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