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 : -1;
 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 : -1;
 314 }
 315
 316 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
 317 {
 318     return EVP_CIPHER_iv_length(ctx->cipher);
 319 }
 320
 321 const unsigned char *EVP_CIPHER_CTX_original_iv(const EVP_CIPHER_CTX *ctx)
 322 {
 323     return ctx->oiv;
 324 }
 325
 326 /*
 327  * OSSL_PARAM_OCTET_PTR gets us the pointer to the running IV in the provider
 328  */
 329 const unsigned char *EVP_CIPHER_CTX_iv(const EVP_CIPHER_CTX *ctx)
 330 {
 331     int ok;
 332     const unsigned char *v = ctx->iv;
 333     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 334
 335     params[0] =
 336         OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_IV, (void **)&v,
 337                                        sizeof(ctx->iv));
 338     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 339
 340     return ok != 0 ? v : NULL;
 341 }
 342
 343 unsigned char *EVP_CIPHER_CTX_iv_noconst(EVP_CIPHER_CTX *ctx)
 344 {
 345     int ok;
 346     unsigned char *v = ctx->iv;
 347     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 348
 349     params[0] =
 350         OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_IV, (void **)&v,
 351                                        sizeof(ctx->iv));
 352     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 353
 354     return ok != 0 ? v : NULL;
 355 }
 356
 357 unsigned char *EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx)
 358 {
 359     return ctx->buf;
 360 }
 361
 362 int EVP_CIPHER_CTX_num(const EVP_CIPHER_CTX *ctx)
 363 {
 364     int ok, v = ctx->num;
 365     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 366
 367     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_NUM, &v);
 368     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 369
 370     return ok != 0 ? v : -1;
 371 }
 372
 373 int EVP_CIPHER_CTX_set_num(EVP_CIPHER_CTX *ctx, int num)
 374 {
 375     int ok;
 376     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 377
 378     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_NUM, &num);
 379     ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
 380
 381     if (ok != 0)
 382         ctx->num = num;
 383     return ok != 0;
 384 }
 385
 386 int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
 387 {
 388     int ok, v = cipher->key_len;
 389     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 390
 391     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &v);
 392     ok = evp_do_ciph_getparams(cipher, params);
 393
 394     return ok != 0 ? v : -1;
 395 }
 396
 397 int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
 398 {
 399     int ok, v = ctx->key_len;
 400     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 401
 402     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &v);
 403     ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
 404
 405     return ok != 0 ? v : -1;
 406 }
 407
 408 int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
 409 {
 410     return cipher->nid;
 411 }
 412
 413 int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
 414 {
 415     return ctx->cipher->nid;
 416 }
 417
 418 const char *EVP_CIPHER_name(const EVP_CIPHER *cipher)
 419 {
 420     if (cipher->prov != NULL)
 421         return cipher->name;
 422 #ifndef FIPS_MODE
 423     return OBJ_nid2sn(EVP_CIPHER_nid(cipher));
 424 #else
 425     return NULL;
 426 #endif
 427 }
 428
 429 const OSSL_PROVIDER *EVP_CIPHER_provider(const EVP_CIPHER *cipher)
 430 {
 431     return cipher->prov;
 432 }
 433
 434 int EVP_CIPHER_mode(const EVP_CIPHER *cipher)
 435 {
 436     int ok, v = EVP_CIPHER_flags(cipher) & EVP_CIPH_MODE;
 437     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 438
 439     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_MODE, &v);
 440     ok = evp_do_ciph_getparams(cipher, params);
 441
 442     return ok != 0 ? v : 0;
 443 }
 444
 445 const char *EVP_MD_name(const EVP_MD *md)
 446 {
 447     if (md->prov != NULL)
 448         return md->name;
 449 #ifndef FIPS_MODE
 450     return OBJ_nid2sn(EVP_MD_nid(md));
 451 #else
 452     return NULL;
 453 #endif
 454 }
 455
 456 const OSSL_PROVIDER *EVP_MD_provider(const EVP_MD *md)
