engines/e_dasync.c

   1 /*
   2  * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #if defined(_WIN32)
  11 # include <windows.h>
  12 #endif
  13
  14 #include <stdio.h>
  15 #include <string.h>
  16
  17 #include <openssl/engine.h>
  18 #include <openssl/sha.h>
  19 #include <openssl/aes.h>
  20 #include <openssl/rsa.h>
  21 #include <openssl/evp.h>
  22 #include <openssl/async.h>
  23 #include <openssl/bn.h>
  24 #include <openssl/crypto.h>
  25 #include <openssl/ssl.h>
  26 #include <openssl/modes.h>
  27
  28 #if defined(OPENSSL_SYS_UNIX) && defined(OPENSSL_THREADS)
  29 # undef ASYNC_POSIX
  30 # define ASYNC_POSIX
  31 # include <unistd.h>
  32 #elif defined(_WIN32)
  33 # undef ASYNC_WIN
  34 # define ASYNC_WIN
  35 #endif
  36
  37 #include "e_dasync_err.c"
  38
  39 /* Engine Id and Name */
  40 static const char *engine_dasync_id = "dasync";
  41 static const char *engine_dasync_name = "Dummy Async engine support";
  42
  43
  44 /* Engine Lifetime functions */
  45 static int dasync_destroy(ENGINE *e);
  46 static int dasync_init(ENGINE *e);
  47 static int dasync_finish(ENGINE *e);
  48 void engine_load_dasync_int(void);
  49
  50
  51 /* Set up digests. Just SHA1 for now */
  52 static int dasync_digests(ENGINE *e, const EVP_MD **digest,
  53                           const int **nids, int nid);
  54
  55 static void dummy_pause_job(void);
  56
  57 /* SHA1 */
  58 static int dasync_sha1_init(EVP_MD_CTX *ctx);
  59 static int dasync_sha1_update(EVP_MD_CTX *ctx, const void *data,
  60                              size_t count);
  61 static int dasync_sha1_final(EVP_MD_CTX *ctx, unsigned char *md);
  62
  63 /*
  64  * Holds the EVP_MD object for sha1 in this engine. Set up once only during
  65  * engine bind and can then be reused many times.
  66  */
  67 static EVP_MD *_hidden_sha1_md = NULL;
  68 static const EVP_MD *dasync_sha1(void)
  69 {
  70     return _hidden_sha1_md;
  71 }
  72 static void destroy_digests(void)
  73 {
  74     EVP_MD_meth_free(_hidden_sha1_md);
  75     _hidden_sha1_md = NULL;
  76 }
  77
  78 static int dasync_digest_nids(const int **nids)
  79 {
  80     static int digest_nids[2] = { 0, 0 };
  81     static int pos = 0;
  82     static int init = 0;
  83
  84     if (!init) {
  85         const EVP_MD *md;
  86         if ((md = dasync_sha1()) != NULL)
  87             digest_nids[pos++] = EVP_MD_type(md);
  88         digest_nids[pos] = 0;
  89         init = 1;
  90     }
  91     *nids = digest_nids;
  92     return pos;
  93 }
  94
  95 /* RSA */
  96
  97 static int dasync_pub_enc(int flen, const unsigned char *from,
  98                     unsigned char *to, RSA *rsa, int padding);
  99 static int dasync_pub_dec(int flen, const unsigned char *from,
 100                     unsigned char *to, RSA *rsa, int padding);
 101 static int dasync_rsa_priv_enc(int flen, const unsigned char *from,
 102                       unsigned char *to, RSA *rsa, int padding);
 103 static int dasync_rsa_priv_dec(int flen, const unsigned char *from,
 104                       unsigned char *to, RSA *rsa, int padding);
 105 static int dasync_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
 106                               BN_CTX *ctx);
 107
 108 static int dasync_rsa_init(RSA *rsa);
 109 static int dasync_rsa_finish(RSA *rsa);
 110
 111 static RSA_METHOD *dasync_rsa_method = NULL;
 112
 113 /* AES */
 114
 115 static int dasync_aes128_cbc_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
 116                                   void *ptr);
 117 static int dasync_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 118                                   const unsigned char *iv, int enc);
