Restoring authorship annotation for <deshevoy@yandex-team.ru>. Commit 2 of 2.

1 files changed, 785 insertions, 785 deletions

diff --git a/contrib/libs/openssl/engines/e_dasync.c b/contrib/libs/openssl/engines/e_dasync.c
index 823cbe3cd0..5cdacb66a0 100644
--- a/contrib/libs/openssl/engines/e_dasync.c
+++ b/contrib/libs/openssl/engines/e_dasync.c
@@ -1,785 +1,785 @@
-/* 
- * Copyright 2015-2019 The OpenSSL Project Authors. All Rights Reserved. 
- * 
- * Licensed under the OpenSSL license (the "License").  You may not use 
- * this file except in compliance with the License.  You can obtain a copy 
- * in the file LICENSE in the source distribution or at 
- * https://www.openssl.org/source/license.html 
- */ 
- 
-#if defined(_WIN32) 
-# include <windows.h> 
-#endif 
- 
-#include <stdio.h> 
-#include <string.h> 
- 
-#include <openssl/engine.h> 
-#include <openssl/sha.h> 
-#include <openssl/aes.h> 
-#include <openssl/rsa.h> 
-#include <openssl/evp.h> 
-#include <openssl/async.h> 
-#include <openssl/bn.h> 
-#include <openssl/crypto.h> 
-#include <openssl/ssl.h> 
-#include <openssl/modes.h> 
- 
-#if defined(OPENSSL_SYS_UNIX) && defined(OPENSSL_THREADS) 
-# undef ASYNC_POSIX 
-# define ASYNC_POSIX 
-# include <unistd.h> 
-#elif defined(_WIN32) 
-# undef ASYNC_WIN 
-# define ASYNC_WIN 
-#endif 
- 
-#include "e_dasync_err.c" 
- 
-/* Engine Id and Name */ 
-static const char *engine_dasync_id = "dasync"; 
-static const char *engine_dasync_name = "Dummy Async engine support"; 
- 
- 
-/* Engine Lifetime functions */ 
-static int dasync_destroy(ENGINE *e); 
-static int dasync_init(ENGINE *e); 
-static int dasync_finish(ENGINE *e); 
-void engine_load_dasync_int(void); 
- 
- 
-/* Set up digests. Just SHA1 for now */ 
-static int dasync_digests(ENGINE *e, const EVP_MD **digest, 
-                          const int **nids, int nid); 
- 
-static void dummy_pause_job(void); 
- 
-/* SHA1 */ 
-static int dasync_sha1_init(EVP_MD_CTX *ctx); 
-static int dasync_sha1_update(EVP_MD_CTX *ctx, const void *data, 
-                             size_t count); 
-static int dasync_sha1_final(EVP_MD_CTX *ctx, unsigned char *md); 
- 
-/* 
- * Holds the EVP_MD object for sha1 in this engine. Set up once only during 
- * engine bind and can then be reused many times. 
- */ 
-static EVP_MD *_hidden_sha1_md = NULL; 
-static const EVP_MD *dasync_sha1(void) 
-{ 
-    return _hidden_sha1_md; 
-} 
-static void destroy_digests(void) 
-{ 
-    EVP_MD_meth_free(_hidden_sha1_md); 
-    _hidden_sha1_md = NULL; 
-} 
- 
-static int dasync_digest_nids(const int **nids) 
-{ 
-    static int digest_nids[2] = { 0, 0 }; 
-    static int pos = 0; 
-    static int init = 0; 
- 
-    if (!init) { 
-        const EVP_MD *md; 
-        if ((md = dasync_sha1()) != NULL) 
-            digest_nids[pos++] = EVP_MD_type(md); 
-        digest_nids[pos] = 0; 
-        init = 1; 
-    } 
-    *nids = digest_nids; 
-    return pos; 
-} 
- 
-/* RSA */ 
- 
-static int dasync_pub_enc(int flen, const unsigned char *from, 
-                    unsigned char *to, RSA *rsa, int padding); 
-static int dasync_pub_dec(int flen, const unsigned char *from, 
-                    unsigned char *to, RSA *rsa, int padding); 
-static int dasync_rsa_priv_enc(int flen, const unsigned char *from, 
-                      unsigned char *to, RSA *rsa, int padding); 
-static int dasync_rsa_priv_dec(int flen, const unsigned char *from, 
-                      unsigned char *to, RSA *rsa, int padding); 
-static int dasync_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, 
-                              BN_CTX *ctx); 
- 
-static int dasync_rsa_init(RSA *rsa); 
-static int dasync_rsa_finish(RSA *rsa); 
- 
-static RSA_METHOD *dasync_rsa_method = NULL; 
- 
-/* AES */ 
- 
-static int dasync_aes128_cbc_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, 
-                                  void *ptr); 
-static int dasync_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 
-                                  const unsigned char *iv, int enc); 
-static int dasync_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 
-                                    const unsigned char *in, size_t inl); 
-static int dasync_aes128_cbc_cleanup(EVP_CIPHER_CTX *ctx); 
- 
-static int dasync_aes128_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, 
-                                             int arg, void *ptr); 
-static int dasync_aes128_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx, 
-                                                 const unsigned char *key, 
-                                                 const unsigned char *iv, 
-                                                 int enc); 
-static int dasync_aes128_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx, 
-                                               unsigned char *out, 
-                                               const unsigned char *in, 
-                                               size_t inl); 
-static int dasync_aes128_cbc_hmac_sha1_cleanup(EVP_CIPHER_CTX *ctx); 
- 
-struct dasync_pipeline_ctx { 
-    void *inner_cipher_data; 
-    unsigned int numpipes; 
-    unsigned char **inbufs; 
-    unsigned char **outbufs; 
-    size_t *lens; 
-    unsigned char tlsaad[SSL_MAX_PIPELINES][EVP_AEAD_TLS1_AAD_LEN]; 
-    unsigned int aadctr; 
-}; 
- 
-/* 
- * Holds the EVP_CIPHER object for aes_128_cbc in this engine. Set up once only 
- * during engine bind and can then be reused many times. 
- */ 
-static EVP_CIPHER *_hidden_aes_128_cbc = NULL; 
-static const EVP_CIPHER *dasync_aes_128_cbc(void) 
-{ 
-    return _hidden_aes_128_cbc; 
-} 
- 
-/* 
- * Holds the EVP_CIPHER object for aes_128_cbc_hmac_sha1 in this engine. Set up 
- * once only during engine bind and can then be reused many times. 
- * 
- * This 'stitched' cipher depends on the EVP_aes_128_cbc_hmac_sha1() cipher, 
- * which is implemented only if the AES-NI instruction set extension is available 
- * (see OPENSSL_IA32CAP(3)). If that's not the case, then this cipher will not 
- * be available either. 
- * 
- * Note: Since it is a legacy mac-then-encrypt cipher, modern TLS peers (which 
- * negotiate the encrypt-then-mac extension) won't negotiate it anyway. 
