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_ocb:
 169         case NID_aes_192_ocb:
 170         case NID_aes_128_ocb:
 171         case NID_aes_256_gcm:
 172         case NID_aes_192_gcm:
 173         case NID_aes_128_gcm:
 174         case NID_id_aes256_wrap:
 175         case NID_id_aes256_wrap_pad:
 176         case NID_id_aes192_wrap:
 177         case NID_id_aes192_wrap_pad:
 178         case NID_id_aes128_wrap:
 179         case NID_id_aes128_wrap_pad:
 180         case NID_aria_256_gcm:
 181         case NID_aria_192_gcm:
 182         case NID_aria_128_gcm:
 183         case NID_aes_256_ccm:
 184         case NID_aes_192_ccm:
 185         case NID_aes_128_ccm:
 186         case NID_aria_256_ccm:
 187         case NID_aria_192_ccm:
 188         case NID_aria_128_ccm:
 189         case NID_aria_256_ecb:
 190         case NID_aria_192_ecb:
 191         case NID_aria_128_ecb:
 192         case NID_aria_256_cbc:
 193         case NID_aria_192_cbc:
 194         case NID_aria_128_cbc:
 195         case NID_aria_256_ofb128:
 196         case NID_aria_192_ofb128:
 197         case NID_aria_128_ofb128:
 198         case NID_aria_256_cfb128:
 199         case NID_aria_192_cfb128:
 200         case NID_aria_128_cfb128:
 201         case NID_aria_256_cfb1:
 202         case NID_aria_192_cfb1:
 203         case NID_aria_128_cfb1:
 204         case NID_aria_256_cfb8:
 205         case NID_aria_192_cfb8:
 206         case NID_aria_128_cfb8:
 207         case NID_aria_256_ctr:
 208         case NID_aria_192_ctr:
 209         case NID_aria_128_ctr:
 210         case NID_camellia_256_ecb:
 211         case NID_camellia_192_ecb:
 212         case NID_camellia_128_ecb:
 213         case NID_camellia_256_cbc:
 214         case NID_camellia_192_cbc:
 215         case NID_camellia_128_cbc:
 216         case NID_camellia_256_ofb128:
 217         case NID_camellia_192_ofb128:
 218         case NID_camellia_128_ofb128:
 219         case NID_camellia_256_cfb128:
 220         case NID_camellia_192_cfb128:
 221         case NID_camellia_128_cfb128:
 222         case NID_camellia_256_cfb1:
 223         case NID_camellia_192_cfb1:
 224         case NID_camellia_128_cfb1:
 225         case NID_camellia_256_cfb8:
 226         case NID_camellia_192_cfb8:
 227         case NID_camellia_128_cfb8:
 228         case NID_camellia_256_ctr:
 229         case NID_camellia_192_ctr:
 230         case NID_camellia_128_ctr:
 231         case NID_des_ede3_cbc:
 232         case NID_des_ede3_ecb:
 233         case NID_des_ede3_ofb64:
 234         case NID_des_ede3_cfb64:
 235         case NID_des_ede3_cfb8:
 236         case NID_des_ede3_cfb1:
 237         case NID_des_ede_cbc:
 238         case NID_des_ede_ecb:
 239         case NID_des_ede_ofb64:
 240         case NID_des_ede_cfb64:
 241         case NID_desx_cbc:
 242         case NID_des_cbc:
 243         case NID_des_ecb:
 244         case NID_des_cfb1:
 245         case NID_des_cfb8:
 246         case NID_des_cfb64:
 247         case NID_des_ofb64:
 248         case NID_id_smime_alg_CMS3DESwrap:
 249         case NID_bf_cbc:
 250         case NID_bf_ecb:
 251         case NID_bf_cfb64:
 252         case NID_bf_ofb64:
 253         case NID_idea_cbc:
 254         case NID_idea_ecb:
 255         case NID_idea_cfb64:
 256         case NID_idea_ofb64:
 257         case NID_cast5_cbc:
 258         case NID_cast5_ecb:
 259         case NID_cast5_cfb64:
 260         case NID_cast5_ofb64:
 261         case NID_seed_cbc:
 262         case NID_seed_ecb:
 263         case NID_seed_cfb128:
 264         case NID_seed_ofb128:
 265         case NID_sm4_cbc:
 266         case NID_sm4_ecb:
 267         case NID_sm4_ctr:
 268         case NID_sm4_cfb128:
 269         case NID_sm4_ofb128:
 270             break;
 271         default:
 272             goto legacy;
 273         }
 274     }
 275
 276     /*
 277      * Ensure a context left lying around from last time is cleared
 278      * (legacy code)
 279      */
 280     if (cipher != NULL && ctx->cipher != NULL) {
 281         OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
 282         ctx->cipher_data = NULL;
 283     }
 284
 285
 286     /* TODO(3.0): Start of non-legacy code below */
 287
 288     /* Ensure a context left lying around from last time is cleared */
 289     if (cipher != NULL && ctx->cipher != NULL) {
 290         unsigned long flags = ctx->flags;
 291
 292         EVP_CIPHER_CTX_reset(ctx);
 293         /* Restore encrypt and flags */
 294         ctx->encrypt = enc;
 295         ctx->flags = flags;
 296     }
 297
 298     if (cipher == NULL)
 299         cipher = ctx->cipher;
 300
 301     if (cipher->prov == NULL) {
 302 #ifdef FIPS_MODE
