crypto/evp/evp_lib.c

   1 /*
   2  * Copyright 1995-2018 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 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/evp.h>
  13 #include <openssl/objects.h>
  14 #include <openssl/params.h>
  15 #include <openssl/core_names.h>
  16 #include "internal/evp_int.h"
  17 #include "internal/provider.h"
  18 #include "evp_locl.h"
  19
  20 int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  21 {
  22     int ret;
  23     const EVP_CIPHER *cipher = c->cipher;
  24
  25     if (cipher->prov != NULL) {
  26         /*
  27          * The cipher has come from a provider and won't have the default flags.
  28          * Find the implicit form so we can check the flags.
  29          * TODO(3.0): This won't work for 3rd party ciphers we know nothing about
  30          * We'll need to think of something else for those.
  31          */
  32         cipher = EVP_get_cipherbynid(cipher->nid);
  33         if (cipher == NULL) {
  34             EVPerr(EVP_F_EVP_CIPHER_PARAM_TO_ASN1, ASN1_R_UNSUPPORTED_CIPHER);
  35             return -1;
  36         }
  37     }
  38
  39     if (cipher->set_asn1_parameters != NULL)
  40         ret = cipher->set_asn1_parameters(c, type);
  41     else if (cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {
  42         switch (EVP_CIPHER_mode(cipher)) {
  43         case EVP_CIPH_WRAP_MODE:
  44             if (EVP_CIPHER_nid(cipher) == NID_id_smime_alg_CMS3DESwrap)
  45                 ASN1_TYPE_set(type, V_ASN1_NULL, NULL);
  46             ret = 1;
  47             break;
  48
  49         case EVP_CIPH_GCM_MODE:
  50         case EVP_CIPH_CCM_MODE:
  51         case EVP_CIPH_XTS_MODE:
  52         case EVP_CIPH_OCB_MODE:
  53             ret = -2;
  54             break;
  55
  56         default:
  57             ret = EVP_CIPHER_set_asn1_iv(c, type);
  58         }
  59     } else
  60         ret = -1;
  61     if (ret <= 0)
  62         EVPerr(EVP_F_EVP_CIPHER_PARAM_TO_ASN1, ret == -2 ?
  63                ASN1_R_UNSUPPORTED_CIPHER :
  64                EVP_R_CIPHER_PARAMETER_ERROR);
  65     if (ret < -1)
  66         ret = -1;
  67     return ret;
  68 }
  69
  70 int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  71 {
  72     int ret;
  73     const EVP_CIPHER *cipher = c->cipher;
  74
  75     if (cipher->prov != NULL) {
  76         /*
  77          * The cipher has come from a provider and won't have the default flags.
  78          * Find the implicit form so we can check the flags.
  79          */
  80         cipher = EVP_get_cipherbynid(cipher->nid);
  81         if (cipher == NULL)
  82             return -1;
  83     }
  84
  85     if (cipher->get_asn1_parameters != NULL)
  86         ret = cipher->get_asn1_parameters(c, type);
  87     else if (cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {
  88         switch (EVP_CIPHER_mode(cipher)) {
  89
  90         case EVP_CIPH_WRAP_MODE:
  91             ret = 1;
  92             break;
  93
  94         case EVP_CIPH_GCM_MODE:
  95         case EVP_CIPH_CCM_MODE:
  96         case EVP_CIPH_XTS_MODE:
  97         case EVP_CIPH_OCB_MODE:
  98             ret = -2;
  99             break;
 100
 101         default:
 102             ret = EVP_CIPHER_get_asn1_iv(c, type);
 103             break;
 104         }
 105     } else
 106         ret = -1;
 107     if (ret <= 0)
