engines/e_dasync.c

   1 /*
   2  * Written by Matt Caswell (matt@openssl.org) for the OpenSSL project.
   3  */
   4 /* ====================================================================
   5  * Copyright (c) 2015 The OpenSSL Project.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  *
  19  * 3. All advertising materials mentioning features or use of this
  20  *    software must display the following acknowledgment:
  21  *    "This product includes software developed by the OpenSSL Project
  22  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  23  *
  24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  25  *    endorse or promote products derived from this software without
  26  *    prior written permission. For written permission, please contact
  27  *    licensing@OpenSSL.org.
  28  *
  29  * 5. Products derived from this software may not be called "OpenSSL"
  30  *    nor may "OpenSSL" appear in their names without prior written
  31  *    permission of the OpenSSL Project.
  32  *
  33  * 6. Redistributions of any form whatsoever must retain the following
  34  *    acknowledgment:
  35  *    "This product includes software developed by the OpenSSL Project
  36  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  49  * OF THE POSSIBILITY OF SUCH DAMAGE.
  50  * ====================================================================
  51  */
  52
  53 #include <stdio.h>
  54 #include <string.h>
  55
  56 #include <openssl/engine.h>
  57 #include <openssl/sha.h>
  58 #include <openssl/aes.h>
  59 #include <openssl/rsa.h>
  60 #include <openssl/evp.h>
  61 #include <openssl/async.h>
  62 #include <openssl/bn.h>
  63 #include <openssl/crypto.h>
  64 #include <openssl/ssl.h>
  65 #include <openssl/modes.h>
  66
  67 #if (defined(OPENSSL_SYS_UNIX) || defined(OPENSSL_SYS_CYGWIN)) && defined(OPENSSL_THREADS)
  68 # undef ASYNC_POSIX
  69 # define ASYNC_POSIX
  70 # include <unistd.h>
  71 #elif defined(_WIN32)
  72 # undef ASYNC_WIN
  73 # define ASYNC_WIN
  74 # include <windows.h>
  75 #endif
  76
  77 #define DASYNC_LIB_NAME "DASYNC"
  78 #include "e_dasync_err.c"
  79
  80 /* Engine Id and Name */
  81 static const char *engine_dasync_id = "dasync";
  82 static const char *engine_dasync_name = "Dummy Async engine support";
  83
  84
  85 /* Engine Lifetime functions */
  86 static int dasync_destroy(ENGINE *e);
  87 static int dasync_init(ENGINE *e);
  88 static int dasync_finish(ENGINE *e);
  89 void engine_load_dasync_internal(void);
  90
  91
  92 /* Set up digests. Just SHA1 for now */
  93 static int dasync_digests(ENGINE *e, const EVP_MD **digest,
  94                           const int **nids, int nid);
  95
  96 static void dummy_pause_job(void);
  97
  98 /* SHA1 */
  99 static int dasync_sha1_init(EVP_MD_CTX *ctx);
 100 static int dasync_sha1_update(EVP_MD_CTX *ctx, const void *data,
 101                              size_t count);
 102 static int dasync_sha1_final(EVP_MD_CTX *ctx, unsigned char *md);
 103
 104 /*
 105  * Holds the EVP_MD object for sha1 in this engine. Set up once only during
 106  * engine bind and can then be reused many times.
