get(),
+                                         (EVP_MD*)EVP_sha256());
+
+            Y_ENSURE(result >= 0, "Failed to check sign: " << result);
+            return result;
+        }
+
+        TRw TRwPublicKey::Deserialize(TStringBuf key) {
+            TRwKey* rw = nullptr;
+            auto data = reinterpret_cast<const unsigned char*>(key.data());
+            auto status = d2i_RWPublicKey(&rw, &data, key.size());
+
+            TRw res(rw);
+            Y_ENSURE(status, "Public key is malformed: " << key);
+            return res;
+        }
+
+        TSecureHeap::TSecureHeap(size_t totalSize, int minChunkSize) {
+            CRYPTO_secure_malloc_init(totalSize, minChunkSize);
+        }
+
+        TSecureHeap::~TSecureHeap() {
+            CRYPTO_secure_malloc_done();
+        }
+
+        void TSecureHeap::Init(size_t totalSize, int minChunkSize) {
+            Singleton<TSecureHeap>(totalSize, minChunkSize);
+        }
+    }
+}
diff --git a/library/cpp/tvmauth/src/rw/keys.h b/library/cpp/tvmauth/src/rw/keys.h
new file mode 100644
index 0000000000..e02b7e72a1
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/keys.h
@@ -0,0 +1,65 @@
+#pragma once
+
+#include <util/generic/ptr.h>
+#include <util/generic/string.h>
+
+#include <unordered_map>
+
+struct TRwInternal;
+
+namespace NTvmAuth {
+    namespace NRw {
+        namespace NPrivate {
+            class TRwDestroyer {
+            public:
+                static void Destroy(TRwInternal* o);
+            };
+        }
+
+        using TRw = THolder<TRwInternal, NPrivate::TRwDestroyer>;
+        using TKeyId = ui32;
+
+        struct TKeyPair {
+            TString Private;
+            TString Public;
+        };
+        TKeyPair GenKeyPair(size_t size);
+
+        class TRwPrivateKey {
+        public:
+            TRwPrivateKey(TStringBuf body, TKeyId id);
+
+            TKeyId GetId() const;
+            TString SignTicket(TStringBuf ticket) const;
+
+        private:
+            static TRw Deserialize(TStringBuf key);
+
+            TKeyId Id_;
+            TRw Rw_;
+            int SignLen_;
+        };
+
+        class TRwPublicKey {
+        public:
+            TRwPublicKey(TStringBuf body);
+
+            bool CheckSign(TStringBuf ticket, TStringBuf sign) const;
+
+        private:
+            static TRw Deserialize(TStringBuf key);
+
+            TRw Rw_;
+        };
+
+        using TPublicKeys = std::unordered_map<TKeyId, TRwPublicKey>;
+
+        class TSecureHeap {
+        public:
+            TSecureHeap(size_t totalSize, int minChunkSize);
+            ~TSecureHeap();
+
+            static void Init(size_t totalSize = 16 * 1024 * 1024, int minChunkSize = 16);
+        };
+    }
+}
diff --git a/library/cpp/tvmauth/src/rw/rw.h b/library/cpp/tvmauth/src/rw/rw.h
new file mode 100644
index 0000000000..aee49148eb
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/rw.h
@@ -0,0 +1,86 @@
+#pragma once
+
+#include <openssl/bn.h>
+#include <openssl/crypto.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    typedef struct {
+        BIGNUM* S;
+    } TRwSignature;
+
+    /*Rabin–Williams*/
+    typedef struct TRwInternal TRwKey;
+
+    typedef struct {
+        TRwSignature* (*RwSign)(const unsigned char* dgst, const int dlen, TRwKey* rw);
+        int (*RwVerify)(const unsigned char* dgst, int dgst_len, TRwSignature* sig, const TRwKey* rw);
+        int (*RwApply)(BIGNUM* r, BIGNUM* x, BN_CTX* ctx, const TRwKey* rw);
+    } TRwMethod;
+
+    struct TRwInternal {
+        /* first private multiplier */
+        BIGNUM* P;
+        /* second private multiplier */
+        BIGNUM* Q;
+        /* n = p*q - RW modulus */
+        BIGNUM* N;
+        /* precomputed 2^((3q-5)/8) mod q */
+        BIGNUM* Twomq;
+        /* precomputed 2^((9p-11)/8) mod p*/
+        BIGNUM* Twomp;
+        /* precomputed q^(p-2) == q^(-1) mod p */
+        BIGNUM* Iqmp;
+        /* (q+1) / 8 */
+        BIGNUM* Dq;
+        /* (p-3) / 8 */
+        BIGNUM* Dp;
+        /* functions for working with RW */
+        const TRwMethod* Meth;
+    };
+
+    TRwSignature* RwSignatureNew(void);
+    void RwSignatureFree(TRwSignature* a);
+
+    /* RW signing functions */
+    /* the function can put some tmp values to rw */
+    int RwPssrSignHash(const unsigned char* from, unsigned char* to, TRwKey* rw, const EVP_MD* md);
+    int RwPssrSignMsg(const int msgLen, const unsigned char* msg, unsigned char* to, TRwKey* rw, const EVP_MD* md);
+
+    /* RW-PSS verification functions */
+    int RwPssrVerifyHash(const unsigned char* from, const unsigned char* sig, const int sig_len, const TRwKey* rw, const EVP_MD* md);
+    int RwPssrVerifyMsg(const int msgLen, const unsigned char* msg, const unsigned char* sig, const int sig_len, const TRwKey* rw, const EVP_MD* md);
+
+    /* internal functions, use them only if you know what you're doing */
+    int RwNoPaddingSign(int flen, const unsigned char* from, unsigned char* to, TRwKey* rw);
+    int RwApply(const int flen, const unsigned char* from, unsigned char* to, const TRwKey* rw);
+
+    const TRwMethod* RwDefaultMethods(void);
+
+    TRwKey* RwNew(void);
+    void RwFree(TRwKey* r);
+    int RwSize(const TRwKey* rw);
+    int RwModSize(const TRwKey* rw);
+
+    TRwKey* RwPublicKeyDup(TRwKey* rw);
+    TRwKey* RwPrivateKeyDup(TRwKey* rw);
+
+    // NOLINTNEXTLINE(readability-identifier-naming)
+    TRwKey* d2i_RWPublicKey(TRwKey** a, const unsigned char** pp, long length);
+    // NOLINTNEXTLINE(readability-identifier-naming)
+    TRwKey* d2i_RWPrivateKey(TRwKey** a, const unsigned char** pp, long length);
+
+    int RwGenerateKey(TRwKey* a, int bits);
+    // NOLINTNEXTLINE(readability-identifier-naming)
+    int i2d_RWPublicKey(const TRwKey* a, unsigned char** pp);
+    // NOLINTNEXTLINE(readability-identifier-naming)
+    int i2d_RWPrivateKey(const TRwKey* a, unsigned char** pp);
+
+    int RwPaddingAddPssr(const TRwKey* rw, unsigned char* EM, const unsigned char* mHash, const EVP_MD* Hash, int sLen);
+    int RwVerifyPssr(const TRwKey* rw, const unsigned char* mHash, const EVP_MD* Hash, const unsigned char* EM, int sLen);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/library/cpp/tvmauth/src/rw/rw_asn1.c b/library/cpp/tvmauth/src/rw/rw_asn1.c
new file mode 100644
index 0000000000..f9dfe3996d
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/rw_asn1.c
@@ -0,0 +1,81 @@
+#include "rw.h"
+
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include <openssl/rand.h>
+
+#include <stdio.h>
+
+/* Override the default new methods */
+/* This callback is used by OpenSSL's ASN.1 parser */
+static int SignatureCallback(int operation, ASN1_VALUE** pval, const ASN1_ITEM* it, void* exarg) {
+    (void)it;
+    (void)exarg;
+
+    if (operation == ASN1_OP_NEW_PRE) {
+        TRwSignature* sig;
+        sig = OPENSSL_malloc(sizeof(TRwSignature));
+        if (!sig)
+            return 0;
+        sig->S = NULL;
+        *pval = (ASN1_VALUE*)sig;
+        return 2;
+    }
+    return 1;
+}
+
+/* ASN.1 structure representing RW signature value */
+ASN1_SEQUENCE_cb(TRwSignature, SignatureCallback) = {
+    ASN1_SIMPLE(TRwSignature, S, BIGNUM),
+} ASN1_SEQUENCE_END_cb(TRwSignature, TRwSignature)
+
+    /* i2d_ and d2i functions implementation for RW */
+    IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(TRwSignature, TRwSignature, TRwSignature)
+
+    /* Override the default free and new methods */
+    static int RwCallback(int operation, ASN1_VALUE** pval, const ASN1_ITEM* it, void* exarg) {
+    (void)it;
+    (void)exarg;
+
+    if (operation == ASN1_OP_NEW_PRE) {
+        *pval = (ASN1_VALUE*)RwNew();
+        if (*pval)
+            return 2;
+        return 0;
+    } else if (operation == ASN1_OP_FREE_PRE) {
+        RwFree((TRwKey*)*pval);
+        *pval = NULL;
+        return 2;
+    }
+    return 1;
+}
+
+/* ASN.1 representation of RW's private key */
+ASN1_SEQUENCE_cb(RWPrivateKey, RwCallback) = {
+    ASN1_SIMPLE(TRwKey, N, BIGNUM),
+    ASN1_SIMPLE(TRwKey, P, CBIGNUM),
+    ASN1_SIMPLE(TRwKey, Q, CBIGNUM),
+    ASN1_SIMPLE(TRwKey, Iqmp, CBIGNUM),
+    ASN1_SIMPLE(TRwKey, Dq, CBIGNUM),
+    ASN1_SIMPLE(TRwKey, Dp, CBIGNUM),
+    ASN1_SIMPLE(TRwKey, Twomp, CBIGNUM),
+    ASN1_SIMPLE(TRwKey, Twomq, CBIGNUM)} ASN1_SEQUENCE_END_cb(TRwKey, RWPrivateKey);
+
+/* i2d_ and d2i_ functions for RW's private key */
+IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(TRwKey, RWPrivateKey, RWPrivateKey);
+
+/* ASN.1 representation of RW public key */
+ASN1_SEQUENCE_cb(RWPublicKey, RwCallback) = {
+    ASN1_SIMPLE(TRwKey, N, BIGNUM),
+} ASN1_SEQUENCE_END_cb(TRwKey, RWPublicKey);
+
+/* i2d_ and d2i functions for RW public key */
+IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(TRwKey, RWPublicKey, RWPublicKey);
+
+TRwKey* RwPublicKeyDup(TRwKey* rw) {
+    return ASN1_item_dup(ASN1_ITEM_rptr(RWPublicKey), rw);
+}
+
+TRwKey* RwPrivateKeyDup(TRwKey* rw) {
+    return ASN1_item_dup(ASN1_ITEM_rptr(RWPrivateKey), rw);
+}
diff --git a/library/cpp/tvmauth/src/rw/rw_key.c b/library/cpp/tvmauth/src/rw/rw_key.c
new file mode 100644
index 0000000000..78baaf4dd9
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/rw_key.c
@@ -0,0 +1,135 @@
+#include "rw.h"
+
+#include <openssl/rand.h>
+
+int RwGenerateKey(TRwKey* rw, int bits) {
+    int ok = 0;
+
+    BN_CTX* ctx = NULL;
+    BIGNUM *rem3 = NULL, *rem7 = NULL, *mod8 = NULL, *rem5 = NULL;
+    BIGNUM *nmod = NULL, *twomqexp = NULL, *twompexp = NULL, *two = NULL;
+
+    int bitsp = (bits + 1) / 2;
+    int bitsq = bits - bitsp;
+
+    /* make sure that all components are not null */
+    if ((ctx = BN_CTX_secure_new()) == NULL)
+        goto err;
+    if (!rw)
+        goto err;
+    if (!rw->N && ((rw->N = BN_new()) == NULL))
+        goto err;
+    if (!rw->P && ((rw->P = BN_new()) == NULL))
+        goto err;
+    if (!rw->Q && ((rw->Q = BN_new()) == NULL))
+        goto err;
+    if (!rw->Iqmp && ((rw->Iqmp = BN_new()) == NULL))
+        goto err;
+    if (!rw->Twomq && ((rw->Twomq = BN_new()) == NULL))
+        goto err;
+    if (!rw->Twomp && ((rw->Twomp = BN_new()) == NULL))
+        goto err;
+    if (!rw->Dq && ((rw->Dq = BN_new()) == NULL))
+        goto err;
+    if (!rw->Dp && ((rw->Dp = BN_new()) == NULL))
+        goto err;
+
+    BN_CTX_start(ctx);
+
+    rem3 = BN_CTX_get(ctx);
+    rem7 = BN_CTX_get(ctx);
+    rem5 = BN_CTX_get(ctx);
+    mod8 = BN_CTX_get(ctx);
+    nmod = BN_CTX_get(ctx);
+    twomqexp = BN_CTX_get(ctx);
+    twompexp = BN_CTX_get(ctx);
+    two = BN_CTX_get(ctx);
+
+    if (!BN_set_word(mod8, 8))
+        goto err;
+    if (!BN_set_word(rem3, 3))
+        goto err;
+    if (!BN_set_word(rem7, 7))
+        goto err;
+    if (!BN_set_word(rem5, 5))
+        goto err;
+    if (!BN_set_word(two, 2))
+        goto err;
+
+    /* generate p */
+    /* add == 8 */
+    /* rem == 3 */
+    /* safe == 0 as we don't need (p-1)/2 to be also prime */
+    if (!BN_generate_prime_ex(rw->P, bitsp, 0, mod8, rem3, NULL))
+        goto err;
+
+    /* generate q */
+    /* add == 8 */
+    /* rem == 7 */
+    /* safe == 0 */
+    if (!BN_generate_prime_ex(rw->Q, bitsq, 0, mod8, rem7, NULL))
+        goto err;
+
+    /* n == p*q */
+    if (!BN_mul(rw->N, rw->P, rw->Q, ctx))
+        goto err;
+
+    /* n == 5 mod 8 ? */
+    if (!BN_nnmod(nmod, rw->N, mod8, ctx))
+        goto err;
+    if (BN_ucmp(rem5, nmod) != 0)
+        goto err;
+
+    /* q^(-1) mod p */
+    if (!BN_mod_inverse(rw->Iqmp, rw->Q, rw->P, ctx))
+        goto err;
+
+    /* twomqexp = (3q-5)/8 */
+    if (!BN_copy(twomqexp, rw->Q))
+        goto err;
+    if (!BN_mul_word(twomqexp, 3))
+        goto err;
+    if (!BN_sub_word(twomqexp, 5))
+        goto err;
+    if (!BN_rshift(twomqexp, twomqexp, 3))
+        goto err;
+    if (!BN_mod_exp(rw->Twomq, two, twomqexp, rw->Q, ctx))
+        goto err;
+
+    /* twompexp = (9p-11)/8 */
+    if (!BN_copy(twompexp, rw->P))
+        goto err;
+    if (!BN_mul_word(twompexp, 9))
+        goto err;
+    if (!BN_sub_word(twompexp, 11))
+        goto err;
+    if (!BN_rshift(twompexp, twompexp, 3))
+        goto err;
+    if (!BN_mod_exp(rw->Twomp, two, twompexp, rw->P, ctx))
+        goto err;
+
+    /* dp = (p-3) / 8 */
+    if (!BN_copy(rw->Dp, rw->P))
+        goto err;
+    if (!BN_sub_word(rw->Dp, 3))
+        goto err;
+    if (!BN_rshift(rw->Dp, rw->Dp, 3))
+        goto err;
+
+    /* dq = (q+1) / 8 */
+    if (!BN_copy(rw->Dq, rw->Q))
+        goto err;
+    if (!BN_add_word(rw->Dq, 1))
+        goto err;
+    if (!BN_rshift(rw->Dq, rw->Dq, 3))
+        goto err;
+
+    ok = 1;
+
+err:
+    if (ctx != NULL) {
+        BN_CTX_end(ctx);
+        BN_CTX_free(ctx);
+    }
+    return ok;
+}
diff --git a/library/cpp/tvmauth/src/rw/rw_lib.c b/library/cpp/tvmauth/src/rw/rw_lib.c
new file mode 100644
index 0000000000..afd73da38b
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/rw_lib.c
@@ -0,0 +1,77 @@
+#include "rw.h"
+
+#include <openssl/asn1.h>
+
+#include <stdio.h>
+
+TRwKey* RwNew(void) {
+    TRwKey* ret = NULL;
+
+    ret = (TRwKey*)malloc(sizeof(TRwKey));
+    if (ret == NULL) {
+        return (NULL);
+    }
+    ret->Meth = RwDefaultMethods();
+
+    ret->P = NULL;
+    ret->Q = NULL;
+    ret->N = NULL;
+    ret->Iqmp = NULL;
+    ret->Twomq = NULL;
+    ret->Twomp = NULL;
+    ret->Dp = NULL;
+    ret->Dq = NULL;
+
+    return ret;
+}
+
+void RwFree(TRwKey* r) {
+    if (r == NULL)
+        return;
+
+    if (r->P != NULL)
+        BN_clear_free(r->P);
+    if (r->Q != NULL)
+        BN_clear_free(r->Q);
+    if (r->N != NULL)
+        BN_clear_free(r->N);
+    if (r->Iqmp != NULL)
+        BN_clear_free(r->Iqmp);
+    if (r->Dp != NULL)
+        BN_clear_free(r->Dp);
+    if (r->Dq != NULL)
+        BN_clear_free(r->Dq);
+    if (r->Twomp != NULL)
+        BN_clear_free(r->Twomp);
+    if (r->Twomq != NULL)
+        BN_clear_free(r->Twomq);
+
+    free(r);
+}
+
+int RwSize(const TRwKey* r) {
+    int ret = 0, i = 0;
+    ASN1_INTEGER bs;
+    unsigned char buf[4]; /* 4 bytes looks really small.
+                             However, i2d_ASN1_INTEGER() will not look
+                             beyond the first byte, as long as the second
+                             parameter is NULL. */
+
+    i = BN_num_bits(r->N);
+    bs.length = (i + 7) / 8;
+    bs.data = buf;
+    bs.type = V_ASN1_INTEGER;
+    /* If the top bit is set the asn1 encoding is 1 larger. */
+    buf[0] = 0xff;
+
+    i = i2d_ASN1_INTEGER(&bs, NULL);
+
+    ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
+    return ret;
+}
+
+int RwModSize(const TRwKey* rw) {
+    if (rw == NULL || rw->N == NULL)
+        return 0;
+    return BN_num_bytes(rw->N);
+}
diff --git a/library/cpp/tvmauth/src/rw/rw_ossl.c b/library/cpp/tvmauth/src/rw/rw_ossl.c
new file mode 100644
index 0000000000..85bcb802e9
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/rw_ossl.c
@@ -0,0 +1,481 @@
+#include "rw.h"
+
+#include <openssl/rand.h>
+
+//#define RW_PRINT_DEBUG
+//#define AVOID_IF
+//#define FAULT_TOLERANCE_CHECK
+
+#ifdef RW_PRINT_DEBUG
+    #include <stdio.h>
+#endif
+
+static TRwSignature* RwDoSign(const unsigned char* dgst, int dlen, TRwKey* rw);
+static int RwDoVerify(const unsigned char* dgst, int dgst_len, TRwSignature* sig, const TRwKey* rw);
+static int RwDoApply(BIGNUM* r, BIGNUM* x, BN_CTX* ctx, const TRwKey* rw);
+
+static TRwMethod rw_default_meth = {
+    RwDoSign,
+    RwDoVerify,
+    RwDoApply};
+
+const TRwMethod* RwDefaultMethods(void) {
+    return &rw_default_meth;
+}
+
+#ifdef RW_PRINT_DEBUG
+
+static void print_bn(char* name, BIGNUM* value) {
+    char* str_repr;
+    str_repr = BN_bn2dec(value);
+    printf("Name: %s\n", name);
+    printf("Value: %s\n", str_repr);
+    OPENSSL_free(str_repr);
+}
+
+    #define DEBUG_PRINT_BN(s, x) \
+        do {                     \
+            print_bn((s), (x));  \
+        } while (0);
+    #define DEBUG_PRINT_RW(r)                        \
+        do {                                         \
+            DEBUG_PRINT_BN("rw->p", (r)->p);         \
+            DEBUG_PRINT_BN("rw->q", (r)->q);         \
+            DEBUG_PRINT_BN("rw->n", (r)->n);         \
+            DEBUG_PRINT_BN("rw->iqmp", (r)->iqmp);   \
+            DEBUG_PRINT_BN("rw->twomp", (r)->twomp); \
+            DEBUG_PRINT_BN("rw->twomq", (r)->twomq); \
+            DEBUG_PRINT_BN("rw->dp", (r)->dp);       \
+            DEBUG_PRINT_BN("rw->dq", (r)->dq);       \
+        } while (0);
+    #define DEBUG_PRINTF(s, v) \
+        do {                   \
+            printf((s), (v));  \
+        } while (0);
+#else
+    #define DEBUG_PRINT_BN(s, x)
+    #define DEBUG_PRINT_RW(r)
+    #define DEBUG_PRINTF(s, v)
+#endif
+
+/*
+ * The algorithms was taken from
+ * https://cr.yp.to/sigs/rwsota-20080131.pdf
+ * Section 6 -> "Avoiding Jacobi symbols"
+ * '^' means power
+ * 1. Compute U = h ^ ((q+1) / 8) mod q
+ * 2. If U ^ 4 - h mod q == 0, set e = 1 otherwise set e = -1
+ * 3. Compute V = (eh) ^ ((p-3)/8) mod p
+ * 4. If (V^4 * (eh)^2 - eh) mod p = 0; set f = 1; otherwise set f = 2
+ * 5. Precompute 2^((3q-5) / 8) mod q; Compute W = f^((3*q - 5) / 8) * U mod q
+ * 6. Precompute 2^((9p-11) / 8) mod p; Compute X = f^((9p-11) / 8) * V^3 * eh mod p
+ * 7. Precompute q^(p-2) mod p; Compute Y = W + q(q^(p-2) * (X - W) mod p)
+ * 8. Compute s = Y^2 mod pq
+ * 9. Fault tolerance: if efs^2 mod pq != h start over
+ */
+static TRwSignature* RwDoSign(const unsigned char* dgst, int dlen, TRwKey* rw) {
+    BIGNUM *m, *U, *V, *tmp, *m_q, *m_p, *tmp2;
+    /* additional variables to avoid "if" statements */
+    BIGNUM* tmp_mp;
+    TRwSignature* ret = NULL;
+    BN_CTX* ctx = NULL;
+    int ok = 0, e = 0, f = 0;
+
+#ifdef AVOID_IF
+    /* additional variables to avoid "if" statements */
+    BIGNUM *tmp_U, *tmp_V;
+#endif
+
+    if (!rw || !rw->P || !rw->Q || !rw->N || !rw->Iqmp || !rw->Dp || !rw->Dq || !rw->Twomp || !rw->Twomq)
+        goto err;
+
+    if ((ctx = BN_CTX_secure_new()) == NULL)
+        goto err;
+    BN_CTX_start(ctx);
+
+    m = BN_CTX_get(ctx);
+    U = BN_CTX_get(ctx);
+    V = BN_CTX_get(ctx);
+    tmp = BN_CTX_get(ctx);
+    tmp2 = BN_CTX_get(ctx);
+    m_q = BN_CTX_get(ctx);
+    m_p = BN_CTX_get(ctx);
+    tmp_mp = BN_CTX_get(ctx);
+
+#ifdef AVOID_IF
+    tmp_U = BN_CTX_get(ctx);
+    tmp_V = BN_CTX_get(ctx);
+#endif
+
+    DEBUG_PRINT_RW(rw)
+
+    /* if (!BN_set_word(four, 4)) goto err; */
+
+    if (!BN_bin2bn(dgst, dlen, m))
+        goto err;
+    if (BN_ucmp(m, rw->N) >= 0)
+        goto err;
+
+    /* check if m % 16 == 12 */
+    if (BN_mod_word(m, 16) != 12)
+        goto err;
+    DEBUG_PRINT_BN("m", m)
+
+    /* TODO: optimization to avoid memory allocation? */
+    if ((ret = RwSignatureNew()) == NULL)
+        goto err;
+    /* memory allocation */
+    if ((ret->S = BN_new()) == NULL)
+        goto err;
+
+    /* m_q = m mod q */
+    if (!BN_nnmod(m_q, m, rw->Q, ctx))
+        goto err;
+    /* m_p = m mod p */
+    if (!BN_nnmod(m_p, m, rw->P, ctx))
+        goto err;
+
+    DEBUG_PRINT_BN("m_p", m_p)
+    DEBUG_PRINT_BN("m_q", m_q)
+
+    /* U = h ** ((q+1)/8) mod q */
+    if (!BN_mod_exp(U, m_q, rw->Dq, rw->Q, ctx))
+        goto err;
+    DEBUG_PRINT_BN("U", U)
+
+    /* tmp = U^4 - h mod q */
+    if (!BN_mod_sqr(tmp, U, rw->Q, ctx))
+        goto err;
+    if (!BN_mod_sqr(tmp, tmp, rw->Q, ctx))
+        goto err;
+    DEBUG_PRINT_BN("U**4 mod q", tmp)
+
+    /* e = 1 if tmp == 0 else -1 */
+    e = 2 * (BN_ucmp(tmp, m_q) == 0) - 1;
+    DEBUG_PRINTF("e == %i\n", e)
+
+    /*
+     to avoid "if" branch
+     if e == -1: m_p = tmp_mp
+     if e ==  1: m_p = m_p
+     */
+    if (!BN_sub(tmp_mp, rw->P, m_p))
+        goto err;
+    m_p = (BIGNUM*)((1 - ((1 + e) >> 1)) * (BN_ULONG)tmp_mp + ((1 + e) >> 1) * (BN_ULONG)m_p);
+    DEBUG_PRINT_BN("eh mod p", m_p)
+
+    /* V = (eh) ** ((p-3)/8) */
+    if (!BN_mod_exp(V, m_p, rw->Dp, rw->P, ctx))
+        goto err;
+    DEBUG_PRINT_BN("V == ((eh) ** ((p-3)/8))", V)
+
+    /* (eh) ** 2 */
+    if (!BN_mod_sqr(tmp2, m_p, rw->P, ctx))
+        goto err;
+    DEBUG_PRINT_BN("(eh)**2", tmp2)
+
+    /* V ** 4 */
+    if (!BN_mod_sqr(tmp, V, rw->P, ctx))
+        goto err;
+    if (!BN_mod_sqr(tmp, tmp, rw->P, ctx))
+        goto err;
+    DEBUG_PRINT_BN("V**4", tmp)
+
+    /* V**4 * (eh)**2 */
+    if (!BN_mod_mul(tmp, tmp, tmp2, rw->P, ctx))
+        goto err;
+    DEBUG_PRINT_BN("tmp = (V**4 * (eh)**2) mod p", tmp)
+
+    /* tmp = tmp - eh mod p */
+    if (!BN_mod_sub(tmp, tmp, m_p, rw->P, ctx))
+        goto err;
+
+    /* f = 1 if zero else 2 */
+    f = 2 - BN_is_zero(tmp);
+    /* f = 2 - (constant_time_is_zero(BN_ucmp(tmp, m_p)) & 1); */
+    DEBUG_PRINTF("f == %i\n", f)
+
+#ifdef AVOID_IF
+    if (!BN_mod_mul(tmp_U, U, rw->twomq, rw->q, ctx))
+        goto err;
+
+    /*
+     to avoid "if" branch we use tiny additional computation
+     */
+    U = (BIGNUM*)((2 - f) * (BN_ULONG)U + (1 - (2 - f)) * (BN_ULONG)tmp_U);
+#else
+
+    if (f == 2) {
+        if (!BN_mod_mul(U, U, rw->Twomq, rw->Q, ctx))
+            goto err;
+    }
+
+#endif
+
+    DEBUG_PRINT_BN("W", U)
+
+    /* V ** 3 */
+    if (!BN_mod_sqr(tmp, V, rw->P, ctx))
+        goto err;
+    if (!BN_mod_mul(V, V, tmp, rw->P, ctx))
+        goto err;
+    DEBUG_PRINT_BN("V**3", V)
+
+    /* *(eh) */
+    if (!BN_mod_mul(V, V, m_p, rw->P, ctx))
+        goto err;
+    DEBUG_PRINT_BN("V**3 * (eh) mod p", V)
+
+#ifdef AVOID_IF
+
+    /* to avoid "if" statement we use simple computation */
+    if (!BN_mod_mul(tmp_V, V, rw->twomp, rw->p, ctx))
+        goto err;
+    V = (BIGNUM*)((2 - f) * (BN_ULONG)V + (1 - (2 - f)) * (BN_ULONG)tmp_V);
+
+#else
+
+    if (f == 2) {
+        if (!BN_mod_mul(V, V, rw->Twomp, rw->P, ctx))
+            goto err;
+    }
+
+#endif
+
+    DEBUG_PRINT_BN("X", V)
+
+    /* W = U, X = V */
+    if (!BN_mod_sub(V, V, U, rw->P, ctx))
+        goto err;
+    DEBUG_PRINT_BN("X - W mod p", V)
+
+    if (!BN_mod_mul(V, V, rw->Iqmp, rw->P, ctx))
+        goto err;
+    DEBUG_PRINT_BN("q**(p-2) * (X-W) mod p", V)
+
+    if (!BN_mul(V, V, rw->Q, ctx))
+        goto err;
+    DEBUG_PRINT_BN("q * prev mod p", V)
+
+    if (!BN_mod_add(V, U, V, rw->N, ctx))
+        goto err;
+    DEBUG_PRINT_BN("Y", V)
+
+    /* now V = Y */
+    if (!BN_mod_sqr(V, V, rw->N, ctx))
+        goto err;
+    DEBUG_PRINT_BN("s", V)
+
+#ifdef FAULT_TOLERANCE_CHECK
+
+    /* now V = s - principal square root */
+    /* fault tolerance check */
+    if (!BN_mod_sqr(tmp, V, rw->n, ctx))
+        goto err;
+    DEBUG_PRINT_BN("s**2", tmp)
+
+    if (!BN_mul_word(tmp, f))
+        goto err;
+    DEBUG_PRINT_BN("f * s**2", tmp)
+
+    if (!BN_nnmod(tmp, tmp, rw->n, ctx))
+        goto err;
+    DEBUG_PRINT_BN("s**2 * f mod n", tmp)
+
+    /* to avoid "if" statement */
+    if (!BN_sub(tmp2, rw->n, tmp))
+        goto err;
+    tmp = (BIGNUM*)(((1 + e) >> 1) * (BN_ULONG)tmp + (1 - ((1 + e) >> 1)) * (BN_ULONG)tmp2);
+    DEBUG_PRINT_BN("ef(s**2)", tmp)
+    DEBUG_PRINT_BN("(tmp == original m)", tmp)
+
+    if (BN_ucmp(tmp, m) != 0)
+        goto err;
+
+#endif
+
+    /* making the "principal square root" to be "|principal| square root" */
+    if (!BN_sub(tmp, rw->N, V))
+        goto err;
+
+    /* if tmp = MIN(V, rw->n - V) */
+    tmp = BN_ucmp(tmp, V) >= 0 ? V : tmp;
+
+    if (!BN_copy(ret->S, tmp))
+        goto err;
+
+    ok = 1;
+
+err:
+    if (ctx != NULL) {
+        BN_CTX_end(ctx);
+        BN_CTX_free(ctx);
+    }
+    if (!ok) {
+        RwSignatureFree(ret);
+        ret = NULL;
+    }
+
+    return ret;
+}
+
+static int RwDoVerify(const unsigned char* dgst, int dgst_len, TRwSignature* sig, const TRwKey* rw) {
+    BIGNUM *m = NULL, *x = NULL, *t1 = NULL, *t2 = NULL, *t1d = NULL, *t2d = NULL;
+    BN_CTX* ctx = NULL;
+    BN_ULONG rest1 = 0, rest2 = 0;
+    int retval = 0;
+
+    if (!rw || !rw->N || !sig || !sig->S)
+        goto err;
+
+    if ((ctx = BN_CTX_secure_new()) == NULL)
+        goto err;
+    BN_CTX_start(ctx);
+
+    m = BN_CTX_get(ctx);
+    t1 = BN_CTX_get(ctx);
+    t2 = BN_CTX_get(ctx);
+    t1d = BN_CTX_get(ctx);
+    t2d = BN_CTX_get(ctx);
+
+    if (!BN_bin2bn(dgst, dgst_len, m))
+        goto err;
+    /* dgst too big */
+    if (!BN_copy(t1, rw->N))
+        goto err;
+    if (!BN_sub_word(t1, 1))
+        goto err;
+    if (!BN_rshift(t1, t1, 1))
+        goto err;
+
+    /* check m and rw->n relation */
+    if (BN_ucmp(m, rw->N) >= 0)
+        goto err;
+    rest1 = BN_mod_word(m, 16);
+    if (rest1 != 12)
+        goto err;
+
+    if (BN_ucmp(t1, sig->S) < 0)
+        goto err;
+    if (BN_is_negative(sig->S))
+        goto err;
+
+    if (!BN_mod_sqr(t1, sig->S, rw->N, ctx))
+        goto err;
+    if (!BN_sub(t2, rw->N, t1))
+        goto err;
+    if (!BN_lshift1(t1d, t1))
+        goto err;
+    if (!BN_lshift1(t2d, t2))
+        goto err;
+
+    rest1 = BN_mod_word(t1, 16);
+    rest2 = BN_mod_word(t2, 16);
+
+    /* mod 16 */
+    if (rest1 == 12) {
+        x = t1;
+    }
+    /* mod 8 */
+    else if ((rest1 & 0x07) == 6) {
+        x = t1d;
+    }
+    /* mod 16 */
+    else if (rest2 == 12) {
+        x = t2;
+    }
+    /* mod 8 */
+    else if ((rest2 & 0x07) == 6) {
+        x = t2d;
+    } else
+        goto err;
+
+    DEBUG_PRINT_BN("m", m)
+    DEBUG_PRINT_BN("x", x)
+
+    /* check signature value */
+    retval = BN_ucmp(m, x) == 0;
+
+err:
+    if (ctx != NULL) {
+        BN_CTX_end(ctx);
+        BN_CTX_free(ctx);
+    }
+    return retval;
+}
+
+static int RwDoApply(BIGNUM* r, BIGNUM* x, BN_CTX* ctx, const TRwKey* rw) {
+    BIGNUM *t1 = NULL, *t2 = NULL, *t1d = NULL, *t2d = NULL, *rs = NULL;
+    BN_ULONG rest1 = 0, rest2 = 0;
+    int retval = 0;
+
+    if (!rw || !rw->N || !x || !ctx || !r)
+        goto err;
+
+    DEBUG_PRINT_BN("Signature = x = ", x)
+    DEBUG_PRINT_BN("n", rw->n)
+
+    BN_CTX_start(ctx);
+
+    t1 = BN_CTX_get(ctx);
+    t2 = BN_CTX_get(ctx);
+    t1d = BN_CTX_get(ctx);
+    t2d = BN_CTX_get(ctx);
+
+    if (!BN_copy(t1, rw->N))
+        goto err;
+    if (!BN_sub_word(t1, 1))
+        goto err;
+    if (!BN_rshift(t1, t1, 1))
+        goto err;
+
+    /* check m and rw->n relation */
+    if (BN_ucmp(x, rw->N) >= 0)
+        goto err;
+
+    if (BN_ucmp(t1, x) < 0)
+        goto err;
+    if (BN_is_negative(x))
+        goto err;
+
+    if (!BN_mod_sqr(t1, x, rw->N, ctx))
+        goto err;
+    DEBUG_PRINT_BN("x**2 mod n", t1)
+
+    if (!BN_sub(t2, rw->N, t1))
+        goto err;
+    DEBUG_PRINT_BN("n - x**2", t2)
+
+    if (!BN_lshift1(t1d, t1))
+        goto err;
+    if (!BN_lshift1(t2d, t2))
+        goto err;
+
+    rest1 = BN_mod_word(t1, 16);
+    rest2 = BN_mod_word(t2, 16);
+
+    /* mod 16 */
+    if (rest1 == 12) {
+        rs = t1;
+    }
+    /* mod 8 */
+    else if ((rest1 & 0x07) == 6) {
+        rs = t1d;
+    }
+    /* mod 16 */
+    else if (rest2 == 12) {
+        rs = t2;
+    }
+    /* mod 8 */
+    else if ((rest2 & 0x07) == 6) {
+        rs = t2d;
+    } else
+        goto err;
+
+    DEBUG_PRINT_BN("Squaring and shifting result (rs)", rs)
+    retval = BN_copy(r, rs) != NULL;
+
+err:
+    BN_CTX_end(ctx);
+    return retval;
+}
diff --git a/library/cpp/tvmauth/src/rw/rw_pss.c b/library/cpp/tvmauth/src/rw/rw_pss.c
new file mode 100644
index 0000000000..1e040a55eb
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/rw_pss.c
@@ -0,0 +1,328 @@
+/*
+ * This code was taken from the OpenSSL's RSA implementation
+ * and added to the RW project with some changes
+ *
+ * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2005.
