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 "crypto/evp.h"
  21 #include "internal/provider.h"
  22 #include "evp_local.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_aes_256_siv:
 175         case NID_aes_192_siv:
 176         case NID_aes_128_siv:
 177         case NID_id_aes256_wrap:
 178         case NID_id_aes256_wrap_pad:
 179         case NID_id_aes192_wrap:
 180         case NID_id_aes192_wrap_pad:
 181         case NID_id_aes128_wrap:
 182         case NID_id_aes128_wrap_pad:
 183         case NID_aria_256_gcm:
 184         case NID_aria_192_gcm:
 185         case NID_aria_128_gcm:
 186         case NID_aes_256_ccm:
 187         case NID_aes_192_ccm:
 188         case NID_aes_128_ccm:
 189         case NID_aria_256_ccm:
 190         case NID_aria_192_ccm:
 191         case NID_aria_128_ccm:
 192         case NID_aria_256_ecb:
 193         case NID_aria_192_ecb:
 194         case NID_aria_128_ecb:
 195         case NID_aria_256_cbc:
 196         case NID_aria_192_cbc:
 197         case NID_aria_128_cbc:
 198         case NID_aria_256_ofb128:
 199         case NID_aria_192_ofb128:
 200         case NID_aria_128_ofb128:
 201         case NID_aria_256_cfb128:
 202         case NID_aria_192_cfb128:
 203         case NID_aria_128_cfb128:
 204         case NID_aria_256_cfb1:
 205         case NID_aria_192_cfb1:
 206         case NID_aria_128_cfb1:
 207         case NID_aria_256_cfb8:
 208         case NID_aria_192_cfb8:
 209         case NID_aria_128_cfb8:
 210         case NID_aria_256_ctr:
 211         case NID_aria_192_ctr:
 212         case NID_aria_128_ctr:
 213         case NID_camellia_256_ecb:
 214         case NID_camellia_192_ecb:
 215         case NID_camellia_128_ecb:
 216         case NID_camellia_256_cbc:
 217         case NID_camellia_192_cbc:
 218         case NID_camellia_128_cbc:
 219         case NID_camellia_256_ofb128:
 220         case NID_camellia_192_ofb128:
 221         case NID_camellia_128_ofb128:
 222         case NID_camellia_256_cfb128:
 223         case NID_camellia_192_cfb128:
 224         case NID_camellia_128_cfb128:
 225         case NID_camellia_256_cfb1:
 226         case NID_camellia_192_cfb1:
 227         case NID_camellia_128_cfb1:
 228         case NID_camellia_256_cfb8:
 229         case NID_camellia_192_cfb8:
 230         case NID_camellia_128_cfb8:
 231         case NID_camellia_256_ctr:
 232         case NID_camellia_192_ctr:
 233         case NID_camellia_128_ctr:
 234         case NID_des_ede3_cbc:
 235         case NID_des_ede3_ecb:
 236         case NID_des_ede3_ofb64:
 237         case NID_des_ede3_cfb64:
 238         case NID_des_ede3_cfb8:
 239         case NID_des_ede3_cfb1:
 240         case NID_des_ede_cbc:
 241         case NID_des_ede_ecb:
 242         case NID_des_ede_ofb64:
 243         case NID_des_ede_cfb64:
 244         case NID_desx_cbc:
 245         case NID_des_cbc:
 246         case NID_des_ecb:
 247         case NID_des_cfb1:
 248         case NID_des_cfb8:
 249         case NID_des_cfb64:
 250         case NID_des_ofb64:
 251         case NID_id_smime_alg_CMS3DESwrap:
 252         case NID_bf_cbc:
 253         case NID_bf_ecb:
 254         case NID_bf_cfb64:
 255         case NID_bf_ofb64:
 256         case NID_idea_cbc:
 257         case NID_idea_ecb:
 258         case NID_idea_cfb64:
 259         case NID_idea_ofb64:
 260         case NID_cast5_cbc:
 261         case NID_cast5_ecb:
 262         case NID_cast5_cfb64:
 263         case NID_cast5_ofb64:
 264         case NID_seed_cbc:
 265         case NID_seed_ecb:
 266         case NID_seed_cfb128:
 267         case NID_seed_ofb128:
 268         case NID_sm4_cbc:
 269         case NID_sm4_ecb:
 270         case NID_sm4_ctr:
 271         case NID_sm4_cfb128:
 272         case NID_sm4_ofb128:
 273         case NID_rc4:
 274         case NID_rc4_40:
 275         case NID_rc5_cbc:
 276         case NID_rc5_ecb:
 277         case NID_rc5_cfb64:
 278         case NID_rc5_ofb64:
 279         case NID_rc2_cbc:
 280         case NID_rc2_40_cbc:
 281         case NID_rc2_64_cbc:
 282         case NID_rc2_cfb64:
 283         case NID_rc2_ofb64:
 284         case NID_chacha20:
 285         case NID_chacha20_poly1305:
 286         case NID_rc4_hmac_md5:
 287             break;
 288         default:
 289             goto legacy;
 290         }
 291     }
 292
 293     /*
 294      * Ensure a context left lying around from last time is cleared
 295      * (legacy code)
 296      */
 297     if (cipher != NULL && ctx->cipher != NULL) {
 298         OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
 299         ctx->cipher_data = NULL;
 300     }
 301
 302
 303     /* TODO(3.0): Start of non-legacy code below */