 107  */
 108 static EVP_MD *_hidden_sha1_md = NULL;
 109 static const EVP_MD *dasync_sha1(void)
 110 {
 111     return _hidden_sha1_md;
 112 }
 113 static void destroy_digests(void)
 114 {
 115     EVP_MD_meth_free(_hidden_sha1_md);
 116     _hidden_sha1_md = NULL;
 117 }
 118
 119 static int dasync_digest_nids(const int **nids)
 120 {
 121     static int digest_nids[2] = { 0, 0 };
 122     static int pos = 0;
 123     static int init = 0;
 124
 125     if (!init) {
 126         const EVP_MD *md;
 127         if ((md = dasync_sha1()) != NULL)
 128             digest_nids[pos++] = EVP_MD_type(md);
 129         digest_nids[pos] = 0;
 130         init = 1;
 131     }
 132     *nids = digest_nids;
 133     return pos;
 134 }
 135
 136 /* RSA */
 137
 138 static int dasync_pub_enc(int flen, const unsigned char *from,
 139                     unsigned char *to, RSA *rsa, int padding);
 140 static int dasync_pub_dec(int flen, const unsigned char *from,
 141                     unsigned char *to, RSA *rsa, int padding);
 142 static int dasync_rsa_priv_enc(int flen, const unsigned char *from,
 143                       unsigned char *to, RSA *rsa, int padding);
 144 static int dasync_rsa_priv_dec(int flen, const unsigned char *from,
 145                       unsigned char *to, RSA *rsa, int padding);
 146 static int dasync_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
 147                               BN_CTX *ctx);
 148
 149 static int dasync_rsa_init(RSA *rsa);
 150 static int dasync_rsa_finish(RSA *rsa);
 151
 152 static RSA_METHOD dasync_rsa_method = {
 153     "Dummy Async RSA method",
 154     dasync_pub_enc,             /* pub_enc */
 155     dasync_pub_dec,             /* pub_dec */
 156     dasync_rsa_priv_enc,        /* priv_enc */
 157     dasync_rsa_priv_dec,        /* priv_dec */
 158     dasync_rsa_mod_exp,         /* rsa_mod_exp */
 159     BN_mod_exp_mont,            /* bn_mod_exp */
 160     dasync_rsa_init,            /* init */
 161     dasync_rsa_finish,          /* finish */
 162     0,                          /* flags */
 163     NULL,                       /* app_data */
 164     0,                          /* rsa_sign */
 165     0,                          /* rsa_verify */
 166     NULL                        /* rsa_keygen */
 167 };
 168
 169
 170 /* AES */
 171
 172 static int dasync_aes128_cbc_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
 173                                   void *ptr);
 174 static int dasync_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 175                                   const unsigned char *iv, int enc);
 176 static int dasync_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 177                                     const unsigned char *in, size_t inl);
 178 static int dasync_aes128_cbc_cleanup(EVP_CIPHER_CTX *ctx);
 179
 180 static int dasync_aes128_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type,
 181                                              int arg, void *ptr);
 182 static int dasync_aes128_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx,
 183                                                  const unsigned char *key,
 184                                                  const unsigned char *iv,
 185                                                  int enc);
 186 static int dasync_aes128_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx,
 187                                                unsigned char *out,
 188                                                const unsigned char *in,
 189                                                size_t inl);
 190 static int dasync_aes128_cbc_hmac_sha1_cleanup(EVP_CIPHER_CTX *ctx);
 191
 192 struct dasync_pipeline_ctx {
 193     void *inner_cipher_data;
 194     unsigned int numpipes;
 195     unsigned char **inbufs;
 196     unsigned char **outbufs;
 197     size_t *lens;
 198     int enc;
 199     unsigned char tlsaad[SSL_MAX_PIPELINES][EVP_AEAD_TLS1_AAD_LEN];
 200     unsigned int aadctr;
 201 };
 202
 203 /*
 204  * Holds the EVP_CIPHER object for aes_128_cbc in this engine. Set up once only
 205  * during engine bind and can then be reused many times.
 206  */
 207 static EVP_CIPHER *_hidden_aes_128_cbc = NULL;
 208 static const EVP_CIPHER *dasync_aes_128_cbc(void)
 209 {
 210     return _hidden_aes_128_cbc;
 211 }
 212
 213 /*
 214  * Holds the EVP_CIPHER object for aes_128_cbc_hmac_sha1 in this engine. Set up
 215  * once only during engine bind and can then be reused many times.
