crypto/evp/evp_enc.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 <assert.h>
  12 #include "internal/cryptlib.h"
  13 #include <openssl/evp.h>
  14 #include <openssl/err.h>
  15 #include <openssl/rand.h>
  16 #include <openssl/rand_drbg.h>
  17 #include <openssl/engine.h>
  18 #include <openssl/params.h>
  19 #include <openssl/core_names.h>
  20 #include "internal/evp_int.h"
  21 #include "internal/provider.h"
  22 #include "evp_locl.h"
  23
  24 int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx)
  25 {
  26     if (ctx == NULL)
  27         return 1;
  28
  29     if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
  30         goto legacy;
  31
  32     if (ctx->provctx != NULL) {
  33         if (ctx->cipher->freectx != NULL)
  34             ctx->cipher->freectx(ctx->provctx);
  35         ctx->provctx = NULL;
  36     }
  37     if (ctx->fetched_cipher != NULL)
  38         EVP_CIPHER_meth_free(ctx->fetched_cipher);
  39     memset(ctx, 0, sizeof(*ctx));
  40
  41     return 1;
  42
  43     /* TODO(3.0): Remove legacy code below */
  44  legacy:
  45
  46     if (ctx->cipher != NULL) {
  47         if (ctx->cipher->cleanup && !ctx->cipher->cleanup(ctx))
  48             return 0;
  49         /* Cleanse cipher context data */
  50         if (ctx->cipher_data && ctx->cipher->ctx_size)
  51             OPENSSL_cleanse(ctx->cipher_data, ctx->cipher->ctx_size);
  52     }
  53     OPENSSL_free(ctx->cipher_data);
  54 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
  55     ENGINE_finish(ctx->engine);
  56 #endif
  57     memset(ctx, 0, sizeof(*ctx));
  58     return 1;
  59 }
  60
  61 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
  62 {
  63     return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
  64 }
  65
  66 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
  67 {
  68     EVP_CIPHER_CTX_reset(ctx);
  69     OPENSSL_free(ctx);
  70 }
  71
  72 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
  73                    const unsigned char *key, const unsigned char *iv, int enc)
  74 {
  75     if (cipher != NULL)
  76         EVP_CIPHER_CTX_reset(ctx);
  77     return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
  78 }
  79
  80 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
  81                       ENGINE *impl, const unsigned char *key,
  82                       const unsigned char *iv, int enc)
  83 {
  84 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
  85     ENGINE *tmpimpl = NULL;
  86 #endif
  87     const EVP_CIPHER *tmpcipher;
  88
  89     /*
  90      * enc == 1 means we are encrypting.
  91      * enc == 0 means we are decrypting.
  92      * enc == -1 means, use the previously initialised value for encrypt/decrypt
  93      */
  94     if (enc == -1) {
  95         enc = ctx->encrypt;
  96     } else {
  97         if (enc)
  98             enc = 1;
  99         ctx->encrypt = enc;
 100     }
 101
 102     if (cipher == NULL && ctx->cipher == NULL) {
 103         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
 104         return 0;
 105     }
 106
 107     /* TODO(3.0): Legacy work around code below. Remove this */
 108
 109 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 110     /*
 111      * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
 112      * this context may already have an ENGINE! Try to avoid releasing the
 113      * previous handle, re-querying for an ENGINE, and having a
 114      * reinitialisation, when it may all be unnecessary.
 115      */
 116     if (ctx->engine && ctx->cipher
 117         && (cipher == NULL || cipher->nid == ctx->cipher->nid))
 118         goto skip_to_init;
 119
 120     if (cipher != NULL && impl == NULL) {
 121          /* Ask if an ENGINE is reserved for this job */
 122         tmpimpl = ENGINE_get_cipher_engine(cipher->nid);
 123     }
 124 #endif
 125
 126     /*
 127      * If there are engines involved then we should use legacy handling for now.