+ *
+ */
+/* ====================================================================
+ * Copyright (c) 2005 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include "rw.h"
+
+#include <openssl/bn.h>
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+#include <openssl/sha.h>
+
+#include <stdio.h>
+#include <string.h>
+
+static const unsigned char zeroes[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
+
+static int PkcS1MgF1(unsigned char *mask, const int len, const unsigned char *seed, const int seedlen, const EVP_MD *dgst) {
+    int i, outlen = 0;
+    unsigned char cnt[4];
+    EVP_MD_CTX* c = EVP_MD_CTX_create();
+    unsigned char md[EVP_MAX_MD_SIZE];
+    int mdlen;
+    int rv = -1;
+
+    if (!c) {
+        return rv;
+    }
+
+    mdlen = EVP_MD_size(dgst);
+
+    if (mdlen < 0 || seedlen < 0)
+        goto err;
+
+    for (i = 0; outlen < len; i++) {
+        cnt[0] = (unsigned char)((i >> 24) & 255);
+        cnt[1] = (unsigned char)((i >> 16) & 255);
+        cnt[2] = (unsigned char)((i >> 8)) & 255;
+        cnt[3] = (unsigned char)(i & 255);
+
+        if (!EVP_DigestInit_ex(c,dgst, NULL) || !EVP_DigestUpdate(c, seed, seedlen) || !EVP_DigestUpdate(c, cnt, 4))
+            goto err;
+
+        if (outlen + mdlen <= len) {
+            if (!EVP_DigestFinal_ex(c, mask + outlen, NULL))
+                goto err;
+            outlen += mdlen;
+        } else {
+            if (!EVP_DigestFinal_ex(c, md, NULL))
+                goto err;
+            memcpy(mask + outlen, md, len - outlen);
+            outlen = len;
+        }
+    }
+    rv = 0;
+
+err:
+    EVP_MD_CTX_destroy(c);
+    return rv;
+}
+
+int RwVerifyPssr(const TRwKey *rw, const unsigned char *mHash, const EVP_MD *Hash, const unsigned char *EM, int sLen) {
+    int i = 0, ret = 0, hLen = 0, maskedDBLen = 0, MSBits = 0, emLen = 0;
+    const unsigned char *H = NULL;
+    unsigned char *DB = NULL;
+    EVP_MD_CTX* ctx = NULL;
+    unsigned char H_[EVP_MAX_MD_SIZE];
+    const EVP_MD *mgf1Hash = Hash;
+
+    ctx = EVP_MD_CTX_create();
+    if (!ctx) {
+        return ret;
+    }
+    hLen = EVP_MD_size(Hash);
+
+    if (hLen < 0)
+        goto err;
+    /*
+     * Negative sLen has special meanings:
+     *    -1    sLen == hLen
+     *    -2    salt length is autorecovered from signature
+     *    -N    reserved
+     */
+    if (sLen == -1)
+        sLen = hLen;
+    else if (sLen < -2)
+        goto err;
+
+    {
+        int bits = BN_num_bits(rw->N);
+        if (bits <= 0)
+            goto err;
+
+        MSBits = (bits - 1) & 0x7;
+    }
+    emLen = RwModSize(rw);
+
+    if (EM[0] & (0xFF << MSBits)) {
+        goto err;
+    }
+
+    if (MSBits == 0) {
+        EM++;
+        emLen--;
+    }
+
+    if (emLen < (hLen + sLen + 2)) /* sLen can be small negative */
+        goto err;
+
+    if (emLen < 1)
+        goto err;
+
+    if (EM[emLen - 1] != 0xbc)
+        goto err;
+
+    maskedDBLen = emLen - hLen - 1;
+    if (maskedDBLen <= 0)
+        goto err;
+
+    H = EM + maskedDBLen;
+    DB = malloc(maskedDBLen);
+
+    if (!DB)
+        goto err;
+
+    if (PkcS1MgF1(DB, maskedDBLen, H, hLen, mgf1Hash) < 0)
+        goto err;
+
+    for (i = 0; i < maskedDBLen; i++)
+        DB[i] ^= EM[i];
+
+    if (MSBits)
+        DB[0] &= 0xFF >> (8 - MSBits);
+
+    for (i = 0; DB[i] == 0 && i < (maskedDBLen-1); i++) ;
+
+    if (DB[i++] != 0x1)
+        goto err;
+
+    if (sLen >= 0 && (maskedDBLen - i) != sLen)
+        goto err;
+
+    if (!EVP_DigestInit_ex(ctx, Hash, NULL) || !EVP_DigestUpdate(ctx, zeroes, sizeof zeroes) || !EVP_DigestUpdate(ctx, mHash, hLen))
+        goto err;
+
+    if (maskedDBLen - i) {
+        if (!EVP_DigestUpdate(ctx, DB + i, maskedDBLen - i))
+            goto err;
+    }
+
+    if (!EVP_DigestFinal_ex(ctx, H_, NULL))
+        goto err;
+
+    ret = memcmp(H, H_, hLen) ? 0 : 1;
+
+err:
+    if (DB)
+        free(DB);
+
+    EVP_MD_CTX_destroy(ctx);
+
+    return ret;
+}
+
+/*
+ rw - public key
+ EM - buffer to write padding value
+ mHash - hash value
+ Hash - EVP_MD() that will be used to pad
+ sLen - random salt len (usually == hashLen)
+ */
+int RwPaddingAddPssr(const TRwKey *rw, unsigned char *EM, const unsigned char *mHash, const EVP_MD *Hash, int sLen) {
+    int i = 0, ret = 0, hLen = 0, maskedDBLen = 0, MSBits = 0, emLen = 0;
+    unsigned char *H = NULL, *salt = NULL, *p = NULL;
+    const EVP_MD *mgf1Hash = Hash;
+    EVP_MD_CTX* ctx = EVP_MD_CTX_create();
+    if (!ctx) {
+        return ret;
+    }
+
+    hLen = EVP_MD_size(Hash);
+    if (hLen < 0)
+        goto err;
+    /*
+     * Negative sLen has special meanings:
+     *    -1    sLen == hLen
+     *    -2    salt length is maximized
+     *    -N    reserved
+     */
+    if (sLen == -1)
+        sLen = hLen;
+    else if (sLen < -2)
+        goto err;
+
+    {
+        int bits = BN_num_bits(rw->N);
+        if (bits <= 0)
+            goto err;
+        MSBits = (bits - 1) & 0x7;
+    }
+    emLen = RwModSize(rw);
+    if (emLen <= 0)
+        goto err;
+
+    if (MSBits == 0) {
+        *EM++ = 0;
+        emLen--;
+        fprintf(stderr, "MSBits == 0\n");
+    }
+
+    if (sLen == -2) {
+        sLen = emLen - hLen - 2;
+    }
+    else if (emLen < (hLen + sLen + 2))
+        goto err;
+
+    if (sLen > 0) {
+        salt = malloc(sLen);
+        if (!salt) goto err;
+        if (RAND_bytes(salt, sLen) <= 0)
+            goto err;
+    }
+
+    maskedDBLen = emLen - hLen - 1;
+    if (maskedDBLen < 0)
+        goto err;
+    H = EM + maskedDBLen;
+
+    if (!EVP_DigestInit_ex(ctx, Hash, NULL) || !EVP_DigestUpdate(ctx, zeroes, sizeof zeroes) || !EVP_DigestUpdate(ctx, mHash, hLen))
+        goto err;
+
+    if (sLen && !EVP_DigestUpdate(ctx, salt, sLen))
+        goto err;
+
+    if (!EVP_DigestFinal_ex(ctx, H, NULL))
+        goto err;
+
+    /* Generate dbMask in place then perform XOR on it */
+    if (PkcS1MgF1(EM, maskedDBLen, H, hLen, mgf1Hash))
+        goto err;
+
+    p = EM;
+
+    /* Initial PS XORs with all zeroes which is a NOP so just update
+     * pointer. Note from a test above this value is guaranteed to
+     * be non-negative.
+     */
+    p += emLen - sLen - hLen - 2;
+    *p++ ^= 0x1;
+
+    if (sLen > 0) {
+        for (i = 0; i < sLen; i++)
+            *p++ ^= salt[i];
+    }
+
+    if (MSBits)
+        EM[0] &= 0xFF >> (8 - MSBits);
+
+    /* H is already in place so just set final 0xbc */
+    EM[emLen - 1] = 0xbc;
+
+    ret = 1;
+
+err:
+    EVP_MD_CTX_destroy(ctx);
+
+    if (salt)
+        free(salt);
+
+    return ret;
+}
diff --git a/library/cpp/tvmauth/src/rw/rw_pss_sign.c b/library/cpp/tvmauth/src/rw/rw_pss_sign.c
new file mode 100644
index 0000000000..683514ad6d
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/rw_pss_sign.c
@@ -0,0 +1,211 @@
+#include "rw.h"
+
+#include <openssl/evp.h>
+
+//#define DBG_FUZZING
+
+int RwApply(const int flen, const unsigned char* from, unsigned char* to, const TRwKey* rw) {
+    int i, j, num, k, r = -1;
+    BN_CTX* ctx = NULL;
+    BIGNUM *f = NULL, *ret = NULL;
+
+    if ((ctx = BN_CTX_secure_new()) == NULL)
+        goto err;
+    BN_CTX_start(ctx);
+
+    f = BN_CTX_get(ctx);
+    ret = BN_CTX_get(ctx);
+
+    num = BN_num_bytes(rw->N);
+
+    if (num <= 0)
+        goto err;
+
+    if (!f || !ret)
+        goto err;
+
+    if (BN_bin2bn(from, flen, f) == NULL)
+        goto err;
+    if (BN_ucmp(f, rw->N) >= 0)
+        goto err;
+
+    if (!rw->Meth->RwApply(ret, f, ctx, rw))
+        goto err;
+
+    j = BN_num_bytes(ret);
+    if (num < j || j < 0)
+        goto err;
+
+    i = BN_bn2bin(ret, to + num - j);
+    if (i < 0 || i > num)
+        goto err;
+
+    for (k = 0; k < (num - i); k++)
+        to[k] = 0;
+    r = num;
+
+err:
+    if (ctx != NULL) {
+        BN_CTX_end(ctx);
+        BN_CTX_free(ctx);
+    }
+    return r;
+}
+
+int RwPssrSignHash(const unsigned char* from, unsigned char* to, TRwKey* rw, const EVP_MD* md) {
+    unsigned char* padding = NULL;
+    int result = 0;
+
+    if (from == NULL || to == NULL || rw == NULL || md == NULL)
+        return 0;
+
+    int digest_size = EVP_MD_size(md);
+    int sig_size = RwModSize(rw);
+
+    if (digest_size <= 0 || sig_size <= 0)
+        return 0;
+
+    int tries = 50;
+    do {
+        if (padding != NULL) {
+            free(padding);
+#ifdef DBG_FUZZING
+            fprintf(stderr, "Padding regenerating required\n");
+#endif
+        }
+
+        padding = malloc(sig_size);
+        if (padding == NULL)
+            return 0;
+
+        if (!RwPaddingAddPssr(rw, padding, from, md, digest_size))
+            goto err;
+    } while (padding[0] == 0x00 && tries-- > 0);
+
+    result = RwNoPaddingSign(sig_size, padding, to, rw);
+
+err:
+    if (padding != NULL)
+        free(padding);
+
+    return result;
+}
+
+int RwPssrSignMsg(const int msgLen, const unsigned char* msg, unsigned char* to, TRwKey* rw, const EVP_MD* md) {
+    EVP_MD_CTX* mdctx = NULL;
+    unsigned char* digest = NULL;
+    unsigned int digestLen;
+    int result = 0;
+
+    if (msg == NULL || to == NULL || rw == NULL || md == NULL)
+        goto err;
+
+    if (rw->P == NULL || rw->Q == NULL)
+        goto err;
+
+    if ((mdctx = EVP_MD_CTX_create()) == NULL)
+        goto err;
+
+    if (1 != EVP_DigestInit_ex(mdctx, md, NULL))
+        goto err;
+
+    if (1 != EVP_DigestUpdate(mdctx, msg, msgLen))
+        goto err;
+
+    if ((digest = (unsigned char*)malloc(EVP_MD_size(md))) == NULL)
+        goto err;
+
+    if (1 != EVP_DigestFinal_ex(mdctx, digest, &digestLen))
+        goto err;
+
+    result = RwPssrSignHash(digest, to, rw, md);
+
+err:
+    if (mdctx != NULL)
+        EVP_MD_CTX_destroy(mdctx);
+    if (digest != NULL)
+        free(digest);
+
+    return result;
+}
+
+int RwPssrVerifyHash(const unsigned char* from, const unsigned char* sig, const int sig_len, const TRwKey* rw, const EVP_MD* md) {
+    unsigned char* buffer = NULL;
+    int buffer_len;
+    int salt_size;
+    int result = 0;
+
+    if (from == NULL || sig == NULL || rw == NULL || md == NULL)
+        return 0;
+
+    if (rw->N == NULL || rw->Meth == NULL)
+        return 0;
+
+    salt_size = EVP_MD_size(md);
+    if (salt_size <= 0)
+        return 0;
+
+    buffer_len = RwModSize(rw);
+    if (buffer_len <= 0)
+        return 0;
+
+    buffer = (unsigned char*)malloc(buffer_len);
+    if (buffer == NULL)
+        return 0;
+
+    if (RwApply(sig_len, sig, buffer, rw) <= 0)
+        goto err;
+
+    if (RwVerifyPssr(rw, from, md, buffer, salt_size) <= 0)
+        goto err;
+
+    result = 1;
+
+err:
+    if (buffer != NULL)
+        free(buffer);
+
+    return result;
+}
+
+int RwPssrVerifyMsg(const int msgLen, const unsigned char* msg, const unsigned char* sig, const int sig_len, const TRwKey* rw, const EVP_MD* md) {
+    EVP_MD_CTX* mdctx = NULL;
+    unsigned char* digest = NULL;
+    unsigned int digestLen = 0;
+    int result = 0;
+
+    if (msg == NULL || msgLen == 0 || sig == NULL || rw == NULL || md == NULL)
+        goto err;
+
+    if (rw->N == NULL)
+        goto err;
+
+    if ((mdctx = EVP_MD_CTX_create()) == NULL)
+        goto err;
+
+    if (1 != EVP_DigestInit_ex(mdctx, md, NULL))
+        goto err;
+
+    int size_to_alloc = EVP_MD_size(md);
+    if (size_to_alloc <= 0)
+        goto err;
+
+    if ((digest = (unsigned char*)malloc(size_to_alloc)) == NULL)
+        goto err;
+
+    if (1 != EVP_DigestUpdate(mdctx, msg, msgLen))
+        goto err;
+
+    if (1 != EVP_DigestFinal_ex(mdctx, digest, &digestLen))
+        goto err;
+
+    result = RwPssrVerifyHash(digest, sig, sig_len, rw, md);
+
+err:
+    if (mdctx != NULL)
+        EVP_MD_CTX_destroy(mdctx);
+    if (digest != NULL)
+        free(digest);
+
+    return result;
+}
diff --git a/library/cpp/tvmauth/src/rw/rw_sign.c b/library/cpp/tvmauth/src/rw/rw_sign.c
new file mode 100644
index 0000000000..e320808dd3
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/rw_sign.c
@@ -0,0 +1,46 @@
+#include "rw.h"
+
+TRwSignature* RwSignatureNew(void) {
+    TRwSignature* sig = NULL;
+    sig = malloc(sizeof(TRwSignature));
+    if (!sig)
+        return NULL;
+    sig->S = NULL;
+    return sig;
+}
+
+void RwSignatureFree(TRwSignature* sig) {
+    if (sig) {
+        if (sig->S)
+            BN_free(sig->S);
+        free(sig);
+    }
+}
+
+int RwNoPaddingSign(int flen, const unsigned char* from, unsigned char* to, TRwKey* rw) {
+    int i = 0, r = 0, num = -1;
+    TRwSignature* sig = NULL;
+
+    if (!rw || !rw->N || !rw->Meth || !rw->Meth->RwSign || !from || !to)
+        goto err;
+
+    if ((sig = rw->Meth->RwSign(from, flen, rw)) == NULL)
+        goto err;
+    num = BN_num_bytes(rw->N);
+
+    r = BN_bn2bin(sig->S, to);
+    if (r < 0)
+        goto err;
+
+    /* put zeroes to the rest of the 'to' buffer */
+    for (i = r; i < num; i++) {
+        to[i] = 0x00;
+    }
+
+err:
+    if (sig != NULL) {
+        RwSignatureFree(sig);
+    }
+
+    return r;
+}
diff --git a/library/cpp/tvmauth/src/rw/ut/rw_ut.cpp b/library/cpp/tvmauth/src/rw/ut/rw_ut.cpp
new file mode 100644
index 0000000000..9467d5d7c4
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/ut/rw_ut.cpp
@@ -0,0 +1,200 @@
+#include <library/cpp/tvmauth/src/rw/keys.h>
+#include <library/cpp/tvmauth/src/rw/rw.h>
+
+#include <library/cpp/string_utils/base64/base64.h>
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <openssl/bn.h>
+#include <openssl/evp.h>
+
+namespace NTvmAuth {
+    /*
+ returns 0 in case of error
+ */
+    int MakeKeysRw(TRwKey** skey, TRwKey** vkey) {
+        int result = 0;
+
+        TRwKey* rw = RwNew();
+
+        do {
+            RwGenerateKey(rw, 2048);
+
+            if (rw == nullptr) {
+                printf("RwGenerateKey failed\n");
+                break; /* failed */
+            }
+
+            printf("RW key bits: %d\n", BN_num_bits(rw->N));
+
+            /* Set signing key */
+            *skey = RwPrivateKeyDup(rw);
+            if (*skey == nullptr) {
+                printf("RwPrivateKeyDup failed\n");
+                break;
+            }
+
+            /* Set verifier key */
+            *vkey = RwPublicKeyDup(rw);
+            if (*vkey == nullptr) {
+                printf("RwPublicKeyDup failed\n");
+                break;
+            }
+
+            result = 1;
+
+        } while (0);
+
+        if (rw) {
+            RwFree(rw);
+            rw = nullptr;
+        }
+
+        return result;
+    }
+
+    static void PrintIt(const char* label, const unsigned char* buff, size_t len) {
+        if (!buff || !len)
+            return;
+
+        if (label)
+            printf("%s: ", label);
+
+        for (size_t i = 0; i < len; ++i)
+            printf("%02X", buff[i]);
+
+        printf("\n");
+    }
+
+    int TestSignVerify() {
+        TRwKey *skey = nullptr, *vkey = nullptr;
+        const char* msg = "Test test test test test";
+        unsigned int msg_len = 0;
+        int res = 0;
+
+        msg_len = (unsigned int)strlen(msg);
+        if (MakeKeysRw(&skey, &vkey)) {
+            unsigned char* sign = new unsigned char[RwModSize(skey) + 10];
+            int sign_len;
+            printf("RwModSize(skey) returned %d\n", RwModSize(skey));
+            memset(sign, 0x00, RwModSize(skey) + 10);
+
+            printf("--- Signing call ---\n");
+            if ((sign_len = RwPssrSignMsg(msg_len, (unsigned char*)msg, sign, skey, (EVP_MD*)EVP_sha256())) != 0) {
+#ifdef RW_PRINT_DEBUG
+                BIGNUM* s = BN_new();
+#endif
+                printf("\n");
+                PrintIt("Signature", sign, RwModSize(skey));
+
+#ifdef RW_PRINT_DEBUG
+                BN_bin2bn(sign, RW_mod_size(skey), s);
+
+                print_bn("Signature BN", s);
+
+                BN_free(s);
+#endif
+
+                printf("--- Verification call ---\n");
+                if (RwPssrVerifyMsg(msg_len, (unsigned char*)msg, sign, sign_len, vkey, (EVP_MD*)EVP_sha256())) {
+                    printf("Verification: success!\n");
+                    res = 1;
+                } else {
+                    printf("Verification: failed!\n");
+                    printf("RwPssrVerifyMsg failed!\n");
+                    return 1;
+                }
+            } else {
+                printf("RwPssrSignMsg failed!\n");
+                return 1;
+            }
+
+            if (sign != nullptr)
+                delete[] sign;
+
+        } else {
+            printf("MakeKeysRw failed!\n");
+            return 1;
+        }
+
+        if (skey != nullptr) {
+            RwFree(skey);
+        }
+        if (vkey != nullptr)
+            RwFree(vkey);
+
+        return res;
+    }
+}
+
+using namespace NTvmAuth;
+Y_UNIT_TEST_SUITE(Rw) {
+    Y_UNIT_TEST(SignVerify) {
+        for (int i = 1; i < 10; ++i) {
+            UNIT_ASSERT_VALUES_EQUAL(1, TestSignVerify());
+        }
+    }
+
+    Y_UNIT_TEST(TKeysPriv) {
+        NRw::TRwPrivateKey priv(Base64Decode("MIIEmwKCAQBwsRd4frsVARIVSfj_vCdfvA3Q9SsGhSybdBDhbm8L6rPqxdoSNLCdNXzDWj7Ppf0o8uWHMxC-5Lfw0I18ri68nhm9-ndixcnbn6ti1uetgkc28eiEP6Q8ILD_JmkynbUl1aKDNAa5XsK2vFSEX402uydRomsTn46kRY23hfqcIi0ohh5VxIrpclRsRZus0JFu-RJzhqTbKYV4y4dglWPGHh5BuTv9k_Oh0_Ra8Xp5Rith5vjaKZUQ5Hyh9UtBYTkNWdvXP9OpmbiLVeRLuMzBm4HEFHDwMZ1h6LSVP-wB_spJPaMLTn3Q3JIHe-wGBYRWzU51RRYDqv4O_H12w5C1AoGBALAwCQ7fdAPG1lGclL7iWFjUofwPCFwPyDjicDT_MRRu6_Ta4GjqOGO9zuOp0o_ePgvR-7nA0fbaspM4LZNrPZwmoYBCJMtKXetg68ylu2DO-RRSN2SSh1AIZSA_8UTABk69bPzNL31j4PyZWxrgZ3zP9uZvzggveuKt5ZhCMoB7AoGBAKO9oC2AZjLdh2RaEFotTL_dY6lVcm38VA6PnigB8gB_TMuSrd4xtRw5BxvHpOCnBcUAJE0dN4_DDe5mrotKYMD2_3_lcq9PaLZadrPDCSDL89wtoVxNQNAJTqFjBFXYNu4Ze63lrsqg45TF5XmVRemyBHzXw3erd0pJaeoUDaSPAoGAJhGoHx_nVw8sDoLzeRkOJ1_6-uh_wVmVr6407_LPjrrySEq-GiYu43M3-QDp8J_J9e3S1Rpm4nQX2bEf5Gx9n4wKz7Hp0cwkOqBOWhvrAu6YLpv59wslEtkx0LYcJy6yQk5mpU8l29rPO7b50NyLnfnE2za-9DyK038FKlr5VgICgYAUd7QFsAzGW7Dsi0ILRamX-6x1Kq5Nv4qB0fPFAD5AD-mZclW7xjajhyDjePScFOC4oASJo6bx-GG9zNXRaUwYHt_v_K5V6e0Wy07WeGEkGX57hbQriagaASnULGCKuwbdwy91vLXZVBxymLyvMqi9NkCPmvhu9W7pSS09QoG0kgKBgBYGASHb7oB42sozkpfcSwsalD-B4QuB-QccTgaf5iKN3X6bXA0dRwx3udx1OlH7x8F6P3c4Gj7bVlJnBbJtZ7OE1DAIRJlpS71sHXmUt2wZ3yKKRuySUOoBDKQH_iiYAMnXrZ-Zpe-sfB-TK2NcDO-Z_tzN-cEF71xVvLMIRlAPAoGAdeikZPh1O57RxnVY72asiMRZheMBhK-9uSNPyYEZv3bUnIjg4XdMYStF2yTHNu014XvkDSQTe-drv2BDs9ExKplM4xFOtDtPQQ3mMB3GoK1qVhM_9n1QEElreurMicahkalnPo6tU4Z6PFL7PTpjRnCN67lJp0J0fxNDL13YSagCgYBA9VJrMtPjzcAx5ZCIYJjrYUPqEG_ttQN2RJIHN3MVpdpLAMIgX3tnlfyLwQFVKK45D1JgFa_1HHcxTWGtdIX4nsIjPWt-cWCCCkkw9rM5_Iqcb-YLSood6IP2OK0w0XLD1STnFRy_BRwdjPbGOYmp6YrJDZAlajDkFSdRvsz9Vg=="),
+                                0);
+        NRw::TRwPrivateKey priv2(Base64Decode("MIIEnAKCAQEA4RATOfumLD1n6ICrW5biaAl9VldinczmkNPjpUWwc3gs8PnkCrtdnPFmpBwW3gjHdSNU1OuEg5A6K1o1xiGv9sU-jd88zQBOdK6E2zwnJnkK6bNusKE2H2CLqg3aMWCmTa9JbzSy1uO7wa-xCqqNUuCko-2lyv12HhL1ICIH951SHDa4qO1U5xZhhlUAnqWi9R4tYDeMiF41WdOjwT2fg8UkbusThmxa3yjCXjD7OyjshPtukN8Tl3UyGtV_s2CLnE3f28VAi-AVW8FtgL22xbGhuyEplXRrtF1E5oV7NSqxH1FS0SYROA8ffYQGV5tfx5WDFHiXDEP6BzoVfeBDRQKBgQDzidelKZNFMWar_yj-r_cniMkZXNaNVEQbMg1A401blGjkU1r-ufGH5mkdNx4IgEoCEYBTM834Z88fYV1lOVfdT0OqtiVoC9NkLu3xhQ1r9_r6RMaAenwsV7leH8jWMOKvhkB0KNI49oznTGDqLp0AbDbtP66xdNH4dr3rw3WFywKBgQDslDdv4sdnRKN27h2drhn4Pp_Lgw2U-6MfHiyjp6BKR8Qtlld3hdb-ZjU9F0h38DqECmFIEe35_flKfd7X21CBQs9EuKR8EdaF3OAgzA-TRWeQhyHmaV7Fas1RlNqZHm8lckaZT8dX9Ygsxn0I_vUbm9pkFivwGvQnnwNQ7Te5LwKBgCVMYOzLHW911l6EbCZE6XU2HUrTKEd1bdqWCgtxPEmDl3BZcXpnyKpqSHmlH1F7s65WBfejxDM2hjin3OnXSog_x35ql_-Azu93-79QAzbQc6Z13BuWPpQxV8iw4ijqRRhzjD2pcvXlIxgebp5-H0eDt-Md2Y8rkrzyhm8EH7mwAoGAHZKG7fxY7OiUbt3Ds7XDPwfT-XBhsp90Y-PFlHT0CUj4hbLK7vC638zGp6LpDv4HUIFMKQI9vz-_KU-72vtqEChZ6JcUj4I60LucBBmB8mis8hDkPM0r2K1ZqjKbUyPN5K5I0yn46v6xBZjPoR_eo3N7TILFfgNehPPgah2m9yYCgYAecTr0pTJopizVf-Uf1f7k8RkjK5rRqoiDZkGoHGmrco0cimtf1z4w_M0jpuPBEAlAQjAKZnm_DPnj7Cuspyr7qeh1VsStAXpshd2-MKGtfv9fSJjQD0-Fivcrw_kaxhxV8MgOhRpHHtGc6YwdRdOgDYbdp_XWLpo_Dte9eG6wuQKBgDzo0e8d8pTyvCP23825rVzvrSHBZkliGkCEu0iggDnfKOreejFhQN9JeBo8sYdQFCRBptEU6k4b5O6J3NQ1Sspiez15ddqmFMD4uhJY6VsV-JFnL9YhLqVd355xZCyU4b07mReU9-LuqK2m2chjxH_HDAgUoEvO_yzR9EDYqHbNAoGAf529Ah9HIT5aG6IGTlwQdk-M7guy63U4vj4uC7z98qgvFEsV6cr4miT6RE8Aw5yAeN5pW59rZNjBNr9i-8n8kouasho2xNMTPKP8YuSNg2PNNS5T1Ou56mgsBCY5i10TIHKNIm2RVSUgzJ97BMEOZY6jQRytFfwgYkvnFzbuA9c="),