 216  */
 217 static EVP_CIPHER *_hidden_aes_128_cbc_hmac_sha1 = NULL;
 218 static const EVP_CIPHER *dasync_aes_128_cbc_hmac_sha1(void)
 219 {
 220     return _hidden_aes_128_cbc_hmac_sha1;
 221 }
 222
 223 static void destroy_ciphers(void)
 224 {
 225     EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
 226     EVP_CIPHER_meth_free(_hidden_aes_128_cbc_hmac_sha1);
 227     _hidden_aes_128_cbc = NULL;
 228     _hidden_aes_128_cbc_hmac_sha1 = NULL;
 229 }
 230
 231 static int dasync_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 232                                    const int **nids, int nid);
 233
 234 static int dasync_cipher_nids[] = {
 235     NID_aes_128_cbc,
 236     NID_aes_128_cbc_hmac_sha1,
 237     0
 238 };
 239
 240 static int bind_dasync(ENGINE *e)
 241 {
 242     /* Ensure the dasync error handling is set up */
 243     ERR_load_DASYNC_strings();
 244
 245     if (!ENGINE_set_id(e, engine_dasync_id)
 246         || !ENGINE_set_name(e, engine_dasync_name)
 247         || !ENGINE_set_RSA(e, &dasync_rsa_method)
 248         || !ENGINE_set_digests(e, dasync_digests)
 249         || !ENGINE_set_ciphers(e, dasync_ciphers)
 250         || !ENGINE_set_destroy_function(e, dasync_destroy)
 251         || !ENGINE_set_init_function(e, dasync_init)
 252         || !ENGINE_set_finish_function(e, dasync_finish)) {
 253         DASYNCerr(DASYNC_F_BIND_DASYNC, DASYNC_R_INIT_FAILED);
 254         return 0;
 255     }
 256
 257     /*
 258      * Set up the EVP_CIPHER and EVP_MD objects for the ciphers/digests
 259      * supplied by this engine
 260      */
 261     _hidden_sha1_md = EVP_MD_meth_new(NID_sha1, NID_sha1WithRSAEncryption);
 262     if (_hidden_sha1_md == NULL
 263         || !EVP_MD_meth_set_result_size(_hidden_sha1_md, SHA_DIGEST_LENGTH)
 264         || !EVP_MD_meth_set_input_blocksize(_hidden_sha1_md, SHA_CBLOCK)
 265         || !EVP_MD_meth_set_app_datasize(_hidden_sha1_md,
 266                                          sizeof(EVP_MD *) + sizeof(SHA_CTX))
 267         || !EVP_MD_meth_set_flags(_hidden_sha1_md, EVP_MD_FLAG_DIGALGID_ABSENT)
 268         || !EVP_MD_meth_set_init(_hidden_sha1_md, dasync_sha1_init)
 269         || !EVP_MD_meth_set_update(_hidden_sha1_md, dasync_sha1_update)
 270         || !EVP_MD_meth_set_final(_hidden_sha1_md, dasync_sha1_final)) {
 271         EVP_MD_meth_free(_hidden_sha1_md);
 272         _hidden_sha1_md = NULL;
 273     }
 274
 275     _hidden_aes_128_cbc = EVP_CIPHER_meth_new(NID_aes_128_cbc,
 276                                               16 /* block size */,
 277                                               16 /* key len */);
 278     if (_hidden_aes_128_cbc == NULL
 279             || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc,16)
 280             || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc,
 281                                           EVP_CIPH_FLAG_DEFAULT_ASN1
 282                                           | EVP_CIPH_CBC_MODE
 283                                           | EVP_CIPH_FLAG_PIPELINE)
 284             || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc,
 285                                          dasync_aes128_init_key)
 286             || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc,
 287                                               dasync_aes128_cbc_cipher)
 288             || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc,
 289                                             dasync_aes128_cbc_cleanup)
 290             || !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_cbc,
 291                                          dasync_aes128_cbc_ctrl)