 128      */
 129     if (ctx->engine != NULL
 130 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 131             || tmpimpl != NULL
 132 #endif
 133             || impl != NULL) {
 134         if (ctx->cipher == ctx->fetched_cipher)
 135             ctx->cipher = NULL;
 136         EVP_CIPHER_meth_free(ctx->fetched_cipher);
 137         ctx->fetched_cipher = NULL;
 138         goto legacy;
 139     }
 140
 141     tmpcipher = (cipher == NULL) ? ctx->cipher : cipher;
 142
 143     if (tmpcipher->prov == NULL) {
 144         switch(tmpcipher->nid) {
 145         case NID_aes_256_ecb:
 146         case NID_aes_192_ecb:
 147         case NID_aes_128_ecb:
 148         case NID_aes_256_cbc:
 149         case NID_aes_192_cbc:
 150         case NID_aes_128_cbc:
 151         case NID_aes_256_ofb128:
 152         case NID_aes_192_ofb128:
 153         case NID_aes_128_ofb128:
 154         case NID_aes_256_cfb128:
 155         case NID_aes_192_cfb128:
 156         case NID_aes_128_cfb128:
 157         case NID_aes_256_cfb1:
 158         case NID_aes_192_cfb1:
 159         case NID_aes_128_cfb1:
 160         case NID_aes_256_cfb8:
 161         case NID_aes_192_cfb8:
 162         case NID_aes_128_cfb8:
 163         case NID_aes_256_ctr:
 164         case NID_aes_192_ctr:
 165         case NID_aes_128_ctr:
 166             break;
 167         default:
 168             goto legacy;
 169         }
 170     }
 171
 172     /*
 173      * Ensure a context left lying around from last time is cleared
 174      * (legacy code)
 175      */
 176     if (cipher != NULL && ctx->cipher != NULL) {
 177         OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
 178         ctx->cipher_data = NULL;
 179     }
 180
 181
 182     /* TODO(3.0): Start of non-legacy code below */
 183
 184     /* Ensure a context left lying around from last time is cleared */
 185     if (cipher != NULL && ctx->cipher != NULL) {
 186         unsigned long flags = ctx->flags;
 187
 188         EVP_CIPHER_CTX_reset(ctx);
 189         /* Restore encrypt and flags */
 190         ctx->encrypt = enc;
 191         ctx->flags = flags;
 192     }
 193
 194     if (cipher != NULL)
 195         ctx->cipher = cipher;
 196     else
 197         cipher = ctx->cipher;
 198
 199     if (cipher->prov == NULL) {
 200 #ifdef FIPS_MODE
 201         /* We only do explict fetches inside the FIPS module */
 202         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 203         return 0;
 204 #else
 205         EVP_CIPHER *provciph =
 206             EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
 207
 208         if (provciph == NULL) {
 209             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 210             return 0;
 211         }
 212         cipher = provciph;
 213         EVP_CIPHER_meth_free(ctx->fetched_cipher);
 214         ctx->fetched_cipher = provciph;
 215 #endif
 216     }
 217
 218     ctx->cipher = cipher;
 219     if (ctx->provctx == NULL) {
 220         ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
 221         if (ctx->provctx == NULL) {
 222             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 223             return 0;
 224         }
 225     }
 226
 227     if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
 228         /*
 229          * If this ctx was already set up for no padding then we need to tell
 230          * the new cipher about it.
 231          */
 232         if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
 233             return 0;
 234     }
 235
 236     switch (EVP_CIPHER_mode(ctx->cipher)) {
 237     case EVP_CIPH_CFB_MODE:
 238     case EVP_CIPH_OFB_MODE:
 239     case EVP_CIPH_CBC_MODE:
 240         /* For these modes we remember the original IV for later use */
 241         if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
 242             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 243             return 0;
 244         }
 245         if (iv != NULL)
 246             memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 247     }
 248
 249     if (enc) {
 250         if (ctx->cipher->einit == NULL) {
 251             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 252             return 0;
 253         }
 254
 255         return ctx->cipher->einit(ctx->provctx,
 256                                   key,
 257                                   key == NULL ? 0
 258                                               : EVP_CIPHER_CTX_key_length(ctx),
 259                                   iv,
 260                                   iv == NULL ? 0
 261                                              : EVP_CIPHER_CTX_iv_length(ctx));
 262     }
 263
 264     if (ctx->cipher->dinit == NULL) {
 265         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 266         return 0;
 267     }
 268
 269     return ctx->cipher->dinit(ctx->provctx,
 270                               key,
 271                               key == NULL ? 0
 272                                           : EVP_CIPHER_CTX_key_length(ctx),
 273                               iv,
 274                               iv == NULL ? 0
 275                                          : EVP_CIPHER_CTX_iv_length(ctx));
 276
 277     /* TODO(3.0): Remove legacy code below */
 278  legacy:
 279
 280     if (cipher != NULL) {
 281         /*
 282          * Ensure a context left lying around from last time is cleared (we
 283          * previously attempted to avoid this if the same ENGINE and
 284          * EVP_CIPHER could be used).
