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;
 222     size_t v = cipher->block_size;
 223     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 224
 225     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_BLOCK_SIZE, &v);
 226     ok = evp_do_ciph_getparams(cipher, params);
 227
 228     return ok != 0 ? (int)v : EVP_CTRL_RET_UNSUPPORTED;
 229 }
 230
 231 int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
 232 {
 233     return EVP_CIPHER_block_size(ctx->cipher);
 234 }
 235
 236 int EVP_CIPHER_impl_ctx_size(const EVP_CIPHER *e)
 237 {
 238     return e->ctx_size;
 239 }
 240
 241 int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 242                const unsigned char *in, unsigned int inl)
 243 {
 244     if (ctx->cipher->prov != NULL) {
 245         size_t outl = 0;         /* ignored */
 246         int blocksize = EVP_CIPHER_CTX_block_size(ctx);
 247
 248         if (ctx->cipher->ccipher != NULL)
 249             return
 250                 ctx->cipher->ccipher(ctx->provctx, out, &outl,
 251                                      inl + (blocksize == 1 ? 0 : blocksize),
 252                                      in, (size_t)inl);
 253         return 0;
 254     }
 255
 256     return ctx->cipher->do_cipher(ctx, out, in, inl);
 257 }
 258
 259 const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
 260 {
 261     return ctx->cipher;
 262 }
 263
 264 int EVP_CIPHER_CTX_encrypting(const EVP_CIPHER_CTX *ctx)
 265 {
 266     return ctx->encrypt;
 267 }
 268
 269 unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
 270 {
 271     int ok;
 272     unsigned long v = cipher->flags;
 273     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 274
 275     params[0] = OSSL_PARAM_construct_ulong(OSSL_CIPHER_PARAM_FLAGS, &v);
 276     ok = evp_do_ciph_getparams(cipher, params);
 277
 278     return ok != 0 ? v : 0;
 279 }
 280
 281 void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
 282 {
 283     return ctx->app_data;
 284 }
 285
 286 void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
 287 {
 288     ctx->app_data = data;
 289 }
 290
 291 void *EVP_CIPHER_CTX_get_cipher_data(const EVP_CIPHER_CTX *ctx)
 292 {
 293     return ctx->cipher_data;
 294 }
 295
 296 void *EVP_CIPHER_CTX_set_cipher_data(EVP_CIPHER_CTX *ctx, void *cipher_data)
 297 {
 298     void *old_cipher_data;
 299
 300     old_cipher_data = ctx->cipher_data;
 301     ctx->cipher_data = cipher_data;
 302
 303     return old_cipher_data;
 304 }
 305
 306 int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
 307 {
 308     int ok;
 309     size_t v = cipher->iv_len;
 310     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 311
 312     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &v);
 313     ok = evp_do_ciph_getparams(cipher, params);
 314
 315     return ok != 0 ? (int)v : EVP_CTRL_RET_UNSUPPORTED;
 316 }
 317
 318 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
 319 {
 320     int rv, len = EVP_CIPHER_iv_length(ctx->cipher);
 321     size_t v = len;
 322     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 323
 324     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &v);
 325     rv = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 326     if (rv == EVP_CTRL_RET_UNSUPPORTED)
 327         goto legacy;
 328     return rv != 0 ? (int)v : -1;
 329     /* TODO (3.0) Remove legacy support */
 330 legacy:
 331     if ((EVP_CIPHER_flags(ctx->cipher) & EVP_CIPH_CUSTOM_IV_LENGTH) != 0) {
 332         rv = EVP_CIPHER_CTX_ctrl((EVP_CIPHER_CTX *)ctx, EVP_CTRL_GET_IVLEN,
 333                                  0, &len);
 334         return (rv == 1) ? len : -1;
 335     }
 336     return len;
 337 }
 338
 339 int EVP_CIPHER_CTX_tag_length(const EVP_CIPHER_CTX *ctx)
 340 {
 341     int ret;
 342     size_t v = 0;
 343     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 344
 345     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TAGLEN, &v);
 346     ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 347     return ret == 1 ? (int)v : 0;
 348 }
 349
 350 const unsigned char *EVP_CIPHER_CTX_original_iv(const EVP_CIPHER_CTX *ctx)
 351 {
 352     return ctx->oiv;
 353 }
 354
 355 /*
 356  * OSSL_PARAM_OCTET_PTR gets us the pointer to the running IV in the provider
 357  */
 358 const unsigned char *EVP_CIPHER_CTX_iv(const EVP_CIPHER_CTX *ctx)
 359 {
 360     int ok;
