crypto/evp/evp_enc.c

   1 /*
   2  * Copyright 1995-2020 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_MODULE)
  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_MODULE)
  85     ENGINE *tmpimpl = NULL;
  86 #endif
  87     /*
  88      * enc == 1 means we are encrypting.
  89      * enc == 0 means we are decrypting.
  90      * enc == -1 means, use the previously initialised value for encrypt/decrypt
  91      */
  92     if (enc == -1) {
  93         enc = ctx->encrypt;
  94     } else {
  95         if (enc)
  96             enc = 1;
  97         ctx->encrypt = enc;
  98     }
  99
 100     if (cipher == NULL && ctx->cipher == NULL) {
 101         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
 102         return 0;
 103     }
 104
 105     /* TODO(3.0): Legacy work around code below. Remove this */
 106
 107 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
 108     /*
 109      * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
 110      * this context may already have an ENGINE! Try to avoid releasing the
 111      * previous handle, re-querying for an ENGINE, and having a
 112      * reinitialisation, when it may all be unnecessary.
 113      */
 114     if (ctx->engine && ctx->cipher
 115         && (cipher == NULL || cipher->nid == ctx->cipher->nid))
 116         goto skip_to_init;
 117
 118     if (cipher != NULL && impl == NULL) {
 119          /* Ask if an ENGINE is reserved for this job */
 120         tmpimpl = ENGINE_get_cipher_engine(cipher->nid);
 121     }
 122 #endif
 123
 124     /*
 125      * If there are engines involved then we should use legacy handling for now.
 126      */
 127     if (ctx->engine != NULL
 128 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
 129             || tmpimpl != NULL
 130 #endif
 131             || impl != NULL) {
 132         if (ctx->cipher == ctx->fetched_cipher)
 133             ctx->cipher = NULL;
 134         EVP_CIPHER_free(ctx->fetched_cipher);
 135         ctx->fetched_cipher = NULL;
 136         goto legacy;
 137     }
 138     /*
 139      * Ensure a context left lying around from last time is cleared
 140      * (legacy code)
 141      */
 142     if (cipher != NULL && ctx->cipher != NULL) {
 143         OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
 144         ctx->cipher_data = NULL;
 145     }
 146
 147
 148     /* TODO(3.0): Start of non-legacy code below */
 149
 150     /* Ensure a context left lying around from last time is cleared */
 151     if (cipher != NULL && ctx->cipher != NULL) {
 152         unsigned long flags = ctx->flags;
 153
 154         EVP_CIPHER_CTX_reset(ctx);
 155         /* Restore encrypt and flags */
 156         ctx->encrypt = enc;
 157         ctx->flags = flags;
 158     }
 159
 160     if (cipher == NULL)
 161         cipher = ctx->cipher;
 162
 163     if (cipher->prov == NULL) {
 164 #ifdef FIPS_MODULE
 165         /* We only do explicit fetches inside the FIPS module */
 166         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 167         return 0;
 168 #else
 169         EVP_CIPHER *provciph =
 170             EVP_CIPHER_fetch(NULL,
 171                              cipher->nid == NID_undef ? "NULL"
 172                                                       : OBJ_nid2sn(cipher->nid),
 173                              "");
 174
 175         if (provciph == NULL) {
 176             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 177             return 0;
 178         }
 179         cipher = provciph;
 180         EVP_CIPHER_free(ctx->fetched_cipher);
 181         ctx->fetched_cipher = provciph;
 182 #endif
 183     }
 184
 185     ctx->cipher = cipher;
 186     if (ctx->provctx == NULL) {
 187         ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
 188         if (ctx->provctx == NULL) {
 189             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 190             return 0;
 191         }
 192     }
 193
 194     if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
 195         /*
 196          * If this ctx was already set up for no padding then we need to tell
 197          * the new cipher about it.
 198          */
 199         if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
 200             return 0;
 201     }
 202
 203     if (enc) {
 204         if (ctx->cipher->einit == NULL) {
 205             EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 206             return 0;
 207         }
 208
 209         return ctx->cipher->einit(ctx->provctx,
 210                                   key,
 211                                   key == NULL ? 0
 212                                               : EVP_CIPHER_CTX_key_length(ctx),
 213                                   iv,
 214                                   iv == NULL ? 0
 215                                              : EVP_CIPHER_CTX_iv_length(ctx));
 216     }
 217
 218     if (ctx->cipher->dinit == NULL) {
 219         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 220         return 0;
 221     }
 222
 223     return ctx->cipher->dinit(ctx->provctx,
 224                               key,
 225                               key == NULL ? 0
 226                                           : EVP_CIPHER_CTX_key_length(ctx),
 227                               iv,
 228                               iv == NULL ? 0
 229                                          : EVP_CIPHER_CTX_iv_length(ctx));
 230
 231     /* TODO(3.0): Remove legacy code below */
 232  legacy:
 233
 234     if (cipher != NULL) {
 235         /*
 236          * Ensure a context left lying around from last time is cleared (we
 237          * previously attempted to avoid this if the same ENGINE and
 238          * EVP_CIPHER could be used).