 285          */
 286         if (ctx->cipher) {
 287             unsigned long flags = ctx->flags;
 288             EVP_CIPHER_CTX_reset(ctx);
 289             /* Restore encrypt and flags */
 290             ctx->encrypt = enc;
 291             ctx->flags = flags;
 292         }
 293 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 294         if (impl != NULL) {
 295             if (!ENGINE_init(impl)) {
 296                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 297                 return 0;
 298             }
 299         } else {
 300             impl = tmpimpl;
 301         }
 302         if (impl != NULL) {
 303             /* There's an ENGINE for this job ... (apparently) */
 304             const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
 305
 306             if (c == NULL) {
 307                 /*
 308                  * One positive side-effect of US's export control history,
 309                  * is that we should at least be able to avoid using US
 310                  * misspellings of "initialisation"?
 311                  */
 312                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 313                 return 0;
 314             }
 315             /* We'll use the ENGINE's private cipher definition */
 316             cipher = c;
 317             /*
 318              * Store the ENGINE functional reference so we know 'cipher' came
 319              * from an ENGINE and we need to release it when done.
 320              */
 321             ctx->engine = impl;
 322         } else {
 323             ctx->engine = NULL;
 324         }
 325 #endif
 326
 327         ctx->cipher = cipher;
 328         if (ctx->cipher->ctx_size) {
 329             ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
 330             if (ctx->cipher_data == NULL) {
 331                 ctx->cipher = NULL;
 332                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
 333                 return 0;
 334             }
 335         } else {
 336             ctx->cipher_data = NULL;
 337         }
 338         ctx->key_len = cipher->key_len;
 339         /* Preserve wrap enable flag, zero everything else */
 340         ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
 341         if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
 342             if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
 343                 ctx->cipher = NULL;
 344                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 345                 return 0;
 346             }
 347         }
 348     }
 349 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 350  skip_to_init:
 351 #endif
 352     if (ctx->cipher == NULL)
 353         return 0;
 354
 355     /* we assume block size is a power of 2 in *cryptUpdate */
 356     OPENSSL_assert(ctx->cipher->block_size == 1
 357                    || ctx->cipher->block_size == 8
 358                    || ctx->cipher->block_size == 16);
 359
 360     if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
 361         && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
 362         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
 363         return 0;
 364     }
 365
 366     if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
 367         switch (EVP_CIPHER_CTX_mode(ctx)) {
 368
 369         case EVP_CIPH_STREAM_CIPHER:
 370         case EVP_CIPH_ECB_MODE:
 371             break;
 372
 373         case EVP_CIPH_CFB_MODE:
 374         case EVP_CIPH_OFB_MODE:
 375
 376             ctx->num = 0;
 377             /* fall-through */
 378
 379         case EVP_CIPH_CBC_MODE:
 380
 381             OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
 382                            (int)sizeof(ctx->iv));
 383             if (iv)
 384                 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 385             memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
 386             break;
 387
 388         case EVP_CIPH_CTR_MODE:
 389             ctx->num = 0;
 390             /* Don't reuse IV for CTR mode */
 391             if (iv)
 392                 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 393             break;
 394
 395         default:
 396             return 0;
 397         }
 398     }
 399
 400     if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 401         if (!ctx->cipher->init(ctx, key, iv, enc))
 402             return 0;
 403     }
 404     ctx->buf_len = 0;
 405     ctx->final_used = 0;
 406     ctx->block_mask = ctx->cipher->block_size - 1;
 407     return 1;
 408 }
 409
 410 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 411                      const unsigned char *in, int inl)
 412 {
 413     if (ctx->encrypt)
 414         return EVP_EncryptUpdate(ctx, out, outl, in, inl);
 415     else
 416         return EVP_DecryptUpdate(ctx, out, outl, in, inl);
 417 }
 418
 419 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 420 {
 421     if (ctx->encrypt)
 422         return EVP_EncryptFinal_ex(ctx, out, outl);
 423     else
 424         return EVP_DecryptFinal_ex(ctx, out, outl);
 425 }
 426
 427 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 428 {
 429     if (ctx->encrypt)
 430         return EVP_EncryptFinal(ctx, out, outl);
 431     else
 432         return EVP_DecryptFinal(ctx, out, outl);
 433 }
 434
 435 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 436                     const unsigned char *key, const unsigned char *iv)
 437 {
 438     return EVP_CipherInit(ctx, cipher, key, iv, 1);
 439 }
 440
 441 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 442                        ENGINE *impl, const unsigned char *key,
 443                        const unsigned char *iv)
 444 {
 445     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 446 }
 447
 448 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 449                     const unsigned char *key, const unsigned char *iv)
 450 {
 451     return EVP_CipherInit(ctx, cipher, key, iv, 0);
 452 }
 453
 454 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 455                        ENGINE *impl, const unsigned char *key,
 456                        const unsigned char *iv)
 457 {
 458     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 459 }
 460
 461 /*
 462  * According to the letter of standard difference between pointers
 463  * is specified to be valid only within same object. This makes
 464  * it formally challenging to determine if input and output buffers
 465  * are not partially overlapping with standard pointer arithmetic.