 119 static int dasync_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 120                                     const unsigned char *in, size_t inl);
 121 static int dasync_aes128_cbc_cleanup(EVP_CIPHER_CTX *ctx);
 122
 123 static int dasync_aes128_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type,
 124                                              int arg, void *ptr);
 125 static int dasync_aes128_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx,
 126                                                  const unsigned char *key,
 127                                                  const unsigned char *iv,
 128                                                  int enc);
 129 static int dasync_aes128_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx,
 130                                                unsigned char *out,
 131                                                const unsigned char *in,
 132                                                size_t inl);
 133 static int dasync_aes128_cbc_hmac_sha1_cleanup(EVP_CIPHER_CTX *ctx);
 134
 135 struct dasync_pipeline_ctx {
 136     void *inner_cipher_data;
 137     unsigned int numpipes;
 138     unsigned char **inbufs;
 139     unsigned char **outbufs;
 140     size_t *lens;
 141     unsigned char tlsaad[SSL_MAX_PIPELINES][EVP_AEAD_TLS1_AAD_LEN];
 142     unsigned int aadctr;
 143 };
 144
 145 /*
 146  * Holds the EVP_CIPHER object for aes_128_cbc in this engine. Set up once only
 147  * during engine bind and can then be reused many times.
 148  */
 149 static EVP_CIPHER *_hidden_aes_128_cbc = NULL;
 150 static const EVP_CIPHER *dasync_aes_128_cbc(void)
 151 {
 152     return _hidden_aes_128_cbc;
 153 }
 154
 155 /*
 156  * Holds the EVP_CIPHER object for aes_128_cbc_hmac_sha1 in this engine. Set up
 157  * once only during engine bind and can then be reused many times.
 158  *
 159  * This 'stitched' cipher depends on the EVP_aes_128_cbc_hmac_sha1() cipher,
 160  * which is implemented only if the AES-NI instruction set extension is available
 161  * (see OPENSSL_IA32CAP(3)). If that's not the case, then this cipher will not
 162  * be available either.
 163  *
 164  * Note: Since it is a legacy mac-then-encrypt cipher, modern TLS peers (which
 165  * negotiate the encrypt-then-mac extension) won't negotiate it anyway.
 166  */
 167 static EVP_CIPHER *_hidden_aes_128_cbc_hmac_sha1 = NULL;
 168 static const EVP_CIPHER *dasync_aes_128_cbc_hmac_sha1(void)
 169 {
 170     return _hidden_aes_128_cbc_hmac_sha1;
 171 }
 172
 173 static void destroy_ciphers(void)
 174 {
 175     EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
 176     EVP_CIPHER_meth_free(_hidden_aes_128_cbc_hmac_sha1);
 177     _hidden_aes_128_cbc = NULL;
 178     _hidden_aes_128_cbc_hmac_sha1 = NULL;
 179 }
 180
 181 static int dasync_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 182                                    const int **nids, int nid);
 183
 184 static int dasync_cipher_nids[] = {
 185     NID_aes_128_cbc,
 186     NID_aes_128_cbc_hmac_sha1,
 187     0
 188 };
 189
 190 static int bind_dasync(ENGINE *e)
 191 {
 192     /* Setup RSA_METHOD */
 193     if ((dasync_rsa_method = RSA_meth_new("Dummy Async RSA method", 0)) == NULL
 194         || RSA_meth_set_pub_enc(dasync_rsa_method, dasync_pub_enc) == 0
 195         || RSA_meth_set_pub_dec(dasync_rsa_method, dasync_pub_dec) == 0
 196         || RSA_meth_set_priv_enc(dasync_rsa_method, dasync_rsa_priv_enc) == 0
 197         || RSA_meth_set_priv_dec(dasync_rsa_method, dasync_rsa_priv_dec) == 0
 198         || RSA_meth_set_mod_exp(dasync_rsa_method, dasync_rsa_mod_exp) == 0
 199         || RSA_meth_set_bn_mod_exp(dasync_rsa_method, BN_mod_exp_mont) == 0
 200         || RSA_meth_set_init(dasync_rsa_method, dasync_rsa_init) == 0
