Support BS autoconfig KIKIMR-19031

1 files changed, 61 insertions, 0 deletions

diff --git a/library/cpp/openssl/big_integer/big_integer.cpp b/library/cpp/openssl/big_integer/big_integer.cpp
new file mode 100644
index 0000000000..9b6802369a
--- /dev/null
+++ b/library/cpp/openssl/big_integer/big_integer.cpp
@@ -0,0 +1,61 @@
+#include "big_integer.h"
+
+#include <util/generic/yexception.h>
+#include <util/generic/scope.h>
+#include <util/stream/output.h>
+
+#include <openssl/bn.h>
+
+using namespace NOpenSsl;
+
+TBigInteger::~TBigInteger() noexcept {
+    BN_free(Impl_);
+}
+
+TBigInteger TBigInteger::FromULong(ui64 value) {
+    TBigInteger result(BN_new());
+
+    Y_ENSURE(result.Impl(), "BN_new() failed");
+    Y_ENSURE(BN_set_word(result.Impl(), value) == 1, "BN_set_word() failed");
+
+    return result;
+}
+
+TBigInteger TBigInteger::FromRegion(const void* ptr, size_t len) {
+    auto result = BN_bin2bn((ui8*)(ptr), len, nullptr);
+
+    Y_ENSURE(result, "BN_bin2bn() failed");
+
+    return result;
+}
+
+int TBigInteger::Compare(const TBigInteger& a, const TBigInteger& b) noexcept {
+    return BN_cmp(a.Impl(), b.Impl());
+}
+
+size_t TBigInteger::NumBytes() const noexcept {
+    return BN_num_bytes(Impl_);
+}
+
+size_t TBigInteger::ToRegion(void* to) const noexcept {
+    const auto ret = BN_bn2bin(Impl_, (unsigned char*)to);
+
+    Y_VERIFY(ret >= 0, "it happens");
+
+    return ret;
+}
+
+TString TBigInteger::ToDecimalString() const {
+    auto res = BN_bn2dec(Impl_);
+
+    Y_DEFER {
+        OPENSSL_free(res);
+    };
+
+    return res;
+}
+
+template <>
+void Out<TBigInteger>(IOutputStream& out, const TBigInteger& bi) {
+    out << bi.ToDecimalString();
+}