 457 {
 458     return md->prov;
 459 }
 460
 461 int EVP_MD_block_size(const EVP_MD *md)
 462 {
 463     if (md == NULL) {
 464         EVPerr(EVP_F_EVP_MD_BLOCK_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
 465         return -1;
 466     }
 467
 468     if (md->prov != NULL && md->dblock_size != NULL)
 469         return (int)md->dblock_size();
 470
 471     return md->block_size;
 472 }
 473
 474 int EVP_MD_type(const EVP_MD *md)
 475 {
 476     return md->type;
 477 }
 478
 479 int EVP_MD_pkey_type(const EVP_MD *md)
 480 {
 481     return md->pkey_type;
 482 }
 483
 484 int EVP_MD_size(const EVP_MD *md)
 485 {
 486     if (!md) {
 487         EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
 488         return -1;
 489     }
 490
 491     if (md->prov != NULL && md->size != NULL)
 492         return (int)md->size();
 493
 494     return md->md_size;
 495 }
 496
 497 unsigned long EVP_MD_flags(const EVP_MD *md)
 498 {
 499     return md->flags;
 500 }
 501
 502 EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type)
 503 {
 504     EVP_MD *md = OPENSSL_zalloc(sizeof(*md));
 505
 506     if (md != NULL) {
 507         md->type = md_type;
 508         md->pkey_type = pkey_type;
 509         md->lock = CRYPTO_THREAD_lock_new();
 510         if (md->lock == NULL) {
 511             OPENSSL_free(md);
 512             return NULL;
 513         }
 514         md->refcnt = 1;
 515     }
 516     return md;
 517 }
 518
 519 EVP_MD *EVP_MD_meth_dup(const EVP_MD *md)
 520 {
 521     EVP_MD *to = EVP_MD_meth_new(md->type, md->pkey_type);
 522
 523     if (to != NULL) {
 524         CRYPTO_RWLOCK *lock = to->lock;
 525         memcpy(to, md, sizeof(*to));
 526         to->lock = lock;
 527     }
 528     return to;
 529 }
 530
 531 int EVP_MD_up_ref(EVP_MD *md)
 532 {
 533     int ref = 0;
 534
 535     CRYPTO_UP_REF(&md->refcnt, &ref, md->lock);
 536     return 1;
 537 }
 538
 539 void EVP_MD_meth_free(EVP_MD *md)
 540 {
 541     if (md != NULL) {
 542         int i;
 543
 544         CRYPTO_DOWN_REF(&md->refcnt, &i, md->lock);
 545         if (i > 0)
 546             return;
 547         ossl_provider_free(md->prov);
 548         OPENSSL_free(md->name);
 549         CRYPTO_THREAD_lock_free(md->lock);
 550         OPENSSL_free(md);
 551     }
 552 }
 553 int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize)
 554 {
 555     md->block_size = blocksize;
 556     return 1;
 557 }
 558 int EVP_MD_meth_set_result_size(EVP_MD *md, int resultsize)
 559 {
 560     md->md_size = resultsize;
 561     return 1;
 562 }
 563 int EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize)
 564 {
 565     md->ctx_size = datasize;
 566     return 1;
 567 }
 568 int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags)
 569 {
 570     md->flags = flags;
 571     return 1;
 572 }
 573 int EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx))
 574 {
 575     md->init = init;
 576     return 1;
 577 }
 578 int EVP_MD_meth_set_update(EVP_MD *md, int (*update)(EVP_MD_CTX *ctx,
 579                                                      const void *data,
 580                                                      size_t count))
 581 {
 582     md->update = update;
 583     return 1;
 584 }
 585 int EVP_MD_meth_set_final(EVP_MD *md, int (*final)(EVP_MD_CTX *ctx,
 586                                                    unsigned char *md))
 587 {
 588     md->final = final;
 589     return 1;
 590 }
 591 int EVP_MD_meth_set_copy(EVP_MD *md, int (*copy)(EVP_MD_CTX *to,
 592                                                  const EVP_MD_CTX *from))
 593 {
 594     md->copy = copy;
 595     return 1;
 596 }
 597 int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx))
 598 {
 599     md->cleanup = cleanup;
 600     return 1;
 601 }
 602 int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd,
 603                                                  int p1, void *p2))
 604 {
 605     md->md_ctrl = ctrl;
 606     return 1;
 607 }
 608
 609 int EVP_MD_meth_get_input_blocksize(const EVP_MD *md)
 610 {
 611     return md->block_size;
 612 }
 613 int EVP_MD_meth_get_result_size(const EVP_MD *md)
 614 {
 615     return md->md_size;
 616 }
 617 int EVP_MD_meth_get_app_datasize(const EVP_MD *md)
