crypto/evp/evp_enc.c

   1 /*
   2  * Copyright 1995-2019 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         case NID_aes_256_gcm:
 167         case NID_aes_192_gcm:
 168         case NID_aes_128_gcm:
 169         case NID_aria_256_gcm:
 170         case NID_aria_192_gcm:
 171         case NID_aria_128_gcm:
 172         case NID_aes_256_ccm:
 173         case NID_aes_192_ccm:
 174         case NID_aes_128_ccm:
 175         case NID_aria_256_ccm:
 176         case NID_aria_192_ccm:
 177         case NID_aria_128_ccm:
 178         case NID_aria_256_ecb:
 179         case NID_aria_192_ecb:
 180         case NID_aria_128_ecb:
 181         case NID_aria_256_cbc:
 182         case NID_aria_192_cbc:
 183         case NID_aria_128_cbc:
 184         case NID_aria_256_ofb128:
 185         case NID_aria_192_ofb128:
 186         case NID_aria_128_ofb128:
 187         case NID_aria_256_cfb128:
 188         case NID_aria_192_cfb128:
 189         case NID_aria_128_cfb128:
 190         case NID_aria_256_cfb1:
 191         case NID_aria_192_cfb1:
 192         case NID_aria_128_cfb1:
 193         case NID_aria_256_cfb8:
 194         case NID_aria_192_cfb8:
 195         case NID_aria_128_cfb8:
 196         case NID_aria_256_ctr:
 197         case NID_aria_192_ctr:
 198         case NID_aria_128_ctr:
 199         case NID_camellia_256_ecb:
 200         case NID_camellia_192_ecb:
 201         case NID_camellia_128_ecb:
 202         case NID_camellia_256_cbc:
 203         case NID_camellia_192_cbc:
 204         case NID_camellia_128_cbc:
 205         case NID_camellia_256_ofb128:
 206         case NID_camellia_192_ofb128:
 207         case NID_camellia_128_ofb128:
 208         case NID_camellia_256_cfb128:
 209         case NID_camellia_192_cfb128:
 210         case NID_camellia_128_cfb128:
 211         case NID_camellia_256_cfb1:
 212         case NID_camellia_192_cfb1:
 213         case NID_camellia_128_cfb1:
 214         case NID_camellia_256_cfb8:
 215         case NID_camellia_192_cfb8:
 216         case NID_camellia_128_cfb8:
 217         case NID_camellia_256_ctr:
 218         case NID_camellia_192_ctr:
 219         case NID_camellia_128_ctr:
 220         case NID_des_ede3_cbc:
 221         case NID_des_ede3_ecb:
 222         case NID_des_ede3_ofb64:
 223         case NID_des_ede3_cfb64:
 224         case NID_des_ede3_cfb8:
 225         case NID_des_ede3_cfb1:
 226         case NID_des_ede_cbc:
 227         case NID_des_ede_ecb:
 228         case NID_des_ede_ofb64:
 229         case NID_des_ede_cfb64:
 230         case NID_desx_cbc:
 231         case NID_id_smime_alg_CMS3DESwrap:
 232             break;
 233         default:
 234             goto legacy;
 235         }
 236     }
 237
 238     /*
 239      * Ensure a context left lying around from last time is cleared
 240      * (legacy code)
 241      */
 242     if (cipher != NULL && ctx->cipher != NULL) {
 243         OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
 244         ctx->cipher_data = NULL;
 245     }
 246
 247
 248     /* TODO(3.0): Start of non-legacy code below */
 249
 250     /* Ensure a context left lying around from last time is cleared */
 251     if (cipher != NULL && ctx->cipher != NULL) {
 252         unsigned long flags = ctx->flags;
 253
 254         EVP_CIPHER_CTX_reset(ctx);
 255         /* Restore encrypt and flags */
 256         ctx->encrypt = enc;
 257         ctx->flags = flags;
 258     }
 259
 260     if (cipher == NULL)
 261         cipher = ctx->cipher;
 262
 263     if (cipher->prov == NULL) {
 264 #ifdef FIPS_MODE
 265         /* We only do explict fetches inside the FIPS module */
 266         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 267         return 0;
 268 #else
 269         EVP_CIPHER *provciph =
 270             EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
 271
 272         if (provciph == NULL) {
 273             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 274             return 0;
 275         }
 276         cipher = provciph;
 277         EVP_CIPHER_meth_free(ctx->fetched_cipher);
 278         ctx->fetched_cipher = provciph;
 279 #endif
 280     }
 281
 282     ctx->cipher = cipher;
 283     if (ctx->provctx == NULL) {
 284         ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
 285         if (ctx->provctx == NULL) {
 286             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 287             return 0;
 288         }
 289     }
 290
 291     if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
 292         /*
 293          * If this ctx was already set up for no padding then we need to tell
 294          * the new cipher about it.