 361     const unsigned char *v = ctx->iv;
 362     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 363
 364     params[0] =
 365         OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_IV, (void **)&v,
 366                                        sizeof(ctx->iv));
 367     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 368
 369     return ok != 0 ? v : NULL;
 370 }
 371
 372 unsigned char *EVP_CIPHER_CTX_iv_noconst(EVP_CIPHER_CTX *ctx)
 373 {
 374     int ok;
 375     unsigned char *v = ctx->iv;
 376     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 377
 378     params[0] =
 379         OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_IV, (void **)&v,
 380                                        sizeof(ctx->iv));
 381     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 382
 383     return ok != 0 ? v : NULL;
 384 }
 385
 386 unsigned char *EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx)
 387 {
 388     return ctx->buf;
 389 }
 390
 391 int EVP_CIPHER_CTX_num(const EVP_CIPHER_CTX *ctx)
 392 {
 393     int ok;
 394     unsigned int v = (unsigned int)ctx->num;
 395     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 396
 397     params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_NUM, &v);
 398     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 399
 400     return ok != 0 ? (int)v : EVP_CTRL_RET_UNSUPPORTED;
 401 }
 402
 403 int EVP_CIPHER_CTX_set_num(EVP_CIPHER_CTX *ctx, int num)
 404 {
 405     int ok;
 406     unsigned int n = (unsigned int)num;
 407     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 408
 409     params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_NUM, &n);
 410     ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
 411
 412     if (ok != 0)
 413         ctx->num = (int)n;
 414     return ok != 0;
 415 }
 416
 417 int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
 418 {
 419     int ok;
 420     size_t v = cipher->key_len;
 421     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 422
 423     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &v);
 424     ok = evp_do_ciph_getparams(cipher, params);
 425
 426     return ok != 0 ? (int)v : EVP_CTRL_RET_UNSUPPORTED;
 427 }
 428
 429 int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
 430 {
 431     int ok;
 432     size_t v = ctx->key_len;
 433     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 434
 435     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &v);
 436     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 437
 438     return ok != 0 ? (int)v : EVP_CTRL_RET_UNSUPPORTED;
 439 }
 440
 441 int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
 442 {
 443     return cipher->nid;
 444 }
 445
 446 int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
 447 {
 448     return ctx->cipher->nid;
 449 }
 450
 451 const char *EVP_CIPHER_name(const EVP_CIPHER *cipher)
 452 {
 453     if (cipher->prov != NULL)
 454         return evp_first_name(cipher->prov, cipher->name_id);
 455 #ifndef FIPS_MODE
 456     return OBJ_nid2sn(EVP_CIPHER_nid(cipher));
 457 #else
 458     return NULL;
 459 #endif
 460 }
 461
 462 const OSSL_PROVIDER *EVP_CIPHER_provider(const EVP_CIPHER *cipher)
 463 {
 464     return cipher->prov;
 465 }
 466
 467 int EVP_CIPHER_mode(const EVP_CIPHER *cipher)
 468 {
 469     int ok;
 470     unsigned int v = EVP_CIPHER_flags(cipher) & EVP_CIPH_MODE;
 471     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 472
 473     params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_MODE, &v);
 474     ok = evp_do_ciph_getparams(cipher, params);
 475
 476     return ok != 0 ? (int)v : 0;
 477 }
 478
 479 const char *EVP_MD_name(const EVP_MD *md)
 480 {
 481     if (md->prov != NULL)
 482         return evp_first_name(md->prov, md->name_id);
 483 #ifndef FIPS_MODE
 484     return OBJ_nid2sn(EVP_MD_nid(md));
 485 #else
 486     return NULL;
 487 #endif
 488 }
 489
 490 const OSSL_PROVIDER *EVP_MD_provider(const EVP_MD *md)
 491 {
 492     return md->prov;
 493 }
 494
 495 int EVP_MD_block_size(const EVP_MD *md)
 496 {
 497     int ok;
 498     size_t v = md->block_size;
 499     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 500
 501     if (md == NULL) {
 502         EVPerr(EVP_F_EVP_MD_BLOCK_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
 503         return -1;
 504     }
 505