 292             || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc,
 293                                 sizeof(struct dasync_pipeline_ctx))) {
 294         EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
 295         _hidden_aes_128_cbc = NULL;
 296     }
 297
 298     _hidden_aes_128_cbc_hmac_sha1 = EVP_CIPHER_meth_new(
 299                                                 NID_aes_128_cbc_hmac_sha1,
 300                                                 16 /* block size */,
 301                                                 16 /* key len */);
 302     if (_hidden_aes_128_cbc_hmac_sha1 == NULL
 303             || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc_hmac_sha1,16)
 304             || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc_hmac_sha1,
 305                                             EVP_CIPH_CBC_MODE
 306                                           | EVP_CIPH_FLAG_DEFAULT_ASN1
 307                                           | EVP_CIPH_FLAG_AEAD_CIPHER
 308                                           | EVP_CIPH_FLAG_PIPELINE)
 309             || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc_hmac_sha1,
 310                                          dasync_aes128_cbc_hmac_sha1_init_key)
 311             || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc_hmac_sha1,
 312                                             dasync_aes128_cbc_hmac_sha1_cipher)
 313             || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc_hmac_sha1,
 314                                             dasync_aes128_cbc_hmac_sha1_cleanup)
 315             || !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_cbc_hmac_sha1,
 316                                          dasync_aes128_cbc_hmac_sha1_ctrl)
 317             || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc_hmac_sha1,
 318                                 sizeof(struct dasync_pipeline_ctx))) {
 319         EVP_CIPHER_meth_free(_hidden_aes_128_cbc_hmac_sha1);
 320         _hidden_aes_128_cbc_hmac_sha1 = NULL;
 321     }
 322
 323     return 1;
 324 }
 325
 326 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
 327 static int bind_helper(ENGINE *e, const char *id)
 328 {
 329     if (id && (strcmp(id, engine_dasync_id) != 0))
 330         return 0;
 331     if (!bind_dasync(e))
 332         return 0;
 333     return 1;
 334 }
 335
 336 IMPLEMENT_DYNAMIC_CHECK_FN()
 337     IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
 338 # endif
 339
 340 static ENGINE *engine_dasync(void)
 341 {
 342     ENGINE *ret = ENGINE_new();
 343     if (!ret)
 344         return NULL;
 345     if (!bind_dasync(ret)) {
 346         ENGINE_free(ret);
 347         return NULL;
 348     }
 349     return ret;
 350 }
 351
 352 void engine_load_dasync_internal(void)
 353 {
 354     ENGINE *toadd = engine_dasync();
 355     if (!toadd)
 356         return;
 357     ENGINE_add(toadd);
 358     ENGINE_free(toadd);
 359     ERR_clear_error();
 360 }
 361
 362 static int dasync_init(ENGINE *e)
 363 {
 364     return 1;
 365 }
 366
 367
 368 static int dasync_finish(ENGINE *e)
 369 {
 370     return 1;
 371 }
 372
 373
 374 static int dasync_destroy(ENGINE *e)
 375 {
 376     destroy_digests();
 377     destroy_ciphers();
 378     ERR_unload_DASYNC_strings();
 379     return 1;
 380 }
 381
 382 static int dasync_digests(ENGINE *e, const EVP_MD **digest,
 383                           const int **nids, int nid)
 384 {
 385     int ok = 1;
 386     if (!digest) {
 387         /* We are returning a list of supported nids */
 388         return dasync_digest_nids(nids);
 389     }
 390     /* We are being asked for a specific digest */