 295          */
 296         if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
 297             return 0;
 298     }
 299
 300     switch (EVP_CIPHER_mode(ctx->cipher)) {
 301     case EVP_CIPH_CFB_MODE:
 302     case EVP_CIPH_OFB_MODE:
 303     case EVP_CIPH_CBC_MODE:
 304         /* For these modes we remember the original IV for later use */
 305         if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
 306             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 307             return 0;
 308         }
 309         if (iv != NULL)
 310             memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 311     }
 312
 313     if (enc) {
 314         if (ctx->cipher->einit == NULL) {
 315             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 316             return 0;
 317         }
 318
 319         return ctx->cipher->einit(ctx->provctx,
 320                                   key,
 321                                   key == NULL ? 0
 322                                               : EVP_CIPHER_CTX_key_length(ctx),
 323                                   iv,
 324                                   iv == NULL ? 0
 325                                              : EVP_CIPHER_CTX_iv_length(ctx));
 326     }
 327
 328     if (ctx->cipher->dinit == NULL) {
 329         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 330         return 0;
 331     }
 332
 333     return ctx->cipher->dinit(ctx->provctx,
 334                               key,
 335                               key == NULL ? 0
 336                                           : EVP_CIPHER_CTX_key_length(ctx),
 337                               iv,
 338                               iv == NULL ? 0
 339                                          : EVP_CIPHER_CTX_iv_length(ctx));
 340
 341     /* TODO(3.0): Remove legacy code below */
 342  legacy:
 343
 344     if (cipher != NULL) {
 345         /*
 346          * Ensure a context left lying around from last time is cleared (we
 347          * previously attempted to avoid this if the same ENGINE and
 348          * EVP_CIPHER could be used).
 349          */
 350         if (ctx->cipher) {
 351             unsigned long flags = ctx->flags;
 352             EVP_CIPHER_CTX_reset(ctx);
 353             /* Restore encrypt and flags */
 354             ctx->encrypt = enc;
 355             ctx->flags = flags;
 356         }
 357 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 358         if (impl != NULL) {
 359             if (!ENGINE_init(impl)) {
 360                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 361                 return 0;
 362             }
 363         } else {
 364             impl = tmpimpl;
 365         }
 366         if (impl != NULL) {
 367             /* There's an ENGINE for this job ... (apparently) */
 368             const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
 369
 370             if (c == NULL) {
 371                 /*
 372                  * One positive side-effect of US's export control history,
 373                  * is that we should at least be able to avoid using US
 374                  * misspellings of "initialisation"?
 375                  */
 376                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 377                 return 0;
 378             }
 379             /* We'll use the ENGINE's private cipher definition */
 380             cipher = c;
 381             /*
 382              * Store the ENGINE functional reference so we know 'cipher' came
 383              * from an ENGINE and we need to release it when done.
