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_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_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_128_xts:
 167         case NID_aes_256_xts:
 168         case NID_aes_256_gcm:
 169         case NID_aes_192_gcm:
 170         case NID_aes_128_gcm:
 171         case NID_aria_256_gcm:
 172         case NID_aria_192_gcm:
 173         case NID_aria_128_gcm:
 174         case NID_aes_256_ccm:
 175         case NID_aes_192_ccm:
 176         case NID_aes_128_ccm:
 177         case NID_aria_256_ccm:
 178         case NID_aria_192_ccm:
 179         case NID_aria_128_ccm:
 180         case NID_aria_256_ecb:
 181         case NID_aria_192_ecb:
 182         case NID_aria_128_ecb:
 183         case NID_aria_256_cbc:
 184         case NID_aria_192_cbc:
 185         case NID_aria_128_cbc:
 186         case NID_aria_256_ofb128:
 187         case NID_aria_192_ofb128:
 188         case NID_aria_128_ofb128:
 189         case NID_aria_256_cfb128:
 190         case NID_aria_192_cfb128:
 191         case NID_aria_128_cfb128:
 192         case NID_aria_256_cfb1:
 193         case NID_aria_192_cfb1:
 194         case NID_aria_128_cfb1:
 195         case NID_aria_256_cfb8:
 196         case NID_aria_192_cfb8:
 197         case NID_aria_128_cfb8:
 198         case NID_aria_256_ctr:
 199         case NID_aria_192_ctr:
 200         case NID_aria_128_ctr:
 201         case NID_camellia_256_ecb:
 202         case NID_camellia_192_ecb:
 203         case NID_camellia_128_ecb:
 204         case NID_camellia_256_cbc:
 205         case NID_camellia_192_cbc:
 206         case NID_camellia_128_cbc:
 207         case NID_camellia_256_ofb128:
 208         case NID_camellia_192_ofb128:
 209         case NID_camellia_128_ofb128:
 210         case NID_camellia_256_cfb128:
 211         case NID_camellia_192_cfb128:
 212         case NID_camellia_128_cfb128:
 213         case NID_camellia_256_cfb1:
 214         case NID_camellia_192_cfb1:
 215         case NID_camellia_128_cfb1:
 216         case NID_camellia_256_cfb8:
 217         case NID_camellia_192_cfb8:
 218         case NID_camellia_128_cfb8:
 219         case NID_camellia_256_ctr:
 220         case NID_camellia_192_ctr:
 221         case NID_camellia_128_ctr:
 222         case NID_des_ede3_cbc:
 223         case NID_des_ede3_ecb:
 224         case NID_des_ede3_ofb64:
 225         case NID_des_ede3_cfb64:
 226         case NID_des_ede3_cfb8:
 227         case NID_des_ede3_cfb1:
 228         case NID_des_ede_cbc:
 229         case NID_des_ede_ecb:
 230         case NID_des_ede_ofb64:
 231         case NID_des_ede_cfb64:
 232         case NID_desx_cbc:
 233         case NID_id_smime_alg_CMS3DESwrap:
 234         case NID_bf_cbc:
 235         case NID_bf_ecb:
 236         case NID_bf_cfb64:
 237         case NID_bf_ofb64:
 238         case NID_idea_cbc:
 239         case NID_idea_ecb:
 240         case NID_idea_cfb64:
 241         case NID_idea_ofb64:
 242         case NID_cast5_cbc:
 243         case NID_cast5_ecb:
 244         case NID_cast5_cfb64:
 245         case NID_cast5_ofb64:
 246         case NID_seed_cbc:
 247         case NID_seed_ecb:
 248         case NID_seed_cfb128:
 249         case NID_seed_ofb128:
 250             break;
 251         default:
 252             goto legacy;
 253         }
 254     }
 255
 256     /*
 257      * Ensure a context left lying around from last time is cleared
 258      * (legacy code)
 259      */
 260     if (cipher != NULL && ctx->cipher != NULL) {
 261         OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
 262         ctx->cipher_data = NULL;
 263     }
 264
 265
 266     /* TODO(3.0): Start of non-legacy code below */
 267
 268     /* Ensure a context left lying around from last time is cleared */
 269     if (cipher != NULL && ctx->cipher != NULL) {
 270         unsigned long flags = ctx->flags;
 271
 272         EVP_CIPHER_CTX_reset(ctx);
 273         /* Restore encrypt and flags */
 274         ctx->encrypt = enc;
 275         ctx->flags = flags;
 276     }
 277
 278     if (cipher == NULL)
 279         cipher = ctx->cipher;
 280
 281     if (cipher->prov == NULL) {
 282 #ifdef FIPS_MODE
 283         /* We only do explict fetches inside the FIPS module */
 284         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 285         return 0;
 286 #else
 287         EVP_CIPHER *provciph =
 288             EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
 289
 290         if (provciph == NULL) {
 291             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 292             return 0;
 293         }
 294         cipher = provciph;
 295         EVP_CIPHER_free(ctx->fetched_cipher);
 296         ctx->fetched_cipher = provciph;
 297 #endif
 298     }
 299
 300     ctx->cipher = cipher;
 301     if (ctx->provctx == NULL) {
 302         ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
 303         if (ctx->provctx == NULL) {
 304             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 305             return 0;
 306         }
 307     }
 308
 309     if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
 310         /*
 311          * If this ctx was already set up for no padding then we need to tell
 312          * the new cipher about it.