 304
 305     /* Ensure a context left lying around from last time is cleared */
 306     if (cipher != NULL && ctx->cipher != NULL) {
 307         unsigned long flags = ctx->flags;
 308
 309         EVP_CIPHER_CTX_reset(ctx);
 310         /* Restore encrypt and flags */
 311         ctx->encrypt = enc;
 312         ctx->flags = flags;
 313     }
 314
 315     if (cipher == NULL)
 316         cipher = ctx->cipher;
 317
 318     if (cipher->prov == NULL) {
 319 #ifdef FIPS_MODE
 320         /* We only do explict fetches inside the FIPS module */
 321         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 322         return 0;
 323 #else
 324         EVP_CIPHER *provciph =
 325             EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
 326
 327         if (provciph == NULL) {
 328             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 329             return 0;
 330         }
 331         cipher = provciph;
 332         EVP_CIPHER_free(ctx->fetched_cipher);
 333         ctx->fetched_cipher = provciph;
 334 #endif
 335     }
 336
 337     ctx->cipher = cipher;
 338     if (ctx->provctx == NULL) {
 339         ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
 340         if (ctx->provctx == NULL) {
 341             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 342             return 0;
 343         }
 344     }
 345
 346     if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
 347         /*
 348          * If this ctx was already set up for no padding then we need to tell
 349          * the new cipher about it.
 350          */
 351         if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
 352             return 0;
 353     }
 354
 355     if (enc) {
 356         if (ctx->cipher->einit == NULL) {
 357             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 358             return 0;
 359         }
 360
 361         return ctx->cipher->einit(ctx->provctx,
 362                                   key,
 363                                   key == NULL ? 0
 364                                               : EVP_CIPHER_CTX_key_length(ctx),
 365                                   iv,
 366                                   iv == NULL ? 0
 367                                              : EVP_CIPHER_CTX_iv_length(ctx));
 368     }
 369
 370     if (ctx->cipher->dinit == NULL) {
 371         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 372         return 0;
 373     }
 374
 375     return ctx->cipher->dinit(ctx->provctx,
 376                               key,
 377                               key == NULL ? 0
 378                                           : EVP_CIPHER_CTX_key_length(ctx),
 379                               iv,
 380                               iv == NULL ? 0
 381                                          : EVP_CIPHER_CTX_iv_length(ctx));
 382
 383     /* TODO(3.0): Remove legacy code below */
 384  legacy:
 385
 386     if (cipher != NULL) {
 387         /*
 388          * Ensure a context left lying around from last time is cleared (we
 389          * previously attempted to avoid this if the same ENGINE and
 390          * EVP_CIPHER could be used).
 391          */
 392         if (ctx->cipher) {
 393             unsigned long flags = ctx->flags;
 394             EVP_CIPHER_CTX_reset(ctx);
 395             /* Restore encrypt and flags */
 396             ctx->encrypt = enc;
 397             ctx->flags = flags;
 398         }
 399 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 400         if (impl != NULL) {
 401             if (!ENGINE_init(impl)) {
 402                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 403                 return 0;
 404             }
 405         } else {
 406             impl = tmpimpl;
 407         }
 408         if (impl != NULL) {
 409             /* There's an ENGINE for this job ... (apparently) */
 410             const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
 411
 412             if (c == NULL) {
 413                 /*
 414                  * One positive side-effect of US's export control history,
 415                  * is that we should at least be able to avoid using US
 416                  * misspellings of "initialisation"?
 417                  */
 418                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 419                 return 0;
 420             }
 421             /* We'll use the ENGINE's private cipher definition */
 422             cipher = c;
 423             /*
 424              * Store the ENGINE functional reference so we know 'cipher' came
 425              * from an ENGINE and we need to release it when done.