 384              */
 385             ctx->engine = impl;
 386         } else {
 387             ctx->engine = NULL;
 388         }
 389 #endif
 390
 391         ctx->cipher = cipher;
 392         if (ctx->cipher->ctx_size) {
 393             ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
 394             if (ctx->cipher_data == NULL) {
 395                 ctx->cipher = NULL;
 396                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
 397                 return 0;
 398             }
 399         } else {
 400             ctx->cipher_data = NULL;
 401         }
 402         ctx->key_len = cipher->key_len;
 403         /* Preserve wrap enable flag, zero everything else */
 404         ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
 405         if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
 406             if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
 407                 ctx->cipher = NULL;
 408                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 409                 return 0;
 410             }
 411         }
 412     }
 413 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 414  skip_to_init:
 415 #endif
 416     if (ctx->cipher == NULL)
 417         return 0;
 418
 419     /* we assume block size is a power of 2 in *cryptUpdate */
 420     OPENSSL_assert(ctx->cipher->block_size == 1
 421                    || ctx->cipher->block_size == 8
 422                    || ctx->cipher->block_size == 16);
 423
 424     if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
 425         && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
 426         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
 427         return 0;
 428     }
 429
 430     if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
 431         switch (EVP_CIPHER_CTX_mode(ctx)) {
 432
 433         case EVP_CIPH_STREAM_CIPHER:
 434         case EVP_CIPH_ECB_MODE:
 435             break;
 436
 437         case EVP_CIPH_CFB_MODE:
 438         case EVP_CIPH_OFB_MODE:
 439
 440             ctx->num = 0;
 441             /* fall-through */
 442
 443         case EVP_CIPH_CBC_MODE:
 444
 445             OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
 446                            (int)sizeof(ctx->iv));
 447             if (iv)
 448                 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 449             memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
 450             break;
 451
 452         case EVP_CIPH_CTR_MODE:
 453             ctx->num = 0;
 454             /* Don't reuse IV for CTR mode */
 455             if (iv)
 456                 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 457             break;
 458
 459         default:
 460             return 0;
 461         }
 462     }
 463
 464     if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 465         if (!ctx->cipher->init(ctx, key, iv, enc))
 466             return 0;
 467     }
 468     ctx->buf_len = 0;
 469     ctx->final_used = 0;
 470     ctx->block_mask = ctx->cipher->block_size - 1;
 471     return 1;
 472 }
 473
 474 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 475                      const unsigned char *in, int inl)
 476 {
 477     if (ctx->encrypt)
 478         return EVP_EncryptUpdate(ctx, out, outl, in, inl);
 479     else
 480         return EVP_DecryptUpdate(ctx, out, outl, in, inl);
 481 }
 482
 483 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 484 {
 485     if (ctx->encrypt)
 486         return EVP_EncryptFinal_ex(ctx, out, outl);
 487     else
 488         return EVP_DecryptFinal_ex(ctx, out, outl);
 489 }
 490
 491 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 492 {
 493     if (ctx->encrypt)
 494         return EVP_EncryptFinal(ctx, out, outl);
 495     else
 496         return EVP_DecryptFinal(ctx, out, outl);
 497 }
 498
 499 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 500                     const unsigned char *key, const unsigned char *iv)
 501 {
 502     return EVP_CipherInit(ctx, cipher, key, iv, 1);
 503 }
 504
 505 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 506                        ENGINE *impl, const unsigned char *key,
 507                        const unsigned char *iv)
 508 {
 509     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 510 }
 511
 512 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 513                     const unsigned char *key, const unsigned char *iv)
 514 {
 515     return EVP_CipherInit(ctx, cipher, key, iv, 0);
 516 }
 517
 518 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 519                        ENGINE *impl, const unsigned char *key,
 520                        const unsigned char *iv)
 521 {
 522     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 523 }
 524
 525 /*
 526  * According to the letter of standard difference between pointers
 527  * is specified to be valid only within same object. This makes
 528  * it formally challenging to determine if input and output buffers
 529  * are not partially overlapping with standard pointer arithmetic.
 530  */
 531 #ifdef PTRDIFF_T
 532 # undef PTRDIFF_T
 533 #endif
 534 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
 535 /*
 536  * Then we have VMS that distinguishes itself by adhering to
 537  * sizeof(size_t)==4 even in 64-bit builds, which means that
 538  * difference between two pointers might be truncated to 32 bits.
 539  * In the context one can even wonder how comparison for
 540  * equality is implemented. To be on the safe side we adhere to
 541  * PTRDIFF_T even for comparison for equality.
 542  */
 543 # define PTRDIFF_T uint64_t
 544 #else
 545 # define PTRDIFF_T size_t
 546 #endif
 547
 548 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
 549 {
 550     PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
 551     /*
 552      * Check for partially overlapping buffers. [Binary logical
 553      * operations are used instead of boolean to minimize number
 554      * of conditional branches.]
