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/rsa.h>
  59 #include <openssl/evp.h>
  60 #include <openssl/async.h>
  61 #include <openssl/bn.h>
  62 #include <openssl/crypto.h>
  63 #include <openssl/ssl.h>
  64 #include <openssl/modes.h>
  65
  66 #if (defined(OPENSSL_SYS_UNIX) || defined(OPENSSL_SYS_CYGWIN)) && defined(OPENSSL_THREADS)
  67 # undef ASYNC_POSIX
  68 # define ASYNC_POSIX
  69 # include <unistd.h>
  70 #elif defined(_WIN32)
  71 # undef ASYNC_WIN
  72 # define ASYNC_WIN
  73 # include <windows.h>
  74 #endif
  75
  76 #define DASYNC_LIB_NAME "DASYNC"
  77 #include "e_dasync_err.c"
  78
  79 /* Engine Id and Name */
  80 static const char *engine_dasync_id = "dasync";
  81 static const char *engine_dasync_name = "Dummy Async engine support";
  82
  83
  84 /* Engine Lifetime functions */
  85 static int dasync_destroy(ENGINE *e);
  86 static int dasync_init(ENGINE *e);
  87 static int dasync_finish(ENGINE *e);
  88 void engine_load_dasync_internal(void);
  89
  90
  91 /* Set up digests. Just SHA1 for now */
  92 static int dasync_digests(ENGINE *e, const EVP_MD **digest,
  93                           const int **nids, int nid);
  94
  95 static void dummy_pause_job(void);
  96
  97 /* SHA1 */
  98 static int dasync_sha1_init(EVP_MD_CTX *ctx);
  99 static int dasync_sha1_update(EVP_MD_CTX *ctx, const void *data,
 100                              size_t count);
 101 static int dasync_sha1_final(EVP_MD_CTX *ctx, unsigned char *md);
 102
 103 static EVP_MD *_hidden_sha1_md = NULL;
 104 static const EVP_MD *dasync_sha1(void)
 105 {
 106     if (_hidden_sha1_md == NULL) {
 107         EVP_MD *md;
 108
 109         if ((md = EVP_MD_meth_new(NID_sha1, NID_sha1WithRSAEncryption)) == NULL
 110             || !EVP_MD_meth_set_result_size(md, SHA_DIGEST_LENGTH)
 111             || !EVP_MD_meth_set_input_blocksize(md, SHA_CBLOCK)
 112             || !EVP_MD_meth_set_app_datasize(md,
 113                                              sizeof(EVP_MD *) + sizeof(SHA_CTX))
 114             || !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
 115             || !EVP_MD_meth_set_init(md, dasync_sha1_init)
 116             || !EVP_MD_meth_set_update(md, dasync_sha1_update)
 117             || !EVP_MD_meth_set_final(md, dasync_sha1_final)) {
 118             EVP_MD_meth_free(md);
 119             md = NULL;
 120         }
 121         _hidden_sha1_md = md;
 122     }
 123     return _hidden_sha1_md;
 124 }
 125 static void destroy_digests(void)
 126 {
 127     EVP_MD_meth_free(_hidden_sha1_md);
 128     _hidden_sha1_md = NULL;
 129 }
 130 static int dasync_digest_nids(const int **nids)
 131 {
 132     static int digest_nids[2] = { 0, 0 };
 133     static int pos = 0;
 134     static int init = 0;
 135
 136     if (!init) {
 137         const EVP_MD *md;
 138         if ((md = dasync_sha1()) != NULL)
 139             digest_nids[pos++] = EVP_MD_type(md);
 140         digest_nids[pos] = 0;
 141         init = 1;
 142     }
 143     *nids = digest_nids;
 144     return pos;
 145 }
 146
 147 /* RSA */
 148
 149 static int dasync_pub_enc(int flen, const unsigned char *from,
 150                     unsigned char *to, RSA *rsa, int padding);
 151 static int dasync_pub_dec(int flen, const unsigned char *from,
 152                     unsigned char *to, RSA *rsa, int padding);
 153 static int dasync_rsa_priv_enc(int flen, const unsigned char *from,
 154                       unsigned char *to, RSA *rsa, int padding);
 155 static int dasync_rsa_priv_dec(int flen, const unsigned char *from,
 156                       unsigned char *to, RSA *rsa, int padding);
 157 static int dasync_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
 158                               BN_CTX *ctx);
 159
 160 static int dasync_rsa_init(RSA *rsa);
 161 static int dasync_rsa_finish(RSA *rsa);
 162
 163 static RSA_METHOD dasync_rsa_method = {
 164     "Dummy Async RSA method",
