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 <openssl/dh.h>
  17 #include "internal/evp_int.h"
  18 #include "internal/provider.h"
  19 #include "evp_locl.h"
  20
  21 #if !defined(FIPS_MODE)
  22 int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  23 {
  24     int ret;
  25     const EVP_CIPHER *cipher = c->cipher;
  26
  27     if (cipher->prov != NULL) {
  28         /*
  29          * The cipher has come from a provider and won't have the default flags.
  30          * Find the implicit form so we can check the flags.
  31          * TODO(3.0): This won't work for 3rd party ciphers we know nothing about
  32          * We'll need to think of something else for those.
  33          */
  34         cipher = EVP_get_cipherbynid(cipher->nid);
  35         if (cipher == NULL) {
  36             EVPerr(EVP_F_EVP_CIPHER_PARAM_TO_ASN1, ASN1_R_UNSUPPORTED_CIPHER);
  37             return -1;
  38         }
  39     }
  40
  41     if (cipher->set_asn1_parameters != NULL)
  42         ret = cipher->set_asn1_parameters(c, type);
  43     else if (cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {
  44         switch (EVP_CIPHER_mode(cipher)) {
  45         case EVP_CIPH_WRAP_MODE:
  46             if (EVP_CIPHER_nid(cipher) == NID_id_smime_alg_CMS3DESwrap)
  47                 ASN1_TYPE_set(type, V_ASN1_NULL, NULL);
  48             ret = 1;
  49             break;
  50
  51         case EVP_CIPH_GCM_MODE:
  52         case EVP_CIPH_CCM_MODE:
  53         case EVP_CIPH_XTS_MODE:
  54         case EVP_CIPH_OCB_MODE:
  55             ret = -2;
  56             break;
  57
  58         default:
  59             ret = EVP_CIPHER_set_asn1_iv(c, type);
  60         }
  61     } else
  62         ret = -1;
  63     if (ret <= 0)
  64         EVPerr(EVP_F_EVP_CIPHER_PARAM_TO_ASN1, ret == -2 ?
  65                ASN1_R_UNSUPPORTED_CIPHER :
  66                EVP_R_CIPHER_PARAMETER_ERROR);
  67     if (ret < -1)
  68         ret = -1;
  69     return ret;
  70 }
  71
  72 int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  73 {
  74     int ret;
  75     const EVP_CIPHER *cipher = c->cipher;
  76
  77     if (cipher->prov != NULL) {
  78         /*
  79          * The cipher has come from a provider and won't have the default flags.
  80          * Find the implicit form so we can check the flags.
  81          */
  82         cipher = EVP_get_cipherbynid(cipher->nid);
  83         if (cipher == NULL)
  84             return -1;
  85     }
  86
  87     if (cipher->get_asn1_parameters != NULL)
  88         ret = cipher->get_asn1_parameters(c, type);
  89     else if (cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {
  90         switch (EVP_CIPHER_mode(cipher)) {
  91
  92         case EVP_CIPH_WRAP_MODE:
  93             ret = 1;
  94             break;
  95
  96         case EVP_CIPH_GCM_MODE:
  97         case EVP_CIPH_CCM_MODE:
  98         case EVP_CIPH_XTS_MODE:
  99         case EVP_CIPH_OCB_MODE:
 100             ret = -2;
 101             break;
 102
 103         default:
 104             ret = EVP_CIPHER_get_asn1_iv(c, type);
 105             break;
 106         }
 107     } else
 108         ret = -1;
 109     if (ret <= 0)