 239          */
 240         if (ctx->cipher) {
 241             unsigned long flags = ctx->flags;
 242             EVP_CIPHER_CTX_reset(ctx);
 243             /* Restore encrypt and flags */
 244             ctx->encrypt = enc;
 245             ctx->flags = flags;
 246         }
 247 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
 248         if (impl != NULL) {
 249             if (!ENGINE_init(impl)) {
 250                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 251                 return 0;
 252             }
 253         } else {
 254             impl = tmpimpl;
 255         }
 256         if (impl != NULL) {
 257             /* There's an ENGINE for this job ... (apparently) */
 258             const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
 259
 260             if (c == NULL) {
 261                 /*
 262                  * One positive side-effect of US's export control history,
 263                  * is that we should at least be able to avoid using US
 264                  * misspellings of "initialisation"?
 265                  */
 266                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 267                 return 0;
 268             }
 269             /* We'll use the ENGINE's private cipher definition */
 270             cipher = c;
 271             /*
 272              * Store the ENGINE functional reference so we know 'cipher' came
 273              * from an ENGINE and we need to release it when done.
 274              */
 275             ctx->engine = impl;
 276         } else {
 277             ctx->engine = NULL;
 278         }
 279 #endif
 280
 281         ctx->cipher = cipher;
 282         if (ctx->cipher->ctx_size) {
 283             ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
 284             if (ctx->cipher_data == NULL) {
 285                 ctx->cipher = NULL;
 286                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
 287                 return 0;
 288             }
 289         } else {
 290             ctx->cipher_data = NULL;
 291         }
 292         ctx->key_len = cipher->key_len;
 293         /* Preserve wrap enable flag, zero everything else */
 294         ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
 295         if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
 296             if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
 297                 ctx->cipher = NULL;
 298                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 299                 return 0;
 300             }
 301         }
 302     }
 303 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
 304  skip_to_init:
 305 #endif
 306     if (ctx->cipher == NULL)
 307         return 0;
 308
 309     /* we assume block size is a power of 2 in *cryptUpdate */
 310     OPENSSL_assert(ctx->cipher->block_size == 1
 311                    || ctx->cipher->block_size == 8
 312                    || ctx->cipher->block_size == 16);
 313
 314     if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
 315         && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
 316         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
 317         return 0;
 318     }
 319
 320     if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
 321         switch (EVP_CIPHER_CTX_mode(ctx)) {
 322
 323         case EVP_CIPH_STREAM_CIPHER:
 324         case EVP_CIPH_ECB_MODE:
 325             break;
 326
 327         case EVP_CIPH_CFB_MODE:
 328         case EVP_CIPH_OFB_MODE:
 329
 330             ctx->num = 0;
 331             /* fall-through */
 332
 333         case EVP_CIPH_CBC_MODE:
 334
 335             OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
 336                            (int)sizeof(ctx->iv));
 337             if (iv)
 338                 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 339             memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
 340             break;
 341
 342         case EVP_CIPH_CTR_MODE:
 343             ctx->num = 0;
 344             /* Don't reuse IV for CTR mode */
 345             if (iv)
 346                 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 347             break;
 348
 349         default:
 350             return 0;
 351         }
 352     }
 353
 354     if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 355         if (!ctx->cipher->init(ctx, key, iv, enc))
 356             return 0;
 357     }
 358     ctx->buf_len = 0;
 359     ctx->final_used = 0;
 360     ctx->block_mask = ctx->cipher->block_size - 1;
 361     return 1;
 362 }
 363
 364 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 365                      const unsigned char *in, int inl)
 366 {
 367     if (ctx->encrypt)
 368         return EVP_EncryptUpdate(ctx, out, outl, in, inl);
 369     else
 370         return EVP_DecryptUpdate(ctx, out, outl, in, inl);
 371 }
 372
 373 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 374 {
 375     if (ctx->encrypt)
 376         return EVP_EncryptFinal_ex(ctx, out, outl);
 377     else
 378         return EVP_DecryptFinal_ex(ctx, out, outl);
 379 }
 380
 381 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 382 {
 383     if (ctx->encrypt)
 384         return EVP_EncryptFinal(ctx, out, outl);
 385     else
 386         return EVP_DecryptFinal(ctx, out, outl);
 387 }
 388
 389 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 390                     const unsigned char *key, const unsigned char *iv)
 391 {
 392     return EVP_CipherInit(ctx, cipher, key, iv, 1);
 393 }
 394
 395 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 396                        ENGINE *impl, const unsigned char *key,
 397                        const unsigned char *iv)
 398 {
 399     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 400 }
 401
 402 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 403                     const unsigned char *key, const unsigned char *iv)
 404 {
 405     return EVP_CipherInit(ctx, cipher, key, iv, 0);
 406 }
 407
 408 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 409                        ENGINE *impl, const unsigned char *key,
 410                        const unsigned char *iv)
 411 {
 412     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 413 }
 414
 415 /*
 416  * According to the letter of standard difference between pointers
 417  * is specified to be valid only within same object. This makes
 418  * it formally challenging to determine if input and output buffers
 419  * are not partially overlapping with standard pointer arithmetic.
