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 /* We need to use some engine deprecated APIs */
  11 #define OPENSSL_SUPPRESS_DEPRECATED
  12
  13 #include <stdio.h>
  14 #include <assert.h>
  15 #include "internal/cryptlib.h"
  16 #include <openssl/evp.h>
  17 #include <openssl/err.h>
  18 #include <openssl/rand.h>
  19 #include <openssl/engine.h>
  20 #include <openssl/params.h>
  21 #include <openssl/core_names.h>
  22 #include "crypto/evp.h"
  23 #include "internal/provider.h"
  24 #include "evp_local.h"
  25
  26 int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx)
  27 {
  28     if (ctx == NULL)
  29         return 1;
  30
  31     if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
  32         goto legacy;
  33
  34     if (ctx->provctx != NULL) {
  35         if (ctx->cipher->freectx != NULL)
  36             ctx->cipher->freectx(ctx->provctx);
  37         ctx->provctx = NULL;
  38     }
  39     if (ctx->fetched_cipher != NULL)
  40         EVP_CIPHER_free(ctx->fetched_cipher);
  41     memset(ctx, 0, sizeof(*ctx));
  42
  43     return 1;
  44
  45     /* TODO(3.0): Remove legacy code below */
  46  legacy:
  47
  48     if (ctx->cipher != NULL) {
  49         if (ctx->cipher->cleanup && !ctx->cipher->cleanup(ctx))
  50             return 0;
  51         /* Cleanse cipher context data */
  52         if (ctx->cipher_data && ctx->cipher->ctx_size)
  53             OPENSSL_cleanse(ctx->cipher_data, ctx->cipher->ctx_size);
  54     }
  55     OPENSSL_free(ctx->cipher_data);
  56 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
  57     ENGINE_finish(ctx->engine);
  58 #endif
  59     memset(ctx, 0, sizeof(*ctx));
  60     return 1;
  61 }
  62
  63 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
  64 {
  65     return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
  66 }
  67
  68 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
  69 {
  70     EVP_CIPHER_CTX_reset(ctx);
  71     OPENSSL_free(ctx);
  72 }
  73
  74 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
  75                    const unsigned char *key, const unsigned char *iv, int enc)
  76 {
  77     if (cipher != NULL)
  78         EVP_CIPHER_CTX_reset(ctx);
  79     return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
  80 }
  81
  82 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
  83                       ENGINE *impl, const unsigned char *key,
  84                       const unsigned char *iv, int enc)
  85 {
  86 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
  87     ENGINE *tmpimpl = NULL;
  88 #endif
  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_MODULE)
 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_MODULE)
 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      * Ensure a context left lying around from last time is cleared
 142      * (legacy code)
 143      */
 144     if (cipher != NULL && ctx->cipher != NULL) {
 145         OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
 146         ctx->cipher_data = NULL;
 147     }
 148
 149
 150     /* TODO(3.0): Start of non-legacy code below */
 151
 152     /* Ensure a context left lying around from last time is cleared */
 153     if (cipher != NULL && ctx->cipher != NULL) {
 154         unsigned long flags = ctx->flags;
 155
 156         EVP_CIPHER_CTX_reset(ctx);
 157         /* Restore encrypt and flags */
 158         ctx->encrypt = enc;
 159         ctx->flags = flags;
 160     }
 161
 162     if (cipher == NULL)
 163         cipher = ctx->cipher;
 164
 165     if (cipher->prov == NULL) {
 166 #ifdef FIPS_MODULE
 167         /* We only do explicit fetches inside the FIPS module */
 168         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 169         return 0;
 170 #else
 171         EVP_CIPHER *provciph =
 172             EVP_CIPHER_fetch(NULL,
 173                              cipher->nid == NID_undef ? "NULL"
 174                                                       : OBJ_nid2sn(cipher->nid),
 175                              "");
 176
 177         if (provciph == NULL)
 178             return 0;
 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_AEAD_SET_IVLEN:
 973         if (arg < 0)
 974             return 0;
 975         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
 976         break;
 977     case EVP_CTRL_AEAD_SET_IV_FIXED:
 978         params[0] = OSSL_PARAM_construct_octet_string(
 979                         OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED, ptr, sz);
 980         break;
 981     case EVP_CTRL_GCM_IV_GEN:
 982         set_params = 0;
 983         if (arg < 0)
 984             sz = 0; /* special case that uses the iv length */
 985         params[0] = OSSL_PARAM_construct_octet_string(
 986                         OSSL_CIPHER_PARAM_AEAD_TLS1_GET_IV_GEN, ptr, sz);
 987         break;
 988     case EVP_CTRL_GCM_SET_IV_INV:
 989         if (arg < 0)
 990             return 0;
 991         params[0] = OSSL_PARAM_construct_octet_string(
 992                         OSSL_CIPHER_PARAM_AEAD_TLS1_SET_IV_INV, ptr, sz);
 993         break;
 994     case EVP_CTRL_GET_RC5_ROUNDS:
 995         set_params = 0; /* Fall thru */
 996     case EVP_CTRL_SET_RC5_ROUNDS:
 997         if (arg < 0)
 998             return 0;
 999         i = (unsigned int)arg;
1000         params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_ROUNDS, &i);
1001         break;