 426              */
 427             ctx->engine = impl;
 428         } else {
 429             ctx->engine = NULL;
 430         }
 431 #endif
 432
 433         ctx->cipher = cipher;
 434         if (ctx->cipher->ctx_size) {
 435             ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
 436             if (ctx->cipher_data == NULL) {
 437                 ctx->cipher = NULL;
 438                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
 439                 return 0;
 440             }
 441         } else {
 442             ctx->cipher_data = NULL;
 443         }
 444         ctx->key_len = cipher->key_len;
 445         /* Preserve wrap enable flag, zero everything else */
 446         ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
 447         if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
 448             if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
 449                 ctx->cipher = NULL;
 450                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 451                 return 0;
 452             }
 453         }
 454     }
 455 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
 456  skip_to_init:
 457 #endif
 458     if (ctx->cipher == NULL)
 459         return 0;
 460
 461     /* we assume block size is a power of 2 in *cryptUpdate */
 462     OPENSSL_assert(ctx->cipher->block_size == 1
 463                    || ctx->cipher->block_size == 8
 464                    || ctx->cipher->block_size == 16);
 465
 466     if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
 467         && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
 468         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
 469         return 0;
 470     }
 471
 472     if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
 473         switch (EVP_CIPHER_CTX_mode(ctx)) {
 474
 475         case EVP_CIPH_STREAM_CIPHER:
 476         case EVP_CIPH_ECB_MODE:
 477             break;
 478
 479         case EVP_CIPH_CFB_MODE:
 480         case EVP_CIPH_OFB_MODE:
 481
 482             ctx->num = 0;
 483             /* fall-through */
 484
 485         case EVP_CIPH_CBC_MODE:
 486
 487             OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
 488                            (int)sizeof(ctx->iv));
 489             if (iv)
 490                 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 491             memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
 492             break;
 493
 494         case EVP_CIPH_CTR_MODE:
 495             ctx->num = 0;
 496             /* Don't reuse IV for CTR mode */
 497             if (iv)
 498                 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 499             break;
 500
 501         default:
 502             return 0;
 503         }
 504     }
 505
 506     if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 507         if (!ctx->cipher->init(ctx, key, iv, enc))
 508             return 0;
 509     }
 510     ctx->buf_len = 0;
 511     ctx->final_used = 0;
 512     ctx->block_mask = ctx->cipher->block_size - 1;
 513     return 1;
 514 }
 515
 516 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 517                      const unsigned char *in, int inl)
 518 {
 519     if (ctx->encrypt)
 520         return EVP_EncryptUpdate(ctx, out, outl, in, inl);
 521     else
 522         return EVP_DecryptUpdate(ctx, out, outl, in, inl);
 523 }
 524
 525 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 526 {
 527     if (ctx->encrypt)
 528         return EVP_EncryptFinal_ex(ctx, out, outl);
 529     else
 530         return EVP_DecryptFinal_ex(ctx, out, outl);
 531 }
 532
 533 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 534 {
 535     if (ctx->encrypt)
 536         return EVP_EncryptFinal(ctx, out, outl);
 537     else
 538         return EVP_DecryptFinal(ctx, out, outl);
 539 }
 540
 541 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 542                     const unsigned char *key, const unsigned char *iv)
 543 {
 544     return EVP_CipherInit(ctx, cipher, key, iv, 1);
 545 }
 546
 547 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 548                        ENGINE *impl, const unsigned char *key,
 549                        const unsigned char *iv)
 550 {
 551     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 552 }
 553
 554 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 555                     const unsigned char *key, const unsigned char *iv)
 556 {
 557     return EVP_CipherInit(ctx, cipher, key, iv, 0);
 558 }
 559
 560 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 561                        ENGINE *impl, const unsigned char *key,
 562                        const unsigned char *iv)
 563 {
 564     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 565 }
 566
 567 /*
 568  * According to the letter of standard difference between pointers
 569  * is specified to be valid only within same object. This makes
 570  * it formally challenging to determine if input and output buffers
 571  * are not partially overlapping with standard pointer arithmetic.
 572  */
 573 #ifdef PTRDIFF_T
 574 # undef PTRDIFF_T
 575 #endif
 576 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
 577 /*
 578  * Then we have VMS that distinguishes itself by adhering to
 579  * sizeof(size_t)==4 even in 64-bit builds, which means that
 580  * difference between two pointers might be truncated to 32 bits.
 581  * In the context one can even wonder how comparison for
 582  * equality is implemented. To be on the safe side we adhere to
 583  * PTRDIFF_T even for comparison for equality.
 584  */
 585 # define PTRDIFF_T uint64_t
 586 #else
 587 # define PTRDIFF_T size_t
 588 #endif
 589
 590 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
 591 {
 592     PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
 593     /*
 594      * Check for partially overlapping buffers. [Binary logical
 595      * operations are used instead of boolean to minimize number
 596      * of conditional branches.]
