crypto/evp/evp_enc.c

   1 /*
   2  * Copyright 1995-2021 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 <limits.h>
  15 #include <assert.h>
  16 #include <openssl/evp.h>
  17 #include <openssl/err.h>
  18 #include <openssl/rand.h>
  19 #ifndef FIPS_MODULE
  20 # include <openssl/engine.h>
  21 #endif
  22 #include <openssl/params.h>
  23 #include <openssl/core_names.h>
  24 #include "internal/cryptlib.h"
  25 #include "internal/provider.h"
  26 #include "internal/core.h"
  27 #include "crypto/evp.h"
  28 #include "evp_local.h"
  29
  30 int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx)
  31 {
  32     if (ctx == NULL)
  33         return 1;
  34
  35     if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
  36         goto legacy;
  37
  38     if (ctx->algctx != NULL) {
  39         if (ctx->cipher->freectx != NULL)
  40             ctx->cipher->freectx(ctx->algctx);
  41         ctx->algctx = NULL;
  42     }
  43     if (ctx->fetched_cipher != NULL)
  44         EVP_CIPHER_free(ctx->fetched_cipher);
  45     memset(ctx, 0, sizeof(*ctx));
  46
  47     return 1;
  48
  49     /* Remove legacy code below when legacy support is removed. */
  50  legacy:
  51
  52     if (ctx->cipher != NULL) {
  53         if (ctx->cipher->cleanup && !ctx->cipher->cleanup(ctx))
  54             return 0;
  55         /* Cleanse cipher context data */
  56         if (ctx->cipher_data && ctx->cipher->ctx_size)
  57             OPENSSL_cleanse(ctx->cipher_data, ctx->cipher->ctx_size);
  58     }
  59     OPENSSL_free(ctx->cipher_data);
  60 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
  61     ENGINE_finish(ctx->engine);
  62 #endif
  63     memset(ctx, 0, sizeof(*ctx));
  64     return 1;
  65 }
  66
  67 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
  68 {
  69     return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
  70 }
  71
  72 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
  73 {
  74     if (ctx == NULL)
  75         return;
  76     EVP_CIPHER_CTX_reset(ctx);
  77     OPENSSL_free(ctx);
  78 }
  79
  80 static int evp_cipher_init_internal(EVP_CIPHER_CTX *ctx,
  81                                     const EVP_CIPHER *cipher,
  82                                     ENGINE *impl, const unsigned char *key,
  83                                     const unsigned char *iv, int enc,
  84                                     const OSSL_PARAM params[])
  85 {
  86     int n;
  87 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
  88     ENGINE *tmpimpl = NULL;
  89 #endif
  90     /*
  91      * enc == 1 means we are encrypting.
  92      * enc == 0 means we are decrypting.
  93      * enc == -1 means, use the previously initialised value for encrypt/decrypt
  94      */
  95     if (enc == -1) {
  96         enc = ctx->encrypt;
  97     } else {
  98         if (enc)
  99             enc = 1;
 100         ctx->encrypt = enc;
 101     }
 102
 103     if (cipher == NULL && ctx->cipher == NULL) {
 104         ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
 105         return 0;
 106     }
 107
 108     /* Code below to be removed when legacy support is dropped. */
 109
 110 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
 111     /*
 112      * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
 113      * this context may already have an ENGINE! Try to avoid releasing the
 114      * previous handle, re-querying for an ENGINE, and having a
 115      * reinitialisation, when it may all be unnecessary.
 116      */
 117     if (ctx->engine && ctx->cipher
 118         && (cipher == NULL || cipher->nid == ctx->cipher->nid))
 119         goto skip_to_init;
 120
 121     if (cipher != NULL && impl == NULL) {
 122          /* Ask if an ENGINE is reserved for this job */
 123         tmpimpl = ENGINE_get_cipher_engine(cipher->nid);
 124     }
 125 #endif
 126
 127     /*
 128      * If there are engines involved then we should use legacy handling for now.
 129      */
 130     if (ctx->engine != NULL
 131 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
 132             || tmpimpl != NULL
 133 #endif
 134             || impl != NULL) {
 135         if (ctx->cipher == ctx->fetched_cipher)
 136             ctx->cipher = NULL;
 137         EVP_CIPHER_free(ctx->fetched_cipher);
 138         ctx->fetched_cipher = NULL;
 139         goto legacy;
 140     }
 141     /*
 142      * Ensure a context left lying around from last time is cleared
 143      * (legacy code)
 144      */
 145     if (cipher != NULL && ctx->cipher != NULL) {
 146         OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
 147         ctx->cipher_data = NULL;
 148     }
 149
 150
 151     /* Start of non-legacy code below */
 152
 153     /* Ensure a context left lying around from last time is cleared */
 154     if (cipher != NULL && ctx->cipher != NULL) {
 155         unsigned long flags = ctx->flags;
 156
 157         EVP_CIPHER_CTX_reset(ctx);
 158         /* Restore encrypt and flags */
 159         ctx->encrypt = enc;
 160         ctx->flags = flags;
 161     }
 162
 163     if (cipher == NULL)
 164         cipher = ctx->cipher;
 165
 166     if (cipher->prov == NULL) {
 167 #ifdef FIPS_MODULE
 168         /* We only do explicit fetches inside the FIPS module */
 169         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 170         return 0;
 171 #else
 172         EVP_CIPHER *provciph =
 173             EVP_CIPHER_fetch(NULL,
 174                              cipher->nid == NID_undef ? "NULL"
 175                                                       : OBJ_nid2sn(cipher->nid),
 176                              "");
 177
 178         if (provciph == NULL)
 179             return 0;
 180         cipher = provciph;
 181         EVP_CIPHER_free(ctx->fetched_cipher);
 182         ctx->fetched_cipher = provciph;
 183 #endif
 184     }
 185
 186     if (cipher->prov != NULL) {
 187         if (!EVP_CIPHER_up_ref((EVP_CIPHER *)cipher)) {
 188             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 189             return 0;
 190         }
 191         EVP_CIPHER_free(ctx->fetched_cipher);
 192         ctx->fetched_cipher = (EVP_CIPHER *)cipher;
 193     }
 194     ctx->cipher = cipher;
 195     if (ctx->algctx == NULL) {
 196         ctx->algctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
 197         if (ctx->algctx == NULL) {
 198             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 199             return 0;
 200         }
 201     }
 202
 203     if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
 204         /*
 205          * If this ctx was already set up for no padding then we need to tell
 206          * the new cipher about it.