 165     dasync_pub_enc,             /* pub_enc */
 166     dasync_pub_dec,             /* pub_dec */
 167     dasync_rsa_priv_enc,        /* priv_enc */
 168     dasync_rsa_priv_dec,        /* priv_dec */
 169     dasync_rsa_mod_exp,         /* rsa_mod_exp */
 170     BN_mod_exp_mont,            /* bn_mod_exp */
 171     dasync_rsa_init,            /* init */
 172     dasync_rsa_finish,          /* finish */
 173     0,                          /* flags */
 174     NULL,                       /* app_data */
 175     0,                          /* rsa_sign */
 176     0,                          /* rsa_verify */
 177     NULL                        /* rsa_keygen */
 178 };
 179
 180
 181 /* AES */
 182
 183 static int dasync_aes128_cbc_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
 184                                   void *ptr);
 185
 186 static int dasync_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 187                                   const unsigned char *iv, int enc);
 188
 189 static int dasync_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 190                                     const unsigned char *in, size_t inl);
 191
 192 static int dasync_aes128_cbc_cleanup(EVP_CIPHER_CTX *ctx);
 193
 194 struct aes_128_cbc_pipeline_ctx {
 195     void *inner_cipher_data;
 196     unsigned char dummy[256];
 197     unsigned int numpipes;
 198     unsigned char **inbufs;
 199     unsigned char **outbufs;
 200     size_t *lens;
 201 };
 202
 203 static EVP_CIPHER *_hidden_aes_128_cbc = NULL;
 204 static const EVP_CIPHER *dasync_aes_128_cbc(void)
 205 {
 206     if (_hidden_aes_128_cbc == NULL)
 207         _hidden_aes_128_cbc = EVP_CIPHER_meth_new(NID_aes_128_cbc,
 208                                                   16 /* block size */,
 209                                                   16 /* key len */);
 210     if (_hidden_aes_128_cbc == NULL
 211             || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc,16)
 212             || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc,
 213                                           EVP_CIPH_FLAG_DEFAULT_ASN1
 214                                           | EVP_CIPH_CBC_MODE
 215                                           | EVP_CIPH_FLAG_PIPELINE)
 216             || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc,
 217                                          dasync_aes128_init_key)
 218             || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc,
 219                                               dasync_aes128_cbc_cipher)
 220             || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc,
 221                                             dasync_aes128_cbc_cleanup)
 222             || !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_cbc,
 223                                          dasync_aes128_cbc_ctrl)
 224             || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc,
 225                                 sizeof(struct aes_128_cbc_pipeline_ctx))) {
 226         EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
 227         _hidden_aes_128_cbc = NULL;
 228     }
 229     return _hidden_aes_128_cbc;
 230 }
 231
 232
 233 static int dasync_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 234                                    const int **nids, int nid);
 235
 236 #  ifdef NID_aes_128_cbc_hmac_sha256
 237 static int dasync_cipher_nids[] = {
 238     NID_aes_128_cbc,
 239     0
 240 };
 241 #  else
 242 static int dasync_cipher_nids[] = { 0 };
 243 #endif
 244
 245 static int bind_dasync(ENGINE *e)
 246 {
 247     /* Ensure the dasync error handling is set up */
 248     ERR_load_DASYNC_strings();
 249
 250     if (!ENGINE_set_id(e, engine_dasync_id)
 251         || !ENGINE_set_name(e, engine_dasync_name)
 252         || !ENGINE_set_RSA(e, &dasync_rsa_method)
 253         || !ENGINE_set_digests(e, dasync_digests)