 597      */
 598     int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
 599                                                 (diff > (0 - (PTRDIFF_T)len)));
 600
 601     return overlapped;
 602 }
 603
 604 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
 605                                     unsigned char *out, int *outl,
 606                                     const unsigned char *in, int inl)
 607 {
 608     int i, j, bl, cmpl = inl;
 609
 610     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 611         cmpl = (cmpl + 7) / 8;
 612
 613     bl = ctx->cipher->block_size;
 614
 615     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 616         /* If block size > 1 then the cipher will have to do this check */
 617         if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
 618             EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 619             return 0;
 620         }
 621
 622         i = ctx->cipher->do_cipher(ctx, out, in, inl);
 623         if (i < 0)
 624             return 0;
 625         else
 626             *outl = i;
 627         return 1;
 628     }
 629
 630     if (inl <= 0) {
 631         *outl = 0;
 632         return inl == 0;
 633     }
 634     if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
 635         EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 636         return 0;
 637     }
 638
 639     if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
 640         if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
 641             *outl = inl;
 642             return 1;
 643         } else {
 644             *outl = 0;
 645             return 0;
 646         }
 647     }
 648     i = ctx->buf_len;
 649     OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
 650     if (i != 0) {
 651         if (bl - i > inl) {
 652             memcpy(&(ctx->buf[i]), in, inl);
 653             ctx->buf_len += inl;
 654             *outl = 0;
 655             return 1;
 656         } else {
 657             j = bl - i;
 658             memcpy(&(ctx->buf[i]), in, j);
 659             inl -= j;
 660             in += j;
 661             if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
 662                 return 0;
 663             out += bl;
 664             *outl = bl;
 665         }
 666     } else
 667         *outl = 0;
 668     i = inl & (bl - 1);
 669     inl -= i;
 670     if (inl > 0) {
 671         if (!ctx->cipher->do_cipher(ctx, out, in, inl))
 672             return 0;
 673         *outl += inl;
 674     }
 675
 676     if (i != 0)
 677         memcpy(ctx->buf, &(in[inl]), i);
 678     ctx->buf_len = i;
 679     return 1;
 680 }
 681
 682
 683 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 684                       const unsigned char *in, int inl)
 685 {
 686     int ret;
 687     size_t soutl;
 688     int blocksize;
 689
 690     /* Prevent accidental use of decryption context when encrypting */
 691     if (!ctx->encrypt) {
 692         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
 693         return 0;
 694     }
 695
 696     if (ctx->cipher == NULL) {
 697         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 698         return 0;
 699     }
 700
 701     if (ctx->cipher->prov == NULL)
 702         goto legacy;
 703
 704     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 705
 706     if (ctx->cipher->cupdate == NULL  || blocksize < 1) {
 707         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 708         return 0;
 709     }
 710     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 711                                inl + (blocksize == 1 ? 0 : blocksize), in,
 712                                (size_t)inl);
 713
 714     if (ret) {
 715         if (soutl > INT_MAX) {
 716             EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 717             return 0;
 718         }
 719         *outl = soutl;
 720     }
 721
 722     return ret;
 723
 724     /* TODO(3.0): Remove legacy code below */
 725  legacy:
 726
 727     return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 728 }
 729
 730 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 731 {
 732     int ret;
 733     ret = EVP_EncryptFinal_ex(ctx, out, outl);
 734     return ret;
 735 }
 736
 737 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 738 {
 739     int n, ret;
 740     unsigned int i, b, bl;
 741     size_t soutl;
 742     int blocksize;
 743
 744     /* Prevent accidental use of decryption context when encrypting */
 745     if (!ctx->encrypt) {
 746         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 747         return 0;
 748     }
 749
 750     if (ctx->cipher == NULL) {
 751         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 752         return 0;
 753     }
 754     if (ctx->cipher->prov == NULL)
 755         goto legacy;
 756
 757     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 758
 759     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 760         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 761         return 0;
 762     }
 763
 764     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 765                               blocksize == 1 ? 0 : blocksize);
 766
 767     if (ret) {
 768         if (soutl > INT_MAX) {
 769             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 770             return 0;
 771         }
 772         *outl = soutl;
 773     }
 774
 775     return ret;
 776
 777     /* TODO(3.0): Remove legacy code below */
 778  legacy:
 779
 780     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 781         ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 782         if (ret < 0)
 783             return 0;
 784         else
 785             *outl = ret;
 786         return 1;
 787     }
 788
 789     b = ctx->cipher->block_size;
 790     OPENSSL_assert(b <= sizeof(ctx->buf));
 791     if (b == 1) {
 792         *outl = 0;
 793         return 1;
 794     }
 795     bl = ctx->buf_len;
 796     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 797         if (bl) {
 798             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