 207          */
 208         if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
 209             return 0;
 210     }
 211
 212     if (enc) {
 213         if (ctx->cipher->einit == NULL) {
 214             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 215             return 0;
 216         }
 217
 218         return ctx->cipher->einit(ctx->algctx,
 219                                   key,
 220                                   key == NULL ? 0
 221                                               : EVP_CIPHER_CTX_get_key_length(ctx),
 222                                   iv,
 223                                   iv == NULL ? 0
 224                                              : EVP_CIPHER_CTX_get_iv_length(ctx),
 225                                   params);
 226     }
 227
 228     if (ctx->cipher->dinit == NULL) {
 229         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 230         return 0;
 231     }
 232
 233     return ctx->cipher->dinit(ctx->algctx,
 234                               key,
 235                               key == NULL ? 0
 236                                           : EVP_CIPHER_CTX_get_key_length(ctx),
 237                               iv,
 238                               iv == NULL ? 0
 239                                          : EVP_CIPHER_CTX_get_iv_length(ctx),
 240                                   params);
 241
 242     /* Code below to be removed when legacy support is dropped. */
 243  legacy:
 244
 245     if (cipher != NULL) {
 246         /*
 247          * Ensure a context left lying around from last time is cleared (we
 248          * previously attempted to avoid this if the same ENGINE and
 249          * EVP_CIPHER could be used).
 250          */
 251         if (ctx->cipher) {
 252             unsigned long flags = ctx->flags;
 253             EVP_CIPHER_CTX_reset(ctx);
 254             /* Restore encrypt and flags */
 255             ctx->encrypt = enc;
 256             ctx->flags = flags;
 257         }
 258 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
 259         if (impl != NULL) {
 260             if (!ENGINE_init(impl)) {
 261                 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 262                 return 0;
 263             }
 264         } else {
 265             impl = tmpimpl;
 266         }
 267         if (impl != NULL) {
 268             /* There's an ENGINE for this job ... (apparently) */
 269             const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
 270
 271             if (c == NULL) {
 272                 /*
 273                  * One positive side-effect of US's export control history,
 274                  * is that we should at least be able to avoid using US
 275                  * misspellings of "initialisation"?
 276                  */
 277                 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 278                 return 0;
 279             }
 280             /* We'll use the ENGINE's private cipher definition */
 281             cipher = c;
 282             /*
 283              * Store the ENGINE functional reference so we know 'cipher' came
 284              * from an ENGINE and we need to release it when done.
 285              */
 286             ctx->engine = impl;
 287         } else {
 288             ctx->engine = NULL;
 289         }
 290 #endif
 291
 292         ctx->cipher = cipher;
 293         if (ctx->cipher->ctx_size) {
 294             ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
 295             if (ctx->cipher_data == NULL) {
 296                 ctx->cipher = NULL;
 297                 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 298                 return 0;
 299             }
 300         } else {
 301             ctx->cipher_data = NULL;
 302         }
 303         ctx->key_len = cipher->key_len;
 304         /* Preserve wrap enable flag, zero everything else */
 305         ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
 306         if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
 307             if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
 308                 ctx->cipher = NULL;
 309                 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 310                 return 0;
 311             }
 312         }
 313     }
 314 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
 315  skip_to_init:
 316 #endif
 317     if (ctx->cipher == NULL)
 318         return 0;
 319
 320     /* we assume block size is a power of 2 in *cryptUpdate */
 321     OPENSSL_assert(ctx->cipher->block_size == 1
 322                    || ctx->cipher->block_size == 8
 323                    || ctx->cipher->block_size == 16);
 324
 325     if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
 326         && EVP_CIPHER_CTX_get_mode(ctx) == EVP_CIPH_WRAP_MODE) {
 327         ERR_raise(ERR_LIB_EVP, EVP_R_WRAP_MODE_NOT_ALLOWED);
 328         return 0;
 329     }
 330
 331     if ((EVP_CIPHER_get_flags(EVP_CIPHER_CTX_get0_cipher(ctx))
 332                 & EVP_CIPH_CUSTOM_IV) == 0) {
 333         switch (EVP_CIPHER_CTX_get_mode(ctx)) {
 334
 335         case EVP_CIPH_STREAM_CIPHER:
 336         case EVP_CIPH_ECB_MODE:
 337             break;
 338
 339         case EVP_CIPH_CFB_MODE:
 340         case EVP_CIPH_OFB_MODE:
 341
 342             ctx->num = 0;
 343             /* fall-through */
 344
 345         case EVP_CIPH_CBC_MODE:
 346             n = EVP_CIPHER_CTX_get_iv_length(ctx);
 347             if (!ossl_assert(n >= 0 && n <= (int)sizeof(ctx->iv)))
 348                     return 0;
 349             if (iv != NULL)
 350                 memcpy(ctx->oiv, iv, n);
 351             memcpy(ctx->iv, ctx->oiv, n);
 352             break;
 353
 354         case EVP_CIPH_CTR_MODE:
 355             ctx->num = 0;
 356             /* Don't reuse IV for CTR mode */
 357             if (iv != NULL) {
 358                 if ((n = EVP_CIPHER_CTX_get_iv_length(ctx)) <= 0)
 359                     return 0;
 360                 memcpy(ctx->iv, iv, n);
 361             }
 362             break;
 363
 364         default:
 365             return 0;
 366         }
 367     }
 368
 369     if (key != NULL || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 370         if (!ctx->cipher->init(ctx, key, iv, enc))
 371             return 0;
 372     }
 373     ctx->buf_len = 0;
 374     ctx->final_used = 0;
 375     ctx->block_mask = ctx->cipher->block_size - 1;
 376     return 1;
 377 }
 378
 379 int EVP_CipherInit_ex2(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 380                        const unsigned char *key, const unsigned char *iv,
 381                        int enc, const OSSL_PARAM params[])
 382 {
 383     return evp_cipher_init_internal(ctx, cipher, NULL, key, iv, enc, params);
 384 }
 385
 386 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 387                    const unsigned char *key, const unsigned char *iv, int enc)
 388 {
 389     if (cipher != NULL)
 390         EVP_CIPHER_CTX_reset(ctx);
 391     return evp_cipher_init_internal(ctx, cipher, NULL, key, iv, enc, NULL);
 392 }
 393
 394 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 395                       ENGINE *impl, const unsigned char *key,
 396                       const unsigned char *iv, int enc)
 397 {
 398     return evp_cipher_init_internal(ctx, cipher, impl, key, iv, enc, NULL);
 399 }
 400
 401 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 402                      const unsigned char *in, int inl)
 403 {
 404     if (ctx->encrypt)
 405         return EVP_EncryptUpdate(ctx, out, outl, in, inl);
 406     else
 407         return EVP_DecryptUpdate(ctx, out, outl, in, inl);
 408 }
 409
 410 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 411 {
 412     if (ctx->encrypt)
 413         return EVP_EncryptFinal_ex(ctx, out, outl);
 414     else
 415         return EVP_DecryptFinal_ex(ctx, out, outl);
 416 }
 417
 418 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 419 {
 420     if (ctx->encrypt)
 421         return EVP_EncryptFinal(ctx, out, outl);
 422     else
 423         return EVP_DecryptFinal(ctx, out, outl);
 424 }
 425
 426 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 427                     const unsigned char *key, const unsigned char *iv)
 428 {
 429     return EVP_CipherInit(ctx, cipher, key, iv, 1);
 430 }
 431
 432 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 433                        ENGINE *impl, const unsigned char *key,
 434                        const unsigned char *iv)
 435 {
 436     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 437 }
 438
 439 int EVP_EncryptInit_ex2(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 440                         const unsigned char *key, const unsigned char *iv,
 441                         const OSSL_PARAM params[])
 442 {
 443     return EVP_CipherInit_ex2(ctx, cipher, key, iv, 1, params);
 444 }
 445
 446 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 447                     const unsigned char *key, const unsigned char *iv)
 448 {
 449     return EVP_CipherInit(ctx, cipher, key, iv, 0);
 450 }
 451
 452 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 453                        ENGINE *impl, const unsigned char *key,
 454                        const unsigned char *iv)
 455 {
 456     return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 457 }
 458
 459 int EVP_DecryptInit_ex2(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 460                         const unsigned char *key, const unsigned char *iv,
 461                         const OSSL_PARAM params[])
 462 {
 463     return EVP_CipherInit_ex2(ctx, cipher, key, iv, 0, params);
 464 }
 465
 466 /*
 467  * According to the letter of standard difference between pointers
 468  * is specified to be valid only within same object. This makes
 469  * it formally challenging to determine if input and output buffers
 470  * are not partially overlapping with standard pointer arithmetic.