+                                 0);
+        NRw::TRwPrivateKey priv3(Base64Decode("MIICVAKBgF9t2YJGAJkRRFq6fWhi3m1TFW1UOE0f6ZrfYhHAkpqGlKlh0QVfeTNPpeJhi75xXzCe6oReRUm-0DbqDNhTShC7uGUv1INYnRBQWH6E-5Fc5XrbDFSuGQw2EYjNfHy_HefHJXxQKAqPvxBDKMKkHgV58WtM6rC8jRi9sdX_ig2NAkEAg1xBDL_UkHy347HwioMscJFP-6eKeim3LoG9rd1EvOycxkoStZ4299OdyzzEXC9cjLdq401BXe-LairiMUgZawJBALn5ziBCc2ycMaYjZDon2EN55jBEe0tJdUy4mOi0ozTV9OLcBANds0nMYPjZFOY3QymzU0LcOa_An3JknI0C2ucCQGxtwTb3h7ux5Ld8jkeRYzkNoB2Y6Is5fqCYVRIJZmz0IcQFb2iW0EX92U7_BpgVuKlvSDTP9LuaxuPfmY6WXEECQBc_OcQITm2ThjTEbIdE-whvPMYIj2lpLqmXEx0WlGaavpxbgIBrtmk5jB8bIpzG6GU2amhbhzX4E-5Mk5GgW10CQBBriCGX-pIPlvx2PhFQZY4SKf908U9FNuXQN7W7qJedk5jJQlazxt76c7lnmIuF65GW7VxpqCu98W1FXEYpAy0CQG-lpihdvxaZ8SkHqNFZGnXhELT2YesLs7GehZSTwuUwx1iTpVm88PVROLYBDZqoGM316s9aZEJBALe5zEpxQTQCQQCDMszX1cQlbBCP08isuMQ2ac3S-qNd0mfRXDCRfMm4s7iuJ5MeHU3uPUVlA_MR4ULRbg1d97TGio912z4KPgjE"),
+                                 0);
+
+        UNIT_ASSERT_EXCEPTION(NRw::TRwPrivateKey("asdzxcv", 0), yexception);
+        UNIT_ASSERT_EXCEPTION(NRw::TRwPrivateKey(Base64Decode("AKBgF9t2YJGAJkRRFq6fWhi3m1TFW1UOE0f6ZrfYhHAkpqGlKlh0QVfeTNPpeJhi75xXzCe6oReRUm-0DbqDNhTShC7uGUv1INYnRBQWH6E-5Fc5XrbDFSuGQw2EYjNfHy_HefHJXxQKAqPvxBDKMKkHgV58WtM6rC8jRi9sdX_ig2NAkEAg1xBDL_UkHy347HwioMscJFP-6eKeim3LoG9rd1EvOycxkoStZ4299OdyzzEXC9cjLdq401BXe-LairiMUgZawJBALn5ziBCc2ycMaYjZDon2EN55jBEe0tJdUy4mOi0ozTV9OLcBANds0nMYPjZFOY3QymzU0LcOa_An3JknI0C2ucCQGxtwTb3h7ux5Ld8jkeRYzkNoB2Y6Is5fqCYVRIJZmz0IcQFb2iW0EX92U7_BpgVuKlvSDTP9LuaxuPfmY6WXEECQBc_OcQITm2ThjTEbIdE-whvPMYIj2lpLqmXEx0WlGaavpxbgIBrtmk5jB8bIpzG6GU2amhbhzX4E-5Mk5GgW10CQBBriCGX-pIPlvx2PhFQZY4SKf908U9FNuXQN7W7qJedk5jJQlazxt76c7lnmIuF65GW7VxpqCu98W1FXEYpAy0CQG-lpihdvxaZ8SkHqNFZGnXhELT2YesLs7GehZSTwuUwx1iTpVm88PVROLYBDZqoGM316s9aZEJBALe5zEpxQTQCQQCDMszX1cQlbBCP08isuMQ2ac3S-qNd0mfRXDCRfMm4s7iuJ5MeHU3uPUVlA_MR4ULRbg1d97TGio912z4KP"),
+                                                 0),
+                              yexception);
+
+        UNIT_ASSERT(!priv.SignTicket("").empty());
+    }
+
+    Y_UNIT_TEST(TKeysPub) {
+        NRw::TRwPublicKey pub(Base64Decode("MIIBBAKCAQBwsRd4frsVARIVSfj_vCdfvA3Q9SsGhSybdBDhbm8L6rPqxdoSNLCdNXzDWj7Ppf0o8uWHMxC-5Lfw0I18ri68nhm9-ndixcnbn6ti1uetgkc28eiEP6Q8ILD_JmkynbUl1aKDNAa5XsK2vFSEX402uydRomsTn46kRY23hfqcIi0ohh5VxIrpclRsRZus0JFu-RJzhqTbKYV4y4dglWPGHh5BuTv9k_Oh0_Ra8Xp5Rith5vjaKZUQ5Hyh9UtBYTkNWdvXP9OpmbiLVeRLuMzBm4HEFHDwMZ1h6LSVP-wB_spJPaMLTn3Q3JIHe-wGBYRWzU51RRYDqv4O_H12w5C1"));
+        NRw::TRwPublicKey pub2(Base64Decode("MIIBBQKCAQEA4RATOfumLD1n6ICrW5biaAl9VldinczmkNPjpUWwc3gs8PnkCrtdnPFmpBwW3gjHdSNU1OuEg5A6K1o1xiGv9sU-jd88zQBOdK6E2zwnJnkK6bNusKE2H2CLqg3aMWCmTa9JbzSy1uO7wa-xCqqNUuCko-2lyv12HhL1ICIH951SHDa4qO1U5xZhhlUAnqWi9R4tYDeMiF41WdOjwT2fg8UkbusThmxa3yjCXjD7OyjshPtukN8Tl3UyGtV_s2CLnE3f28VAi-AVW8FtgL22xbGhuyEplXRrtF1E5oV7NSqxH1FS0SYROA8ffYQGV5tfx5WDFHiXDEP6BzoVfeBDRQ=="));
+        NRw::TRwPublicKey pub3(Base64Decode("MIGDAoGAX23ZgkYAmRFEWrp9aGLebVMVbVQ4TR_pmt9iEcCSmoaUqWHRBV95M0-l4mGLvnFfMJ7qhF5FSb7QNuoM2FNKELu4ZS_Ug1idEFBYfoT7kVzletsMVK4ZDDYRiM18fL8d58clfFAoCo-_EEMowqQeBXnxa0zqsLyNGL2x1f-KDY0="));
+
+        UNIT_ASSERT_EXCEPTION(NRw::TRwPublicKey("asdzxcv"), yexception);
+        UNIT_ASSERT_EXCEPTION(NRw::TRwPublicKey(Base64Decode("AoGAX23ZgkYAmRFEWrp9aGLebVMVbVQ4TR_pmt9iEcCSmoaUqWHRBV95M0-l4mGLvnFfMJ7qhF5FSb7QNuoM2FNKELu4ZS_Ug1idEFBYfoT7kVzletsMVK40")), yexception);
+
+        UNIT_ASSERT(!pub.CheckSign("~~~", "~~~"));
+    }
+
+    Y_UNIT_TEST(TKeys) {
+        NRw::TRwPrivateKey priv(Base64Decode("MIIEmwKCAQBwsRd4frsVARIVSfj_vCdfvA3Q9SsGhSybdBDhbm8L6rPqxdoSNLCdNXzDWj7Ppf0o8uWHMxC-5Lfw0I18ri68nhm9-ndixcnbn6ti1uetgkc28eiEP6Q8ILD_JmkynbUl1aKDNAa5XsK2vFSEX402uydRomsTn46kRY23hfqcIi0ohh5VxIrpclRsRZus0JFu-RJzhqTbKYV4y4dglWPGHh5BuTv9k_Oh0_Ra8Xp5Rith5vjaKZUQ5Hyh9UtBYTkNWdvXP9OpmbiLVeRLuMzBm4HEFHDwMZ1h6LSVP-wB_spJPaMLTn3Q3JIHe-wGBYRWzU51RRYDqv4O_H12w5C1AoGBALAwCQ7fdAPG1lGclL7iWFjUofwPCFwPyDjicDT_MRRu6_Ta4GjqOGO9zuOp0o_ePgvR-7nA0fbaspM4LZNrPZwmoYBCJMtKXetg68ylu2DO-RRSN2SSh1AIZSA_8UTABk69bPzNL31j4PyZWxrgZ3zP9uZvzggveuKt5ZhCMoB7AoGBAKO9oC2AZjLdh2RaEFotTL_dY6lVcm38VA6PnigB8gB_TMuSrd4xtRw5BxvHpOCnBcUAJE0dN4_DDe5mrotKYMD2_3_lcq9PaLZadrPDCSDL89wtoVxNQNAJTqFjBFXYNu4Ze63lrsqg45TF5XmVRemyBHzXw3erd0pJaeoUDaSPAoGAJhGoHx_nVw8sDoLzeRkOJ1_6-uh_wVmVr6407_LPjrrySEq-GiYu43M3-QDp8J_J9e3S1Rpm4nQX2bEf5Gx9n4wKz7Hp0cwkOqBOWhvrAu6YLpv59wslEtkx0LYcJy6yQk5mpU8l29rPO7b50NyLnfnE2za-9DyK038FKlr5VgICgYAUd7QFsAzGW7Dsi0ILRamX-6x1Kq5Nv4qB0fPFAD5AD-mZclW7xjajhyDjePScFOC4oASJo6bx-GG9zNXRaUwYHt_v_K5V6e0Wy07WeGEkGX57hbQriagaASnULGCKuwbdwy91vLXZVBxymLyvMqi9NkCPmvhu9W7pSS09QoG0kgKBgBYGASHb7oB42sozkpfcSwsalD-B4QuB-QccTgaf5iKN3X6bXA0dRwx3udx1OlH7x8F6P3c4Gj7bVlJnBbJtZ7OE1DAIRJlpS71sHXmUt2wZ3yKKRuySUOoBDKQH_iiYAMnXrZ-Zpe-sfB-TK2NcDO-Z_tzN-cEF71xVvLMIRlAPAoGAdeikZPh1O57RxnVY72asiMRZheMBhK-9uSNPyYEZv3bUnIjg4XdMYStF2yTHNu014XvkDSQTe-drv2BDs9ExKplM4xFOtDtPQQ3mMB3GoK1qVhM_9n1QEElreurMicahkalnPo6tU4Z6PFL7PTpjRnCN67lJp0J0fxNDL13YSagCgYBA9VJrMtPjzcAx5ZCIYJjrYUPqEG_ttQN2RJIHN3MVpdpLAMIgX3tnlfyLwQFVKK45D1JgFa_1HHcxTWGtdIX4nsIjPWt-cWCCCkkw9rM5_Iqcb-YLSood6IP2OK0w0XLD1STnFRy_BRwdjPbGOYmp6YrJDZAlajDkFSdRvsz9Vg=="),
+                                0);
+        NRw::TRwPublicKey pub(Base64Decode("MIIBBAKCAQBwsRd4frsVARIVSfj_vCdfvA3Q9SsGhSybdBDhbm8L6rPqxdoSNLCdNXzDWj7Ppf0o8uWHMxC-5Lfw0I18ri68nhm9-ndixcnbn6ti1uetgkc28eiEP6Q8ILD_JmkynbUl1aKDNAa5XsK2vFSEX402uydRomsTn46kRY23hfqcIi0ohh5VxIrpclRsRZus0JFu-RJzhqTbKYV4y4dglWPGHh5BuTv9k_Oh0_Ra8Xp5Rith5vjaKZUQ5Hyh9UtBYTkNWdvXP9OpmbiLVeRLuMzBm4HEFHDwMZ1h6LSVP-wB_spJPaMLTn3Q3JIHe-wGBYRWzU51RRYDqv4O_H12w5C1"));
+
+        const TString data = "my magic data";
+
+        UNIT_ASSERT(pub.CheckSign(data, priv.SignTicket(data)));
+        UNIT_ASSERT(!pub.CheckSign("~~~~" + data, priv.SignTicket(data)));
+        UNIT_ASSERT(!pub.CheckSign(data, "~~~~" + priv.SignTicket(data)));
+
+        UNIT_ASSERT(pub.CheckSign(data,
+                                  Base64Decode("EC5hZunmK3hOJZeov_XlNIXcwj5EsgX94lMd-tQJTNUO4NR6bCO7qQkKjEeFJmI2QFYXGY-iSf9WeMJ_brECAMyYAix-L8sZqcMPXD945QgkPsNQKyC0DX9FkgfSh6ZKkA-UvFSHrkn3QbeE9omk3-yXpqR-M8DlVqmp3mwdYlYRq0NdfTaD3AMXVA4aZTbW3OmhJoLJ8AxJ3w1oG5q_lk8dpW9vvqfIzsfPABme6sY5XyPmsjYaRDf9z4ZJgR-wTkG06_N_YzIklS5T2s_4FUKLz5gLMhsnVlNUpgZyRN9sXTAn9-zMJnCwAC8WRgykWnljPGDDJCjk-Xwsg7AOLQ==")));
+        UNIT_ASSERT(pub.CheckSign(data,
+                                  Base64Decode("JbHSn1QEQeOEvzyt-LpawbQv4vPEEE05bWhjB2-MkoV-tyq9FykSqGqhP3ZFc1_FPrqguwEYrHibI2l5w3q8wnI1fcyRUoNuJxmBSzf2f_Uzn9ZoUSc7D9pTGSvK_hhZoL4YMc_VfbdEdnDuvHZNlZyaDPH9EbmUqyXjnXTEwRoK0fAU1rhlHvSZvnp0ctVBWSkaQsaU8dJTKDBtIQVP1D5Py2pKB2NBF_Ytz2thWt7iLjbTyjtis6DC-JKwjFBqv6nQf42sKalHQqWFuIvBCIfNUswEw4_sGfwWVSBBmFplf7FmD7sN8znUahYUPGCe1uFNly6WwpPJsm8VtiU80g==")));
+        UNIT_ASSERT(pub.CheckSign(data,
+                                  Base64Decode("FeMZtDP-yuoNqK2HYw3JxTV9v7p8IoQEuRMtuHddafh4bq1ZOeEqg7g7Su6M3iq_kN9DZ_fVhuhuVcbZmNYPIvJ8oL5DE80KI3d1Qbs9mS8_X4Oq2TJpZgNfFG-z_LPRZSNRP9Q8sQhlAoSZHOSZkBFcYj1EuqEp6nSSSbX8Ji4Se-TfhIh3YFQkr-Ivk_3NmSXhDXUaW7CHo2rVm58QJ2cgSEuxzBH-Q8E8tGDCEmk4p3_iot9XY8RRN-_j0yi15etmXCUIKFbpDogtHdT8CyAEVHMYvsLqkLux9pzy3RdvNQmoPjol3wIm-H0wMtF_pMw4G2QLNev6he6xWeckxw==")));
+    }
+
+    Y_UNIT_TEST(Keygen) {
+        for (size_t idx = 0; idx < 100; ++idx) {
+            NRw::TKeyPair pair = NRw::GenKeyPair(1024);
+            NRw::TRwPrivateKey priv(pair.Private, 0);
+            NRw::TRwPublicKey pub(pair.Public);
+
+            const TString data = "my magic data";
+            TStringStream s;
+            s << "data='" << data << "'.";
+            s << "private='" << Base64Encode(pair.Private) << "'.";
+            s << "public='" << Base64Encode(pair.Public) << "'.";
+            TString sign;
+            UNIT_ASSERT_NO_EXCEPTION_C(sign = priv.SignTicket(data), s.Str());
+            s << "sign='" << Base64Encode(sign) << "'.";
+            UNIT_ASSERT_C(pub.CheckSign(data, sign), s.Str());
+        }
+    }
+}
diff --git a/library/cpp/tvmauth/src/rw/ut_large/gen/main.cpp b/library/cpp/tvmauth/src/rw/ut_large/gen/main.cpp
new file mode 100644
index 0000000000..31a599c996
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/ut_large/gen/main.cpp
@@ -0,0 +1,32 @@
+#include <library/cpp/tvmauth/src/rw/keys.h>
+
+#include <library/cpp/string_utils/base64/base64.h>
+
+#include <util/generic/yexception.h>
+
+using namespace NTvmAuth;
+
+const TString DATA = "my magic data";
+
+int main(int, char**) {
+    const NRw::TKeyPair pair = NRw::GenKeyPair(1024);
+    const NRw::TRwPrivateKey priv(pair.Private, 0);
+    const NRw::TRwPublicKey pub(pair.Public);
+
+    Cout << "data='" << DATA << "'."
+         << "private='" << Base64Encode(pair.Private) << "'."
+         << "public='" << Base64Encode(pair.Public) << "'.";
+
+    TString sign;
+    try {
+        sign = priv.SignTicket(DATA);
+        Cout << "sign='" << Base64Encode(sign) << "'.";
+        Y_ENSURE(pub.CheckSign(DATA, sign));
+    } catch (const std::exception& e) {
+        Cout << "what='" << e.what() << "'" << Endl;
+        return 1;
+    }
+    Cout << Endl;
+
+    return 0;
+}
diff --git a/library/cpp/tvmauth/src/rw/ut_large/test.py b/library/cpp/tvmauth/src/rw/ut_large/test.py
new file mode 100644
index 0000000000..0cf95d9848
--- /dev/null
+++ b/library/cpp/tvmauth/src/rw/ut_large/test.py
@@ -0,0 +1,35 @@
+from __future__ import print_function
+
+import os
+import subprocess
+import sys
+
+import yatest.common as yc
+
+
+def test_fuzzing():
+    errfile = './errfile'
+    outfile = './outfile'
+    env = os.environ.copy()
+
+    for number in range(25000):
+        with open(errfile, 'w') as fe:
+            with open(outfile, 'w') as fo:
+                p = subprocess.Popen(
+                    [
+                        yc.build_path('library/cpp/tvmauth/src/rw/ut_large/gen/gen'),
+                    ],
+                    env=env,
+                    stdout=fo,
+                    stderr=fe,
+                )
+                code = p.wait()
+
+        with open(errfile) as fe:
+            all = fe.read()
+            if all != '':
+                with open(outfile) as fo:
+                    print(fo.read(), file=sys.stderr)
+                assert all == ''
+
+        assert code == 0
diff --git a/library/cpp/tvmauth/src/service_impl.cpp b/library/cpp/tvmauth/src/service_impl.cpp
new file mode 100644
index 0000000000..463b5d634c
--- /dev/null
+++ b/library/cpp/tvmauth/src/service_impl.cpp
@@ -0,0 +1,204 @@
+#include "service_impl.h"
+
+#include "parser.h"
+#include "utils.h"
+
+#include <library/cpp/tvmauth/exception.h>
+#include <library/cpp/tvmauth/ticket_status.h>
+
+#include <util/generic/strbuf.h>
+#include <util/string/cast.h>
+#include <util/string/split.h>
+
+namespace NTvmAuth {
+    static const char* EX_MSG = "Method cannot be used in non-valid ticket";
+
+    TCheckedServiceTicket::TImpl::operator bool() const {
+        return (Status_ == ETicketStatus::Ok);
+    }
+
+    TTvmId TCheckedServiceTicket::TImpl::GetDst() const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        return ProtobufTicket_.service().dstclientid();
+    }
+
+    TTvmId TCheckedServiceTicket::TImpl::GetSrc() const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        return ProtobufTicket_.service().srcclientid();
+    }
+
+    const TScopes& TCheckedServiceTicket::TImpl::GetScopes() const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        if (CachedScopes_.empty()) {
+            for (const auto& el : ProtobufTicket_.service().scopes()) {
+                CachedScopes_.push_back(el);
+            }
+        }
+        return CachedScopes_;
+    }
+
+    bool TCheckedServiceTicket::TImpl::HasScope(TStringBuf scopeName) const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        return std::binary_search(ProtobufTicket_.service().scopes().begin(), ProtobufTicket_.service().scopes().end(), scopeName);
+    }
+
+    ETicketStatus TCheckedServiceTicket::TImpl::GetStatus() const {
+        return Status_;
+    }
+
+    time_t TCheckedServiceTicket::TImpl::GetExpirationTime() const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        return ProtobufTicket_.expirationtime();
+    }
+
+    TString TCheckedServiceTicket::TImpl::DebugInfo() const {
+        if (CachedDebugInfo_) {
+            return CachedDebugInfo_;
+        }
+
+        if (Status_ == ETicketStatus::Malformed) {
+            CachedDebugInfo_ = "status=malformed;";
+            return CachedDebugInfo_;
+        }
+
+        TString targetString = "ticket_type=";
+        targetString.reserve(256);
+        if (Status_ == ETicketStatus::InvalidTicketType) {
+            targetString.append("not-serv;");
+            CachedDebugInfo_ = targetString;
+            return targetString;
+        }
+
+        targetString.append("serv");
+        if (ProtobufTicket_.has_expirationtime())
+            targetString.append(";expiration_time=").append(IntToString<10>(ProtobufTicket_.expirationtime()));
+        if (ProtobufTicket_.service().has_srcclientid()) {
+            targetString.append(";src=").append(IntToString<10>(ProtobufTicket_.service().srcclientid()));
+        }
+        if (ProtobufTicket_.service().has_dstclientid()) {
+            targetString.append(";dst=").append(IntToString<10>(ProtobufTicket_.service().dstclientid()));
+        }
+        for (const auto& scope : ProtobufTicket_.service().scopes()) {
+            targetString.append(";scope=").append(scope);
+        }
+        if (ProtobufTicket_.service().has_issueruid()) {
+            targetString.append(";issuer_uid=").append(IntToString<10>(ProtobufTicket_.service().GetissuerUid()));
+        }
+        targetString.append(";");
+
+        CachedDebugInfo_ = targetString;
+        return targetString;
+    }
+
+    TMaybe<TUid> TCheckedServiceTicket::TImpl::GetIssuerUid() const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        return ProtobufTicket_.service().has_issueruid()
+                   ? ProtobufTicket_.service().GetissuerUid()
+                   : TMaybe<TUid>();
+    }
+
+    void TCheckedServiceTicket::TImpl::SetStatus(ETicketStatus status) {
+        Status_ = status;
+    }
+
+    TCheckedServiceTicket::TImpl::TImpl(ETicketStatus status, ticket2::Ticket&& protobufTicket)
+        : Status_(status)
+        , ProtobufTicket_(std::move(protobufTicket))
+    {
+    }
+
+    TServiceTicketImplPtr TCheckedServiceTicket::TImpl::CreateTicketForTests(ETicketStatus status,
+                                                                             TTvmId src,
+                                                                             TMaybe<TUid> issuerUid) {
+        ticket2::Ticket proto;
+        proto.mutable_service()->set_srcclientid(src);
+        proto.mutable_service()->set_dstclientid(100500);
+        if (issuerUid) {
+            proto.mutable_service()->set_issueruid(*issuerUid);
+        }
+        return MakeHolder<TImpl>(status, std::move(proto));
+    }
+
+    TServiceContext::TImpl::TImpl(TStringBuf secretBase64, TTvmId selfTvmId, TStringBuf tvmKeysResponse)
+        : Secret_(ParseSecret(secretBase64))
+        , SelfTvmId_(selfTvmId)
+    {
+        ResetKeys(tvmKeysResponse);
+    }
+
+    TServiceContext::TImpl::TImpl(TTvmId selfTvmId, TStringBuf tvmKeysResponse)
+        : SelfTvmId_(selfTvmId)
+    {
+        ResetKeys(tvmKeysResponse);
+    }
+
+    TServiceContext::TImpl::TImpl(TStringBuf secretBase64)
+        : Secret_(ParseSecret(secretBase64))
+    {
+    }
+
+    void TServiceContext::TImpl::ResetKeys(TStringBuf tvmKeysResponse) {
+        tvm_keys::Keys protoKeys;
+        if (!protoKeys.ParseFromString(TParserTvmKeys::ParseStrV1(tvmKeysResponse))) {
+            ythrow TMalformedTvmKeysException() << "Malformed TVM keys";
+        }
+
+        NRw::TPublicKeys keys;
+        for (int idx = 0; idx < protoKeys.tvm_size(); ++idx) {
+            const tvm_keys::TvmKey& k = protoKeys.tvm(idx);
+            keys.emplace(k.gen().id(),
+                         k.gen().body());
+        }
+
+        if (keys.empty()) {
+            ythrow TEmptyTvmKeysException() << "Empty TVM keys";
+        }
+
+        Keys_ = std::move(keys);
+    }
+
+    TServiceTicketImplPtr TServiceContext::TImpl::Check(TStringBuf ticketBody, const TServiceContext::TCheckFlags& flags) const {
+        Y_ENSURE_EX(!Keys_.empty(), TEmptyTvmKeysException() << "Empty TVM keys");
+
+        TParserTickets::TRes res = TParserTickets::ParseV3(ticketBody, Keys_, TParserTickets::ServiceFlag());
+
+        if (res.Status != ETicketStatus::Ok) {
+            return MakeHolder<TCheckedServiceTicket::TImpl>(res.Status, std::move(res.Ticket));
+        }
+
+        if (!res.Ticket.has_service()) {
+            return MakeHolder<TCheckedServiceTicket::TImpl>(ETicketStatus::Malformed, std::move(res.Ticket));
+        }
+
+        if (flags.NeedDstCheck && SelfTvmId_ != res.Ticket.service().dstclientid()) {
+            return MakeHolder<TCheckedServiceTicket::TImpl>(ETicketStatus::InvalidDst, std::move(res.Ticket));
+        }
+
+        return MakeHolder<TCheckedServiceTicket::TImpl>(ETicketStatus::Ok, std::move(res.Ticket));
+    }
+
+    TString TServiceContext::TImpl::SignCgiParamsForTvm(TStringBuf ts, TStringBuf dst, TStringBuf scopes) const {
+        if (Secret_.Value().empty()) {
+            ythrow TMalformedTvmSecretException() << "Malformed TVM secret: it is empty";
+        }
+        return NUtils::SignCgiParamsForTvm(Secret_, ts, dst, scopes);
+    }
+
+    TString TServiceContext::TImpl::ParseSecret(TStringBuf secretBase64) {
+        while (secretBase64 && secretBase64.back() == '\n') {
+            secretBase64.Chop(1);
+        }
+
+        if (secretBase64.empty()) {
+            ythrow TMalformedTvmSecretException() << "Malformed TVM secret: it is empty";
+        }
+
+        const TString secret = NUtils::Base64url2bin(secretBase64);
+        if (secret.empty()) {
+            ythrow TMalformedTvmSecretException() << "Malformed TVM secret: invalid base64url";
+        }
+
+        return secret;
+    }
+
+}
diff --git a/library/cpp/tvmauth/src/service_impl.h b/library/cpp/tvmauth/src/service_impl.h
new file mode 100644
index 0000000000..26202f283e
--- /dev/null
+++ b/library/cpp/tvmauth/src/service_impl.h
@@ -0,0 +1,77 @@
+#pragma once
+
+#include <library/cpp/tvmauth/src/protos/ticket2.pb.h>
+#include <library/cpp/tvmauth/src/protos/tvm_keys.pb.h>
+#include <library/cpp/tvmauth/src/rw/keys.h>
+
+#include <library/cpp/tvmauth/type.h>
+#include <library/cpp/tvmauth/deprecated/service_context.h>
+
+#include <library/cpp/charset/ci_string.h>
+#include <library/cpp/string_utils/secret_string/secret_string.h>
+
+#include <util/generic/maybe.h>
+
+#include <string>
+
+namespace NTvmAuth {
+    using TServiceTicketImplPtr = THolder<TCheckedServiceTicket::TImpl>;
+    class TCheckedServiceTicket::TImpl {
+    public:
+        explicit operator bool() const;
+
+        TTvmId GetDst() const;
+        TTvmId GetSrc() const;
+        const TScopes& GetScopes() const;
+        bool HasScope(TStringBuf scopeName) const;
+        ETicketStatus GetStatus() const;
+        time_t GetExpirationTime() const;
+
+        TString DebugInfo() const;
+        TMaybe<TUid> GetIssuerUid() const;
+
+        void SetStatus(ETicketStatus status);
+
+        /*!