 799                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 800             return 0;
 801         }
 802         *outl = 0;
 803         return 1;
 804     }
 805
 806     n = b - bl;
 807     for (i = bl; i < b; i++)
 808         ctx->buf[i] = n;
 809     ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
 810
 811     if (ret)
 812         *outl = b;
 813
 814     return ret;
 815 }
 816
 817 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 818                       const unsigned char *in, int inl)
 819 {
 820     int fix_len, cmpl = inl, ret;
 821     unsigned int b;
 822     size_t soutl;
 823     int blocksize;
 824
 825     /* Prevent accidental use of encryption context when decrypting */
 826     if (ctx->encrypt) {
 827         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
 828         return 0;
 829     }
 830
 831     if (ctx->cipher == NULL) {
 832         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 833         return 0;
 834     }
 835     if (ctx->cipher->prov == NULL)
 836         goto legacy;
 837
 838     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 839
 840     if (ctx->cipher->cupdate == NULL || blocksize < 1) {
 841         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 842         return 0;
 843     }
 844     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 845                                inl + (blocksize == 1 ? 0 : blocksize), in,
 846                                (size_t)inl);
 847
 848     if (ret) {
 849         if (soutl > INT_MAX) {
 850             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 851             return 0;
 852         }
 853         *outl = soutl;
 854     }
 855
 856     return ret;
 857
 858     /* TODO(3.0): Remove legacy code below */
 859  legacy:
 860
 861     b = ctx->cipher->block_size;
 862
 863     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 864         cmpl = (cmpl + 7) / 8;
 865
 866     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 867         if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
 868             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 869             return 0;
 870         }
 871
 872         fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
 873         if (fix_len < 0) {
 874             *outl = 0;
 875             return 0;
 876         } else
 877             *outl = fix_len;
 878         return 1;
 879     }
 880
 881     if (inl <= 0) {
 882         *outl = 0;
 883         return inl == 0;
 884     }
 885
 886     if (ctx->flags & EVP_CIPH_NO_PADDING)
 887         return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 888
 889     OPENSSL_assert(b <= sizeof(ctx->final));
 890
 891     if (ctx->final_used) {
 892         /* see comment about PTRDIFF_T comparison above */
 893         if (((PTRDIFF_T)out == (PTRDIFF_T)in)
 894             || is_partially_overlapping(out, in, b)) {
 895             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 896             return 0;
 897         }
 898         memcpy(out, ctx->final, b);
 899         out += b;
 900         fix_len = 1;
 901     } else
 902         fix_len = 0;
 903
 904     if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
 905         return 0;
 906
 907     /*
 908      * if we have 'decrypted' a multiple of block size, make sure we have a
 909      * copy of this last block
 910      */
 911     if (b > 1 && !ctx->buf_len) {
 912         *outl -= b;
 913         ctx->final_used = 1;
 914         memcpy(ctx->final, &out[*outl], b);
 915     } else
 916         ctx->final_used = 0;
 917
 918     if (fix_len)
 919         *outl += b;
 920
 921     return 1;
 922 }
 923
 924 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 925 {
 926     int ret;
 927     ret = EVP_DecryptFinal_ex(ctx, out, outl);
 928     return ret;
 929 }
 930
 931 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 932 {
 933     int i, n;
 934     unsigned int b;
 935     size_t soutl;
 936     int ret;
 937     int blocksize;
 938
 939     /* Prevent accidental use of encryption context when decrypting */
 940     if (ctx->encrypt) {
 941         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 942         return 0;
 943     }
 944
 945     if (ctx->cipher == NULL) {
 946         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 947         return 0;
 948     }
 949
 950     if (ctx->cipher->prov == NULL)
 951         goto legacy;
 952
 953     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 954
 955     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 956         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 957         return 0;
 958     }
 959
 960     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 961                               blocksize == 1 ? 0 : blocksize);
 962
 963     if (ret) {
 964         if (soutl > INT_MAX) {
 965             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 966             return 0;
 967         }
 968         *outl = soutl;
 969     }
 970
 971     return ret;
 972
 973     /* TODO(3.0): Remove legacy code below */
 974  legacy:
 975
 976     *outl = 0;
 977     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 978         i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 979         if (i < 0)
 980             return 0;
 981         else
 982             *outl = i;
 983         return 1;
 984     }
 985
 986     b = ctx->cipher->block_size;
 987     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 988         if (ctx->buf_len) {
 989             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
 990                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 991             return 0;
 992         }
 993         *outl = 0;
 994         return 1;
 995     }
 996     if (b > 1) {
 997         if (ctx->buf_len || !ctx->final_used) {
 998             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 999             return 0;
1000         }
1001         OPENSSL_assert(b <= sizeof(ctx->final));
1002
1003         /*
1004          * The following assumes that the ciphertext has been authenticated.
1005          * Otherwise it provides a padding oracle.