- */ 
-static EVP_CIPHER *_hidden_aes_128_cbc_hmac_sha1 = NULL; 
-static const EVP_CIPHER *dasync_aes_128_cbc_hmac_sha1(void) 
-{ 
-    return _hidden_aes_128_cbc_hmac_sha1; 
-} 
- 
-static void destroy_ciphers(void) 
-{ 
-    EVP_CIPHER_meth_free(_hidden_aes_128_cbc); 
-    EVP_CIPHER_meth_free(_hidden_aes_128_cbc_hmac_sha1); 
-    _hidden_aes_128_cbc = NULL; 
-    _hidden_aes_128_cbc_hmac_sha1 = NULL; 
-} 
- 
-static int dasync_ciphers(ENGINE *e, const EVP_CIPHER **cipher, 
-                                   const int **nids, int nid); 
- 
-static int dasync_cipher_nids[] = { 
-    NID_aes_128_cbc, 
-    NID_aes_128_cbc_hmac_sha1, 
-    0 
-}; 
- 
-static int bind_dasync(ENGINE *e) 
-{ 
-    /* Setup RSA_METHOD */ 
-    if ((dasync_rsa_method = RSA_meth_new("Dummy Async RSA method", 0)) == NULL 
-        || RSA_meth_set_pub_enc(dasync_rsa_method, dasync_pub_enc) == 0 
-        || RSA_meth_set_pub_dec(dasync_rsa_method, dasync_pub_dec) == 0 
-        || RSA_meth_set_priv_enc(dasync_rsa_method, dasync_rsa_priv_enc) == 0 
-        || RSA_meth_set_priv_dec(dasync_rsa_method, dasync_rsa_priv_dec) == 0 
-        || RSA_meth_set_mod_exp(dasync_rsa_method, dasync_rsa_mod_exp) == 0 
-        || RSA_meth_set_bn_mod_exp(dasync_rsa_method, BN_mod_exp_mont) == 0 
-        || RSA_meth_set_init(dasync_rsa_method, dasync_rsa_init) == 0 
-        || RSA_meth_set_finish(dasync_rsa_method, dasync_rsa_finish) == 0) { 
-        DASYNCerr(DASYNC_F_BIND_DASYNC, DASYNC_R_INIT_FAILED); 
-        return 0; 
-    } 
- 
-    /* Ensure the dasync error handling is set up */ 
-    ERR_load_DASYNC_strings(); 
- 
-    if (!ENGINE_set_id(e, engine_dasync_id) 
-        || !ENGINE_set_name(e, engine_dasync_name) 
-        || !ENGINE_set_RSA(e, dasync_rsa_method) 
-        || !ENGINE_set_digests(e, dasync_digests) 
-        || !ENGINE_set_ciphers(e, dasync_ciphers) 
-        || !ENGINE_set_destroy_function(e, dasync_destroy) 
-        || !ENGINE_set_init_function(e, dasync_init) 
-        || !ENGINE_set_finish_function(e, dasync_finish)) { 
-        DASYNCerr(DASYNC_F_BIND_DASYNC, DASYNC_R_INIT_FAILED); 
-        return 0; 
-    } 
- 
-    /* 
-     * Set up the EVP_CIPHER and EVP_MD objects for the ciphers/digests 
-     * supplied by this engine 
-     */ 
-    _hidden_sha1_md = EVP_MD_meth_new(NID_sha1, NID_sha1WithRSAEncryption); 
-    if (_hidden_sha1_md == NULL 
-        || !EVP_MD_meth_set_result_size(_hidden_sha1_md, SHA_DIGEST_LENGTH) 
-        || !EVP_MD_meth_set_input_blocksize(_hidden_sha1_md, SHA_CBLOCK) 
-        || !EVP_MD_meth_set_app_datasize(_hidden_sha1_md, 
-                                         sizeof(EVP_MD *) + sizeof(SHA_CTX)) 
-        || !EVP_MD_meth_set_flags(_hidden_sha1_md, EVP_MD_FLAG_DIGALGID_ABSENT) 
-        || !EVP_MD_meth_set_init(_hidden_sha1_md, dasync_sha1_init) 
-        || !EVP_MD_meth_set_update(_hidden_sha1_md, dasync_sha1_update) 
-        || !EVP_MD_meth_set_final(_hidden_sha1_md, dasync_sha1_final)) { 
-        EVP_MD_meth_free(_hidden_sha1_md); 
-        _hidden_sha1_md = NULL; 
-    } 
- 
-    _hidden_aes_128_cbc = EVP_CIPHER_meth_new(NID_aes_128_cbc, 
-                                              16 /* block size */, 
-                                              16 /* key len */); 
-    if (_hidden_aes_128_cbc == NULL 
-            || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc,16) 
-            || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc, 
-                                          EVP_CIPH_FLAG_DEFAULT_ASN1 
-                                          | EVP_CIPH_CBC_MODE 
-                                          | EVP_CIPH_FLAG_PIPELINE) 
-            || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc, 
-                                         dasync_aes128_init_key) 
-            || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc, 
-                                              dasync_aes128_cbc_cipher) 
-            || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc, 
-                                            dasync_aes128_cbc_cleanup) 
-            || !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_cbc, 
-                                         dasync_aes128_cbc_ctrl) 
-            || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc, 
-                                sizeof(struct dasync_pipeline_ctx))) { 
-        EVP_CIPHER_meth_free(_hidden_aes_128_cbc); 
-        _hidden_aes_128_cbc = NULL; 
-    } 
- 
-    _hidden_aes_128_cbc_hmac_sha1 = EVP_CIPHER_meth_new( 
-                                                NID_aes_128_cbc_hmac_sha1, 
-                                                16 /* block size */, 
-                                                16 /* key len */); 
-    if (_hidden_aes_128_cbc_hmac_sha1 == NULL 
-            || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc_hmac_sha1,16) 
-            || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc_hmac_sha1, 
-                                            EVP_CIPH_CBC_MODE 
-                                          | EVP_CIPH_FLAG_DEFAULT_ASN1 
-                                          | EVP_CIPH_FLAG_AEAD_CIPHER 
-                                          | EVP_CIPH_FLAG_PIPELINE) 
-            || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc_hmac_sha1, 
-                                         dasync_aes128_cbc_hmac_sha1_init_key) 
-            || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc_hmac_sha1, 
-                                            dasync_aes128_cbc_hmac_sha1_cipher) 
-            || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc_hmac_sha1, 
-                                            dasync_aes128_cbc_hmac_sha1_cleanup) 
-            || !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_cbc_hmac_sha1, 
-                                         dasync_aes128_cbc_hmac_sha1_ctrl) 
-            || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc_hmac_sha1, 
-                                sizeof(struct dasync_pipeline_ctx))) { 
-        EVP_CIPHER_meth_free(_hidden_aes_128_cbc_hmac_sha1); 
-        _hidden_aes_128_cbc_hmac_sha1 = NULL; 
-    } 
- 
-    return 1; 
-} 
- 
-# ifndef OPENSSL_NO_DYNAMIC_ENGINE 
-static int bind_helper(ENGINE *e, const char *id) 
-{ 
-    if (id && (strcmp(id, engine_dasync_id) != 0)) 
-        return 0; 
-    if (!bind_dasync(e)) 
-        return 0; 
-    return 1; 
-} 
- 
-IMPLEMENT_DYNAMIC_CHECK_FN() 
-    IMPLEMENT_DYNAMIC_BIND_FN(bind_helper) 
-# endif 
- 
-static ENGINE *engine_dasync(void) 
-{ 
-    ENGINE *ret = ENGINE_new(); 
-    if (!ret) 
-        return NULL; 
-    if (!bind_dasync(ret)) { 
-        ENGINE_free(ret); 
-        return NULL; 
-    } 
-    return ret; 
-} 
- 
-void engine_load_dasync_int(void) 
-{ 
-    ENGINE *toadd = engine_dasync(); 
-    if (!toadd) 
-        return; 
-    ENGINE_add(toadd); 
-    ENGINE_free(toadd); 