+         * Constructor for creation invalid ticket storing error status in TServiceContext
+         * @param status
+         * @param protobufTicket
+         */
+        TImpl(ETicketStatus status, ticket2::Ticket&& protobufTicket);
+
+        static TServiceTicketImplPtr CreateTicketForTests(ETicketStatus status,
+                                                          TTvmId src,
+                                                          TMaybe<TUid> issuerUid);
+
+    private:
+        ETicketStatus Status_;
+        ticket2::Ticket ProtobufTicket_;
+        mutable TScopes CachedScopes_;
+        mutable TString CachedDebugInfo_;
+    };
+
+    class TServiceContext::TImpl {
+    public:
+        TImpl(TStringBuf secretBase64, TTvmId selfTvmId, TStringBuf tvmKeysResponse);
+        TImpl(TTvmId selfTvmId, TStringBuf tvmKeysResponse);
+        TImpl(TStringBuf secretBase64);
+
+        void ResetKeys(TStringBuf tvmKeysResponse);
+
+        TServiceTicketImplPtr Check(TStringBuf ticketBody, const TServiceContext::TCheckFlags& flags = {}) const;
+        TString SignCgiParamsForTvm(TStringBuf ts, TStringBuf dst, TStringBuf scopes = TStringBuf()) const;
+
+        const NRw::TPublicKeys& GetKeys() const { // for tests
+            return Keys_;
+        }
+
+    private:
+        static TString ParseSecret(TStringBuf secretBase64);
+
+        NRw::TPublicKeys Keys_;
+        const NSecretString::TSecretString Secret_;
+        const TTvmId SelfTvmId_ = 0;
+
+        ::google::protobuf::LogSilencer LogSilencer_;
+    };
+}
diff --git a/library/cpp/tvmauth/src/service_ticket.cpp b/library/cpp/tvmauth/src/service_ticket.cpp
new file mode 100644
index 0000000000..9716836cf5
--- /dev/null
+++ b/library/cpp/tvmauth/src/service_ticket.cpp
@@ -0,0 +1,46 @@
+#include "service_impl.h"
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+
+namespace NTvmAuth {
+    static const char* EX_MSG = "Ticket already moved out";
+
+    TCheckedServiceTicket::TCheckedServiceTicket(THolder<TImpl> impl)
+        : Impl_(std::move(impl))
+    {
+    }
+
+    TCheckedServiceTicket::TCheckedServiceTicket(TCheckedServiceTicket&& o) = default;
+    TCheckedServiceTicket& TCheckedServiceTicket::operator=(TCheckedServiceTicket&& o) = default;
+    TCheckedServiceTicket::~TCheckedServiceTicket() = default;
+
+    TCheckedServiceTicket::operator bool() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->operator bool();
+    }
+
+    TTvmId TCheckedServiceTicket::GetDst() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->GetDst();
+    }
+
+    TTvmId TCheckedServiceTicket::GetSrc() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->GetSrc();
+    }
+
+    ETicketStatus TCheckedServiceTicket::GetStatus() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->GetStatus();
+    }
+
+    TString TCheckedServiceTicket::DebugInfo() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->DebugInfo();
+    }
+
+    TMaybe<TUid> TCheckedServiceTicket::GetIssuerUid() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->GetIssuerUid();
+    }
+}
diff --git a/library/cpp/tvmauth/src/status.cpp b/library/cpp/tvmauth/src/status.cpp
new file mode 100644
index 0000000000..1b08fc098f
--- /dev/null
+++ b/library/cpp/tvmauth/src/status.cpp
@@ -0,0 +1,32 @@
+#include <library/cpp/tvmauth/ticket_status.h>
+
+#include <util/generic/yexception.h>
+
+namespace NTvmAuth {
+    TStringBuf StatusToString(ETicketStatus st) {
+        switch (st) {
+            case ETicketStatus::Ok:
+                return "OK";
+            case ETicketStatus::Expired:
+                return "Expired ticket";
+            case ETicketStatus::InvalidBlackboxEnv:
+                return "Invalid BlackBox environment";
+            case ETicketStatus::InvalidDst:
+                return "Invalid ticket destination";
+            case ETicketStatus::InvalidTicketType:
+                return "Invalid ticket type";
+            case ETicketStatus::Malformed:
+                return "Malformed ticket";
+            case ETicketStatus::MissingKey:
+                return "Context does not have required key to check ticket: public keys are too old";
+            case ETicketStatus::SignBroken:
+                return "Invalid ticket signature";
+            case ETicketStatus::UnsupportedVersion:
+                return "Unsupported ticket version";
+            case ETicketStatus::NoRoles:
+                return "Subject (src or defaultUid) does not have any roles in IDM";
+        }
+
+        ythrow yexception() << "Unexpected status: " << static_cast<int>(st);
+    }
+}
diff --git a/library/cpp/tvmauth/src/unittest.cpp b/library/cpp/tvmauth/src/unittest.cpp
new file mode 100644
index 0000000000..5133d79ea9
--- /dev/null
+++ b/library/cpp/tvmauth/src/unittest.cpp
@@ -0,0 +1,14 @@
+#include "service_impl.h"
+#include "user_impl.h"
+
+#include <library/cpp/tvmauth/unittest.h>
+
+namespace NTvmAuth::NUnittest {
+    TCheckedServiceTicket CreateServiceTicket(ETicketStatus status, TTvmId src, TMaybe<TUid> issuerUid) {
+        return TCheckedServiceTicket(TCheckedServiceTicket::TImpl::CreateTicketForTests(status, src, issuerUid));
+    }
+
+    TCheckedUserTicket CreateUserTicket(ETicketStatus status, TUid defaultUid, const TScopes& scopes, const TUids& uids, EBlackboxEnv env) {
+        return TCheckedUserTicket(TCheckedUserTicket::TImpl::CreateTicketForTests(status, defaultUid, scopes, uids, env));
+    }
+}
diff --git a/library/cpp/tvmauth/src/user_impl.cpp b/library/cpp/tvmauth/src/user_impl.cpp
new file mode 100644
index 0000000000..4fda799aac
--- /dev/null
+++ b/library/cpp/tvmauth/src/user_impl.cpp
@@ -0,0 +1,241 @@
+#include "user_impl.h"
+
+#include "parser.h"
+
+#include <library/cpp/tvmauth/exception.h>
+#include <library/cpp/tvmauth/ticket_status.h>
+
+#include <util/generic/strbuf.h>
+#include <util/string/cast.h>
+#include <util/string/split.h>
+
+#include <algorithm>
+
+namespace NTvmAuth {
+    static const char* EX_MSG = "Method cannot be used in non-valid ticket";
+
+    TStringBuf GetBlackboxEnvAsString(EBlackboxEnv environment) {
+        switch (environment) {
+            case (EBlackboxEnv::Prod):
+                return TStringBuf("Prod");
+            case (EBlackboxEnv::Test):
+                return TStringBuf("Test");
+            case (EBlackboxEnv::ProdYateam):
+                return TStringBuf("ProdYateam");
+            case (EBlackboxEnv::TestYateam):
+                return TStringBuf("TestYateam");
+            case (EBlackboxEnv::Stress):
+                return TStringBuf("Stress");
+            default:
+                throw yexception() << "Unknown environment";
+        }
+    }
+
+    TCheckedUserTicket::TImpl::operator bool() const {
+        return (Status_ == ETicketStatus::Ok);
+    }
+
+    TUid TCheckedUserTicket::TImpl::GetDefaultUid() const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        return ProtobufTicket_.user().defaultuid();
+    }
+
+    time_t TCheckedUserTicket::TImpl::GetExpirationTime() const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        return ProtobufTicket_.expirationtime();
+    }
+
+    const TScopes& TCheckedUserTicket::TImpl::GetScopes() const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        if (CachedScopes_.empty()) {
+            for (const auto& el : ProtobufTicket_.user().scopes()) {
+                CachedScopes_.push_back(el);
+            }
+        }
+        return CachedScopes_;
+    }
+
+    bool TCheckedUserTicket::TImpl::HasScope(TStringBuf scopeName) const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        return std::binary_search(ProtobufTicket_.user().scopes().begin(), ProtobufTicket_.user().scopes().end(), scopeName);
+    }
+
+    ETicketStatus TCheckedUserTicket::TImpl::GetStatus() const {
+        return Status_;
+    }
+
+    const TUids& TCheckedUserTicket::TImpl::GetUids() const {
+        Y_ENSURE_EX(bool(*this), TNotAllowedException() << EX_MSG);
+        if (CachedUids_.empty()) {
+            for (const auto& user : ProtobufTicket_.user().users()) {
+                CachedUids_.push_back(user.uid());
+            }
+        }
+        return CachedUids_;
+    }
+
+    TString TCheckedUserTicket::TImpl::DebugInfo() const {
+        if (CachedDebugInfo_) {
+            return CachedDebugInfo_;
+        }
+
+        if (Status_ == ETicketStatus::Malformed) {
+            CachedDebugInfo_ = "status=malformed;";
+            return CachedDebugInfo_;
+        }
+
+        TString targetString = "ticket_type=";
+        targetString.reserve(256);
+        if (Status_ == ETicketStatus::InvalidTicketType) {
+            targetString.append("not-user;");
+            CachedDebugInfo_ = targetString;
+            return targetString;
+        }
+
+        targetString.append("user");
+        if (ProtobufTicket_.expirationtime() > 0)
+            targetString.append(";expiration_time=").append(IntToString<10>(ProtobufTicket_.expirationtime()));
+        for (const auto& scope : ProtobufTicket_.user().scopes()) {
+            targetString.append(";scope=").append(scope);
+        }
+
+        if (ProtobufTicket_.user().defaultuid() > 0)
+            targetString.append(";default_uid=").append(IntToString<10>(ProtobufTicket_.user().defaultuid()));
+        for (const auto& user : ProtobufTicket_.user().users()) {
+            targetString.append(";uid=").append(IntToString<10>(user.uid()));
+        }
+
+        targetString.append(";env=");
+        EBlackboxEnv environment = static_cast<EBlackboxEnv>(ProtobufTicket_.user().env());
+        targetString.append(GetBlackboxEnvAsString(environment));
+        targetString.append(";");
+
+        CachedDebugInfo_ = targetString;
+        return targetString;
+    }
+
+    EBlackboxEnv TCheckedUserTicket::TImpl::GetEnv() const {
+        return (EBlackboxEnv)ProtobufTicket_.user().env();
+    }
+
+    void TCheckedUserTicket::TImpl::SetStatus(ETicketStatus status) {
+        Status_ = status;
+    }
+
+    TCheckedUserTicket::TImpl::TImpl(ETicketStatus status, ticket2::Ticket&& protobufTicket)
+        : Status_(status)
+        , ProtobufTicket_(std::move(protobufTicket))
+    {
+    }
+
+    TUserTicketImplPtr TCheckedUserTicket::TImpl::CreateTicketForTests(ETicketStatus status,
+                                                                       TUid defaultUid,
+                                                                       TScopes scopes,
+                                                                       TUids uids,
+                                                                       EBlackboxEnv env) {
+        auto prepareCont = [](auto& cont) {
+            std::sort(cont.begin(), cont.end());
+            cont.erase(std::unique(cont.begin(), cont.end()), cont.end());
+        };
+        auto erase = [](auto& cont, auto val) {
+            auto it = std::find(cont.begin(), cont.end(), val);
+            if (it != cont.end()) {
+                cont.erase(it);
+            }
+        };
+
+        prepareCont(scopes);
+        erase(scopes, "");
+
+        uids.push_back(defaultUid);
+        prepareCont(uids);
+        erase(uids, 0);
+        Y_ENSURE(!uids.empty(), "User ticket cannot contain empty uid list");
+
+        ticket2::Ticket proto;
+        for (TUid uid : uids) {
+            proto.mutable_user()->add_users()->set_uid(uid);
+        }
+        proto.mutable_user()->set_defaultuid(defaultUid);
+        proto.mutable_user()->set_entrypoint(100500);
+        for (TStringBuf scope : scopes) {
+            proto.mutable_user()->add_scopes(TString(scope));
+        }
+
+        proto.mutable_user()->set_env((tvm_keys::BbEnvType)env);
+
+        return MakeHolder<TImpl>(status, std::move(proto));
+    }
+
+    TUserContext::TImpl::TImpl(EBlackboxEnv env, TStringBuf tvmKeysResponse)
+        : Env_(env)
+    {
+        ResetKeys(tvmKeysResponse);
+    }
+
+    void TUserContext::TImpl::ResetKeys(TStringBuf tvmKeysResponse) {
+        tvm_keys::Keys protoKeys;
+        if (!protoKeys.ParseFromString(TParserTvmKeys::ParseStrV1(tvmKeysResponse))) {
+            ythrow TMalformedTvmKeysException() << "Malformed TVM keys";
+        }
+
+        NRw::TPublicKeys keys;
+        for (int idx = 0; idx < protoKeys.bb_size(); ++idx) {
+            const tvm_keys::BbKey& k = protoKeys.bb(idx);
+            if (IsAllowed(k.env())) {
+                keys.emplace(k.gen().id(),
+                             k.gen().body());
+            }
+        }
+
+        if (keys.empty()) {
+            ythrow TEmptyTvmKeysException() << "Empty TVM keys";
+        }
+
+        Keys_ = std::move(keys);
+    }
+
+    TUserTicketImplPtr TUserContext::TImpl::Check(TStringBuf ticketBody) const {
+        TParserTickets::TRes res = TParserTickets::ParseV3(ticketBody, Keys_, TParserTickets::UserFlag());
+        ETicketStatus status = CheckProtobufUserTicket(res.Ticket);
+
+        if (res.Status != ETicketStatus::Ok && !(res.Status == ETicketStatus::MissingKey && status == ETicketStatus::InvalidBlackboxEnv)) {
+            status = res.Status;
+        }
+        return MakeHolder<TCheckedUserTicket::TImpl>(status, std::move(res.Ticket));
+    }
+
+    ETicketStatus TUserContext::TImpl::CheckProtobufUserTicket(const ticket2::Ticket& ticket) const {
+        if (!ticket.has_user()) {
+            return ETicketStatus::Malformed;
+        }
+        if (!IsAllowed(ticket.user().env())) {
+            return ETicketStatus::InvalidBlackboxEnv;
+        }
+        return ETicketStatus::Ok;
+    }
+
+    const NRw::TPublicKeys& TUserContext::TImpl::GetKeys() const {
+        return Keys_;
+    }
+
+    bool TUserContext::TImpl::IsAllowed(tvm_keys::BbEnvType env) const {
+        if (env == tvm_keys::Prod && (Env_ == EBlackboxEnv::Prod || Env_ == EBlackboxEnv::Stress)) {
+            return true;
+        }
+        if (env == tvm_keys::ProdYateam && Env_ == EBlackboxEnv::ProdYateam) {
+            return true;
+        }
+        if (env == tvm_keys::Test && Env_ == EBlackboxEnv::Test) {
+            return true;
+        }
+        if (env == tvm_keys::TestYateam && Env_ == EBlackboxEnv::TestYateam) {
+            return true;
+        }
+        if (env == tvm_keys::Stress && Env_ == EBlackboxEnv::Stress) {
+            return true;
+        }
+
+        return false;
+    }
+}
diff --git a/library/cpp/tvmauth/src/user_impl.h b/library/cpp/tvmauth/src/user_impl.h
new file mode 100644
index 0000000000..292e94bf5b
--- /dev/null
+++ b/library/cpp/tvmauth/src/user_impl.h
@@ -0,0 +1,72 @@
+#pragma once
+
+#include <library/cpp/tvmauth/src/protos/ticket2.pb.h>
+#include <library/cpp/tvmauth/src/protos/tvm_keys.pb.h>
+#include <library/cpp/tvmauth/src/rw/keys.h>
+
+#include <library/cpp/tvmauth/deprecated/user_context.h>
+
+#include <library/cpp/charset/ci_string.h>
+
+#include <unordered_map>
+
+namespace NTvmAuth {
+    using TUserTicketImplPtr = THolder<TCheckedUserTicket::TImpl>;
+    class TCheckedUserTicket::TImpl {
+    public:
+        explicit operator bool() const;
+
+        TUid GetDefaultUid() const;
+        time_t GetExpirationTime() const;
+        const TScopes& GetScopes() const;
+        bool HasScope(TStringBuf scopeName) const;
+        ETicketStatus GetStatus() const;
+        const TUids& GetUids() const;
+
+        TString DebugInfo() const;
+
+        EBlackboxEnv GetEnv() const;
+
+        void SetStatus(ETicketStatus status);
+
+        /*!
+         * Constructor for creation invalid ticket storing error status in TServiceContext
+         * @param status
+         * @param protobufTicket
+         */
+        TImpl(ETicketStatus status, ticket2::Ticket&& protobufTicket);
+
+        static TUserTicketImplPtr CreateTicketForTests(ETicketStatus status,
+                                                       TUid defaultUid,
+                                                       TScopes scopes,
+                                                       TUids uids,
+                                                       EBlackboxEnv env = EBlackboxEnv::Test);
+
+    private:
+        static const int MaxUserCount = 15;
+
+        ETicketStatus Status_;
+        ticket2::Ticket ProtobufTicket_;
+        mutable TScopes CachedScopes_;
+        mutable TUids CachedUids_;
+        mutable TString CachedDebugInfo_;
+    };
+
+    class TUserContext::TImpl {
+    public:
+        TImpl(EBlackboxEnv env, TStringBuf tvmKeysResponse);
+        void ResetKeys(TStringBuf tvmKeysResponse);
+
+        TUserTicketImplPtr Check(TStringBuf ticketBody) const;
+        const NRw::TPublicKeys& GetKeys() const;
+
+        bool IsAllowed(tvm_keys::BbEnvType env) const;
+
+    private:
+        ETicketStatus CheckProtobufUserTicket(const ticket2::Ticket& ticket) const;
+
+        NRw::TPublicKeys Keys_;
+        EBlackboxEnv Env_;
+        ::google::protobuf::LogSilencer LogSilencer_;
+    };
+}
diff --git a/library/cpp/tvmauth/src/user_ticket.cpp b/library/cpp/tvmauth/src/user_ticket.cpp
new file mode 100644
index 0000000000..3e4e0c0364
--- /dev/null
+++ b/library/cpp/tvmauth/src/user_ticket.cpp
@@ -0,0 +1,56 @@
+#include "user_impl.h"
+
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+
+namespace NTvmAuth {
+    static const char* EX_MSG = "Ticket already moved out";
+
+    TCheckedUserTicket::TCheckedUserTicket(THolder<TCheckedUserTicket::TImpl> impl)
+        : Impl_(std::move(impl))
+    {
+    }
+
+    TCheckedUserTicket::TCheckedUserTicket(TCheckedUserTicket&& o) = default;
+    TCheckedUserTicket::~TCheckedUserTicket() = default;
+    TCheckedUserTicket& TCheckedUserTicket::operator=(TCheckedUserTicket&& o) = default;
+
+    TCheckedUserTicket::operator bool() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->operator bool();
+    }
+
+    const TUids& TCheckedUserTicket::GetUids() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->GetUids();
+    }
+
+    TUid TCheckedUserTicket::GetDefaultUid() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->GetDefaultUid();
+    }
+
+    const TScopes& TCheckedUserTicket::GetScopes() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->GetScopes();
+    }
+
+    bool TCheckedUserTicket::HasScope(TStringBuf scopeName) const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->HasScope(scopeName);
+    }
+
+    ETicketStatus TCheckedUserTicket::GetStatus() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->GetStatus();
+    }
+
+    TString TCheckedUserTicket::DebugInfo() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->DebugInfo();
+    }
+
+    EBlackboxEnv TCheckedUserTicket::GetEnv() const {
+        Y_ENSURE(Impl_, EX_MSG);
+        return Impl_->GetEnv();
+    }
+}
diff --git a/library/cpp/tvmauth/src/ut/parser_ut.cpp b/library/cpp/tvmauth/src/ut/parser_ut.cpp
new file mode 100644
index 0000000000..530f45331a
--- /dev/null
+++ b/library/cpp/tvmauth/src/ut/parser_ut.cpp
@@ -0,0 +1,143 @@
+#include <library/cpp/tvmauth/src/parser.h>
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <library/cpp/tvmauth/exception.h>
+#include <library/cpp/tvmauth/ticket_status.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+Y_UNIT_TEST_SUITE(ParserTestSuite) {
+    using namespace NTvmAuth;
+
+    Y_UNIT_TEST(Keys) {
+        UNIT_ASSERT_EXCEPTION(TParserTvmKeys::ParseStrV1("2:asds"), TMalformedTvmKeysException);
+        UNIT_ASSERT_EXCEPTION(TParserTvmKeys::ParseStrV1("3:asds"), TMalformedTvmKeysException);
+        UNIT_ASSERT_EXCEPTION(TParserTvmKeys::ParseStrV1("1:+a/sds"), TMalformedTvmKeysException);
+
+        UNIT_ASSERT_VALUES_EQUAL("sdsd", NUtils::Bin2base64url(TParserTvmKeys::ParseStrV1("1:sdsd")));
+    }
+
+    Y_UNIT_TEST(TicketsStrV3) {
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::Ok,
+                                                   NUtils::Base64url2bin("CgYIDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg"),
+                                                   NUtils::Base64url2bin("ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA"),
+                                                   "3:serv:CgYIDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg:"}),
+                          TParserTickets::ParseStrV3("3:serv:CgYIDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg:ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA",
+                                                     TParserTickets::ServiceFlag()));
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::UnsupportedVersion,
+                                                   {},
+                                                   {},
+                                                   {}}),
+                          TParserTickets::ParseStrV3("2:serv:CgYIDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg:ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA",
+                                                     TParserTickets::ServiceFlag()));
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::InvalidTicketType,
+                                                   {},
+                                                   {},
+                                                   {}}),
+                          TParserTickets::ParseStrV3("3:serv:CgYIDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg:ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA",
+                                                     TParserTickets::UserFlag()));
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::Malformed,
+                                                   {},
+                                                   {},
+                                                   {}}),
+                          TParserTickets::ParseStrV3("3:serv::ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA",
+                                                     TParserTickets::ServiceFlag()));
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::Malformed,
+                                                   {},
+                                                   {},
+                                                   {}}),
+                          TParserTickets::ParseStrV3("3:serv:CgYIDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg:",
+                                                     TParserTickets::ServiceFlag()));
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::Malformed,
+                                                   {},
+                                                   {},
+                                                   {}}),
+                          TParserTickets::ParseStrV3("3:serv:CgYIDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg:ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA:asd",
+                                                     TParserTickets::ServiceFlag()));
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::Malformed,
+                                                   {},
+                                                   {},
+                                                   {}}),
+                          TParserTickets::ParseStrV3("3:serv:CgY+-*/IDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg:ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA",
+                                                     TParserTickets::ServiceFlag()));
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::Malformed,
+                                                   {},
+                                                   {},
+                                                   {}}),
+                          TParserTickets::ParseStrV3("3:serv:CgYIDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg:ERme/*-+H_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA",
+                                                     TParserTickets::ServiceFlag()));
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::Malformed,
+                                                   {},
+                                                   {},
+                                                   {}}),
+                          TParserTickets::ParseStrV3("",
+                                                     TParserTickets::ServiceFlag()));
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::Malformed,
+                                                   {},
+                                                   {},
+                                                   {}}),
+                          TParserTickets::ParseStrV3("'",
+                                                     TParserTickets::ServiceFlag()));
+
+        // Invalid proto
+        UNIT_ASSERT_EQUAL(TParserTickets::TStrRes({ETicketStatus::Ok,
+                                                   NUtils::Base64url2bin("YIDRCUkQYBgcIgdiYjpzZXNzIghiYjpzZXNzMg"),
+                                                   NUtils::Base64url2bin("ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA"),