1006          */
1007         n = ctx->final[b - 1];
1008         if (n == 0 || n > (int)b) {
1009             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
1010             return 0;
1011         }
1012         for (i = 0; i < n; i++) {
1013             if (ctx->final[--b] != n) {
1014                 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
1015                 return 0;
1016             }
1017         }
1018         n = ctx->cipher->block_size - n;
1019         for (i = 0; i < n; i++)
1020             out[i] = ctx->final[i];
1021         *outl = n;
1022     } else
1023         *outl = 0;
1024     return 1;
1025 }
1026
1027 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
1028 {
1029     int ok;
1030     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1031     size_t len = keylen;
1032
1033     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
1034     ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
1035
1036     if (ok != EVP_CTRL_RET_UNSUPPORTED)
1037         return ok;
1038
1039     /* TODO(3.0) legacy code follows */
1040     if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
1041         return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
1042     if (EVP_CIPHER_CTX_key_length(c) == keylen)
1043         return 1;
1044     if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
1045         c->key_len = keylen;
1046         return 1;
1047     }
1048     EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
1049     return 0;
1050 }
1051
1052 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
1053 {
1054     int ok;
1055     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1056     unsigned int pd = pad;
1057
1058     if (pad)
1059         ctx->flags &= ~EVP_CIPH_NO_PADDING;
1060     else
1061         ctx->flags |= EVP_CIPH_NO_PADDING;
1062
1063     params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
1064     ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1065
1066     return ok != 0;
1067 }
1068
1069 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
1070 {
1071     int ret = EVP_CTRL_RET_UNSUPPORTED;
1072     int set_params = 1;
1073     size_t sz = arg;
1074     unsigned int i;
1075     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1076
1077     if (ctx == NULL || ctx->cipher == NULL) {
1078         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
1079         return 0;
1080     }
1081
1082     if (ctx->cipher->prov == NULL)
1083         goto legacy;
1084
1085     switch (type) {
1086     case EVP_CTRL_SET_KEY_LENGTH:
1087         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
1088         break;
1089     case EVP_CTRL_RAND_KEY:      /* Used by DES */
1090         set_params = 0;
1091         params[0] =
1092             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
1093                                               ptr, sz);
1094         break;
1095
1096     case EVP_CTRL_INIT:
1097         /*
1098          * TODO(3.0) EVP_CTRL_INIT is purely legacy, no provider counterpart
1099          * As a matter of fact, this should be dead code, but some caller
1100          * might still do a direct control call with this command, so...
1101          * Legacy methods return 1 except for exceptional circumstances, so
1102          * we do the same here to not be disruptive.
1103          */
1104         return 1;
1105     case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
1106     default:
1107         goto end;
1108     case EVP_CTRL_GET_IV:
1109         set_params = 0;
1110         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
1111                                                       ptr, sz);
1112         break;
1113     case EVP_CTRL_AEAD_SET_IVLEN:
1114         if (arg < 0)
1115             return 0;
1116         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
1117         break;
1118     case EVP_CTRL_GCM_SET_IV_FIXED:
1119         params[0] =
1120             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED,
1121                                               ptr, sz);
1122         break;
1123     case EVP_CTRL_GET_RC5_ROUNDS:
1124         set_params = 0; /* Fall thru */
1125     case EVP_CTRL_SET_RC5_ROUNDS:
1126         if (arg < 0)
1127             return 0;
1128         i = (unsigned int)arg;
1129         params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_ROUNDS, &i);
1130         break;
1131     case EVP_CTRL_SET_SPEED:
1132         if (arg < 0)
1133             return 0;
1134         i = (unsigned int)arg;
1135         params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_SPEED, &i);
1136         break;
1137     case EVP_CTRL_AEAD_GET_TAG:
1138         set_params = 0; /* Fall thru */
1139     case EVP_CTRL_AEAD_SET_TAG:
1140         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1141                                                       ptr, sz);
1142         break;
1143     case EVP_CTRL_AEAD_SET_MAC_KEY:
1144         params[0] =
1145             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_MAC_KEY,
1146                                               ptr, sz);
1147         break;
1148     case EVP_CTRL_AEAD_TLS1_AAD:
1149         /* This one does a set and a get - since it returns a padding size */
1150         params[0] =
1151             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1152                                               ptr, sz);
1153         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1154         if (ret <= 0)
1155             goto end;
1156         params[0] =
1157             OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1158         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1159         if (ret <= 0)
1160             goto end;
1161         return sz;
1162 #ifndef OPENSSL_NO_RC2
1163     case EVP_CTRL_GET_RC2_KEY_BITS:
1164         set_params = 0; /* Fall thru */
1165     case EVP_CTRL_SET_RC2_KEY_BITS:
1166         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, &sz);
1167         break;
1168 #endif /* OPENSSL_NO_RC2 */
1169     }
1170
1171     if (set_params)
1172         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1173     else
1174         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1175     goto end;