 555      */
 556     int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
 557                                                 (diff > (0 - (PTRDIFF_T)len)));
 558
 559     return overlapped;
 560 }
 561
 562 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
 563                                     unsigned char *out, int *outl,
 564                                     const unsigned char *in, int inl)
 565 {
 566     int i, j, bl, cmpl = inl;
 567
 568     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 569         cmpl = (cmpl + 7) / 8;
 570
 571     bl = ctx->cipher->block_size;
 572
 573     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 574         /* If block size > 1 then the cipher will have to do this check */
 575         if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
 576             EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 577             return 0;
 578         }
 579
 580         i = ctx->cipher->do_cipher(ctx, out, in, inl);
 581         if (i < 0)
 582             return 0;
 583         else
 584             *outl = i;
 585         return 1;
 586     }
 587
 588     if (inl <= 0) {
 589         *outl = 0;
 590         return inl == 0;
 591     }
 592     if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
 593         EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 594         return 0;
 595     }
 596
 597     if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
 598         if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
 599             *outl = inl;
 600             return 1;
 601         } else {
 602             *outl = 0;
 603             return 0;
 604         }
 605     }
 606     i = ctx->buf_len;
 607     OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
 608     if (i != 0) {
 609         if (bl - i > inl) {
 610             memcpy(&(ctx->buf[i]), in, inl);
 611             ctx->buf_len += inl;
 612             *outl = 0;
 613             return 1;
 614         } else {
 615             j = bl - i;
 616             memcpy(&(ctx->buf[i]), in, j);
 617             inl -= j;
 618             in += j;
 619             if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
 620                 return 0;
 621             out += bl;
 622             *outl = bl;
 623         }
 624     } else
 625         *outl = 0;
 626     i = inl & (bl - 1);
 627     inl -= i;
 628     if (inl > 0) {
 629         if (!ctx->cipher->do_cipher(ctx, out, in, inl))
 630             return 0;
 631         *outl += inl;
 632     }
 633
 634     if (i != 0)
 635         memcpy(ctx->buf, &(in[inl]), i);
 636     ctx->buf_len = i;
 637     return 1;
 638 }
 639
 640
 641 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 642                       const unsigned char *in, int inl)
 643 {
 644     int ret;
 645     size_t soutl;
 646     int blocksize;
 647
 648     /* Prevent accidental use of decryption context when encrypting */
 649     if (!ctx->encrypt) {
 650         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
 651         return 0;
 652     }
 653
 654     if (ctx->cipher == NULL) {
 655         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 656         return 0;
 657     }
 658
 659     if (ctx->cipher->prov == NULL)
 660         goto legacy;
 661
 662     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 663
 664     if (ctx->cipher->cupdate == NULL  || blocksize < 1) {
 665         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 666         return 0;
 667     }
 668     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 669                                inl + (blocksize == 1 ? 0 : blocksize), in,
 670                                (size_t)inl);
 671
 672     if (ret) {
 673         if (soutl > INT_MAX) {
 674             EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 675             return 0;
 676         }
 677         *outl = soutl;
 678     }
 679
 680     return ret;
 681
 682     /* TODO(3.0): Remove legacy code below */
 683  legacy:
 684
 685     return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 686 }
 687
 688 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 689 {
 690     int ret;
 691     ret = EVP_EncryptFinal_ex(ctx, out, outl);
 692     return ret;
 693 }
 694
 695 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 696 {
 697     int n, ret;
 698     unsigned int i, b, bl;
 699     size_t soutl;
 700     int blocksize;
 701
 702     /* Prevent accidental use of decryption context when encrypting */
 703     if (!ctx->encrypt) {
 704         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 705         return 0;
 706     }
 707
 708     if (ctx->cipher == NULL) {
 709         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 710         return 0;
 711     }
 712     if (ctx->cipher->prov == NULL)
 713         goto legacy;
 714
 715     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 716
 717     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 718         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 719         return 0;
 720     }
 721
 722     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 723                               blocksize == 1 ? 0 : blocksize);
 724
 725     if (ret) {
 726         if (soutl > INT_MAX) {
 727             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 728             return 0;
 729         }
 730         *outl = soutl;
 731     }
 732
 733     return ret;
 734
 735     /* TODO(3.0): Remove legacy code below */
 736  legacy:
 737
 738     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 739         ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 740         if (ret < 0)
 741             return 0;
 742         else
 743             *outl = ret;
 744         return 1;
 745     }
 746
 747     b = ctx->cipher->block_size;
 748     OPENSSL_assert(b <= sizeof(ctx->buf));
 749     if (b == 1) {
 750         *outl = 0;
 751         return 1;
 752     }
 753     bl = ctx->buf_len;
 754     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 755         if (bl) {
 756             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