+                                                   "3:serv:YIDRCUkQYBgcIgdiYjpzZXNzIghiYjpzZXNzMg:"}),
+                          TParserTickets::ParseStrV3("3:serv:YIDRCUkQYBgcIgdiYjpzZXNzIghiYjpzZXNzMg:ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA",
+                                                     TParserTickets::ServiceFlag()));
+    }
+
+    Y_UNIT_TEST(TicketsV3) {
+        NRw::TPublicKeys pub;
+
+        UNIT_ASSERT_EQUAL(ETicketStatus::Malformed,
+                          TParserTickets::ParseV3("3:serv:CgYIDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg:ERme/*-+H_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA",
+                                                  pub,
+                                                  TParserTickets::ServiceFlag())
+                              .Status);
+
+        // Invalid proto
+        UNIT_ASSERT_EQUAL(ETicketStatus::Malformed,
+                          TParserTickets::ParseV3("3:serv:YIDRCUkQYBgcIgdiYjpzZXNzIghiYjpzZXNzMg:ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA",
+                                                  pub,
+                                                  TParserTickets::ServiceFlag())
+                              .Status);
+
+        // Expire time == 100500
+        UNIT_ASSERT_EQUAL(ETicketStatus::Expired,
+                          TParserTickets::ParseV3("3:serv:CBAQlJEGIhcIDBAcGgdiYjpzZXNzGghiYjpzZXNzMg:HEzPbsjULegBvgX3nqwFX0GfVhESmN1kEWyeT7U03KAR-sQnNYgm6IuN-b9-lQYQKAJSW6p8ffyucC1yDrWSWRxXVzHJUxAVW4hnbiFDtXrurnEdpMK3izKbmTY25PJ4vH3_TkRXk-_oSAE8RvIFKXlh-aw1tezbXBUpJKvyJ0w",
+                                                  pub,
+                                                  TParserTickets::ServiceFlag())
+                              .Status);
+
+        UNIT_ASSERT_EQUAL(ETicketStatus::MissingKey,
+                          TParserTickets::ParseV3("3:serv:CBAQ__________9_IhcIDBAcGgdiYjpzZXNzGghiYjpzZXNzMg:OKjKEbygehEZWH0XEeLzvf0q0aS0VvSk_CKSXGdpqxPbE4RzU70jeM-X9rXVpbYjt76VgBLlBpumJdyiclulfGPDPiL8nwJuu8AnWIR_o-QqyXbsloo2_syE6w2aYw2Yw_5_qjnipYdxGUWegHAGCj3yeMde6O2BmNZ0OCfg6qU",
+                                                  pub,
+                                                  TParserTickets::ServiceFlag())
+                              .Status);
+
+        pub.emplace(16, NRw::TRwPublicKey(NUtils::Base64url2bin("MIGEAoGBALhrihbf3EpjDQS2sCQHazoFgN0nBbE9eesnnFTfzQELXb2gnJU9enmV_aDqaHKjgtLIPpCgn40lHrn5k6mvH5OdedyI6cCzE-N-GFp3nAq0NDJyMe0fhtIRD__CbT0ulcvkeow65ubXWfw6dBC2gR_34rdMe_L_TGRLMWjDULbN")));
+        UNIT_ASSERT_EQUAL(ETicketStatus::SignBroken,
+                          TParserTickets::ParseV3("3:serv:CBAQ__________9_IhcIDBAcGgdiYjpzZXNzGghiYjpzZXNzMa:OKjKEbygehEZWH0XEeLzvf0q0aS0VvSk_CKSXGdpqxPbE4RzU70jeM-X9rXVpbYjt76VgBLlBpumJdyiclulfGPDPiL8nwJuu8AnWIR_o-QqyXbsloo2_syE6w2aYw2Yw_5_qjnipYdxGUWegHAGCj3yeMde6O2BmNZ0OCfg6qU",
+                                                  pub,
+                                                  TParserTickets::ServiceFlag())
+                              .Status);
+        UNIT_ASSERT_EQUAL(ETicketStatus::SignBroken,
+                          TParserTickets::ParseV3("3:serv:CBAQ__________9_IhcIDBAcGgdiYjpzZXNzGghiYjpzZXNzMg:OKjKEbygehEZWH0XEeLzvf0q0aS0VvSk_CKSXGdpqxPbE4RzU70jeM-X9rXVpbYjt76VgBLlBpumJdyiclulfGPDPiL8nwJuu8AnWIR_o-QqyXbsloo2_syE6w2aYw2Yw_5_qjnipYdxGUWegHAGCj3yeMde6O2BmNZ0OCfg6qa",
+                                                  pub,
+                                                  TParserTickets::ServiceFlag())
+                              .Status);
+        UNIT_ASSERT_EQUAL(ETicketStatus::SignBroken,
+                          TParserTickets::ParseV3("3:serv:CBAQ__________9_IhcIDBAcGgdiYjpzZXNzGghiYjpzZXNzMg:EbygehEZWH0XEeLzvf0q0aS0VvSk_CKSXGdpqxPbE4RzU70jeM-X9rXVpbYjt76VgBLlBpumJdyiclulfGPDPiL8nwJuu8AnWIR_o-QqyXbsloo2_syE6w2aYw2Yw_5_qjnipYdxGUWegHAGCj3yeMde6O2BmNZ0OCfg6qU",
+                                                  pub,
+                                                  TParserTickets::ServiceFlag())
+                              .Status);
+
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok,
+                          TParserTickets::ParseV3("3:serv:CBAQ__________9_IhcIDBAcGgdiYjpzZXNzGghiYjpzZXNzMg:OKjKEbygehEZWH0XEeLzvf0q0aS0VvSk_CKSXGdpqxPbE4RzU70jeM-X9rXVpbYjt76VgBLlBpumJdyiclulfGPDPiL8nwJuu8AnWIR_o-QqyXbsloo2_syE6w2aYw2Yw_5_qjnipYdxGUWegHAGCj3yeMde6O2BmNZ0OCfg6qU",
+                                                  pub,
+                                                  TParserTickets::ServiceFlag())
+                              .Status);
+    }
+}
diff --git a/library/cpp/tvmauth/src/ut/public_ut.cpp b/library/cpp/tvmauth/src/ut/public_ut.cpp
new file mode 100644
index 0000000000..74a483d57b
--- /dev/null
+++ b/library/cpp/tvmauth/src/ut/public_ut.cpp
@@ -0,0 +1,290 @@
+// DO_NOT_STYLE
+#include <library/cpp/tvmauth/src/service_impl.h>
+#include <library/cpp/tvmauth/src/user_impl.h>
+
+#include <library/cpp/tvmauth/exception.h>
+#include <library/cpp/tvmauth/ticket_status.h>
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(CommonPublicInterfaceTestSuite){
+    Y_UNIT_TEST(StatusTest){
+        UNIT_ASSERT_VALUES_EQUAL("OK",
+                                  StatusToString(ETicketStatus::Ok));
+        UNIT_ASSERT_VALUES_EQUAL("Expired ticket",
+                                  StatusToString(ETicketStatus::Expired));
+        UNIT_ASSERT_VALUES_EQUAL("Invalid BlackBox environment",
+                                  StatusToString(ETicketStatus::InvalidBlackboxEnv));
+        UNIT_ASSERT_VALUES_EQUAL("Invalid ticket destination",
+                                  StatusToString(ETicketStatus::InvalidDst));
+        UNIT_ASSERT_VALUES_EQUAL("Invalid ticket type",
+                                  StatusToString(ETicketStatus::InvalidTicketType));
+        UNIT_ASSERT_VALUES_EQUAL("Malformed ticket",
+                                  StatusToString(ETicketStatus::Malformed));
+        UNIT_ASSERT_VALUES_EQUAL("Invalid ticket signature",
+                                  StatusToString(ETicketStatus::SignBroken));
+        UNIT_ASSERT_VALUES_EQUAL("Context does not have required key to check ticket: public keys are too old",
+                                  StatusToString(ETicketStatus::MissingKey));
+        UNIT_ASSERT_VALUES_EQUAL("Unsupported ticket version",
+                                  StatusToString(ETicketStatus::UnsupportedVersion));
+    }
+}
+
+Y_UNIT_TEST_SUITE(PublicInterfaceServiceTestSuite) {
+    static const TString EMPTY_TVM_KEYS = "1:CpgCCpMCCAEQABqIAjCCAQQCggEAcLEXeH67FQESFUn4_7wnX7wN0PUrBoUsm3QQ4W5vC-qz6sXaEjSwnTV8w1o-z6X9KPLlhzMQvuS38NCNfK4uvJ4Zvfp3YsXJ25-rYtbnrYJHNvHohD-kPCCw_yZpMp21JdWigzQGuV7CtrxUhF-NNrsnUaJrE5-OpEWNt4X6nCItKIYeVcSK6XJUbEWbrNCRbvkSc4ak2ymFeMuHYJVjxh4eQbk7_ZPzodP0WvF6eUYrYeb42imVEOR8ofVLQWE5DVnb1z_TqZm4i1XkS7jMwZuBxBRw8DGdYei0lT_sAf7KST2jC0590NySB3vsBgWEVs1OdUUWA6r-Dvx9dsOQtSCVkQYQAAqZAgqUAggCEAAaiQIwggEFAoIBAQDhEBM5-6YsPWfogKtbluJoCX1WV2KdzOaQ0-OlRbBzeCzw-eQKu12c8WakHBbeCMd1I1TU64SDkDorWjXGIa_2xT6N3zzNAE50roTbPCcmeQrps26woTYfYIuqDdoxYKZNr0lvNLLW47vBr7EKqo1S4KSj7aXK_XYeEvUgIgf3nVIcNrio7VTnFmGGVQCepaL1Hi1gN4yIXjVZ06PBPZ-DxSRu6xOGbFrfKMJeMPs7KOyE-26Q3xOXdTIa1X-zYIucTd_bxUCL4BVbwW2AvbbFsaG7ISmVdGu0XUTmhXs1KrEfUVLRJhE4Dx99hAZXm1_HlYMUeJcMQ_oHOhV94ENFIJaRBhACCpYBCpEBCAMQABqGATCBgwKBgF9t2YJGAJkRRFq6fWhi3m1TFW1UOE0f6ZrfYhHAkpqGlKlh0QVfeTNPpeJhi75xXzCe6oReRUm-0DbqDNhTShC7uGUv1INYnRBQWH6E-5Fc5XrbDFSuGQw2EYjNfHy_HefHJXxQKAqPvxBDKMKkHgV58WtM6rC8jRi9sdX_ig2NIJeRBhABCpYBCpEBCAQQABqGATCBgwKBgGB4d6eLGUBv-Q6EPLehC4S-yuE2HB-_rJ7WkeYwyp-xIPolPrd-PQme2utHB4ZgpXHIu_OFksDe_0bPgZniNRSVRbl7W49DgS5Ya3kMfrYB4DnF5Fta5tn1oV6EwxYD4JONpFTenOJALPGTPawxXEfon_peiHOSBuQMu3_Vn-l1IJiRBhADCpcBCpIBCAUQABqHATCBhAKBgQCTJMKIfmfeZpaI7Q9rnsc29gdWawK7TnpVKRHws1iY7EUlYROeVcMdAwEqVM6f8BVCKLGgzQ7Gar_uuxfUGKwqEQzoppDraw4F75J464-7D5f6_oJQuGIBHZxqbMONtLjBCXRUhQW5szBLmTQ_R3qaJb5vf-h0APZfkYhq1cTttSCZkQYQBAqWAQqRAQgLEAAahgEwgYMCgYBvvGVH_M2H8qxxv94yaDYUTWbRnJ1uiIYc59KIQlfFimMPhSS7x2tqUa2-hI55JiII0Xym6GNkwLhyc1xtWChpVuIdSnbvttbrt4weDMLHqTwNOF6qAsVKGKT1Yh8yf-qb-DSmicgvFc74mBQm_6gAY1iQsf33YX8578ClhKBWHSCVkQYQAAqXAQqSAQgMEAAahwEwgYQCgYEAkuzFcd5TJu7lYWYe2hQLFfUWIIj91BvQQLa_Thln4YtGCO8gG1KJqJm-YlmJOWQG0B7H_5RVhxUxV9KpmFnsDVkzUFKOsCBaYGXc12xPVioawUlAwp5qp3QQtZyx_se97YIoLzuLr46UkLcLnkIrp-Jo46QzYi_QHq45WTm8MQ0glpEGEAIKlwEKkgEIDRAAGocBMIGEAoGBAIUzbxOknXf_rNt17_ir8JlWvrtnCWsQd1MAnl5mgArvavDtKeBYHzi5_Ak7DHlLzuA6YE8W175FxLFKpN2hkz-l-M7ltUSd8N1BvJRhK4t6WffWfC_1wPyoAbeSN2Yb1jygtZJQ8wGoXHcJQUXiMit3eFNyylwsJFj1gzAR4JCdIJeRBhABCpYBCpEBCA4QABqGATCBgwKBgFMcbEpl9ukVR6AO_R6sMyiU11I8b8MBSUCEC15iKsrVO8v_m47_TRRjWPYtQ9eZ7o1ocNJHaGUU7qqInFqtFaVnIceP6NmCsXhjs3MLrWPS8IRAy4Zf4FKmGOx3N9O2vemjUygZ9vUiSkULdVrecinRaT8JQ5RG4bUMY04XGIwFIJiRBhADCpYBCpEBCA8QABqGATCBgwKBgGpCkW-NR3li8GlRvqpq2YZGSIgm_PTyDI2Zwfw69grsBmPpVFW48Vw7xoMN35zcrojEpialB_uQzlpLYOvsMl634CRIuj-n1QE3-gaZTTTE8mg-AR4mcxnTKThPnRQpbuOlYAnriwiasWiQEMbGjq_HmWioYYxFo9USlklQn4-9IJmRBhAE";
+    static const TString EXPIRED_SERVICE_TICKET = "3:serv:CBAQACIZCOUBEBwaCGJiOnNlc3MxGghiYjpzZXNzMg:IwfMNJYEqStY_SixwqJnyHOMCPR7-3HHk4uylB2oVRkthtezq-OOA7QizDvx7VABLs_iTlXuD1r5IjufNei_EiV145eaa3HIg4xCdJXCojMexf2UYJz8mF2b0YzFAy6_KWagU7xo13CyKAqzJuQf5MJcSUf0ecY9hVh36cJ51aw";
+    static const TString MALFORMED_TVM_KEYS = "1:CpgCCpMCCAEQABqIAjCCAQQCggEAcLEXeH67FQESFUn4_7wnX7wN0PUrBoUsm3QQ4W5vC-qz6sXaEjSwnTV8w1o-z6X9KPLlhzMQvuS38NCNfK4uvJ4Zvfp3YsXJ25-rYtbnrYJHNvHohD-kPCCw_yZpMp21JdWigzQGuV7CtrxUhF-NNrsnUaJrE5-OpEWNt4X6nCItKIYeVcSK6XJUbEWbrNCRbvkSc4ak2ymFeMuHYJVjxh4eQbk7_ZPzodP0WvF6eUYrYeb42imVEOR8ofVLQWE5DVnb1z_TqZm4i1XkS7jMwZuBxBRw8DGdYei0lT_sAf7KST2jC0590NySB3vsBgWEVs1OdUUWA6r-Dvx9dsOQtSCVkQYQAAqZAgqUAggCEAAaiQIwggEFAoIBAQDhEBM5-6YsPWfogKtbluJoCX1WV2KdzOaQ0-OlRbBzeCzw-eQKu12c8WakHBbeCMd1I1TU64SDkDorWjXGIa_2xT6N3zzNAE50roTbPCcmeQrps26woTYfYIuqDdoxYKZNr0lvNLLW47vBr7EKqo1S4KSj7aXK_XYeEvUgIgf3nVIcNrio7VTnFmGGVQCepaL1Hi1gN4yIXjVZ06PBPZ-DxSRu6xOGbFrfKMJeMPs7KOyE-26Q3xOXdTIa1X-zYIucTd_bxUCL4BVbwW2AvbbFsaG7ISmVdGu0XUTmhXs1KrEfUVLRJhE4Dx99hAZXm1_HlYMUeJcMQ_oHOhV94ENFIJaRBhACCpYBCpEBCAMQABqGATCBgwKBgF9t2YJGAJkRRFq6fWhi3m1TFW1UOE0f6ZrfYhHAkpqGlKlh0QVfeTNPpeJhi75xXzCe6oReRUm-0DbqDNhTShC7uGUv1INYnRBQWH6E-5Fc5XrbDFSuGQw2EYjNfHy_HefHJXxQKAqPvxBDKMKkHgV58WtM6rC8jRi9sdX_ig2NIJeRBhABCpYBCpEBCAQQABqGATCBgwKBgGB4d6eLGUBv-Q6EPLehC4S-yuE2HB-_rJ7WkeYwyp-xIPolPrd-PQme2utHB4ZgpXHIu_OFksDe_0bPgZniNRSVRbl7W49DgS5Ya3kMfrYB4DnF5Fta5tn1oV6EwxYD4JONpFTenOJALPGTPawxXEfon_peiHOSBuQMu3_Vn-l1IJiRBhADCpcBCpIBCAUQABqHATCBhAKBgQCTJMKIfmfeZpaI7Q9rnsc29gdWawK7TnpVKRHws1iY7EUlYROeVcMdAwEqVM6f8BVCKLGgzQ7Gar_uuxfUGKwqEQzoppDraw4F75J464-7D5f6_oJQuGIBHZxqbMONtLjBCXRUhQW5szBLmTQ_R3qaJb5vf-h0APZfkYhq1cTttSCZkQYQBAqWAQqRAQgLEAAahgEwgYMCgYBvvGVH_M2H8qxxv94yaDYUTWbRnJ1uiIYc59KIQlfFimMPhSS7x2tqUa2-hI55JiII0Xym6GNkwLhyc1xtWChpVuIdSnbvttbrt4weDMLHqTwNOF6qAsVKGKT1Yh8yf-qb-DSmicgvFc74mBQm_6gAY1iQsf33YX8578ClhKBWHSCVkQYQAAqXAQqSAQgMEAAahwEwgYQCgYEAkuzFcd5TJu7lYWYe2hQLFfUWIIj91BvQQLa_Thln4YtGCO8gG1KJqJm-YlmJOWQG0B7H_5RVhxUxV9KpmFnsDVkzUFKOsCBaYGXc12xPVioawUlAwp5qp3QQtZyx_se97YIoLzuLr46UkLcLnkIrp-Jo46QzYi_QHq45WTm8MQ0glpEGEAIKlwEKkgEIDRAAGocBMIGEAoGBAIUzbxOknXf_rNt17_ir8JlWvrtnCWsQd1MAnl5mgArvavDtKeBYHzi5_Ak7DHlLzuA6YE8W175FxLFKpN2hkz-l-M7ltUSd8N1BvJRhK4t6WffWfC_1wPyoAbeSN2Yb1jygtZJQ8wGoXHcJQUXiMit3eFNyylwsJFj1gzAR4JCdIJeRBhABCpYBCpEBCA4QABqGATCBgwKBgFMcbEpl9ukVR6AO_R6sMyiU11I8b8MBSUCEC15iKsrVO8v_m47_TRRjWPYtQ9eZ7o1ocNJHaGUU7qqInFqtFaVnIceP6NmCsXhjs3MLrWPS8IRAy4Zf4FKmGOx3N9O2vemjUygZ9vUiSkULdVrecinRaT8JQ5RG4bUMY04XGIwFIJiRBhADCpYBCpEBCA8QABqGATCBgwKBgGpCkW-NR3li8GlRvqpq2YZGSIgm_PTyDI2Zwfw69grsBmPpVFW48Vw7xoMN35zcrojEpialB_uQzlpLYOvsMl634CRIuj-n1QE3-gaZTTTE8mg-AR4mcxnTKThPnRQpbuOlYAnriwiasWiQEMbGjq_HmWioYYxFo9USlklQn4-9IJmRBhAEEpUBCpIBCAYQABqHATCBhAKBgQCoZkFGm9oLTqjeXZAq6j5S6i7K20V0lNdBBLqfmFBIRuTkYxhs4vUYnWjZrKRAd5bp6_py0csmFmpl_5Yh0b-2pdo_E5PNP7LGRzKyKSiFddyykKKzVOazH8YYldDAfE8Z5HoS9e48an5JsPg0jr-TPu34DnJq3yv2a6dqiKL9zSCakQYSlQEKkgEIEBAAGocBMIGEAoGBALhrihbf3EpjDQS2sCQHazoFgN0nBbE9eesnnFTfzQELXb2gnJU9enmV_aDqaHKjgtLIPpCgn40lHrn5k6mvH5OdedyI6cCzE-N-GFp3nAq0NDJyMe0fhtIRD__CbT0ulcvkeow65ubXWfw6dBC2gR_34rdMe_L_TGRLMWjDULbNIJ";
+    static const TString MALFORMED_TVM_SECRET = "adcvxcv./-+";
+    static const TTvmId NOT_OUR_ID = 27;
+    static const TTvmId OUR_ID = 28;
+    static const TString SECRET = "GRMJrKnj4fOVnvOqe-WyD1";
+    static const TString SERVICE_TICKET_PROTOBUF = "CBAQ__________9_IhkI5QEQHBoIYmI6c2VzczEaCGJiOnNlc3My";
+    static const TTvmId SRC_ID = 229;
+    static const TString UNSUPPORTED_VERSION_SERVICE_TICKET = "2:serv:CBAQ__________9_IhkI5QEQHBoIYmI6c2VzczEaCGJiOnNlc3My:WUPx1cTf05fjD1exB35T5j2DCHWH1YaLJon_a4rN-D7JfXHK1Ai4wM4uSfboHD9xmGQH7extqtlEk1tCTCGm5qbRVloJwWzCZBXo3zKX6i1oBYP_89WcjCNPVe1e8jwGdLsnu6PpxL5cn0xCksiStILH5UmDR6xfkJdnmMG94o8";
+    static const TString VALID_SERVICE_TICKET_1 = "3:serv:CBAQ__________9_IhkI5QEQHBoIYmI6c2VzczEaCGJiOnNlc3My:WUPx1cTf05fjD1exB35T5j2DCHWH1YaLJon_a4rN-D7JfXHK1Ai4wM4uSfboHD9xmGQH7extqtlEk1tCTCGm5qbRVloJwWzCZBXo3zKX6i1oBYP_89WcjCNPVe1e8jwGdLsnu6PpxL5cn0xCksiStILH5UmDR6xfkJdnmMG94o8";
+    static const TString VALID_SERVICE_TICKET_2 = "3:serv:CBAQ__________9_IskICOUBEBwaCGJiOnNlc3MxGgliYjpzZXNzMTAaCmJiOnNlc3MxMDAaCWJiOnNlc3MxMRoJYmI6c2VzczEyGgliYjpzZXNzMTMaCWJiOnNlc3MxNBoJYmI6c2VzczE1GgliYjpzZXNzMTYaCWJiOnNlc3MxNxoJYmI6c2VzczE4GgliYjpzZXNzMTkaCGJiOnNlc3MyGgliYjpzZXNzMjAaCWJiOnNlc3MyMRoJYmI6c2VzczIyGgliYjpzZXNzMjMaCWJiOnNlc3MyNBoJYmI6c2VzczI1GgliYjpzZXNzMjYaCWJiOnNlc3MyNxoJYmI6c2VzczI4GgliYjpzZXNzMjkaCGJiOnNlc3MzGgliYjpzZXNzMzAaCWJiOnNlc3MzMRoJYmI6c2VzczMyGgliYjpzZXNzMzMaCWJiOnNlc3MzNBoJYmI6c2VzczM1GgliYjpzZXNzMzYaCWJiOnNlc3MzNxoJYmI6c2VzczM4GgliYjpzZXNzMzkaCGJiOnNlc3M0GgliYjpzZXNzNDAaCWJiOnNlc3M0MRoJYmI6c2VzczQyGgliYjpzZXNzNDMaCWJiOnNlc3M0NBoJYmI6c2VzczQ1GgliYjpzZXNzNDYaCWJiOnNlc3M0NxoJYmI6c2VzczQ4GgliYjpzZXNzNDkaCGJiOnNlc3M1GgliYjpzZXNzNTAaCWJiOnNlc3M1MRoJYmI6c2VzczUyGgliYjpzZXNzNTMaCWJiOnNlc3M1NBoJYmI6c2VzczU1GgliYjpzZXNzNTYaCWJiOnNlc3M1NxoJYmI6c2VzczU4GgliYjpzZXNzNTkaCGJiOnNlc3M2GgliYjpzZXNzNjAaCWJiOnNlc3M2MRoJYmI6c2VzczYyGgliYjpzZXNzNjMaCWJiOnNlc3M2NBoJYmI6c2VzczY1GgliYjpzZXNzNjYaCWJiOnNlc3M2NxoJYmI6c2VzczY4GgliYjpzZXNzNjkaCGJiOnNlc3M3GgliYjpzZXNzNzAaCWJiOnNlc3M3MRoJYmI6c2VzczcyGgliYjpzZXNzNzMaCWJiOnNlc3M3NBoJYmI6c2Vzczc1GgliYjpzZXNzNzYaCWJiOnNlc3M3NxoJYmI6c2Vzczc4GgliYjpzZXNzNzkaCGJiOnNlc3M4GgliYjpzZXNzODAaCWJiOnNlc3M4MRoJYmI6c2VzczgyGgliYjpzZXNzODMaCWJiOnNlc3M4NBoJYmI6c2Vzczg1GgliYjpzZXNzODYaCWJiOnNlc3M4NxoJYmI6c2Vzczg4GgliYjpzZXNzODkaCGJiOnNlc3M5GgliYjpzZXNzOTAaCWJiOnNlc3M5MRoJYmI6c2VzczkyGgliYjpzZXNzOTMaCWJiOnNlc3M5NBoJYmI6c2Vzczk1GgliYjpzZXNzOTYaCWJiOnNlc3M5NxoJYmI6c2Vzczk4GgliYjpzZXNzOTk:JYmABAVLM6y7_T4n1pRcwBfwDfzMV4JJ3cpbEG617zdGgKRZwL7MalsYn5bq1F2ibujMrsF9nzZf8l4s_e-Ivjkz_xu4KMzSp-pUh9V7XIF_smj0WHYpv6gOvWNuK8uIvlZTTKwtQX0qZOL9m-MEeZiHoQPKZGCfJ_qxMUp-J8I";
+    static const TString VALID_SERVICE_TICKET_3 = "3:serv:CBAQ__________9_IgUI5QEQHA:Sd6tmA1CNy2Nf7XevC3x7zr2DrGNRmcl-TxUsDtDW2xI3YXyCxBltWeg0-KtDlqyYuPOP5Jd_-XXNA12KlOPnNzrz3jm-5z8uQl6CjCcrVHUHJ75pGC8r9UOlS8cOgeXQB5dYP-fOWyo5CNadlozx1S2meCIxncbQRV1kCBi4KU";
+
+    Y_UNIT_TEST(BlackboxTvmIdTest) {
+        UNIT_ASSERT_VALUES_EQUAL("222", NBlackboxTvmId::Prod);
+        UNIT_ASSERT_VALUES_EQUAL("224", NBlackboxTvmId::Test);
+        UNIT_ASSERT_VALUES_EQUAL("223", NBlackboxTvmId::ProdYateam);
+        UNIT_ASSERT_VALUES_EQUAL("225", NBlackboxTvmId::TestYateam);
+        UNIT_ASSERT_VALUES_EQUAL("226", NBlackboxTvmId::Stress);
+        UNIT_ASSERT_VALUES_EQUAL("239", NBlackboxTvmId::Mimino);
+    }
+
+    Y_UNIT_TEST(Case1Test) {
+        TServiceContext context1(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        TServiceContext context2 = std::move(context1);
+        TServiceContext context3(std::move(context2));
+
+        TCheckedServiceTicket checkedTicket1 = context3.Check(VALID_SERVICE_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket1.GetStatus());
+        TCheckedServiceTicket checkedTicket2 = std::move(checkedTicket1);
+        TCheckedServiceTicket checkedTicket3(std::move(checkedTicket2));
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket3.GetStatus());
+    }
+
+    Y_UNIT_TEST(ContextExceptionsTest) {
+        UNIT_ASSERT_EXCEPTION(TServiceContext(SECRET, OUR_ID, MALFORMED_TVM_KEYS), TMalformedTvmKeysException);
+        UNIT_ASSERT_EXCEPTION(TServiceContext(SECRET, OUR_ID, EMPTY_TVM_KEYS), TEmptyTvmKeysException);
+        UNIT_ASSERT_EXCEPTION(TServiceContext(MALFORMED_TVM_SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS), TMalformedTvmSecretException);
+    }
+
+    Y_UNIT_TEST(ContextSignTest) {
+        TServiceContext context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT_VALUES_EQUAL(
+            "NsPTYak4Cfk-4vgau5lab3W4GPiTtb2etuj3y4MDPrk",
+            context.SignCgiParamsForTvm(IntToString<10>(std::numeric_limits<time_t>::max()), "13,28", ""));
+    }
+
+    Y_UNIT_TEST(ContextSignExceptionTest) {
+        TServiceContext context = TServiceContext::CheckingFactory(OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT_EXCEPTION(
+            context.SignCgiParamsForTvm(IntToString<10>(std::numeric_limits<time_t>::max()), "13,28", ""),
+            TMalformedTvmSecretException
+        );
+
+        context = TServiceContext::SigningFactory(SECRET);
+        UNIT_ASSERT_NO_EXCEPTION(
+            context.SignCgiParamsForTvm(IntToString<10>(std::numeric_limits<time_t>::max()), "13,28", "")
+        );
+    }
+
+    Y_UNIT_TEST(ContextCheckExceptionTest) {
+        TServiceContext context = TServiceContext::CheckingFactory(OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT_NO_EXCEPTION(
+            context.Check("ABCDE")
+        );
+
+        context = TServiceContext::SigningFactory(SECRET);
+        UNIT_ASSERT_EXCEPTION(
+            context.Check("ABCDE"),
+            TEmptyTvmKeysException
+        );
+    }
+
+
+    Y_UNIT_TEST(ContextTest) {
+        TServiceContext context1(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        TServiceContext context2 = TServiceContext::CheckingFactory(OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+    }
+
+    Y_UNIT_TEST(Ticket1Test) {
+        TServiceContext context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_SERVICE_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket.GetStatus());
+        UNIT_ASSERT_EQUAL(SRC_ID, checkedTicket.GetSrc());
+        UNIT_ASSERT_EQUAL("ticket_type=serv;expiration_time=9223372036854775807;src=229;dst=28;scope=bb:sess1;scope=bb:sess2;", checkedTicket.DebugInfo());
+    }
+
+    Y_UNIT_TEST(Ticket2Test) {
+        TServiceContext context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_SERVICE_TICKET_2);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket.GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=serv;expiration_time=9223372036854775807;src=229;dst=28;scope=bb:sess1;scope=bb:sess10;scope=bb:sess100;scope=bb:sess11;scope=bb:sess12;scope=bb:sess13;scope=bb:sess14;scope=bb:sess15;scope=bb:sess16;scope=bb:sess17;scope=bb:sess18;scope=bb:sess19;scope=bb:sess2;scope=bb:sess20;scope=bb:sess21;scope=bb:sess22;scope=bb:sess23;scope=bb:sess24;scope=bb:sess25;scope=bb:sess26;scope=bb:sess27;scope=bb:sess28;scope=bb:sess29;scope=bb:sess3;scope=bb:sess30;scope=bb:sess31;scope=bb:sess32;scope=bb:sess33;scope=bb:sess34;scope=bb:sess35;scope=bb:sess36;scope=bb:sess37;scope=bb:sess38;scope=bb:sess39;scope=bb:sess4;scope=bb:sess40;scope=bb:sess41;scope=bb:sess42;scope=bb:sess43;scope=bb:sess44;scope=bb:sess45;scope=bb:sess46;scope=bb:sess47;scope=bb:sess48;scope=bb:sess49;scope=bb:sess5;scope=bb:sess50;scope=bb:sess51;scope=bb:sess52;scope=bb:sess53;scope=bb:sess54;scope=bb:sess55;scope=bb:sess56;scope=bb:sess57;scope=bb:sess58;scope=bb:sess59;scope=bb:sess6;scope=bb:sess60;scope=bb:sess61;scope=bb:sess62;scope=bb:sess63;scope=bb:sess64;scope=bb:sess65;scope=bb:sess66;scope=bb:sess67;scope=bb:sess68;scope=bb:sess69;scope=bb:sess7;scope=bb:sess70;scope=bb:sess71;scope=bb:sess72;scope=bb:sess73;scope=bb:sess74;scope=bb:sess75;scope=bb:sess76;scope=bb:sess77;scope=bb:sess78;scope=bb:sess79;scope=bb:sess8;scope=bb:sess80;scope=bb:sess81;scope=bb:sess82;scope=bb:sess83;scope=bb:sess84;scope=bb:sess85;scope=bb:sess86;scope=bb:sess87;scope=bb:sess88;scope=bb:sess89;scope=bb:sess9;scope=bb:sess90;scope=bb:sess91;scope=bb:sess92;scope=bb:sess93;scope=bb:sess94;scope=bb:sess95;scope=bb:sess96;scope=bb:sess97;scope=bb:sess98;scope=bb:sess99;", checkedTicket.DebugInfo());
+    }
+
+    Y_UNIT_TEST(Ticket3Test) {
+        TServiceContext context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_SERVICE_TICKET_3);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket.GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=serv;expiration_time=9223372036854775807;src=229;dst=28;", checkedTicket.DebugInfo());
+    }
+
+    Y_UNIT_TEST(TicketCheckingTest) {
+        TServiceContext context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto ticket = context.Check(VALID_SERVICE_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, ticket.GetStatus());
+        UNIT_ASSERT_EQUAL(SRC_ID, ticket.GetSrc());
+    }
+
+    Y_UNIT_TEST(TicketErrorsTest) {
+        TServiceContext context(SECRET, NOT_OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket1 = context.Check(VALID_SERVICE_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::InvalidDst, checkedTicket1.GetStatus());
+
+        auto checkedTicket2 = context.Check(UNSUPPORTED_VERSION_SERVICE_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::UnsupportedVersion, checkedTicket2.GetStatus());
+
+        auto checkedTicket3 = context.Check(EXPIRED_SERVICE_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Expired, checkedTicket3.GetStatus());
+    }
+
+    Y_UNIT_TEST(TicketExceptionsTest) {
+        TServiceContext context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(EXPIRED_SERVICE_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Expired, checkedTicket.GetStatus());
+
+        UNIT_ASSERT(!bool(checkedTicket));
+        UNIT_ASSERT_EXCEPTION(checkedTicket.GetSrc(), TNotAllowedException);
+        UNIT_ASSERT_NO_EXCEPTION(bool(checkedTicket));
+        UNIT_ASSERT_NO_EXCEPTION(checkedTicket.DebugInfo());
+        UNIT_ASSERT_NO_EXCEPTION(checkedTicket.GetStatus());
+    }
+
+    Y_UNIT_TEST(RemoveSignatureTest) {
+        UNIT_ASSERT_VALUES_EQUAL("1:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds",
+                                  NUtils::RemoveTicketSignature("1:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("2:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds",
+                                  NUtils::RemoveTicketSignature("2:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("4:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds",
+                                  NUtils::RemoveTicketSignature("4:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("3.serv.ASDkljbjhsdbfLJHABFJHBslfbsfjs.asdxcvbxcvniueliuweklsvds",
+                                  NUtils::RemoveTicketSignature("3.serv.ASDkljbjhsdbfLJHABFJHBslfbsfjs.asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("3:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:",
+                                  NUtils::RemoveTicketSignature("3:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("3:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:",
+                                  NUtils::RemoveTicketSignature("3:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("3:serv:",
+                                  NUtils::RemoveTicketSignature("3:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs.asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("asdxcbvfgdsgfasdfxczvdsgfxcdvbcbvf",
+                                  NUtils::RemoveTicketSignature("asdxcbvfgdsgfasdfxczvdsgfxcdvbcbvf"));
+    }
+
+    Y_UNIT_TEST(ResetKeysTest) {
+        TServiceContext context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        TCheckedServiceTicket checkedTicket = context.Check(VALID_SERVICE_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket.GetStatus());
+    }
+}
+
+Y_UNIT_TEST_SUITE(PublicInterfaceUserTestSuite) {
+    static const TString EMPTY_TVM_KEYS = "1:EpUBCpIBCAYQABqHATCBhAKBgQCoZkFGm9oLTqjeXZAq6j5S6i7K20V0lNdBBLqfmFBIRuTkYxhs4vUYnWjZrKRAd5bp6_py0csmFmpl_5Yh0b-2pdo_E5PNP7LGRzKyKSiFddyykKKzVOazH8YYldDAfE8Z5HoS9e48an5JsPg0jr-TPu34DnJq3yv2a6dqiKL9zSCakQY";
+    static const TString EXPIRED_USER_TICKET = "3:user:CA0QABokCgMIyAMKAgh7EMgDGghiYjpzZXNzMRoIYmI6c2VzczIgEigB:D0CmYVwWg91LDYejjeQ2UP8AeiA_mr1q1CUD_lfJ9zQSEYEOYGDTafg4Um2rwOOvQnsD1JHM4zHyMUJ6Jtp9GAm5pmhbXBBZqaCcJpyxLTEC8a81MhJFCCJRvu_G1FiAgRgB25gI3HIbkvHFUEqAIC_nANy7NFQnbKk2S-EQPGY";