 254         || !ENGINE_set_ciphers(e, dasync_ciphers)
 255         || !ENGINE_set_destroy_function(e, dasync_destroy)
 256         || !ENGINE_set_init_function(e, dasync_init)
 257         || !ENGINE_set_finish_function(e, dasync_finish)) {
 258         DASYNCerr(DASYNC_F_BIND_DASYNC, DASYNC_R_INIT_FAILED);
 259         return 0;
 260     }
 261
 262     return 1;
 263 }
 264
 265 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
 266 static int bind_helper(ENGINE *e, const char *id)
 267 {
 268     if (id && (strcmp(id, engine_dasync_id) != 0))
 269         return 0;
 270     if (!bind_dasync(e))
 271         return 0;
 272     return 1;
 273 }
 274
 275 IMPLEMENT_DYNAMIC_CHECK_FN()
 276     IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
 277 # endif
 278
 279 static ENGINE *engine_dasync(void)
 280 {
 281     ENGINE *ret = ENGINE_new();
 282     if (!ret)
 283         return NULL;
 284     if (!bind_dasync(ret)) {
 285         ENGINE_free(ret);
 286         return NULL;
 287     }
 288     return ret;
 289 }
 290
 291 void engine_load_dasync_internal(void)
 292 {
 293     ENGINE *toadd = engine_dasync();
 294     if (!toadd)
 295         return;
 296     ENGINE_add(toadd);
 297     ENGINE_free(toadd);
 298     ERR_clear_error();
 299 }
 300
 301 static int dasync_init(ENGINE *e)
 302 {
 303     return 1;
 304 }
 305
 306
 307 static int dasync_finish(ENGINE *e)
 308 {
 309     return 1;
 310 }
 311
 312
 313 static int dasync_destroy(ENGINE *e)
 314 {
 315     destroy_digests();
 316     ERR_unload_DASYNC_strings();
 317     return 1;
 318 }
 319
 320 static int dasync_digests(ENGINE *e, const EVP_MD **digest,
 321                           const int **nids, int nid)
 322 {
 323     int ok = 1;
 324     if (!digest) {
 325         /* We are returning a list of supported nids */
 326         return dasync_digest_nids(nids);
 327     }
 328     /* We are being asked for a specific digest */
 329     switch (nid) {
 330     case NID_sha1:
 331         *digest = dasync_sha1();
 332         break;
 333     default:
 334         ok = 0;
 335         *digest = NULL;
 336         break;
 337     }
 338     return ok;
 339 }
 340
 341 static int dasync_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 342                                    const int **nids, int nid)
 343 {
 344     int ok = 1;
 345     if (!cipher) {
 346         /* We are returning a list of supported nids */
 347         *nids = dasync_cipher_nids;
 348         return (sizeof(dasync_cipher_nids) -
 349                 1) / sizeof(dasync_cipher_nids[0]);
 350     }
 351     /* We are being asked for a specific cipher */
 352     switch (nid) {
 353     case NID_aes_128_cbc:
 354         *cipher = dasync_aes_128_cbc();
 355         break;
 356     default:
 357         ok = 0;
 358         *cipher = NULL;
 359         break;
 360     }
 361     return ok;
 362 }
 363
 364 static void wait_cleanup(ASYNC_WAIT_CTX *ctx, const void *key,
 365                          OSSL_ASYNC_FD readfd, void *pvwritefd)
 366 {
 367     OSSL_ASYNC_FD *pwritefd = (OSSL_ASYNC_FD *)pvwritefd;
 368 #if defined(ASYNC_WIN)
 369     CloseHandle(readfd);
 370     CloseHandle(*pwritefd);
 371 #elif defined(ASYNC_POSIX)
 372     close(readfd);
 373     close(*pwritefd);
 374 #endif
 375     OPENSSL_free(pwritefd);
 376 }
 377
 378 #define DUMMY_CHAR 'X'
 379
 380 static void dummy_pause_job(void) {
 381     ASYNC_JOB *job;
 382     ASYNC_WAIT_CTX *waitctx;
 383     OSSL_ASYNC_FD pipefds[2] = {0, 0};
 384     OSSL_ASYNC_FD *writefd;
 385 #if defined(ASYNC_WIN)
 386     DWORD numwritten, numread;
 387     char buf = DUMMY_CHAR;
 388 #elif defined(ASYNC_POSIX)
 389     char buf = DUMMY_CHAR;
 390 #endif
 391
 392     if ((job = ASYNC_get_current_job()) == NULL)
 393         return;
 394
 395     waitctx = ASYNC_get_wait_ctx(job);
 396
 397     if (ASYNC_WAIT_CTX_get_fd(waitctx, engine_dasync_id, &pipefds[0],