 391     switch (nid) {
 392     case NID_sha1:
 393         *digest = dasync_sha1();
 394         break;
 395     default:
 396         ok = 0;
 397         *digest = NULL;
 398         break;
 399     }
 400     return ok;
 401 }
 402
 403 static int dasync_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 404                                    const int **nids, int nid)
 405 {
 406     int ok = 1;
 407     if (cipher == NULL) {
 408         /* We are returning a list of supported nids */
 409         *nids = dasync_cipher_nids;
 410         return (sizeof(dasync_cipher_nids) -
 411                 1) / sizeof(dasync_cipher_nids[0]);
 412     }
 413     /* We are being asked for a specific cipher */
 414     switch (nid) {
 415     case NID_aes_128_cbc:
 416         *cipher = dasync_aes_128_cbc();
 417         break;
 418     case NID_aes_128_cbc_hmac_sha1:
 419         *cipher = dasync_aes_128_cbc_hmac_sha1();
 420         break;
 421     default:
 422         ok = 0;
 423         *cipher = NULL;
 424         break;
 425     }
 426     return ok;
 427 }
 428
 429 static void wait_cleanup(ASYNC_WAIT_CTX *ctx, const void *key,
 430                          OSSL_ASYNC_FD readfd, void *pvwritefd)
 431 {
 432     OSSL_ASYNC_FD *pwritefd = (OSSL_ASYNC_FD *)pvwritefd;
 433 #if defined(ASYNC_WIN)
 434     CloseHandle(readfd);
 435     CloseHandle(*pwritefd);
 436 #elif defined(ASYNC_POSIX)
 437     close(readfd);
 438     close(*pwritefd);
 439 #endif
 440     OPENSSL_free(pwritefd);
 441 }
 442
 443 #define DUMMY_CHAR 'X'
 444
 445 static void dummy_pause_job(void) {
 446     ASYNC_JOB *job;
 447     ASYNC_WAIT_CTX *waitctx;
 448     OSSL_ASYNC_FD pipefds[2] = {0, 0};
 449     OSSL_ASYNC_FD *writefd;
 450 #if defined(ASYNC_WIN)
 451     DWORD numwritten, numread;
 452     char buf = DUMMY_CHAR;
 453 #elif defined(ASYNC_POSIX)
 454     char buf = DUMMY_CHAR;
 455 #endif
 456
 457     if ((job = ASYNC_get_current_job()) == NULL)
 458         return;
 459
 460     waitctx = ASYNC_get_wait_ctx(job);
 461
 462     if (ASYNC_WAIT_CTX_get_fd(waitctx, engine_dasync_id, &pipefds[0],
 463                               (void **)&writefd)) {
 464         pipefds[1] = *writefd;
 465     } else {
 466         writefd = OPENSSL_malloc(sizeof(*writefd));
 467         if (writefd == NULL)
 468             return;
 469 #if defined(ASYNC_WIN)
 470         if (CreatePipe(&pipefds[0], &pipefds[1], NULL, 256) == 0) {
 471             OPENSSL_free(writefd);
 472             return;
 473         }
 474 #elif defined(ASYNC_POSIX)
 475         if (pipe(pipefds) != 0) {
 476             OPENSSL_free(writefd);
 477             return;
 478         }
 479 #endif
 480         *writefd = pipefds[1];
 481
 482         if(!ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_dasync_id, pipefds[0],
 483                                        writefd, wait_cleanup)) {
 484             wait_cleanup(waitctx, engine_dasync_id, pipefds[0], writefd);
 485             return;
 486         }
 487     }
 488     /*
 489      * In the Dummy async engine we are cheating. We signal that the job
 490      * is complete by waking it before the call to ASYNC_pause_job(). A real
 491      * async engine would only wake when the job was actually complete
 492      */
 493 #if defined(ASYNC_WIN)
 494     WriteFile(pipefds[1], &buf, 1, &numwritten, NULL);
 495 #elif defined(ASYNC_POSIX)
 496     if (write(pipefds[1], &buf, 1) < 0)
 497         return;
 498 #endif
 499
 500     /* Ignore errors - we carry on anyway */
 501     ASYNC_pause_job();
 502
 503     /* Clear the wake signal */
 504 #if defined(ASYNC_WIN)