 201         || RSA_meth_set_finish(dasync_rsa_method, dasync_rsa_finish) == 0) {
 202         DASYNCerr(DASYNC_F_BIND_DASYNC, DASYNC_R_INIT_FAILED);
 203         return 0;
 204     }
 205
 206     /* Ensure the dasync error handling is set up */
 207     ERR_load_DASYNC_strings();
 208
 209     if (!ENGINE_set_id(e, engine_dasync_id)
 210         || !ENGINE_set_name(e, engine_dasync_name)
 211         || !ENGINE_set_RSA(e, dasync_rsa_method)
 212         || !ENGINE_set_digests(e, dasync_digests)
 213         || !ENGINE_set_ciphers(e, dasync_ciphers)
 214         || !ENGINE_set_destroy_function(e, dasync_destroy)
 215         || !ENGINE_set_init_function(e, dasync_init)
 216         || !ENGINE_set_finish_function(e, dasync_finish)) {
 217         DASYNCerr(DASYNC_F_BIND_DASYNC, DASYNC_R_INIT_FAILED);
 218         return 0;
 219     }
 220
 221     /*
 222      * Set up the EVP_CIPHER and EVP_MD objects for the ciphers/digests
 223      * supplied by this engine
 224      */
 225     _hidden_sha1_md = EVP_MD_meth_new(NID_sha1, NID_sha1WithRSAEncryption);
 226     if (_hidden_sha1_md == NULL
 227         || !EVP_MD_meth_set_result_size(_hidden_sha1_md, SHA_DIGEST_LENGTH)
 228         || !EVP_MD_meth_set_input_blocksize(_hidden_sha1_md, SHA_CBLOCK)
 229         || !EVP_MD_meth_set_app_datasize(_hidden_sha1_md,
 230                                          sizeof(EVP_MD *) + sizeof(SHA_CTX))
 231         || !EVP_MD_meth_set_flags(_hidden_sha1_md, EVP_MD_FLAG_DIGALGID_ABSENT)
 232         || !EVP_MD_meth_set_init(_hidden_sha1_md, dasync_sha1_init)
 233         || !EVP_MD_meth_set_update(_hidden_sha1_md, dasync_sha1_update)
 234         || !EVP_MD_meth_set_final(_hidden_sha1_md, dasync_sha1_final)) {
 235         EVP_MD_meth_free(_hidden_sha1_md);
 236         _hidden_sha1_md = NULL;
 237     }
 238
 239     _hidden_aes_128_cbc = EVP_CIPHER_meth_new(NID_aes_128_cbc,
 240                                               16 /* block size */,
 241                                               16 /* key len */);
 242     if (_hidden_aes_128_cbc == NULL
 243             || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc,16)
 244             || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc,
 245                                           EVP_CIPH_FLAG_DEFAULT_ASN1
 246                                           | EVP_CIPH_CBC_MODE
 247                                           | EVP_CIPH_FLAG_PIPELINE)
 248             || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc,
 249                                          dasync_aes128_init_key)
 250             || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc,
 251                                               dasync_aes128_cbc_cipher)
 252             || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc,
 253                                             dasync_aes128_cbc_cleanup)
 254             || !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_cbc,
 255                                          dasync_aes128_cbc_ctrl)
 256             || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc,
 257                                 sizeof(struct dasync_pipeline_ctx))) {
 258         EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
 259         _hidden_aes_128_cbc = NULL;
 260     }
 261
 262     _hidden_aes_128_cbc_hmac_sha1 = EVP_CIPHER_meth_new(
 263                                                 NID_aes_128_cbc_hmac_sha1,
 264                                                 16 /* block size */,
 265                                                 16 /* key len */);
 266     if (_hidden_aes_128_cbc_hmac_sha1 == NULL
 267             || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc_hmac_sha1,16)