 420  */
 421 #ifdef PTRDIFF_T
 422 # undef PTRDIFF_T
 423 #endif
 424 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
 425 /*
 426  * Then we have VMS that distinguishes itself by adhering to
 427  * sizeof(size_t)==4 even in 64-bit builds, which means that
 428  * difference between two pointers might be truncated to 32 bits.
 429  * In the context one can even wonder how comparison for
 430  * equality is implemented. To be on the safe side we adhere to
 431  * PTRDIFF_T even for comparison for equality.
 432  */
 433 # define PTRDIFF_T uint64_t
 434 #else
 435 # define PTRDIFF_T size_t
 436 #endif
 437
 438 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
 439 {
 440     PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
 441     /*
 442      * Check for partially overlapping buffers. [Binary logical
 443      * operations are used instead of boolean to minimize number
 444      * of conditional branches.]
 445      */
 446     int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
 447                                                 (diff > (0 - (PTRDIFF_T)len)));
 448
 449     return overlapped;
 450 }
 451
 452 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
 453                                     unsigned char *out, int *outl,
 454                                     const unsigned char *in, int inl)
 455 {
 456     int i, j, bl, cmpl = inl;
 457
 458     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 459         cmpl = (cmpl + 7) / 8;
 460
 461     bl = ctx->cipher->block_size;
 462
 463     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 464         /* If block size > 1 then the cipher will have to do this check */
 465         if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
 466             EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 467             return 0;
 468         }
 469
 470         i = ctx->cipher->do_cipher(ctx, out, in, inl);
 471         if (i < 0)
 472             return 0;
 473         else
 474             *outl = i;
 475         return 1;
 476     }
 477
 478     if (inl <= 0) {
 479         *outl = 0;
 480         return inl == 0;
 481     }
 482     if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
 483         EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 484         return 0;
 485     }
 486
 487     if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
 488         if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
 489             *outl = inl;
 490             return 1;
 491         } else {
 492             *outl = 0;
 493             return 0;
 494         }
 495     }
 496     i = ctx->buf_len;
 497     OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
 498     if (i != 0) {
 499         if (bl - i > inl) {
 500             memcpy(&(ctx->buf[i]), in, inl);
 501             ctx->buf_len += inl;
 502             *outl = 0;
 503             return 1;
 504         } else {
 505             j = bl - i;
 506             memcpy(&(ctx->buf[i]), in, j);
 507             inl -= j;
 508             in += j;
 509             if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
 510                 return 0;
 511             out += bl;
 512             *outl = bl;
 513         }
 514     } else
 515         *outl = 0;
 516     i = inl & (bl - 1);
 517     inl -= i;
 518     if (inl > 0) {
 519         if (!ctx->cipher->do_cipher(ctx, out, in, inl))
 520             return 0;
 521         *outl += inl;
 522     }
 523
 524     if (i != 0)
 525         memcpy(ctx->buf, &(in[inl]), i);
 526     ctx->buf_len = i;
 527     return 1;
 528 }
 529
 530
 531 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 532                       const unsigned char *in, int inl)
 533 {
 534     int ret;
 535     size_t soutl;
 536     int blocksize;
 537
 538     /* Prevent accidental use of decryption context when encrypting */
 539     if (!ctx->encrypt) {
 540         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
 541         return 0;
 542     }
 543
 544     if (ctx->cipher == NULL) {
 545         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 546         return 0;
 547     }
 548
 549     if (ctx->cipher->prov == NULL)
 550         goto legacy;
 551
 552     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 553
 554     if (ctx->cipher->cupdate == NULL  || blocksize < 1) {
 555         EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 556         return 0;
 557     }
 558     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 559                                inl + (blocksize == 1 ? 0 : blocksize), in,
 560                                (size_t)inl);
 561
 562     if (ret) {
 563         if (soutl > INT_MAX) {
 564             EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
 565             return 0;
 566         }
 567         *outl = soutl;
 568     }
 569
 570     return ret;
 571
 572     /* TODO(3.0): Remove legacy code below */
 573  legacy:
 574
 575     return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 576 }
 577
 578 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 579 {
 580     int ret;
 581     ret = EVP_EncryptFinal_ex(ctx, out, outl);
 582     return ret;
 583 }
 584
 585 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 586 {
 587     int n, ret;
 588     unsigned int i, b, bl;
 589     size_t soutl;
 590     int blocksize;
 591
 592     /* Prevent accidental use of decryption context when encrypting */
 593     if (!ctx->encrypt) {
 594         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 595         return 0;
 596     }
 597
 598     if (ctx->cipher == NULL) {
 599         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 600         return 0;
 601     }
 602     if (ctx->cipher->prov == NULL)
 603         goto legacy;
 604
 605     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 606
 607     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 608         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 609         return 0;
 610     }
 611
 612     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 613                               blocksize == 1 ? 0 : blocksize);
 614
 615     if (ret) {
 616         if (soutl > INT_MAX) {
 617             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 618             return 0;
 619         }
 620         *outl = soutl;
 621     }
 622
 623     return ret;
 624
 625     /* TODO(3.0): Remove legacy code below */
 626  legacy:
 627
 628     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 629         ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 630         if (ret < 0)