 313          */
 314         if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
 315             return 0;
 316     }
 317
 318     switch (EVP_CIPHER_mode(ctx->cipher)) {
 319     case EVP_CIPH_CFB_MODE:
 320     case EVP_CIPH_OFB_MODE:
 321     case EVP_CIPH_CBC_MODE:
 322         /* For these modes we remember the original IV for later use */
 323         if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
 324             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 325             return 0;
 326         }
 327         if (iv != NULL)
 328             memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 329     }
 330
 331     if (enc) {
 332         if (ctx->cipher->einit == NULL) {
 333             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 334             return 0;
 335         }
 336
 337         return ctx->cipher->einit(ctx->provctx,
 338                                   key,
 339                                   key == NULL ? 0
 340                                               : EVP_CIPHER_CTX_key_length(ctx),
 341                                   iv,
 342                                   iv == NULL ? 0
 343                                              : EVP_CIPHER_CTX_iv_length(ctx));
 344     }
 345
 346     if (ctx->cipher->dinit == NULL) {
 347         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 348         return 0;
 349     }
 350
 351     return ctx->cipher->dinit(ctx->provctx,
 352                               key,
 353                               key == NULL ? 0
 354                                           : EVP_CIPHER_CTX_key_length(ctx),
 355                               iv,
 356                               iv == NULL ? 0
 357                                          : EVP_CIPHER_CTX_iv_length(ctx));
 358
 359     /* TODO(3.0): Remove legacy code below */
 360  legacy:
 361
 362     if (cipher != NULL) {
 363         /*
 364          * Ensure a context left lying around from last time is cleared (we
 365          * previously attempted to avoid this if the same ENGINE and
 366          * EVP_CIPHER could be used).
 367          */
 368         if (ctx->cipher) {
 369             unsigned long flags = ctx->flags;
 370             EVP_CIPHER_CTX_reset(ctx);
 371             /* Restore encrypt and flags */
 372             ctx->encrypt = enc;
 373             ctx->flags = flags;
 374         }
 375 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 376         if (impl != NULL) {
 377             if (!ENGINE_init(impl)) {
 378                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 379                 return 0;
 380             }
 381         } else {
 382             impl = tmpimpl;
 383         }
 384         if (impl != NULL) {
 385             /* There's an ENGINE for this job ... (apparently) */
 386             const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
 387
 388             if (c == NULL) {
 389                 /*
 390                  * One positive side-effect of US's export control history,
 391                  * is that we should at least be able to avoid using US
 392                  * misspellings of "initialisation"?
 393                  */
 394                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 395                 return 0;
 396             }
 397             /* We'll use the ENGINE's private cipher definition */
 398             cipher = c;
 399             /*
 400              * Store the ENGINE functional reference so we know 'cipher' came
 401              * from an ENGINE and we need to release it when done.