-    ERR_clear_error(); 
-} 
- 
-static int dasync_init(ENGINE *e) 
-{ 
-    return 1; 
-} 
- 
- 
-static int dasync_finish(ENGINE *e) 
-{ 
-    return 1; 
-} 
- 
- 
-static int dasync_destroy(ENGINE *e) 
-{ 
-    destroy_digests(); 
-    destroy_ciphers(); 
-    RSA_meth_free(dasync_rsa_method); 
-    ERR_unload_DASYNC_strings(); 
-    return 1; 
-} 
- 
-static int dasync_digests(ENGINE *e, const EVP_MD **digest, 
-                          const int **nids, int nid) 
-{ 
-    int ok = 1; 
-    if (!digest) { 
-        /* We are returning a list of supported nids */ 
-        return dasync_digest_nids(nids); 
-    } 
-    /* We are being asked for a specific digest */ 
-    switch (nid) { 
-    case NID_sha1: 
-        *digest = dasync_sha1(); 
-        break; 
-    default: 
-        ok = 0; 
-        *digest = NULL; 
-        break; 
-    } 
-    return ok; 
-} 
- 
-static int dasync_ciphers(ENGINE *e, const EVP_CIPHER **cipher, 
-                                   const int **nids, int nid) 
-{ 
-    int ok = 1; 
-    if (cipher == NULL) { 
-        /* We are returning a list of supported nids */ 
-        *nids = dasync_cipher_nids; 
-        return (sizeof(dasync_cipher_nids) - 
-                1) / sizeof(dasync_cipher_nids[0]); 
-    } 
-    /* We are being asked for a specific cipher */ 
-    switch (nid) { 
-    case NID_aes_128_cbc: 
-        *cipher = dasync_aes_128_cbc(); 
-        break; 
-    case NID_aes_128_cbc_hmac_sha1: 
-        *cipher = dasync_aes_128_cbc_hmac_sha1(); 
-        break; 
-    default: 
-        ok = 0; 
-        *cipher = NULL; 
-        break; 
-    } 
-    return ok; 
-} 
- 
-static void wait_cleanup(ASYNC_WAIT_CTX *ctx, const void *key, 
-                         OSSL_ASYNC_FD readfd, void *pvwritefd) 
-{ 
-    OSSL_ASYNC_FD *pwritefd = (OSSL_ASYNC_FD *)pvwritefd; 
-#if defined(ASYNC_WIN) 
-    CloseHandle(readfd); 
-    CloseHandle(*pwritefd); 
-#elif defined(ASYNC_POSIX) 
-    close(readfd); 
-    close(*pwritefd); 
-#endif 
-    OPENSSL_free(pwritefd); 
-} 
- 
-#define DUMMY_CHAR 'X' 
- 
-static void dummy_pause_job(void) { 
-    ASYNC_JOB *job; 
-    ASYNC_WAIT_CTX *waitctx; 
-    OSSL_ASYNC_FD pipefds[2] = {0, 0}; 
-    OSSL_ASYNC_FD *writefd; 
-#if defined(ASYNC_WIN) 
-    DWORD numwritten, numread; 
-    char buf = DUMMY_CHAR; 
-#elif defined(ASYNC_POSIX) 
-    char buf = DUMMY_CHAR; 
-#endif 
- 
-    if ((job = ASYNC_get_current_job()) == NULL) 
-        return; 
- 
-    waitctx = ASYNC_get_wait_ctx(job); 
- 
-    if (ASYNC_WAIT_CTX_get_fd(waitctx, engine_dasync_id, &pipefds[0], 
-                              (void **)&writefd)) { 
-        pipefds[1] = *writefd; 
-    } else { 
-        writefd = OPENSSL_malloc(sizeof(*writefd)); 
-        if (writefd == NULL) 
-            return; 
-#if defined(ASYNC_WIN) 
-        if (CreatePipe(&pipefds[0], &pipefds[1], NULL, 256) == 0) { 
-            OPENSSL_free(writefd); 
-            return; 
-        } 
-#elif defined(ASYNC_POSIX) 
-        if (pipe(pipefds) != 0) { 
-            OPENSSL_free(writefd); 
-            return; 
-        } 
-#endif 
-        *writefd = pipefds[1]; 
- 
-        if (!ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_dasync_id, pipefds[0], 
-                                        writefd, wait_cleanup)) { 
-            wait_cleanup(waitctx, engine_dasync_id, pipefds[0], writefd); 
-            return; 
-        } 
-    } 
-    /* 
-     * In the Dummy async engine we are cheating. We signal that the job 
-     * is complete by waking it before the call to ASYNC_pause_job(). A real 
-     * async engine would only wake when the job was actually complete 
-     */ 
-#if defined(ASYNC_WIN) 
-    WriteFile(pipefds[1], &buf, 1, &numwritten, NULL); 
-#elif defined(ASYNC_POSIX) 
-    if (write(pipefds[1], &buf, 1) < 0) 
-        return; 
-#endif 
- 
-    /* Ignore errors - we carry on anyway */ 
-    ASYNC_pause_job(); 
- 
-    /* Clear the wake signal */ 
-#if defined(ASYNC_WIN) 
-    ReadFile(pipefds[0], &buf, 1, &numread, NULL); 
-#elif defined(ASYNC_POSIX) 
-    if (read(pipefds[0], &buf, 1) < 0) 
-        return; 
-#endif 
-} 
- 
-/* 
- * SHA1 implementation. At the moment we just defer to the standard 
- * implementation 
- */ 
-#undef data 
-#define data(ctx) ((SHA_CTX *)EVP_MD_CTX_md_data(ctx)) 
-static int dasync_sha1_init(EVP_MD_CTX *ctx) 
-{ 
-    dummy_pause_job(); 
- 
-    return SHA1_Init(data(ctx)); 
-} 
- 
-static int dasync_sha1_update(EVP_MD_CTX *ctx, const void *data, 
-                             size_t count) 
-{ 
-    dummy_pause_job(); 
- 
-    return SHA1_Update(data(ctx), data, (size_t)count); 
-} 
- 
-static int dasync_sha1_final(EVP_MD_CTX *ctx, unsigned char *md) 
-{ 
-    dummy_pause_job(); 
- 
-    return SHA1_Final(md, data(ctx)); 
-} 
- 
-/* 
- * RSA implementation 
- */ 
- 
-static int dasync_pub_enc(int flen, const unsigned char *from, 
-                    unsigned char *to, RSA *rsa, int padding) { 
-    /* Ignore errors - we carry on anyway */ 
-    dummy_pause_job(); 
-    return RSA_meth_get_pub_enc(RSA_PKCS1_OpenSSL()) 
-        (flen, from, to, rsa, padding); 
-} 
- 
-static int dasync_pub_dec(int flen, const unsigned char *from, 
-                    unsigned char *to, RSA *rsa, int padding) { 
-    /* Ignore errors - we carry on anyway */ 
-    dummy_pause_job(); 
-    return RSA_meth_get_pub_dec(RSA_PKCS1_OpenSSL()) 
-        (flen, from, to, rsa, padding); 
-} 
- 
-static int dasync_rsa_priv_enc(int flen, const unsigned char *from, 
-                      unsigned char *to, RSA *rsa, int padding) 
-{ 
-    /* Ignore errors - we carry on anyway */ 
-    dummy_pause_job(); 
-    return RSA_meth_get_priv_enc(RSA_PKCS1_OpenSSL()) 
-        (flen, from, to, rsa, padding); 
-} 
- 
-static int dasync_rsa_priv_dec(int flen, const unsigned char *from, 
-                      unsigned char *to, RSA *rsa, int padding) 
-{ 
-    /* Ignore errors - we carry on anyway */ 
-    dummy_pause_job(); 
-    return RSA_meth_get_priv_dec(RSA_PKCS1_OpenSSL()) 
-        (flen, from, to, rsa, padding); 
-} 
- 
-static int dasync_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx) 
-{ 
-    /* Ignore errors - we carry on anyway */ 
-    dummy_pause_job(); 
-    return RSA_meth_get_mod_exp(RSA_PKCS1_OpenSSL())(r0, I, rsa, ctx); 
-} 
- 
-static int dasync_rsa_init(RSA *rsa) 
-{ 
-    return RSA_meth_get_init(RSA_PKCS1_OpenSSL())(rsa); 
-} 
-static int dasync_rsa_finish(RSA *rsa) 
-{ 
-    return RSA_meth_get_finish(RSA_PKCS1_OpenSSL())(rsa); 
-} 
- 
-/* Cipher helper functions */ 
- 
-static int dasync_cipher_ctrl_helper(EVP_CIPHER_CTX *ctx, int type, int arg, 
-                                     void *ptr, int aeadcapable) 
-{ 
-    int ret; 
-    struct dasync_pipeline_ctx *pipe_ctx = 
-        (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); 
- 
-    if (pipe_ctx == NULL) 
-        return 0; 
- 
-    switch (type) { 