 110         EVPerr(EVP_F_EVP_CIPHER_ASN1_TO_PARAM, ret == -2 ?
 111                EVP_R_UNSUPPORTED_CIPHER :
 112                EVP_R_CIPHER_PARAMETER_ERROR);
 113     if (ret < -1)
 114         ret = -1;
 115     return ret;
 116 }
 117
 118 int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *ctx, ASN1_TYPE *type)
 119 {
 120     int i = 0;
 121     unsigned int l;
 122
 123     if (type != NULL) {
 124         unsigned char iv[EVP_MAX_IV_LENGTH];
 125
 126         l = EVP_CIPHER_CTX_iv_length(ctx);
 127         if (!ossl_assert(l <= sizeof(iv)))
 128             return -1;
 129         i = ASN1_TYPE_get_octetstring(type, iv, l);
 130         if (i != (int)l)
 131             return -1;
 132
 133         if (!EVP_CipherInit_ex(ctx, NULL, NULL, NULL, iv, -1))
 134             return -1;
 135     }
 136     return i;
 137 }
 138
 139 int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 140 {
 141     int i = 0;
 142     unsigned int j;
 143
 144     if (type != NULL) {
 145         j = EVP_CIPHER_CTX_iv_length(c);
 146         OPENSSL_assert(j <= sizeof(c->iv));
 147         i = ASN1_TYPE_set_octetstring(type, c->oiv, j);
 148     }
 149     return i;
 150 }
 151 #endif /* !defined(FIPS_MODE) */
 152
 153 /* Convert the various cipher NIDs and dummies to a proper OID NID */
 154 int EVP_CIPHER_type(const EVP_CIPHER *ctx)
 155 {
 156     int nid;
 157     nid = EVP_CIPHER_nid(ctx);
 158
 159     switch (nid) {
 160
 161     case NID_rc2_cbc:
 162     case NID_rc2_64_cbc:
 163     case NID_rc2_40_cbc:
 164
 165         return NID_rc2_cbc;
 166
 167     case NID_rc4:
 168     case NID_rc4_40:
 169
 170         return NID_rc4;
 171
 172     case NID_aes_128_cfb128:
 173     case NID_aes_128_cfb8:
 174     case NID_aes_128_cfb1:
 175
 176         return NID_aes_128_cfb128;
 177
 178     case NID_aes_192_cfb128:
 179     case NID_aes_192_cfb8:
 180     case NID_aes_192_cfb1:
 181
 182         return NID_aes_192_cfb128;
 183
 184     case NID_aes_256_cfb128:
 185     case NID_aes_256_cfb8:
 186     case NID_aes_256_cfb1:
 187
 188         return NID_aes_256_cfb128;
 189
 190     case NID_des_cfb64:
 191     case NID_des_cfb8:
 192     case NID_des_cfb1:
 193
 194         return NID_des_cfb64;
 195
 196     case NID_des_ede3_cfb64:
 197     case NID_des_ede3_cfb8:
 198     case NID_des_ede3_cfb1:
 199
 200         return NID_des_cfb64;
 201
 202     default:
 203 #ifdef FIPS_MODE
 204         return NID_undef;
 205 #else
 206         {
 207             /* Check it has an OID and it is valid */
 208             ASN1_OBJECT *otmp = OBJ_nid2obj(nid);
 209
 210             if (OBJ_get0_data(otmp) == NULL)
 211                 nid = NID_undef;
 212             ASN1_OBJECT_free(otmp);
 213             return nid;
 214         }
 215 #endif
 216     }
 217 }
 218
 219 int EVP_CIPHER_block_size(const EVP_CIPHER *cipher)
 220 {
 221     int ok, v = cipher->block_size;
 222     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 223
 224     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_BLOCK_SIZE, &v);
 225     ok = evp_do_ciph_getparams(cipher, params);
 226
 227     return ok != 0 ? v : EVP_CTRL_RET_UNSUPPORTED;
 228 }
 229
 230 int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
 231 {
 232     return EVP_CIPHER_block_size(ctx->cipher);
 233 }
 234
 235 int EVP_CIPHER_impl_ctx_size(const EVP_CIPHER *e)
 236 {
 237     return e->ctx_size;
 238 }
 239
 240 int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 241                const unsigned char *in, unsigned int inl)
 242 {
 243     if (ctx->cipher->prov != NULL) {
 244         size_t outl = 0;         /* ignored */
 245         int blocksize = EVP_CIPHER_CTX_block_size(ctx);
 246
 247         if (ctx->cipher->ccipher != NULL)
 248             return
 249                 ctx->cipher->ccipher(ctx->provctx, out, &outl,
 250                                      inl + (blocksize == 1 ? 0 : blocksize),
 251                                      in, (size_t)inl);
 252         return 0;
 253     }
 254
 255     return ctx->cipher->do_cipher(ctx, out, in, inl);
 256 }
 257
 258 const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
 259 {
 260     return ctx->cipher;
 261 }
 262
 263 int EVP_CIPHER_CTX_encrypting(const EVP_CIPHER_CTX *ctx)
 264 {
 265     return ctx->encrypt;
 266 }
 267
 268 unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
 269 {
 270     int ok;
 271     unsigned long v = cipher->flags;
 272     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 273
 274     params[0] = OSSL_PARAM_construct_ulong(OSSL_CIPHER_PARAM_FLAGS, &v);
 275     ok = evp_do_ciph_getparams(cipher, params);
 276