 303         /* We only do explict fetches inside the FIPS module */
 304         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 305         return 0;
 306 #else
 307         EVP_CIPHER *provciph =
 308             EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
 309
 310         if (provciph == NULL) {
 311             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 312             return 0;
 313         }
 314         cipher = provciph;
 315         EVP_CIPHER_free(ctx->fetched_cipher);
 316         ctx->fetched_cipher = provciph;
 317 #endif
 318     }
 319
 320     ctx->cipher = cipher;
 321     if (ctx->provctx == NULL) {
 322         ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
 323         if (ctx->provctx == NULL) {
 324             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 325             return 0;
 326         }
 327     }
 328
 329     if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
 330         /*
 331          * If this ctx was already set up for no padding then we need to tell
 332          * the new cipher about it.
 333          */
 334         if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
 335             return 0;
 336     }
 337
 338     switch (EVP_CIPHER_mode(ctx->cipher)) {
 339     case EVP_CIPH_CFB_MODE:
 340     case EVP_CIPH_OFB_MODE:
 341     case EVP_CIPH_CBC_MODE:
 342         /* For these modes we remember the original IV for later use */
 343         if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
 344             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 345             return 0;
 346         }
 347         if (iv != NULL)
 348             memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 349     }
 350
 351     if (enc) {
 352         if (ctx->cipher->einit == NULL) {
 353             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 354             return 0;
 355         }
 356
 357         return ctx->cipher->einit(ctx->provctx,
 358                                   key,
 359                                   key == NULL ? 0
 360                                               : EVP_CIPHER_CTX_key_length(ctx),
 361                                   iv,
 362                                   iv == NULL ? 0
 363                                              : EVP_CIPHER_CTX_iv_length(ctx));
 364     }
 365
 366     if (ctx->cipher->dinit == NULL) {
 367         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 368         return 0;
 369     }
 370
 371     return ctx->cipher->dinit(ctx->provctx,
 372                               key,
 373                               key == NULL ? 0
 374                                           : EVP_CIPHER_CTX_key_length(ctx),
 375                               iv,
 376                               iv == NULL ? 0
 377                                          : EVP_CIPHER_CTX_iv_length(ctx));
 378
 379     /* TODO(3.0): Remove legacy code below */
 380  legacy:
 381
 382     if (cipher != NULL) {
 383         /*
 384          * Ensure a context left lying around from last time is cleared (we
 385          * previously attempted to avoid this if the same ENGINE and
 386          * EVP_CIPHER could be used).
 387          */
 388         if (ctx->cipher) {
 389             unsigned long flags = ctx->flags;
 390             EVP_CIPHER_CTX_reset(ctx);
 391             /* Restore encrypt and flags */
 392             ctx->encrypt = enc;
 393             ctx->flags = flags;
 394         }
 395 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 396         if (impl != NULL) {
 397             if (!ENGINE_init(impl)) {
 398                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 399                 return 0;
 400             }
 401         } else {
 402             impl = tmpimpl;
 403         }
 404         if (impl != NULL) {
 405             /* There's an ENGINE for this job ... (apparently) */
 406             const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
 407
 408             if (c == NULL) {
 409                 /*
 410                  * One positive side-effect of US's export control history,
 411                  * is that we should at least be able to avoid using US
 412                  * misspellings of "initialisation"?
 413                  */
 414                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 415                 return 0;
 416             }
 417             /* We'll use the ENGINE's private cipher definition */
 418             cipher = c;
 419             /*
 420              * Store the ENGINE functional reference so we know 'cipher' came
 421              * from an ENGINE and we need to release it when done.