 471  */
 472 #ifdef PTRDIFF_T
 473 # undef PTRDIFF_T
 474 #endif
 475 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
 476 /*
 477  * Then we have VMS that distinguishes itself by adhering to
 478  * sizeof(size_t)==4 even in 64-bit builds, which means that
 479  * difference between two pointers might be truncated to 32 bits.
 480  * In the context one can even wonder how comparison for
 481  * equality is implemented. To be on the safe side we adhere to
 482  * PTRDIFF_T even for comparison for equality.
 483  */
 484 # define PTRDIFF_T uint64_t
 485 #else
 486 # define PTRDIFF_T size_t
 487 #endif
 488
 489 int ossl_is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
 490 {
 491     PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
 492     /*
 493      * Check for partially overlapping buffers. [Binary logical
 494      * operations are used instead of boolean to minimize number
 495      * of conditional branches.]
 496      */
 497     int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
 498                                                 (diff > (0 - (PTRDIFF_T)len)));
 499
 500     return overlapped;
 501 }
 502
 503 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
 504                                     unsigned char *out, int *outl,
 505                                     const unsigned char *in, int inl)
 506 {
 507     int i, j, bl, cmpl = inl;
 508
 509     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 510         cmpl = (cmpl + 7) / 8;
 511
 512     bl = ctx->cipher->block_size;
 513
 514     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 515         /* If block size > 1 then the cipher will have to do this check */
 516         if (bl == 1 && ossl_is_partially_overlapping(out, in, cmpl)) {
 517             ERR_raise(ERR_LIB_EVP, EVP_R_PARTIALLY_OVERLAPPING);
 518             return 0;
 519         }
 520
 521         i = ctx->cipher->do_cipher(ctx, out, in, inl);
 522         if (i < 0)
 523             return 0;
 524         else
 525             *outl = i;
 526         return 1;
 527     }
 528
 529     if (inl <= 0) {
 530         *outl = 0;
 531         return inl == 0;
 532     }
 533     if (ossl_is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
 534         ERR_raise(ERR_LIB_EVP, EVP_R_PARTIALLY_OVERLAPPING);
 535         return 0;
 536     }
 537
 538     if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
 539         if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
 540             *outl = inl;
 541             return 1;
 542         } else {
 543             *outl = 0;
 544             return 0;
 545         }
 546     }
 547     i = ctx->buf_len;
 548     OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
 549     if (i != 0) {
 550         if (bl - i > inl) {
 551             memcpy(&(ctx->buf[i]), in, inl);
 552             ctx->buf_len += inl;
 553             *outl = 0;
 554             return 1;
 555         } else {
 556             j = bl - i;
 557
 558             /*
 559              * Once we've processed the first j bytes from in, the amount of
 560              * data left that is a multiple of the block length is:
 561              * (inl - j) & ~(bl - 1)
 562              * We must ensure that this amount of data, plus the one block that
 563              * we process from ctx->buf does not exceed INT_MAX
 564              */
 565             if (((inl - j) & ~(bl - 1)) > INT_MAX - bl) {
 566                 ERR_raise(ERR_LIB_EVP, EVP_R_OUTPUT_WOULD_OVERFLOW);
 567                 return 0;
 568             }
 569             memcpy(&(ctx->buf[i]), in, j);
 570             inl -= j;
 571             in += j;
 572             if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
 573                 return 0;
 574             out += bl;
 575             *outl = bl;
 576         }
 577     } else
 578         *outl = 0;
 579     i = inl & (bl - 1);
 580     inl -= i;
 581     if (inl > 0) {
 582         if (!ctx->cipher->do_cipher(ctx, out, in, inl))
 583             return 0;
 584         *outl += inl;
 585     }
 586
 587     if (i != 0)
 588         memcpy(ctx->buf, &(in[inl]), i);
 589     ctx->buf_len = i;
 590     return 1;
 591 }
 592
 593
 594 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 595                       const unsigned char *in, int inl)
 596 {
 597     int ret;
 598     size_t soutl;
 599     int blocksize;
 600
 601     if (outl != NULL) {
 602         *outl = 0;
 603     } else {
 604         ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
 605         return 0;
 606     }
 607
 608     /* Prevent accidental use of decryption context when encrypting */
 609     if (!ctx->encrypt) {
 610         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
 611         return 0;
 612     }
 613
 614     if (ctx->cipher == NULL) {
 615         ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
 616         return 0;
 617     }
 618
 619     if (ctx->cipher->prov == NULL)
 620         goto legacy;
 621
 622     blocksize = ctx->cipher->block_size;
 623
 624     if (ctx->cipher->cupdate == NULL  || blocksize < 1) {
 625         ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
 626         return 0;
 627     }
 628     ret = ctx->cipher->cupdate(ctx->algctx, out, &soutl,
 629                                inl + (blocksize == 1 ? 0 : blocksize), in,
 630                                (size_t)inl);
 631
 632     if (ret) {
 633         if (soutl > INT_MAX) {
 634             ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
 635             return 0;
 636         }
 637         *outl = soutl;
 638     }
 639
 640     return ret;
 641
 642     /* Code below to be removed when legacy support is dropped. */
 643  legacy:
 644
 645     return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 646 }
 647
 648 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 649 {
 650     int ret;
 651     ret = EVP_EncryptFinal_ex(ctx, out, outl);
 652     return ret;
 653 }
 654
 655 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 656 {
 657     int n, ret;
 658     unsigned int i, b, bl;
 659     size_t soutl;
 660     int blocksize;
 661
 662     if (outl != NULL) {
 663         *outl = 0;
 664     } else {
 665         ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
 666         return 0;
 667     }
 668
 669     /* Prevent accidental use of decryption context when encrypting */
 670     if (!ctx->encrypt) {
 671         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
 672         return 0;
 673     }
 674
 675     if (ctx->cipher == NULL) {
 676         ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
 677         return 0;
 678     }
 679     if (ctx->cipher->prov == NULL)
 680         goto legacy;
 681
 682     blocksize = EVP_CIPHER_CTX_get_block_size(ctx);
 683
 684     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 685         ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
 686         return 0;
 687     }
 688
 689     ret = ctx->cipher->cfinal(ctx->algctx, out, &soutl,
 690                               blocksize == 1 ? 0 : blocksize);
 691
 692     if (ret) {
 693         if (soutl > INT_MAX) {
 694             ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
 695             return 0;
 696         }
 697         *outl = soutl;
 698     }
 699
 700     return ret;
 701
 702     /* Code below to be removed when legacy support is dropped. */
 703  legacy:
 704
 705     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 706         ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 707         if (ret < 0)