 402              */
 403             ctx->engine = impl;
 404         } else {
 405             ctx->engine = NULL;
 406         }
 407 #endif
 408
 409         ctx->cipher = cipher;
 410         if (ctx->cipher->ctx_size) {
 411             ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
 412             if (ctx->cipher_data == NULL) {
 413                 ctx->cipher = NULL;
 414                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
 415                 return 0;
 416             }
 417         } else {
 418             ctx->cipher_data = NULL;
 419         }
 420         ctx->key_len = cipher->key_len;
 421         /* Preserve wrap enable flag, zero everything else */
 422         ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
 423         if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
 424             if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
 425                 ctx->cipher = NULL;
 426                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 427                 return 0;
 428             }
 429         }
 430     }
 431 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 432  skip_to_init:
 433 #endif
 434     if (ctx->cipher == NULL)
 435         return 0;
 436
 437     /* we assume block size is a power of 2 in *cryptUpdate */
 438     OPENSSL_assert(ctx->cipher->block_size == 1
 439                    || ctx->cipher->block_size == 8
 440                    || ctx->cipher->block_size == 16);
 441
 442     if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
 443         && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
 444         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
 445         return 0;
 446     }
 447
 448     if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
 449         switch (EVP_CIPHER_CTX_mode(ctx)) {
 450
 451         case EVP_CIPH_STREAM_CIPHER:
 452         case EVP_CIPH_ECB_MODE:
 453             break;
 454
 455         case EVP_CIPH_CFB_MODE:
 456         case EVP_CIPH_OFB_MODE:
 457
 458             ctx->num = 0;
 459             /* fall-through */
 460
 461         case EVP_CIPH_CBC_MODE:
 462
 463             OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
 464                            (int)sizeof(ctx->iv));
 465             if (iv)
 466                 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 467             memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
 468             break;
 469
 470         case EVP_CIPH_CTR_MODE:
 471             ctx->num = 0;
 472             /* Don't reuse IV for CTR mode */
 473             if (iv)
 474                 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 475             break;
 476
 477         default:
 478             return 0;
 479         }
 480     }
 481
 482     if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 483         if (!ctx->cipher->init(ctx, key, iv, enc))
 484             return 0;
 485     }
 486     ctx->buf_len = 0;
 487     ctx->final_used = 0;
 488     ctx->block_mask = ctx->cipher->block_size - 1;
 489     return 1;
 490 }
 491
 492 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 493                      const unsigned char *in, int inl)
 494 {
 495     if (ctx->encrypt)
 496         return EVP_EncryptUpdate(ctx, out, outl, in, inl);
 497     else
 498         return EVP_DecryptUpdate(ctx, out, outl, in, inl);
 499 }
 500
 501 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 502 {
 503     if (ctx->encrypt)
 504         return EVP_EncryptFinal_ex(ctx, out, outl);
 505     else
 506         return EVP_DecryptFinal_ex(ctx, out, outl);
 507 }
 508
 509 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 510 {
 511     if (ctx->encrypt)
 512         return EVP_EncryptFinal(ctx, out, outl);
 513     else
 514         return EVP_DecryptFinal(ctx, out, outl);
 515 }
 516
 517 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 518                     const unsigned char *key, const unsigned char *iv)
 519 {
 520     return EVP_CipherInit(ctx, cipher, key, iv, 1);
 521 }
 522
 523 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 524                        ENGINE *impl, const unsigned char *key,
 525                        const unsigned char *iv)
 526 {
 527     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 528 }
 529
 530 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 531                     const unsigned char *key, const unsigned char *iv)
 532 {
 533     return EVP_CipherInit(ctx, cipher, key, iv, 0);
 534 }
 535
 536 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 537                        ENGINE *impl, const unsigned char *key,
 538                        const unsigned char *iv)
 539 {
 540     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 541 }
 542
 543 /*
 544  * According to the letter of standard difference between pointers
 545  * is specified to be valid only within same object. This makes
 546  * it formally challenging to determine if input and output buffers
 547  * are not partially overlapping with standard pointer arithmetic.
 548  */
 549 #ifdef PTRDIFF_T
 550 # undef PTRDIFF_T
 551 #endif
 552 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
 553 /*
 554  * Then we have VMS that distinguishes itself by adhering to
 555  * sizeof(size_t)==4 even in 64-bit builds, which means that
 556  * difference between two pointers might be truncated to 32 bits.
 557  * In the context one can even wonder how comparison for
 558  * equality is implemented. To be on the safe side we adhere to
 559  * PTRDIFF_T even for comparison for equality.
 560  */
 561 # define PTRDIFF_T uint64_t
 562 #else
 563 # define PTRDIFF_T size_t
 564 #endif
 565
 566 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
 567 {
 568     PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
 569     /*
 570      * Check for partially overlapping buffers. [Binary logical
 571      * operations are used instead of boolean to minimize number
 572      * of conditional branches.]