 422              */
 423             ctx->engine = impl;
 424         } else {
 425             ctx->engine = NULL;
 426         }
 427 #endif
 428
 429         ctx->cipher = cipher;
 430         if (ctx->cipher->ctx_size) {
 431             ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
 432             if (ctx->cipher_data == NULL) {
 433                 ctx->cipher = NULL;
 434                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
 435                 return 0;
 436             }
 437         } else {
 438             ctx->cipher_data = NULL;
 439         }
 440         ctx->key_len = cipher->key_len;
 441         /* Preserve wrap enable flag, zero everything else */
 442         ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
 443         if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
 444             if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
 445                 ctx->cipher = NULL;
 446                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 447                 return 0;
 448             }
 449         }
 450     }
 451 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 452  skip_to_init:
 453 #endif
 454     if (ctx->cipher == NULL)
 455         return 0;
 456
 457     /* we assume block size is a power of 2 in *cryptUpdate */
 458     OPENSSL_assert(ctx->cipher->block_size == 1
 459                    || ctx->cipher->block_size == 8
 460                    || ctx->cipher->block_size == 16);
 461
 462     if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
 463         && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
 464         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
 465         return 0;
 466     }
 467
 468     if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
 469         switch (EVP_CIPHER_CTX_mode(ctx)) {
 470
 471         case EVP_CIPH_STREAM_CIPHER:
 472         case EVP_CIPH_ECB_MODE:
 473             break;
 474
 475         case EVP_CIPH_CFB_MODE:
 476         case EVP_CIPH_OFB_MODE:
 477
 478             ctx->num = 0;
 479             /* fall-through */
 480
 481         case EVP_CIPH_CBC_MODE:
 482
 483             OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
 484                            (int)sizeof(ctx->iv));
 485             if (iv)
 486                 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 487             memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
 488             break;
 489
 490         case EVP_CIPH_CTR_MODE:
 491             ctx->num = 0;
 492             /* Don't reuse IV for CTR mode */
 493             if (iv)
 494                 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 495             break;
 496
 497         default:
 498             return 0;
 499         }
 500     }
 501
 502     if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 503         if (!ctx->cipher->init(ctx, key, iv, enc))
 504             return 0;
 505     }
 506     ctx->buf_len = 0;
 507     ctx->final_used = 0;
 508     ctx->block_mask = ctx->cipher->block_size - 1;
 509     return 1;
 510 }
 511
 512 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 513                      const unsigned char *in, int inl)
 514 {
 515     if (ctx->encrypt)
 516         return EVP_EncryptUpdate(ctx, out, outl, in, inl);
 517     else
 518         return EVP_DecryptUpdate(ctx, out, outl, in, inl);
 519 }
 520
 521 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 522 {
 523     if (ctx->encrypt)
 524         return EVP_EncryptFinal_ex(ctx, out, outl);
 525     else
 526         return EVP_DecryptFinal_ex(ctx, out, outl);
 527 }
 528
 529 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 530 {
 531     if (ctx->encrypt)
 532         return EVP_EncryptFinal(ctx, out, outl);
 533     else
 534         return EVP_DecryptFinal(ctx, out, outl);
 535 }
 536
 537 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 538                     const unsigned char *key, const unsigned char *iv)
 539 {
 540     return EVP_CipherInit(ctx, cipher, key, iv, 1);
 541 }
 542
 543 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 544                        ENGINE *impl, const unsigned char *key,
 545                        const unsigned char *iv)
 546 {
 547     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 548 }
 549
 550 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 551                     const unsigned char *key, const unsigned char *iv)
 552 {
 553     return EVP_CipherInit(ctx, cipher, key, iv, 0);
 554 }
 555
 556 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 557                        ENGINE *impl, const unsigned char *key,
 558                        const unsigned char *iv)
 559 {
 560     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 561 }
 562
 563 /*
 564  * According to the letter of standard difference between pointers
 565  * is specified to be valid only within same object. This makes
 566  * it formally challenging to determine if input and output buffers
 567  * are not partially overlapping with standard pointer arithmetic.
 568  */
 569 #ifdef PTRDIFF_T
 570 # undef PTRDIFF_T
 571 #endif
 572 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
 573 /*
 574  * Then we have VMS that distinguishes itself by adhering to
 575  * sizeof(size_t)==4 even in 64-bit builds, which means that
 576  * difference between two pointers might be truncated to 32 bits.
 577  * In the context one can even wonder how comparison for
 578  * equality is implemented. To be on the safe side we adhere to
 579  * PTRDIFF_T even for comparison for equality.
 580  */
 581 # define PTRDIFF_T uint64_t
 582 #else
 583 # define PTRDIFF_T size_t
 584 #endif
 585
 586 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
 587 {
 588     PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
 589     /*
 590      * Check for partially overlapping buffers. [Binary logical
 591      * operations are used instead of boolean to minimize number
 592      * of conditional branches.]