 398                               (void **)&writefd)) {
 399         pipefds[1] = *writefd;
 400     } else {
 401         writefd = OPENSSL_malloc(sizeof(*writefd));
 402         if (writefd == NULL)
 403             return;
 404 #if defined(ASYNC_WIN)
 405         if (CreatePipe(&pipefds[0], &pipefds[1], NULL, 256) == 0) {
 406             OPENSSL_free(writefd);
 407             return;
 408         }
 409 #elif defined(ASYNC_POSIX)
 410         if (pipe(pipefds) != 0) {
 411             OPENSSL_free(writefd);
 412             return;
 413         }
 414 #endif
 415         *writefd = pipefds[1];
 416
 417         if(!ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_dasync_id, pipefds[0],
 418                                        writefd, wait_cleanup)) {
 419             wait_cleanup(waitctx, engine_dasync_id, pipefds[0], writefd);
 420             return;
 421         }
 422     }
 423     /*
 424      * In the Dummy async engine we are cheating. We signal that the job
 425      * is complete by waking it before the call to ASYNC_pause_job(). A real
 426      * async engine would only wake when the job was actually complete
 427      */
 428 #if defined(ASYNC_WIN)
 429     WriteFile(pipefds[1], &buf, 1, &numwritten, NULL);
 430 #elif defined(ASYNC_POSIX)
 431     if (write(pipefds[1], &buf, 1) < 0)
 432         return;
 433 #endif
 434
 435     /* Ignore errors - we carry on anyway */
 436     ASYNC_pause_job();
 437
 438     /* Clear the wake signal */
 439 #if defined(ASYNC_WIN)
 440     ReadFile(pipefds[0], &buf, 1, &numread, NULL);
 441 #elif defined(ASYNC_POSIX)
 442     if (read(pipefds[0], &buf, 1) < 0)
 443         return;
 444 #endif
 445 }
 446
 447 /*
 448  * SHA1 implementation. At the moment we just defer to the standard
 449  * implementation
 450  */
 451 #undef data
 452 #define data(ctx) ((SHA_CTX *)EVP_MD_CTX_md_data(ctx))
 453 static int dasync_sha1_init(EVP_MD_CTX *ctx)
 454 {
 455     dummy_pause_job();
 456
 457     return SHA1_Init(data(ctx));
 458 }
 459
 460 static int dasync_sha1_update(EVP_MD_CTX *ctx, const void *data,
 461                              size_t count)
 462 {
 463     dummy_pause_job();
 464
 465     return SHA1_Update(data(ctx), data, (size_t)count);
 466 }
 467
 468 static int dasync_sha1_final(EVP_MD_CTX *ctx, unsigned char *md)
 469 {
 470     dummy_pause_job();
 471
 472     return SHA1_Final(md, data(ctx));
 473 }
 474
 475 /*
 476  * RSA implementation
 477  */
 478
 479 static int dasync_pub_enc(int flen, const unsigned char *from,
 480                     unsigned char *to, RSA *rsa, int padding) {
 481     /* Ignore errors - we carry on anyway */
 482     dummy_pause_job();
 483     return RSA_PKCS1_OpenSSL()->rsa_pub_enc(flen, from, to, rsa, padding);
 484 }
 485
 486 static int dasync_pub_dec(int flen, const unsigned char *from,
 487                     unsigned char *to, RSA *rsa, int padding) {
 488     /* Ignore errors - we carry on anyway */
 489     dummy_pause_job();
 490     return RSA_PKCS1_OpenSSL()->rsa_pub_dec(flen, from, to, rsa, padding);
 491 }
 492
 493 static int dasync_rsa_priv_enc(int flen, const unsigned char *from,
 494                       unsigned char *to, RSA *rsa, int padding)
 495 {
 496     /* Ignore errors - we carry on anyway */
 497     dummy_pause_job();
 498     return RSA_PKCS1_OpenSSL()->rsa_priv_enc(flen, from, to, rsa, padding);
 499 }
 500
 501 static int dasync_rsa_priv_dec(int flen, const unsigned char *from,
 502                       unsigned char *to, RSA *rsa, int padding)
 503 {
 504     /* Ignore errors - we carry on anyway */
 505     dummy_pause_job();
 506     return RSA_PKCS1_OpenSSL()->rsa_priv_dec(flen, from, to, rsa, padding);
 507 }
 508
 509 static int dasync_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
 510 {
 511     /* Ignore errors - we carry on anyway */
 512     dummy_pause_job();