 466  */
 467 #ifdef PTRDIFF_T
 468 # undef PTRDIFF_T
 469 #endif
 470 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
 471 /*
 472  * Then we have VMS that distinguishes itself by adhering to
 473  * sizeof(size_t)==4 even in 64-bit builds, which means that
 474  * difference between two pointers might be truncated to 32 bits.
 475  * In the context one can even wonder how comparison for
 476  * equality is implemented. To be on the safe side we adhere to
 477  * PTRDIFF_T even for comparison for equality.
 478  */
 479 # define PTRDIFF_T uint64_t
 480 #else
 481 # define PTRDIFF_T size_t
 482 #endif
 483
 484 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
 485 {
 486     PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
 487     /*
 488      * Check for partially overlapping buffers. [Binary logical
 489      * operations are used instead of boolean to minimize number
 490      * of conditional branches.]
 491      */
 492     int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
 493                                                 (diff > (0 - (PTRDIFF_T)len)));
 494
 495     return overlapped;
 496 }
 497
 498 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
 499                                     unsigned char *out, int *outl,
 500                                     const unsigned char *in, int inl)
 501 {
 502     int i, j, bl, cmpl = inl;
 503
 504     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 505         cmpl = (cmpl + 7) / 8;
 506
 507     bl = ctx->cipher->block_size;
 508
 509     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 510         /* If block size > 1 then the cipher will have to do this check */
 511         if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
 512             EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 513             return 0;
 514         }
 515
 516         i = ctx->cipher->do_cipher(ctx, out, in, inl);
 517         if (i < 0)
 518             return 0;
 519         else
 520             *outl = i;
 521         return 1;
 522     }
 523
 524     if (inl <= 0) {
 525         *outl = 0;
 526         return inl == 0;
 527     }
 528     if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
 529         EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 530         return 0;
 531     }
 532
 533     if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
 534         if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
 535             *outl = inl;
 536             return 1;
 537         } else {
 538             *outl = 0;
 539             return 0;
 540         }
 541     }
 542     i = ctx->buf_len;
 543     OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
 544     if (i != 0) {
 545         if (bl - i > inl) {
 546             memcpy(&(ctx->buf[i]), in, inl);
 547             ctx->buf_len += inl;
 548             *outl = 0;
 549             return 1;
 550         } else {
 551             j = bl - i;
 552             memcpy(&(ctx->buf[i]), in, j);
 553             inl -= j;
 554             in += j;
 555             if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
 556                 return 0;
 557             out += bl;
 558             *outl = bl;
 559         }
 560     } else
 561         *outl = 0;
 562     i = inl & (bl - 1);
 563     inl -= i;
 564     if (inl > 0) {
 565         if (!ctx->cipher->do_cipher(ctx, out, in, inl))
 566             return 0;
 567         *outl += inl;
 568     }
 569
 570     if (i != 0)
 571         memcpy(ctx->buf, &(in[inl]), i);
 572     ctx->buf_len = i;
 573     return 1;
 574 }
 575
 576
 577 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 578                       const unsigned char *in, int inl)
 579 {
 580     int ret;
 581     size_t soutl;
 582     int blocksize;
 583
 584     /* Prevent accidental use of decryption context when encrypting */
 585     if (!ctx->encrypt) {
 586         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
 587         return 0;
 588     }
 589
 590     if (ctx->cipher == NULL) {
 591         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 592         return 0;
 593     }
 594
 595     if (ctx->cipher->prov == NULL)
 596         goto legacy;
 597
 598     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 599
 600     if (ctx->cipher->cupdate == NULL  || blocksize < 1) {
 601         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 602         return 0;
 603     }
 604     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 605                                inl + (blocksize == 1 ? 0 : blocksize), in,
 606                                (size_t)inl);
 607
 608     if (ret) {
 609         if (soutl > INT_MAX) {
 610             EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 611             return 0;
 612         }
 613         *outl = soutl;
 614     }
 615
 616     return ret;
 617
 618     /* TODO(3.0): Remove legacy code below */
 619  legacy:
 620
 621     return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 622 }
 623
 624 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 625 {
 626     int ret;
 627     ret = EVP_EncryptFinal_ex(ctx, out, outl);
 628     return ret;
 629 }
 630
 631 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 632 {
 633     int n, ret;
 634     unsigned int i, b, bl;
 635     size_t soutl;
 636     int blocksize;
 637