 593      */
 594     int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
 595                                                 (diff > (0 - (PTRDIFF_T)len)));
 596
 597     return overlapped;
 598 }
 599
 600 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
 601                                     unsigned char *out, int *outl,
 602                                     const unsigned char *in, int inl)
 603 {
 604     int i, j, bl, cmpl = inl;
 605
 606     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 607         cmpl = (cmpl + 7) / 8;
 608
 609     bl = ctx->cipher->block_size;
 610
 611     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 612         /* If block size > 1 then the cipher will have to do this check */
 613         if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
 614             EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 615             return 0;
 616         }
 617
 618         i = ctx->cipher->do_cipher(ctx, out, in, inl);
 619         if (i < 0)
 620             return 0;
 621         else
 622             *outl = i;
 623         return 1;
 624     }
 625
 626     if (inl <= 0) {
 627         *outl = 0;
 628         return inl == 0;
 629     }
 630     if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
 631         EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 632         return 0;
 633     }
 634
 635     if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
 636         if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
 637             *outl = inl;
 638             return 1;
 639         } else {
 640             *outl = 0;
 641             return 0;
 642         }
 643     }
 644     i = ctx->buf_len;
 645     OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
 646     if (i != 0) {
 647         if (bl - i > inl) {
 648             memcpy(&(ctx->buf[i]), in, inl);
 649             ctx->buf_len += inl;
 650             *outl = 0;
 651             return 1;
 652         } else {
 653             j = bl - i;
 654             memcpy(&(ctx->buf[i]), in, j);
 655             inl -= j;
 656             in += j;
 657             if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
 658                 return 0;
 659             out += bl;
 660             *outl = bl;
 661         }
 662     } else
 663         *outl = 0;
 664     i = inl & (bl - 1);
 665     inl -= i;
 666     if (inl > 0) {
 667         if (!ctx->cipher->do_cipher(ctx, out, in, inl))
 668             return 0;
 669         *outl += inl;
 670     }
 671
 672     if (i != 0)
 673         memcpy(ctx->buf, &(in[inl]), i);
 674     ctx->buf_len = i;
 675     return 1;
 676 }
 677
 678
 679 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 680                       const unsigned char *in, int inl)
 681 {
 682     int ret;
 683     size_t soutl;
 684     int blocksize;
 685
 686     /* Prevent accidental use of decryption context when encrypting */
 687     if (!ctx->encrypt) {
 688         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
 689         return 0;
 690     }
 691
 692     if (ctx->cipher == NULL) {
 693         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 694         return 0;
 695     }
 696
 697     if (ctx->cipher->prov == NULL)
 698         goto legacy;
 699
 700     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 701
 702     if (ctx->cipher->cupdate == NULL  || blocksize < 1) {
 703         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 704         return 0;
 705     }
 706     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 707                                inl + (blocksize == 1 ? 0 : blocksize), in,
 708                                (size_t)inl);
 709
 710     if (ret) {
 711         if (soutl > INT_MAX) {
 712             EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 713             return 0;
 714         }
 715         *outl = soutl;
 716     }
 717
 718     return ret;
 719
 720     /* TODO(3.0): Remove legacy code below */
 721  legacy:
 722
 723     return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 724 }
 725
 726 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 727 {
 728     int ret;
 729     ret = EVP_EncryptFinal_ex(ctx, out, outl);
 730     return ret;
 731 }
 732
 733 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 734 {
 735     int n, ret;
 736     unsigned int i, b, bl;
 737     size_t soutl;
 738     int blocksize;
 739
 740     /* Prevent accidental use of decryption context when encrypting */
 741     if (!ctx->encrypt) {
 742         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 743         return 0;
 744     }
 745
 746     if (ctx->cipher == NULL) {
 747         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 748         return 0;
 749     }
 750     if (ctx->cipher->prov == NULL)
 751         goto legacy;
 752
 753     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 754
 755     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 756         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 757         return 0;
 758     }
 759
 760     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 761                               blocksize == 1 ? 0 : blocksize);
 762
 763     if (ret) {
 764         if (soutl > INT_MAX) {
 765             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 766             return 0;
 767         }
 768         *outl = soutl;
 769     }
 770
 771     return ret;
 772
 773     /* TODO(3.0): Remove legacy code below */
 774  legacy:
 775
 776     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 777         ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 778         if (ret < 0)
 779             return 0;
 780         else
 781             *outl = ret;
 782         return 1;
 783     }
 784
 785     b = ctx->cipher->block_size;
 786     OPENSSL_assert(b <= sizeof(ctx->buf));
 787     if (b == 1) {
 788         *outl = 0;
 789         return 1;
 790     }
 791     bl = ctx->buf_len;
 792     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 793         if (bl) {
 794             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