1002     case EVP_CTRL_SET_SPEED:
1003         if (arg < 0)
1004             return 0;
1005         i = (unsigned int)arg;
1006         params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_SPEED, &i);
1007         break;
1008     case EVP_CTRL_AEAD_GET_TAG:
1009         set_params = 0; /* Fall thru */
1010     case EVP_CTRL_AEAD_SET_TAG:
1011         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1012                                                       ptr, sz);
1013         break;
1014     case EVP_CTRL_AEAD_TLS1_AAD:
1015         /* This one does a set and a get - since it returns a size */
1016         params[0] =
1017             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1018                                               ptr, sz);
1019         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1020         if (ret <= 0)
1021             goto end;
1022         params[0] =
1023             OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1024         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1025         if (ret <= 0)
1026             goto end;
1027         return sz;
1028 #ifndef OPENSSL_NO_RC2
1029     case EVP_CTRL_GET_RC2_KEY_BITS:
1030         set_params = 0; /* Fall thru */
1031     case EVP_CTRL_SET_RC2_KEY_BITS:
1032         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, &sz);
1033         break;
1034 #endif /* OPENSSL_NO_RC2 */
1035 #if !defined(OPENSSL_NO_MULTIBLOCK)
1036     case EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE:
1037         params[0] = OSSL_PARAM_construct_size_t(
1038                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_SEND_FRAGMENT, &sz);
1039         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1040         if (ret <= 0)
1041             return 0;
1042
1043         params[0] = OSSL_PARAM_construct_size_t(
1044                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_BUFSIZE, &sz);
1045         params[1] = OSSL_PARAM_construct_end();
1046         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1047         if (ret <= 0)
1048             return 0;
1049         return sz;
1050     case EVP_CTRL_TLS1_1_MULTIBLOCK_AAD: {
1051         EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *p =
1052             (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *)ptr;
1053
1054         if (arg < (int)sizeof(EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM))
1055             return 0;
1056
1057         params[0] = OSSL_PARAM_construct_octet_string(
1058                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD, (void*)p->inp, p->len);
1059         params[1] = OSSL_PARAM_construct_uint(
1060                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1061         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1062         if (ret <= 0)
1063             return ret;
1064         /* Retrieve the return values changed by the set */
1065         params[0] = OSSL_PARAM_construct_size_t(
1066                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD_PACKLEN, &sz);
1067         params[1] = OSSL_PARAM_construct_uint(
1068                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1069         params[2] = OSSL_PARAM_construct_end();
1070         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1071         if (ret <= 0)
1072             return 0;
1073         return sz;
1074     }
1075     case EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT: {
1076         EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *p =
1077             (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *)ptr;
1078
1079         params[0] = OSSL_PARAM_construct_octet_string(
1080                         OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC, p->out, p->len);
1081
1082         params[1] = OSSL_PARAM_construct_octet_string(
1083                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_IN, (void*)p->inp,
1084                 p->len);
1085         params[2] = OSSL_PARAM_construct_uint(
1086                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1087         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1088         if (ret <= 0)
1089             return ret;
1090         params[0] = OSSL_PARAM_construct_size_t(
1091                         OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_LEN, &sz);
1092         params[1] = OSSL_PARAM_construct_end();
1093         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1094         if (ret <= 0)
1095             return 0;
1096         return sz;
1097     }
1098 #endif /* OPENSSL_NO_MULTIBLOCK */
1099     case EVP_CTRL_AEAD_SET_MAC_KEY:
1100         if (arg < 0)
1101             return -1;
1102         params[0] = OSSL_PARAM_construct_octet_string(
1103                 OSSL_CIPHER_PARAM_AEAD_MAC_KEY, ptr, sz);
1104         break;
1105     }
1106
1107     if (set_params)
1108         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
1109     else
1110         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
1111     goto end;
1112
1113 /* TODO(3.0): Remove legacy code below */
1114 legacy:
1115     if (ctx->cipher->ctrl == NULL) {
1116         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
1117         return 0;
1118     }
1119
1120     ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1121
1122  end:
1123     if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1124         EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
1125                EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1126         return 0;
1127     }
1128     return ret;
1129 }
1130
1131 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1132 {
1133     if (cipher != NULL && cipher->get_params != NULL)
1134         return cipher->get_params(params);
1135     return 0;
1136 }
1137
1138 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1139 {
1140     if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1141         return ctx->cipher->set_ctx_params(ctx->provctx, params);
1142     return 0;
1143 }
1144
1145 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1146 {
1147     if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1148         return ctx->cipher->get_ctx_params(ctx->provctx, params);
1149     return 0;
1150 }
1151
1152 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1153 {
1154     if (cipher != NULL && cipher->gettable_params != NULL)
1155         return cipher->gettable_params(
1156                    ossl_provider_ctx(EVP_CIPHER_provider(cipher)));
1157     return NULL;
1158 }
1159
1160 const OSSL_PARAM *EVP_CIPHER_settable_ctx_params(const EVP_CIPHER *cipher)
1161 {
1162     if (cipher != NULL && cipher->settable_ctx_params != NULL)
1163         return cipher->settable_ctx_params(
1164                    ossl_provider_ctx(EVP_CIPHER_provider(cipher)));
1165     return NULL;
1166 }
1167
1168 const OSSL_PARAM *EVP_CIPHER_gettable_ctx_params(const EVP_CIPHER *cipher)
1169 {
1170     if (cipher != NULL && cipher->gettable_ctx_params != NULL)
1171         return cipher->gettable_ctx_params(
1172                    ossl_provider_ctx(EVP_CIPHER_provider(cipher)));
1173     return NULL;
1174 }
1175
1176 #ifndef FIPS_MODULE
1177 static OSSL_LIB_CTX *EVP_CIPHER_CTX_get_libctx(EVP_CIPHER_CTX *ctx)
1178 {
1179     const EVP_CIPHER *cipher = ctx->cipher;
1180     const OSSL_PROVIDER *prov;
1181
1182     if (cipher == NULL)
1183         return NULL;
1184
1185     prov = EVP_CIPHER_provider(cipher);
1186     return ossl_provider_library_context(prov);
1187 }
1188 #endif
1189
1190 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1191 {
1192     if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1193         return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1194
1195 #ifdef FIPS_MODULE
1196     return 0;
1197 #else
1198     {
1199         int kl;
1200         OSSL_LIB_CTX *libctx = EVP_CIPHER_CTX_get_libctx(ctx);
1201
1202         kl = EVP_CIPHER_CTX_key_length(ctx);
1203         if (kl <= 0 || RAND_priv_bytes_ex(libctx, key, kl) <= 0)
1204             return 0;
1205         return 1;
1206     }
1207 #endif /* FIPS_MODULE */
1208 }
1209
1210 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1211 {
1212     if ((in == NULL) || (in->cipher == NULL)) {
1213         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
1214         return 0;
1215     }
1216
1217     if (in->cipher->prov == NULL)
1218         goto legacy;
1219
1220     if (in->cipher->dupctx == NULL) {
1221         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1222         return 0;
1223     }
1224
1225     EVP_CIPHER_CTX_reset(out);
1226
1227     *out = *in;
1228     out->provctx = NULL;
1229
1230     if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1231         out->fetched_cipher = NULL;
1232         return 0;
1233     }
1234
1235     out->provctx = in->cipher->dupctx(in->provctx);
1236     if (out->provctx == NULL) {
1237         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
1238         return 0;
1239     }
1240
1241     return 1;
1242
1243     /* TODO(3.0): Remove legacy code below */
1244  legacy:
1245
1246 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
1247     /* Make sure it's safe to copy a cipher context using an ENGINE */
1248     if (in->engine && !ENGINE_init(in->engine)) {
1249         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
1250         return 0;
1251     }
1252 #endif
1253
1254     EVP_CIPHER_CTX_reset(out);
1255     memcpy(out, in, sizeof(*out));
1256
1257     if (in->cipher_data && in->cipher->ctx_size) {
1258         out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1259         if (out->cipher_data == NULL) {
1260             out->cipher = NULL;
1261             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
1262             return 0;
1263         }
1264         memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1265     }
1266
1267     if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1268         if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1269             out->cipher = NULL;
1270             EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
1271             return 0;
1272         }
1273     return 1;
1274 }
1275
1276 EVP_CIPHER *evp_cipher_new(void)
1277 {
1278     EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1279
1280     if (cipher != NULL) {
1281         cipher->lock = CRYPTO_THREAD_lock_new();
1282         if (cipher->lock == NULL) {
1283             OPENSSL_free(cipher);
1284             return NULL;
1285         }
1286         cipher->refcnt = 1;
1287     }
1288     return cipher;
1289 }
1290
1291 /*
1292  * FIPS module note: since internal fetches will be entirely
1293  * provider based, we know that none of its code depends on legacy
1294  * NIDs or any functionality that use them.