 757                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 758             return 0;
 759         }
 760         *outl = 0;
 761         return 1;
 762     }
 763
 764     n = b - bl;
 765     for (i = bl; i < b; i++)
 766         ctx->buf[i] = n;
 767     ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
 768
 769     if (ret)
 770         *outl = b;
 771
 772     return ret;
 773 }
 774
 775 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 776                       const unsigned char *in, int inl)
 777 {
 778     int fix_len, cmpl = inl, ret;
 779     unsigned int b;
 780     size_t soutl;
 781     int blocksize;
 782
 783     /* Prevent accidental use of encryption context when decrypting */
 784     if (ctx->encrypt) {
 785         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
 786         return 0;
 787     }
 788
 789     if (ctx->cipher == NULL) {
 790         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 791         return 0;
 792     }
 793     if (ctx->cipher->prov == NULL)
 794         goto legacy;
 795
 796     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 797
 798     if (ctx->cipher->cupdate == NULL || blocksize < 1) {
 799         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 800         return 0;
 801     }
 802     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 803                                inl + (blocksize == 1 ? 0 : blocksize), in,
 804                                (size_t)inl);
 805
 806     if (ret) {
 807         if (soutl > INT_MAX) {
 808             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 809             return 0;
 810         }
 811         *outl = soutl;
 812     }
 813
 814     return ret;
 815
 816     /* TODO(3.0): Remove legacy code below */
 817  legacy:
 818
 819     b = ctx->cipher->block_size;
 820
 821     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 822         cmpl = (cmpl + 7) / 8;
 823
 824     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 825         if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
 826             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 827             return 0;
 828         }
 829
 830         fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
 831         if (fix_len < 0) {
 832             *outl = 0;
 833             return 0;
 834         } else
 835             *outl = fix_len;
 836         return 1;
 837     }
 838
 839     if (inl <= 0) {
 840         *outl = 0;
 841         return inl == 0;
 842     }
 843
 844     if (ctx->flags & EVP_CIPH_NO_PADDING)
 845         return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 846
 847     OPENSSL_assert(b <= sizeof(ctx->final));
 848
 849     if (ctx->final_used) {
 850         /* see comment about PTRDIFF_T comparison above */
 851         if (((PTRDIFF_T)out == (PTRDIFF_T)in)
 852             || is_partially_overlapping(out, in, b)) {
 853             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 854             return 0;
 855         }
 856         memcpy(out, ctx->final, b);
 857         out += b;
 858         fix_len = 1;
 859     } else
 860         fix_len = 0;
 861
 862     if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
 863         return 0;
 864
 865     /*
 866      * if we have 'decrypted' a multiple of block size, make sure we have a
 867      * copy of this last block
 868      */
 869     if (b > 1 && !ctx->buf_len) {
 870         *outl -= b;
 871         ctx->final_used = 1;
 872         memcpy(ctx->final, &out[*outl], b);
 873     } else
 874         ctx->final_used = 0;
 875
 876     if (fix_len)
 877         *outl += b;
 878
 879     return 1;
 880 }
 881
 882 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 883 {
 884     int ret;
 885     ret = EVP_DecryptFinal_ex(ctx, out, outl);
 886     return ret;
 887 }
 888
 889 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 890 {
 891     int i, n;
 892     unsigned int b;
 893     size_t soutl;
 894     int ret;
 895     int blocksize;
 896
 897     /* Prevent accidental use of encryption context when decrypting */
 898     if (ctx->encrypt) {
 899         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 900         return 0;
 901     }
 902
 903     if (ctx->cipher == NULL) {
 904         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 905         return 0;
 906     }
 907
 908     if (ctx->cipher->prov == NULL)
 909         goto legacy;
 910
 911     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 912
 913     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 914         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 915         return 0;
 916     }
 917
 918     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 919                               blocksize == 1 ? 0 : blocksize);
 920
 921     if (ret) {
 922         if (soutl > INT_MAX) {
 923             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 924             return 0;
 925         }
 926         *outl = soutl;
 927     }
 928
 929     return ret;
 930
 931     /* TODO(3.0): Remove legacy code below */
 932  legacy:
 933
 934     *outl = 0;
 935     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 936         i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 937         if (i < 0)
 938             return 0;
 939         else
 940             *outl = i;
 941         return 1;
 942     }
 943
 944     b = ctx->cipher->block_size;
 945     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 946         if (ctx->buf_len) {
 947             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
 948                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 949             return 0;
 950         }
 951         *outl = 0;
 952         return 1;
 953     }
 954     if (b > 1) {
 955         if (ctx->buf_len || !ctx->final_used) {
 956             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 957             return 0;
 958         }
 959         OPENSSL_assert(b <= sizeof(ctx->final));
 960
 961         /*
 962          * The following assumes that the ciphertext has been authenticated.