 268             || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc_hmac_sha1,
 269                                             EVP_CIPH_CBC_MODE
 270                                           | EVP_CIPH_FLAG_DEFAULT_ASN1
 271                                           | EVP_CIPH_FLAG_AEAD_CIPHER
 272                                           | EVP_CIPH_FLAG_PIPELINE)
 273             || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc_hmac_sha1,
 274                                          dasync_aes128_cbc_hmac_sha1_init_key)
 275             || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc_hmac_sha1,
 276                                             dasync_aes128_cbc_hmac_sha1_cipher)
 277             || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc_hmac_sha1,
 278                                             dasync_aes128_cbc_hmac_sha1_cleanup)
 279             || !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_cbc_hmac_sha1,
 280                                          dasync_aes128_cbc_hmac_sha1_ctrl)
 281             || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc_hmac_sha1,
 282                                 sizeof(struct dasync_pipeline_ctx))) {
 283         EVP_CIPHER_meth_free(_hidden_aes_128_cbc_hmac_sha1);
 284         _hidden_aes_128_cbc_hmac_sha1 = NULL;
 285     }
 286
 287     return 1;
 288 }
 289
 290 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
 291 static int bind_helper(ENGINE *e, const char *id)
 292 {
 293     if (id && (strcmp(id, engine_dasync_id) != 0))
 294         return 0;
 295     if (!bind_dasync(e))
 296         return 0;
 297     return 1;
 298 }
 299
 300 IMPLEMENT_DYNAMIC_CHECK_FN()
 301     IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
 302 # endif
 303
 304 static ENGINE *engine_dasync(void)
 305 {
 306     ENGINE *ret = ENGINE_new();
 307     if (!ret)
 308         return NULL;
 309     if (!bind_dasync(ret)) {
 310         ENGINE_free(ret);
 311         return NULL;
 312     }
 313     return ret;
 314 }
 315
 316 void engine_load_dasync_int(void)
 317 {
 318     ENGINE *toadd = engine_dasync();
 319     if (!toadd)
 320         return;
 321     ENGINE_add(toadd);
 322     ENGINE_free(toadd);
 323     ERR_clear_error();
 324 }
 325
 326 static int dasync_init(ENGINE *e)
 327 {
 328     return 1;
 329 }
 330
 331
 332 static int dasync_finish(ENGINE *e)
 333 {
 334     return 1;
 335 }
 336
 337
 338 static int dasync_destroy(ENGINE *e)
 339 {
 340     destroy_digests();
 341     destroy_ciphers();
 342     RSA_meth_free(dasync_rsa_method);
 343     ERR_unload_DASYNC_strings();
 344     return 1;
 345 }
 346
 347 static int dasync_digests(ENGINE *e, const EVP_MD **digest,
 348                           const int **nids, int nid)
 349 {
 350     int ok = 1;
 351     if (!digest) {
 352         /* We are returning a list of supported nids */
 353         return dasync_digest_nids(nids);
 354     }
 355     /* We are being asked for a specific digest */
 356     switch (nid) {
 357     case NID_sha1:
 358         *digest = dasync_sha1();
 359         break;
 360     default:
 361         ok = 0;
 362         *digest = NULL;
 363         break;
 364     }
 365     return ok;
 366 }
 367
 368 static int dasync_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 369                                    const int **nids, int nid)
 370 {
 371     int ok = 1;
 372     if (cipher == NULL) {
 373         /* We are returning a list of supported nids */
 374         *nids = dasync_cipher_nids;
 375         return (sizeof(dasync_cipher_nids) -
 376                 1) / sizeof(dasync_cipher_nids[0]);
 377     }
 378     /* We are being asked for a specific cipher */
 379     switch (nid) {
 380     case NID_aes_128_cbc:
 381         *cipher = dasync_aes_128_cbc();
 382         break;
 383     case NID_aes_128_cbc_hmac_sha1:
 384         *cipher = dasync_aes_128_cbc_hmac_sha1();
 385         break;
 386     default:
 387         ok = 0;
 388         *cipher = NULL;
 389         break;
 390     }
 391     return ok;
 392 }
 393
 394 static void wait_cleanup(ASYNC_WAIT_CTX *ctx, const void *key,
 395                          OSSL_ASYNC_FD readfd, void *pvwritefd)
 396 {
 397     OSSL_ASYNC_FD *pwritefd = (OSSL_ASYNC_FD *)pvwritefd;
 398 #if defined(ASYNC_WIN)
 399     CloseHandle(readfd);
 400     CloseHandle(*pwritefd);
 401 #elif defined(ASYNC_POSIX)
 402     close(readfd);
 403     close(*pwritefd);
 404 #endif
 405     OPENSSL_free(pwritefd);
 406 }
 407
 408 #define DUMMY_CHAR 'X'
 409
 410 static void dummy_pause_job(void) {
 411     ASYNC_JOB *job;
 412     ASYNC_WAIT_CTX *waitctx;
 413     ASYNC_callback_fn callback;
 414     void * callback_arg;
 415     OSSL_ASYNC_FD pipefds[2] = {0, 0};
 416     OSSL_ASYNC_FD *writefd;
 417 #if defined(ASYNC_WIN)
 418     DWORD numwritten, numread;
 419     char buf = DUMMY_CHAR;
 420 #elif defined(ASYNC_POSIX)
 421     char buf = DUMMY_CHAR;
 422 #endif
 423
 424     if ((job = ASYNC_get_current_job()) == NULL)
 425         return;
 426
 427     waitctx = ASYNC_get_wait_ctx(job);
 428
 429     if (ASYNC_WAIT_CTX_get_callback(waitctx, &callback, &callback_arg) && callback != NULL) {
 430         /*
 431          * In the Dummy async engine we are cheating. We call the callback that the job
 432          * is complete before the call to ASYNC_pause_job(). A real
 433          * async engine would only call the callback when the job was actually complete
 434          */
 435         (*callback)(callback_arg);
 436         ASYNC_pause_job();
 437         return;
 438     }
 439
 440
 441     if (ASYNC_WAIT_CTX_get_fd(waitctx, engine_dasync_id, &pipefds[0],
 442                               (void **)&writefd)) {
 443         pipefds[1] = *writefd;
 444     } else {
 445         writefd = OPENSSL_malloc(sizeof(*writefd));
 446         if (writefd == NULL)
 447             return;
 448 #if defined(ASYNC_WIN)
 449         if (CreatePipe(&pipefds[0], &pipefds[1], NULL, 256) == 0) {
 450             OPENSSL_free(writefd);
 451             return;
 452         }
 453 #elif defined(ASYNC_POSIX)
 454         if (pipe(pipefds) != 0) {
 455             OPENSSL_free(writefd);
 456             return;
 457         }
 458 #endif
 459         *writefd = pipefds[1];
 460
 461         if (!ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_dasync_id, pipefds[0],
 462                                         writefd, wait_cleanup)) {
 463             wait_cleanup(waitctx, engine_dasync_id, pipefds[0], writefd);
 464             return;
 465         }
 466     }
 467     /*
 468      * In the Dummy async engine we are cheating. We signal that the job
 469      * is complete by waking it before the call to ASYNC_pause_job(). A real
 470      * async engine would only wake when the job was actually complete
 471      */
 472 #if defined(ASYNC_WIN)
 473     WriteFile(pipefds[1], &buf, 1, &numwritten, NULL);
 474 #elif defined(ASYNC_POSIX)
 475     if (write(pipefds[1], &buf, 1) < 0)
 476         return;
 477 #endif
 478
 479     /* Ignore errors - we carry on anyway */
 480     ASYNC_pause_job();
 481
 482     /* Clear the wake signal */
 483 #if defined(ASYNC_WIN)
 484     ReadFile(pipefds[0], &buf, 1, &numread, NULL);
 485 #elif defined(ASYNC_POSIX)
 486     if (read(pipefds[0], &buf, 1) < 0)
 487         return;
 488 #endif
 489 }
 490
 491 /*
 492  * SHA1 implementation. At the moment we just defer to the standard
 493  * implementation
 494  */
 495 #undef data
 496 #define data(ctx) ((SHA_CTX *)EVP_MD_CTX_md_data(ctx))