 618 {
 619     return md->ctx_size;
 620 }
 621 unsigned long EVP_MD_meth_get_flags(const EVP_MD *md)
 622 {
 623     return md->flags;
 624 }
 625 int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx)
 626 {
 627     return md->init;
 628 }
 629 int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx,
 630                                                 const void *data,
 631                                                 size_t count)
 632 {
 633     return md->update;
 634 }
 635 int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx,
 636                                                unsigned char *md)
 637 {
 638     return md->final;
 639 }
 640 int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to,
 641                                               const EVP_MD_CTX *from)
 642 {
 643     return md->copy;
 644 }
 645 int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx)
 646 {
 647     return md->cleanup;
 648 }
 649 int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd,
 650                                               int p1, void *p2)
 651 {
 652     return md->md_ctrl;
 653 }
 654
 655 const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
 656 {
 657     if (ctx == NULL)
 658         return NULL;
 659     return ctx->reqdigest;
 660 }
 661
 662 EVP_PKEY_CTX *EVP_MD_CTX_pkey_ctx(const EVP_MD_CTX *ctx)
 663 {
 664     return ctx->pctx;
 665 }
 666
 667 #if !defined(FIPS_MODE)
 668 /* TODO(3.0): EVP_DigestSign* not yet supported in FIPS module */
 669 void EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx)
 670 {
 671     /*
 672      * it's reasonable to set NULL pctx (a.k.a clear the ctx->pctx), so
 673      * we have to deal with the cleanup job here.
 674      */
 675     if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX))
 676         EVP_PKEY_CTX_free(ctx->pctx);
 677
 678     ctx->pctx = pctx;
 679
 680     if (pctx != NULL) {
 681         /* make sure pctx is not freed when destroying EVP_MD_CTX */
 682         EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
 683     } else {
 684         EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
 685     }
 686 }
 687 #endif /* !defined(FIPS_MODE) */
 688
 689 void *EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx)
 690 {
 691     return ctx->md_data;
 692 }
 693
 694 int (*EVP_MD_CTX_update_fn(EVP_MD_CTX *ctx))(EVP_MD_CTX *ctx,
 695                                              const void *data, size_t count)
 696 {
 697     return ctx->update;
 698 }
 699
 700 void EVP_MD_CTX_set_update_fn(EVP_MD_CTX *ctx,
 701                               int (*update) (EVP_MD_CTX *ctx,
 702                                              const void *data, size_t count))
 703 {
 704     ctx->update = update;
 705 }
 706
 707 void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
 708 {
 709     ctx->flags |= flags;
 710 }
 711
 712 void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
 713 {
 714     ctx->flags &= ~flags;
 715 }
 716
 717 int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
 718 {
 719     return (ctx->flags & flags);
 720 }
 721
 722 void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
 723 {
 724     ctx->flags |= flags;
 725 }
 726
 727 void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
 728 {
 729     ctx->flags &= ~flags;
 730 }
 731
 732 int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
 733 {
 734     return (ctx->flags & flags);
 735 }
 736
 737 int EVP_str2ctrl(int (*cb)(void *ctx, int cmd, void *buf, size_t buflen),
 738                  void *ctx, int cmd, const char *value)
 739 {
 740     size_t len;
 741
 742     len = strlen(value);
 743     if (len > INT_MAX)
 744         return -1;
 745     return cb(ctx, cmd, (void *)value, len);
 746 }
 747
 748 int EVP_hex2ctrl(int (*cb)(void *ctx, int cmd, void *buf, size_t buflen),
 749                  void *ctx, int cmd, const char *hex)
 750 {
 751     unsigned char *bin;
 752     long binlen;
 753     int rv = -1;
 754
 755     bin = OPENSSL_hexstr2buf(hex, &binlen);
 756     if (bin == NULL)
 757         return 0;
 758     if (binlen <= INT_MAX)
 759         rv = cb(ctx, cmd, bin, binlen);
 760     OPENSSL_free(bin);
 761     return rv;
 762 }