-        case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: 
-            pipe_ctx->numpipes = arg; 
-            pipe_ctx->outbufs = (unsigned char **)ptr; 
-            break; 
- 
-        case EVP_CTRL_SET_PIPELINE_INPUT_BUFS: 
-            pipe_ctx->numpipes = arg; 
-            pipe_ctx->inbufs = (unsigned char **)ptr; 
-            break; 
- 
-        case EVP_CTRL_SET_PIPELINE_INPUT_LENS: 
-            pipe_ctx->numpipes = arg; 
-            pipe_ctx->lens = (size_t *)ptr; 
-            break; 
- 
-        case EVP_CTRL_AEAD_SET_MAC_KEY: 
-            if (!aeadcapable) 
-                return -1; 
-            EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data); 
-            ret = EVP_CIPHER_meth_get_ctrl(EVP_aes_128_cbc_hmac_sha1()) 
-                                          (ctx, type, arg, ptr); 
-            EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx); 
-            return ret; 
- 
-        case EVP_CTRL_AEAD_TLS1_AAD: 
-        { 
-            unsigned char *p = ptr; 
-            unsigned int len; 
- 
-            if (!aeadcapable || arg != EVP_AEAD_TLS1_AAD_LEN) 
-                return -1; 
- 
-            if (pipe_ctx->aadctr >= SSL_MAX_PIPELINES) 
-                return -1; 
- 
-            memcpy(pipe_ctx->tlsaad[pipe_ctx->aadctr], ptr, 
-                   EVP_AEAD_TLS1_AAD_LEN); 
-            pipe_ctx->aadctr++; 
- 
-            len = p[arg - 2] << 8 | p[arg - 1]; 
- 
-            if (EVP_CIPHER_CTX_encrypting(ctx)) { 
-                if ((p[arg - 4] << 8 | p[arg - 3]) >= TLS1_1_VERSION) { 
-                    if (len < AES_BLOCK_SIZE) 
-                        return 0; 
-                    len -= AES_BLOCK_SIZE; 
-                } 
- 
-                return ((len + SHA_DIGEST_LENGTH + AES_BLOCK_SIZE) 
-                        & -AES_BLOCK_SIZE) - len; 
-            } else { 
-                return SHA_DIGEST_LENGTH; 
-            } 
-        } 
- 
-        default: 
-            return 0; 
-    } 
- 
-    return 1; 
-} 
- 
-static int dasync_cipher_init_key_helper(EVP_CIPHER_CTX *ctx, 
-                                         const unsigned char *key, 
-                                         const unsigned char *iv, int enc, 
-                                         const EVP_CIPHER *cipher) 
-{ 
-    int ret; 
-    struct dasync_pipeline_ctx *pipe_ctx = 
-        (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); 
- 
-    if (pipe_ctx->inner_cipher_data == NULL 
-            && EVP_CIPHER_impl_ctx_size(cipher) != 0) { 
-        pipe_ctx->inner_cipher_data = OPENSSL_zalloc( 
-            EVP_CIPHER_impl_ctx_size(cipher)); 
-        if (pipe_ctx->inner_cipher_data == NULL) { 
-            DASYNCerr(DASYNC_F_DASYNC_CIPHER_INIT_KEY_HELPER, 
-                        ERR_R_MALLOC_FAILURE); 
-            return 0; 
-        } 
-    } 
- 
-    pipe_ctx->numpipes = 0; 
-    pipe_ctx->aadctr = 0; 
- 
-    EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data); 
-    ret = EVP_CIPHER_meth_get_init(cipher)(ctx, key, iv, enc); 
-    EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx); 
- 
-    return ret; 
-} 
- 
-static int dasync_cipher_helper(EVP_CIPHER_CTX *ctx, unsigned char *out, 
-                                const unsigned char *in, size_t inl, 
-                                const EVP_CIPHER *cipher) 
-{ 
-    int ret = 1; 
-    unsigned int i, pipes; 
-    struct dasync_pipeline_ctx *pipe_ctx = 
-        (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); 
- 
-    pipes = pipe_ctx->numpipes; 
-    EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data); 
-    if (pipes == 0) { 
-        if (pipe_ctx->aadctr != 0) { 
-            if (pipe_ctx->aadctr != 1) 
-                return -1; 
-            EVP_CIPHER_meth_get_ctrl(cipher) 
-                                    (ctx, EVP_CTRL_AEAD_TLS1_AAD, 
-                                     EVP_AEAD_TLS1_AAD_LEN, 
-                                     pipe_ctx->tlsaad[0]); 
-        } 
-        ret = EVP_CIPHER_meth_get_do_cipher(cipher) 
-                                           (ctx, out, in, inl); 
-    } else { 
-        if (pipe_ctx->aadctr > 0 && pipe_ctx->aadctr != pipes) 
-            return -1; 
-        for (i = 0; i < pipes; i++) { 
-            if (pipe_ctx->aadctr > 0) { 
-                EVP_CIPHER_meth_get_ctrl(cipher) 
-                                        (ctx, EVP_CTRL_AEAD_TLS1_AAD, 
-                                         EVP_AEAD_TLS1_AAD_LEN, 
-                                         pipe_ctx->tlsaad[i]); 
-            } 
-            ret = ret && EVP_CIPHER_meth_get_do_cipher(cipher) 
-                                (ctx, pipe_ctx->outbufs[i], pipe_ctx->inbufs[i], 
-                                 pipe_ctx->lens[i]); 
-        } 
-        pipe_ctx->numpipes = 0; 
-    } 
-    pipe_ctx->aadctr = 0; 
-    EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx); 
-    return ret; 
-} 
- 
-static int dasync_cipher_cleanup_helper(EVP_CIPHER_CTX *ctx, 
-                                        const EVP_CIPHER *cipher) 
-{ 
-    struct dasync_pipeline_ctx *pipe_ctx = 
-        (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); 
- 
-    OPENSSL_clear_free(pipe_ctx->inner_cipher_data, 
-                       EVP_CIPHER_impl_ctx_size(cipher)); 
- 
-    return 1; 
-} 
- 
-/* 
- * AES128 CBC Implementation 
- */ 
- 
-static int dasync_aes128_cbc_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, 
-                                  void *ptr) 
-{ 
-    return dasync_cipher_ctrl_helper(ctx, type, arg, ptr, 0); 
-} 
- 
-static int dasync_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 
-                             const unsigned char *iv, int enc) 
-{ 
-    return dasync_cipher_init_key_helper(ctx, key, iv, enc, EVP_aes_128_cbc()); 
-} 
- 
-static int dasync_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 
-                               const unsigned char *in, size_t inl) 
-{ 
-    return dasync_cipher_helper(ctx, out, in, inl, EVP_aes_128_cbc()); 
-} 
- 
-static int dasync_aes128_cbc_cleanup(EVP_CIPHER_CTX *ctx) 
-{ 
-    return dasync_cipher_cleanup_helper(ctx, EVP_aes_128_cbc()); 
-} 
- 
- 
-/* 
- * AES128 CBC HMAC SHA1 Implementation 
- */ 
- 
-static int dasync_aes128_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, 
-                                             int arg, void *ptr) 
-{ 
-    return dasync_cipher_ctrl_helper(ctx, type, arg, ptr, 1); 
-} 
- 
-static int dasync_aes128_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx, 
-                                                const unsigned char *key, 
-                                                const unsigned char *iv, 
-                                                int enc) 
-{ 
-    /* 
-     * We can safely assume that EVP_aes_128_cbc_hmac_sha1() != NULL, 
-     * see comment before the definition of dasync_aes_128_cbc_hmac_sha1(). 