 497 static int dasync_sha1_init(EVP_MD_CTX *ctx)
 498 {
 499     dummy_pause_job();
 500
 501     return SHA1_Init(data(ctx));
 502 }
 503
 504 static int dasync_sha1_update(EVP_MD_CTX *ctx, const void *data,
 505                              size_t count)
 506 {
 507     dummy_pause_job();
 508
 509     return SHA1_Update(data(ctx), data, (size_t)count);
 510 }
 511
 512 static int dasync_sha1_final(EVP_MD_CTX *ctx, unsigned char *md)
 513 {
 514     dummy_pause_job();
 515
 516     return SHA1_Final(md, data(ctx));
 517 }
 518
 519 /*
 520  * RSA implementation
 521  */
 522
 523 static int dasync_pub_enc(int flen, const unsigned char *from,
 524                     unsigned char *to, RSA *rsa, int padding) {
 525     /* Ignore errors - we carry on anyway */
 526     dummy_pause_job();
 527     return RSA_meth_get_pub_enc(RSA_PKCS1_OpenSSL())
 528         (flen, from, to, rsa, padding);
 529 }
 530
 531 static int dasync_pub_dec(int flen, const unsigned char *from,
 532                     unsigned char *to, RSA *rsa, int padding) {
 533     /* Ignore errors - we carry on anyway */
 534     dummy_pause_job();
 535     return RSA_meth_get_pub_dec(RSA_PKCS1_OpenSSL())
 536         (flen, from, to, rsa, padding);
 537 }
 538
 539 static int dasync_rsa_priv_enc(int flen, const unsigned char *from,
 540                       unsigned char *to, RSA *rsa, int padding)
 541 {
 542     /* Ignore errors - we carry on anyway */
 543     dummy_pause_job();
 544     return RSA_meth_get_priv_enc(RSA_PKCS1_OpenSSL())
 545         (flen, from, to, rsa, padding);
 546 }
 547
 548 static int dasync_rsa_priv_dec(int flen, const unsigned char *from,
 549                       unsigned char *to, RSA *rsa, int padding)
 550 {
 551     /* Ignore errors - we carry on anyway */
 552     dummy_pause_job();
 553     return RSA_meth_get_priv_dec(RSA_PKCS1_OpenSSL())
 554         (flen, from, to, rsa, padding);
 555 }
 556
 557 static int dasync_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
 558 {
 559     /* Ignore errors - we carry on anyway */
 560     dummy_pause_job();
 561     return RSA_meth_get_mod_exp(RSA_PKCS1_OpenSSL())(r0, I, rsa, ctx);
 562 }
 563
 564 static int dasync_rsa_init(RSA *rsa)
 565 {
 566     return RSA_meth_get_init(RSA_PKCS1_OpenSSL())(rsa);
 567 }
 568 static int dasync_rsa_finish(RSA *rsa)
 569 {
 570     return RSA_meth_get_finish(RSA_PKCS1_OpenSSL())(rsa);
 571 }
 572
 573 /* Cipher helper functions */
 574
 575 static int dasync_cipher_ctrl_helper(EVP_CIPHER_CTX *ctx, int type, int arg,
 576                                      void *ptr, int aeadcapable)
 577 {
 578     int ret;
 579     struct dasync_pipeline_ctx *pipe_ctx =
 580         (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
 581
 582     if (pipe_ctx == NULL)
 583         return 0;
 584
 585     switch (type) {
 586         case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS:
 587             pipe_ctx->numpipes = arg;
 588             pipe_ctx->outbufs = (unsigned char **)ptr;
 589             break;
 590
 591         case EVP_CTRL_SET_PIPELINE_INPUT_BUFS:
 592             pipe_ctx->numpipes = arg;
 593             pipe_ctx->inbufs = (unsigned char **)ptr;
 594             break;
 595
 596         case EVP_CTRL_SET_PIPELINE_INPUT_LENS:
 597             pipe_ctx->numpipes = arg;
 598             pipe_ctx->lens = (size_t *)ptr;
 599             break;
 600
 601         case EVP_CTRL_AEAD_SET_MAC_KEY:
 602             if (!aeadcapable)
 603                 return -1;
 604             EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
 605             ret = EVP_CIPHER_meth_get_ctrl(EVP_aes_128_cbc_hmac_sha1())
 606                                           (ctx, type, arg, ptr);