 108         EVPerr(EVP_F_EVP_CIPHER_ASN1_TO_PARAM, ret == -2 ?
 109                EVP_R_UNSUPPORTED_CIPHER :
 110                EVP_R_CIPHER_PARAMETER_ERROR);
 111     if (ret < -1)
 112         ret = -1;
 113     return ret;
 114 }
 115
 116 int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *ctx, ASN1_TYPE *type)
 117 {
 118     int i = 0;
 119     unsigned int l;
 120
 121     if (type != NULL) {
 122         unsigned char iv[EVP_MAX_IV_LENGTH];
 123
 124         l = EVP_CIPHER_CTX_iv_length(ctx);
 125         if (!ossl_assert(l <= sizeof(iv)))
 126             return -1;
 127         i = ASN1_TYPE_get_octetstring(type, iv, l);
 128         if (i != (int)l)
 129             return -1;
 130
 131         if (!EVP_CipherInit_ex(ctx, NULL, NULL, NULL, iv, -1))
 132             return -1;
 133     }
 134     return i;
 135 }
 136
 137 int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 138 {
 139     int i = 0;
 140     unsigned int j;
 141
 142     if (type != NULL) {
 143         j = EVP_CIPHER_CTX_iv_length(c);
 144         OPENSSL_assert(j <= sizeof(c->iv));
 145         i = ASN1_TYPE_set_octetstring(type, c->oiv, j);
 146     }
 147     return i;
 148 }
 149
 150 /* Convert the various cipher NIDs and dummies to a proper OID NID */
 151 int EVP_CIPHER_type(const EVP_CIPHER *ctx)
 152 {
 153     int nid;
 154     ASN1_OBJECT *otmp;
 155     nid = EVP_CIPHER_nid(ctx);
 156
 157     switch (nid) {
 158
 159     case NID_rc2_cbc:
 160     case NID_rc2_64_cbc:
 161     case NID_rc2_40_cbc:
 162
 163         return NID_rc2_cbc;
 164
 165     case NID_rc4:
 166     case NID_rc4_40:
 167
 168         return NID_rc4;
 169
 170     case NID_aes_128_cfb128:
 171     case NID_aes_128_cfb8:
 172     case NID_aes_128_cfb1:
 173
 174         return NID_aes_128_cfb128;
 175
 176     case NID_aes_192_cfb128:
 177     case NID_aes_192_cfb8:
 178     case NID_aes_192_cfb1:
 179
 180         return NID_aes_192_cfb128;
 181
 182     case NID_aes_256_cfb128:
 183     case NID_aes_256_cfb8:
 184     case NID_aes_256_cfb1:
 185
 186         return NID_aes_256_cfb128;
 187
 188     case NID_des_cfb64:
 189     case NID_des_cfb8:
 190     case NID_des_cfb1:
 191
 192         return NID_des_cfb64;
 193
 194     case NID_des_ede3_cfb64:
 195     case NID_des_ede3_cfb8:
 196     case NID_des_ede3_cfb1:
 197
 198         return NID_des_cfb64;
 199
 200     default:
 201         /* Check it has an OID and it is valid */
 202         otmp = OBJ_nid2obj(nid);
 203         if (OBJ_get0_data(otmp) == NULL)
 204             nid = NID_undef;
 205         ASN1_OBJECT_free(otmp);
 206         return nid;
 207     }
 208 }
 209
 210 int EVP_CIPHER_block_size(const EVP_CIPHER *cipher)
 211 {
 212     if (cipher->prov != NULL) {
 213         if (cipher->blocksize != NULL)
 214             return cipher->blocksize();
 215         /* We default to a block size of 1 */
 216         return 1;
 217     }
 218     return cipher->block_size;
 219 }
 220
 221 int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
 222 {
 223     return EVP_CIPHER_block_size(ctx->cipher);
 224 }
 225
 226 int EVP_CIPHER_impl_ctx_size(const EVP_CIPHER *e)
 227 {
 228     return e->ctx_size;
 229 }
 230
 231 int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 232                const unsigned char *in, unsigned int inl)
 233 {
 234     if (ctx->cipher->prov != NULL) {
 235         if (ctx->cipher->ccipher != NULL)
 236             return ctx->cipher->ccipher(ctx->provctx, out, in, (size_t)inl);
 237         return 0;
 238     }
 239
 240     return ctx->cipher->do_cipher(ctx, out, in, inl);
 241 }
 242
 243 const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
 244 {
 245     return ctx->cipher;
 246 }
 247
 248 int EVP_CIPHER_CTX_encrypting(const EVP_CIPHER_CTX *ctx)
 249 {
 250     return ctx->encrypt;
 251 }
 252
 253 unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