1295  */
1296 #ifndef FIPS_MODULE
1297 /* TODO(3.x) get rid of the need for legacy NIDs */
1298 static void set_legacy_nid(const char *name, void *vlegacy_nid)
1299 {
1300     int nid;
1301     int *legacy_nid = vlegacy_nid;
1302     /*
1303      * We use lowest level function to get the associated method, because
1304      * higher level functions such as EVP_get_cipherbyname() have changed
1305      * to look at providers too.
1306      */
1307     const void *legacy_method = OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);
1308
1309     if (*legacy_nid == -1)       /* We found a clash already */
1310         return;
1311     if (legacy_method == NULL)
1312         return;
1313     nid = EVP_CIPHER_nid(legacy_method);
1314     if (*legacy_nid != NID_undef && *legacy_nid != nid) {
1315         *legacy_nid = -1;
1316         return;
1317     }
1318     *legacy_nid = nid;
1319 }
1320 #endif
1321
1322 static void *evp_cipher_from_dispatch(const int name_id,
1323                                       const OSSL_DISPATCH *fns,
1324                                       OSSL_PROVIDER *prov)
1325 {
1326     EVP_CIPHER *cipher = NULL;
1327     int fnciphcnt = 0, fnctxcnt = 0;
1328
1329     if ((cipher = evp_cipher_new()) == NULL) {
1330         EVPerr(0, ERR_R_MALLOC_FAILURE);
1331         return NULL;
1332     }
1333
1334 #ifndef FIPS_MODULE
1335     /* TODO(3.x) get rid of the need for legacy NIDs */
1336     cipher->nid = NID_undef;
1337     evp_names_do_all(prov, name_id, set_legacy_nid, &cipher->nid);
1338     if (cipher->nid == -1) {
1339         ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
1340         EVP_CIPHER_free(cipher);
1341         return NULL;
1342     }
1343 #endif
1344
1345     cipher->name_id = name_id;
1346
1347     for (; fns->function_id != 0; fns++) {
1348         switch (fns->function_id) {
1349         case OSSL_FUNC_CIPHER_NEWCTX:
1350             if (cipher->newctx != NULL)
1351                 break;
1352             cipher->newctx = OSSL_FUNC_cipher_newctx(fns);
1353             fnctxcnt++;
1354             break;
1355         case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1356             if (cipher->einit != NULL)
1357                 break;
1358             cipher->einit = OSSL_FUNC_cipher_encrypt_init(fns);
1359             fnciphcnt++;
1360             break;
1361         case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1362             if (cipher->dinit != NULL)
1363                 break;
1364             cipher->dinit = OSSL_FUNC_cipher_decrypt_init(fns);
1365             fnciphcnt++;
1366             break;
1367         case OSSL_FUNC_CIPHER_UPDATE:
1368             if (cipher->cupdate != NULL)
1369                 break;
1370             cipher->cupdate = OSSL_FUNC_cipher_update(fns);
1371             fnciphcnt++;
1372             break;
1373         case OSSL_FUNC_CIPHER_FINAL:
1374             if (cipher->cfinal != NULL)
1375                 break;
1376             cipher->cfinal = OSSL_FUNC_cipher_final(fns);
1377             fnciphcnt++;
1378             break;
1379         case OSSL_FUNC_CIPHER_CIPHER:
1380             if (cipher->ccipher != NULL)
1381                 break;
1382             cipher->ccipher = OSSL_FUNC_cipher_cipher(fns);
1383             break;
1384         case OSSL_FUNC_CIPHER_FREECTX:
1385             if (cipher->freectx != NULL)
1386                 break;
1387             cipher->freectx = OSSL_FUNC_cipher_freectx(fns);
1388             fnctxcnt++;
1389             break;
1390         case OSSL_FUNC_CIPHER_DUPCTX:
1391             if (cipher->dupctx != NULL)
1392                 break;
1393             cipher->dupctx = OSSL_FUNC_cipher_dupctx(fns);
1394             break;
1395         case OSSL_FUNC_CIPHER_GET_PARAMS:
1396             if (cipher->get_params != NULL)
1397                 break;
1398             cipher->get_params = OSSL_FUNC_cipher_get_params(fns);