 795                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 796             return 0;
 797         }
 798         *outl = 0;
 799         return 1;
 800     }
 801
 802     n = b - bl;
 803     for (i = bl; i < b; i++)
 804         ctx->buf[i] = n;
 805     ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
 806
 807     if (ret)
 808         *outl = b;
 809
 810     return ret;
 811 }
 812
 813 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 814                       const unsigned char *in, int inl)
 815 {
 816     int fix_len, cmpl = inl, ret;
 817     unsigned int b;
 818     size_t soutl;
 819     int blocksize;
 820
 821     /* Prevent accidental use of encryption context when decrypting */
 822     if (ctx->encrypt) {
 823         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
 824         return 0;
 825     }
 826
 827     if (ctx->cipher == NULL) {
 828         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 829         return 0;
 830     }
 831     if (ctx->cipher->prov == NULL)
 832         goto legacy;
 833
 834     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 835
 836     if (ctx->cipher->cupdate == NULL || blocksize < 1) {
 837         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 838         return 0;
 839     }
 840     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 841                                inl + (blocksize == 1 ? 0 : blocksize), in,
 842                                (size_t)inl);
 843
 844     if (ret) {
 845         if (soutl > INT_MAX) {
 846             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 847             return 0;
 848         }
 849         *outl = soutl;
 850     }
 851
 852     return ret;
 853
 854     /* TODO(3.0): Remove legacy code below */
 855  legacy:
 856
 857     b = ctx->cipher->block_size;
 858
 859     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 860         cmpl = (cmpl + 7) / 8;
 861
 862     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 863         if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
 864             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 865             return 0;
 866         }
 867
 868         fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
 869         if (fix_len < 0) {
 870             *outl = 0;
 871             return 0;
 872         } else
 873             *outl = fix_len;
 874         return 1;
 875     }
 876
 877     if (inl <= 0) {
 878         *outl = 0;
 879         return inl == 0;
 880     }
 881
 882     if (ctx->flags & EVP_CIPH_NO_PADDING)
 883         return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 884
 885     OPENSSL_assert(b <= sizeof(ctx->final));
 886
 887     if (ctx->final_used) {
 888         /* see comment about PTRDIFF_T comparison above */
 889         if (((PTRDIFF_T)out == (PTRDIFF_T)in)
 890             || is_partially_overlapping(out, in, b)) {
 891             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 892             return 0;
 893         }
 894         memcpy(out, ctx->final, b);
 895         out += b;
 896         fix_len = 1;
 897     } else
 898         fix_len = 0;
 899
 900     if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
 901         return 0;
 902
 903     /*
 904      * if we have 'decrypted' a multiple of block size, make sure we have a
 905      * copy of this last block
 906      */
 907     if (b > 1 && !ctx->buf_len) {
 908         *outl -= b;
 909         ctx->final_used = 1;
 910         memcpy(ctx->final, &out[*outl], b);
 911     } else
 912         ctx->final_used = 0;
 913
 914     if (fix_len)
 915         *outl += b;
 916
 917     return 1;
 918 }
 919
 920 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 921 {
 922     int ret;
 923     ret = EVP_DecryptFinal_ex(ctx, out, outl);
 924     return ret;
 925 }
 926
 927 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 928 {
 929     int i, n;
 930     unsigned int b;
 931     size_t soutl;
 932     int ret;
 933     int blocksize;
 934
 935     /* Prevent accidental use of encryption context when decrypting */
 936     if (ctx->encrypt) {
 937         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 938         return 0;
 939     }
 940
 941     if (ctx->cipher == NULL) {
 942         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 943         return 0;
 944     }
 945
 946     if (ctx->cipher->prov == NULL)
 947         goto legacy;
 948
 949     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 950
 951     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 952         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 953         return 0;
 954     }
 955
 956     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 957                               blocksize == 1 ? 0 : blocksize);
 958
 959     if (ret) {
 960         if (soutl > INT_MAX) {
 961             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 962             return 0;
 963         }
 964         *outl = soutl;
 965     }
 966
 967     return ret;
 968
 969     /* TODO(3.0): Remove legacy code below */
 970  legacy:
 971
 972     *outl = 0;
 973     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 974         i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 975         if (i < 0)
 976             return 0;
 977         else
 978             *outl = i;
 979         return 1;
 980     }
 981
 982     b = ctx->cipher->block_size;
 983     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 984         if (ctx->buf_len) {
 985             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
 986                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 987             return 0;
 988         }
 989         *outl = 0;
 990         return 1;
 991     }
 992     if (b > 1) {
 993         if (ctx->buf_len || !ctx->final_used) {
 994             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 995             return 0;
 996         }
 997         OPENSSL_assert(b <= sizeof(ctx->final));
 998
 999         /*
1000          * The following assumes that the ciphertext has been authenticated.