 573      */
 574     int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
 575                                                 (diff > (0 - (PTRDIFF_T)len)));
 576
 577     return overlapped;
 578 }
 579
 580 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
 581                                     unsigned char *out, int *outl,
 582                                     const unsigned char *in, int inl)
 583 {
 584     int i, j, bl, cmpl = inl;
 585
 586     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 587         cmpl = (cmpl + 7) / 8;
 588
 589     bl = ctx->cipher->block_size;
 590
 591     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 592         /* If block size > 1 then the cipher will have to do this check */
 593         if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
 594             EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 595             return 0;
 596         }
 597
 598         i = ctx->cipher->do_cipher(ctx, out, in, inl);
 599         if (i < 0)
 600             return 0;
 601         else
 602             *outl = i;
 603         return 1;
 604     }
 605
 606     if (inl <= 0) {
 607         *outl = 0;
 608         return inl == 0;
 609     }
 610     if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
 611         EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 612         return 0;
 613     }
 614
 615     if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
 616         if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
 617             *outl = inl;
 618             return 1;
 619         } else {
 620             *outl = 0;
 621             return 0;
 622         }
 623     }
 624     i = ctx->buf_len;
 625     OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
 626     if (i != 0) {
 627         if (bl - i > inl) {
 628             memcpy(&(ctx->buf[i]), in, inl);
 629             ctx->buf_len += inl;
 630             *outl = 0;
 631             return 1;
 632         } else {
 633             j = bl - i;
 634             memcpy(&(ctx->buf[i]), in, j);
 635             inl -= j;
 636             in += j;
 637             if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
 638                 return 0;
 639             out += bl;
 640             *outl = bl;
 641         }
 642     } else
 643         *outl = 0;
 644     i = inl & (bl - 1);
 645     inl -= i;
 646     if (inl > 0) {
 647         if (!ctx->cipher->do_cipher(ctx, out, in, inl))
 648             return 0;
 649         *outl += inl;
 650     }
 651
 652     if (i != 0)
 653         memcpy(ctx->buf, &(in[inl]), i);
 654     ctx->buf_len = i;
 655     return 1;
 656 }
 657
 658
 659 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 660                       const unsigned char *in, int inl)
 661 {
 662     int ret;
 663     size_t soutl;
 664     int blocksize;
 665
 666     /* Prevent accidental use of decryption context when encrypting */
 667     if (!ctx->encrypt) {
 668         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
 669         return 0;
 670     }
 671
 672     if (ctx->cipher == NULL) {
 673         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 674         return 0;
 675     }
 676
 677     if (ctx->cipher->prov == NULL)
 678         goto legacy;
 679
 680     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 681
 682     if (ctx->cipher->cupdate == NULL  || blocksize < 1) {
 683         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 684         return 0;
 685     }
 686     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 687                                inl + (blocksize == 1 ? 0 : blocksize), in,
 688                                (size_t)inl);
 689
 690     if (ret) {
 691         if (soutl > INT_MAX) {
 692             EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 693             return 0;
 694         }
 695         *outl = soutl;
 696     }
 697
 698     return ret;
 699
 700     /* TODO(3.0): Remove legacy code below */
 701  legacy:
 702
 703     return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 704 }
 705
 706 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 707 {
 708     int ret;
 709     ret = EVP_EncryptFinal_ex(ctx, out, outl);
 710     return ret;
 711 }
 712
 713 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 714 {
 715     int n, ret;
 716     unsigned int i, b, bl;
 717     size_t soutl;
 718     int blocksize;
 719
 720     /* Prevent accidental use of decryption context when encrypting */
 721     if (!ctx->encrypt) {
 722         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 723         return 0;
 724     }
 725
 726     if (ctx->cipher == NULL) {
 727         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 728         return 0;
 729     }
 730     if (ctx->cipher->prov == NULL)
 731         goto legacy;
 732
 733     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 734
 735     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 736         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 737         return 0;
 738     }
 739
 740     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 741                               blocksize == 1 ? 0 : blocksize);
 742
 743     if (ret) {
 744         if (soutl > INT_MAX) {
 745             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 746             return 0;
 747         }
 748         *outl = soutl;
 749     }
 750
 751     return ret;
 752
 753     /* TODO(3.0): Remove legacy code below */
 754  legacy:
 755
 756     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 757         ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 758         if (ret < 0)
 759             return 0;
 760         else
 761             *outl = ret;
 762         return 1;
 763     }
 764
 765     b = ctx->cipher->block_size;
 766     OPENSSL_assert(b <= sizeof(ctx->buf));
 767     if (b == 1) {
 768         *outl = 0;
 769         return 1;
 770     }
 771     bl = ctx->buf_len;
 772     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 773         if (bl) {
 774             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