 631             return 0;
 632         else
 633             *outl = ret;
 634         return 1;
 635     }
 636
 637     b = ctx->cipher->block_size;
 638     OPENSSL_assert(b <= sizeof(ctx->buf));
 639     if (b == 1) {
 640         *outl = 0;
 641         return 1;
 642     }
 643     bl = ctx->buf_len;
 644     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 645         if (bl) {
 646             EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
 647                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 648             return 0;
 649         }
 650         *outl = 0;
 651         return 1;
 652     }
 653
 654     n = b - bl;
 655     for (i = bl; i < b; i++)
 656         ctx->buf[i] = n;
 657     ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
 658
 659     if (ret)
 660         *outl = b;
 661
 662     return ret;
 663 }
 664
 665 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 666                       const unsigned char *in, int inl)
 667 {
 668     int fix_len, cmpl = inl, ret;
 669     unsigned int b;
 670     size_t soutl;
 671     int blocksize;
 672
 673     /* Prevent accidental use of encryption context when decrypting */
 674     if (ctx->encrypt) {
 675         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
 676         return 0;
 677     }
 678
 679     if (ctx->cipher == NULL) {
 680         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
 681         return 0;
 682     }
 683     if (ctx->cipher->prov == NULL)
 684         goto legacy;
 685
 686     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 687
 688     if (ctx->cipher->cupdate == NULL || blocksize < 1) {
 689         EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 690         return 0;
 691     }
 692     ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
 693                                inl + (blocksize == 1 ? 0 : blocksize), in,
 694                                (size_t)inl);
 695
 696     if (ret) {
 697         if (soutl > INT_MAX) {
 698             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
 699             return 0;
 700         }
 701         *outl = soutl;
 702     }
 703
 704     return ret;
 705
 706     /* TODO(3.0): Remove legacy code below */
 707  legacy:
 708
 709     b = ctx->cipher->block_size;
 710
 711     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 712         cmpl = (cmpl + 7) / 8;
 713
 714     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 715         if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
 716             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 717             return 0;
 718         }
 719
 720         fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
 721         if (fix_len < 0) {
 722             *outl = 0;
 723             return 0;
 724         } else
 725             *outl = fix_len;
 726         return 1;
 727     }
 728
 729     if (inl <= 0) {
 730         *outl = 0;
 731         return inl == 0;
 732     }
 733
 734     if (ctx->flags & EVP_CIPH_NO_PADDING)
 735         return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 736
 737     OPENSSL_assert(b <= sizeof(ctx->final));
 738
 739     if (ctx->final_used) {
 740         /* see comment about PTRDIFF_T comparison above */
 741         if (((PTRDIFF_T)out == (PTRDIFF_T)in)
 742             || is_partially_overlapping(out, in, b)) {
 743             EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
 744             return 0;
 745         }
 746         memcpy(out, ctx->final, b);
 747         out += b;
 748         fix_len = 1;
 749     } else
 750         fix_len = 0;
 751
 752     if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
 753         return 0;
 754
 755     /*
 756      * if we have 'decrypted' a multiple of block size, make sure we have a
 757      * copy of this last block
 758      */
 759     if (b > 1 && !ctx->buf_len) {
 760         *outl -= b;
 761         ctx->final_used = 1;
 762         memcpy(ctx->final, &out[*outl], b);
 763     } else
 764         ctx->final_used = 0;
 765
 766     if (fix_len)
 767         *outl += b;
 768
 769     return 1;
 770 }
 771
 772 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 773 {
 774     int ret;
 775     ret = EVP_DecryptFinal_ex(ctx, out, outl);
 776     return ret;
 777 }
 778
 779 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 780 {
 781     int i, n;
 782     unsigned int b;
 783     size_t soutl;
 784     int ret;
 785     int blocksize;
 786
 787     /* Prevent accidental use of encryption context when decrypting */
 788     if (ctx->encrypt) {
 789         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
 790         return 0;
 791     }
 792
 793     if (ctx->cipher == NULL) {
 794         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
 795         return 0;
 796     }
 797
 798     if (ctx->cipher->prov == NULL)
 799         goto legacy;
 800
 801     blocksize = EVP_CIPHER_CTX_block_size(ctx);
 802
 803     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 804         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 805         return 0;
 806     }
 807
 808     ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
 809                               blocksize == 1 ? 0 : blocksize);
 810
 811     if (ret) {
 812         if (soutl > INT_MAX) {
 813             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
 814             return 0;
 815         }
 816         *outl = soutl;
 817     }
 818
 819     return ret;
 820
 821     /* TODO(3.0): Remove legacy code below */
 822  legacy:
 823
 824     *outl = 0;
 825     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 826         i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 827         if (i < 0)
 828             return 0;
 829         else
 830             *outl = i;
 831         return 1;
 832     }
 833
 834     b = ctx->cipher->block_size;
 835     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 836         if (ctx->buf_len) {
 837             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
 838                    EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 839             return 0;
 840         }
 841         *outl = 0;
 842         return 1;
 843     }
 844     if (b > 1) {
 845         if (ctx->buf_len || !ctx->final_used) {
 846             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 847             return 0;
 848         }
 849         OPENSSL_assert(b <= sizeof(ctx->final));
 850
 851         /*
 852          * The following assumes that the ciphertext has been authenticated.