1176
1177 /* TODO(3.0): Remove legacy code below */
1178 legacy:
1179     if (ctx->cipher->ctrl == NULL) {
1180         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1181         return 0;
1182     }
1183
1184     ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1185
1186  end:
1187     if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1188         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1189                EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1190         return 0;
1191     }
1192     return ret;
1193 }
1194
1195 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1196 {
1197     if (cipher != NULL && cipher->get_params != NULL)
1198         return cipher->get_params(params);
1199     return 0;
1200 }
1201
1202 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1203 {
1204     if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1205         return ctx->cipher->set_ctx_params(ctx->provctx, params);
1206     return 0;
1207 }
1208
1209 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1210 {
1211     if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1212         return ctx->cipher->get_ctx_params(ctx->provctx, params);
1213     return 0;
1214 }
1215
1216 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1217 {
1218     if (cipher != NULL && cipher->gettable_params != NULL)
1219         return cipher->gettable_params();
1220     return NULL;
1221 }
1222
1223 const OSSL_PARAM *EVP_CIPHER_settable_ctx_params(const EVP_CIPHER *cipher)
1224 {
1225     if (cipher != NULL && cipher->settable_ctx_params != NULL)
1226         return cipher->settable_ctx_params();
1227     return NULL;
1228 }
1229
1230 const OSSL_PARAM *EVP_CIPHER_gettable_ctx_params(const EVP_CIPHER *cipher)
1231 {
1232     if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1233         return cipher->gettable_ctx_params();
1234     return NULL;
1235 }
1236
1237 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1238 {
1239     if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1240         return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1241
1242 #ifdef FIPS_MODE
1243     return 0;
1244 #else
1245     {
1246         int kl;
1247
1248         kl = EVP_CIPHER_CTX_key_length(ctx);
1249         if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1250             return 0;
1251         return 1;
1252     }
1253 #endif /* FIPS_MODE */
1254 }
1255
1256 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1257 {
1258     if ((in == NULL) || (in->cipher == NULL)) {
1259         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1260         return 0;
1261     }
1262
1263     if (in->cipher->prov == NULL)
1264         goto legacy;
1265
1266     if (in->cipher->dupctx == NULL) {
1267         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1268         return 0;
1269     }
1270
1271     EVP_CIPHER_CTX_reset(out);
1272
1273     *out = *in;
1274     out->provctx = NULL;
1275
1276     if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1277         out->fetched_cipher = NULL;
1278         return 0;
1279     }
1280
1281     out->provctx = in->cipher->dupctx(in->provctx);
1282     if (out->provctx == NULL) {
1283         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1284         return 0;
1285     }
1286
1287     return 1;
1288
1289     /* TODO(3.0): Remove legacy code below */
1290  legacy:
1291
1292 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
1293     /* Make sure it's safe to copy a cipher context using an ENGINE */
1294     if (in->engine && !ENGINE_init(in->engine)) {
1295         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1296         return 0;
1297     }
1298 #endif
1299
1300     EVP_CIPHER_CTX_reset(out);
1301     memcpy(out, in, sizeof(*out));
1302
1303     if (in->cipher_data && in->cipher->ctx_size) {
1304         out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1305         if (out->cipher_data == NULL) {
1306             out->cipher = NULL;
1307             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1308             return 0;
1309         }
1310         memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1311     }
1312
1313     if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1314         if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1315             out->cipher = NULL;
1316             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1317             return 0;
1318         }
1319     return 1;
1320 }
1321
1322 EVP_CIPHER *evp_cipher_new(void)
1323 {
1324     EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1325
1326     if (cipher != NULL) {
1327         cipher->lock = CRYPTO_THREAD_lock_new();
1328         if (cipher->lock == NULL) {
1329             OPENSSL_free(cipher);
1330             return NULL;
1331         }
1332         cipher->refcnt = 1;
1333     }
1334     return cipher;
1335 }
1336
1337 /*
1338  * FIPS module note: since internal fetches will be entirely
1339  * provider based, we know that none of its code depends on legacy
1340  * NIDs or any functionality that use them.
1341  */
1342 #ifndef FIPS_MODE
1343 /* TODO(3.x) get rid of the need for legacy NIDs */
1344 static void set_legacy_nid(const char *name, void *vlegacy_nid)
1345 {
1346     int nid;
1347     int *legacy_nid = vlegacy_nid;
1348
1349     if (*legacy_nid == -1)       /* We found a clash already */
1350         return;
1351     if ((nid = OBJ_sn2nid(name)) == NID_undef
1352         && (nid = OBJ_ln2nid(name)) == NID_undef)
1353         return;
1354     if (*legacy_nid != NID_undef && *legacy_nid != nid) {
1355         *legacy_nid = -1;
1356         return;
1357     }
1358     *legacy_nid = nid;
1359 }
1360 #endif
1361
1362 static void *evp_cipher_from_dispatch(const int name_id,
1363                                       const OSSL_DISPATCH *fns,
1364                                       OSSL_PROVIDER *prov)
1365 {
1366     EVP_CIPHER *cipher = NULL;
1367     int fnciphcnt = 0, fnctxcnt = 0;
1368
1369     if ((cipher = evp_cipher_new()) == NULL) {
1370         EVPerr(0, ERR_R_MALLOC_FAILURE);
1371         return NULL;
1372     }
1373
1374 #ifndef FIPS_MODE
1375     /* TODO(3.x) get rid of the need for legacy NIDs */
1376     cipher->nid = NID_undef;