 708             return 0;
 709         else
 710             *outl = ret;
 711         return 1;
 712     }
 713
 714     b = ctx->cipher->block_size;
 715     OPENSSL_assert(b <= sizeof(ctx->buf));
 716     if (b == 1) {
 717         *outl = 0;
 718         return 1;
 719     }
 720     bl = ctx->buf_len;
 721     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 722         if (bl) {
 723             ERR_raise(ERR_LIB_EVP, EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 724             return 0;
 725         }
 726         *outl = 0;
 727         return 1;
 728     }
 729
 730     n = b - bl;
 731     for (i = bl; i < b; i++)
 732         ctx->buf[i] = n;
 733     ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
 734
 735     if (ret)
 736         *outl = b;
 737
 738     return ret;
 739 }
 740
 741 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 742                       const unsigned char *in, int inl)
 743 {
 744     int fix_len, cmpl = inl, ret;
 745     unsigned int b;
 746     size_t soutl;
 747     int blocksize;
 748
 749     if (outl != NULL) {
 750         *outl = 0;
 751     } else {
 752         ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
 753         return 0;
 754     }
 755
 756     /* Prevent accidental use of encryption context when decrypting */
 757     if (ctx->encrypt) {
 758         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
 759         return 0;
 760     }
 761
 762     if (ctx->cipher == NULL) {
 763         ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
 764         return 0;
 765     }
 766     if (ctx->cipher->prov == NULL)
 767         goto legacy;
 768
 769     blocksize = EVP_CIPHER_CTX_get_block_size(ctx);
 770
 771     if (ctx->cipher->cupdate == NULL || blocksize < 1) {
 772         ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
 773         return 0;
 774     }
 775     ret = ctx->cipher->cupdate(ctx->algctx, out, &soutl,
 776                                inl + (blocksize == 1 ? 0 : blocksize), in,
 777                                (size_t)inl);
 778
 779     if (ret) {
 780         if (soutl > INT_MAX) {
 781             ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
 782             return 0;
 783         }
 784         *outl = soutl;
 785     }
 786
 787     return ret;
 788
 789     /* Code below to be removed when legacy support is dropped. */
 790  legacy:
 791
 792     b = ctx->cipher->block_size;
 793
 794     if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 795         cmpl = (cmpl + 7) / 8;
 796
 797     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 798         if (b == 1 && ossl_is_partially_overlapping(out, in, cmpl)) {
 799             ERR_raise(ERR_LIB_EVP, EVP_R_PARTIALLY_OVERLAPPING);
 800             return 0;
 801         }
 802
 803         fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
 804         if (fix_len < 0) {
 805             *outl = 0;
 806             return 0;
 807         } else
 808             *outl = fix_len;
 809         return 1;
 810     }
 811
 812     if (inl <= 0) {
 813         *outl = 0;
 814         return inl == 0;
 815     }
 816
 817     if (ctx->flags & EVP_CIPH_NO_PADDING)
 818         return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
 819
 820     OPENSSL_assert(b <= sizeof(ctx->final));
 821
 822     if (ctx->final_used) {
 823         /* see comment about PTRDIFF_T comparison above */
 824         if (((PTRDIFF_T)out == (PTRDIFF_T)in)
 825             || ossl_is_partially_overlapping(out, in, b)) {
 826             ERR_raise(ERR_LIB_EVP, EVP_R_PARTIALLY_OVERLAPPING);
 827             return 0;
 828         }
 829         /*
 830          * final_used is only ever set if buf_len is 0. Therefore the maximum
 831          * length output we will ever see from evp_EncryptDecryptUpdate is
 832          * the maximum multiple of the block length that is <= inl, or just:
 833          * inl & ~(b - 1)
 834          * Since final_used has been set then the final output length is:
 835          * (inl & ~(b - 1)) + b
 836          * This must never exceed INT_MAX
 837          */
 838         if ((inl & ~(b - 1)) > INT_MAX - b) {
 839             ERR_raise(ERR_LIB_EVP, EVP_R_OUTPUT_WOULD_OVERFLOW);
 840             return 0;
 841         }
 842         memcpy(out, ctx->final, b);
 843         out += b;
 844         fix_len = 1;
 845     } else
 846         fix_len = 0;
 847
 848     if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
 849         return 0;
 850
 851     /*
 852      * if we have 'decrypted' a multiple of block size, make sure we have a
 853      * copy of this last block
 854      */
 855     if (b > 1 && !ctx->buf_len) {
 856         *outl -= b;
 857         ctx->final_used = 1;
 858         memcpy(ctx->final, &out[*outl], b);
 859     } else
 860         ctx->final_used = 0;
 861
 862     if (fix_len)
 863         *outl += b;
 864
 865     return 1;
 866 }
 867
 868 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 869 {
 870     int ret;
 871     ret = EVP_DecryptFinal_ex(ctx, out, outl);
 872     return ret;
 873 }
 874
 875 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 876 {
 877     int i, n;
 878     unsigned int b;
 879     size_t soutl;
 880     int ret;
 881     int blocksize;
 882
 883     if (outl != NULL) {
 884         *outl = 0;
 885     } else {
 886         ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
 887         return 0;
 888     }
 889
 890     /* Prevent accidental use of encryption context when decrypting */
 891     if (ctx->encrypt) {
 892         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
 893         return 0;
 894     }
 895
 896     if (ctx->cipher == NULL) {
 897         ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
 898         return 0;
 899     }
 900
 901     if (ctx->cipher->prov == NULL)
 902         goto legacy;
 903
 904     blocksize = EVP_CIPHER_CTX_get_block_size(ctx);
 905
 906     if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
 907         ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
 908         return 0;
 909     }
 910
 911     ret = ctx->cipher->cfinal(ctx->algctx, out, &soutl,
 912                               blocksize == 1 ? 0 : blocksize);
 913
 914     if (ret) {
 915         if (soutl > INT_MAX) {
 916             ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
 917             return 0;
 918         }
 919         *outl = soutl;
 920     }
 921
 922     return ret;
 923
 924     /* Code below to be removed when legacy support is dropped. */
 925  legacy:
 926
 927     *outl = 0;
 928     if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
 929         i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 930         if (i < 0)
 931             return 0;
 932         else
 933             *outl = i;
 934         return 1;
 935     }
 936
 937     b = ctx->cipher->block_size;
 938     if (ctx->flags & EVP_CIPH_NO_PADDING) {
 939         if (ctx->buf_len) {
 940             ERR_raise(ERR_LIB_EVP, EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 941             return 0;
 942         }
 943         *outl = 0;
 944         return 1;
 945     }
 946     if (b > 1) {
 947         if (ctx->buf_len || !ctx->final_used) {
 948             ERR_raise(ERR_LIB_EVP, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 949             return 0;
 950         }
 951         OPENSSL_assert(b <= sizeof(ctx->final));
 952
 953         /*
 954          * The following assumes that the ciphertext has been authenticated.