 638     /* Prevent accidental use of decryption context when encrypting */
 639     if (!ctx->encrypt) {
 640         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 641         return 0;
 642     }
 643
 644     if (ctx->cipher == NULL) {
 645         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 646         return 0;
 647     }
 648     if (ctx->cipher->prov == NULL)
 649         goto legacy;
 650
 651     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 652
 653     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 654         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 655         return 0;
 656     }
 657
 658     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 659                               blocksize == 1 ? 0 : blocksize);
 660
 661     if (ret) {
 662         if (soutl > INT_MAX) {
 663             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 664             return 0;
 665         }
 666         *outl = soutl;
 667     }
 668
 669     return ret;
 670
 671     /* TODO(3.0): Remove legacy code below */
 672  legacy:
 673
 674     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 675         ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 676         if (ret < 0)
 677             return 0;
 678         else
 679             *outl = ret;
 680         return 1;
 681     }
 682
 683     b = ctx->cipher->block_size;
 684     OPENSSL_assert(b <= sizeof(ctx->buf));
 685     if (b == 1) {
 686         *outl = 0;
 687         return 1;
 688     }
 689     bl = ctx->buf_len;
 690     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 691         if (bl) {
 692             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
 693                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 694             return 0;
 695         }
 696         *outl = 0;
 697         return 1;
 698     }
 699
 700     n = b - bl;
 701     for (i = bl; i < b; i++)
 702         ctx->buf[i] = n;
 703     ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
 704
 705     if (ret)
 706         *outl = b;
 707
 708     return ret;
 709 }
 710
 711 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 712                       const unsigned char *in, int inl)
 713 {
 714     int fix_len, cmpl = inl, ret;
 715     unsigned int b;
 716     size_t soutl;
 717     int blocksize;
 718
 719     /* Prevent accidental use of encryption context when decrypting */
 720     if (ctx->encrypt) {
 721         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
 722         return 0;
 723     }
 724
 725     if (ctx->cipher == NULL) {
 726         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 727         return 0;
 728     }
 729     if (ctx->cipher->prov == NULL)
 730         goto legacy;
 731
 732     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 733
 734     if (ctx->cipher->cupdate == NULL || blocksize < 1) {
 735         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 736         return 0;
 737     }
 738     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 739                                inl + (blocksize == 1 ? 0 : blocksize), in,
 740                                (size_t)inl);
 741
 742     if (ret) {
 743         if (soutl > INT_MAX) {
 744             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 745             return 0;
 746         }
 747         *outl = soutl;
 748     }
 749
 750     return ret;
 751
 752     /* TODO(3.0): Remove legacy code below */
 753  legacy:
 754
 755     b = ctx->cipher->block_size;
 756
 757     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 758         cmpl = (cmpl + 7) / 8;
 759
 760     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 761         if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
 762             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 763             return 0;
 764         }
 765
 766         fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
 767         if (fix_len < 0) {
 768             *outl = 0;
 769             return 0;
 770         } else
 771             *outl = fix_len;
 772         return 1;
 773     }
 774
 775     if (inl <= 0) {
 776         *outl = 0;
 777         return inl == 0;
 778     }
 779
 780     if (ctx->flags & EVP_CIPH_NO_PADDING)
 781         return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 782
 783     OPENSSL_assert(b <= sizeof(ctx->final));
 784
 785     if (ctx->final_used) {
 786         /* see comment about PTRDIFF_T comparison above */
 787         if (((PTRDIFF_T)out == (PTRDIFF_T)in)
 788             || is_partially_overlapping(out, in, b)) {
 789             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 790             return 0;
 791         }
 792         memcpy(out, ctx->final, b);
 793         out += b;
 794         fix_len = 1;
 795     } else
 796         fix_len = 0;
 797
 798     if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
 799         return 0;
 800
 801     /*
 802      * if we have 'decrypted' a multiple of block size, make sure we have a
 803      * copy of this last block
 804      */
 805     if (b > 1 && !ctx->buf_len) {
 806         *outl -= b;
 807         ctx->final_used = 1;
 808         memcpy(ctx->final, &out[*outl], b);
 809     } else
 810         ctx->final_used = 0;
 811
 812     if (fix_len)
 813         *outl += b;
 814
 815     return 1;
 816 }
 817