1399             break;
1400         case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1401             if (cipher->get_ctx_params != NULL)
1402                 break;
1403             cipher->get_ctx_params = OSSL_FUNC_cipher_get_ctx_params(fns);
1404             break;
1405         case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1406             if (cipher->set_ctx_params != NULL)
1407                 break;
1408             cipher->set_ctx_params = OSSL_FUNC_cipher_set_ctx_params(fns);
1409             break;
1410         case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1411             if (cipher->gettable_params != NULL)
1412                 break;
1413             cipher->gettable_params = OSSL_FUNC_cipher_gettable_params(fns);
1414             break;
1415         case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1416             if (cipher->gettable_ctx_params != NULL)
1417                 break;
1418             cipher->gettable_ctx_params =
1419                 OSSL_FUNC_cipher_gettable_ctx_params(fns);
1420             break;
1421         case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1422             if (cipher->settable_ctx_params != NULL)
1423                 break;
1424             cipher->settable_ctx_params =
1425                 OSSL_FUNC_cipher_settable_ctx_params(fns);
1426             break;
1427         }
1428     }
1429     if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1430             || (fnciphcnt == 0 && cipher->ccipher == NULL)
1431             || fnctxcnt != 2) {
1432         /*
1433          * In order to be a consistent set of functions we must have at least
1434          * a complete set of "encrypt" functions, or a complete set of "decrypt"
1435          * functions, or a single "cipher" function. In all cases we need both
1436          * the "newctx" and "freectx" functions.
1437          */
1438         EVP_CIPHER_free(cipher);
1439         EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1440         return NULL;
1441     }
1442     cipher->prov = prov;
1443     if (prov != NULL)
1444         ossl_provider_up_ref(prov);
1445
1446     return cipher;
1447 }
1448
1449 static int evp_cipher_up_ref(void *cipher)
1450 {
1451     return EVP_CIPHER_up_ref(cipher);
1452 }
1453
1454 static void evp_cipher_free(void *cipher)
1455 {
1456     EVP_CIPHER_free(cipher);
1457 }
1458
1459 EVP_CIPHER *EVP_CIPHER_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
1460                              const char *properties)
1461 {
1462     EVP_CIPHER *cipher =
1463         evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1464                           evp_cipher_from_dispatch, evp_cipher_up_ref,
1465                           evp_cipher_free);
1466
1467     if (cipher != NULL && !evp_cipher_cache_constants(cipher)) {
1468         EVP_CIPHER_free(cipher);
1469         cipher = NULL;
1470     }
1471     return cipher;
1472 }
1473
1474 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1475 {
1476     int ref = 0;
1477
1478     CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1479     return 1;
1480 }
1481
1482 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1483 {
1484     int i;
1485
1486     if (cipher == NULL)
1487         return;
1488
1489     CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1490     if (i > 0)
1491         return;
1492     ossl_provider_free(cipher->prov);
1493     CRYPTO_THREAD_lock_free(cipher->lock);
1494     OPENSSL_free(cipher);
1495 }
1496
1497 void EVP_CIPHER_do_all_provided(OSSL_LIB_CTX *libctx,
1498                                 void (*fn)(EVP_CIPHER *mac, void *arg),
1499                                 void *arg)
1500 {
1501     evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1502                        (void (*)(void *, void *))fn, arg,
1503                        evp_cipher_from_dispatch, evp_cipher_free);
1504 }