1377     evp_names_do_all(prov, name_id, set_legacy_nid, &cipher->nid);
1378     if (cipher->nid == -1) {
1379         ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
1380         EVP_CIPHER_free(cipher);
1381         return NULL;
1382     }
1383 #endif
1384
1385     cipher->name_id = name_id;
1386
1387     for (; fns->function_id != 0; fns++) {
1388         switch (fns->function_id) {
1389         case OSSL_FUNC_CIPHER_NEWCTX:
1390             if (cipher->newctx != NULL)
1391                 break;
1392             cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
1393             fnctxcnt++;
1394             break;
1395         case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1396             if (cipher->einit != NULL)
1397                 break;
1398             cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
1399             fnciphcnt++;
1400             break;
1401         case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1402             if (cipher->dinit != NULL)
1403                 break;
1404             cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
1405             fnciphcnt++;
1406             break;
1407         case OSSL_FUNC_CIPHER_UPDATE:
1408             if (cipher->cupdate != NULL)
1409                 break;
1410             cipher->cupdate = OSSL_get_OP_cipher_update(fns);
1411             fnciphcnt++;
1412             break;
1413         case OSSL_FUNC_CIPHER_FINAL:
1414             if (cipher->cfinal != NULL)
1415                 break;
1416             cipher->cfinal = OSSL_get_OP_cipher_final(fns);
1417             fnciphcnt++;
1418             break;
1419         case OSSL_FUNC_CIPHER_CIPHER:
1420             if (cipher->ccipher != NULL)
1421                 break;
1422             cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
1423             break;
1424         case OSSL_FUNC_CIPHER_FREECTX:
1425             if (cipher->freectx != NULL)
1426                 break;
1427             cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
1428             fnctxcnt++;
1429             break;
1430         case OSSL_FUNC_CIPHER_DUPCTX:
1431             if (cipher->dupctx != NULL)
1432                 break;
1433             cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
1434             break;
1435         case OSSL_FUNC_CIPHER_GET_PARAMS:
1436             if (cipher->get_params != NULL)
1437                 break;
1438             cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
1439             break;
1440         case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1441             if (cipher->get_ctx_params != NULL)
1442                 break;
1443             cipher->get_ctx_params = OSSL_get_OP_cipher_get_ctx_params(fns);
1444             break;
1445         case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1446             if (cipher->set_ctx_params != NULL)
1447                 break;
1448             cipher->set_ctx_params = OSSL_get_OP_cipher_set_ctx_params(fns);
1449             break;
1450         case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1451             if (cipher->gettable_params != NULL)
1452                 break;
1453             cipher->gettable_params = OSSL_get_OP_cipher_gettable_params(fns);
1454             break;
1455         case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1456             if (cipher->gettable_ctx_params != NULL)
1457                 break;
1458             cipher->gettable_ctx_params =
1459                 OSSL_get_OP_cipher_gettable_ctx_params(fns);
1460             break;
1461         case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1462             if (cipher->settable_ctx_params != NULL)
1463                 break;
1464             cipher->settable_ctx_params =
1465                 OSSL_get_OP_cipher_settable_ctx_params(fns);
1466             break;
1467         }
1468     }
1469     if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1470             || (fnciphcnt == 0 && cipher->ccipher == NULL)
1471             || fnctxcnt != 2) {
1472         /*
1473          * In order to be a consistent set of functions we must have at least
1474          * a complete set of "encrypt" functions, or a complete set of "decrypt"
1475          * functions, or a single "cipher" function. In all cases we need both
1476          * the "newctx" and "freectx" functions.
1477          */
1478         EVP_CIPHER_free(cipher);
1479         EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1480         return NULL;
1481     }
1482     cipher->prov = prov;
1483     if (prov != NULL)
1484         ossl_provider_up_ref(prov);
1485
1486     return cipher;
1487 }
1488
1489 static int evp_cipher_up_ref(void *cipher)
1490 {
1491     return EVP_CIPHER_up_ref(cipher);
1492 }
1493
1494 static void evp_cipher_free(void *cipher)
1495 {
1496     EVP_CIPHER_free(cipher);
1497 }
1498
1499 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1500                              const char *properties)
1501 {
1502     EVP_CIPHER *cipher =
1503         evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1504                           evp_cipher_from_dispatch, evp_cipher_up_ref,
1505                           evp_cipher_free);
1506
1507     return cipher;
1508 }
1509
1510 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1511 {
1512     int ref = 0;
1513
1514     CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1515     return 1;
1516 }
1517
1518 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1519 {
1520     int i;
1521
1522     if (cipher == NULL)
1523         return;
1524
1525     CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1526     if (i > 0)
1527         return;
1528     ossl_provider_free(cipher->prov);
1529     CRYPTO_THREAD_lock_free(cipher->lock);
1530     OPENSSL_free(cipher);
1531 }
1532
1533 void EVP_CIPHER_do_all_provided(OPENSSL_CTX *libctx,
1534                                 void (*fn)(EVP_CIPHER *mac, void *arg),
1535                                 void *arg)
1536 {
1537     evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1538                        (void (*)(void *, void *))fn, arg,
1539                        evp_cipher_from_dispatch, evp_cipher_free);
1540 }