 277     return ok != 0 ? v : 0;
 278 }
 279
 280 void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
 281 {
 282     return ctx->app_data;
 283 }
 284
 285 void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
 286 {
 287     ctx->app_data = data;
 288 }
 289
 290 void *EVP_CIPHER_CTX_get_cipher_data(const EVP_CIPHER_CTX *ctx)
 291 {
 292     return ctx->cipher_data;
 293 }
 294
 295 void *EVP_CIPHER_CTX_set_cipher_data(EVP_CIPHER_CTX *ctx, void *cipher_data)
 296 {
 297     void *old_cipher_data;
 298
 299     old_cipher_data = ctx->cipher_data;
 300     ctx->cipher_data = cipher_data;
 301
 302     return old_cipher_data;
 303 }
 304
 305 int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
 306 {
 307     int ok, v = cipher->iv_len;
 308     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 309
 310     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_IVLEN, &v);
 311     ok = evp_do_ciph_getparams(cipher, params);
 312
 313     return ok != 0 ? v : EVP_CTRL_RET_UNSUPPORTED;
 314 }
 315
 316 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
 317 {
 318     int ok, v = EVP_CIPHER_iv_length(ctx->cipher);
 319     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 320
 321     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_IVLEN, &v);
 322     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 323
 324     return ok != 0 ? v : -1;
 325 }
 326
 327 const unsigned char *EVP_CIPHER_CTX_original_iv(const EVP_CIPHER_CTX *ctx)
 328 {
 329     return ctx->oiv;
 330 }
 331
 332 /*
 333  * OSSL_PARAM_OCTET_PTR gets us the pointer to the running IV in the provider
 334  */
 335 const unsigned char *EVP_CIPHER_CTX_iv(const EVP_CIPHER_CTX *ctx)
 336 {
 337     int ok;
 338     const unsigned char *v = ctx->iv;
 339     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 340
 341     params[0] =
 342         OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_IV, (void **)&v,
 343                                        sizeof(ctx->iv));
 344     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 345
 346     return ok != 0 ? v : NULL;
 347 }
 348
 349 unsigned char *EVP_CIPHER_CTX_iv_noconst(EVP_CIPHER_CTX *ctx)
 350 {
 351     int ok;
 352     unsigned char *v = ctx->iv;
 353     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 354
 355     params[0] =
 356         OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_IV, (void **)&v,
 357                                        sizeof(ctx->iv));
 358     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 359
 360     return ok != 0 ? v : NULL;
 361 }
 362
 363 unsigned char *EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx)
 364 {
 365     return ctx->buf;
 366 }
 367
 368 int EVP_CIPHER_CTX_num(const EVP_CIPHER_CTX *ctx)
 369 {
 370     int ok, v = ctx->num;
 371     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 372
 373     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_NUM, &v);
 374     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 375
 376     return ok != 0 ? v : EVP_CTRL_RET_UNSUPPORTED;
 377 }
 378
 379 int EVP_CIPHER_CTX_set_num(EVP_CIPHER_CTX *ctx, int num)
 380 {
 381     int ok;
 382     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 383
 384     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_NUM, &num);
 385     ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
 386
 387     if (ok != 0)
 388         ctx->num = num;
 389     return ok != 0;
 390 }
 391
 392 int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
 393 {
 394     int ok, v = cipher->key_len;
 395     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 396
 397     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &v);
 398     ok = evp_do_ciph_getparams(cipher, params);
 399
 400     return ok != 0 ? v : EVP_CTRL_RET_UNSUPPORTED;
 401 }
 402
 403 int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
 404 {
 405     int ok, v = ctx->key_len;
 406     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 407
 408     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &v);
 409     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 410
 411     return ok != 0 ? v : EVP_CTRL_RET_UNSUPPORTED;
 412 }
 413
 414 int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
 415 {
 416     return cipher->nid;
 417 }
 418
 419 int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
 420 {
 421     return ctx->cipher->nid;
 422 }
 423
 424 const char *EVP_CIPHER_name(const EVP_CIPHER *cipher)
 425 {
 426     if (cipher->prov != NULL)
 427         return cipher->name;
 428 #ifndef FIPS_MODE
 429     return OBJ_nid2sn(EVP_CIPHER_nid(cipher));
 430 #else