 818 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 819 {
 820     int ret;
 821     ret = EVP_DecryptFinal_ex(ctx, out, outl);
 822     return ret;
 823 }
 824
 825 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 826 {
 827     int i, n;
 828     unsigned int b;
 829     size_t soutl;
 830     int ret;
 831     int blocksize;
 832
 833     /* Prevent accidental use of encryption context when decrypting */
 834     if (ctx->encrypt) {
 835         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 836         return 0;
 837     }
 838
 839     if (ctx->cipher == NULL) {
 840         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 841         return 0;
 842     }
 843
 844     if (ctx->cipher->prov == NULL)
 845         goto legacy;
 846
 847     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 848
 849     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 850         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 851         return 0;
 852     }
 853
 854     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 855                               blocksize == 1 ? 0 : blocksize);
 856
 857     if (ret) {
 858         if (soutl > INT_MAX) {
 859             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 860             return 0;
 861         }
 862         *outl = soutl;
 863     }
 864
 865     return ret;
 866
 867     /* TODO(3.0): Remove legacy code below */
 868  legacy:
 869
 870     *outl = 0;
 871     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 872         i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 873         if (i < 0)
 874             return 0;
 875         else
 876             *outl = i;
 877         return 1;
 878     }
 879
 880     b = ctx->cipher->block_size;
 881     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 882         if (ctx->buf_len) {
 883             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
 884                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 885             return 0;
 886         }
 887         *outl = 0;
 888         return 1;
 889     }
 890     if (b > 1) {
 891         if (ctx->buf_len || !ctx->final_used) {
 892             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 893             return 0;
 894         }
 895         OPENSSL_assert(b <= sizeof(ctx->final));
 896
 897         /*
 898          * The following assumes that the ciphertext has been authenticated.
 899          * Otherwise it provides a padding oracle.
 900          */
 901         n = ctx->final[b - 1];
 902         if (n == 0 || n > (int)b) {
 903             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
 904             return 0;
 905         }
 906         for (i = 0; i < n; i++) {
 907             if (ctx->final[--b] != n) {
 908                 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
 909                 return 0;
 910             }
 911         }
 912         n = ctx->cipher->block_size - n;
 913         for (i = 0; i < n; i++)
 914             out[i] = ctx->final[i];
 915         *outl = n;
 916     } else
 917         *outl = 0;
 918     return 1;
 919 }
 920
 921 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
 922 {
 923     int ok;
 924     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 925
 926     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &keylen);
 927     ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
 928
 929     if (ok != -2)
 930         return ok;
 931
 932     /* TODO(3.0) legacy code follows */
 933     if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
 934         return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
 935     if (EVP_CIPHER_CTX_key_length(c) == keylen)
 936         return 1;
 937     if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
 938         c->key_len = keylen;
 939         return 1;
 940     }
 941     EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
 942     return 0;
 943 }
 944
 945 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
 946 {
 947     int ok;
 948     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 949
 950     if (pad)
 951         ctx->flags &= ~EVP_CIPH_NO_PADDING;
 952     else
 953         ctx->flags |= EVP_CIPH_NO_PADDING;
 954
 955     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_PADDING, &pad);
 956     ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
 957
 958     return ok != 0;
 959 }
 960
 961 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
 962 {
 963     int ret = -2;                /* Unsupported */
 964     int set_params = 1;
 965     size_t sz;
 966     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 967
 968     if (ctx == NULL || ctx->cipher == NULL) {
 969         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
 970         return 0;
 971     }
 972
 973     if (ctx->cipher->prov == NULL)
 974         goto legacy;
 975
 976     switch (type) {
 977     case EVP_CTRL_SET_KEY_LENGTH:
 978         params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &arg);
 979         break;
 980     case EVP_CTRL_RAND_KEY:      /* Used by DES */
 981     case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
 982     case EVP_CTRL_INIT: /* TODO(3.0) Purely legacy, no provider counterpart */
 983     default:
 984         return -2;      /* Unsupported */
 985     case EVP_CTRL_GET_IV:
 986         set_params = 0;