 963          * Otherwise it provides a padding oracle.
 964          */
 965         n = ctx->final[b - 1];
 966         if (n == 0 || n > (int)b) {
 967             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
 968             return 0;
 969         }
 970         for (i = 0; i < n; i++) {
 971             if (ctx->final[--b] != n) {
 972                 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
 973                 return 0;
 974             }
 975         }
 976         n = ctx->cipher->block_size - n;
 977         for (i = 0; i < n; i++)
 978             out[i] = ctx->final[i];
 979         *outl = n;
 980     } else
 981         *outl = 0;
 982     return 1;
 983 }
 984
 985 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
 986 {
 987     int ok;
 988     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 989
 990     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &keylen);
 991     ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
 992
 993     if (ok != EVP_CTRL_RET_UNSUPPORTED)
 994         return ok;
 995
 996     /* TODO(3.0) legacy code follows */
 997     if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
 998         return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
 999     if (EVP_CIPHER_CTX_key_length(c) == keylen)
1000         return 1;
1001     if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
1002         c->key_len = keylen;
1003         return 1;
1004     }
1005     EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
1006     return 0;
1007 }
1008
1009 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
1010 {
1011     int ok;
1012     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1013
1014     if (pad)
1015         ctx->flags &= ~EVP_CIPH_NO_PADDING;
1016     else
1017         ctx->flags |= EVP_CIPH_NO_PADDING;
1018
1019     params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_PADDING, &pad);
1020     ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1021
1022     return ok != 0;
1023 }
1024
1025 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
1026 {
1027     int ret = EVP_CTRL_RET_UNSUPPORTED;
1028     int set_params = 1;
1029     size_t sz;
1030     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1031
1032     if (ctx == NULL || ctx->cipher == NULL) {
1033         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
1034         return 0;
1035     }
1036
1037     if (ctx->cipher->prov == NULL)
1038         goto legacy;
1039
1040     switch (type) {
1041     case EVP_CTRL_SET_KEY_LENGTH:
1042         params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &arg);
1043         break;
1044     case EVP_CTRL_RAND_KEY:      /* Used by DES */
1045         set_params = 0;
1046         params[0] =
1047             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
1048                                               ptr, (size_t)arg);
1049         break;
1050
1051     case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
1052     case EVP_CTRL_INIT: /* TODO(3.0) Purely legacy, no provider counterpart */
1053     default:
1054         return EVP_CTRL_RET_UNSUPPORTED;
1055     case EVP_CTRL_GET_IV:
1056         set_params = 0;
1057         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
1058                                                       ptr, (size_t)arg);
1059         break;
1060     case EVP_CTRL_AEAD_SET_IVLEN:
1061         if (arg < 0)
1062             return 0;
1063         sz = (size_t)arg;
1064         params[0] =
1065             OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_IVLEN, &sz);
1066         break;
1067     case EVP_CTRL_GCM_SET_IV_FIXED:
1068         params[0] =
1069             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED,
1070                                               ptr, (size_t)arg);
1071         break;
1072     case EVP_CTRL_AEAD_SET_TAG:
1073         params[0] =
1074             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1075                                               ptr, (size_t)arg);
1076         break;
1077     case EVP_CTRL_AEAD_GET_TAG:
1078         set_params = 0;
1079         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1080                                                       ptr, (size_t)arg);
1081         break;
1082     case EVP_CTRL_AEAD_TLS1_AAD:
1083         /* This one does a set and a get - since it returns a padding size */
1084         params[0] =
1085             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1086                                               ptr, (size_t)arg);
1087         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1088         if (ret <= 0)
1089             return ret;
1090         params[0] =
1091             OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1092         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1093         if (ret <= 0)
1094             return 0;
1095         return sz;
1096     }
1097
1098     if (set_params)
1099         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1100     else
1101         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1102     return ret;
1103
1104 /* TODO(3.0): Remove legacy code below */
1105 legacy:
1106     if (ctx->cipher->ctrl == NULL) {
1107         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1108         return 0;
1109     }
1110
1111     ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1112     if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1113         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1114                EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1115         return 0;
1116     }
1117     return ret;
1118 }
1119
1120 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1121 {
1122     if (cipher != NULL && cipher->get_params != NULL)
1123         return cipher->get_params(params);
1124     return 0;
1125 }
1126
1127 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1128 {
1129     if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1130         return ctx->cipher->set_ctx_params(ctx->provctx, params);
1131     return 0;
1132 }
1133
1134 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1135 {
1136     if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1137         return ctx->cipher->get_ctx_params(ctx->provctx, params);
1138     return 0;
1139 }
1140
1141 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1142 {
1143     if (cipher != NULL && cipher->gettable_params != NULL)
1144         return cipher->gettable_params();
1145     return NULL;
1146 }
1147
1148 const OSSL_PARAM *EVP_CIPHER_CTX_settable_params(const EVP_CIPHER *cipher)
1149 {
1150     if (cipher != NULL && cipher->settable_ctx_params != NULL)
1151         return cipher->settable_ctx_params();
1152     return NULL;
1153 }
1154
1155 const OSSL_PARAM *EVP_CIPHER_CTX_gettable_params(const EVP_CIPHER *cipher)
1156 {
1157     if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1158         return cipher->gettable_ctx_params();
1159     return NULL;
1160 }
1161
1162 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1163 {
1164     if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1165         return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1166
1167 #ifdef FIPS_MODE
1168     return 0;
1169 #else
1170     {
1171         int kl;
1172
1173         kl = EVP_CIPHER_CTX_key_length(ctx);
1174         if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1175             return 0;
1176         return 1;
1177     }
1178 #endif /* FIPS_MODE */
1179 }
1180
1181 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1182 {
1183     if ((in == NULL) || (in->cipher == NULL)) {
1184         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1185         return 0;
1186     }
1187
1188     if (in->cipher->prov == NULL)
1189         goto legacy;
1190
1191     if (in->cipher->dupctx == NULL) {
1192         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1193         return 0;
1194     }
1195
1196     EVP_CIPHER_CTX_reset(out);
1197
1198     *out = *in;
1199     out->provctx = NULL;
1200
1201     if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1202         out->fetched_cipher = NULL;
1203         return 0;
1204     }
1205
1206     out->provctx = in->cipher->dupctx(in->provctx);
1207     if (out->provctx == NULL) {
1208         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1209         return 0;
1210     }
1211
1212     return 1;
1213
1214     /* TODO(3.0): Remove legacy code below */
1215  legacy:
1216
1217 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1218     /* Make sure it's safe to copy a cipher context using an ENGINE */
1219     if (in->engine && !ENGINE_init(in->engine)) {
1220         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1221         return 0;
1222     }
1223 #endif
1224
1225     EVP_CIPHER_CTX_reset(out);
1226     memcpy(out, in, sizeof(*out));
1227
1228     if (in->cipher_data && in->cipher->ctx_size) {
1229         out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1230         if (out->cipher_data == NULL) {
1231             out->cipher = NULL;
1232             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1233             return 0;
1234         }
1235         memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1236     }
1237
1238     if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1239         if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1240             out->cipher = NULL;
1241             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1242             return 0;
1243         }
1244     return 1;
1245 }
1246
1247 static void *evp_cipher_from_dispatch(const char *name,
1248                                       const OSSL_DISPATCH *fns,
1249                                       OSSL_PROVIDER *prov,
1250                                       void *unused)
1251 {
1252     EVP_CIPHER *cipher = NULL;
1253     int fnciphcnt = 0, fnctxcnt = 0;
1254
1255     if ((cipher = EVP_CIPHER_meth_new(0, 0, 0)) == NULL
1256         || (cipher->name = OPENSSL_strdup(name)) == NULL) {
1257         EVP_CIPHER_meth_free(cipher);
1258         EVPerr(0, ERR_R_MALLOC_FAILURE);
1259         return NULL;
1260     }
1261
1262 #ifndef FIPS_MODE
1263     /*
1264      * FIPS module note: since internal fetches will be entirely
1265      * provider based, we know that none of its code depends on legacy
1266      * NIDs or any functionality that use them.