 506     params[0] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_BLOCK_SIZE, &v);
 507     ok = evp_do_md_getparams(md, params);
 508
 509     return ok != 0 ? (int)v : -1;
 510 }
 511
 512 int EVP_MD_type(const EVP_MD *md)
 513 {
 514     return md->type;
 515 }
 516
 517 int EVP_MD_pkey_type(const EVP_MD *md)
 518 {
 519     return md->pkey_type;
 520 }
 521
 522 int EVP_MD_size(const EVP_MD *md)
 523 {
 524     int ok;
 525     size_t v = md->md_size;
 526     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 527
 528     if (md == NULL) {
 529         EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
 530         return -1;
 531     }
 532
 533     params[0] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_SIZE, &v);
 534     ok = evp_do_md_getparams(md, params);
 535
 536     return ok != 0 ? (int)v : -1;
 537 }
 538
 539 unsigned long EVP_MD_flags(const EVP_MD *md)
 540 {
 541     int ok;
 542     unsigned long v = md->flags;
 543     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 544
 545     params[0] = OSSL_PARAM_construct_ulong(OSSL_CIPHER_PARAM_FLAGS, &v);
 546     ok = evp_do_md_getparams(md, params);
 547
 548     return ok != 0 ? v : 0;
 549 }
 550
 551 EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type)
 552 {
 553     EVP_MD *md = evp_md_new();
 554
 555     if (md != NULL) {
 556         md->type = md_type;
 557         md->pkey_type = pkey_type;
 558     }
 559     return md;
 560 }
 561
 562 EVP_MD *EVP_MD_meth_dup(const EVP_MD *md)
 563 {
 564     EVP_MD *to = NULL;
 565
 566     /*
 567      * Non-legacy EVP_MDs can't be duplicated like this.
 568      * Use EVP_MD_up_ref() instead.
 569      */
 570     if (md->prov != NULL)
 571         return NULL;
 572
 573     if ((to = EVP_MD_meth_new(md->type, md->pkey_type)) != NULL) {
 574         CRYPTO_RWLOCK *lock = to->lock;
 575
 576         memcpy(to, md, sizeof(*to));
 577         to->lock = lock;
 578     }
 579     return to;
 580 }
 581
 582 void EVP_MD_meth_free(EVP_MD *md)
 583 {
 584     EVP_MD_free(md);
 585 }
 586 int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize)
 587 {
 588     if (md->block_size != 0)
 589         return 0;
 590
 591     md->block_size = blocksize;
 592     return 1;
 593 }
 594 int EVP_MD_meth_set_result_size(EVP_MD *md, int resultsize)
 595 {
 596     if (md->md_size != 0)
 597         return 0;
 598
 599     md->md_size = resultsize;
 600     return 1;
 601 }
 602 int EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize)
 603 {
 604     if (md->ctx_size != 0)
 605         return 0;
 606
 607     md->ctx_size = datasize;
 608     return 1;
 609 }
 610 int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags)
 611 {
 612     if (md->flags != 0)
 613         return 0;
 614
 615     md->flags = flags;
 616     return 1;
 617 }
 618 int EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx))
 619 {
 620     if (md->init != NULL)
 621         return 0;
 622
 623     md->init = init;
 624     return 1;
 625 }
 626 int EVP_MD_meth_set_update(EVP_MD *md, int (*update)(EVP_MD_CTX *ctx,
 627                                                      const void *data,
 628                                                      size_t count))
 629 {
 630     if (md->update != NULL)
 631         return 0;
 632
 633     md->update = update;
 634     return 1;
 635 }
 636 int EVP_MD_meth_set_final(EVP_MD *md, int (*final)(EVP_MD_CTX *ctx,
 637                                                    unsigned char *md))
 638 {
 639     if (md->final != NULL)
 640         return 0;
 641
 642     md->final = final;
 643     return 1;
 644 }
 645 int EVP_MD_meth_set_copy(EVP_MD *md, int (*copy)(EVP_MD_CTX *to,
 646                                                  const EVP_MD_CTX *from))
 647 {
 648     if (md->copy != NULL)
 649         return 0;
 650
 651     md->copy = copy;
 652     return 1;
 653 }
 654 int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx))
 655 {
 656     if (md->cleanup != NULL)
 657         return 0;
 658
 659     md->cleanup = cleanup;
 660     return 1;
 661 }
 662 int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd,
 663                                                  int p1, void *p2))
 664 {
 665     if (md->md_ctrl != NULL)
 666         return 0;
 667
 668     md->md_ctrl = ctrl;
 669     return 1;
 670 }
 671
 672 int EVP_MD_meth_get_input_blocksize(const EVP_MD *md)
 673 {
 674     return md->block_size;