 853          * Otherwise it provides a padding oracle.
 854          */
 855         n = ctx->final[b - 1];
 856         if (n == 0 || n > (int)b) {
 857             EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
 858             return 0;
 859         }
 860         for (i = 0; i < n; i++) {
 861             if (ctx->final[--b] != n) {
 862                 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
 863                 return 0;
 864             }
 865         }
 866         n = ctx->cipher->block_size - n;
 867         for (i = 0; i < n; i++)
 868             out[i] = ctx->final[i];
 869         *outl = n;
 870     } else
 871         *outl = 0;
 872     return 1;
 873 }
 874
 875 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
 876 {
 877     if (c->cipher->prov != NULL) {
 878         int ok;
 879         OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 880         size_t len = keylen;
 881
 882         if (EVP_CIPHER_CTX_key_length(c) == keylen)
 883             return 1;
 884
 885         /* Check the cipher actually understands this parameter */
 886         if (OSSL_PARAM_locate_const(EVP_CIPHER_settable_ctx_params(c->cipher),
 887                                     OSSL_CIPHER_PARAM_KEYLEN) == NULL)
 888             return 0;
 889
 890         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
 891         ok = evp_do_ciph_ctx_setparams(c->cipher, c->provctx, params);
 892
 893         return ok > 0 ? 1 : 0;
 894     }
 895
 896     /* TODO(3.0) legacy code follows */
 897
 898     /*
 899      * Note there have never been any built-in ciphers that define this flag
 900      * since it was first introduced.
 901      */
 902     if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
 903         return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
 904     if (EVP_CIPHER_CTX_key_length(c) == keylen)
 905         return 1;
 906     if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
 907         c->key_len = keylen;
 908         return 1;
 909     }
 910     EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
 911     return 0;
 912 }
 913
 914 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
 915 {
 916     int ok;
 917     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 918     unsigned int pd = pad;
 919
 920     if (pad)
 921         ctx->flags &= ~EVP_CIPH_NO_PADDING;
 922     else
 923         ctx->flags |= EVP_CIPH_NO_PADDING;
 924
 925     params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
 926     ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
 927
 928     return ok != 0;
 929 }
 930
 931 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
 932 {
 933     int ret = EVP_CTRL_RET_UNSUPPORTED;
 934     int set_params = 1;
 935     size_t sz = arg;
 936     unsigned int i;
 937     OSSL_PARAM params[4] = {
 938         OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END
 939     };
 940
 941     if (ctx == NULL || ctx->cipher == NULL) {
 942         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
 943         return 0;
 944     }
 945
 946     if (ctx->cipher->prov == NULL)
 947         goto legacy;
 948
 949     switch (type) {
 950     case EVP_CTRL_SET_KEY_LENGTH:
 951         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
 952         break;
 953     case EVP_CTRL_RAND_KEY:      /* Used by DES */
 954         set_params = 0;
 955         params[0] =
 956             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
 957                                               ptr, sz);
 958         break;
 959
 960     case EVP_CTRL_INIT:
 961         /*
 962          * TODO(3.0) EVP_CTRL_INIT is purely legacy, no provider counterpart
 963          * As a matter of fact, this should be dead code, but some caller
 964          * might still do a direct control call with this command, so...
 965          * Legacy methods return 1 except for exceptional circumstances, so
 966          * we do the same here to not be disruptive.
 967          */
 968         return 1;
 969     case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
 970     default:
 971         goto end;
 972     case EVP_CTRL_GET_IV:
 973         set_params = 0;
 974         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
 975                                                       ptr, sz);
 976         break;
 977     case EVP_CTRL_AEAD_SET_IVLEN:
 978         if (arg < 0)
 979             return 0;
 980         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
 981         break;
 982     case EVP_CTRL_AEAD_SET_IV_FIXED:
 983         params[0] = OSSL_PARAM_construct_octet_string(
 984                         OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED, ptr, sz);
 985         break;
 986     case EVP_CTRL_GCM_IV_GEN:
 987         set_params = 0;
 988         if (arg < 0)
 989             sz = 0; /* special case that uses the iv length */
 990         params[0] = OSSL_PARAM_construct_octet_string(
 991                         OSSL_CIPHER_PARAM_AEAD_TLS1_GET_IV_GEN, ptr, sz);
 992         break;
 993     case EVP_CTRL_GCM_SET_IV_INV:
 994         if (arg < 0)
 995             return 0;
 996         params[0] = OSSL_PARAM_construct_octet_string(
 997                         OSSL_CIPHER_PARAM_AEAD_TLS1_SET_IV_INV, ptr, sz);
 998         break;
 999     case EVP_CTRL_GET_RC5_ROUNDS:
1000         set_params = 0; /* Fall thru */
1001     case EVP_CTRL_SET_RC5_ROUNDS:
1002         if (arg < 0)
1003             return 0;
1004         i = (unsigned int)arg;
1005         params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_ROUNDS, &i);
1006         break;
1007     case EVP_CTRL_SET_SPEED:
1008         if (arg < 0)
1009             return 0;
1010         i = (unsigned int)arg;
1011         params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_SPEED, &i);
1012         break;
1013     case EVP_CTRL_AEAD_GET_TAG:
1014         set_params = 0; /* Fall thru */
1015     case EVP_CTRL_AEAD_SET_TAG:
1016         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1017                                                       ptr, sz);
1018         break;
1019     case EVP_CTRL_AEAD_TLS1_AAD:
1020         /* This one does a set and a get - since it returns a size */
1021         params[0] =
1022             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1023                                               ptr, sz);
1024         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1025         if (ret <= 0)
1026             goto end;
1027         params[0] =
1028             OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1029         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1030         if (ret <= 0)
1031             goto end;
1032         return sz;
1033 #ifndef OPENSSL_NO_RC2
1034     case EVP_CTRL_GET_RC2_KEY_BITS:
1035         set_params = 0; /* Fall thru */
1036     case EVP_CTRL_SET_RC2_KEY_BITS:
1037         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, &sz);
1038         break;
1039 #endif /* OPENSSL_NO_RC2 */
1040 #if !defined(OPENSSL_NO_MULTIBLOCK)
1041     case EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE:
1042         params[0] = OSSL_PARAM_construct_size_t(
1043                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_SEND_FRAGMENT, &sz);
1044         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1045         if (ret <= 0)
1046             return 0;
1047
1048         params[0] = OSSL_PARAM_construct_size_t(
1049                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_BUFSIZE, &sz);
1050         params[1] = OSSL_PARAM_construct_end();
1051         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1052         if (ret <= 0)
1053             return 0;
1054         return sz;
1055     case EVP_CTRL_TLS1_1_MULTIBLOCK_AAD: {
1056         EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *p =
1057             (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *)ptr;
1058
1059         if (arg < (int)sizeof(EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM))
1060             return 0;
1061
1062         params[0] = OSSL_PARAM_construct_octet_string(
1063                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD, (void*)p->inp, p->len);
1064         params[1] = OSSL_PARAM_construct_uint(
1065                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1066         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1067         if (ret <= 0)
1068             return ret;
1069         /* Retrieve the return values changed by the set */
1070         params[0] = OSSL_PARAM_construct_size_t(
1071                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD_PACKLEN, &sz);
1072         params[1] = OSSL_PARAM_construct_uint(
1073                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1074         params[2] = OSSL_PARAM_construct_end();
1075         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1076         if (ret <= 0)
1077             return 0;
1078         return sz;
1079     }
1080     case EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT: {
1081         EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *p =
1082             (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *)ptr;
1083
1084         params[0] = OSSL_PARAM_construct_octet_string(
1085                         OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC, p->out, p->len);
1086
1087         params[1] = OSSL_PARAM_construct_octet_string(
1088                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_IN, (void*)p->inp,
1089                 p->len);
1090         params[2] = OSSL_PARAM_construct_uint(
1091                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1092         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1093         if (ret <= 0)
1094             return ret;
1095         params[0] = OSSL_PARAM_construct_size_t(
1096                         OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_LEN, &sz);
1097         params[1] = OSSL_PARAM_construct_end();
1098         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1099         if (ret <= 0)
1100             return 0;
1101         return sz;
1102     }
1103 #endif /* OPENSSL_NO_MULTIBLOCK */
1104     case EVP_CTRL_AEAD_SET_MAC_KEY:
1105         if (arg < 0)
1106             return -1;
1107         params[0] = OSSL_PARAM_construct_octet_string(
1108                 OSSL_CIPHER_PARAM_AEAD_MAC_KEY, ptr, sz);
1109         break;
1110     }
1111
1112     if (set_params)
1113         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1114     else
1115         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1116     goto end;
1117
1118 /* TODO(3.0): Remove legacy code below */
1119 legacy:
1120     if (ctx->cipher->ctrl == NULL) {
1121         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1122         return 0;
1123     }
1124
1125     ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1126
1127  end:
1128     if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1129         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1130                EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1131         return 0;
1132     }
1133     return ret;
1134 }
1135
1136 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1137 {
1138     if (cipher != NULL && cipher->get_params != NULL)
1139         return cipher->get_params(params);
1140     return 0;
1141 }
1142
1143 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1144 {
1145     if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1146         return ctx->cipher->set_ctx_params(ctx->provctx, params);
1147     return 0;
1148 }
1149
1150 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1151 {