-     */ 
-    return dasync_cipher_init_key_helper(ctx, key, iv, enc, 
-                                         EVP_aes_128_cbc_hmac_sha1()); 
-} 
- 
-static int dasync_aes128_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx, 
-                                               unsigned char *out, 
-                                               const unsigned char *in, 
-                                               size_t inl) 
-{ 
-    return dasync_cipher_helper(ctx, out, in, inl, EVP_aes_128_cbc_hmac_sha1()); 
-} 
- 
-static int dasync_aes128_cbc_hmac_sha1_cleanup(EVP_CIPHER_CTX *ctx) 
-{ 
-    /* 
-     * We can safely assume that EVP_aes_128_cbc_hmac_sha1() != NULL, 
-     * see comment before the definition of dasync_aes_128_cbc_hmac_sha1(). 
-     */ 
-    return dasync_cipher_cleanup_helper(ctx, EVP_aes_128_cbc_hmac_sha1()); 
-} 
+/*
+ * Copyright 2015-2019 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#if defined(_WIN32)
+# include <windows.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+
+#include <openssl/engine.h>
+#include <openssl/sha.h>
+#include <openssl/aes.h>
+#include <openssl/rsa.h>
+#include <openssl/evp.h>
+#include <openssl/async.h>
+#include <openssl/bn.h>
+#include <openssl/crypto.h>
+#include <openssl/ssl.h>
+#include <openssl/modes.h>
+
+#if defined(OPENSSL_SYS_UNIX) && defined(OPENSSL_THREADS)
+# undef ASYNC_POSIX
+# define ASYNC_POSIX
+# include <unistd.h>
+#elif defined(_WIN32)
+# undef ASYNC_WIN
+# define ASYNC_WIN
+#endif
+
+#include "e_dasync_err.c"
+
+/* Engine Id and Name */
+static const char *engine_dasync_id = "dasync";
+static const char *engine_dasync_name = "Dummy Async engine support";
+
+
+/* Engine Lifetime functions */
+static int dasync_destroy(ENGINE *e);
+static int dasync_init(ENGINE *e);
+static int dasync_finish(ENGINE *e);
+void engine_load_dasync_int(void);
+
+
+/* Set up digests. Just SHA1 for now */
+static int dasync_digests(ENGINE *e, const EVP_MD **digest,
+                          const int **nids, int nid);
+
+static void dummy_pause_job(void);
+
+/* SHA1 */
+static int dasync_sha1_init(EVP_MD_CTX *ctx);
+static int dasync_sha1_update(EVP_MD_CTX *ctx, const void *data,
+                             size_t count);
+static int dasync_sha1_final(EVP_MD_CTX *ctx, unsigned char *md);
+
+/*
+ * Holds the EVP_MD object for sha1 in this engine. Set up once only during
+ * engine bind and can then be reused many times.
+ */
+static EVP_MD *_hidden_sha1_md = NULL;
+static const EVP_MD *dasync_sha1(void)
+{
+    return _hidden_sha1_md;
+}
+static void destroy_digests(void)
+{
+    EVP_MD_meth_free(_hidden_sha1_md);
+    _hidden_sha1_md = NULL;
+}
+
+static int dasync_digest_nids(const int **nids)
+{
+    static int digest_nids[2] = { 0, 0 };
+    static int pos = 0;
+    static int init = 0;
+
+    if (!init) {
+        const EVP_MD *md;
+        if ((md = dasync_sha1()) != NULL)
+            digest_nids[pos++] = EVP_MD_type(md);
+        digest_nids[pos] = 0;
+        init = 1;
+    }
+    *nids = digest_nids;
+    return pos;
+}
+
+/* RSA */
+
+static int dasync_pub_enc(int flen, const unsigned char *from,
+                    unsigned char *to, RSA *rsa, int padding);
+static int dasync_pub_dec(int flen, const unsigned char *from,
+                    unsigned char *to, RSA *rsa, int padding);
+static int dasync_rsa_priv_enc(int flen, const unsigned char *from,
+                      unsigned char *to, RSA *rsa, int padding);
+static int dasync_rsa_priv_dec(int flen, const unsigned char *from,
+                      unsigned char *to, RSA *rsa, int padding);
+static int dasync_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
+                              BN_CTX *ctx);
+
+static int dasync_rsa_init(RSA *rsa);
+static int dasync_rsa_finish(RSA *rsa);
+
+static RSA_METHOD *dasync_rsa_method = NULL;
+
+/* AES */
+
+static int dasync_aes128_cbc_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
+                                  void *ptr);
+static int dasync_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+                                  const unsigned char *iv, int enc);
+static int dasync_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+                                    const unsigned char *in, size_t inl);
+static int dasync_aes128_cbc_cleanup(EVP_CIPHER_CTX *ctx);
+
+static int dasync_aes128_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type,
+                                             int arg, void *ptr);
+static int dasync_aes128_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx,
+                                                 const unsigned char *key,
+                                                 const unsigned char *iv,
+                                                 int enc);
+static int dasync_aes128_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx,
+                                               unsigned char *out,
+                                               const unsigned char *in,
+                                               size_t inl);
+static int dasync_aes128_cbc_hmac_sha1_cleanup(EVP_CIPHER_CTX *ctx);
+
+struct dasync_pipeline_ctx {
+    void *inner_cipher_data;
+    unsigned int numpipes;
+    unsigned char **inbufs;
+    unsigned char **outbufs;
+    size_t *lens;
+    unsigned char tlsaad[SSL_MAX_PIPELINES][EVP_AEAD_TLS1_AAD_LEN];
+    unsigned int aadctr;
+};
+
+/*
+ * Holds the EVP_CIPHER object for aes_128_cbc in this engine. Set up once only
+ * during engine bind and can then be reused many times.
+ */
+static EVP_CIPHER *_hidden_aes_128_cbc = NULL;
+static const EVP_CIPHER *dasync_aes_128_cbc(void)
+{
+    return _hidden_aes_128_cbc;
+}
+
+/*
+ * Holds the EVP_CIPHER object for aes_128_cbc_hmac_sha1 in this engine. Set up
+ * once only during engine bind and can then be reused many times.
+ *
+ * This 'stitched' cipher depends on the EVP_aes_128_cbc_hmac_sha1() cipher,
+ * which is implemented only if the AES-NI instruction set extension is available
+ * (see OPENSSL_IA32CAP(3)). If that's not the case, then this cipher will not
+ * be available either.
+ *
+ * Note: Since it is a legacy mac-then-encrypt cipher, modern TLS peers (which
+ * negotiate the encrypt-then-mac extension) won't negotiate it anyway.