 607             EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
 608             return ret;
 609
 610         case EVP_CTRL_AEAD_TLS1_AAD:
 611         {
 612             unsigned char *p = ptr;
 613             unsigned int len;
 614
 615             if (!aeadcapable || arg != EVP_AEAD_TLS1_AAD_LEN)
 616                 return -1;
 617
 618             if (pipe_ctx->aadctr >= SSL_MAX_PIPELINES)
 619                 return -1;
 620
 621             memcpy(pipe_ctx->tlsaad[pipe_ctx->aadctr], ptr,
 622                    EVP_AEAD_TLS1_AAD_LEN);
 623             pipe_ctx->aadctr++;
 624
 625             len = p[arg - 2] << 8 | p[arg - 1];
 626
 627             if (EVP_CIPHER_CTX_encrypting(ctx)) {
 628                 if ((p[arg - 4] << 8 | p[arg - 3]) >= TLS1_1_VERSION) {
 629                     if (len < AES_BLOCK_SIZE)
 630                         return 0;
 631                     len -= AES_BLOCK_SIZE;
 632                 }
 633
 634                 return ((len + SHA_DIGEST_LENGTH + AES_BLOCK_SIZE)
 635                         & -AES_BLOCK_SIZE) - len;
 636             } else {
 637                 return SHA_DIGEST_LENGTH;
 638             }
 639         }
 640
 641         default:
 642             return 0;
 643     }
 644
 645     return 1;
 646 }
 647
 648 static int dasync_cipher_init_key_helper(EVP_CIPHER_CTX *ctx,
 649                                          const unsigned char *key,
 650                                          const unsigned char *iv, int enc,
 651                                          const EVP_CIPHER *cipher)
 652 {
 653     int ret;
 654     struct dasync_pipeline_ctx *pipe_ctx =
 655         (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
 656
 657     if (pipe_ctx->inner_cipher_data == NULL
 658             && EVP_CIPHER_impl_ctx_size(cipher) != 0) {
 659         pipe_ctx->inner_cipher_data = OPENSSL_zalloc(
 660             EVP_CIPHER_impl_ctx_size(cipher));
 661         if (pipe_ctx->inner_cipher_data == NULL) {
 662             DASYNCerr(DASYNC_F_DASYNC_CIPHER_INIT_KEY_HELPER,
 663                         ERR_R_MALLOC_FAILURE);
 664             return 0;
 665         }
 666     }
 667
 668     pipe_ctx->numpipes = 0;
 669     pipe_ctx->aadctr = 0;
 670
 671     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
 672     ret = EVP_CIPHER_meth_get_init(cipher)(ctx, key, iv, enc);
 673     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
 674
 675     return ret;
 676 }
 677
 678 static int dasync_cipher_helper(EVP_CIPHER_CTX *ctx, unsigned char *out,
 679                                 const unsigned char *in, size_t inl,
 680                                 const EVP_CIPHER *cipher)
 681 {
 682     int ret = 1;
 683     unsigned int i, pipes;
 684     struct dasync_pipeline_ctx *pipe_ctx =
 685         (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
 686
 687     pipes = pipe_ctx->numpipes;
 688     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx->inner_cipher_data);
 689     if (pipes == 0) {
 690         if (pipe_ctx->aadctr != 0) {
 691             if (pipe_ctx->aadctr != 1)
 692                 return -1;
 693             EVP_CIPHER_meth_get_ctrl(cipher)
 694                                     (ctx, EVP_CTRL_AEAD_TLS1_AAD,
 695                                      EVP_AEAD_TLS1_AAD_LEN,
 696                                      pipe_ctx->tlsaad[0]);
 697         }
 698         ret = EVP_CIPHER_meth_get_do_cipher(cipher)
 699                                            (ctx, out, in, inl);
 700     } else {
 701         if (pipe_ctx->aadctr > 0 && pipe_ctx->aadctr != pipes)
 702             return -1;
 703         for (i = 0; i < pipes; i++) {
 704             if (pipe_ctx->aadctr > 0) {