 431     return NULL;
 432 #endif
 433 }
 434
 435 const OSSL_PROVIDER *EVP_CIPHER_provider(const EVP_CIPHER *cipher)
 436 {
 437     return cipher->prov;
 438 }
 439
 440 int EVP_CIPHER_mode(const EVP_CIPHER *cipher)
 441 {
 442     int ok, v = EVP_CIPHER_flags(cipher) & EVP_CIPH_MODE;
 443     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 444
 445     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_MODE, &v);
 446     ok = evp_do_ciph_getparams(cipher, params);
 447
 448     return ok != 0 ? v : 0;
 449 }
 450
 451 const char *EVP_MD_name(const EVP_MD *md)
 452 {
 453     if (md->prov != NULL)
 454         return md->name;
 455 #ifndef FIPS_MODE
 456     return OBJ_nid2sn(EVP_MD_nid(md));
 457 #else
 458     return NULL;
 459 #endif
 460 }
 461
 462 const OSSL_PROVIDER *EVP_MD_provider(const EVP_MD *md)
 463 {
 464     return md->prov;
 465 }
 466
 467 int EVP_MD_block_size(const EVP_MD *md)
 468 {
 469     if (md == NULL) {
 470         EVPerr(EVP_F_EVP_MD_BLOCK_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
 471         return -1;
 472     }
 473
 474     if (md->prov != NULL && md->dblock_size != NULL)
 475         return (int)md->dblock_size();
 476
 477     return md->block_size;
 478 }
 479
 480 int EVP_MD_type(const EVP_MD *md)
 481 {
 482     return md->type;
 483 }
 484
 485 int EVP_MD_pkey_type(const EVP_MD *md)
 486 {
 487     return md->pkey_type;
 488 }
 489
 490 int EVP_MD_size(const EVP_MD *md)
 491 {
 492     if (!md) {
 493         EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
 494         return -1;
 495     }
 496
 497     if (md->prov != NULL && md->size != NULL)
 498         return (int)md->size();
 499
 500     return md->md_size;
 501 }
 502
 503 unsigned long EVP_MD_flags(const EVP_MD *md)
 504 {
 505     return md->flags;
 506 }
 507
 508 EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type)
 509 {
 510     EVP_MD *md = OPENSSL_zalloc(sizeof(*md));
 511
 512     if (md != NULL) {
 513         md->type = md_type;
 514         md->pkey_type = pkey_type;
 515         md->lock = CRYPTO_THREAD_lock_new();
 516         if (md->lock == NULL) {
 517             OPENSSL_free(md);
 518             return NULL;
 519         }
 520         md->refcnt = 1;
 521     }
 522     return md;
 523 }
 524
 525 EVP_MD *EVP_MD_meth_dup(const EVP_MD *md)
 526 {
 527     EVP_MD *to = EVP_MD_meth_new(md->type, md->pkey_type);
 528
 529     if (to != NULL) {
 530         CRYPTO_RWLOCK *lock = to->lock;
 531         memcpy(to, md, sizeof(*to));
 532         to->lock = lock;
 533     }
 534     return to;
 535 }
 536
 537 int EVP_MD_up_ref(EVP_MD *md)
 538 {
 539     int ref = 0;
 540
 541     CRYPTO_UP_REF(&md->refcnt, &ref, md->lock);
 542     return 1;
 543 }
 544
 545 void EVP_MD_meth_free(EVP_MD *md)
 546 {
 547     if (md != NULL) {
 548         int i;
 549
 550         CRYPTO_DOWN_REF(&md->refcnt, &i, md->lock);
 551         if (i > 0)
 552             return;
 553         ossl_provider_free(md->prov);
 554         OPENSSL_free(md->name);
 555         CRYPTO_THREAD_lock_free(md->lock);
 556         OPENSSL_free(md);
 557     }
 558 }
 559 int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize)
 560 {
 561     md->block_size = blocksize;
 562     return 1;
 563 }
 564 int EVP_MD_meth_set_result_size(EVP_MD *md, int resultsize)
 565 {
 566     md->md_size = resultsize;
 567     return 1;
 568 }
 569 int EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize)
 570 {
 571     md->ctx_size = datasize;
 572     return 1;
 573 }
 574 int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags)
 575 {
 576     md->flags = flags;
 577     return 1;
 578 }
 579 int EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx))
 580 {
 581     md->init = init;
 582     return 1;
 583 }
 584 int EVP_MD_meth_set_update(EVP_MD *md, int (*update)(EVP_MD_CTX *ctx,
 585                                                      const void *data,
 586                                                      size_t count))
 587 {
 588     md->update = update;
 589     return 1;
 590 }
 591 int EVP_MD_meth_set_final(EVP_MD *md, int (*final)(EVP_MD_CTX *ctx,
 592                                                    unsigned char *md))
 593 {
 594     md->final = final;
 595     return 1;
 596 }
 597 int EVP_MD_meth_set_copy(EVP_MD *md, int (*copy)(EVP_MD_CTX *to,
 598                                                  const EVP_MD_CTX *from))
 599 {
 600     md->copy = copy;
 601     return 1;
 602 }
 603 int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx))
 604 {
 605     md->cleanup = cleanup;
 606     return 1;
 607 }
 608 int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd,