 505     ReadFile(pipefds[0], &buf, 1, &numread, NULL);
 506 #elif defined(ASYNC_POSIX)
 507     if (read(pipefds[0], &buf, 1) < 0)
 508         return;
 509 #endif
 510 }
 511
 512 /*
 513  * SHA1 implementation. At the moment we just defer to the standard
 514  * implementation
 515  */
 516 #undef data
 517 #define data(ctx) ((SHA_CTX *)EVP_MD_CTX_md_data(ctx))
 518 static int dasync_sha1_init(EVP_MD_CTX *ctx)
 519 {
 520     dummy_pause_job();
 521
 522     return SHA1_Init(data(ctx));
 523 }
 524
 525 static int dasync_sha1_update(EVP_MD_CTX *ctx, const void *data,
 526                              size_t count)
 527 {
 528     dummy_pause_job();
 529
 530     return SHA1_Update(data(ctx), data, (size_t)count);
 531 }
 532
 533 static int dasync_sha1_final(EVP_MD_CTX *ctx, unsigned char *md)
 534 {
 535     dummy_pause_job();
 536
 537     return SHA1_Final(md, data(ctx));
 538 }
 539
 540 /*
 541  * RSA implementation
 542  */
 543
 544 static int dasync_pub_enc(int flen, const unsigned char *from,
 545                     unsigned char *to, RSA *rsa, int padding) {
 546     /* Ignore errors - we carry on anyway */
 547     dummy_pause_job();
 548     return RSA_PKCS1_OpenSSL()->rsa_pub_enc(flen, from, to, rsa, padding);
 549 }
 550
 551 static int dasync_pub_dec(int flen, const unsigned char *from,
 552                     unsigned char *to, RSA *rsa, int padding) {
 553     /* Ignore errors - we carry on anyway */
 554     dummy_pause_job();
 555     return RSA_PKCS1_OpenSSL()->rsa_pub_dec(flen, from, to, rsa, padding);
 556 }
 557
 558 static int dasync_rsa_priv_enc(int flen, const unsigned char *from,
 559                       unsigned char *to, RSA *rsa, int padding)
 560 {
 561     /* Ignore errors - we carry on anyway */
 562     dummy_pause_job();
 563     return RSA_PKCS1_OpenSSL()->rsa_priv_enc(flen, from, to, rsa, padding);
 564 }
 565
 566 static int dasync_rsa_priv_dec(int flen, const unsigned char *from,
 567                       unsigned char *to, RSA *rsa, int padding)
 568 {
 569     /* Ignore errors - we carry on anyway */
 570     dummy_pause_job();
 571     return RSA_PKCS1_OpenSSL()->rsa_priv_dec(flen, from, to, rsa, padding);
 572 }
 573
 574 static int dasync_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
 575 {
 576     /* Ignore errors - we carry on anyway */
 577     dummy_pause_job();
 578     return RSA_PKCS1_OpenSSL()->rsa_mod_exp(r0, I, rsa, ctx);
 579 }
 580
 581 static int dasync_rsa_init(RSA *rsa)
 582 {
 583     return RSA_PKCS1_OpenSSL()->init(rsa);
 584 }
 585 static int dasync_rsa_finish(RSA *rsa)
 586 {
 587     return RSA_PKCS1_OpenSSL()->finish(rsa);
 588 }
 589
 590 /* Cipher helper functions */
 591
 592 static int dasync_cipher_ctrl_helper(EVP_CIPHER_CTX *ctx, int type, int arg,
 593                                      void *ptr, int aeadcapable)
 594 {
 595     int ret;
 596     struct dasync_pipeline_ctx *pipe_ctx =
 597         (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
 598
 599     if (pipe_ctx == NULL)
 600         return 0;
 601
 602     switch (type) {
 603         case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS:
 604             pipe_ctx->numpipes = arg;
 605             pipe_ctx->outbufs = (unsigned char **)ptr;
 606             break;
 607
 608         case EVP_CTRL_SET_PIPELINE_INPUT_BUFS:
 609             pipe_ctx->numpipes = arg;
 610             pipe_ctx->inbufs = (unsigned char **)ptr;
 611             break;
 612
 613         case EVP_CTRL_SET_PIPELINE_INPUT_LENS:
 614             pipe_ctx->numpipes = arg;
 615             pipe_ctx->lens = (size_t *)ptr;
 616             break;
 617