 775                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 776             return 0;
 777         }
 778         *outl = 0;
 779         return 1;
 780     }
 781
 782     n = b - bl;
 783     for (i = bl; i < b; i++)
 784         ctx->buf[i] = n;
 785     ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
 786
 787     if (ret)
 788         *outl = b;
 789
 790     return ret;
 791 }
 792
 793 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 794                       const unsigned char *in, int inl)
 795 {
 796     int fix_len, cmpl = inl, ret;
 797     unsigned int b;
 798     size_t soutl;
 799     int blocksize;
 800
 801     /* Prevent accidental use of encryption context when decrypting */
 802     if (ctx->encrypt) {
 803         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
 804         return 0;
 805     }
 806
 807     if (ctx->cipher == NULL) {
 808         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 809         return 0;
 810     }
 811     if (ctx->cipher->prov == NULL)
 812         goto legacy;
 813
 814     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 815
 816     if (ctx->cipher->cupdate == NULL || blocksize < 1) {
 817         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 818         return 0;
 819     }
 820     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 821                                inl + (blocksize == 1 ? 0 : blocksize), in,
 822                                (size_t)inl);
 823
 824     if (ret) {
 825         if (soutl > INT_MAX) {
 826             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 827             return 0;
 828         }
 829         *outl = soutl;
 830     }
 831
 832     return ret;
 833
 834     /* TODO(3.0): Remove legacy code below */
 835  legacy:
 836
 837     b = ctx->cipher->block_size;
 838
 839     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 840         cmpl = (cmpl + 7) / 8;
 841
 842     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 843         if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
 844             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 845             return 0;
 846         }
 847
 848         fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
 849         if (fix_len < 0) {
 850             *outl = 0;
 851             return 0;
 852         } else
 853             *outl = fix_len;
 854         return 1;
 855     }
 856
 857     if (inl <= 0) {
 858         *outl = 0;
 859         return inl == 0;
 860     }
 861
 862     if (ctx->flags & EVP_CIPH_NO_PADDING)
 863         return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 864
 865     OPENSSL_assert(b <= sizeof(ctx->final));
 866
 867     if (ctx->final_used) {
 868         /* see comment about PTRDIFF_T comparison above */
 869         if (((PTRDIFF_T)out == (PTRDIFF_T)in)
 870             || is_partially_overlapping(out, in, b)) {
 871             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 872             return 0;
 873         }
 874         memcpy(out, ctx->final, b);
 875         out += b;
 876         fix_len = 1;
 877     } else
 878         fix_len = 0;
 879
 880     if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
 881         return 0;
 882
 883     /*
 884      * if we have 'decrypted' a multiple of block size, make sure we have a
 885      * copy of this last block
 886      */
 887     if (b > 1 && !ctx->buf_len) {
 888         *outl -= b;
 889         ctx->final_used = 1;
 890         memcpy(ctx->final, &out[*outl], b);
 891     } else
 892         ctx->final_used = 0;
 893
 894     if (fix_len)
 895         *outl += b;
 896
 897     return 1;
 898 }
 899
 900 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 901 {
 902     int ret;
 903     ret = EVP_DecryptFinal_ex(ctx, out, outl);
 904     return ret;
 905 }
 906
 907 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 908 {
 909     int i, n;
 910     unsigned int b;
 911     size_t soutl;
 912     int ret;
 913     int blocksize;
 914
 915     /* Prevent accidental use of encryption context when decrypting */
 916     if (ctx->encrypt) {
 917         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 918         return 0;
 919     }
 920
 921     if (ctx->cipher == NULL) {
 922         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 923         return 0;
 924     }
 925
 926     if (ctx->cipher->prov == NULL)
 927         goto legacy;
 928
 929     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 930
 931     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 932         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 933         return 0;
 934     }
 935
 936     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 937                               blocksize == 1 ? 0 : blocksize);
 938
 939     if (ret) {
 940         if (soutl > INT_MAX) {
 941             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 942             return 0;
 943         }
 944         *outl = soutl;
 945     }
 946
 947     return ret;
 948
 949     /* TODO(3.0): Remove legacy code below */
 950  legacy:
 951
 952     *outl = 0;
 953     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 954         i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 955         if (i < 0)
 956             return 0;
 957         else
 958             *outl = i;
 959         return 1;
 960     }
 961
 962     b = ctx->cipher->block_size;
 963     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 964         if (ctx->buf_len) {
 965             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
 966                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 967             return 0;
 968         }
 969         *outl = 0;
 970         return 1;
 971     }
 972     if (b > 1) {
 973         if (ctx->buf_len || !ctx->final_used) {
 974             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 975             return 0;
 976         }
 977         OPENSSL_assert(b <= sizeof(ctx->final));
 978
 979         /*
 980          * The following assumes that the ciphertext has been authenticated.