+    static const TString MALFORMED_TVM_KEYS = "1:CpgCCpMCCAEQABqIAjCCAQQCggEAcLEXeH67FQESFUn4_7wnX7wN0PUrBoUsm3QQ4W5vC-qz6sXaEjSwnTV8w1o-z6X9KPLlhzMQvuS38NCNfK4uvJ4Zvfp3YsXJ25-rYtbnrYJHNvHohD-kPCCw_yZpMp21JdWigzQGuV7CtrxUhF-NNrsnUaJrE5-OpEWNt4X6nCItKIYeVcSK6XJUbEWbrNCRbvkSc4ak2ymFeMuHYJVjxh4eQbk7_ZPzodP0WvF6eUYrYeb42imVEOR8ofVLQWE5DVnb1z_TqZm4i1XkS7jMwZuBxBRw8DGdYei0lT_sAf7KST2jC0590NySB3vsBgWEVs1OdUUWA6r-Dvx9dsOQtSCVkQYQAAqZAgqUAggCEAAaiQIwggEFAoIBAQDhEBM5-6YsPWfogKtbluJoCX1WV2KdzOaQ0-OlRbBzeCzw-eQKu12c8WakHBbeCMd1I1TU64SDkDorWjXGIa_2xT6N3zzNAE50roTbPCcmeQrps26woTYfYIuqDdoxYKZNr0lvNLLW47vBr7EKqo1S4KSj7aXK_XYeEvUgIgf3nVIcNrio7VTnFmGGVQCepaL1Hi1gN4yIXjVZ06PBPZ-DxSRu6xOGbFrfKMJeMPs7KOyE-26Q3xOXdTIa1X-zYIucTd_bxUCL4BVbwW2AvbbFsaG7ISmVdGu0XUTmhXs1KrEfUVLRJhE4Dx99hAZXm1_HlYMUeJcMQ_oHOhV94ENFIJaRBhACCpYBCpEBCAMQABqGATCBgwKBgF9t2YJGAJkRRFq6fWhi3m1TFW1UOE0f6ZrfYhHAkpqGlKlh0QVfeTNPpeJhi75xXzCe6oReRUm-0DbqDNhTShC7uGUv1INYnRBQWH6E-5Fc5XrbDFSuGQw2EYjNfHy_HefHJXxQKAqPvxBDKMKkHgV58WtM6rC8jRi9sdX_ig2NIJeRBhABCpYBCpEBCAQQABqGATCBgwKBgGB4d6eLGUBv-Q6EPLehC4S-yuE2HB-_rJ7WkeYwyp-xIPolPrd-PQme2utHB4ZgpXHIu_OFksDe_0bPgZniNRSVRbl7W49DgS5Ya3kMfrYB4DnF5Fta5tn1oV6EwxYD4JONpFTenOJALPGTPawxXEfon_peiHOSBuQMu3_Vn-l1IJiRBhADCpcBCpIBCAUQABqHATCBhAKBgQCTJMKIfmfeZpaI7Q9rnsc29gdWawK7TnpVKRHws1iY7EUlYROeVcMdAwEqVM6f8BVCKLGgzQ7Gar_uuxfUGKwqEQzoppDraw4F75J464-7D5f6_oJQuGIBHZxqbMONtLjBCXRUhQW5szBLmTQ_R3qaJb5vf-h0APZfkYhq1cTttSCZkQYQBAqWAQqRAQgLEAAahgEwgYMCgYBvvGVH_M2H8qxxv94yaDYUTWbRnJ1uiIYc59KIQlfFimMPhSS7x2tqUa2-hI55JiII0Xym6GNkwLhyc1xtWChpVuIdSnbvttbrt4weDMLHqTwNOF6qAsVKGKT1Yh8yf-qb-DSmicgvFc74mBQm_6gAY1iQsf33YX8578ClhKBWHSCVkQYQAAqXAQqSAQgMEAAahwEwgYQCgYEAkuzFcd5TJu7lYWYe2hQLFfUWIIj91BvQQLa_Thln4YtGCO8gG1KJqJm-YlmJOWQG0B7H_5RVhxUxV9KpmFnsDVkzUFKOsCBaYGXc12xPVioawUlAwp5qp3QQtZyx_se97YIoLzuLr46UkLcLnkIrp-Jo46QzYi_QHq45WTm8MQ0glpEGEAIKlwEKkgEIDRAAGocBMIGEAoGBAIUzbxOknXf_rNt17_ir8JlWvrtnCWsQd1MAnl5mgArvavDtKeBYHzi5_Ak7DHlLzuA6YE8W175FxLFKpN2hkz-l-M7ltUSd8N1BvJRhK4t6WffWfC_1wPyoAbeSN2Yb1jygtZJQ8wGoXHcJQUXiMit3eFNyylwsJFj1gzAR4JCdIJeRBhABCpYBCpEBCA4QABqGATCBgwKBgFMcbEpl9ukVR6AO_R6sMyiU11I8b8MBSUCEC15iKsrVO8v_m47_TRRjWPYtQ9eZ7o1ocNJHaGUU7qqInFqtFaVnIceP6NmCsXhjs3MLrWPS8IRAy4Zf4FKmGOx3N9O2vemjUygZ9vUiSkULdVrecinRaT8JQ5RG4bUMY04XGIwFIJiRBhADCpYBCpEBCA8QABqGATCBgwKBgGpCkW-NR3li8GlRvqpq2YZGSIgm_PTyDI2Zwfw69grsBmPpVFW48Vw7xoMN35zcrojEpialB_uQzlpLYOvsMl634CRIuj-n1QE3-gaZTTTE8mg-AR4mcxnTKThPnRQpbuOlYAnriwiasWiQEMbGjq_HmWioYYxFo9USlklQn4-9IJmRBhAEEpUBCpIBCAYQABqHATCBhAKBgQCoZkFGm9oLTqjeXZAq6j5S6i7K20V0lNdBBLqfmFBIRuTkYxhs4vUYnWjZrKRAd5bp6_py0csmFmpl_5Yh0b-2pdo_E5PNP7LGRzKyKSiFddyykKKzVOazH8YYldDAfE8Z5HoS9e48an5JsPg0jr-TPu34DnJq3yv2a6dqiKL9zSCakQYSlQEKkgEIEBAAGocBMIGEAoGBALhrihbf3EpjDQS2sCQHazoFgN0nBbE9eesnnFTfzQELXb2gnJU9enmV_aDqaHKjgtLIPpCgn40lHrn5k6mvH5OdedyI6cCzE-N-GFp3nAq0NDJyMe0fhtIRD__CbT0ulcvkeow65ubXWfw6dBC2gR_34rdMe_L_TGRLMWjDULbNIJ";
+    static const TString UNSUPPORTED_VERSION_USER_TICKET = "2:user:CA0Q__________9_GiQKAwjIAwoCCHsQyAMaCGJiOnNlc3MxGghiYjpzZXNzMiASKAE:KJFv5EcXn9krYk19LCvlFrhMW-R4q8mKfXJXCd-RBVBgUQzCOR1Dx2FiOyU-BxUoIsaU0PiwTjbVY5I2onJDilge70Cl5zEPI9pfab2qwklACq_ZBUvD1tzrfNUr88otBGAziHASJWgyVDkhyQ3p7YbN38qpb0vGQrYNxlk4e2I";
+    static const TString USER_TICKET_PROTOBUF = "CA0Q__________9_GiQKAwjIAwoCCHsQyAMaCGJiOnNlc3MxGghiYjpzZXNzMiASKAE";
+    static const TString VALID_USER_TICKET_1 = "3:user:CA0Q__________9_GiQKAwjIAwoCCHsQyAMaCGJiOnNlc3MxGghiYjpzZXNzMiASKAE:KJFv5EcXn9krYk19LCvlFrhMW-R4q8mKfXJXCd-RBVBgUQzCOR1Dx2FiOyU-BxUoIsaU0PiwTjbVY5I2onJDilge70Cl5zEPI9pfab2qwklACq_ZBUvD1tzrfNUr88otBGAziHASJWgyVDkhyQ3p7YbN38qpb0vGQrYNxlk4e2I";
+    static const TString VALID_USER_TICKET_2 = "3:user:CA0Q__________9_GhAKAwjIAwoCCHsQyAMgEigB:KRibGYTJUA2ns0Fn7VYqeMZ1-GdscB1o9pRzELyr7QJrJsfsE8Y_HoVvB8Npr-oalv6AXOpagSc8HpZjAQz8zKMAVE_tI0tL-9DEsHirpawEbpy7OWV7-k18o1m-RaDaKeTlIB45KHbBul1-9aeKkortBfbbXtz_Qy9r_mfFPiQ";
+    static const TString VALID_USER_TICKET_3 = "3:user:CA0Q__________9_Go8bCgIIAAoCCAEKAggCCgIIAwoCCAQKAggFCgIIBgoCCAcKAggICgIICQoCCAoKAggLCgIIDAoCCA0KAggOCgIIDwoCCBAKAggRCgIIEgoCCBMKAggUCgIIFQoCCBYKAggXCgIIGAoCCBkKAggaCgIIGwoCCBwKAggdCgIIHgoCCB8KAgggCgIIIQoCCCIKAggjCgIIJAoCCCUKAggmCgIIJwoCCCgKAggpCgIIKgoCCCsKAggsCgIILQoCCC4KAggvCgIIMAoCCDEKAggyCgIIMwoCCDQKAgg1CgIINgoCCDcKAgg4CgIIOQoCCDoKAgg7CgIIPAoCCD0KAgg-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_AQoDCMABCgMIwQEKAwjCAQoDCMMBCgMIxAEKAwjFAQoDCMYBCgMIxwEKAwjIAQoDCMkBCgMIygEKAwjLAQoDCMwBCgMIzQEKAwjOAQoDCM8BCgMI0AEKAwjRAQoDCNIBCgMI0wEKAwjUAQoDCNUBCgMI1gEKAwjXAQoDCNgBCgMI2QEKAwjaAQoDCNsBCgMI3AEKAwjdAQoDCN4BCgMI3wEKAwjgAQoDCOEBCgMI4gEKAwjjAQoDCOQBCgMI5QEKAwjmAQoDCOcBCgMI6AEKAwjpAQoDCOoBCgMI6wEKAwjsAQoDCO0BCgMI7gEKAwjvAQoDCPABCgMI8QEKAwjyAQoDCPMBCgMI9AEKAwj1AQoDCPYBCgMI9wEKAwj4AQoDCPkBCgMI-gEKAwj7AQoDCPwBCgMI_QEKAwj-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-AIKAwj5AgoDCPoCCgMI-wIKAwj8AgoDCP0CCgMI_gIKAwj_AgoDCIADCgMIgQMKAwiCAwoDCIMDCgMIhAMKAwiFAwoDCIYDCgMIhwMKAwiIAwoDCIkDCgMIigMKAwiLAwoDCIwDCgMIjQMKAwiOAwoDCI8DCgMIkAMKAwiRAwoDCJIDCgMIkwMKAwiUAwoDCJUDCgMIlgMKAwiXAwoDCJgDCgMImQMKAwiaAwoDCJsDCgMInAMKAwidAwoDCJ4DCgMInwMKAwigAwoDCKEDCgMIogMKAwijAwoDCKQDCgMIpQMKAwimAwoDCKcDCgMIqAMKAwipAwoDCKoDCgMIqwMKAwisAwoDCK0DCgMIrgMKAwivAwoDCLADCgMIsQMKAwiyAwoDCLMDCgMItAMKAwi1AwoDCLYDCgMItwMKAwi4AwoDCLkDCgMIugMKAwi7AwoDCLwDCgMIvQMKAwi-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:CX8PIOrxJnQqFXl7wAsiHJ_1VGjoI-asNlCXb8SE8jtI2vdh9x6CqbAurSgIlAAEgotVP-nuUR38x_a9YJuXzmG5AvJ458apWQtODHIDIX6ZaIwMxjS02R7S5LNqXa0gAuU_R6bCWpZdWe2uLMkdpu5KHbDgW08g-uaP_nceDOk";
+
+    Y_UNIT_TEST(Case1Test) {
+        TUserContext context1(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+
+        TCheckedUserTicket checkedTicket1 = context1.Check("2:serv:CgYIDRCUkQYQDBgcIgdiYjpzZXNzIghiYjpzZXNzMg:ERmeH_yzC7K_QsoHTyw7llCsyExEz3CoEopPIuivA0ZAtTaFq_Pa0l9Fhhx_NX9WpOp2CPyY5cFc4PXhcO83jCB7-EGvHNxGN-j2NQalERzPiKqkDCO0Q5etLzSzrfTlvMz7sXDvELNBHyA0PkAQnbz4supY0l-0Q6JBYSEF3zOVMjjE-HeQIFL3ats3_PakaUMWRvgQQ88pVdYZqAtbDw9PlTla7ommygVZQjcfNFXV1pJKRgOCLs-YyCjOJHLKL04zYj0X6KsOCTUeqhj7ml96wLZ-g1X9tyOR2WAr2Ctq7wIEHwqhxOLgOSKqm05xH6Vi3E_hekf50oe2jPfKEA");
+        UNIT_ASSERT_EQUAL(ETicketStatus::UnsupportedVersion, checkedTicket1.GetStatus());
+        UNIT_ASSERT(!checkedTicket1);
+
+        TUserContext context2 = std::move(context1);
+        TUserContext context3(std::move(context2));
+        TCheckedUserTicket checkedTicket2 = context3.Check(VALID_USER_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket2.GetStatus());
+        TCheckedUserTicket checkedTicket3 = std::move(checkedTicket2);
+        TCheckedUserTicket checkedTicket4(std::move(checkedTicket3));
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket4.GetStatus());
+    }
+
+    Y_UNIT_TEST(ContextTest) {
+        TUserContext context(EBlackboxEnv::Prod, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+    }
+
+    Y_UNIT_TEST(ContextExceptionsTest) {
+        UNIT_ASSERT_EXCEPTION(TUserContext(EBlackboxEnv::Prod, EMPTY_TVM_KEYS), TEmptyTvmKeysException);
+        UNIT_ASSERT_EXCEPTION(TUserContext(EBlackboxEnv::Prod, MALFORMED_TVM_KEYS), TMalformedTvmKeysException);
+    }
+
+    Y_UNIT_TEST(Ticket1Test) {
+        TUserContext context(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_USER_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket.GetStatus());
+        UNIT_ASSERT_EQUAL(TUids({456, 123}), checkedTicket.GetUids());
+        UNIT_ASSERT_EQUAL(456, checkedTicket.GetDefaultUid());
+        UNIT_ASSERT_EQUAL(TScopes({"bb:sess1", "bb:sess2"}), checkedTicket.GetScopes());
+        UNIT_ASSERT(checkedTicket.HasScope("bb:sess1"));
+        UNIT_ASSERT(checkedTicket.HasScope("bb:sess2"));
+        UNIT_ASSERT(!checkedTicket.HasScope("bb:sess3"));
+        UNIT_ASSERT_EQUAL("ticket_type=user;expiration_time=9223372036854775807;scope=bb:sess1;scope=bb:sess2;default_uid=456;uid=456;uid=123;env=Test;", checkedTicket.DebugInfo());
+    }
+
+    Y_UNIT_TEST(Ticket2Test) {
+        TUserContext context(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_USER_TICKET_2);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket.GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=user;expiration_time=9223372036854775807;default_uid=456;uid=456;uid=123;env=Test;", checkedTicket.DebugInfo());
+    }
+
+    Y_UNIT_TEST(Ticket3Test) {
+        TUserContext context(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_USER_TICKET_3);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket.GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=user;expiration_time=9223372036854775807;scope=bb:sess1;scope=bb:sess10;scope=bb:sess100;scope=bb:sess11;scope=bb:sess12;scope=bb:sess13;scope=bb:sess14;scope=bb:sess15;scope=bb:sess16;scope=bb:sess17;scope=bb:sess18;scope=bb:sess19;scope=bb:sess2;scope=bb:sess20;scope=bb:sess21;scope=bb:sess22;scope=bb:sess23;scope=bb:sess24;scope=bb:sess25;scope=bb:sess26;scope=bb:sess27;scope=bb:sess28;scope=bb:sess29;scope=bb:sess3;scope=bb:sess30;scope=bb:sess31;scope=bb:sess32;scope=bb:sess33;scope=bb:sess34;scope=bb:sess35;scope=bb:sess36;scope=bb:sess37;scope=bb:sess38;scope=bb:sess39;scope=bb:sess4;scope=bb:sess40;scope=bb:sess41;scope=bb:sess42;scope=bb:sess43;scope=bb:sess44;scope=bb:sess45;scope=bb:sess46;scope=bb:sess47;scope=bb:sess48;scope=bb:sess49;scope=bb:sess5;scope=bb:sess50;scope=bb:sess51;scope=bb:sess52;scope=bb:sess53;scope=bb:sess54;scope=bb:sess55;scope=bb:sess56;scope=bb:sess57;scope=bb:sess58;scope=bb:sess59;scope=bb:sess6;scope=bb:sess60;scope=bb:sess61;scope=bb:sess62;scope=bb:sess63;scope=bb:sess64;scope=bb:sess65;scope=bb:sess66;scope=bb:sess67;scope=bb:sess68;scope=bb:sess69;scope=bb:sess7;scope=bb:sess70;scope=bb:sess71;scope=bb:sess72;scope=bb:sess73;scope=bb:sess74;scope=bb:sess75;scope=bb:sess76;scope=bb:sess77;scope=bb:sess78;scope=bb:sess79;scope=bb:sess8;scope=bb:sess80;scope=bb:sess81;scope=bb:sess82;scope=bb:sess83;scope=bb:sess84;scope=bb:sess85;scope=bb:sess86;scope=bb:sess87;scope=bb:sess88;scope=bb:sess89;scope=bb:sess9;scope=bb:sess90;scope=bb:sess91;scope=bb:sess92;scope=bb:sess93;scope=bb:sess94;scope=bb:sess95;scope=bb:sess96;scope=bb:sess97;scope=bb:sess98;scope=bb:sess99;default_uid=456;uid=0;uid=1;uid=2;uid=3;uid=4;uid=5;uid=6;uid=7;uid=8;uid=9;uid=10;uid=11;uid=12;uid=13;uid=14;uid=15;uid=16;uid=17;uid=18;uid=19;uid=20;uid=21;uid=22;uid=23;uid=24;uid=25;uid=26;uid=27;uid=28;uid=29;uid=30;uid=31;uid=32;uid=33;uid=34;uid=35;uid=36;uid=37;uid=38;uid=39;uid=40;uid=41;uid=42;uid=43;uid=44;uid=45;uid=46;uid=47;uid=48;uid=49;uid=50;uid=51;uid=52;uid=53;uid=54;uid=55;uid=56;uid=57;uid=58;uid=59;uid=60;uid=61;uid=62;uid=63;uid=64;uid=65;uid=66;uid=67;uid=68;uid=69;uid=70;uid=71;uid=72;uid=73;uid=74;uid=75;uid=76;uid=77;uid=78;uid=79;uid=80;uid=81;uid=82;uid=83;uid=84;uid=85;uid=86;uid=87;uid=88;uid=89;uid=90;uid=91;uid=92;uid=93;uid=94;uid=95;uid=96;uid=97;uid=98;uid=99;uid=100;uid=101;uid=102;uid=103;uid=104;uid=105;uid=106;uid=107;uid=108;uid=109;uid=110;uid=111;uid=112;uid=113;uid=114;uid=115;uid=116;uid=117;uid=118;uid=119;uid=120;uid=121;uid=122;uid=123;uid=124;uid=125;uid=126;uid=127;uid=128;uid=129;uid=130;uid=131;uid=132;uid=133;uid=134;uid=135;uid=136;uid=137;uid=138;uid=139;uid=140;uid=141;uid=142;uid=143;uid=144;uid=145;uid=146;uid=147;uid=148;uid=149;uid=150;uid=151;uid=152;uid=153;uid=154;uid=155;uid=156;uid=157;uid=158;uid=159;uid=160;uid=161;uid=162;uid=163;uid=164;uid=165;uid=166;uid=167;uid=168;uid=169;uid=170;uid=171;uid=172;uid=173;uid=174;uid=175;uid=176;uid=177;uid=178;uid=179;uid=180;uid=181;uid=182;uid=183;uid=184;uid=185;uid=186;uid=187;uid=188;uid=189;uid=190;uid=191;uid=192;uid=193;uid=194;uid=195;uid=196;uid=197;uid=198;uid=199;uid=200;uid=201;uid=202;uid=203;uid=204;uid=205;uid=206;uid=207;uid=208;uid=209;uid=210;uid=211;uid=212;uid=213;uid=214;uid=215;uid=216;uid=217;uid=218;uid=219;uid=220;uid=221;uid=222;uid=223;uid=224;uid=225;uid=226;uid=227;uid=228;uid=229;uid=230;uid=231;uid=232;uid=233;uid=234;uid=235;uid=236;uid=237;uid=238;uid=239;uid=240;uid=241;uid=242;uid=243;uid=244;uid=245;uid=246;uid=247;uid=248;uid=249;uid=250;uid=251;uid=252;uid=253;uid=254;uid=255;uid=256;uid=257;uid=258;uid=259;uid=260;uid=261;uid=262;uid=263;uid=264;uid=265;uid=266;uid=267;uid=268;uid=269;uid=270;uid=271;uid=272;uid=273;uid=274;uid=275;uid=276;uid=277;uid=278;uid=279;uid=280;uid=281;uid=282;uid=283;uid=284;uid=285;uid=286;uid=287;uid=288;uid=289;uid=290;uid=291;uid=292;uid=293;uid=294;uid=295;uid=296;uid=297;uid=298;uid=299;uid=300;uid=301;uid=302;uid=303;uid=304;uid=305;uid=306;uid=307;uid=308;uid=309;uid=310;uid=311;uid=312;uid=313;uid=314;uid=315;uid=316;uid=317;uid=318;uid=319;uid=320;uid=321;uid=322;uid=323;uid=324;uid=325;uid=326;uid=327;uid=328;uid=329;uid=330;uid=331;uid=332;uid=333;uid=334;uid=335;uid=336;uid=337;uid=338;uid=339;uid=340;uid=341;uid=342;uid=343;uid=344;uid=345;uid=346;uid=347;uid=348;uid=349;uid=350;uid=351;uid=352;uid=353;uid=354;uid=355;uid=356;uid=357;uid=358;uid=359;uid=360;uid=361;uid=362;uid=363;uid=364;uid=365;uid=366;uid=367;uid=368;uid=369;uid=370;uid=371;uid=372;uid=373;uid=374;uid=375;uid=376;uid=377;uid=378;uid=379;uid=380;uid=381;uid=382;uid=383;uid=384;uid=385;uid=386;uid=387;uid=388;uid=389;uid=390;uid=391;uid=392;uid=393;uid=394;uid=395;uid=396;uid=397;uid=398;uid=399;uid=400;uid=401;uid=402;uid=403;uid=404;uid=405;uid=406;uid=407;uid=408;uid=409;uid=410;uid=411;uid=412;uid=413;uid=414;uid=415;uid=416;uid=417;uid=418;uid=419;uid=420;uid=421;uid=422;uid=423;uid=424;uid=425;uid=426;uid=427;uid=428;uid=429;uid=430;uid=431;uid=432;uid=433;uid=434;uid=435;uid=436;uid=437;uid=438;uid=439;uid=440;uid=441;uid=442;uid=443;uid=444;uid=445;uid=446;uid=447;uid=448;uid=449;uid=450;uid=451;uid=452;uid=453;uid=454;uid=455;uid=456;uid=457;uid=458;uid=459;uid=460;uid=461;uid=462;uid=463;uid=464;uid=465;uid=466;uid=467;uid=468;uid=469;uid=470;uid=471;uid=472;uid=473;uid=474;uid=475;uid=476;uid=477;uid=478;uid=479;uid=480;uid=481;uid=482;uid=483;uid=484;uid=485;uid=486;uid=487;uid=488;uid=489;uid=490;uid=491;uid=492;uid=493;uid=494;uid=495;uid=496;uid=497;uid=498;uid=499;env=Test;", checkedTicket.DebugInfo());
+    }
+
+    Y_UNIT_TEST(TicketErrorsTest) {
+        TUserContext contextTest(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket1 = contextTest.Check(UNSUPPORTED_VERSION_USER_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::UnsupportedVersion, checkedTicket1.GetStatus());
+
+        auto checkedTicket2 = contextTest.Check(EXPIRED_USER_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Expired, checkedTicket2.GetStatus());
+
+        TUserContext contextProd(EBlackboxEnv::Prod, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket3 = contextProd.Check(VALID_USER_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::InvalidBlackboxEnv, checkedTicket3.GetStatus());
+    }
+
+    Y_UNIT_TEST(TicketExceptionsTest) {
+        TUserContext contextTest(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = contextTest.Check(EXPIRED_USER_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Expired, checkedTicket.GetStatus());
+
+        UNIT_ASSERT_EXCEPTION(checkedTicket.GetDefaultUid(), TNotAllowedException);
+        UNIT_ASSERT_EXCEPTION(checkedTicket.GetUids(), TNotAllowedException);
+        UNIT_ASSERT_EXCEPTION(checkedTicket.GetScopes(), TNotAllowedException);
+        UNIT_ASSERT_EXCEPTION(checkedTicket.HasScope(""), TNotAllowedException);
+        UNIT_ASSERT_NO_EXCEPTION(bool(checkedTicket));
+        UNIT_ASSERT_NO_EXCEPTION(checkedTicket.DebugInfo());
+        UNIT_ASSERT_NO_EXCEPTION(checkedTicket.GetStatus());
+    }
+
+    Y_UNIT_TEST(ResetKeysTest) {
+        TUserContext context(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_USER_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket.GetStatus());
+    }
+}
diff --git a/library/cpp/tvmauth/src/ut/service_ut.cpp b/library/cpp/tvmauth/src/ut/service_ut.cpp
new file mode 100644
index 0000000000..5b6b5143bd
--- /dev/null
+++ b/library/cpp/tvmauth/src/ut/service_ut.cpp
@@ -0,0 +1,156 @@
+#include <library/cpp/tvmauth/src/service_impl.h>
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <library/cpp/tvmauth/exception.h>
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/string/cast.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ServiceTestSuite) {
+    Y_UNIT_TEST_DECLARE(TicketProtoTest);
+}
+
+class TTestServiceTicketImpl: public TCheckedServiceTicket::TImpl {
+    using TCheckedServiceTicket::TImpl::TImpl;
+    Y_UNIT_TEST_FRIEND(ServiceTestSuite, TicketProtoTest);
+};
+
+Y_UNIT_TEST_SUITE_IMPLEMENTATION(ServiceTestSuite) {
+    static const TString EMPTY_TVM_KEYS = "1:CpgCCpMCCAEQABqIAjCCAQQCggEAcLEXeH67FQESFUn4_7wnX7wN0PUrBoUsm3QQ4W5vC-qz6sXaEjSwnTV8w1o-z6X9KPLlhzMQvuS38NCNfK4uvJ4Zvfp3YsXJ25-rYtbnrYJHNvHohD-kPCCw_yZpMp21JdWigzQGuV7CtrxUhF-NNrsnUaJrE5-OpEWNt4X6nCItKIYeVcSK6XJUbEWbrNCRbvkSc4ak2ymFeMuHYJVjxh4eQbk7_ZPzodP0WvF6eUYrYeb42imVEOR8ofVLQWE5DVnb1z_TqZm4i1XkS7jMwZuBxBRw8DGdYei0lT_sAf7KST2jC0590NySB3vsBgWEVs1OdUUWA6r-Dvx9dsOQtSCVkQYQAAqZAgqUAggCEAAaiQIwggEFAoIBAQDhEBM5-6YsPWfogKtbluJoCX1WV2KdzOaQ0-OlRbBzeCzw-eQKu12c8WakHBbeCMd1I1TU64SDkDorWjXGIa_2xT6N3zzNAE50roTbPCcmeQrps26woTYfYIuqDdoxYKZNr0lvNLLW47vBr7EKqo1S4KSj7aXK_XYeEvUgIgf3nVIcNrio7VTnFmGGVQCepaL1Hi1gN4yIXjVZ06PBPZ-DxSRu6xOGbFrfKMJeMPs7KOyE-26Q3xOXdTIa1X-zYIucTd_bxUCL4BVbwW2AvbbFsaG7ISmVdGu0XUTmhXs1KrEfUVLRJhE4Dx99hAZXm1_HlYMUeJcMQ_oHOhV94ENFIJaRBhACCpYBCpEBCAMQABqGATCBgwKBgF9t2YJGAJkRRFq6fWhi3m1TFW1UOE0f6ZrfYhHAkpqGlKlh0QVfeTNPpeJhi75xXzCe6oReRUm-0DbqDNhTShC7uGUv1INYnRBQWH6E-5Fc5XrbDFSuGQw2EYjNfHy_HefHJXxQKAqPvxBDKMKkHgV58WtM6rC8jRi9sdX_ig2NIJeRBhABCpYBCpEBCAQQABqGATCBgwKBgGB4d6eLGUBv-Q6EPLehC4S-yuE2HB-_rJ7WkeYwyp-xIPolPrd-PQme2utHB4ZgpXHIu_OFksDe_0bPgZniNRSVRbl7W49DgS5Ya3kMfrYB4DnF5Fta5tn1oV6EwxYD4JONpFTenOJALPGTPawxXEfon_peiHOSBuQMu3_Vn-l1IJiRBhADCpcBCpIBCAUQABqHATCBhAKBgQCTJMKIfmfeZpaI7Q9rnsc29gdWawK7TnpVKRHws1iY7EUlYROeVcMdAwEqVM6f8BVCKLGgzQ7Gar_uuxfUGKwqEQzoppDraw4F75J464-7D5f6_oJQuGIBHZxqbMONtLjBCXRUhQW5szBLmTQ_R3qaJb5vf-h0APZfkYhq1cTttSCZkQYQBAqWAQqRAQgLEAAahgEwgYMCgYBvvGVH_M2H8qxxv94yaDYUTWbRnJ1uiIYc59KIQlfFimMPhSS7x2tqUa2-hI55JiII0Xym6GNkwLhyc1xtWChpVuIdSnbvttbrt4weDMLHqTwNOF6qAsVKGKT1Yh8yf-qb-DSmicgvFc74mBQm_6gAY1iQsf33YX8578ClhKBWHSCVkQYQAAqXAQqSAQgMEAAahwEwgYQCgYEAkuzFcd5TJu7lYWYe2hQLFfUWIIj91BvQQLa_Thln4YtGCO8gG1KJqJm-YlmJOWQG0B7H_5RVhxUxV9KpmFnsDVkzUFKOsCBaYGXc12xPVioawUlAwp5qp3QQtZyx_se97YIoLzuLr46UkLcLnkIrp-Jo46QzYi_QHq45WTm8MQ0glpEGEAIKlwEKkgEIDRAAGocBMIGEAoGBAIUzbxOknXf_rNt17_ir8JlWvrtnCWsQd1MAnl5mgArvavDtKeBYHzi5_Ak7DHlLzuA6YE8W175FxLFKpN2hkz-l-M7ltUSd8N1BvJRhK4t6WffWfC_1wPyoAbeSN2Yb1jygtZJQ8wGoXHcJQUXiMit3eFNyylwsJFj1gzAR4JCdIJeRBhABCpYBCpEBCA4QABqGATCBgwKBgFMcbEpl9ukVR6AO_R6sMyiU11I8b8MBSUCEC15iKsrVO8v_m47_TRRjWPYtQ9eZ7o1ocNJHaGUU7qqInFqtFaVnIceP6NmCsXhjs3MLrWPS8IRAy4Zf4FKmGOx3N9O2vemjUygZ9vUiSkULdVrecinRaT8JQ5RG4bUMY04XGIwFIJiRBhADCpYBCpEBCA8QABqGATCBgwKBgGpCkW-NR3li8GlRvqpq2YZGSIgm_PTyDI2Zwfw69grsBmPpVFW48Vw7xoMN35zcrojEpialB_uQzlpLYOvsMl634CRIuj-n1QE3-gaZTTTE8mg-AR4mcxnTKThPnRQpbuOlYAnriwiasWiQEMbGjq_HmWioYYxFo9USlklQn4-9IJmRBhAE";
+    static const TString EXPIRED_SERVICE_TICKET = "3:serv:CBAQACIZCOUBEBwaCGJiOnNlc3MxGghiYjpzZXNzMg:IwfMNJYEqStY_SixwqJnyHOMCPR7-3HHk4uylB2oVRkthtezq-OOA7QizDvx7VABLs_iTlXuD1r5IjufNei_EiV145eaa3HIg4xCdJXCojMexf2UYJz8mF2b0YzFAy6_KWagU7xo13CyKAqzJuQf5MJcSUf0ecY9hVh36cJ51aw";
+    static const TString MALFORMED_TVM_KEYS = "1:CpgCCpMCCAEQABqIAjCCAQQCggEAcLEXeH67FQESFUn4_7wnX7wN0PUrBoUsm3QQ4W5vC-qz6sXaEjSwnTV8w1o-z6X9KPLlhzMQvuS38NCNfK4uvJ4Zvfp3YsXJ25-rYtbnrYJHNvHohD-kPCCw_yZpMp21JdWigzQGuV7CtrxUhF-NNrsnUaJrE5-OpEWNt4X6nCItKIYeVcSK6XJUbEWbrNCRbvkSc4ak2ymFeMuHYJVjxh4eQbk7_ZPzodP0WvF6eUYrYeb42imVEOR8ofVLQWE5DVnb1z_TqZm4i1XkS7jMwZuBxBRw8DGdYei0lT_sAf7KST2jC0590NySB3vsBgWEVs1OdUUWA6r-Dvx9dsOQtSCVkQYQAAqZAgqUAggCEAAaiQIwggEFAoIBAQDhEBM5-6YsPWfogKtbluJoCX1WV2KdzOaQ0-OlRbBzeCzw-eQKu12c8WakHBbeCMd1I1TU64SDkDorWjXGIa_2xT6N3zzNAE50roTbPCcmeQrps26woTYfYIuqDdoxYKZNr0lvNLLW47vBr7EKqo1S4KSj7aXK_XYeEvUgIgf3nVIcNrio7VTnFmGGVQCepaL1Hi1gN4yIXjVZ06PBPZ-DxSRu6xOGbFrfKMJeMPs7KOyE-26Q3xOXdTIa1X-zYIucTd_bxUCL4BVbwW2AvbbFsaG7ISmVdGu0XUTmhXs1KrEfUVLRJhE4Dx99hAZXm1_HlYMUeJcMQ_oHOhV94ENFIJaRBhACCpYBCpEBCAMQABqGATCBgwKBgF9t2YJGAJkRRFq6fWhi3m1TFW1UOE0f6ZrfYhHAkpqGlKlh0QVfeTNPpeJhi75xXzCe6oReRUm-0DbqDNhTShC7uGUv1INYnRBQWH6E-5Fc5XrbDFSuGQw2EYjNfHy_HefHJXxQKAqPvxBDKMKkHgV58WtM6rC8jRi9sdX_ig2NIJeRBhABCpYBCpEBCAQQABqGATCBgwKBgGB4d6eLGUBv-Q6EPLehC4S-yuE2HB-_rJ7WkeYwyp-xIPolPrd-PQme2utHB4ZgpXHIu_OFksDe_0bPgZniNRSVRbl7W49DgS5Ya3kMfrYB4DnF5Fta5tn1oV6EwxYD4JONpFTenOJALPGTPawxXEfon_peiHOSBuQMu3_Vn-l1IJiRBhADCpcBCpIBCAUQABqHATCBhAKBgQCTJMKIfmfeZpaI7Q9rnsc29gdWawK7TnpVKRHws1iY7EUlYROeVcMdAwEqVM6f8BVCKLGgzQ7Gar_uuxfUGKwqEQzoppDraw4F75J464-7D5f6_oJQuGIBHZxqbMONtLjBCXRUhQW5szBLmTQ_R3qaJb5vf-h0APZfkYhq1cTttSCZkQYQBAqWAQqRAQgLEAAahgEwgYMCgYBvvGVH_M2H8qxxv94yaDYUTWbRnJ1uiIYc59KIQlfFimMPhSS7x2tqUa2-hI55JiII0Xym6GNkwLhyc1xtWChpVuIdSnbvttbrt4weDMLHqTwNOF6qAsVKGKT1Yh8yf-qb-DSmicgvFc74mBQm_6gAY1iQsf33YX8578ClhKBWHSCVkQYQAAqXAQqSAQgMEAAahwEwgYQCgYEAkuzFcd5TJu7lYWYe2hQLFfUWIIj91BvQQLa_Thln4YtGCO8gG1KJqJm-YlmJOWQG0B7H_5RVhxUxV9KpmFnsDVkzUFKOsCBaYGXc12xPVioawUlAwp5qp3QQtZyx_se97YIoLzuLr46UkLcLnkIrp-Jo46QzYi_QHq45WTm8MQ0glpEGEAIKlwEKkgEIDRAAGocBMIGEAoGBAIUzbxOknXf_rNt17_ir8JlWvrtnCWsQd1MAnl5mgArvavDtKeBYHzi5_Ak7DHlLzuA6YE8W175FxLFKpN2hkz-l-M7ltUSd8N1BvJRhK4t6WffWfC_1wPyoAbeSN2Yb1jygtZJQ8wGoXHcJQUXiMit3eFNyylwsJFj1gzAR4JCdIJeRBhABCpYBCpEBCA4QABqGATCBgwKBgFMcbEpl9ukVR6AO_R6sMyiU11I8b8MBSUCEC15iKsrVO8v_m47_TRRjWPYtQ9eZ7o1ocNJHaGUU7qqInFqtFaVnIceP6NmCsXhjs3MLrWPS8IRAy4Zf4FKmGOx3N9O2vemjUygZ9vUiSkULdVrecinRaT8JQ5RG4bUMY04XGIwFIJiRBhADCpYBCpEBCA8QABqGATCBgwKBgGpCkW-NR3li8GlRvqpq2YZGSIgm_PTyDI2Zwfw69grsBmPpVFW48Vw7xoMN35zcrojEpialB_uQzlpLYOvsMl634CRIuj-n1QE3-gaZTTTE8mg-AR4mcxnTKThPnRQpbuOlYAnriwiasWiQEMbGjq_HmWioYYxFo9USlklQn4-9IJmRBhAEEpUBCpIBCAYQABqHATCBhAKBgQCoZkFGm9oLTqjeXZAq6j5S6i7K20V0lNdBBLqfmFBIRuTkYxhs4vUYnWjZrKRAd5bp6_py0csmFmpl_5Yh0b-2pdo_E5PNP7LGRzKyKSiFddyykKKzVOazH8YYldDAfE8Z5HoS9e48an5JsPg0jr-TPu34DnJq3yv2a6dqiKL9zSCakQYSlQEKkgEIEBAAGocBMIGEAoGBALhrihbf3EpjDQS2sCQHazoFgN0nBbE9eesnnFTfzQELXb2gnJU9enmV_aDqaHKjgtLIPpCgn40lHrn5k6mvH5OdedyI6cCzE-N-GFp3nAq0NDJyMe0fhtIRD__CbT0ulcvkeow65ubXWfw6dBC2gR_34rdMe_L_TGRLMWjDULbNIJ";
+    static const TString MALFORMED_TVM_SECRET = "adcvxcv./-+";
+    static const TTvmId NOT_OUR_ID = 27;
+    static const TTvmId OUR_ID = 28;
+    static const TString SECRET = "GRMJrKnj4fOVnvOqe-WyD1";
+    static const TString SERVICE_TICKET_PROTOBUF = "CBAQ__________9_IhkI5QEQHBoIYmI6c2VzczEaCGJiOnNlc3My";
+    static const TTvmId SRC_ID = 229;
+    static const TString UNSUPPORTED_VERSION_SERVICE_TICKET = "2:serv:CBAQ__________9_IhkI5QEQHBoIYmI6c2VzczEaCGJiOnNlc3My:WUPx1cTf05fjD1exB35T5j2DCHWH1YaLJon_a4rN-D7JfXHK1Ai4wM4uSfboHD9xmGQH7extqtlEk1tCTCGm5qbRVloJwWzCZBXo3zKX6i1oBYP_89WcjCNPVe1e8jwGdLsnu6PpxL5cn0xCksiStILH5UmDR6xfkJdnmMG94o8";
+    static const TString VALID_SERVICE_TICKET_1 = "3:serv:CBAQ__________9_IhkI5QEQHBoIYmI6c2VzczEaCGJiOnNlc3My:WUPx1cTf05fjD1exB35T5j2DCHWH1YaLJon_a4rN-D7JfXHK1Ai4wM4uSfboHD9xmGQH7extqtlEk1tCTCGm5qbRVloJwWzCZBXo3zKX6i1oBYP_89WcjCNPVe1e8jwGdLsnu6PpxL5cn0xCksiStILH5UmDR6xfkJdnmMG94o8";
+    static const TString VALID_SERVICE_TICKET_2 = "3:serv:CBAQ__________9_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:JYmABAVLM6y7_T4n1pRcwBfwDfzMV4JJ3cpbEG617zdGgKRZwL7MalsYn5bq1F2ibujMrsF9nzZf8l4s_e-Ivjkz_xu4KMzSp-pUh9V7XIF_smj0WHYpv6gOvWNuK8uIvlZTTKwtQX0qZOL9m-MEeZiHoQPKZGCfJ_qxMUp-J8I";
+    static const TString VALID_SERVICE_TICKET_3 = "3:serv:CBAQ__________9_IgUI5QEQHA:Sd6tmA1CNy2Nf7XevC3x7zr2DrGNRmcl-TxUsDtDW2xI3YXyCxBltWeg0-KtDlqyYuPOP5Jd_-XXNA12KlOPnNzrz3jm-5z8uQl6CjCcrVHUHJ75pGC8r9UOlS8cOgeXQB5dYP-fOWyo5CNadlozx1S2meCIxncbQRV1kCBi4KU";
+    static const TString VALID_SERVICE_TICKET_ISSUER = "3:serv:CBAQ__________9_IgsI5QEQHCDr1MT4Ag:Gu66XJT_nKnIRJjFy1561wFhIqkJItcSTGftLo7Yvi7i5wIdV-QuKT_-IMPpgjxnnGbt1Dy3Ys2TEoeJAb0TdaCYG1uy3vpoLONmTx9AenN5dx1HHf46cypLK5D3OdiTjxvqI9uGmSIKrSdRxU8gprpu5QiBDPZqVCWhM60FVSY";
+
+    Y_UNIT_TEST(ContextExceptionsTest) {
+        UNIT_ASSERT_EXCEPTION(TServiceContext::TImpl(SECRET, OUR_ID, MALFORMED_TVM_KEYS), TMalformedTvmKeysException);
+        UNIT_ASSERT_EXCEPTION(TServiceContext::TImpl(SECRET, OUR_ID, EMPTY_TVM_KEYS), TEmptyTvmKeysException);
+        UNIT_ASSERT_EXCEPTION(TServiceContext::TImpl(MALFORMED_TVM_SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS), TMalformedTvmSecretException);
+    }
+
+    Y_UNIT_TEST(ContextSignTest) {
+        TServiceContext::TImpl context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT_VALUES_EQUAL(
+            "NsPTYak4Cfk-4vgau5lab3W4GPiTtb2etuj3y4MDPrk",
+            context.SignCgiParamsForTvm(IntToString<10>(std::numeric_limits<time_t>::max()), "13,28", ""));
+    }
+
+    Y_UNIT_TEST(Ticket1Test) {
+        TServiceContext::TImpl context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_SERVICE_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket->GetStatus());
+        UNIT_ASSERT_EQUAL(std::numeric_limits<time_t>::max(), checkedTicket->GetExpirationTime());
+        UNIT_ASSERT_EQUAL(SRC_ID, checkedTicket->GetSrc());
+        UNIT_ASSERT_EQUAL(TScopes({"bb:sess1", "bb:sess2"}), checkedTicket->GetScopes());
+        UNIT_ASSERT(checkedTicket->HasScope("bb:sess1"));
+        UNIT_ASSERT(checkedTicket->HasScope("bb:sess2"));
+        UNIT_ASSERT(!checkedTicket->HasScope("bb:sess3"));
+        UNIT_ASSERT_EQUAL("ticket_type=serv;expiration_time=9223372036854775807;src=229;dst=28;scope=bb:sess1;scope=bb:sess2;", checkedTicket->DebugInfo());