+ */
+static EVP_CIPHER *_hidden_aes_128_cbc_hmac_sha1 = NULL;
+static const EVP_CIPHER *dasync_aes_128_cbc_hmac_sha1(void)
+{
+    return _hidden_aes_128_cbc_hmac_sha1;
+}
+
+static void destroy_ciphers(void)
+{
+    EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
+    EVP_CIPHER_meth_free(_hidden_aes_128_cbc_hmac_sha1);
+    _hidden_aes_128_cbc = NULL;
+    _hidden_aes_128_cbc_hmac_sha1 = NULL;
+}
+
+static int dasync_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
+                                   const int **nids, int nid);
+
+static int dasync_cipher_nids[] = {
+    NID_aes_128_cbc,
+    NID_aes_128_cbc_hmac_sha1,
+    0
+};
+
+static int bind_dasync(ENGINE *e)
+{
+    /* Setup RSA_METHOD */
+    if ((dasync_rsa_method = RSA_meth_new("Dummy Async RSA method", 0)) == NULL
+        || RSA_meth_set_pub_enc(dasync_rsa_method, dasync_pub_enc) == 0
+        || RSA_meth_set_pub_dec(dasync_rsa_method, dasync_pub_dec) == 0
+        || RSA_meth_set_priv_enc(dasync_rsa_method, dasync_rsa_priv_enc) == 0
+        || RSA_meth_set_priv_dec(dasync_rsa_method, dasync_rsa_priv_dec) == 0
+        || RSA_meth_set_mod_exp(dasync_rsa_method, dasync_rsa_mod_exp) == 0
+        || RSA_meth_set_bn_mod_exp(dasync_rsa_method, BN_mod_exp_mont) == 0
+        || RSA_meth_set_init(dasync_rsa_method, dasync_rsa_init) == 0
+        || RSA_meth_set_finish(dasync_rsa_method, dasync_rsa_finish) == 0) {
+        DASYNCerr(DASYNC_F_BIND_DASYNC, DASYNC_R_INIT_FAILED);
+        return 0;
+    }
+
+    /* Ensure the dasync error handling is set up */
+    ERR_load_DASYNC_strings();
+
+    if (!ENGINE_set_id(e, engine_dasync_id)
+        || !ENGINE_set_name(e, engine_dasync_name)
+        || !ENGINE_set_RSA(e, dasync_rsa_method)
+        || !ENGINE_set_digests(e, dasync_digests)
+        || !ENGINE_set_ciphers(e, dasync_ciphers)
+        || !ENGINE_set_destroy_function(e, dasync_destroy)
+        || !ENGINE_set_init_function(e, dasync_init)
+        || !ENGINE_set_finish_function(e, dasync_finish)) {
+        DASYNCerr(DASYNC_F_BIND_DASYNC, DASYNC_R_INIT_FAILED);
+        return 0;
+    }
+
+    /*
+     * Set up the EVP_CIPHER and EVP_MD objects for the ciphers/digests
+     * supplied by this engine
+     */
+    _hidden_sha1_md = EVP_MD_meth_new(NID_sha1, NID_sha1WithRSAEncryption);
+    if (_hidden_sha1_md == NULL
+        || !EVP_MD_meth_set_result_size(_hidden_sha1_md, SHA_DIGEST_LENGTH)
+        || !EVP_MD_meth_set_input_blocksize(_hidden_sha1_md, SHA_CBLOCK)
+        || !EVP_MD_meth_set_app_datasize(_hidden_sha1_md,
+                                         sizeof(EVP_MD *) + sizeof(SHA_CTX))
+        || !EVP_MD_meth_set_flags(_hidden_sha1_md, EVP_MD_FLAG_DIGALGID_ABSENT)
+        || !EVP_MD_meth_set_init(_hidden_sha1_md, dasync_sha1_init)
+        || !EVP_MD_meth_set_update(_hidden_sha1_md, dasync_sha1_update)
+        || !EVP_MD_meth_set_final(_hidden_sha1_md, dasync_sha1_final)) {
+        EVP_MD_meth_free(_hidden_sha1_md);
+        _hidden_sha1_md = NULL;
+    }
+
+    _hidden_aes_128_cbc = EVP_CIPHER_meth_new(NID_aes_128_cbc,
+                                              16 /* block size */,
+                                              16 /* key len */);
+    if (_hidden_aes_128_cbc == NULL
+            || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc,16)
+            || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc,
+                                          EVP_CIPH_FLAG_DEFAULT_ASN1
+                                          | EVP_CIPH_CBC_MODE
+                                          | EVP_CIPH_FLAG_PIPELINE)
+            || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc,
+                                         dasync_aes128_init_key)
+            || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc,
+                                              dasync_aes128_cbc_cipher)
+            || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc,
+                                            dasync_aes128_cbc_cleanup)
+            || !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_cbc,
+                                         dasync_aes128_cbc_ctrl)
+            || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc,
+                                sizeof(struct dasync_pipeline_ctx))) {
+        EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
+        _hidden_aes_128_cbc = NULL;
+    }
+
+    _hidden_aes_128_cbc_hmac_sha1 = EVP_CIPHER_meth_new(
+                                                NID_aes_128_cbc_hmac_sha1,
+                                                16 /* block size */,
+                                                16 /* key len */);
+    if (_hidden_aes_128_cbc_hmac_sha1 == NULL
+            || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc_hmac_sha1,16)
+            || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc_hmac_sha1,
+                                            EVP_CIPH_CBC_MODE
+                                          | EVP_CIPH_FLAG_DEFAULT_ASN1
+                                          | EVP_CIPH_FLAG_AEAD_CIPHER
+                                          | EVP_CIPH_FLAG_PIPELINE)
+            || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc_hmac_sha1,
+                                         dasync_aes128_cbc_hmac_sha1_init_key)
+            || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc_hmac_sha1,
+                                            dasync_aes128_cbc_hmac_sha1_cipher)
+            || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc_hmac_sha1,
+                                            dasync_aes128_cbc_hmac_sha1_cleanup)
+            || !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_cbc_hmac_sha1,
+                                         dasync_aes128_cbc_hmac_sha1_ctrl)
+            || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc_hmac_sha1,
+                                sizeof(struct dasync_pipeline_ctx))) {
+        EVP_CIPHER_meth_free(_hidden_aes_128_cbc_hmac_sha1);
+        _hidden_aes_128_cbc_hmac_sha1 = NULL;
+    }
+
+    return 1;
+}
+
+# ifndef OPENSSL_NO_DYNAMIC_ENGINE
+static int bind_helper(ENGINE *e, const char *id)
+{
+    if (id && (strcmp(id, engine_dasync_id) != 0))
+        return 0;
+    if (!bind_dasync(e))
+        return 0;
+    return 1;
+}
+
+IMPLEMENT_DYNAMIC_CHECK_FN()
+    IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
+# endif
+
+static ENGINE *engine_dasync(void)
+{
+    ENGINE *ret = ENGINE_new();
+    if (!ret)
+        return NULL;
+    if (!bind_dasync(ret)) {
+        ENGINE_free(ret);
+        return NULL;
+    }
+    return ret;
+}
+
+void engine_load_dasync_int(void)
+{
+    ENGINE *toadd = engine_dasync();
+    if (!toadd)
+        return;
+    ENGINE_add(toadd);
+    ENGINE_free(toadd);
+    ERR_clear_error();
+}
+
+static int dasync_init(ENGINE *e)
+{
+    return 1;
+}
+
+
+static int dasync_finish(ENGINE *e)
+{
+    return 1;
+}
+
+
+static int dasync_destroy(ENGINE *e)