 981          * Otherwise it provides a padding oracle.
 982          */
 983         n = ctx->final[b - 1];
 984         if (n == 0 || n > (int)b) {
 985             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
 986             return 0;
 987         }
 988         for (i = 0; i < n; i++) {
 989             if (ctx->final[--b] != n) {
 990                 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
 991                 return 0;
 992             }
 993         }
 994         n = ctx->cipher->block_size - n;
 995         for (i = 0; i < n; i++)
 996             out[i] = ctx->final[i];
 997         *outl = n;
 998     } else
 999         *outl = 0;
1000     return 1;
1001 }
1002
1003 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
1004 {
1005     int ok;
1006     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1007     size_t len = keylen;
1008
1009     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
1010     ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
1011
1012     if (ok != EVP_CTRL_RET_UNSUPPORTED)
1013         return ok;
1014
1015     /* TODO(3.0) legacy code follows */
1016     if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
1017         return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
1018     if (EVP_CIPHER_CTX_key_length(c) == keylen)
1019         return 1;
1020     if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
1021         c->key_len = keylen;
1022         return 1;
1023     }
1024     EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
1025     return 0;
1026 }
1027
1028 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
1029 {
1030     int ok;
1031     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1032     unsigned int pd = pad;
1033
1034     if (pad)
1035         ctx->flags &= ~EVP_CIPH_NO_PADDING;
1036     else
1037         ctx->flags |= EVP_CIPH_NO_PADDING;
1038
1039     params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
1040     ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1041
1042     return ok != 0;
1043 }
1044
1045 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
1046 {
1047     int ret = EVP_CTRL_RET_UNSUPPORTED;
1048     int set_params = 1;
1049     size_t sz = arg;
1050     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1051
1052     if (ctx == NULL || ctx->cipher == NULL) {
1053         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
1054         return 0;
1055     }
1056
1057     if (ctx->cipher->prov == NULL)
1058         goto legacy;
1059
1060     switch (type) {
1061     case EVP_CTRL_SET_KEY_LENGTH:
1062         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
1063         break;
1064     case EVP_CTRL_RAND_KEY:      /* Used by DES */
1065         set_params = 0;
1066         params[0] =
1067             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
1068                                               ptr, sz);
1069         break;
1070
1071     case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
1072     case EVP_CTRL_INIT: /* TODO(3.0) Purely legacy, no provider counterpart */
1073     default:
1074         return EVP_CTRL_RET_UNSUPPORTED;
1075     case EVP_CTRL_GET_IV:
1076         set_params = 0;
1077         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
1078                                                       ptr, sz);
1079         break;
1080     case EVP_CTRL_AEAD_SET_IVLEN:
1081         if (arg < 0)
1082             return 0;
1083         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
1084         break;
1085     case EVP_CTRL_GCM_SET_IV_FIXED:
1086         params[0] =
1087             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED,
1088                                               ptr, sz);
1089         break;
1090     case EVP_CTRL_AEAD_GET_TAG:
1091         set_params = 0; /* Fall thru */
1092     case EVP_CTRL_AEAD_SET_TAG:
1093         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1094                                                       ptr, sz);
1095         break;
1096     case EVP_CTRL_AEAD_TLS1_AAD:
1097         /* This one does a set and a get - since it returns a padding size */
1098         params[0] =
1099             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1100                                               ptr, sz);
1101         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1102         if (ret <= 0)
1103             return ret;
1104         params[0] =
1105             OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1106         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1107         if (ret <= 0)
1108             return 0;
1109         return sz;
1110     }
1111
1112     if (set_params)
1113         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1114     else
1115         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1116     return ret;
1117
1118 /* TODO(3.0): Remove legacy code below */
1119 legacy:
1120     if (ctx->cipher->ctrl == NULL) {
1121         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1122         return 0;
1123     }
1124
1125     ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1126     if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1127         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1128                EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1129         return 0;