 254 {
 255     return cipher->flags;
 256 }
 257
 258 void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
 259 {
 260     return ctx->app_data;
 261 }
 262
 263 void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
 264 {
 265     ctx->app_data = data;
 266 }
 267
 268 void *EVP_CIPHER_CTX_get_cipher_data(const EVP_CIPHER_CTX *ctx)
 269 {
 270     return ctx->cipher_data;
 271 }
 272
 273 void *EVP_CIPHER_CTX_set_cipher_data(EVP_CIPHER_CTX *ctx, void *cipher_data)
 274 {
 275     void *old_cipher_data;
 276
 277     old_cipher_data = ctx->cipher_data;
 278     ctx->cipher_data = cipher_data;
 279
 280     return old_cipher_data;
 281 }
 282
 283 int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
 284 {
 285     if (cipher->prov != NULL) {
 286         if (cipher->iv_length != NULL)
 287             return (int)cipher->iv_length();
 288         return 0;
 289     }
 290
 291     return cipher->iv_len;
 292 }
 293
 294 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
 295 {
 296     return EVP_CIPHER_iv_length(ctx->cipher);
 297 }
 298
 299 const unsigned char *EVP_CIPHER_CTX_original_iv(const EVP_CIPHER_CTX *ctx)
 300 {
 301     return ctx->oiv;
 302 }
 303
 304 const unsigned char *EVP_CIPHER_CTX_iv(const EVP_CIPHER_CTX *ctx)
 305 {
 306     return ctx->iv;
 307 }
 308
 309 unsigned char *EVP_CIPHER_CTX_iv_noconst(EVP_CIPHER_CTX *ctx)
 310 {
 311     return ctx->iv;
 312 }
 313
 314 unsigned char *EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx)
 315 {
 316     return ctx->buf;
 317 }
 318
 319 int EVP_CIPHER_CTX_num(const EVP_CIPHER_CTX *ctx)
 320 {
 321     return ctx->num;
 322 }
 323
 324 void EVP_CIPHER_CTX_set_num(EVP_CIPHER_CTX *ctx, int num)
 325 {
 326     ctx->num = num;
 327 }
 328
 329 int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
 330 {
 331     if (cipher->prov != NULL) {
 332         if (cipher->key_length != NULL)
 333             return (int)cipher->key_length();
 334         return -1;
 335     }
 336
 337     return cipher->key_len;
 338 }
 339
 340 int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
 341 {
 342     /*
 343      * TODO(3.0): This may need to change if/when we introduce variable length
 344      * key ciphers into the providers.
 345      */
 346     if (ctx->cipher != NULL && ctx->cipher->prov != NULL)
 347         return EVP_CIPHER_key_length(ctx->cipher);
 348     return ctx->key_len;
 349 }
 350
 351 int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
 352 {
 353     return cipher->nid;
 354 }
 355
 356 int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
 357 {
 358     return ctx->cipher->nid;
 359 }
 360
 361 int EVP_CIPHER_mode(const EVP_CIPHER *cipher)
 362 {
 363     if (cipher->prov != NULL) {
 364         int mode;
 365
 366         /* Cipher comes from a provider - so ask the provider for the mode */
 367         OSSL_PARAM params[] = {
 368             OSSL_PARAM_int(OSSL_CIPHER_PARAM_MODE, NULL),
 369             OSSL_PARAM_END
 370         };
 371
 372         params[0].data = &mode;
 373
 374         if (cipher->get_params == NULL) {
 375             EVPerr(EVP_F_EVP_CIPHER_MODE, EVP_R_CTRL_NOT_IMPLEMENTED);
 376             return 0;
 377         }
 378
 379         if (!cipher->get_params(params))
 380             return 0;
 381
 382         return mode;
 383     }
 384     return EVP_CIPHER_flags(cipher) & EVP_CIPH_MODE;
 385 }
 386
 387
 388 int EVP_MD_block_size(const EVP_MD *md)
 389 {
 390     if (md == NULL) {
 391         EVPerr(EVP_F_EVP_MD_BLOCK_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
 392         return -1;
 393     }
 394
 395     if (md->prov != NULL && md->dblock_size != NULL)
 396         return (int)md->dblock_size();
 397
 398     return md->block_size;
 399 }
 400
 401 int EVP_MD_type(const EVP_MD *md)
 402 {
 403     return md->type;
 404 }
 405
 406 int EVP_MD_pkey_type(const EVP_MD *md)