 618         case EVP_CTRL_AEAD_SET_MAC_KEY:
 619             if (!aeadcapable)
 620                 return -1;
 621             EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
 622             ret = EVP_CIPHER_meth_get_ctrl(EVP_aes_128_cbc_hmac_sha1())
 623                                           (ctx, type, arg, ptr);
 624             EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
 625             return ret;
 626
 627         case EVP_CTRL_AEAD_TLS1_AAD:
 628         {
 629             unsigned char *p = ptr;
 630             unsigned int len;
 631
 632             if (!aeadcapable || arg != EVP_AEAD_TLS1_AAD_LEN)
 633                 return -1;
 634
 635             if (pipe_ctx->aadctr >= SSL_MAX_PIPELINES)
 636                 return -1;
 637
 638             memcpy(pipe_ctx->tlsaad[pipe_ctx->aadctr], ptr,
 639                    EVP_AEAD_TLS1_AAD_LEN);
 640             pipe_ctx->aadctr++;
 641
 642             len = p[arg - 2] << 8 | p[arg - 1];
 643
 644             if (pipe_ctx->enc) {
 645                 if ((p[arg - 4] << 8 | p[arg - 3]) >= TLS1_1_VERSION) {
 646                     len -= AES_BLOCK_SIZE;
 647                 }
 648
 649                 return ((len + SHA_DIGEST_LENGTH + AES_BLOCK_SIZE)
 650                         & -AES_BLOCK_SIZE) - len;
 651             } else {
 652                 return SHA_DIGEST_LENGTH;
 653             }
 654         }
 655
 656         default:
 657             return 0;
 658     }
 659
 660     return 1;
 661 }
 662
 663 static int dasync_cipher_init_key_helper(EVP_CIPHER_CTX *ctx,
 664                                          const unsigned char *key,
 665                                          const unsigned char *iv, int enc,
 666                                          const EVP_CIPHER *cipher)
 667 {
 668     int ret;
 669     struct dasync_pipeline_ctx *pipe_ctx =
 670         (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
 671
 672     if (pipe_ctx->inner_cipher_data == NULL
 673             && EVP_CIPHER_impl_ctx_size(cipher) != 0) {
 674         pipe_ctx->inner_cipher_data = OPENSSL_zalloc(
 675             EVP_CIPHER_impl_ctx_size(cipher));
 676         if (pipe_ctx->inner_cipher_data == NULL) {
 677             DASYNCerr(DASYNC_F_DASYNC_CIPHER_INIT_KEY_HELPER,
 678                         ERR_R_MALLOC_FAILURE);
 679             return 0;
 680         }
 681     }
 682
 683     pipe_ctx->numpipes = 0;
 684     pipe_ctx->aadctr = 0;
 685
 686     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
 687     ret = EVP_CIPHER_meth_get_init(cipher)(ctx, key, iv, enc);
 688     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
 689
 690     return ret;
 691 }
 692
 693 static int dasync_cipher_helper(EVP_CIPHER_CTX *ctx, unsigned char *out,
 694                                 const unsigned char *in, size_t inl,
 695                                 const EVP_CIPHER *cipher)
 696 {
 697     int ret = 1;
 698     unsigned int i, pipes;
 699     struct dasync_pipeline_ctx *pipe_ctx =
 700         (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
 701
 702     pipes = pipe_ctx->numpipes;
 703     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
 704     if (pipes == 0) {
 705         if (pipe_ctx->aadctr != 0) {
 706             if (pipe_ctx->aadctr != 1)
 707                 return -1;
 708             EVP_CIPHER_meth_get_ctrl(cipher)
 709                                     (ctx, EVP_CTRL_AEAD_TLS1_AAD,
 710                                      EVP_AEAD_TLS1_AAD_LEN,
 711                                      pipe_ctx->tlsaad[0]);
 712         }
 713         ret = EVP_CIPHER_meth_get_do_cipher(cipher)