 513     return RSA_PKCS1_OpenSSL()->rsa_mod_exp(r0, I, rsa, ctx);
 514 }
 515
 516 static int dasync_rsa_init(RSA *rsa)
 517 {
 518     return RSA_PKCS1_OpenSSL()->init(rsa);
 519 }
 520 static int dasync_rsa_finish(RSA *rsa)
 521 {
 522     return RSA_PKCS1_OpenSSL()->finish(rsa);
 523 }
 524
 525 /*
 526  * AES128 Implementation
 527  */
 528
 529 static int dasync_aes128_cbc_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
 530                                   void *ptr)
 531 {
 532     struct aes_128_cbc_pipeline_ctx *pipe_ctx =
 533         (struct aes_128_cbc_pipeline_ctx *)EVP_CIPHER_CTX_cipher_data(ctx);
 534
 535     if (pipe_ctx == NULL)
 536         return 0;
 537
 538     switch (type) {
 539         case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS:
 540             pipe_ctx->numpipes = arg;
 541             pipe_ctx->outbufs = (unsigned char **)ptr;
 542             break;
 543
 544         case EVP_CTRL_SET_PIPELINE_INPUT_BUFS:
 545             pipe_ctx->numpipes = arg;
 546             pipe_ctx->inbufs = (unsigned char **)ptr;
 547             break;
 548
 549         case EVP_CTRL_SET_PIPELINE_INPUT_LENS:
 550             pipe_ctx->numpipes = arg;
 551             pipe_ctx->lens = (size_t *)ptr;
 552             break;
 553
 554         default:
 555             return 0;
 556     }
 557
 558     return 1;
 559 }
 560
 561 static int dasync_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 562                              const unsigned char *iv, int enc)
 563 {
 564     int ret;
 565     struct aes_128_cbc_pipeline_ctx *pipe_ctx =
 566         (struct aes_128_cbc_pipeline_ctx *)EVP_CIPHER_CTX_cipher_data(ctx);
 567
 568     if (pipe_ctx->inner_cipher_data == NULL
 569             && EVP_CIPHER_impl_ctx_size(EVP_aes_128_cbc()) != 0) {
 570         pipe_ctx->inner_cipher_data = OPENSSL_zalloc(
 571             EVP_CIPHER_impl_ctx_size(EVP_aes_128_cbc()));
 572         if (pipe_ctx->inner_cipher_data == NULL) {
 573             DASYNCerr(DASYNC_F_DASYNC_AES128_INIT_KEY,
 574                         ERR_R_MALLOC_FAILURE);
 575             return 0;
 576         }
 577     }
 578
 579     pipe_ctx->numpipes = 0;
 580
 581     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
 582     ret = EVP_CIPHER_meth_get_init(EVP_aes_128_cbc())(ctx, key, iv, enc);
 583     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
 584
 585     return ret;
 586 }
 587
 588 static int dasync_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 589                                const unsigned char *in, size_t inl)
 590 {
 591     int ret = 1;
 592     unsigned int i, pipes;
 593     struct aes_128_cbc_pipeline_ctx *pipe_ctx =
 594         (struct aes_128_cbc_pipeline_ctx *)EVP_CIPHER_CTX_cipher_data(ctx);
 595
 596     pipes = pipe_ctx->numpipes;
 597     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
 598     if (pipes == 0) {
 599         ret = EVP_CIPHER_meth_get_do_cipher(EVP_aes_128_cbc())
 600                                            (ctx, out, in, inl);
 601     } else {
 602         for (i = 0; i < pipes; i++) {
 603             ret = ret && EVP_CIPHER_meth_get_do_cipher(EVP_aes_128_cbc())
 604                                    (ctx, pipe_ctx->outbufs[i],
 605                                     pipe_ctx->inbufs[i],
 606                                     pipe_ctx->lens[i]);
 607         }
 608         pipe_ctx->numpipes = 0;
 609     }
 610     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
 611     return ret;
 612 }
 613
 614 static int dasync_aes128_cbc_cleanup(EVP_CIPHER_CTX *ctx)
 615 {
 616     struct aes_128_cbc_pipeline_ctx *pipe_ctx =
 617         (struct aes_128_cbc_pipeline_ctx *)EVP_CIPHER_CTX_cipher_data(ctx);
 618
 619     OPENSSL_clear_free(pipe_ctx->inner_cipher_data,
 620                        EVP_CIPHER_impl_ctx_size(EVP_aes_128_cbc()));
 621
 622     return 1;
 623 }