1001          * Otherwise it provides a padding oracle.
1002          */
1003         n = ctx->final[b - 1];
1004         if (n == 0 || n > (int)b) {
1005             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
1006             return 0;
1007         }
1008         for (i = 0; i < n; i++) {
1009             if (ctx->final[--b] != n) {
1010                 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
1011                 return 0;
1012             }
1013         }
1014         n = ctx->cipher->block_size - n;
1015         for (i = 0; i < n; i++)
1016             out[i] = ctx->final[i];
1017         *outl = n;
1018     } else
1019         *outl = 0;
1020     return 1;
1021 }
1022
1023 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
1024 {
1025     int ok;
1026     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1027     size_t len = keylen;
1028
1029     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
1030     ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
1031
1032     if (ok != EVP_CTRL_RET_UNSUPPORTED)
1033         return ok;
1034
1035     /* TODO(3.0) legacy code follows */
1036     if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
1037         return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
1038     if (EVP_CIPHER_CTX_key_length(c) == keylen)
1039         return 1;
1040     if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
1041         c->key_len = keylen;
1042         return 1;
1043     }
1044     EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
1045     return 0;
1046 }
1047
1048 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
1049 {
1050     int ok;
1051     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1052     unsigned int pd = pad;
1053
1054     if (pad)
1055         ctx->flags &= ~EVP_CIPH_NO_PADDING;
1056     else
1057         ctx->flags |= EVP_CIPH_NO_PADDING;
1058
1059     params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
1060     ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1061
1062     return ok != 0;
1063 }
1064
1065 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
1066 {
1067     int ret = EVP_CTRL_RET_UNSUPPORTED;
1068     int set_params = 1;
1069     size_t sz = arg;
1070     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1071
1072     if (ctx == NULL || ctx->cipher == NULL) {
1073         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
1074         return 0;
1075     }
1076
1077     if (ctx->cipher->prov == NULL)
1078         goto legacy;
1079
1080     switch (type) {
1081     case EVP_CTRL_SET_KEY_LENGTH:
1082         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
1083         break;
1084     case EVP_CTRL_RAND_KEY:      /* Used by DES */
1085         set_params = 0;
1086         params[0] =
1087             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
1088                                               ptr, sz);
1089         break;
1090
1091     case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
1092     case EVP_CTRL_INIT: /* TODO(3.0) Purely legacy, no provider counterpart */
1093     default:
1094         return EVP_CTRL_RET_UNSUPPORTED;
1095     case EVP_CTRL_GET_IV:
1096         set_params = 0;
1097         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
1098                                                       ptr, sz);
1099         break;
1100     case EVP_CTRL_AEAD_SET_IVLEN:
1101         if (arg < 0)
1102             return 0;
1103         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
1104         break;
1105     case EVP_CTRL_GCM_SET_IV_FIXED:
1106         params[0] =
1107             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED,
1108                                               ptr, sz);
1109         break;
1110     case EVP_CTRL_AEAD_GET_TAG:
1111         set_params = 0; /* Fall thru */
1112     case EVP_CTRL_AEAD_SET_TAG:
1113         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1114                                                       ptr, sz);
1115         break;
1116     case EVP_CTRL_AEAD_TLS1_AAD:
1117         /* This one does a set and a get - since it returns a padding size */
1118         params[0] =
1119             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1120                                               ptr, sz);
1121         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1122         if (ret <= 0)
1123             return ret;
1124         params[0] =
1125             OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1126         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1127         if (ret <= 0)
1128             return 0;
1129         return sz;
1130     }
1131
1132     if (set_params)
1133         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1134     else
1135         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1136     return ret;
1137
1138 /* TODO(3.0): Remove legacy code below */
1139 legacy:
1140     if (ctx->cipher->ctrl == NULL) {
1141         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1142         return 0;
1143     }
1144
1145     ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1146     if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1147         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1148                EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1149         return 0;