 407 {
 408     return md->pkey_type;
 409 }
 410
 411 int EVP_MD_size(const EVP_MD *md)
 412 {
 413     if (!md) {
 414         EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
 415         return -1;
 416     }
 417
 418     if (md->prov != NULL && md->size != NULL)
 419         return (int)md->size();
 420
 421     return md->md_size;
 422 }
 423
 424 unsigned long EVP_MD_flags(const EVP_MD *md)
 425 {
 426     return md->flags;
 427 }
 428
 429 EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type)
 430 {
 431     EVP_MD *md = OPENSSL_zalloc(sizeof(*md));
 432
 433     if (md != NULL) {
 434         md->type = md_type;
 435         md->pkey_type = pkey_type;
 436         md->lock = CRYPTO_THREAD_lock_new();
 437         if (md->lock == NULL) {
 438             OPENSSL_free(md);
 439             return NULL;
 440         }
 441         md->refcnt = 1;
 442     }
 443     return md;
 444 }
 445
 446 EVP_MD *EVP_MD_meth_dup(const EVP_MD *md)
 447 {
 448     EVP_MD *to = EVP_MD_meth_new(md->type, md->pkey_type);
 449
 450     if (to != NULL) {
 451         CRYPTO_RWLOCK *lock = to->lock;
 452         memcpy(to, md, sizeof(*to));
 453         to->lock = lock;
 454     }
 455     return to;
 456 }
 457
 458 int EVP_MD_upref(EVP_MD *md)
 459 {
 460     int ref = 0;
 461
 462     CRYPTO_UP_REF(&md->refcnt, &ref, md->lock);
 463     return 1;
 464 }
 465
 466 void EVP_MD_meth_free(EVP_MD *md)
 467 {
 468     if (md != NULL) {
 469         int i;
 470
 471         CRYPTO_DOWN_REF(&md->refcnt, &i, md->lock);
 472         if (i > 0)
 473             return;
 474         ossl_provider_free(md->prov);
 475         CRYPTO_THREAD_lock_free(md->lock);
 476         OPENSSL_free(md);
 477     }
 478 }
 479 int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize)
 480 {
 481     md->block_size = blocksize;
 482     return 1;
 483 }
 484 int EVP_MD_meth_set_result_size(EVP_MD *md, int resultsize)
 485 {
 486     md->md_size = resultsize;
 487     return 1;
 488 }
 489 int EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize)
 490 {
 491     md->ctx_size = datasize;
 492     return 1;
 493 }
 494 int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags)
 495 {
 496     md->flags = flags;
 497     return 1;
 498 }
 499 int EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx))
 500 {
 501     md->init = init;
 502     return 1;
 503 }
 504 int EVP_MD_meth_set_update(EVP_MD *md, int (*update)(EVP_MD_CTX *ctx,
 505                                                      const void *data,
 506                                                      size_t count))
 507 {
 508     md->update = update;
 509     return 1;
 510 }
 511 int EVP_MD_meth_set_final(EVP_MD *md, int (*final)(EVP_MD_CTX *ctx,
 512                                                    unsigned char *md))
 513 {
 514     md->final = final;
 515     return 1;
 516 }
 517 int EVP_MD_meth_set_copy(EVP_MD *md, int (*copy)(EVP_MD_CTX *to,
 518                                                  const EVP_MD_CTX *from))
 519 {
 520     md->copy = copy;
 521     return 1;
 522 }
 523 int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx))
 524 {
 525     md->cleanup = cleanup;
 526     return 1;
 527 }
 528 int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd,
 529                                                  int p1, void *p2))
 530 {
 531     md->md_ctrl = ctrl;
 532     return 1;
 533 }
 534
 535 int EVP_MD_meth_get_input_blocksize(const EVP_MD *md)
 536 {
 537     return md->block_size;
 538 }
 539 int EVP_MD_meth_get_result_size(const EVP_MD *md)
 540 {
 541     return md->md_size;
 542 }
 543 int EVP_MD_meth_get_app_datasize(const EVP_MD *md)
 544 {
 545     return md->ctx_size;
 546 }
 547 unsigned long EVP_MD_meth_get_flags(const EVP_MD *md)
 548 {
 549     return md->flags;
 550 }
 551 int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx)