 705                 EVP_CIPHER_meth_get_ctrl(cipher)
 706                                         (ctx, EVP_CTRL_AEAD_TLS1_AAD,
 707                                          EVP_AEAD_TLS1_AAD_LEN,
 708                                          pipe_ctx->tlsaad[i]);
 709             }
 710             ret = ret && EVP_CIPHER_meth_get_do_cipher(cipher)
 711                                 (ctx, pipe_ctx->outbufs[i], pipe_ctx->inbufs[i],
 712                                  pipe_ctx->lens[i]);
 713         }
 714         pipe_ctx->numpipes = 0;
 715     }
 716     pipe_ctx->aadctr = 0;
 717     EVP_CIPHER_CTX_set_cipher_data(ctx, pipe_ctx);
 718     return ret;
 719 }
 720
 721 static int dasync_cipher_cleanup_helper(EVP_CIPHER_CTX *ctx,
 722                                         const EVP_CIPHER *cipher)
 723 {
 724     struct dasync_pipeline_ctx *pipe_ctx =
 725         (struct dasync_pipeline_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
 726
 727     OPENSSL_clear_free(pipe_ctx->inner_cipher_data,
 728                        EVP_CIPHER_impl_ctx_size(cipher));
 729
 730     return 1;
 731 }
 732
 733 /*
 734  * AES128 CBC Implementation
 735  */
 736
 737 static int dasync_aes128_cbc_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
 738                                   void *ptr)
 739 {
 740     return dasync_cipher_ctrl_helper(ctx, type, arg, ptr, 0);
 741 }
 742
 743 static int dasync_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 744                              const unsigned char *iv, int enc)
 745 {
 746     return dasync_cipher_init_key_helper(ctx, key, iv, enc, EVP_aes_128_cbc());
 747 }
 748
 749 static int dasync_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 750                                const unsigned char *in, size_t inl)
 751 {
 752     return dasync_cipher_helper(ctx, out, in, inl, EVP_aes_128_cbc());
 753 }
 754
 755 static int dasync_aes128_cbc_cleanup(EVP_CIPHER_CTX *ctx)
 756 {
 757     return dasync_cipher_cleanup_helper(ctx, EVP_aes_128_cbc());
 758 }
 759
 760
 761 /*
 762  * AES128 CBC HMAC SHA1 Implementation
 763  */
 764
 765 static int dasync_aes128_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type,
 766                                              int arg, void *ptr)
 767 {
 768     return dasync_cipher_ctrl_helper(ctx, type, arg, ptr, 1);
 769 }
 770
 771 static int dasync_aes128_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx,
 772                                                 const unsigned char *key,
 773                                                 const unsigned char *iv,
 774                                                 int enc)
 775 {
 776     /*
 777      * We can safely assume that EVP_aes_128_cbc_hmac_sha1() != NULL,
 778      * see comment before the definition of dasync_aes_128_cbc_hmac_sha1().
 779      */
 780     return dasync_cipher_init_key_helper(ctx, key, iv, enc,
 781                                          EVP_aes_128_cbc_hmac_sha1());
 782 }
 783
 784 static int dasync_aes128_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx,
 785                                                unsigned char *out,
 786                                                const unsigned char *in,
 787                                                size_t inl)
 788 {
 789     return dasync_cipher_helper(ctx, out, in, inl, EVP_aes_128_cbc_hmac_sha1());
 790 }
 791
 792 static int dasync_aes128_cbc_hmac_sha1_cleanup(EVP_CIPHER_CTX *ctx)
 793 {
 794     /*
 795      * We can safely assume that EVP_aes_128_cbc_hmac_sha1() != NULL,
 796      * see comment before the definition of dasync_aes_128_cbc_hmac_sha1().
 797      */
 798     return dasync_cipher_cleanup_helper(ctx, EVP_aes_128_cbc_hmac_sha1());
 799 }