1267      *
1268      * TODO(3.x) get rid of the need for legacy NIDs
1269      */
1270     cipher->nid = OBJ_sn2nid(name);
1271 #endif
1272
1273     for (; fns->function_id != 0; fns++) {
1274         switch (fns->function_id) {
1275         case OSSL_FUNC_CIPHER_NEWCTX:
1276             if (cipher->newctx != NULL)
1277                 break;
1278             cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1279             fnctxcnt++;
1280             break;
1281         case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1282             if (cipher->einit != NULL)
1283                 break;
1284             cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1285             fnciphcnt++;
1286             break;
1287         case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1288             if (cipher->dinit != NULL)
1289                 break;
1290             cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1291             fnciphcnt++;
1292             break;
1293         case OSSL_FUNC_CIPHER_UPDATE:
1294             if (cipher->cupdate != NULL)
1295                 break;
1296             cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1297             fnciphcnt++;
1298             break;
1299         case OSSL_FUNC_CIPHER_FINAL:
1300             if (cipher->cfinal != NULL)
1301                 break;
1302             cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1303             fnciphcnt++;
1304             break;
1305         case OSSL_FUNC_CIPHER_CIPHER:
1306             if (cipher->ccipher != NULL)
1307                 break;
1308             cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1309             break;
1310         case OSSL_FUNC_CIPHER_FREECTX:
1311             if (cipher->freectx != NULL)
1312                 break;
1313             cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1314             fnctxcnt++;
1315             break;
1316         case OSSL_FUNC_CIPHER_DUPCTX:
1317             if (cipher->dupctx != NULL)
1318                 break;
1319             cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1320             break;
1321         case OSSL_FUNC_CIPHER_GET_PARAMS:
1322             if (cipher->get_params != NULL)
1323                 break;
1324             cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1325             break;
1326         case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1327             if (cipher->get_ctx_params != NULL)
1328                 break;
1329             cipher->get_ctx_params = OSSL_get_OP_cipher_get_ctx_params(fns);
1330             break;
1331         case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1332             if (cipher->set_ctx_params != NULL)
1333                 break;
1334             cipher->set_ctx_params = OSSL_get_OP_cipher_set_ctx_params(fns);
1335             break;
1336         case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1337             if (cipher->gettable_params != NULL)
1338                 break;
1339             cipher->gettable_params = OSSL_get_OP_cipher_gettable_params(fns);
1340             break;
1341         case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1342             if (cipher->gettable_ctx_params != NULL)
1343                 break;
1344             cipher->gettable_ctx_params =
1345                 OSSL_get_OP_cipher_gettable_ctx_params(fns);
1346             break;
1347         case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1348             if (cipher->settable_ctx_params != NULL)
1349                 break;
1350             cipher->settable_ctx_params =
1351                 OSSL_get_OP_cipher_settable_ctx_params(fns);
1352             break;
1353         }
1354     }
1355     if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1356             || (fnciphcnt == 0 && cipher->ccipher == NULL)
1357             || fnctxcnt != 2) {
1358         /*
1359          * In order to be a consistent set of functions we must have at least
1360          * a complete set of "encrypt" functions, or a complete set of "decrypt"
1361          * functions, or a single "cipher" function. In all cases we need both
1362          * the "newctx" and "freectx" functions.
1363          */
1364         EVP_CIPHER_meth_free(cipher);
1365         EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1366         return NULL;
1367     }
1368     cipher->prov = prov;
1369     if (prov != NULL)
1370         ossl_provider_up_ref(prov);
1371
1372     return cipher;
1373 }
1374
1375 static int evp_cipher_up_ref(void *cipher)
1376 {
1377     return EVP_CIPHER_up_ref(cipher);
1378 }
1379
1380 static void evp_cipher_free(void *cipher)
1381 {
1382     EVP_CIPHER_meth_free(cipher);
1383 }
1384
1385 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1386                              const char *properties)
1387 {
1388     EVP_CIPHER *cipher =
1389         evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1390                           evp_cipher_from_dispatch, NULL, evp_cipher_up_ref,
1391                           evp_cipher_free);
1392
1393     return cipher;
1394 }
1395
1396 void EVP_CIPHER_do_all_ex(OPENSSL_CTX *libctx,
1397                           void (*fn)(EVP_CIPHER *mac, void *arg),
1398                           void *arg)
1399 {
1400     evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1401                        (void (*)(void *, void *))fn, arg,
1402                        evp_cipher_from_dispatch, NULL, evp_cipher_free);
1403 }