 714                                            (ctx, out, in, inl);
 715     } else {
 716         if (pipe_ctx->aadctr > 0 && pipe_ctx->aadctr != pipes)
 717             return -1;
 718         for (i = 0; i < pipes; i++) {
 719             if (pipe_ctx->aadctr > 0) {
 720                 EVP_CIPHER_meth_get_ctrl(cipher)
 721                                         (ctx, EVP_CTRL_AEAD_TLS1_AAD,
 722                                          EVP_AEAD_TLS1_AAD_LEN,
 723                                          pipe_ctx->tlsaad[i]);
 724             }
 725             ret = ret && EVP_CIPHER_meth_get_do_cipher(cipher)
 726                                 (ctx, pipe_ctx->outbufs[i], pipe_ctx->inbufs[i],
 727                                  pipe_ctx->lens[i]);
 728         }
 729         pipe_ctx->numpipes = 0;
 730     }
 731     pipe_ctx->aadctr = 0;
 732     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
 733     return ret;
 734 }
 735
 736 static int dasync_cipher_cleanup_helper(EVP_CIPHER_CTX *ctx,
 737                                         const EVP_CIPHER *cipher)
 738 {
 739     struct dasync_pipeline_ctx *pipe_ctx =
 740         (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
 741
 742     OPENSSL_clear_free(pipe_ctx->inner_cipher_data,
 743                        EVP_CIPHER_impl_ctx_size(cipher));
 744
 745     return 1;
 746 }
 747
 748 /*
 749  * AES128 CBC Implementation
 750  */
 751
 752 static int dasync_aes128_cbc_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
 753                                   void *ptr)
 754 {
 755     return dasync_cipher_ctrl_helper(ctx, type, arg, ptr, 0);
 756 }
 757
 758 static int dasync_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 759                              const unsigned char *iv, int enc)
 760 {
 761     return dasync_cipher_init_key_helper(ctx, key, iv, enc, EVP_aes_128_cbc());
 762 }
 763
 764 static int dasync_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 765                                const unsigned char *in, size_t inl)
 766 {
 767     return dasync_cipher_helper(ctx, out, in, inl, EVP_aes_128_cbc());
 768 }
 769
 770 static int dasync_aes128_cbc_cleanup(EVP_CIPHER_CTX *ctx)
 771 {
 772     return dasync_cipher_cleanup_helper(ctx, EVP_aes_128_cbc());
 773 }
 774
 775
 776 /*
 777  * AES128 CBC HMAC SHA1 Implementation
 778  */
 779
 780 static int dasync_aes128_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type,
 781                                              int arg, void *ptr)
 782 {
 783     return dasync_cipher_ctrl_helper(ctx, type, arg, ptr, 1);
 784 }
 785
 786 static int dasync_aes128_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx,
 787                                                 const unsigned char *key,
 788                                                 const unsigned char *iv,
 789                                                 int enc)
 790 {
 791     return dasync_cipher_init_key_helper(ctx, key, iv, enc,
 792                                          EVP_aes_128_cbc_hmac_sha1());
 793 }
 794
 795 static int dasync_aes128_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx,
 796                                                unsigned char *out,
 797                                                const unsigned char *in,
 798                                                size_t inl)
 799 {
 800     return dasync_cipher_helper(ctx, out, in, inl, EVP_aes_128_cbc_hmac_sha1());
 801 }
 802
 803 static int dasync_aes128_cbc_hmac_sha1_cleanup(EVP_CIPHER_CTX *ctx)
 804 {
 805     return dasync_cipher_cleanup_helper(ctx, EVP_aes_128_cbc_hmac_sha1());
 806 }