1130     }
1131     return ret;
1132 }
1133
1134 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1135 {
1136     if (cipher != NULL && cipher->get_params != NULL)
1137         return cipher->get_params(params);
1138     return 0;
1139 }
1140
1141 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1142 {
1143     if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1144         return ctx->cipher->set_ctx_params(ctx->provctx, params);
1145     return 0;
1146 }
1147
1148 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1149 {
1150     if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1151         return ctx->cipher->get_ctx_params(ctx->provctx, params);
1152     return 0;
1153 }
1154
1155 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1156 {
1157     if (cipher != NULL && cipher->gettable_params != NULL)
1158         return cipher->gettable_params();
1159     return NULL;
1160 }
1161
1162 const OSSL_PARAM *EVP_CIPHER_CTX_settable_params(const EVP_CIPHER *cipher)
1163 {
1164     if (cipher != NULL && cipher->settable_ctx_params != NULL)
1165         return cipher->settable_ctx_params();
1166     return NULL;
1167 }
1168
1169 const OSSL_PARAM *EVP_CIPHER_CTX_gettable_params(const EVP_CIPHER *cipher)
1170 {
1171     if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1172         return cipher->gettable_ctx_params();
1173     return NULL;
1174 }
1175
1176 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1177 {
1178     if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1179         return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1180
1181 #ifdef FIPS_MODE
1182     return 0;
1183 #else
1184     {
1185         int kl;
1186
1187         kl = EVP_CIPHER_CTX_key_length(ctx);
1188         if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1189             return 0;
1190         return 1;
1191     }
1192 #endif /* FIPS_MODE */
1193 }
1194
1195 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1196 {
1197     if ((in == NULL) || (in->cipher == NULL)) {
1198         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1199         return 0;
1200     }
1201
1202     if (in->cipher->prov == NULL)
1203         goto legacy;
1204
1205     if (in->cipher->dupctx == NULL) {
1206         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1207         return 0;
1208     }
1209
1210     EVP_CIPHER_CTX_reset(out);
1211
1212     *out = *in;
1213     out->provctx = NULL;
1214
1215     if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1216         out->fetched_cipher = NULL;
1217         return 0;
1218     }
1219
1220     out->provctx = in->cipher->dupctx(in->provctx);
1221     if (out->provctx == NULL) {
1222         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1223         return 0;
1224     }
1225
1226     return 1;
1227
1228     /* TODO(3.0): Remove legacy code below */
1229  legacy:
1230
1231 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1232     /* Make sure it's safe to copy a cipher context using an ENGINE */
1233     if (in->engine && !ENGINE_init(in->engine)) {
1234         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1235         return 0;
1236     }
1237 #endif
1238
1239     EVP_CIPHER_CTX_reset(out);
1240     memcpy(out, in, sizeof(*out));
1241
1242     if (in->cipher_data && in->cipher->ctx_size) {
1243         out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1244         if (out->cipher_data == NULL) {
1245             out->cipher = NULL;
1246             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1247             return 0;
1248         }
1249         memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1250     }
1251
1252     if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1253         if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1254             out->cipher = NULL;
1255             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1256             return 0;
1257         }
1258     return 1;
1259 }
1260
1261 EVP_CIPHER *evp_cipher_new(void)
1262 {
1263     EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1264
1265     if (cipher != NULL) {
1266         cipher->lock = CRYPTO_THREAD_lock_new();
1267         if (cipher->lock == NULL) {
1268             OPENSSL_free(cipher);
1269             return NULL;
1270         }
1271         cipher->refcnt = 1;
1272     }
1273     return cipher;
1274 }
1275
1276 static void *evp_cipher_from_dispatch(const char *name,
1277                                       const OSSL_DISPATCH *fns,
1278                                       OSSL_PROVIDER *prov,
1279                                       void *unused)
1280 {
1281     EVP_CIPHER *cipher = NULL;
1282     int fnciphcnt = 0, fnctxcnt = 0;
1283
1284     if ((cipher = evp_cipher_new()) == NULL
1285         || (cipher->name = OPENSSL_strdup(name)) == NULL) {
1286         EVP_CIPHER_free(cipher);
1287         EVPerr(0, ERR_R_MALLOC_FAILURE);
1288         return NULL;
1289     }
1290
1291 #ifndef FIPS_MODE
1292     /*
1293      * FIPS module note: since internal fetches will be entirely
1294      * provider based, we know that none of its code depends on legacy
1295      * NIDs or any functionality that use them.