+        UNIT_ASSERT(!checkedTicket->GetIssuerUid());
+    }
+
+    Y_UNIT_TEST(Ticket2Test) {
+        TServiceContext::TImpl context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_SERVICE_TICKET_2);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=serv;expiration_time=9223372036854775807;src=229;dst=28;scope=bb:sess1;scope=bb:sess10;scope=bb:sess100;scope=bb:sess11;scope=bb:sess12;scope=bb:sess13;scope=bb:sess14;scope=bb:sess15;scope=bb:sess16;scope=bb:sess17;scope=bb:sess18;scope=bb:sess19;scope=bb:sess2;scope=bb:sess20;scope=bb:sess21;scope=bb:sess22;scope=bb:sess23;scope=bb:sess24;scope=bb:sess25;scope=bb:sess26;scope=bb:sess27;scope=bb:sess28;scope=bb:sess29;scope=bb:sess3;scope=bb:sess30;scope=bb:sess31;scope=bb:sess32;scope=bb:sess33;scope=bb:sess34;scope=bb:sess35;scope=bb:sess36;scope=bb:sess37;scope=bb:sess38;scope=bb:sess39;scope=bb:sess4;scope=bb:sess40;scope=bb:sess41;scope=bb:sess42;scope=bb:sess43;scope=bb:sess44;scope=bb:sess45;scope=bb:sess46;scope=bb:sess47;scope=bb:sess48;scope=bb:sess49;scope=bb:sess5;scope=bb:sess50;scope=bb:sess51;scope=bb:sess52;scope=bb:sess53;scope=bb:sess54;scope=bb:sess55;scope=bb:sess56;scope=bb:sess57;scope=bb:sess58;scope=bb:sess59;scope=bb:sess6;scope=bb:sess60;scope=bb:sess61;scope=bb:sess62;scope=bb:sess63;scope=bb:sess64;scope=bb:sess65;scope=bb:sess66;scope=bb:sess67;scope=bb:sess68;scope=bb:sess69;scope=bb:sess7;scope=bb:sess70;scope=bb:sess71;scope=bb:sess72;scope=bb:sess73;scope=bb:sess74;scope=bb:sess75;scope=bb:sess76;scope=bb:sess77;scope=bb:sess78;scope=bb:sess79;scope=bb:sess8;scope=bb:sess80;scope=bb:sess81;scope=bb:sess82;scope=bb:sess83;scope=bb:sess84;scope=bb:sess85;scope=bb:sess86;scope=bb:sess87;scope=bb:sess88;scope=bb:sess89;scope=bb:sess9;scope=bb:sess90;scope=bb:sess91;scope=bb:sess92;scope=bb:sess93;scope=bb:sess94;scope=bb:sess95;scope=bb:sess96;scope=bb:sess97;scope=bb:sess98;scope=bb:sess99;", checkedTicket->DebugInfo());
+        UNIT_ASSERT(!checkedTicket->GetIssuerUid());
+    }
+
+    Y_UNIT_TEST(Ticket3Test) {
+        TServiceContext::TImpl context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_SERVICE_TICKET_3);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=serv;expiration_time=9223372036854775807;src=229;dst=28;", checkedTicket->DebugInfo());
+        UNIT_ASSERT(!checkedTicket->GetIssuerUid());
+    }
+
+    Y_UNIT_TEST(TicketIssuerTest) {
+        TServiceContext::TImpl context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_SERVICE_TICKET_ISSUER);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=serv;expiration_time=9223372036854775807;src=229;dst=28;issuer_uid=789654123;",
+                                 checkedTicket->DebugInfo());
+        UNIT_ASSERT(checkedTicket->GetIssuerUid());
+        UNIT_ASSERT_VALUES_EQUAL(789654123, *checkedTicket->GetIssuerUid());
+    }
+
+    Y_UNIT_TEST(TicketErrorsTest) {
+        TServiceContext::TImpl context(SECRET, NOT_OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket1 = context.Check(VALID_SERVICE_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::InvalidDst, checkedTicket1->GetStatus());
+
+        auto checkedTicket2 = context.Check(UNSUPPORTED_VERSION_SERVICE_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::UnsupportedVersion, checkedTicket2->GetStatus());
+
+        auto checkedTicket3 = context.Check(EXPIRED_SERVICE_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Expired, checkedTicket3->GetStatus());
+    }
+
+    Y_UNIT_TEST(TicketExceptionTest) {
+        TServiceContext::TImpl context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+
+        auto checkedTicket = context.Check(EXPIRED_SERVICE_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Expired, checkedTicket->GetStatus());
+
+        UNIT_ASSERT_EXCEPTION(checkedTicket->GetScopes(), TNotAllowedException);
+        UNIT_ASSERT_EXCEPTION(checkedTicket->GetSrc(), TNotAllowedException);
+        UNIT_ASSERT_EXCEPTION(checkedTicket->HasScope(""), TNotAllowedException);
+        UNIT_ASSERT_NO_EXCEPTION(bool(*checkedTicket));
+        UNIT_ASSERT_NO_EXCEPTION(checkedTicket->DebugInfo());
+    }
+
+    Y_UNIT_TEST(TicketProtoTest) {
+        ticket2::Ticket protobufTicket;
+        UNIT_ASSERT(protobufTicket.ParseFromString(NUtils::Base64url2bin(SERVICE_TICKET_PROTOBUF)));
+        TTestServiceTicketImpl checkedTicket(ETicketStatus::Ok, std::move(protobufTicket));
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket.GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL(std::numeric_limits<time_t>::max(), checkedTicket.GetExpirationTime());
+        UNIT_ASSERT_EQUAL(SRC_ID, checkedTicket.GetSrc());
+    }
+
+    Y_UNIT_TEST(ResetKeysTest) {
+        TServiceContext::TImpl context(SECRET, OUR_ID, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        context.ResetKeys(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_SERVICE_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket->GetStatus());
+    }
+
+    Y_UNIT_TEST(CreateTicketForTests) {
+        TCheckedServiceTicket t = NTvmAuth::NUnittest::CreateServiceTicket(ETicketStatus::Ok, 42);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, t.GetStatus());
+        UNIT_ASSERT_EQUAL(42, t.GetSrc());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=serv;src=42;dst=100500;", t.DebugInfo());
+    }
+
+    Y_UNIT_TEST(CreateForTests) {
+        auto t = TCheckedServiceTicket::TImpl::CreateTicketForTests(ETicketStatus::Ok, 456, {});
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, t->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL(456, t->GetSrc());
+        UNIT_ASSERT(!t->GetIssuerUid());
+
+        t = TCheckedServiceTicket::TImpl::CreateTicketForTests(ETicketStatus::Ok, 456, 100800);
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, t->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL(456, t->GetSrc());
+        UNIT_ASSERT(t->GetIssuerUid());
+        UNIT_ASSERT_VALUES_EQUAL(*t->GetIssuerUid(), 100800);
+
+        t = TCheckedServiceTicket::TImpl::CreateTicketForTests(ETicketStatus::Expired, 456, {});
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Expired, t->GetStatus());
+        UNIT_ASSERT_EXCEPTION_CONTAINS(t->GetSrc(), TNotAllowedException, "Method cannot be used in non-valid ticket");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(t->GetIssuerUid(), TNotAllowedException, "Method cannot be used in non-valid ticket");
+    }
+}
diff --git a/library/cpp/tvmauth/src/ut/user_ut.cpp b/library/cpp/tvmauth/src/ut/user_ut.cpp
new file mode 100644
index 0000000000..c040e94974
--- /dev/null
+++ b/library/cpp/tvmauth/src/ut/user_ut.cpp
@@ -0,0 +1,216 @@
+#include <library/cpp/tvmauth/src/user_impl.h>
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <library/cpp/tvmauth/exception.h>
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(UserTestSuite) {
+    Y_UNIT_TEST_DECLARE(TicketProtoTest);
+}
+
+class TTestUserTicketImpl: TCheckedUserTicket::TImpl {
+    using TCheckedUserTicket::TImpl::TImpl;
+    Y_UNIT_TEST_FRIEND(UserTestSuite, TicketProtoTest);
+};
+
+Y_UNIT_TEST_SUITE_IMPLEMENTATION(UserTestSuite) {
+    static const TString EMPTY_TVM_KEYS = "1:EpUBCpIBCAYQABqHATCBhAKBgQCoZkFGm9oLTqjeXZAq6j5S6i7K20V0lNdBBLqfmFBIRuTkYxhs4vUYnWjZrKRAd5bp6_py0csmFmpl_5Yh0b-2pdo_E5PNP7LGRzKyKSiFddyykKKzVOazH8YYldDAfE8Z5HoS9e48an5JsPg0jr-TPu34DnJq3yv2a6dqiKL9zSCakQY";
+    static const TString EXPIRED_USER_TICKET = "3:user:CA0QABokCgMIyAMKAgh7EMgDGghiYjpzZXNzMRoIYmI6c2VzczIgEigB:D0CmYVwWg91LDYejjeQ2UP8AeiA_mr1q1CUD_lfJ9zQSEYEOYGDTafg4Um2rwOOvQnsD1JHM4zHyMUJ6Jtp9GAm5pmhbXBBZqaCcJpyxLTEC8a81MhJFCCJRvu_G1FiAgRgB25gI3HIbkvHFUEqAIC_nANy7NFQnbKk2S-EQPGY";
+    static const TString MALFORMED_TVM_KEYS = "1:CpgCCpMCCAEQABqIAjCCAQQCggEAcLEXeH67FQESFUn4_7wnX7wN0PUrBoUsm3QQ4W5vC-qz6sXaEjSwnTV8w1o-z6X9KPLlhzMQvuS38NCNfK4uvJ4Zvfp3YsXJ25-rYtbnrYJHNvHohD-kPCCw_yZpMp21JdWigzQGuV7CtrxUhF-NNrsnUaJrE5-OpEWNt4X6nCItKIYeVcSK6XJUbEWbrNCRbvkSc4ak2ymFeMuHYJVjxh4eQbk7_ZPzodP0WvF6eUYrYeb42imVEOR8ofVLQWE5DVnb1z_TqZm4i1XkS7jMwZuBxBRw8DGdYei0lT_sAf7KST2jC0590NySB3vsBgWEVs1OdUUWA6r-Dvx9dsOQtSCVkQYQAAqZAgqUAggCEAAaiQIwggEFAoIBAQDhEBM5-6YsPWfogKtbluJoCX1WV2KdzOaQ0-OlRbBzeCzw-eQKu12c8WakHBbeCMd1I1TU64SDkDorWjXGIa_2xT6N3zzNAE50roTbPCcmeQrps26woTYfYIuqDdoxYKZNr0lvNLLW47vBr7EKqo1S4KSj7aXK_XYeEvUgIgf3nVIcNrio7VTnFmGGVQCepaL1Hi1gN4yIXjVZ06PBPZ-DxSRu6xOGbFrfKMJeMPs7KOyE-26Q3xOXdTIa1X-zYIucTd_bxUCL4BVbwW2AvbbFsaG7ISmVdGu0XUTmhXs1KrEfUVLRJhE4Dx99hAZXm1_HlYMUeJcMQ_oHOhV94ENFIJaRBhACCpYBCpEBCAMQABqGATCBgwKBgF9t2YJGAJkRRFq6fWhi3m1TFW1UOE0f6ZrfYhHAkpqGlKlh0QVfeTNPpeJhi75xXzCe6oReRUm-0DbqDNhTShC7uGUv1INYnRBQWH6E-5Fc5XrbDFSuGQw2EYjNfHy_HefHJXxQKAqPvxBDKMKkHgV58WtM6rC8jRi9sdX_ig2NIJeRBhABCpYBCpEBCAQQABqGATCBgwKBgGB4d6eLGUBv-Q6EPLehC4S-yuE2HB-_rJ7WkeYwyp-xIPolPrd-PQme2utHB4ZgpXHIu_OFksDe_0bPgZniNRSVRbl7W49DgS5Ya3kMfrYB4DnF5Fta5tn1oV6EwxYD4JONpFTenOJALPGTPawxXEfon_peiHOSBuQMu3_Vn-l1IJiRBhADCpcBCpIBCAUQABqHATCBhAKBgQCTJMKIfmfeZpaI7Q9rnsc29gdWawK7TnpVKRHws1iY7EUlYROeVcMdAwEqVM6f8BVCKLGgzQ7Gar_uuxfUGKwqEQzoppDraw4F75J464-7D5f6_oJQuGIBHZxqbMONtLjBCXRUhQW5szBLmTQ_R3qaJb5vf-h0APZfkYhq1cTttSCZkQYQBAqWAQqRAQgLEAAahgEwgYMCgYBvvGVH_M2H8qxxv94yaDYUTWbRnJ1uiIYc59KIQlfFimMPhSS7x2tqUa2-hI55JiII0Xym6GNkwLhyc1xtWChpVuIdSnbvttbrt4weDMLHqTwNOF6qAsVKGKT1Yh8yf-qb-DSmicgvFc74mBQm_6gAY1iQsf33YX8578ClhKBWHSCVkQYQAAqXAQqSAQgMEAAahwEwgYQCgYEAkuzFcd5TJu7lYWYe2hQLFfUWIIj91BvQQLa_Thln4YtGCO8gG1KJqJm-YlmJOWQG0B7H_5RVhxUxV9KpmFnsDVkzUFKOsCBaYGXc12xPVioawUlAwp5qp3QQtZyx_se97YIoLzuLr46UkLcLnkIrp-Jo46QzYi_QHq45WTm8MQ0glpEGEAIKlwEKkgEIDRAAGocBMIGEAoGBAIUzbxOknXf_rNt17_ir8JlWvrtnCWsQd1MAnl5mgArvavDtKeBYHzi5_Ak7DHlLzuA6YE8W175FxLFKpN2hkz-l-M7ltUSd8N1BvJRhK4t6WffWfC_1wPyoAbeSN2Yb1jygtZJQ8wGoXHcJQUXiMit3eFNyylwsJFj1gzAR4JCdIJeRBhABCpYBCpEBCA4QABqGATCBgwKBgFMcbEpl9ukVR6AO_R6sMyiU11I8b8MBSUCEC15iKsrVO8v_m47_TRRjWPYtQ9eZ7o1ocNJHaGUU7qqInFqtFaVnIceP6NmCsXhjs3MLrWPS8IRAy4Zf4FKmGOx3N9O2vemjUygZ9vUiSkULdVrecinRaT8JQ5RG4bUMY04XGIwFIJiRBhADCpYBCpEBCA8QABqGATCBgwKBgGpCkW-NR3li8GlRvqpq2YZGSIgm_PTyDI2Zwfw69grsBmPpVFW48Vw7xoMN35zcrojEpialB_uQzlpLYOvsMl634CRIuj-n1QE3-gaZTTTE8mg-AR4mcxnTKThPnRQpbuOlYAnriwiasWiQEMbGjq_HmWioYYxFo9USlklQn4-9IJmRBhAEEpUBCpIBCAYQABqHATCBhAKBgQCoZkFGm9oLTqjeXZAq6j5S6i7K20V0lNdBBLqfmFBIRuTkYxhs4vUYnWjZrKRAd5bp6_py0csmFmpl_5Yh0b-2pdo_E5PNP7LGRzKyKSiFddyykKKzVOazH8YYldDAfE8Z5HoS9e48an5JsPg0jr-TPu34DnJq3yv2a6dqiKL9zSCakQYSlQEKkgEIEBAAGocBMIGEAoGBALhrihbf3EpjDQS2sCQHazoFgN0nBbE9eesnnFTfzQELXb2gnJU9enmV_aDqaHKjgtLIPpCgn40lHrn5k6mvH5OdedyI6cCzE-N-GFp3nAq0NDJyMe0fhtIRD__CbT0ulcvkeow65ubXWfw6dBC2gR_34rdMe_L_TGRLMWjDULbNIJ";
+    static const TString UNSUPPORTED_VERSION_USER_TICKET = "2:user:CA0Q__________9_GiQKAwjIAwoCCHsQyAMaCGJiOnNlc3MxGghiYjpzZXNzMiASKAE:KJFv5EcXn9krYk19LCvlFrhMW-R4q8mKfXJXCd-RBVBgUQzCOR1Dx2FiOyU-BxUoIsaU0PiwTjbVY5I2onJDilge70Cl5zEPI9pfab2qwklACq_ZBUvD1tzrfNUr88otBGAziHASJWgyVDkhyQ3p7YbN38qpb0vGQrYNxlk4e2I";
+    static const TString USER_TICKET_PROTOBUF = "CA0Q__________9_GiQKAwjIAwoCCHsQyAMaCGJiOnNlc3MxGghiYjpzZXNzMiASKAE";
+    static const TString VALID_USER_TICKET_1 = "3:user:CA0Q__________9_GiQKAwjIAwoCCHsQyAMaCGJiOnNlc3MxGghiYjpzZXNzMiASKAE:KJFv5EcXn9krYk19LCvlFrhMW-R4q8mKfXJXCd-RBVBgUQzCOR1Dx2FiOyU-BxUoIsaU0PiwTjbVY5I2onJDilge70Cl5zEPI9pfab2qwklACq_ZBUvD1tzrfNUr88otBGAziHASJWgyVDkhyQ3p7YbN38qpb0vGQrYNxlk4e2I";
+    static const TString VALID_USER_TICKET_2 = "3:user:CA0Q__________9_GhAKAwjIAwoCCHsQyAMgEigB:KRibGYTJUA2ns0Fn7VYqeMZ1-GdscB1o9pRzELyr7QJrJsfsE8Y_HoVvB8Npr-oalv6AXOpagSc8HpZjAQz8zKMAVE_tI0tL-9DEsHirpawEbpy7OWV7-k18o1m-RaDaKeTlIB45KHbBul1-9aeKkortBfbbXtz_Qy9r_mfFPiQ";
+    static const TString VALID_USER_TICKET_3 = "3:user:CA0Q__________9_Go8bCgIIAAoCCAEKAggCCgIIAwoCCAQKAggFCgIIBgoCCAcKAggICgIICQoCCAoKAggLCgIIDAoCCA0KAggOCgIIDwoCCBAKAggRCgIIEgoCCBMKAggUCgIIFQoCCBYKAggXCgIIGAoCCBkKAggaCgIIGwoCCBwKAggdCgIIHgoCCB8KAgggCgIIIQoCCCIKAggjCgIIJAoCCCUKAggmCgIIJwoCCCgKAggpCgIIKgoCCCsKAggsCgIILQoCCC4KAggvCgIIMAoCCDEKAggyCgIIMwoCCDQKAgg1CgIINgoCCDcKAgg4CgIIOQoCCDoKAgg7CgIIPAoCCD0KAgg-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_AQoDCMABCgMIwQEKAwjCAQoDCMMBCgMIxAEKAwjFAQoDCMYBCgMIxwEKAwjIAQoDCMkBCgMIygEKAwjLAQoDCMwBCgMIzQEKAwjOAQoDCM8BCgMI0AEKAwjRAQoDCNIBCgMI0wEKAwjUAQoDCNUBCgMI1gEKAwjXAQoDCNgBCgMI2QEKAwjaAQoDCNsBCgMI3AEKAwjdAQoDCN4BCgMI3wEKAwjgAQoDCOEBCgMI4gEKAwjjAQoDCOQBCgMI5QEKAwjmAQoDCOcBCgMI6AEKAwjpAQoDCOoBCgMI6wEKAwjsAQoDCO0BCgMI7gEKAwjvAQoDCPABCgMI8QEKAwjyAQoDCPMBCgMI9AEKAwj1AQoDCPYBCgMI9wEKAwj4AQoDCPkBCgMI-gEKAwj7AQoDCPwBCgMI_QEKAwj-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-AIKAwj5AgoDCPoCCgMI-wIKAwj8AgoDCP0CCgMI_gIKAwj_AgoDCIADCgMIgQMKAwiCAwoDCIMDCgMIhAMKAwiFAwoDCIYDCgMIhwMKAwiIAwoDCIkDCgMIigMKAwiLAwoDCIwDCgMIjQMKAwiOAwoDCI8DCgMIkAMKAwiRAwoDCJIDCgMIkwMKAwiUAwoDCJUDCgMIlgMKAwiXAwoDCJgDCgMImQMKAwiaAwoDCJsDCgMInAMKAwidAwoDCJ4DCgMInwMKAwigAwoDCKEDCgMIogMKAwijAwoDCKQDCgMIpQMKAwimAwoDCKcDCgMIqAMKAwipAwoDCKoDCgMIqwMKAwisAwoDCK0DCgMIrgMKAwivAwoDCLADCgMIsQMKAwiyAwoDCLMDCgMItAMKAwi1AwoDCLYDCgMItwMKAwi4AwoDCLkDCgMIugMKAwi7AwoDCLwDCgMIvQMKAwi-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:CX8PIOrxJnQqFXl7wAsiHJ_1VGjoI-asNlCXb8SE8jtI2vdh9x6CqbAurSgIlAAEgotVP-nuUR38x_a9YJuXzmG5AvJ458apWQtODHIDIX6ZaIwMxjS02R7S5LNqXa0gAuU_R6bCWpZdWe2uLMkdpu5KHbDgW08g-uaP_nceDOk";
+
+    Y_UNIT_TEST(ContextText) {
+        TUserContext::TImpl context(EBlackboxEnv::Prod, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT_EQUAL(2, context.GetKeys().size());
+        UNIT_ASSERT_NO_EXCEPTION(context.ResetKeys(NUnittest::TVMKNIFE_PUBLIC_KEYS));
+        UNIT_ASSERT_EQUAL(2, context.GetKeys().size());
+    }
+
+    Y_UNIT_TEST(ContextEnvTest) {
+        TUserContext::TImpl p(EBlackboxEnv::Prod, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT_EQUAL(2, p.GetKeys().size());
+        UNIT_ASSERT(p.IsAllowed(tvm_keys::Prod));
+        UNIT_ASSERT(!p.IsAllowed(tvm_keys::ProdYateam));
+        UNIT_ASSERT(!p.IsAllowed(tvm_keys::Test));
+        UNIT_ASSERT(!p.IsAllowed(tvm_keys::TestYateam));
+        UNIT_ASSERT(!p.IsAllowed(tvm_keys::Stress));
+
+        TUserContext::TImpl pt(EBlackboxEnv::ProdYateam, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT_EQUAL(2, pt.GetKeys().size());
+        UNIT_ASSERT(!pt.IsAllowed(tvm_keys::Prod));
+        UNIT_ASSERT(pt.IsAllowed(tvm_keys::ProdYateam));
+        UNIT_ASSERT(!pt.IsAllowed(tvm_keys::Test));
+        UNIT_ASSERT(!pt.IsAllowed(tvm_keys::TestYateam));
+        UNIT_ASSERT(!pt.IsAllowed(tvm_keys::Stress));
+
+        TUserContext::TImpl t(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT_EQUAL(2, t.GetKeys().size());
+        UNIT_ASSERT(!t.IsAllowed(tvm_keys::Prod));
+        UNIT_ASSERT(!t.IsAllowed(tvm_keys::ProdYateam));
+        UNIT_ASSERT(t.IsAllowed(tvm_keys::Test));
+        UNIT_ASSERT(!t.IsAllowed(tvm_keys::TestYateam));
+        UNIT_ASSERT(!t.IsAllowed(tvm_keys::Stress));
+
+        TUserContext::TImpl tt(EBlackboxEnv::TestYateam, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT_EQUAL(2, tt.GetKeys().size());
+        UNIT_ASSERT(!tt.IsAllowed(tvm_keys::Prod));
+        UNIT_ASSERT(!tt.IsAllowed(tvm_keys::ProdYateam));
+        UNIT_ASSERT(!tt.IsAllowed(tvm_keys::Test));
+        UNIT_ASSERT(tt.IsAllowed(tvm_keys::TestYateam));
+        UNIT_ASSERT(!tt.IsAllowed(tvm_keys::Stress));
+
+        TUserContext::TImpl s(EBlackboxEnv::Stress, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT_EQUAL(4, s.GetKeys().size());
+        UNIT_ASSERT(s.IsAllowed(tvm_keys::Prod));
+        UNIT_ASSERT(!s.IsAllowed(tvm_keys::ProdYateam));
+        UNIT_ASSERT(!s.IsAllowed(tvm_keys::Test));
+        UNIT_ASSERT(!s.IsAllowed(tvm_keys::TestYateam));
+        UNIT_ASSERT(s.IsAllowed(tvm_keys::Stress));
+    }
+
+    Y_UNIT_TEST(ContextExceptionsText) {
+        UNIT_ASSERT_EXCEPTION(TUserContext::TImpl(EBlackboxEnv::Prod, EMPTY_TVM_KEYS), TEmptyTvmKeysException);
+        UNIT_ASSERT_EXCEPTION(TUserContext::TImpl(EBlackboxEnv::Prod, MALFORMED_TVM_KEYS), TMalformedTvmKeysException);
+        UNIT_ASSERT_EXCEPTION(TUserContext::TImpl(EBlackboxEnv::Prod, "adcvxcv./-+"), TMalformedTvmKeysException);
+    }
+
+    Y_UNIT_TEST(Ticket1Test) {
+        TUserContext::TImpl context(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_USER_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket->GetStatus());
+        UNIT_ASSERT_EQUAL(std::numeric_limits<time_t>::max(), checkedTicket->GetExpirationTime());
+        UNIT_ASSERT_EQUAL(TUids({456, 123}), checkedTicket->GetUids());
+        UNIT_ASSERT_EQUAL(456, checkedTicket->GetDefaultUid());
+        UNIT_ASSERT_EQUAL(TScopes({"bb:sess1", "bb:sess2"}), checkedTicket->GetScopes());
+        UNIT_ASSERT(checkedTicket->HasScope("bb:sess1"));
+        UNIT_ASSERT(checkedTicket->HasScope("bb:sess2"));
+        UNIT_ASSERT(!checkedTicket->HasScope("bb:sess3"));
+        UNIT_ASSERT_EQUAL("ticket_type=user;expiration_time=9223372036854775807;scope=bb:sess1;scope=bb:sess2;default_uid=456;uid=456;uid=123;env=Test;", checkedTicket->DebugInfo());
+    }
+
+    Y_UNIT_TEST(Ticket2Test) {
+        TUserContext::TImpl context(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_USER_TICKET_2);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=user;expiration_time=9223372036854775807;default_uid=456;uid=456;uid=123;env=Test;", checkedTicket->DebugInfo());
+    }
+
+    Y_UNIT_TEST(Ticket3Test) {
+        TUserContext::TImpl context(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_USER_TICKET_3);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=user;expiration_time=9223372036854775807;scope=bb:sess1;scope=bb:sess10;scope=bb:sess100;scope=bb:sess11;scope=bb:sess12;scope=bb:sess13;scope=bb:sess14;scope=bb:sess15;scope=bb:sess16;scope=bb:sess17;scope=bb:sess18;scope=bb:sess19;scope=bb:sess2;scope=bb:sess20;scope=bb:sess21;scope=bb:sess22;scope=bb:sess23;scope=bb:sess24;scope=bb:sess25;scope=bb:sess26;scope=bb:sess27;scope=bb:sess28;scope=bb:sess29;scope=bb:sess3;scope=bb:sess30;scope=bb:sess31;scope=bb:sess32;scope=bb:sess33;scope=bb:sess34;scope=bb:sess35;scope=bb:sess36;scope=bb:sess37;scope=bb:sess38;scope=bb:sess39;scope=bb:sess4;scope=bb:sess40;scope=bb:sess41;scope=bb:sess42;scope=bb:sess43;scope=bb:sess44;scope=bb:sess45;scope=bb:sess46;scope=bb:sess47;scope=bb:sess48;scope=bb:sess49;scope=bb:sess5;scope=bb:sess50;scope=bb:sess51;scope=bb:sess52;scope=bb:sess53;scope=bb:sess54;scope=bb:sess55;scope=bb:sess56;scope=bb:sess57;scope=bb:sess58;scope=bb:sess59;scope=bb:sess6;scope=bb:sess60;scope=bb:sess61;scope=bb:sess62;scope=bb:sess63;scope=bb:sess64;scope=bb:sess65;scope=bb:sess66;scope=bb:sess67;scope=bb:sess68;scope=bb:sess69;scope=bb:sess7;scope=bb:sess70;scope=bb:sess71;scope=bb:sess72;scope=bb:sess73;scope=bb:sess74;scope=bb:sess75;scope=bb:sess76;scope=bb:sess77;scope=bb:sess78;scope=bb:sess79;scope=bb:sess8;scope=bb:sess80;scope=bb:sess81;scope=bb:sess82;scope=bb:sess83;scope=bb:sess84;scope=bb:sess85;scope=bb:sess86;scope=bb:sess87;scope=bb:sess88;scope=bb:sess89;scope=bb:sess9;scope=bb:sess90;scope=bb:sess91;scope=bb:sess92;scope=bb:sess93;scope=bb:sess94;scope=bb:sess95;scope=bb:sess96;scope=bb:sess97;scope=bb:sess98;scope=bb:sess99;default_uid=456;uid=0;uid=1;uid=2;uid=3;uid=4;uid=5;uid=6;uid=7;uid=8;uid=9;uid=10;uid=11;uid=12;uid=13;uid=14;uid=15;uid=16;uid=17;uid=18;uid=19;uid=20;uid=21;uid=22;uid=23;uid=24;uid=25;uid=26;uid=27;uid=28;uid=29;uid=30;uid=31;uid=32;uid=33;uid=34;uid=35;uid=36;uid=37;uid=38;uid=39;uid=40;uid=41;uid=42;uid=43;uid=44;uid=45;uid=46;uid=47;uid=48;uid=49;uid=50;uid=51;uid=52;uid=53;uid=54;uid=55;uid=56;uid=57;uid=58;uid=59;uid=60;uid=61;uid=62;uid=63;uid=64;uid=65;uid=66;uid=67;uid=68;uid=69;uid=70;uid=71;uid=72;uid=73;uid=74;uid=75;uid=76;uid=77;uid=78;uid=79;uid=80;uid=81;uid=82;uid=83;uid=84;uid=85;uid=86;uid=87;uid=88;uid=89;uid=90;uid=91;uid=92;uid=93;uid=94;uid=95;uid=96;uid=97;uid=98;uid=99;uid=100;uid=101;uid=102;uid=103;uid=104;uid=105;uid=106;uid=107;uid=108;uid=109;uid=110;uid=111;uid=112;uid=113;uid=114;uid=115;uid=116;uid=117;uid=118;uid=119;uid=120;uid=121;uid=122;uid=123;uid=124;uid=125;uid=126;uid=127;uid=128;uid=129;uid=130;uid=131;uid=132;uid=133;uid=134;uid=135;uid=136;uid=137;uid=138;uid=139;uid=140;uid=141;uid=142;uid=143;uid=144;uid=145;uid=146;uid=147;uid=148;uid=149;uid=150;uid=151;uid=152;uid=153;uid=154;uid=155;uid=156;uid=157;uid=158;uid=159;uid=160;uid=161;uid=162;uid=163;uid=164;uid=165;uid=166;uid=167;uid=168;uid=169;uid=170;uid=171;uid=172;uid=173;uid=174;uid=175;uid=176;uid=177;uid=178;uid=179;uid=180;uid=181;uid=182;uid=183;uid=184;uid=185;uid=186;uid=187;uid=188;uid=189;uid=190;uid=191;uid=192;uid=193;uid=194;uid=195;uid=196;uid=197;uid=198;uid=199;uid=200;uid=201;uid=202;uid=203;uid=204;uid=205;uid=206;uid=207;uid=208;uid=209;uid=210;uid=211;uid=212;uid=213;uid=214;uid=215;uid=216;uid=217;uid=218;uid=219;uid=220;uid=221;uid=222;uid=223;uid=224;uid=225;uid=226;uid=227;uid=228;uid=229;uid=230;uid=231;uid=232;uid=233;uid=234;uid=235;uid=236;uid=237;uid=238;uid=239;uid=240;uid=241;uid=242;uid=243;uid=244;uid=245;uid=246;uid=247;uid=248;uid=249;uid=250;uid=251;uid=252;uid=253;uid=254;uid=255;uid=256;uid=257;uid=258;uid=259;uid=260;uid=261;uid=262;uid=263;uid=264;uid=265;uid=266;uid=267;uid=268;uid=269;uid=270;uid=271;uid=272;uid=273;uid=274;uid=275;uid=276;uid=277;uid=278;uid=279;uid=280;uid=281;uid=282;uid=283;uid=284;uid=285;uid=286;uid=287;uid=288;uid=289;uid=290;uid=291;uid=292;uid=293;uid=294;uid=295;uid=296;uid=297;uid=298;uid=299;uid=300;uid=301;uid=302;uid=303;uid=304;uid=305;uid=306;uid=307;uid=308;uid=309;uid=310;uid=311;uid=312;uid=313;uid=314;uid=315;uid=316;uid=317;uid=318;uid=319;uid=320;uid=321;uid=322;uid=323;uid=324;uid=325;uid=326;uid=327;uid=328;uid=329;uid=330;uid=331;uid=332;uid=333;uid=334;uid=335;uid=336;uid=337;uid=338;uid=339;uid=340;uid=341;uid=342;uid=343;uid=344;uid=345;uid=346;uid=347;uid=348;uid=349;uid=350;uid=351;uid=352;uid=353;uid=354;uid=355;uid=356;uid=357;uid=358;uid=359;uid=360;uid=361;uid=362;uid=363;uid=364;uid=365;uid=366;uid=367;uid=368;uid=369;uid=370;uid=371;uid=372;uid=373;uid=374;uid=375;uid=376;uid=377;uid=378;uid=379;uid=380;uid=381;uid=382;uid=383;uid=384;uid=385;uid=386;uid=387;uid=388;uid=389;uid=390;uid=391;uid=392;uid=393;uid=394;uid=395;uid=396;uid=397;uid=398;uid=399;uid=400;uid=401;uid=402;uid=403;uid=404;uid=405;uid=406;uid=407;uid=408;uid=409;uid=410;uid=411;uid=412;uid=413;uid=414;uid=415;uid=416;uid=417;uid=418;uid=419;uid=420;uid=421;uid=422;uid=423;uid=424;uid=425;uid=426;uid=427;uid=428;uid=429;uid=430;uid=431;uid=432;uid=433;uid=434;uid=435;uid=436;uid=437;uid=438;uid=439;uid=440;uid=441;uid=442;uid=443;uid=444;uid=445;uid=446;uid=447;uid=448;uid=449;uid=450;uid=451;uid=452;uid=453;uid=454;uid=455;uid=456;uid=457;uid=458;uid=459;uid=460;uid=461;uid=462;uid=463;uid=464;uid=465;uid=466;uid=467;uid=468;uid=469;uid=470;uid=471;uid=472;uid=473;uid=474;uid=475;uid=476;uid=477;uid=478;uid=479;uid=480;uid=481;uid=482;uid=483;uid=484;uid=485;uid=486;uid=487;uid=488;uid=489;uid=490;uid=491;uid=492;uid=493;uid=494;uid=495;uid=496;uid=497;uid=498;uid=499;env=Test;", checkedTicket->DebugInfo());
+    }
+
+    Y_UNIT_TEST(TicketExceptionsTest) {
+        TUserContext::TImpl contextTest(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket1 = contextTest.Check(UNSUPPORTED_VERSION_USER_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::UnsupportedVersion, checkedTicket1->GetStatus());
+
+        auto checkedTicket2 = contextTest.Check(EXPIRED_USER_TICKET);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Expired, checkedTicket2->GetStatus());
+
+        TUserContext::TImpl contextProd(EBlackboxEnv::Prod, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket3 = contextProd.Check(VALID_USER_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::InvalidBlackboxEnv, checkedTicket3->GetStatus());
+
+        UNIT_ASSERT_EXCEPTION(checkedTicket3->GetDefaultUid(), TNotAllowedException);
+        UNIT_ASSERT_EXCEPTION(checkedTicket3->GetUids(), TNotAllowedException);
+        UNIT_ASSERT_EXCEPTION(checkedTicket3->GetScopes(), TNotAllowedException);
+        UNIT_ASSERT_EXCEPTION(checkedTicket3->HasScope(""), TNotAllowedException);
+        UNIT_ASSERT_NO_EXCEPTION(bool(*checkedTicket3));
+        UNIT_ASSERT_NO_EXCEPTION(checkedTicket3->DebugInfo());
+        UNIT_ASSERT_NO_EXCEPTION(checkedTicket3->GetStatus());
+    }
+
+    Y_UNIT_TEST(TicketProtoTest) {
+        ticket2::Ticket protobufTicket;
+        UNIT_ASSERT(protobufTicket.ParseFromString(NUtils::Base64url2bin(USER_TICKET_PROTOBUF)));
+        TTestUserTicketImpl userTicket(ETicketStatus::Ok, std::move(protobufTicket));
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, userTicket.GetStatus());
+        UNIT_ASSERT_EQUAL(std::numeric_limits<time_t>::max(), userTicket.GetExpirationTime());
+        UNIT_ASSERT_EQUAL(TUids({456, 123}), userTicket.GetUids());
+        UNIT_ASSERT_EQUAL(456, userTicket.GetDefaultUid());
+        UNIT_ASSERT_EQUAL(TScopes({"bb:sess1", "bb:sess2"}), userTicket.GetScopes());
+        UNIT_ASSERT(userTicket.HasScope("bb:sess1"));
+        UNIT_ASSERT(userTicket.HasScope("bb:sess2"));
+        UNIT_ASSERT(!userTicket.HasScope("bb:sess3"));