 955          * Otherwise it provides a padding oracle.
 956          */
 957         n = ctx->final[b - 1];
 958         if (n == 0 || n > (int)b) {
 959             ERR_raise(ERR_LIB_EVP, EVP_R_BAD_DECRYPT);
 960             return 0;
 961         }
 962         for (i = 0; i < n; i++) {
 963             if (ctx->final[--b] != n) {
 964                 ERR_raise(ERR_LIB_EVP, EVP_R_BAD_DECRYPT);
 965                 return 0;
 966             }
 967         }
 968         n = ctx->cipher->block_size - n;
 969         for (i = 0; i < n; i++)
 970             out[i] = ctx->final[i];
 971         *outl = n;
 972     } else
 973         *outl = 0;
 974     return 1;
 975 }
 976
 977 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
 978 {
 979     if (c->cipher->prov != NULL) {
 980         int ok;
 981         OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 982         size_t len = keylen;
 983
 984         if (EVP_CIPHER_CTX_get_key_length(c) == keylen)
 985             return 1;
 986
 987         /* Check the cipher actually understands this parameter */
 988         if (OSSL_PARAM_locate_const(EVP_CIPHER_settable_ctx_params(c->cipher),
 989                                     OSSL_CIPHER_PARAM_KEYLEN) == NULL)
 990             return 0;
 991
 992         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &len);
 993         ok = evp_do_ciph_ctx_setparams(c->cipher, c->algctx, params);
 994
 995         return ok > 0 ? 1 : 0;
 996     }
 997
 998     /* Code below to be removed when legacy support is dropped. */
 999
1000     /*
1001      * Note there have never been any built-in ciphers that define this flag
1002      * since it was first introduced.
1003      */
1004     if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
1005         return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
1006     if (EVP_CIPHER_CTX_get_key_length(c) == keylen)
1007         return 1;
1008     if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
1009         c->key_len = keylen;
1010         return 1;
1011     }
1012     ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
1013     return 0;
1014 }
1015
1016 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
1017 {
1018     int ok;
1019     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
1020     unsigned int pd = pad;
1021
1022     if (pad)
1023         ctx->flags &= ~EVP_CIPH_NO_PADDING;
1024     else
1025         ctx->flags |= EVP_CIPH_NO_PADDING;
1026
1027     if (ctx->cipher != NULL && ctx->cipher->prov == NULL)
1028         return 1;
1029     params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_PADDING, &pd);
1030     ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
1031
1032     return ok != 0;
1033 }
1034
1035 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
1036 {
1037     int ret = EVP_CTRL_RET_UNSUPPORTED;
1038     int set_params = 1;
1039     size_t sz = arg;
1040     unsigned int i;
1041     OSSL_PARAM params[4] = {
1042         OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END
1043     };
1044
1045     if (ctx == NULL || ctx->cipher == NULL) {
1046         ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
1047         return 0;
1048     }
1049
1050     if (ctx->cipher->prov == NULL)
1051         goto legacy;
1052
1053     switch (type) {
1054     case EVP_CTRL_SET_KEY_LENGTH:
1055         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &sz);
1056         break;
1057     case EVP_CTRL_RAND_KEY:      /* Used by DES */
1058         set_params = 0;
1059         params[0] =
1060             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY,
1061                                               ptr, sz);
1062         break;
1063
1064     case EVP_CTRL_INIT:
1065         /*
1066          * EVP_CTRL_INIT is purely legacy, no provider counterpart.
1067          * As a matter of fact, this should be dead code, but some caller
1068          * might still do a direct control call with this command, so...
1069          * Legacy methods return 1 except for exceptional circumstances, so
1070          * we do the same here to not be disruptive.