 552 {
 553     return md->init;
 554 }
 555 int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx,
 556                                                 const void *data,
 557                                                 size_t count)
 558 {
 559     return md->update;
 560 }
 561 int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx,
 562                                                unsigned char *md)
 563 {
 564     return md->final;
 565 }
 566 int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to,
 567                                               const EVP_MD_CTX *from)
 568 {
 569     return md->copy;
 570 }
 571 int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx)
 572 {
 573     return md->cleanup;
 574 }
 575 int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd,
 576                                               int p1, void *p2)
 577 {
 578     return md->md_ctrl;
 579 }
 580
 581 const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
 582 {
 583     if (ctx == NULL)
 584         return NULL;
 585     return ctx->reqdigest;
 586 }
 587
 588 EVP_PKEY_CTX *EVP_MD_CTX_pkey_ctx(const EVP_MD_CTX *ctx)
 589 {
 590     return ctx->pctx;
 591 }
 592
 593 void EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx)
 594 {
 595     /*
 596      * it's reasonable to set NULL pctx (a.k.a clear the ctx->pctx), so
 597      * we have to deal with the cleanup job here.
 598      */
 599     if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX))
 600         EVP_PKEY_CTX_free(ctx->pctx);
 601
 602     ctx->pctx = pctx;
 603
 604     if (pctx != NULL) {
 605         /* make sure pctx is not freed when destroying EVP_MD_CTX */
 606         EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
 607     } else {
 608         EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
 609     }
 610 }
 611
 612 void *EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx)
 613 {
 614     return ctx->md_data;
 615 }
 616
 617 int (*EVP_MD_CTX_update_fn(EVP_MD_CTX *ctx))(EVP_MD_CTX *ctx,
 618                                              const void *data, size_t count)
 619 {
 620     return ctx->update;
 621 }
 622
 623 void EVP_MD_CTX_set_update_fn(EVP_MD_CTX *ctx,
 624                               int (*update) (EVP_MD_CTX *ctx,
 625                                              const void *data, size_t count))
 626 {
 627     ctx->update = update;
 628 }
 629
 630 void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
 631 {
 632     ctx->flags |= flags;
 633 }
 634
 635 void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
 636 {
 637     ctx->flags &= ~flags;
 638 }
 639
 640 int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
 641 {
 642     return (ctx->flags & flags);
 643 }
 644
 645 void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
 646 {
 647     ctx->flags |= flags;
 648 }
 649
 650 void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
 651 {
 652     ctx->flags &= ~flags;
 653 }
 654
 655 int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
 656 {
 657     return (ctx->flags & flags);
 658 }
 659
 660 int EVP_str2ctrl(int (*cb)(void *ctx, int cmd, void *buf, size_t buflen),
 661                  void *ctx, int cmd, const char *value)
 662 {
 663     size_t len;
 664
 665     len = strlen(value);
 666     if (len > INT_MAX)
 667         return -1;
 668     return cb(ctx, cmd, (void *)value, len);
 669 }
 670
 671 int EVP_hex2ctrl(int (*cb)(void *ctx, int cmd, void *buf, size_t buflen),
 672                  void *ctx, int cmd, const char *hex)
 673 {
 674     unsigned char *bin;
 675     long binlen;
 676     int rv = -1;
 677
 678     bin = OPENSSL_hexstr2buf(hex, &binlen);
 679     if (bin == NULL)
 680         return 0;
 681     if (binlen <= INT_MAX)
 682         rv = cb(ctx, cmd, bin, binlen);
 683     OPENSSL_free(bin);
 684     return rv;
 685 }