 609                                                  int p1, void *p2))
 610 {
 611     md->md_ctrl = ctrl;
 612     return 1;
 613 }
 614
 615 int EVP_MD_meth_get_input_blocksize(const EVP_MD *md)
 616 {
 617     return md->block_size;
 618 }
 619 int EVP_MD_meth_get_result_size(const EVP_MD *md)
 620 {
 621     return md->md_size;
 622 }
 623 int EVP_MD_meth_get_app_datasize(const EVP_MD *md)
 624 {
 625     return md->ctx_size;
 626 }
 627 unsigned long EVP_MD_meth_get_flags(const EVP_MD *md)
 628 {
 629     return md->flags;
 630 }
 631 int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx)
 632 {
 633     return md->init;
 634 }
 635 int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx,
 636                                                 const void *data,
 637                                                 size_t count)
 638 {
 639     return md->update;
 640 }
 641 int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx,
 642                                                unsigned char *md)
 643 {
 644     return md->final;
 645 }
 646 int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to,
 647                                               const EVP_MD_CTX *from)
 648 {
 649     return md->copy;
 650 }
 651 int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx)
 652 {
 653     return md->cleanup;
 654 }
 655 int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd,
 656                                               int p1, void *p2)
 657 {
 658     return md->md_ctrl;
 659 }
 660
 661 const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
 662 {
 663     if (ctx == NULL)
 664         return NULL;
 665     return ctx->reqdigest;
 666 }
 667
 668 EVP_PKEY_CTX *EVP_MD_CTX_pkey_ctx(const EVP_MD_CTX *ctx)
 669 {
 670     return ctx->pctx;
 671 }
 672
 673 #if !defined(FIPS_MODE)
 674 /* TODO(3.0): EVP_DigestSign* not yet supported in FIPS module */
 675 void EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx)
 676 {
 677     /*
 678      * it's reasonable to set NULL pctx (a.k.a clear the ctx->pctx), so
 679      * we have to deal with the cleanup job here.
 680      */
 681     if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX))
 682         EVP_PKEY_CTX_free(ctx->pctx);
 683
 684     ctx->pctx = pctx;
 685
 686     if (pctx != NULL) {
 687         /* make sure pctx is not freed when destroying EVP_MD_CTX */
 688         EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
 689     } else {
 690         EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
 691     }
 692 }
 693 #endif /* !defined(FIPS_MODE) */
 694
 695 void *EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx)
 696 {
 697     return ctx->md_data;
 698 }
 699
 700 int (*EVP_MD_CTX_update_fn(EVP_MD_CTX *ctx))(EVP_MD_CTX *ctx,
 701                                              const void *data, size_t count)
 702 {
 703     return ctx->update;
 704 }
 705
 706 void EVP_MD_CTX_set_update_fn(EVP_MD_CTX *ctx,
 707                               int (*update) (EVP_MD_CTX *ctx,
 708                                              const void *data, size_t count))
 709 {
 710     ctx->update = update;
 711 }
 712
 713 void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
 714 {
 715     ctx->flags |= flags;
 716 }
 717
 718 void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
 719 {
 720     ctx->flags &= ~flags;
 721 }
 722
 723 int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
 724 {
 725     return (ctx->flags & flags);
 726 }
 727
 728 void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
 729 {
 730     ctx->flags |= flags;
 731 }
 732
 733 void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
 734 {
 735     ctx->flags &= ~flags;
 736 }
 737
 738 int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
 739 {
 740     return (ctx->flags & flags);
 741 }
 742
 743 int EVP_str2ctrl(int (*cb)(void *ctx, int cmd, void *buf, size_t buflen),
 744                  void *ctx, int cmd, const char *value)
 745 {
 746     size_t len;
 747
 748     len = strlen(value);
 749     if (len > INT_MAX)
 750         return -1;
 751     return cb(ctx, cmd, (void *)value, len);
 752 }
 753
 754 int EVP_hex2ctrl(int (*cb)(void *ctx, int cmd, void *buf, size_t buflen),
 755                  void *ctx, int cmd, const char *hex)
 756 {
 757     unsigned char *bin;
 758     long binlen;
 759     int rv = -1;
 760
 761     bin = OPENSSL_hexstr2buf(hex, &binlen);
 762     if (bin == NULL)
 763         return 0;
 764     if (binlen <= INT_MAX)
 765         rv = cb(ctx, cmd, bin, binlen);
 766     OPENSSL_free(bin);
 767     return rv;
 768 }