1071          */
1072         return 1;
1073     case EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS: /* Used by DASYNC */
1074     default:
1075         goto end;
1076     case EVP_CTRL_AEAD_SET_IVLEN:
1077         if (arg < 0)
1078             return 0;
1079         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
1080         break;
1081     case EVP_CTRL_CCM_SET_L:
1082         if (arg < 2 || arg > 8)
1083             return 0;
1084         sz = 15 - arg;
1085         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &sz);
1086         break;
1087     case EVP_CTRL_AEAD_SET_IV_FIXED:
1088         params[0] = OSSL_PARAM_construct_octet_string(
1089                         OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED, ptr, sz);
1090         break;
1091     case EVP_CTRL_GCM_IV_GEN:
1092         set_params = 0;
1093         if (arg < 0)
1094             sz = 0; /* special case that uses the iv length */
1095         params[0] = OSSL_PARAM_construct_octet_string(
1096                         OSSL_CIPHER_PARAM_AEAD_TLS1_GET_IV_GEN, ptr, sz);
1097         break;
1098     case EVP_CTRL_GCM_SET_IV_INV:
1099         if (arg < 0)
1100             return 0;
1101         params[0] = OSSL_PARAM_construct_octet_string(
1102                         OSSL_CIPHER_PARAM_AEAD_TLS1_SET_IV_INV, ptr, sz);
1103         break;
1104     case EVP_CTRL_GET_RC5_ROUNDS:
1105         set_params = 0; /* Fall thru */
1106     case EVP_CTRL_SET_RC5_ROUNDS:
1107         if (arg < 0)
1108             return 0;
1109         i = (unsigned int)arg;
1110         params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_ROUNDS, &i);
1111         break;
1112     case EVP_CTRL_SET_SPEED:
1113         if (arg < 0)
1114             return 0;
1115         i = (unsigned int)arg;
1116         params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_SPEED, &i);
1117         break;
1118     case EVP_CTRL_AEAD_GET_TAG:
1119         set_params = 0; /* Fall thru */
1120     case EVP_CTRL_AEAD_SET_TAG:
1121         params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
1122                                                       ptr, sz);
1123         break;
1124     case EVP_CTRL_AEAD_TLS1_AAD:
1125         /* This one does a set and a get - since it returns a size */
1126         params[0] =
1127             OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD,
1128                                               ptr, sz);
1129         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
1130         if (ret <= 0)
1131             goto end;
1132         params[0] =
1133             OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, &sz);
1134         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->algctx, params);
1135         if (ret <= 0)
1136             goto end;
1137         return sz;
1138 #ifndef OPENSSL_NO_RC2
1139     case EVP_CTRL_GET_RC2_KEY_BITS:
1140         set_params = 0; /* Fall thru */
1141     case EVP_CTRL_SET_RC2_KEY_BITS:
1142         params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, &sz);
1143         break;
1144 #endif /* OPENSSL_NO_RC2 */
1145 #if !defined(OPENSSL_NO_MULTIBLOCK)
1146     case EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE:
1147         params[0] = OSSL_PARAM_construct_size_t(
1148                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_SEND_FRAGMENT, &sz);
1149         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
1150         if (ret <= 0)
1151             return 0;
1152
1153         params[0] = OSSL_PARAM_construct_size_t(
1154                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_BUFSIZE, &sz);
1155         params[1] = OSSL_PARAM_construct_end();
1156         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->algctx, params);
1157         if (ret <= 0)
1158             return 0;
1159         return sz;
1160     case EVP_CTRL_TLS1_1_MULTIBLOCK_AAD: {
1161         EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *p =
1162             (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *)ptr;
1163
1164         if (arg < (int)sizeof(EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM))
1165             return 0;
1166
1167         params[0] = OSSL_PARAM_construct_octet_string(
1168                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD, (void*)p->inp, p->len);
1169         params[1] = OSSL_PARAM_construct_uint(
1170                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1171         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
1172         if (ret <= 0)
1173             return ret;
1174         /* Retrieve the return values changed by the set */
1175         params[0] = OSSL_PARAM_construct_size_t(
1176                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD_PACKLEN, &sz);
1177         params[1] = OSSL_PARAM_construct_uint(
1178                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1179         params[2] = OSSL_PARAM_construct_end();
1180         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->algctx, params);
1181         if (ret <= 0)
1182             return 0;
1183         return sz;
1184     }
1185     case EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT: {
1186         EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *p =
1187             (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *)ptr;
1188
1189         params[0] = OSSL_PARAM_construct_octet_string(
1190                         OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC, p->out, p->len);
1191
1192         params[1] = OSSL_PARAM_construct_octet_string(
1193                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_IN, (void*)p->inp,
1194                 p->len);
1195         params[2] = OSSL_PARAM_construct_uint(
1196                 OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, &p->interleave);
1197         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
1198         if (ret <= 0)
1199             return ret;
1200         params[0] = OSSL_PARAM_construct_size_t(
1201                         OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_LEN, &sz);
1202         params[1] = OSSL_PARAM_construct_end();
1203         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->algctx, params);
1204         if (ret <= 0)
1205             return 0;
1206         return sz;
1207     }
1208 #endif /* OPENSSL_NO_MULTIBLOCK */
1209     case EVP_CTRL_AEAD_SET_MAC_KEY:
1210         if (arg < 0)
1211             return -1;
1212         params[0] = OSSL_PARAM_construct_octet_string(
1213                 OSSL_CIPHER_PARAM_AEAD_MAC_KEY, ptr, sz);
1214         break;
1215     }
1216
1217     if (set_params)
1218         ret = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->algctx, params);
1219     else
1220         ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->algctx, params);
1221     goto end;
1222
1223     /* Code below to be removed when legacy support is dropped. */
1224 legacy:
1225     if (ctx->cipher->ctrl == NULL) {