 675 }
 676 int EVP_MD_meth_get_result_size(const EVP_MD *md)
 677 {
 678     return md->md_size;
 679 }
 680 int EVP_MD_meth_get_app_datasize(const EVP_MD *md)
 681 {
 682     return md->ctx_size;
 683 }
 684 unsigned long EVP_MD_meth_get_flags(const EVP_MD *md)
 685 {
 686     return md->flags;
 687 }
 688 int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx)
 689 {
 690     return md->init;
 691 }
 692 int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx,
 693                                                 const void *data,
 694                                                 size_t count)
 695 {
 696     return md->update;
 697 }
 698 int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx,
 699                                                unsigned char *md)
 700 {
 701     return md->final;
 702 }
 703 int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to,
 704                                               const EVP_MD_CTX *from)
 705 {
 706     return md->copy;
 707 }
 708 int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx)
 709 {
 710     return md->cleanup;
 711 }
 712 int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd,
 713                                               int p1, void *p2)
 714 {
 715     return md->md_ctrl;
 716 }
 717
 718 const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
 719 {
 720     if (ctx == NULL)
 721         return NULL;
 722     return ctx->reqdigest;
 723 }
 724
 725 EVP_PKEY_CTX *EVP_MD_CTX_pkey_ctx(const EVP_MD_CTX *ctx)
 726 {
 727     return ctx->pctx;
 728 }
 729
 730 #if !defined(FIPS_MODE)
 731 /* TODO(3.0): EVP_DigestSign* not yet supported in FIPS module */
 732 void EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx)
 733 {
 734     /*
 735      * it's reasonable to set NULL pctx (a.k.a clear the ctx->pctx), so
 736      * we have to deal with the cleanup job here.
 737      */
 738     if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX))
 739         EVP_PKEY_CTX_free(ctx->pctx);
 740
 741     ctx->pctx = pctx;
 742
 743     if (pctx != NULL) {
 744         /* make sure pctx is not freed when destroying EVP_MD_CTX */
 745         EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
 746     } else {
 747         EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
 748     }
 749 }
 750 #endif /* !defined(FIPS_MODE) */
 751
 752 void *EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx)
 753 {
 754     return ctx->md_data;
 755 }
 756
 757 int (*EVP_MD_CTX_update_fn(EVP_MD_CTX *ctx))(EVP_MD_CTX *ctx,
 758                                              const void *data, size_t count)
 759 {
 760     return ctx->update;
 761 }
 762
 763 void EVP_MD_CTX_set_update_fn(EVP_MD_CTX *ctx,
 764                               int (*update) (EVP_MD_CTX *ctx,
 765                                              const void *data, size_t count))
 766 {
 767     ctx->update = update;
 768 }
 769
 770 void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
 771 {
 772     ctx->flags |= flags;
 773 }
 774
 775 void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
 776 {
 777     ctx->flags &= ~flags;
 778 }
 779
 780 int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
 781 {
 782     return (ctx->flags & flags);
 783 }
 784
 785 void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
 786 {
 787     ctx->flags |= flags;
 788 }
 789
 790 void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
 791 {
 792     ctx->flags &= ~flags;
 793 }
 794
 795 int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
 796 {
 797     return (ctx->flags & flags);
 798 }
 799
 800 int EVP_str2ctrl(int (*cb)(void *ctx, int cmd, void *buf, size_t buflen),
 801                  void *ctx, int cmd, const char *value)
 802 {
 803     size_t len;
 804
 805     len = strlen(value);
 806     if (len > INT_MAX)
 807         return -1;
 808     return cb(ctx, cmd, (void *)value, len);
 809 }
 810
 811 int EVP_hex2ctrl(int (*cb)(void *ctx, int cmd, void *buf, size_t buflen),
 812                  void *ctx, int cmd, const char *hex)
 813 {
 814     unsigned char *bin;
 815     long binlen;
 816     int rv = -1;
 817
 818     bin = OPENSSL_hexstr2buf(hex, &binlen);
 819     if (bin == NULL)
 820         return 0;
 821     if (binlen <= INT_MAX)
 822         rv = cb(ctx, cmd, bin, binlen);
 823     OPENSSL_free(bin);
 824     return rv;
 825 }