 987         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
 988                                                       ptr, (size_t)arg);
 989         break;
 990     case EVP_CTRL_AEAD_SET_IVLEN:
 991         if (arg < 0)
 992             return 0;
 993         sz = (size_t)arg;
 994         params[0] =
 995             OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_IVLEN, &sz);
 996         break;
 997     case EVP_CTRL_GCM_SET_IV_FIXED:
 998         params[0] =
 999             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED,
1000                                               ptr, (size_t)arg);
1001         break;
1002     case EVP_CTRL_AEAD_SET_TAG:
1003         params[0] =
1004             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1005                                               ptr, (size_t)arg);
1006         break;
1007     case EVP_CTRL_AEAD_GET_TAG:
1008         set_params = 0;
1009         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1010                                                       ptr, (size_t)arg);
1011         break;
1012     case EVP_CTRL_AEAD_TLS1_AAD:
1013         /* This one does a set and a get - since it returns a padding size */
1014         params[0] =
1015             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1016                                               ptr, (size_t)arg);
1017         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1018         if (ret <= 0)
1019             return ret;
1020         params[0] =
1021             OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1022         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1023         if (ret <= 0)
1024             return 0;
1025         return sz;
1026     }
1027
1028     if (set_params)
1029         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1030     else
1031         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1032     return ret;
1033
1034 /* TODO(3.0): Remove legacy code below */
1035 legacy:
1036     if (ctx->cipher->ctrl == NULL) {
1037         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1038         return 0;
1039     }
1040
1041     ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1042     if (ret == -1) {
1043         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1044                EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1045         return 0;
1046     }
1047     return ret;
1048 }
1049
1050 #if !defined(FIPS_MODE)
1051 /* TODO(3.0): No support for RAND yet in the FIPS module */
1052 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1053 {
1054     int kl;
1055     if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1056         return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1057     kl = EVP_CIPHER_CTX_key_length(ctx);
1058     if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1059         return 0;
1060     return 1;
1061 }
1062 #endif
1063
1064 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1065 {
1066     if ((in == NULL) || (in->cipher == NULL)) {
1067         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1068         return 0;
1069     }
1070
1071     if (in->cipher->prov == NULL)
1072         goto legacy;
1073
1074     if (in->cipher->dupctx == NULL) {
1075         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1076         return 0;
1077     }
1078
1079     EVP_CIPHER_CTX_reset(out);
1080
1081     *out = *in;
1082     out->provctx = NULL;
1083
1084     if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1085         out->fetched_cipher = NULL;
1086         return 0;
1087     }
1088
1089     out->provctx = in->cipher->dupctx(in->provctx);
1090     if (out->provctx == NULL) {
1091         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1092         return 0;
1093     }
1094
1095     return 1;
1096
1097     /* TODO(3.0): Remove legacy code below */
1098  legacy:
1099
1100 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1101     /* Make sure it's safe to copy a cipher context using an ENGINE */
1102     if (in->engine && !ENGINE_init(in->engine)) {
1103         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1104         return 0;
1105     }
1106 #endif
1107
1108     EVP_CIPHER_CTX_reset(out);
1109     memcpy(out, in, sizeof(*out));
1110
1111     if (in->cipher_data && in->cipher->ctx_size) {
1112         out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1113         if (out->cipher_data == NULL) {
1114             out->cipher = NULL;
1115             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1116             return 0;
1117         }
1118         memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1119     }
1120
1121     if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1122         if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1123             out->cipher = NULL;
1124             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1125             return 0;
1126         }
1127     return 1;
1128 }
1129
1130 static void *evp_cipher_from_dispatch(const char *name,
1131                                       const OSSL_DISPATCH *fns,
1132                                       OSSL_PROVIDER *prov)
1133 {
1134     EVP_CIPHER *cipher = NULL;
1135     int fnciphcnt = 0, fnctxcnt = 0;
1136
1137     /*
1138      * The legacy NID is set by EVP_CIPHER_fetch() if the name exists in
1139      * the object database.