1226         ERR_raise(ERR_LIB_EVP, EVP_R_CTRL_NOT_IMPLEMENTED);
1227         return 0;
1228     }
1229
1230     ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
1231
1232  end:
1233     if (ret == EVP_CTRL_RET_UNSUPPORTED) {
1234         ERR_raise(ERR_LIB_EVP, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
1235         return 0;
1236     }
1237     return ret;
1238 }
1239
1240 int EVP_CIPHER_get_params(EVP_CIPHER *cipher, OSSL_PARAM params[])
1241 {
1242     if (cipher != NULL && cipher->get_params != NULL)
1243         return cipher->get_params(params);
1244     return 0;
1245 }
1246
1247 int EVP_CIPHER_CTX_set_params(EVP_CIPHER_CTX *ctx, const OSSL_PARAM params[])
1248 {
1249     if (ctx->cipher != NULL && ctx->cipher->set_ctx_params != NULL)
1250         return ctx->cipher->set_ctx_params(ctx->algctx, params);
1251     return 0;
1252 }
1253
1254 int EVP_CIPHER_CTX_get_params(EVP_CIPHER_CTX *ctx, OSSL_PARAM params[])
1255 {
1256     if (ctx->cipher != NULL && ctx->cipher->get_ctx_params != NULL)
1257         return ctx->cipher->get_ctx_params(ctx->algctx, params);
1258     return 0;
1259 }
1260
1261 const OSSL_PARAM *EVP_CIPHER_gettable_params(const EVP_CIPHER *cipher)
1262 {
1263     if (cipher != NULL && cipher->gettable_params != NULL)
1264         return cipher->gettable_params(
1265                    ossl_provider_ctx(EVP_CIPHER_get0_provider(cipher)));
1266     return NULL;
1267 }
1268
1269 const OSSL_PARAM *EVP_CIPHER_settable_ctx_params(const EVP_CIPHER *cipher)
1270 {
1271     void *provctx;
1272
1273     if (cipher != NULL && cipher->settable_ctx_params != NULL) {
1274         provctx = ossl_provider_ctx(EVP_CIPHER_get0_provider(cipher));
1275         return cipher->settable_ctx_params(NULL, provctx);
1276     }
1277     return NULL;
1278 }
1279
1280 const OSSL_PARAM *EVP_CIPHER_gettable_ctx_params(const EVP_CIPHER *cipher)
1281 {
1282     void *provctx;
1283
1284     if (cipher != NULL && cipher->gettable_ctx_params != NULL) {
1285         provctx = ossl_provider_ctx(EVP_CIPHER_get0_provider(cipher));
1286         return cipher->gettable_ctx_params(NULL, provctx);
1287     }
1288     return NULL;
1289 }
1290
1291 const OSSL_PARAM *EVP_CIPHER_CTX_settable_params(EVP_CIPHER_CTX *cctx)
1292 {
1293     void *alg;
1294
1295     if (cctx != NULL && cctx->cipher->settable_ctx_params != NULL) {
1296         alg = ossl_provider_ctx(EVP_CIPHER_get0_provider(cctx->cipher));
1297         return cctx->cipher->settable_ctx_params(cctx->algctx, alg);
1298     }
1299     return NULL;
1300 }
1301
1302 const OSSL_PARAM *EVP_CIPHER_CTX_gettable_params(EVP_CIPHER_CTX *cctx)
1303 {
1304     void *provctx;
1305
1306     if (cctx != NULL && cctx->cipher->gettable_ctx_params != NULL) {
1307         provctx = ossl_provider_ctx(EVP_CIPHER_get0_provider(cctx->cipher));
1308         return cctx->cipher->gettable_ctx_params(cctx->algctx, provctx);
1309     }
1310     return NULL;
1311 }
1312
1313 #ifndef FIPS_MODULE
1314 static OSSL_LIB_CTX *EVP_CIPHER_CTX_get_libctx(EVP_CIPHER_CTX *ctx)
1315 {
1316     const EVP_CIPHER *cipher = ctx->cipher;
1317     const OSSL_PROVIDER *prov;
1318
1319     if (cipher == NULL)
1320         return NULL;
1321
1322     prov = EVP_CIPHER_get0_provider(cipher);
1323     return ossl_provider_libctx(prov);
1324 }
1325 #endif
1326
1327 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
1328 {
1329     if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
1330         return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
1331
1332 #ifdef FIPS_MODULE
1333     return 0;
1334 #else
1335     {
1336         int kl;
1337         OSSL_LIB_CTX *libctx = EVP_CIPHER_CTX_get_libctx(ctx);
1338
1339         kl = EVP_CIPHER_CTX_get_key_length(ctx);
1340         if (kl <= 0 || RAND_priv_bytes_ex(libctx, key, kl, 0) <= 0)
1341             return 0;
1342         return 1;
1343     }
1344 #endif /* FIPS_MODULE */
1345 }
1346
1347 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
1348 {
1349     if ((in == NULL) || (in->cipher == NULL)) {
1350         ERR_raise(ERR_LIB_EVP, EVP_R_INPUT_NOT_INITIALIZED);
1351         return 0;
1352     }
1353
1354     if (in->cipher->prov == NULL)
1355         goto legacy;
1356
1357     if (in->cipher->dupctx == NULL) {
1358         ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
1359         return 0;
1360     }
1361
1362     EVP_CIPHER_CTX_reset(out);
1363
1364     *out = *in;
1365     out->algctx = NULL;
1366
1367     if (in->fetched_cipher != NULL && !EVP_CIPHER_up_ref(in->fetched_cipher)) {
1368         out->fetched_cipher = NULL;
1369         return 0;
1370     }
1371
1372     out->algctx = in->cipher->dupctx(in->algctx);
1373     if (out->algctx == NULL) {
1374         ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
1375         return 0;
1376     }
1377
1378     return 1;
1379
1380     /* Code below to be removed when legacy support is dropped. */
1381  legacy:
1382
1383 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
1384     /* Make sure it's safe to copy a cipher context using an ENGINE */
1385     if (in->engine && !ENGINE_init(in->engine)) {
1386         ERR_raise(ERR_LIB_EVP, ERR_R_ENGINE_LIB);
1387         return 0;
1388     }
1389 #endif
1390
1391     EVP_CIPHER_CTX_reset(out);
1392     memcpy(out, in, sizeof(*out));
1393
1394     if (in->cipher_data && in->cipher->ctx_size) {
1395         out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
1396         if (out->cipher_data == NULL) {
1397             out->cipher = NULL;
1398             ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
1399             return 0;
1400         }
1401         memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
1402     }
1403
1404     if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
1405         if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
1406             out->cipher = NULL;
1407             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
1408             return 0;
1409         }
1410     return 1;
1411 }
1412
1413 EVP_CIPHER *evp_cipher_new(void)
1414 {
1415     EVP_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_CIPHER));
1416
1417     if (cipher != NULL) {
1418         cipher->lock = CRYPTO_THREAD_lock_new();
1419         if (cipher->lock == NULL) {
1420             OPENSSL_free(cipher);
1421             return NULL;
1422         }
1423         cipher->refcnt = 1;
1424     }
1425     return cipher;
1426 }
1427
1428 /*
1429  * FIPS module note: since internal fetches will be entirely
1430  * provider based, we know that none of its code depends on legacy
1431  * NIDs or any functionality that use them.
1432  */
1433 #ifndef FIPS_MODULE
1434 /* After removal of legacy support get rid of the need for legacy NIDs */
1435 static void set_legacy_nid(const char *name, void *vlegacy_nid)
1436 {
1437     int nid;
1438     int *legacy_nid = vlegacy_nid;
1439     /*
1440      * We use lowest level function to get the associated method, because
1441      * higher level functions such as EVP_get_cipherbyname() have changed
1442      * to look at providers too.