1150     }
1151     return ret;
1152 }
1153
1154 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1155 {
1156     if (cipher != NULL && cipher->get_params != NULL)
1157         return cipher->get_params(params);
1158     return 0;
1159 }
1160
1161 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1162 {
1163     if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1164         return ctx->cipher->set_ctx_params(ctx->provctx, params);
1165     return 0;
1166 }
1167
1168 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1169 {
1170     if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1171         return ctx->cipher->get_ctx_params(ctx->provctx, params);
1172     return 0;
1173 }
1174
1175 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1176 {
1177     if (cipher != NULL && cipher->gettable_params != NULL)
1178         return cipher->gettable_params();
1179     return NULL;
1180 }
1181
1182 const OSSL_PARAM *EVP_CIPHER_CTX_settable_params(const EVP_CIPHER *cipher)
1183 {
1184     if (cipher != NULL && cipher->settable_ctx_params != NULL)
1185         return cipher->settable_ctx_params();
1186     return NULL;
1187 }
1188
1189 const OSSL_PARAM *EVP_CIPHER_CTX_gettable_params(const EVP_CIPHER *cipher)
1190 {
1191     if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1192         return cipher->gettable_ctx_params();
1193     return NULL;
1194 }
1195
1196 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1197 {
1198     if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1199         return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1200
1201 #ifdef FIPS_MODE
1202     return 0;
1203 #else
1204     {
1205         int kl;
1206
1207         kl = EVP_CIPHER_CTX_key_length(ctx);
1208         if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1209             return 0;
1210         return 1;
1211     }
1212 #endif /* FIPS_MODE */
1213 }
1214
1215 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1216 {
1217     if ((in == NULL) || (in->cipher == NULL)) {
1218         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1219         return 0;
1220     }
1221
1222     if (in->cipher->prov == NULL)
1223         goto legacy;
1224
1225     if (in->cipher->dupctx == NULL) {
1226         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1227         return 0;
1228     }
1229
1230     EVP_CIPHER_CTX_reset(out);
1231
1232     *out = *in;
1233     out->provctx = NULL;
1234
1235     if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1236         out->fetched_cipher = NULL;
1237         return 0;
1238     }
1239
1240     out->provctx = in->cipher->dupctx(in->provctx);
1241     if (out->provctx == NULL) {
1242         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1243         return 0;
1244     }
1245
1246     return 1;
1247
1248     /* TODO(3.0): Remove legacy code below */
1249  legacy:
1250
1251 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1252     /* Make sure it's safe to copy a cipher context using an ENGINE */
1253     if (in->engine && !ENGINE_init(in->engine)) {
1254         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1255         return 0;
1256     }
1257 #endif
1258
1259     EVP_CIPHER_CTX_reset(out);
1260     memcpy(out, in, sizeof(*out));
1261
1262     if (in->cipher_data && in->cipher->ctx_size) {
1263         out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1264         if (out->cipher_data == NULL) {
1265             out->cipher = NULL;
1266             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1267             return 0;
1268         }
1269         memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1270     }
1271
1272     if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1273         if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1274             out->cipher = NULL;
1275             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1276             return 0;
1277         }
1278     return 1;
1279 }
1280
1281 EVP_CIPHER *evp_cipher_new(void)
1282 {
1283     EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1284
1285     if (cipher != NULL) {
1286         cipher->lock = CRYPTO_THREAD_lock_new();
1287         if (cipher->lock == NULL) {
1288             OPENSSL_free(cipher);
1289             return NULL;
1290         }
1291         cipher->refcnt = 1;
1292     }
1293     return cipher;
1294 }
1295
1296 static void *evp_cipher_from_dispatch(const int name_id,
1297                                       const OSSL_DISPATCH *fns,
1298                                       OSSL_PROVIDER *prov,
1299                                       void *unused)
1300 {
1301     EVP_CIPHER *cipher = NULL;
1302     int fnciphcnt = 0, fnctxcnt = 0;
1303
1304     if ((cipher = evp_cipher_new()) == NULL) {
1305         EVPerr(0, ERR_R_MALLOC_FAILURE);
1306         return NULL;
1307     }
1308     cipher->name_id = name_id;
1309
1310 #ifndef FIPS_MODE
1311     {
1312         /*
1313          * FIPS module note: since internal fetches will be entirely
1314          * provider based, we know that none of its code depends on legacy
1315          * NIDs or any functionality that use them.