1140      */
1141     if ((cipher = EVP_CIPHER_meth_new(0, 0, 0)) == NULL
1142         || (cipher->name = OPENSSL_strdup(name)) == NULL) {
1143         EVP_CIPHER_meth_free(cipher);
1144         EVPerr(0, ERR_R_MALLOC_FAILURE);
1145         return NULL;
1146     }
1147
1148     for (; fns->function_id != 0; fns++) {
1149         switch (fns->function_id) {
1150         case OSSL_FUNC_CIPHER_NEWCTX:
1151             if (cipher->newctx != NULL)
1152                 break;
1153             cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1154             fnctxcnt++;
1155             break;
1156         case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1157             if (cipher->einit != NULL)
1158                 break;
1159             cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1160             fnciphcnt++;
1161             break;
1162         case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1163             if (cipher->dinit != NULL)
1164                 break;
1165             cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1166             fnciphcnt++;
1167             break;
1168         case OSSL_FUNC_CIPHER_UPDATE:
1169             if (cipher->cupdate != NULL)
1170                 break;
1171             cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1172             fnciphcnt++;
1173             break;
1174         case OSSL_FUNC_CIPHER_FINAL:
1175             if (cipher->cfinal != NULL)
1176                 break;
1177             cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1178             fnciphcnt++;
1179             break;
1180         case OSSL_FUNC_CIPHER_CIPHER:
1181             if (cipher->ccipher != NULL)
1182                 break;
1183             cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1184             break;
1185         case OSSL_FUNC_CIPHER_FREECTX:
1186             if (cipher->freectx != NULL)
1187                 break;
1188             cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1189             fnctxcnt++;
1190             break;
1191         case OSSL_FUNC_CIPHER_DUPCTX:
1192             if (cipher->dupctx != NULL)
1193                 break;
1194             cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1195             break;
1196         case OSSL_FUNC_CIPHER_GET_PARAMS:
1197             if (cipher->get_params != NULL)
1198                 break;
1199             cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1200             break;
1201         case OSSL_FUNC_CIPHER_CTX_GET_PARAMS:
1202             if (cipher->ctx_get_params != NULL)
1203                 break;
1204             cipher->ctx_get_params = OSSL_get_OP_cipher_ctx_get_params(fns);
1205             break;
1206         case OSSL_FUNC_CIPHER_CTX_SET_PARAMS:
1207             if (cipher->ctx_set_params != NULL)
1208                 break;
1209             cipher->ctx_set_params = OSSL_get_OP_cipher_ctx_set_params(fns);
1210             break;
1211         }
1212     }
1213     if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1214             || (fnciphcnt == 0 && cipher->ccipher == NULL)
1215             || fnctxcnt != 2) {
1216         /*
1217          * In order to be a consistent set of functions we must have at least
1218          * a complete set of "encrypt" functions, or a complete set of "decrypt"
1219          * functions, or a single "cipher" function. In all cases we need a
1220          * complete set of context management functions, as well as the
1221          * blocksize, iv_length and key_length functions.
1222          */
1223         EVP_CIPHER_meth_free(cipher);
1224         EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1225         return NULL;
1226     }
1227     cipher->prov = prov;
1228     if (prov != NULL)
1229         ossl_provider_up_ref(prov);
1230
1231     return cipher;
1232 }
1233
1234 static int evp_cipher_up_ref(void *cipher)
1235 {
1236     return EVP_CIPHER_up_ref(cipher);
1237 }
1238
1239 static void evp_cipher_free(void *cipher)
1240 {
1241     EVP_CIPHER_meth_free(cipher);
1242 }
1243
1244 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1245                              const char *properties)
1246 {
1247     EVP_CIPHER *cipher =
1248         evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1249                           evp_cipher_from_dispatch, evp_cipher_up_ref,
1250                           evp_cipher_free);
1251
1252 #ifndef FIPS_MODE
1253     /* TODO(3.x) get rid of the need for legacy NIDs */
1254     if (cipher != NULL) {
1255         /*
1256          * FIPS module note: since internal fetches will be entirely
1257          * provider based, we know that none of its code depends on legacy
1258          * NIDs or any functionality that use them.
1259          */
1260         cipher->nid = OBJ_sn2nid(algorithm);
1261     }
1262 #endif
1263
1264     return cipher;
1265 }