1152     if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1153         return ctx->cipher->get_ctx_params(ctx->provctx, params);
1154     return 0;
1155 }
1156
1157 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1158 {
1159     if (cipher != NULL && cipher->gettable_params != NULL)
1160         return cipher->gettable_params();
1161     return NULL;
1162 }
1163
1164 const OSSL_PARAM *EVP_CIPHER_settable_ctx_params(const EVP_CIPHER *cipher)
1165 {
1166     if (cipher != NULL && cipher->settable_ctx_params != NULL)
1167         return cipher->settable_ctx_params();
1168     return NULL;
1169 }
1170
1171 const OSSL_PARAM *EVP_CIPHER_gettable_ctx_params(const EVP_CIPHER *cipher)
1172 {
1173     if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1174         return cipher->gettable_ctx_params();
1175     return NULL;
1176 }
1177
1178 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1179 {
1180     if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1181         return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1182
1183 #ifdef FIPS_MODULE
1184     return 0;
1185 #else
1186     {
1187         int kl;
1188
1189         kl = EVP_CIPHER_CTX_key_length(ctx);
1190         if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
1191             return 0;
1192         return 1;
1193     }
1194 #endif /* FIPS_MODULE */
1195 }
1196
1197 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1198 {
1199     if ((in == NULL) || (in->cipher == NULL)) {
1200         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1201         return 0;
1202     }
1203
1204     if (in->cipher->prov == NULL)
1205         goto legacy;
1206
1207     if (in->cipher->dupctx == NULL) {
1208         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1209         return 0;
1210     }
1211
1212     EVP_CIPHER_CTX_reset(out);
1213
1214     *out = *in;
1215     out->provctx = NULL;
1216
1217     if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1218         out->fetched_cipher = NULL;
1219         return 0;
1220     }
1221
1222     out->provctx = in->cipher->dupctx(in->provctx);
1223     if (out->provctx == NULL) {
1224         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1225         return 0;
1226     }
1227
1228     return 1;
1229
1230     /* TODO(3.0): Remove legacy code below */
1231  legacy:
1232
1233 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
1234     /* Make sure it's safe to copy a cipher context using an ENGINE */
1235     if (in->engine && !ENGINE_init(in->engine)) {
1236         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1237         return 0;
1238     }
1239 #endif
1240
1241     EVP_CIPHER_CTX_reset(out);
1242     memcpy(out, in, sizeof(*out));
1243
1244     if (in->cipher_data && in->cipher->ctx_size) {
1245         out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1246         if (out->cipher_data == NULL) {
1247             out->cipher = NULL;
1248             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1249             return 0;
1250         }
1251         memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1252     }
1253
1254     if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1255         if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1256             out->cipher = NULL;
1257             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1258             return 0;
1259         }
1260     return 1;
1261 }
1262
1263 EVP_CIPHER *evp_cipher_new(void)
1264 {
1265     EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1266
1267     if (cipher != NULL) {
1268         cipher->lock = CRYPTO_THREAD_lock_new();
1269         if (cipher->lock == NULL) {
1270             OPENSSL_free(cipher);
1271             return NULL;
1272         }
1273         cipher->refcnt = 1;
1274     }
1275     return cipher;
1276 }
1277
1278 /*
1279  * FIPS module note: since internal fetches will be entirely
1280  * provider based, we know that none of its code depends on legacy
1281  * NIDs or any functionality that use them.
1282  */
1283 #ifndef FIPS_MODULE
1284 /* TODO(3.x) get rid of the need for legacy NIDs */
1285 static void set_legacy_nid(const char *name, void *vlegacy_nid)
1286 {
1287     int nid;
1288     int *legacy_nid = vlegacy_nid;
1289     /*
1290      * We use lowest level function to get the associated method, because
1291      * higher level functions such as EVP_get_cipherbyname() have changed
1292      * to look at providers too.
1293      */
1294     const void *legacy_method = OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);
1295
1296     if (*legacy_nid == -1)       /* We found a clash already */
1297         return;
1298     if (legacy_method == NULL)
1299         return;
1300     nid = EVP_CIPHER_nid(legacy_method);
1301     if (*legacy_nid != NID_undef && *legacy_nid != nid) {
1302         *legacy_nid = -1;
1303         return;
1304     }
1305     *legacy_nid = nid;
1306 }
1307 #endif
1308
1309 static void *evp_cipher_from_dispatch(const int name_id,
1310                                       const OSSL_DISPATCH *fns,
1311                                       OSSL_PROVIDER *prov)
1312 {
1313     EVP_CIPHER *cipher = NULL;
1314     int fnciphcnt = 0, fnctxcnt = 0;
1315
1316     if ((cipher = evp_cipher_new()) == NULL) {
1317         EVPerr(0, ERR_R_MALLOC_FAILURE);
1318         return NULL;
1319     }
1320
1321 #ifndef FIPS_MODULE
1322     /* TODO(3.x) get rid of the need for legacy NIDs */
1323     cipher->nid = NID_undef;
1324     evp_names_do_all(prov, name_id, set_legacy_nid, &cipher->nid);
1325     if (cipher->nid == -1) {
1326         ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
1327         EVP_CIPHER_free(cipher);
1328         return NULL;
1329     }
1330 #endif
1331
1332     cipher->name_id = name_id;
1333
1334     for (; fns->function_id != 0; fns++) {
1335         switch (fns->function_id) {
1336         case OSSL_FUNC_CIPHER_NEWCTX:
1337             if (cipher->newctx != NULL)
1338                 break;
1339             cipher->newctx = OSSL_FUNC_cipher_newctx(fns);
1340             fnctxcnt++;
1341             break;
1342         case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1343             if (cipher->einit != NULL)
1344                 break;
1345             cipher->einit = OSSL_FUNC_cipher_encrypt_init(fns);
1346             fnciphcnt++;
1347             break;
1348         case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1349             if (cipher->dinit != NULL)
1350                 break;
1351             cipher->dinit = OSSL_FUNC_cipher_decrypt_init(fns);
1352             fnciphcnt++;
1353             break;
1354         case OSSL_FUNC_CIPHER_UPDATE:
1355             if (cipher->cupdate != NULL)
1356                 break;
1357             cipher->cupdate = OSSL_FUNC_cipher_update(fns);
1358             fnciphcnt++;
1359             break;
1360         case OSSL_FUNC_CIPHER_FINAL:
1361             if (cipher->cfinal != NULL)
1362                 break;
1363             cipher->cfinal = OSSL_FUNC_cipher_final(fns);
1364             fnciphcnt++;
1365             break;
1366         case OSSL_FUNC_CIPHER_CIPHER:
1367             if (cipher->ccipher != NULL)
1368                 break;
1369             cipher->ccipher = OSSL_FUNC_cipher_cipher(fns);
1370             break;
1371         case OSSL_FUNC_CIPHER_FREECTX:
1372             if (cipher->freectx != NULL)
1373                 break;
1374             cipher->freectx = OSSL_FUNC_cipher_freectx(fns);
1375             fnctxcnt++;
1376             break;
1377         case OSSL_FUNC_CIPHER_DUPCTX:
1378             if (cipher->dupctx != NULL)
1379                 break;
1380             cipher->dupctx = OSSL_FUNC_cipher_dupctx(fns);
1381             break;
1382         case OSSL_FUNC_CIPHER_GET_PARAMS:
1383             if (cipher->get_params != NULL)
1384                 break;
1385             cipher->get_params = OSSL_FUNC_cipher_get_params(fns);
1386             break;
1387         case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1388             if (cipher->get_ctx_params != NULL)
1389                 break;
1390             cipher->get_ctx_params = OSSL_FUNC_cipher_get_ctx_params(fns);
1391             break;
1392         case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1393             if (cipher->set_ctx_params != NULL)
1394                 break;
1395             cipher->set_ctx_params = OSSL_FUNC_cipher_set_ctx_params(fns);
1396             break;
1397         case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1398             if (cipher->gettable_params != NULL)
1399                 break;
1400             cipher->gettable_params = OSSL_FUNC_cipher_gettable_params(fns);
1401             break;
1402         case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1403             if (cipher->gettable_ctx_params != NULL)
1404                 break;
1405             cipher->gettable_ctx_params =
1406                 OSSL_FUNC_cipher_gettable_ctx_params(fns);
1407             break;
1408         case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1409             if (cipher->settable_ctx_params != NULL)
1410                 break;
1411             cipher->settable_ctx_params =
1412                 OSSL_FUNC_cipher_settable_ctx_params(fns);
1413             break;
1414         }
1415     }
1416     if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1417             || (fnciphcnt == 0 && cipher->ccipher == NULL)
1418             || fnctxcnt != 2) {
1419         /*
1420          * In order to be a consistent set of functions we must have at least
1421          * a complete set of "encrypt" functions, or a complete set of "decrypt"
1422          * functions, or a single "cipher" function. In all cases we need both
1423          * the "newctx" and "freectx" functions.
1424          */
1425         EVP_CIPHER_free(cipher);
1426         EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1427         return NULL;
1428     }
1429     cipher->prov = prov;
1430     if (prov != NULL)
1431         ossl_provider_up_ref(prov);
1432
1433     return cipher;
1434 }
1435
1436 static int evp_cipher_up_ref(void *cipher)
1437 {
1438     return EVP_CIPHER_up_ref(cipher);
1439 }
1440
1441 static void evp_cipher_free(void *cipher)
1442 {
1443     EVP_CIPHER_free(cipher);
1444 }
1445
1446 EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
1447                              const char *properties)
1448 {
1449     EVP_CIPHER *cipher =
1450         evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1451                           evp_cipher_from_dispatch, evp_cipher_up_ref,
1452                           evp_cipher_free);
1453
1454     if (cipher != NULL && !evp_cipher_cache_constants(cipher)) {
1455         EVP_CIPHER_free(cipher);
1456         cipher = NULL;
1457     }
1458     return cipher;
1459 }
1460
1461 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1462 {
1463     int ref = 0;
1464
1465     CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1466     return 1;
1467 }
1468
1469 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1470 {
1471     int i;
1472
1473     if (cipher == NULL)
1474         return;
1475
1476     CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1477     if (i > 0)
1478         return;
1479     ossl_provider_free(cipher->prov);
1480     CRYPTO_THREAD_lock_free(cipher->lock);
1481     OPENSSL_free(cipher);
1482 }
1483
1484 void EVP_CIPHER_do_all_provided(OPENSSL_CTX *libctx,
1485                                 void (*fn)(EVP_CIPHER *mac, void *arg),
1486                                 void *arg)
1487 {
1488     evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1489                        (void (*)(void *, void *))fn, arg,
1490                        evp_cipher_from_dispatch, evp_cipher_free);
1491 }