1443      */
1444     const void *legacy_method = OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);
1445
1446     if (*legacy_nid == -1)       /* We found a clash already */
1447         return;
1448     if (legacy_method == NULL)
1449         return;
1450     nid = EVP_CIPHER_get_nid(legacy_method);
1451     if (*legacy_nid != NID_undef && *legacy_nid != nid) {
1452         *legacy_nid = -1;
1453         return;
1454     }
1455     *legacy_nid = nid;
1456 }
1457 #endif
1458
1459 static void *evp_cipher_from_algorithm(const int name_id,
1460                                        const OSSL_ALGORITHM *algodef,
1461                                        OSSL_PROVIDER *prov)
1462 {
1463     const OSSL_DISPATCH *fns = algodef->implementation;
1464     EVP_CIPHER *cipher = NULL;
1465     int fnciphcnt = 0, fnctxcnt = 0;
1466
1467     if ((cipher = evp_cipher_new()) == NULL) {
1468         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
1469         return NULL;
1470     }
1471
1472 #ifndef FIPS_MODULE
1473     cipher->nid = NID_undef;
1474     if (!evp_names_do_all(prov, name_id, set_legacy_nid, &cipher->nid)
1475             || cipher->nid == -1) {
1476         ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
1477         EVP_CIPHER_free(cipher);
1478         return NULL;
1479     }
1480 #endif
1481
1482     cipher->name_id = name_id;
1483     if ((cipher->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
1484         EVP_CIPHER_free(cipher);
1485         return NULL;
1486     }
1487     cipher->description = algodef->algorithm_description;
1488
1489     for (; fns->function_id != 0; fns++) {
1490         switch (fns->function_id) {
1491         case OSSL_FUNC_CIPHER_NEWCTX:
1492             if (cipher->newctx != NULL)
1493                 break;
1494             cipher->newctx = OSSL_FUNC_cipher_newctx(fns);
1495             fnctxcnt++;
1496             break;
1497         case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
1498             if (cipher->einit != NULL)
1499                 break;
1500             cipher->einit = OSSL_FUNC_cipher_encrypt_init(fns);
1501             fnciphcnt++;
1502             break;
1503         case OSSL_FUNC_CIPHER_DECRYPT_INIT:
1504             if (cipher->dinit != NULL)
1505                 break;
1506             cipher->dinit = OSSL_FUNC_cipher_decrypt_init(fns);
1507             fnciphcnt++;
1508             break;
1509         case OSSL_FUNC_CIPHER_UPDATE:
1510             if (cipher->cupdate != NULL)
1511                 break;
1512             cipher->cupdate = OSSL_FUNC_cipher_update(fns);
1513             fnciphcnt++;
1514             break;
1515         case OSSL_FUNC_CIPHER_FINAL:
1516             if (cipher->cfinal != NULL)
1517                 break;
1518             cipher->cfinal = OSSL_FUNC_cipher_final(fns);
1519             fnciphcnt++;
1520             break;
1521         case OSSL_FUNC_CIPHER_CIPHER:
1522             if (cipher->ccipher != NULL)
1523                 break;
1524             cipher->ccipher = OSSL_FUNC_cipher_cipher(fns);
1525             break;
1526         case OSSL_FUNC_CIPHER_FREECTX:
1527             if (cipher->freectx != NULL)
1528                 break;
1529             cipher->freectx = OSSL_FUNC_cipher_freectx(fns);
1530             fnctxcnt++;
1531             break;
1532         case OSSL_FUNC_CIPHER_DUPCTX:
1533             if (cipher->dupctx != NULL)
1534                 break;
1535             cipher->dupctx = OSSL_FUNC_cipher_dupctx(fns);
1536             break;
1537         case OSSL_FUNC_CIPHER_GET_PARAMS:
1538             if (cipher->get_params != NULL)
1539                 break;
1540             cipher->get_params = OSSL_FUNC_cipher_get_params(fns);
1541             break;
1542         case OSSL_FUNC_CIPHER_GET_CTX_PARAMS:
1543             if (cipher->get_ctx_params != NULL)
1544                 break;
1545             cipher->get_ctx_params = OSSL_FUNC_cipher_get_ctx_params(fns);
1546             break;
1547         case OSSL_FUNC_CIPHER_SET_CTX_PARAMS:
1548             if (cipher->set_ctx_params != NULL)
1549                 break;
1550             cipher->set_ctx_params = OSSL_FUNC_cipher_set_ctx_params(fns);
1551             break;
1552         case OSSL_FUNC_CIPHER_GETTABLE_PARAMS:
1553             if (cipher->gettable_params != NULL)
1554                 break;
1555             cipher->gettable_params = OSSL_FUNC_cipher_gettable_params(fns);
1556             break;
1557         case OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS:
1558             if (cipher->gettable_ctx_params != NULL)
1559                 break;
1560             cipher->gettable_ctx_params =
1561                 OSSL_FUNC_cipher_gettable_ctx_params(fns);
1562             break;
1563         case OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS:
1564             if (cipher->settable_ctx_params != NULL)
1565                 break;
1566             cipher->settable_ctx_params =
1567                 OSSL_FUNC_cipher_settable_ctx_params(fns);
1568             break;
1569         }
1570     }
1571     if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
1572             || (fnciphcnt == 0 && cipher->ccipher == NULL)
1573             || fnctxcnt != 2) {
1574         /*
1575          * In order to be a consistent set of functions we must have at least
1576          * a complete set of "encrypt" functions, or a complete set of "decrypt"
1577          * functions, or a single "cipher" function. In all cases we need both
1578          * the "newctx" and "freectx" functions.
1579          */
1580         EVP_CIPHER_free(cipher);
1581         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1582         return NULL;
1583     }
1584     cipher->prov = prov;
1585     if (prov != NULL)
1586         ossl_provider_up_ref(prov);
1587
1588     if (!evp_cipher_cache_constants(cipher)) {
1589         EVP_CIPHER_free(cipher);
1590         ERR_raise(ERR_LIB_EVP, EVP_R_CACHE_CONSTANTS_FAILED);
1591         cipher = NULL;
1592     }
1593
1594     return cipher;
1595 }
1596
1597 static int evp_cipher_up_ref(void *cipher)
1598 {
1599     return EVP_CIPHER_up_ref(cipher);
1600 }
1601
1602 static void evp_cipher_free(void *cipher)
1603 {
1604     EVP_CIPHER_free(cipher);
1605 }
1606
1607 EVP_CIPHER *EVP_CIPHER_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
1608                              const char *properties)
1609 {
1610     EVP_CIPHER *cipher =
1611         evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
1612                           evp_cipher_from_algorithm, evp_cipher_up_ref,
1613                           evp_cipher_free);
1614
1615     return cipher;
1616 }
1617
1618 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher)
1619 {
1620     int ref = 0;
1621
1622     if (cipher->origin == EVP_ORIG_DYNAMIC)
1623         CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
1624     return 1;
1625 }
1626
1627 void evp_cipher_free_int(EVP_CIPHER *cipher)
1628 {
1629     OPENSSL_free(cipher->type_name);
1630     ossl_provider_free(cipher->prov);
1631     CRYPTO_THREAD_lock_free(cipher->lock);
1632     OPENSSL_free(cipher);
1633 }
1634
1635 void EVP_CIPHER_free(EVP_CIPHER *cipher)
1636 {
1637     int i;
1638
1639     if (cipher == NULL || cipher->origin != EVP_ORIG_DYNAMIC)
1640         return;
1641
1642     CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
1643     if (i > 0)
1644         return;
1645     evp_cipher_free_int(cipher);
1646 }
1647
1648 void EVP_CIPHER_do_all_provided(OSSL_LIB_CTX *libctx,
1649                                 void (*fn)(EVP_CIPHER *mac, void *arg),
1650                                 void *arg)
1651 {
1652     evp_generic_do_all(libctx, OSSL_OP_CIPHER,
1653                        (void (*)(void *, void *))fn, arg,
1654                        evp_cipher_from_algorithm, evp_cipher_up_ref,
1655                        evp_cipher_free);
1656 }