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