1316          *
1317          * TODO(3.x) get rid of the need for legacy NIDs
1318          */
1319         cipher->nid = OBJ_sn2nid(evp_first_name(prov, name_id));
1320     }
1321 #endif
1322
1323     for (; fns->function_id != 0; fns++) {
1324         switch (fns->function_id) {
1325         case OSSL_FUNC_CIPHER_NEWCTX:
1326             if (cipher->newctx != NULL)
1327                 break;
1328             cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1329             fnctxcnt++;
1330             break;
1331         case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1332             if (cipher->einit != NULL)
1333                 break;
1334             cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1335             fnciphcnt++;
1336             break;
1337         case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1338             if (cipher->dinit != NULL)
1339                 break;
1340             cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1341             fnciphcnt++;
1342             break;
1343         case OSSL_FUNC_CIPHER_UPDATE:
1344             if (cipher->cupdate != NULL)
1345                 break;
1346             cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1347             fnciphcnt++;
1348             break;
1349         case OSSL_FUNC_CIPHER_FINAL:
1350             if (cipher->cfinal != NULL)
1351                 break;
1352             cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1353             fnciphcnt++;
1354             break;
1355         case OSSL_FUNC_CIPHER_CIPHER:
1356             if (cipher->ccipher != NULL)
1357                 break;
1358             cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1359             break;
1360         case OSSL_FUNC_CIPHER_FREECTX:
1361             if (cipher->freectx != NULL)
1362                 break;
1363             cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1364             fnctxcnt++;
1365             break;
1366         case OSSL_FUNC_CIPHER_DUPCTX:
1367             if (cipher->dupctx != NULL)
1368                 break;
1369             cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1370             break;
1371         case OSSL_FUNC_CIPHER_GET_PARAMS:
1372             if (cipher->get_params != NULL)
1373                 break;
1374             cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1375             break;
1376         case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1377             if (cipher->get_ctx_params != NULL)
1378                 break;
1379             cipher->get_ctx_params = OSSL_get_OP_cipher_get_ctx_params(fns);
1380             break;
1381         case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1382             if (cipher->set_ctx_params != NULL)
1383                 break;
1384             cipher->set_ctx_params = OSSL_get_OP_cipher_set_ctx_params(fns);
1385             break;
1386         case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1387             if (cipher->gettable_params != NULL)
1388                 break;
1389             cipher->gettable_params = OSSL_get_OP_cipher_gettable_params(fns);
1390             break;
1391         case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1392             if (cipher->gettable_ctx_params != NULL)
1393                 break;
1394             cipher->gettable_ctx_params =
1395                 OSSL_get_OP_cipher_gettable_ctx_params(fns);
1396             break;
1397         case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1398             if (cipher->settable_ctx_params != NULL)
1399                 break;
1400             cipher->settable_ctx_params =
1401                 OSSL_get_OP_cipher_settable_ctx_params(fns);
1402             break;
1403         }
1404     }
1405     if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1406             || (fnciphcnt == 0 && cipher->ccipher == NULL)
1407             || fnctxcnt != 2) {
1408         /*
1409          * In order to be a consistent set of functions we must have at least
1410          * a complete set of "encrypt" functions, or a complete set of "decrypt"
1411          * functions, or a single "cipher" function. In all cases we need both
1412          * the "newctx" and "freectx" functions.
1413          */
1414         EVP_CIPHER_free(cipher);
1415         EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1416         return NULL;
1417     }
1418     cipher->prov = prov;
1419     if (prov != NULL)
1420         ossl_provider_up_ref(prov);
1421
1422     return cipher;
1423 }
1424
1425 static int evp_cipher_up_ref(void *cipher)
1426 {
1427     return EVP_CIPHER_up_ref(cipher);
1428 }
1429
1430 static void evp_cipher_free(void *cipher)
1431 {
1432     EVP_CIPHER_free(cipher);
1433 }
1434
1435 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1436                              const char *properties)
1437 {
1438     EVP_CIPHER *cipher =
1439         evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1440                           evp_cipher_from_dispatch, NULL, evp_cipher_up_ref,
1441                           evp_cipher_free);
1442
1443     return cipher;
1444 }
1445
1446 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1447 {
1448     int ref = 0;
1449
1450     CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1451     return 1;
1452 }
1453
1454 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1455 {
1456     int i;
1457
1458     if (cipher == NULL)
1459         return;
1460
1461     CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1462     if (i > 0)
1463         return;
1464     ossl_provider_free(cipher->prov);
1465     CRYPTO_THREAD_lock_free(cipher->lock);
1466     OPENSSL_free(cipher);
1467 }
1468
1469 void EVP_CIPHER_do_all_ex(OPENSSL_CTX *libctx,
1470                           void (*fn)(EVP_CIPHER *mac, void *arg),
1471                           void *arg)
1472 {
1473     evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1474                        (void (*)(void *, void *))fn, arg,
1475                        evp_cipher_from_dispatch, NULL, evp_cipher_free);
1476 }