+{
+    destroy_digests();
+    destroy_ciphers();
+    RSA_meth_free(dasync_rsa_method);
+    ERR_unload_DASYNC_strings();
+    return 1;
+}
+
+static int dasync_digests(ENGINE *e, const EVP_MD **digest,
+                          const int **nids, int nid)
+{
+    int ok = 1;
+    if (!digest) {
+        /* We are returning a list of supported nids */
+        return dasync_digest_nids(nids);
+    }
+    /* We are being asked for a specific digest */
+    switch (nid) {
+    case NID_sha1:
+        *digest = dasync_sha1();
+        break;
+    default:
+        ok = 0;
+        *digest = NULL;
+        break;
+    }
+    return ok;
+}
+
+static int dasync_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
+                                   const int **nids, int nid)
+{
+    int ok = 1;
+    if (cipher == NULL) {
+        /* We are returning a list of supported nids */
+        *nids = dasync_cipher_nids;
+        return (sizeof(dasync_cipher_nids) -
+                1) / sizeof(dasync_cipher_nids[0]);
+    }
+    /* We are being asked for a specific cipher */
+    switch (nid) {
+    case NID_aes_128_cbc:
+        *cipher = dasync_aes_128_cbc();
+        break;
+    case NID_aes_128_cbc_hmac_sha1:
+        *cipher = dasync_aes_128_cbc_hmac_sha1();
+        break;
+    default:
+        ok = 0;
+        *cipher = NULL;
+        break;
+    }
+    return ok;
+}
+
+static void wait_cleanup(ASYNC_WAIT_CTX *ctx, const void *key,
+                         OSSL_ASYNC_FD readfd, void *pvwritefd)
+{
+    OSSL_ASYNC_FD *pwritefd = (OSSL_ASYNC_FD *)pvwritefd;
+#if defined(ASYNC_WIN)
+    CloseHandle(readfd);
+    CloseHandle(*pwritefd);
+#elif defined(ASYNC_POSIX)
+    close(readfd);
+    close(*pwritefd);
+#endif
+    OPENSSL_free(pwritefd);
+}
+
+#define DUMMY_CHAR 'X'
+
+static void dummy_pause_job(void) {
+    ASYNC_JOB *job;
+    ASYNC_WAIT_CTX *waitctx;
+    OSSL_ASYNC_FD pipefds[2] = {0, 0};
+    OSSL_ASYNC_FD *writefd;
+#if defined(ASYNC_WIN)
+    DWORD numwritten, numread;
+    char buf = DUMMY_CHAR;
+#elif defined(ASYNC_POSIX)
+    char buf = DUMMY_CHAR;
+#endif
+
+    if ((job = ASYNC_get_current_job()) == NULL)
+        return;
+
+    waitctx = ASYNC_get_wait_ctx(job);
+
+    if (ASYNC_WAIT_CTX_get_fd(waitctx, engine_dasync_id, &pipefds[0],
+                              (void **)&writefd)) {
+        pipefds[1] = *writefd;
+    } else {
+        writefd = OPENSSL_malloc(sizeof(*writefd));
+        if (writefd == NULL)
+            return;
+#if defined(ASYNC_WIN)
+        if (CreatePipe(&pipefds[0], &pipefds[1], NULL, 256) == 0) {
+            OPENSSL_free(writefd);
+            return;
+        }
+#elif defined(ASYNC_POSIX)
+        if (pipe(pipefds) != 0) {
+            OPENSSL_free(writefd);
+            return;
+        }
+#endif
+        *writefd = pipefds[1];
+
+        if (!ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_dasync_id, pipefds[0],
+                                        writefd, wait_cleanup)) {
+            wait_cleanup(waitctx, engine_dasync_id, pipefds[0], writefd);
+            return;
+        }
+    }
+    /*
+     * In the Dummy async engine we are cheating. We signal that the job
+     * is complete by waking it before the call to ASYNC_pause_job(). A real
+     * async engine would only wake when the job was actually complete
+     */
+#if defined(ASYNC_WIN)
+    WriteFile(pipefds[1], &buf, 1, &numwritten, NULL);
+#elif defined(ASYNC_POSIX)
+    if (write(pipefds[1], &buf, 1) < 0)
+        return;
+#endif
+
+    /* Ignore errors - we carry on anyway */
+    ASYNC_pause_job();
+
+    /* Clear the wake signal */
+#if defined(ASYNC_WIN)
+    ReadFile(pipefds[0], &buf, 1, &numread, NULL);
+#elif defined(ASYNC_POSIX)
+    if (read(pipefds[0], &buf, 1) < 0)
+        return;
+#endif
+}
+
+/*
+ * SHA1 implementation. At the moment we just defer to the standard
+ * implementation
+ */
+#undef data
+#define data(ctx) ((SHA_CTX *)EVP_MD_CTX_md_data(ctx))
+static int dasync_sha1_init(EVP_MD_CTX *ctx)
+{
+    dummy_pause_job();
+
+    return SHA1_Init(data(ctx));
+}
+
+static int dasync_sha1_update(EVP_MD_CTX *ctx, const void *data,
+                             size_t count)
+{
+    dummy_pause_job();
+
+    return SHA1_Update(data(ctx), data, (size_t)count);
+}
+
+static int dasync_sha1_final(EVP_MD_CTX *ctx, unsigned char *md)
+{
+    dummy_pause_job();
+
+    return SHA1_Final(md, data(ctx));
+}
+
+/*
+ * RSA implementation
+ */
+
+static int dasync_pub_enc(int flen, const unsigned char *from,
+                    unsigned char *to, RSA *rsa, int padding) {
+    /* Ignore errors - we carry on anyway */
+    dummy_pause_job();
+    return RSA_meth_get_pub_enc(RSA_PKCS1_OpenSSL())
+        (flen, from, to, rsa, padding);
+}
+
+static int dasync_pub_dec(int flen, const unsigned char *from,
+                    unsigned char *to, RSA *rsa, int padding) {
+    /* Ignore errors - we carry on anyway */
+    dummy_pause_job();
+    return RSA_meth_get_pub_dec(RSA_PKCS1_OpenSSL())
+        (flen, from, to, rsa, padding);
+}
+
+static int dasync_rsa_priv_enc(int flen, const unsigned char *from,
+                      unsigned char *to, RSA *rsa, int padding)
+{
+    /* Ignore errors - we carry on anyway */
+    dummy_pause_job();
+    return RSA_meth_get_priv_enc(RSA_PKCS1_OpenSSL())
+        (flen, from, to, rsa, padding);
+}
+
+static int dasync_rsa_priv_dec(int flen, const unsigned char *from,
+                      unsigned char *to, RSA *rsa, int padding)
+{
+    /* Ignore errors - we carry on anyway */
+    dummy_pause_job();
+    return RSA_meth_get_priv_dec(RSA_PKCS1_OpenSSL())
+        (flen, from, to, rsa, padding);
+}
+
+static int dasync_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
+{
+    /* Ignore errors - we carry on anyway */
+    dummy_pause_job();
+    return RSA_meth_get_mod_exp(RSA_PKCS1_OpenSSL())(r0, I, rsa, ctx);
+}
+
+static int dasync_rsa_init(RSA *rsa)
+{
+    return RSA_meth_get_init(RSA_PKCS1_OpenSSL())(rsa);
+}
+static int dasync_rsa_finish(RSA *rsa)
+{
+    return RSA_meth_get_finish(RSA_PKCS1_OpenSSL())(rsa);
+}
+
+/* Cipher helper functions */
+
+static int dasync_cipher_ctrl_helper(EVP_CIPHER_CTX *ctx, int type, int arg,
+                                     void *ptr, int aeadcapable)
+{
+    int ret;
+    struct dasync_pipeline_ctx *pipe_ctx =
+        (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+
+    if (pipe_ctx == NULL)
+        return 0;
+
+    switch (type) {
+        case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS:
+            pipe_ctx->numpipes = arg;
+            pipe_ctx->outbufs = (unsigned char **)ptr;
+            break;
+
+        case EVP_CTRL_SET_PIPELINE_INPUT_BUFS:
+            pipe_ctx->numpipes = arg;
+            pipe_ctx->inbufs = (unsigned char **)ptr;
+            break;
+
+        case EVP_CTRL_SET_PIPELINE_INPUT_LENS:
+            pipe_ctx->numpipes = arg;
+            pipe_ctx->lens = (size_t *)ptr;
+            break;
+
+        case EVP_CTRL_AEAD_SET_MAC_KEY:
+            if (!aeadcapable)
+                return -1;
+            EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
+            ret = EVP_CIPHER_meth_get_ctrl(EVP_aes_128_cbc_hmac_sha1())
+                                          (ctx, type, arg, ptr);
+            EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
+            return ret;
+
+        case EVP_CTRL_AEAD_TLS1_AAD:
+        {
+            unsigned char *p = ptr;
+            unsigned int len;
+
+            if (!aeadcapable || arg != EVP_AEAD_TLS1_AAD_LEN)
+                return -1;
+
+            if (pipe_ctx->aadctr >= SSL_MAX_PIPELINES)
+                return -1;
+
+            memcpy(pipe_ctx->tlsaad[pipe_ctx->aadctr], ptr,
+                   EVP_AEAD_TLS1_AAD_LEN);
+            pipe_ctx->aadctr++;
+
+            len = p[arg - 2] << 8 | p[arg - 1];
+
+            if (EVP_CIPHER_CTX_encrypting(ctx)) {
+                if ((p[arg - 4] << 8 | p[arg - 3]) >= TLS1_1_VERSION) {
+                    if (len < AES_BLOCK_SIZE)
+                        return 0;
+                    len -= AES_BLOCK_SIZE;
+                }
+
+                return ((len + SHA_DIGEST_LENGTH + AES_BLOCK_SIZE)
+                        & -AES_BLOCK_SIZE) - len;
+            } else {
+                return SHA_DIGEST_LENGTH;
+            }
+        }
+
+        default:
+            return 0;
+    }
+
+    return 1;
+}
+
+static int dasync_cipher_init_key_helper(EVP_CIPHER_CTX *ctx,
+                                         const unsigned char *key,
+                                         const unsigned char *iv, int enc,
+                                         const EVP_CIPHER *cipher)
+{
+    int ret;
+    struct dasync_pipeline_ctx *pipe_ctx =
+        (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+
+    if (pipe_ctx->inner_cipher_data == NULL
+            && EVP_CIPHER_impl_ctx_size(cipher) != 0) {
+        pipe_ctx->inner_cipher_data = OPENSSL_zalloc(
+            EVP_CIPHER_impl_ctx_size(cipher));
+        if (pipe_ctx->inner_cipher_data == NULL) {
+            DASYNCerr(DASYNC_F_DASYNC_CIPHER_INIT_KEY_HELPER,
+                        ERR_R_MALLOC_FAILURE);
+            return 0;
+        }
+    }
+
+    pipe_ctx->numpipes = 0;
+    pipe_ctx->aadctr = 0;
+
+    EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
+    ret = EVP_CIPHER_meth_get_init(cipher)(ctx, key, iv, enc);
+    EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
+
+    return ret;
+}
+
+static int dasync_cipher_helper(EVP_CIPHER_CTX *ctx, unsigned char *out,
+                                const unsigned char *in, size_t inl,
+                                const EVP_CIPHER *cipher)
+{
+    int ret = 1;
+    unsigned int i, pipes;
+    struct dasync_pipeline_ctx *pipe_ctx =
+        (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+
+    pipes = pipe_ctx->numpipes;
+    EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
+    if (pipes == 0) {
+        if (pipe_ctx->aadctr != 0) {
+            if (pipe_ctx->aadctr != 1)
+                return -1;
+            EVP_CIPHER_meth_get_ctrl(cipher)
+                                    (ctx, EVP_CTRL_AEAD_TLS1_AAD,
+                                     EVP_AEAD_TLS1_AAD_LEN,
+                                     pipe_ctx->tlsaad[0]);
+        }
+        ret = EVP_CIPHER_meth_get_do_cipher(cipher)
+                                           (ctx, out, in, inl);
+    } else {
+        if (pipe_ctx->aadctr > 0 && pipe_ctx->aadctr != pipes)
+            return -1;
+        for (i = 0; i < pipes; i++) {
+            if (pipe_ctx->aadctr > 0) {
+                EVP_CIPHER_meth_get_ctrl(cipher)
+                                        (ctx, EVP_CTRL_AEAD_TLS1_AAD,
+                                         EVP_AEAD_TLS1_AAD_LEN,
+                                         pipe_ctx->tlsaad[i]);
+            }
+            ret = ret && EVP_CIPHER_meth_get_do_cipher(cipher)
+                                (ctx, pipe_ctx->outbufs[i], pipe_ctx->inbufs[i],
+                                 pipe_ctx->lens[i]);
+        }
+        pipe_ctx->numpipes = 0;
+    }
+    pipe_ctx->aadctr = 0;
+    EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
+    return ret;
+}
+
+static int dasync_cipher_cleanup_helper(EVP_CIPHER_CTX *ctx,
+                                        const EVP_CIPHER *cipher)
+{
+    struct dasync_pipeline_ctx *pipe_ctx =
+        (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+
+    OPENSSL_clear_free(pipe_ctx->inner_cipher_data,
+                       EVP_CIPHER_impl_ctx_size(cipher));
+
+    return 1;
+}
+
+/*
+ * AES128 CBC Implementation
+ */
+
+static int dasync_aes128_cbc_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
+                                  void *ptr)
+{
+    return dasync_cipher_ctrl_helper(ctx, type, arg, ptr, 0);
+}
+
+static int dasync_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+                             const unsigned char *iv, int enc)
+{
+    return dasync_cipher_init_key_helper(ctx, key, iv, enc, EVP_aes_128_cbc());
+}
+
+static int dasync_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+                               const unsigned char *in, size_t inl)
+{
+    return dasync_cipher_helper(ctx, out, in, inl, EVP_aes_128_cbc());
+}
+
+static int dasync_aes128_cbc_cleanup(EVP_CIPHER_CTX *ctx)
+{
+    return dasync_cipher_cleanup_helper(ctx, EVP_aes_128_cbc());
+}
+
+
+/*
+ * AES128 CBC HMAC SHA1 Implementation
+ */
+
+static int dasync_aes128_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type,
+                                             int arg, void *ptr)
+{
+    return dasync_cipher_ctrl_helper(ctx, type, arg, ptr, 1);
+}
+
+static int dasync_aes128_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx,
+                                                const unsigned char *key,
+                                                const unsigned char *iv,
+                                                int enc)
+{
+    /*
+     * We can safely assume that EVP_aes_128_cbc_hmac_sha1() != NULL,
+     * see comment before the definition of dasync_aes_128_cbc_hmac_sha1().
+     */
+    return dasync_cipher_init_key_helper(ctx, key, iv, enc,
+                                         EVP_aes_128_cbc_hmac_sha1());
+}
+
+static int dasync_aes128_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx,
+                                               unsigned char *out,
+                                               const unsigned char *in,
+                                               size_t inl)
+{
+    return dasync_cipher_helper(ctx, out, in, inl, EVP_aes_128_cbc_hmac_sha1());
+}
+
+static int dasync_aes128_cbc_hmac_sha1_cleanup(EVP_CIPHER_CTX *ctx)
+{
+    /*
+     * We can safely assume that EVP_aes_128_cbc_hmac_sha1() != NULL,
+     * see comment before the definition of dasync_aes_128_cbc_hmac_sha1().
+     */
+    return dasync_cipher_cleanup_helper(ctx, EVP_aes_128_cbc_hmac_sha1());
+}