+    }
+
+    Y_UNIT_TEST(ResetKeysTest) {
+        TUserContext::TImpl context(EBlackboxEnv::Test, NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        context.ResetKeys(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        auto checkedTicket = context.Check(VALID_USER_TICKET_1);
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, checkedTicket->GetStatus());
+    }
+
+    Y_UNIT_TEST(CreateTicketForTests) {
+        TCheckedUserTicket t = NTvmAuth::NUnittest::CreateUserTicket(ETicketStatus::Ok, 42, {"qwerty", "omg"}, {43, 55, 47});
+        UNIT_ASSERT_EQUAL(ETicketStatus::Ok, t.GetStatus());
+        UNIT_ASSERT_EQUAL(42, t.GetDefaultUid());
+        UNIT_ASSERT_EQUAL(TUids({42, 43, 47, 55}), t.GetUids());
+        UNIT_ASSERT_EQUAL(TScopes({"omg", "qwerty"}), t.GetScopes());
+        UNIT_ASSERT_VALUES_EQUAL("ticket_type=user;scope=omg;scope=qwerty;default_uid=42;uid=42;uid=43;uid=47;uid=55;env=Test;", t.DebugInfo());
+    }
+
+    Y_UNIT_TEST(CreateForTests) {
+        TUids uids{456};
+        TScopes scopes{"scope1", "scope2", "scope3"};
+        TScopes scopesIn{"scope1", "scope2", "scope3", "scope1", ""};
+        auto t = TCheckedUserTicket::TImpl::CreateTicketForTests(ETicketStatus::Ok, 456, scopesIn, {});
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, t->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL(456, t->GetDefaultUid());
+        UNIT_ASSERT_VALUES_EQUAL(uids, t->GetUids());
+        UNIT_ASSERT_VALUES_EQUAL(scopes, t->GetScopes());
+
+        t = TCheckedUserTicket::TImpl::CreateTicketForTests(ETicketStatus::Ok, 456, scopesIn, {123, 456, 789});
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, t->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL(456, t->GetDefaultUid());
+        uids = TUids{123, 456, 789};
+        UNIT_ASSERT_VALUES_EQUAL(uids, t->GetUids());
+        UNIT_ASSERT_VALUES_EQUAL(scopes, t->GetScopes());
+
+        t = TCheckedUserTicket::TImpl::CreateTicketForTests(ETicketStatus::Ok, 456, scopesIn, {123, 789});
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, t->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL(456, t->GetDefaultUid());
+        uids = TUids{123, 456, 789};
+        UNIT_ASSERT_VALUES_EQUAL(uids, t->GetUids());
+        UNIT_ASSERT_VALUES_EQUAL(scopes, t->GetScopes());
+
+        t = TCheckedUserTicket::TImpl::CreateTicketForTests(ETicketStatus::Ok, 0, scopesIn, {123, 789});
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, t->GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL(0, t->GetDefaultUid());
+        uids = TUids{123, 789};
+        UNIT_ASSERT_VALUES_EQUAL(uids, t->GetUids());
+        UNIT_ASSERT_VALUES_EQUAL(scopes, t->GetScopes());
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TCheckedUserTicket::TImpl::CreateTicketForTests(ETicketStatus::Ok, 0, scopesIn, {}),
+                                       yexception,
+                                       "User ticket cannot contain empty uid list");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TCheckedUserTicket::TImpl::CreateTicketForTests(ETicketStatus::Ok, 0, scopesIn, {0}),
+                                       yexception,
+                                       "User ticket cannot contain empty uid list");
+    }
+}
+
+template <>
+void Out<NTvmAuth::TUids>(IOutputStream& o, const NTvmAuth::TUids& v) {
+    for (const auto& uid : v) {
+        o << uid << ",";
+    }
+}
+
+template <>
+void Out<NTvmAuth::TScopes>(IOutputStream& o, const NTvmAuth::TScopes& v) {
+    for (const auto& scope : v) {
+        o << scope << ",";
+    }
+}
diff --git a/library/cpp/tvmauth/src/ut/utils_ut.cpp b/library/cpp/tvmauth/src/ut/utils_ut.cpp
new file mode 100644
index 0000000000..c9cb81c36f
--- /dev/null
+++ b/library/cpp/tvmauth/src/ut/utils_ut.cpp
@@ -0,0 +1,95 @@
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/generic/maybe.h>
+
+Y_UNIT_TEST_SUITE(UtilsTestSuite) {
+    static const TString VALID_SERVICE_TICKET_1 = "3:serv:CBAQ__________9_IhkI5QEQHBoIYmI6c2VzczEaCGJiOnNlc3My:WUPx1cTf05fjD1exB35T5j2DCHWH1YaLJon_a4rN-D7JfXHK1Ai4wM4uSfboHD9xmGQH7extqtlEk1tCTCGm5qbRVloJwWzCZBXo3zKX6i1oBYP_89WcjCNPVe1e8jwGdLsnu6PpxL5cn0xCksiStILH5UmDR6xfkJdnmMG94o8";
+    static const TString EXPIRED_SERVICE_TICKET = "3:serv:CBAQACIZCOUBEBwaCGJiOnNlc3MxGghiYjpzZXNzMg:IwfMNJYEqStY_SixwqJnyHOMCPR7-3HHk4uylB2oVRkthtezq-OOA7QizDvx7VABLs_iTlXuD1r5IjufNei_EiV145eaa3HIg4xCdJXCojMexf2UYJz8mF2b0YzFAy6_KWagU7xo13CyKAqzJuQf5MJcSUf0ecY9hVh36cJ51aw";
+    using namespace NTvmAuth;
+
+    Y_UNIT_TEST(base64Test) {
+        UNIT_ASSERT_VALUES_EQUAL("-hHx", NUtils::Bin2base64url("\xfa\x11\xf1"));
+        UNIT_ASSERT_VALUES_EQUAL("-hHx_g", NUtils::Bin2base64url("\xfa\x11\xf1\xfe"));
+        UNIT_ASSERT_VALUES_EQUAL("-hHx_v8", NUtils::Bin2base64url("\xfa\x11\xf1\xfe\xff"));
+
+        UNIT_ASSERT_VALUES_EQUAL("", NUtils::Base64url2bin("hHx++"));
+        UNIT_ASSERT_VALUES_EQUAL("", NUtils::Base64url2bin("&*^"));
+        UNIT_ASSERT_VALUES_EQUAL("", NUtils::Base64url2bin(""));
+        UNIT_ASSERT_VALUES_EQUAL("", NUtils::Bin2base64url(""));
+
+        UNIT_ASSERT_VALUES_EQUAL("\xfa\x11\xf1", NUtils::Base64url2bin("-hHx"));
+        UNIT_ASSERT_VALUES_EQUAL("\xfa\x11\xf1\xfe", NUtils::Base64url2bin("-hHx_g"));
+        UNIT_ASSERT_VALUES_EQUAL("\xfa\x11\xf1\xfe", NUtils::Base64url2bin("-hHx_g="));
+        UNIT_ASSERT_VALUES_EQUAL("\xfa\x11\xf1\xfe", NUtils::Base64url2bin("-hHx_g=="));
+        UNIT_ASSERT_VALUES_EQUAL("\xfa\x11\xf1\xfe\xff", NUtils::Base64url2bin("-hHx_v8"));
+        UNIT_ASSERT_VALUES_EQUAL("\xfa\x11\xf1\xfe\xff", NUtils::Base64url2bin("-hHx_v8="));
+
+        UNIT_ASSERT_VALUES_EQUAL("SGVsbG8sIGV2ZXJ5Ym9keSE",
+                                 NUtils::Bin2base64url(("Hello, everybody!")));
+        UNIT_ASSERT_VALUES_EQUAL("Hello, everybody!",
+                                 NUtils::Base64url2bin(("SGVsbG8sIGV2ZXJ5Ym9keSE")));
+        UNIT_ASSERT_VALUES_EQUAL("VGhlIE1hZ2ljIFdvcmRzIGFyZSBTcXVlYW1pc2ggT3NzaWZyYWdl",
+                                 NUtils::Bin2base64url(("The Magic Words are Squeamish Ossifrage")));
+        UNIT_ASSERT_VALUES_EQUAL("The Magic Words are Squeamish Ossifrage",
+                                 NUtils::Base64url2bin(("VGhlIE1hZ2ljIFdvcmRzIGFyZSBTcXVlYW1pc2ggT3NzaWZyYWdl")));
+    }
+
+    Y_UNIT_TEST(sign) {
+        UNIT_ASSERT_VALUES_EQUAL("wkGfeuopf709ozPAeGcDMqtZXPzsWvuNJ1BL586dSug",
+                                 NUtils::SignCgiParamsForTvm(NUtils::Base64url2bin("GRMJrKnj4fOVnvOqe-WyD1"),
+                                                             "1490000000",
+                                                             "13,19",
+                                                             "bb:sess,bb:sess2"));
+
+        UNIT_ASSERT_VALUES_EQUAL("HANDYrA4ApQMQ5cfSWZk_InHWJffoXAa57P_X_B5s4M",
+                                 NUtils::SignCgiParamsForTvm(NUtils::Base64url2bin("GRMJrKnj4fOasvOqe-WyD1"),
+                                                             "1490000000",
+                                                             "13,19",
+                                                             "bb:sess,bb:sess2"));
+
+        UNIT_ASSERT_VALUES_EQUAL("T-M-3_qtjRM1dR_3hS1CRlHBTZRKK04doHXBJw-5VRk",
+                                 NUtils::SignCgiParamsForTvm(NUtils::Base64url2bin("GRMJrKnj4fOasvOqe-WyD1"),
+                                                             "1490000001",
+                                                             "13,19",
+                                                             "bb:sess,bb:sess2"));
+
+        UNIT_ASSERT_VALUES_EQUAL("gwB6M_9Jij50ZADmlDMnoyLc6AhQmtq6MClgGzO1PBE",
+                                 NUtils::SignCgiParamsForTvm(NUtils::Base64url2bin("GRMJrKnj4fOasvOqe-WyD1"),
+                                                             "1490000001",
+                                                             "13,19",
+                                                             ""));
+    }
+
+    Y_UNIT_TEST(GetExpirationTime) {
+        UNIT_ASSERT(!NTvmAuth::NInternal::TCanningKnife::GetExpirationTime("3:aadasdasdasdas"));
+
+        UNIT_ASSERT(NTvmAuth::NInternal::TCanningKnife::GetExpirationTime(VALID_SERVICE_TICKET_1));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(std::numeric_limits<time_t>::max()),
+                                 *NTvmAuth::NInternal::TCanningKnife::GetExpirationTime(VALID_SERVICE_TICKET_1));
+
+        UNIT_ASSERT(NTvmAuth::NInternal::TCanningKnife::GetExpirationTime(EXPIRED_SERVICE_TICKET));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(0),
+                                 *NTvmAuth::NInternal::TCanningKnife::GetExpirationTime(EXPIRED_SERVICE_TICKET));
+    }
+
+    Y_UNIT_TEST(RemoveSignatureTest) {
+        UNIT_ASSERT_VALUES_EQUAL("1:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds",
+                                 NUtils::RemoveTicketSignature("1:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("2:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds",
+                                 NUtils::RemoveTicketSignature("2:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("4:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds",
+                                 NUtils::RemoveTicketSignature("4:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("3.serv.ASDkljbjhsdbfLJHABFJHBslfbsfjs.asdxcvbxcvniueliuweklsvds",
+                                 NUtils::RemoveTicketSignature("3.serv.ASDkljbjhsdbfLJHABFJHBslfbsfjs.asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("3:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:",
+                                 NUtils::RemoveTicketSignature("3:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("3:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:",
+                                 NUtils::RemoveTicketSignature("3:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs:asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("3:serv:",
+                                 NUtils::RemoveTicketSignature("3:serv:ASDkljbjhsdbfLJHABFJHBslfbsfjs.asdxcvbxcvniueliuweklsvds"));
+        UNIT_ASSERT_VALUES_EQUAL("asdxcbvfgdsgfasdfxczvdsgfxcdvbcbvf",
+                                 NUtils::RemoveTicketSignature("asdxcbvfgdsgfasdfxczvdsgfxcdvbcbvf"));
+    }
+}
diff --git a/library/cpp/tvmauth/src/ut/version_ut.cpp b/library/cpp/tvmauth/src/ut/version_ut.cpp
new file mode 100644
index 0000000000..eeb95d1cde
--- /dev/null
+++ b/library/cpp/tvmauth/src/ut/version_ut.cpp
@@ -0,0 +1,18 @@
+#include <library/cpp/tvmauth/version.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <regex>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(VersionTest) {
+    Y_UNIT_TEST(base64Test) {
+        const std::regex re(R"(^\d+\.\d+\.\d+$)");
+
+        for (size_t idx = 0; idx < 2; ++idx) {
+            TStringBuf ver = LibVersion();
+            UNIT_ASSERT(std::regex_match(ver.begin(), ver.end(), re));
+        }
+    }
+}
diff --git a/library/cpp/tvmauth/src/utils.cpp b/library/cpp/tvmauth/src/utils.cpp
new file mode 100644
index 0000000000..f56fafd97b
--- /dev/null
+++ b/library/cpp/tvmauth/src/utils.cpp
@@ -0,0 +1,162 @@
+#include "utils.h"
+
+#include "parser.h"
+
+#include <openssl/evp.h>
+#include <openssl/hmac.h>
+#include <openssl/md5.h>
+#include <openssl/sha.h>
+
+#include <util/generic/maybe.h>
+#include <util/generic/strbuf.h>
+
+#include <array>
+
+namespace {
+    constexpr const unsigned char b64_encode[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+
+    constexpr std::array<unsigned char, 256> B64Init() {
+        std::array<unsigned char, 256> buf{};
+        for (auto& i : buf)
+            i = 0xff;
+
+        for (int i = 0; i < 64; ++i)
+            buf[b64_encode[i]] = i;
+
+        return buf;
+    }
+    constexpr std::array<unsigned char, 256> b64_decode = B64Init();
+}
+
+namespace NTvmAuth::NUtils {
+    TString Bin2base64url(TStringBuf buf) {
+        if (!buf) {
+            return TString();
+        }
+
+        TString res;
+        res.resize(((buf.size() + 2) / 3) << 2, 0);
+
+        const unsigned char* pB = (const unsigned char*)buf.data();
+        const unsigned char* pE = (const unsigned char*)buf.data() + buf.size();
+        unsigned char* p = (unsigned char*)res.data();
+        for (; pB + 2 < pE; pB += 3) {
+            const unsigned char a = *pB;
+            *p++ = b64_encode[(a >> 2) & 0x3F];
+            const unsigned char b = *(pB + 1);
+            *p++ = b64_encode[((a & 0x3) << 4) | ((b & 0xF0) >> 4)];
+            const unsigned char c = *(pB + 2);
+            *p++ = b64_encode[((b & 0xF) << 2) | ((c & 0xC0) >> 6)];
+            *p++ = b64_encode[c & 0x3F];
+        }
+
+        if (pB < pE) {
+            const unsigned char a = *pB;
+            *p++ = b64_encode[(a >> 2) & 0x3F];
+
+            if (pB == (pE - 1)) {
+                *p++ = b64_encode[((a & 0x3) << 4)];
+            } else {
+                const unsigned char b = *(pB + 1);
+                *p++ = b64_encode[((a & 0x3) << 4) |
+                                  ((int)(b & 0xF0) >> 4)];
+                *p++ = b64_encode[((b & 0xF) << 2)];
+            }
+        }
+
+        res.resize(p - (unsigned char*)res.data());
+        return res;
+    }
+
+    TString Base64url2bin(TStringBuf buf) {
+        const unsigned char* bufin = (const unsigned char*)buf.data();
+        if (!buf || b64_decode[*bufin] > 63) {
+            return TString();
+        }
+        const unsigned char* bufend = (const unsigned char*)buf.data() + buf.size();
+        while (++bufin < bufend && b64_decode[*bufin] < 64)
+            ;
+        int nprbytes = (bufin - (const unsigned char*)buf.data());
+        int nbytesdecoded = ((nprbytes + 3) / 4) * 3;
+
+        if (nprbytes < static_cast<int>(buf.size())) {
+            int left = buf.size() - nprbytes;
+            while (left--) {
+                if (*(bufin++) != '=')
+                    return TString();
+            }
+        }
+
+        TString res;
+        res.resize(nbytesdecoded);
+
+        unsigned char* bufout = (unsigned char*)res.data();
+        bufin = (const unsigned char*)buf.data();
+
+        while (nprbytes > 4) {
+            unsigned char a = b64_decode[*bufin];
+            unsigned char b = b64_decode[bufin[1]];
+            *(bufout++) = (unsigned char)(a << 2 | b >> 4);
+            unsigned char c = b64_decode[bufin[2]];
+            *(bufout++) = (unsigned char)(b << 4 | c >> 2);
+            unsigned char d = b64_decode[bufin[3]];
+            *(bufout++) = (unsigned char)(c << 6 | d);
+            bufin += 4;
+            nprbytes -= 4;
+        }
+
+        if (nprbytes == 1) {
+            return {}; // Impossible
+        }
+        if (nprbytes > 1) {
+            *(bufout++) = (unsigned char)(b64_decode[*bufin] << 2 | b64_decode[bufin[1]] >> 4);
+        }
+        if (nprbytes > 2) {
+            *(bufout++) = (unsigned char)(b64_decode[bufin[1]] << 4 | b64_decode[bufin[2]] >> 2);
+        }
+        if (nprbytes > 3) {
+            *(bufout++) = (unsigned char)(b64_decode[bufin[2]] << 6 | b64_decode[bufin[3]]);
+        }
+
+        int diff = (4 - nprbytes) & 3;
+        if (diff) {
+            nbytesdecoded -= (4 - nprbytes) & 3;
+            res.resize(nbytesdecoded);
+        }
+
+        return res;
+    }
+
+    TString SignCgiParamsForTvm(TStringBuf secret, TStringBuf ts, TStringBuf dstTvmId, TStringBuf scopes) {
+        TString data;
+        data.reserve(ts.size() + dstTvmId.size() + scopes.size() + 3);
+        const char DELIM = '|';
+        data.append(ts).push_back(DELIM);
+        data.append(dstTvmId).push_back(DELIM);
+        data.append(scopes).push_back(DELIM);
+
+        TString value(EVP_MAX_MD_SIZE, 0);
+        unsigned macLen = 0;
+
+        if (!::HMAC(EVP_sha256(), secret.data(), secret.size(), (unsigned char*)data.data(), data.size(),
+                    (unsigned char*)value.data(), &macLen))
+        {
+            return {};
+        }
+
+        if (macLen != EVP_MAX_MD_SIZE) {
+            value.resize(macLen);
+        }
+        return Bin2base64url(value);
+    }
+}
+
+namespace NTvmAuth::NInternal {
+    TMaybe<TInstant> TCanningKnife::GetExpirationTime(TStringBuf ticket) {
+        const TParserTickets::TRes res = TParserTickets::ParseV3(ticket, {}, TParserTickets::ServiceFlag());
+
+        return res.Status == ETicketStatus::MissingKey || res.Status == ETicketStatus::Expired
+                   ? TInstant::Seconds(res.Ticket.expirationtime())
+                   : TMaybe<TInstant>();
+    }
+}
diff --git a/library/cpp/tvmauth/src/utils.h b/library/cpp/tvmauth/src/utils.h
new file mode 100644
index 0000000000..e5847ac89f
--- /dev/null
+++ b/library/cpp/tvmauth/src/utils.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+#include <library/cpp/tvmauth/ticket_status.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/fwd.h>
+
+namespace NTvmAuth::NUtils {
+    TString Bin2base64url(TStringBuf buf);
+    TString Base64url2bin(TStringBuf buf);
+
+    TString SignCgiParamsForTvm(TStringBuf secret, TStringBuf ts, TStringBuf dstTvmId, TStringBuf scopes);
+}
+
+namespace NTvmAuth::NInternal {
+    class TCanningKnife {
+    public:
+        static TCheckedServiceTicket::TImpl* GetS(TCheckedServiceTicket& t) {
+            return t.Impl_.Release();
+        }
+
+        static TCheckedUserTicket::TImpl* GetU(TCheckedUserTicket& t) {
+            return t.Impl_.Release();
+        }
+
+        static TMaybe<TInstant> GetExpirationTime(TStringBuf ticket);
+    };
+}
diff --git a/library/cpp/tvmauth/src/version b/library/cpp/tvmauth/src/version
new file mode 100644
index 0000000000..4f5e69734c
--- /dev/null
+++ b/library/cpp/tvmauth/src/version
@@ -0,0 +1 @@
+3.4.5
diff --git a/library/cpp/tvmauth/src/version.cpp b/library/cpp/tvmauth/src/version.cpp
new file mode 100644
index 0000000000..6b389213d0
--- /dev/null
+++ b/library/cpp/tvmauth/src/version.cpp
@@ -0,0 +1,26 @@
+#include <library/cpp/resource/resource.h>
+
+#include <util/string/strip.h>
+
+namespace {
+    class TBuiltinVersion {
+    public:
+        TBuiltinVersion() {
+            Version_ = NResource::Find("/builtin/version");
+            StripInPlace(Version_);
+        }
+
+        TStringBuf Get() const {
+            return Version_;
+        }
+
+    private:
+        TString Version_;
+    };
+}
+
+namespace NTvmAuth {
+    TStringBuf LibVersion() {
+        return Singleton<TBuiltinVersion>()->Get();
+    }
+}
diff --git a/library/cpp/tvmauth/ticket_status.h b/library/cpp/tvmauth/ticket_status.h
new file mode 100644
index 0000000000..532d4de56e
--- /dev/null
+++ b/library/cpp/tvmauth/ticket_status.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <util/generic/strbuf.h>
+
+namespace NTvmAuth {
+    /*!
+     * Status mean result of ticket check
+     */
+    enum class ETicketStatus {
+        Ok,
+        Expired,
+        InvalidBlackboxEnv,
+        InvalidDst,
+        InvalidTicketType,
+        Malformed,
+        MissingKey,
+        SignBroken,
+        UnsupportedVersion,
+        NoRoles,
+    };
+
+    TStringBuf StatusToString(ETicketStatus st);
+}
diff --git a/library/cpp/tvmauth/type.h b/library/cpp/tvmauth/type.h
new file mode 100644
index 0000000000..7f4ce2b700
--- /dev/null
+++ b/library/cpp/tvmauth/type.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include <library/cpp/containers/stack_vector/stack_vec.h>
+
+namespace NTvmAuth {
+    using TScopes = TSmallVec<TStringBuf>;
+    using TTvmId = ui32;
+    using TUid = ui64;
+    using TUids = TSmallVec<TUid>;
+    using TAlias = TString;
+}
diff --git a/library/cpp/tvmauth/unittest.h b/library/cpp/tvmauth/unittest.h
new file mode 100644
index 0000000000..efa651befa
--- /dev/null
+++ b/library/cpp/tvmauth/unittest.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include "checked_service_ticket.h"
+#include "checked_user_ticket.h"
+
+#include <util/generic/maybe.h>
+
+namespace NTvmAuth::NUnittest {
+    static const TString TVMKNIFE_PUBLIC_KEYS = "1:CpgCCpMCCAEQABqIAjCCAQQCggEAcLEXeH67FQESFUn4_7wnX7wN0PUrBoUsm3QQ4W5vC-qz6sXaEjSwnTV8w1o-z6X9KPLlhzMQvuS38NCNfK4uvJ4Zvfp3YsXJ25-rYtbnrYJHNvHohD-kPCCw_yZpMp21JdWigzQGuV7CtrxUhF-NNrsnUaJrE5-OpEWNt4X6nCItKIYeVcSK6XJUbEWbrNCRbvkSc4ak2ymFeMuHYJVjxh4eQbk7_ZPzodP0WvF6eUYrYeb42imVEOR8ofVLQWE5DVnb1z_TqZm4i1XkS7jMwZuBxBRw8DGdYei0lT_sAf7KST2jC0590NySB3vsBgWEVs1OdUUWA6r-Dvx9dsOQtSCVkQYQAAqZAgqUAggCEAAaiQIwggEFAoIBAQDhEBM5-6YsPWfogKtbluJoCX1WV2KdzOaQ0-OlRbBzeCzw-eQKu12c8WakHBbeCMd1I1TU64SDkDorWjXGIa_2xT6N3zzNAE50roTbPCcmeQrps26woTYfYIuqDdoxYKZNr0lvNLLW47vBr7EKqo1S4KSj7aXK_XYeEvUgIgf3nVIcNrio7VTnFmGGVQCepaL1Hi1gN4yIXjVZ06PBPZ-DxSRu6xOGbFrfKMJeMPs7KOyE-26Q3xOXdTIa1X-zYIucTd_bxUCL4BVbwW2AvbbFsaG7ISmVdGu0XUTmhXs1KrEfUVLRJhE4Dx99hAZXm1_HlYMUeJcMQ_oHOhV94ENFIJaRBhACCpYBCpEBCAMQABqGATCBgwKBgF9t2YJGAJkRRFq6fWhi3m1TFW1UOE0f6ZrfYhHAkpqGlKlh0QVfeTNPpeJhi75xXzCe6oReRUm-0DbqDNhTShC7uGUv1INYnRBQWH6E-5Fc5XrbDFSuGQw2EYjNfHy_HefHJXxQKAqPvxBDKMKkHgV58WtM6rC8jRi9sdX_ig2NIJeRBhABCpYBCpEBCAQQABqGATCBgwKBgGB4d6eLGUBv-Q6EPLehC4S-yuE2HB-_rJ7WkeYwyp-xIPolPrd-PQme2utHB4ZgpXHIu_OFksDe_0bPgZniNRSVRbl7W49DgS5Ya3kMfrYB4DnF5Fta5tn1oV6EwxYD4JONpFTenOJALPGTPawxXEfon_peiHOSBuQMu3_Vn-l1IJiRBhADCpcBCpIBCAUQABqHATCBhAKBgQCTJMKIfmfeZpaI7Q9rnsc29gdWawK7TnpVKRHws1iY7EUlYROeVcMdAwEqVM6f8BVCKLGgzQ7Gar_uuxfUGKwqEQzoppDraw4F75J464-7D5f6_oJQuGIBHZxqbMONtLjBCXRUhQW5szBLmTQ_R3qaJb5vf-h0APZfkYhq1cTttSCZkQYQBAqWAQqRAQgLEAAahgEwgYMCgYBvvGVH_M2H8qxxv94yaDYUTWbRnJ1uiIYc59KIQlfFimMPhSS7x2tqUa2-hI55JiII0Xym6GNkwLhyc1xtWChpVuIdSnbvttbrt4weDMLHqTwNOF6qAsVKGKT1Yh8yf-qb-DSmicgvFc74mBQm_6gAY1iQsf33YX8578ClhKBWHSCVkQYQAAqXAQqSAQgMEAAahwEwgYQCgYEAkuzFcd5TJu7lYWYe2hQLFfUWIIj91BvQQLa_Thln4YtGCO8gG1KJqJm-YlmJOWQG0B7H_5RVhxUxV9KpmFnsDVkzUFKOsCBaYGXc12xPVioawUlAwp5qp3QQtZyx_se97YIoLzuLr46UkLcLnkIrp-Jo46QzYi_QHq45WTm8MQ0glpEGEAIKlwEKkgEIDRAAGocBMIGEAoGBAIUzbxOknXf_rNt17_ir8JlWvrtnCWsQd1MAnl5mgArvavDtKeBYHzi5_Ak7DHlLzuA6YE8W175FxLFKpN2hkz-l-M7ltUSd8N1BvJRhK4t6WffWfC_1wPyoAbeSN2Yb1jygtZJQ8wGoXHcJQUXiMit3eFNyylwsJFj1gzAR4JCdIJeRBhABCpYBCpEBCA4QABqGATCBgwKBgFMcbEpl9ukVR6AO_R6sMyiU11I8b8MBSUCEC15iKsrVO8v_m47_TRRjWPYtQ9eZ7o1ocNJHaGUU7qqInFqtFaVnIceP6NmCsXhjs3MLrWPS8IRAy4Zf4FKmGOx3N9O2vemjUygZ9vUiSkULdVrecinRaT8JQ5RG4bUMY04XGIwFIJiRBhADCpYBCpEBCA8QABqGATCBgwKBgGpCkW-NR3li8GlRvqpq2YZGSIgm_PTyDI2Zwfw69grsBmPpVFW48Vw7xoMN35zcrojEpialB_uQzlpLYOvsMl634CRIuj-n1QE3-gaZTTTE8mg-AR4mcxnTKThPnRQpbuOlYAnriwiasWiQEMbGjq_HmWioYYxFo9USlklQn4-9IJmRBhAEEpUBCpIBCAYQABqHATCBhAKBgQCoZkFGm9oLTqjeXZAq6j5S6i7K20V0lNdBBLqfmFBIRuTkYxhs4vUYnWjZrKRAd5bp6_py0csmFmpl_5Yh0b-2pdo_E5PNP7LGRzKyKSiFddyykKKzVOazH8YYldDAfE8Z5HoS9e48an5JsPg0jr-TPu34DnJq3yv2a6dqiKL9zSCakQYSlQEKkgEIEBAAGocBMIGEAoGBALhrihbf3EpjDQS2sCQHazoFgN0nBbE9eesnnFTfzQELXb2gnJU9enmV_aDqaHKjgtLIPpCgn40lHrn5k6mvH5OdedyI6cCzE-N-GFp3nAq0NDJyMe0fhtIRD__CbT0ulcvkeow65ubXWfw6dBC2gR_34rdMe_L_TGRLMWjDULbNIJqRBg";
+
+    TCheckedServiceTicket CreateServiceTicket(ETicketStatus status,
+                                              TTvmId src,
+                                              TMaybe<TUid> issuerUid = TMaybe<TUid>());
+
+    TCheckedUserTicket CreateUserTicket(ETicketStatus status,
+                                        TUid defaultUid,
+                                        const TScopes& scopes,
+                                        const TUids& uids = TUids(),
+                                        EBlackboxEnv env = EBlackboxEnv::Test);
+}
diff --git a/library/cpp/tvmauth/utils.cpp b/library/cpp/tvmauth/utils.cpp
new file mode 100644
index 0000000000..a06cd6f5ba
--- /dev/null
+++ b/library/cpp/tvmauth/utils.cpp
@@ -0,0 +1,18 @@
+#include "utils.h"
+
+namespace NTvmAuth::NUtils {
+    TStringBuf RemoveTicketSignature(TStringBuf ticketBody) {
+        if (ticketBody.size() < 2 ||
+            ticketBody[0] != '3' ||
+            ticketBody[1] != ':') {
+            return ticketBody;
+        }
+
+        size_t pos = ticketBody.rfind(':');
+        if (pos == TStringBuf::npos) { // impossible
+            return ticketBody;
+        }
+
+        return ticketBody.substr(0, pos + 1);
+    }
+}
diff --git a/library/cpp/tvmauth/utils.h b/library/cpp/tvmauth/utils.h
new file mode 100644
index 0000000000..ad8950cab5
--- /dev/null
+++ b/library/cpp/tvmauth/utils.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <util/generic/strbuf.h>
+
+namespace NTvmAuth::NUtils {
+    /*!
+     * Remove signature from ticket string - rest part can be parsed later with `tvmknife parse_ticket ...`
+     * @param ticketBody Raw ticket body
+     * @return safe for logging part of ticket
+     */
+    TStringBuf RemoveTicketSignature(TStringBuf ticketBody);
+}
diff --git a/library/cpp/tvmauth/version.h b/library/cpp/tvmauth/version.h
new file mode 100644
index 0000000000..48ec279829
--- /dev/null
+++ b/library/cpp/tvmauth/version.h
@@ -0,0 +1,7 @@
+#pragma once
+
+#include <util/generic/strbuf.h>
+
+namespace NTvmAuth {
+    TStringBuf LibVersion();
+}