1296      *
1297      * TODO(3.x) get rid of the need for legacy NIDs
1298      */
1299     cipher->nid = OBJ_sn2nid(name);
1300 #endif
1301
1302     for (; fns->function_id != 0; fns++) {
1303         switch (fns->function_id) {
1304         case OSSL_FUNC_CIPHER_NEWCTX:
1305             if (cipher->newctx != NULL)
1306                 break;
1307             cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1308             fnctxcnt++;
1309             break;
1310         case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1311             if (cipher->einit != NULL)
1312                 break;
1313             cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1314             fnciphcnt++;
1315             break;
1316         case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1317             if (cipher->dinit != NULL)
1318                 break;
1319             cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1320             fnciphcnt++;
1321             break;
1322         case OSSL_FUNC_CIPHER_UPDATE:
1323             if (cipher->cupdate != NULL)
1324                 break;
1325             cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1326             fnciphcnt++;
1327             break;
1328         case OSSL_FUNC_CIPHER_FINAL:
1329             if (cipher->cfinal != NULL)
1330                 break;
1331             cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1332             fnciphcnt++;
1333             break;
1334         case OSSL_FUNC_CIPHER_CIPHER:
1335             if (cipher->ccipher != NULL)
1336                 break;
1337             cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1338             break;
1339         case OSSL_FUNC_CIPHER_FREECTX:
1340             if (cipher->freectx != NULL)
1341                 break;
1342             cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1343             fnctxcnt++;
1344             break;
1345         case OSSL_FUNC_CIPHER_DUPCTX:
1346             if (cipher->dupctx != NULL)
1347                 break;
1348             cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1349             break;
1350         case OSSL_FUNC_CIPHER_GET_PARAMS:
1351             if (cipher->get_params != NULL)
1352                 break;
1353             cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1354             break;
1355         case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1356             if (cipher->get_ctx_params != NULL)
1357                 break;
1358             cipher->get_ctx_params = OSSL_get_OP_cipher_get_ctx_params(fns);
1359             break;
1360         case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1361             if (cipher->set_ctx_params != NULL)
1362                 break;
1363             cipher->set_ctx_params = OSSL_get_OP_cipher_set_ctx_params(fns);
1364             break;
1365         case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1366             if (cipher->gettable_params != NULL)
1367                 break;
1368             cipher->gettable_params = OSSL_get_OP_cipher_gettable_params(fns);
1369             break;
1370         case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1371             if (cipher->gettable_ctx_params != NULL)
1372                 break;
1373             cipher->gettable_ctx_params =
1374                 OSSL_get_OP_cipher_gettable_ctx_params(fns);
1375             break;
1376         case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1377             if (cipher->settable_ctx_params != NULL)
1378                 break;
1379             cipher->settable_ctx_params =
1380                 OSSL_get_OP_cipher_settable_ctx_params(fns);
1381             break;
1382         }
1383     }
1384     if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1385             || (fnciphcnt == 0 && cipher->ccipher == NULL)
1386             || fnctxcnt != 2) {
1387         /*
1388          * In order to be a consistent set of functions we must have at least
1389          * a complete set of "encrypt" functions, or a complete set of "decrypt"
1390          * functions, or a single "cipher" function. In all cases we need both
1391          * the "newctx" and "freectx" functions.
1392          */
1393         EVP_CIPHER_free(cipher);
1394         EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1395         return NULL;
1396     }
1397     cipher->prov = prov;
1398     if (prov != NULL)
1399         ossl_provider_up_ref(prov);
1400
1401     return cipher;
1402 }
1403
1404 static int evp_cipher_up_ref(void *cipher)
1405 {
1406     return EVP_CIPHER_up_ref(cipher);
1407 }
1408
1409 static void evp_cipher_free(void *cipher)
1410 {
1411     EVP_CIPHER_free(cipher);
1412 }
1413
1414 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1415                              const char *properties)
1416 {
1417     EVP_CIPHER *cipher =
1418         evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1419                           evp_cipher_from_dispatch, NULL, evp_cipher_up_ref,
1420                           evp_cipher_free);
1421
1422     return cipher;
1423 }
1424
1425 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1426 {
1427     int ref = 0;
1428
1429     CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1430     return 1;
1431 }
1432
1433 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1434 {
1435     int i;
1436
1437     if (cipher == NULL)
1438         return;
1439
1440     CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1441     if (i > 0)
1442         return;
1443     ossl_provider_free(cipher->prov);
1444     OPENSSL_free(cipher->name);
1445     CRYPTO_THREAD_lock_free(cipher->lock);
1446     OPENSSL_free(cipher);
1447 }
1448
1449 void EVP_CIPHER_do_all_ex(OPENSSL_CTX *libctx,
1450                           void (*fn)(EVP_CIPHER *mac, void *arg),
1451                           void *arg)
1452 {
1453     evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1454                        (void (*)(void *, void *))fn, arg,
1455                        evp_cipher_from_dispatch, NULL, evp_cipher_free);
1456 }