evp_enc.c revision 331638
1/* crypto/evp/evp_enc.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include <stdio.h> 60#include "cryptlib.h" 61#include <openssl/evp.h> 62#include <openssl/err.h> 63#include <openssl/rand.h> 64#ifndef OPENSSL_NO_ENGINE 65# include <openssl/engine.h> 66#endif 67#ifdef OPENSSL_FIPS 68# include <openssl/fips.h> 69#endif 70#include "evp_locl.h" 71 72#ifdef OPENSSL_FIPS 73# define M_do_cipher(ctx, out, in, inl) FIPS_cipher(ctx, out, in, inl) 74#else 75# define M_do_cipher(ctx, out, in, inl) ctx->cipher->do_cipher(ctx, out, in, inl) 76#endif 77 78const char EVP_version[] = "EVP" OPENSSL_VERSION_PTEXT; 79 80void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) 81{ 82 memset(ctx, 0, sizeof(EVP_CIPHER_CTX)); 83 /* ctx->cipher=NULL; */ 84} 85 86EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) 87{ 88 EVP_CIPHER_CTX *ctx = OPENSSL_malloc(sizeof(*ctx)); 89 if (ctx) 90 EVP_CIPHER_CTX_init(ctx); 91 return ctx; 92} 93 94int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 95 const unsigned char *key, const unsigned char *iv, int enc) 96{ 97 if (cipher) 98 EVP_CIPHER_CTX_init(ctx); 99 return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); 100} 101 102int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 103 ENGINE *impl, const unsigned char *key, 104 const unsigned char *iv, int enc) 105{ 106 if (enc == -1) 107 enc = ctx->encrypt; 108 else { 109 if (enc) 110 enc = 1; 111 ctx->encrypt = enc; 112 } 113#ifndef OPENSSL_NO_ENGINE 114 /* 115 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so 116 * this context may already have an ENGINE! Try to avoid releasing the 117 * previous handle, re-querying for an ENGINE, and having a 118 * reinitialisation, when it may all be unecessary. 119 */ 120 if (ctx->engine && ctx->cipher && (!cipher || 121 (cipher 122 && (cipher->nid == 123 ctx->cipher->nid)))) 124 goto skip_to_init; 125#endif 126 if (cipher) { 127 /* 128 * Ensure a context left lying around from last time is cleared (the 129 * previous check attempted to avoid this if the same ENGINE and 130 * EVP_CIPHER could be used). 131 */ 132 if (ctx->cipher) { 133 unsigned long flags = ctx->flags; 134 EVP_CIPHER_CTX_cleanup(ctx); 135 /* Restore encrypt and flags */ 136 ctx->encrypt = enc; 137 ctx->flags = flags; 138 } 139#ifndef OPENSSL_NO_ENGINE 140 if (impl) { 141 if (!ENGINE_init(impl)) { 142 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 143 return 0; 144 } 145 } else 146 /* Ask if an ENGINE is reserved for this job */ 147 impl = ENGINE_get_cipher_engine(cipher->nid); 148 if (impl) { 149 /* There's an ENGINE for this job ... (apparently) */ 150 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); 151 if (!c) { 152 /* 153 * One positive side-effect of US's export control history, 154 * is that we should at least be able to avoid using US 155 * mispellings of "initialisation"? 156 */ 157 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 158 return 0; 159 } 160 /* We'll use the ENGINE's private cipher definition */ 161 cipher = c; 162 /* 163 * Store the ENGINE functional reference so we know 'cipher' came 164 * from an ENGINE and we need to release it when done. 165 */ 166 ctx->engine = impl; 167 } else 168 ctx->engine = NULL; 169#endif 170 171#ifdef OPENSSL_FIPS 172 if (FIPS_mode()) { 173 const EVP_CIPHER *fcipher = NULL; 174 if (cipher) 175 fcipher = evp_get_fips_cipher(cipher); 176 if (fcipher) 177 cipher = fcipher; 178 return FIPS_cipherinit(ctx, cipher, key, iv, enc); 179 } 180#endif 181 ctx->cipher = cipher; 182 if (ctx->cipher->ctx_size) { 183 ctx->cipher_data = OPENSSL_malloc(ctx->cipher->ctx_size); 184 if (!ctx->cipher_data) { 185 ctx->cipher = NULL; 186 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); 187 return 0; 188 } 189 } else { 190 ctx->cipher_data = NULL; 191 } 192 ctx->key_len = cipher->key_len; 193 /* Preserve wrap enable flag, zero everything else */ 194 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; 195 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { 196 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { 197 ctx->cipher = NULL; 198 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 199 return 0; 200 } 201 } 202 } else if (!ctx->cipher) { 203 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); 204 return 0; 205 } 206#ifndef OPENSSL_NO_ENGINE 207 skip_to_init: 208#endif 209#ifdef OPENSSL_FIPS 210 if (FIPS_mode()) 211 return FIPS_cipherinit(ctx, cipher, key, iv, enc); 212#endif 213 /* we assume block size is a power of 2 in *cryptUpdate */ 214 OPENSSL_assert(ctx->cipher->block_size == 1 215 || ctx->cipher->block_size == 8 216 || ctx->cipher->block_size == 16); 217 218 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) 219 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { 220 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); 221 return 0; 222 } 223 224 if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { 225 switch (EVP_CIPHER_CTX_mode(ctx)) { 226 227 case EVP_CIPH_STREAM_CIPHER: 228 case EVP_CIPH_ECB_MODE: 229 break; 230 231 case EVP_CIPH_CFB_MODE: 232 case EVP_CIPH_OFB_MODE: 233 234 ctx->num = 0; 235 /* fall-through */ 236 237 case EVP_CIPH_CBC_MODE: 238 239 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= 240 (int)sizeof(ctx->iv)); 241 if (iv) 242 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 243 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); 244 break; 245 246 case EVP_CIPH_CTR_MODE: 247 ctx->num = 0; 248 /* Don't reuse IV for CTR mode */ 249 if (iv) 250 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 251 break; 252 253 default: 254 return 0; 255 break; 256 } 257 } 258 259 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { 260 if (!ctx->cipher->init(ctx, key, iv, enc)) 261 return 0; 262 } 263 ctx->buf_len = 0; 264 ctx->final_used = 0; 265 ctx->block_mask = ctx->cipher->block_size - 1; 266 return 1; 267} 268 269int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 270 const unsigned char *in, int inl) 271{ 272 if (ctx->encrypt) 273 return EVP_EncryptUpdate(ctx, out, outl, in, inl); 274 else 275 return EVP_DecryptUpdate(ctx, out, outl, in, inl); 276} 277 278int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 279{ 280 if (ctx->encrypt) 281 return EVP_EncryptFinal_ex(ctx, out, outl); 282 else 283 return EVP_DecryptFinal_ex(ctx, out, outl); 284} 285 286int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 287{ 288 if (ctx->encrypt) 289 return EVP_EncryptFinal(ctx, out, outl); 290 else 291 return EVP_DecryptFinal(ctx, out, outl); 292} 293 294int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 295 const unsigned char *key, const unsigned char *iv) 296{ 297 return EVP_CipherInit(ctx, cipher, key, iv, 1); 298} 299 300int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 301 ENGINE *impl, const unsigned char *key, 302 const unsigned char *iv) 303{ 304 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); 305} 306 307int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 308 const unsigned char *key, const unsigned char *iv) 309{ 310 return EVP_CipherInit(ctx, cipher, key, iv, 0); 311} 312 313int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 314 ENGINE *impl, const unsigned char *key, 315 const unsigned char *iv) 316{ 317 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); 318} 319 320int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 321 const unsigned char *in, int inl) 322{ 323 int i, j, bl; 324 325 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 326 i = M_do_cipher(ctx, out, in, inl); 327 if (i < 0) 328 return 0; 329 else 330 *outl = i; 331 return 1; 332 } 333 334 if (inl <= 0) { 335 *outl = 0; 336 return inl == 0; 337 } 338 339 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { 340 if (M_do_cipher(ctx, out, in, inl)) { 341 *outl = inl; 342 return 1; 343 } else { 344 *outl = 0; 345 return 0; 346 } 347 } 348 i = ctx->buf_len; 349 bl = ctx->cipher->block_size; 350 OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); 351 if (i != 0) { 352 if (bl - i > inl) { 353 memcpy(&(ctx->buf[i]), in, inl); 354 ctx->buf_len += inl; 355 *outl = 0; 356 return 1; 357 } else { 358 j = bl - i; 359 memcpy(&(ctx->buf[i]), in, j); 360 if (!M_do_cipher(ctx, out, ctx->buf, bl)) 361 return 0; 362 inl -= j; 363 in += j; 364 out += bl; 365 *outl = bl; 366 } 367 } else 368 *outl = 0; 369 i = inl & (bl - 1); 370 inl -= i; 371 if (inl > 0) { 372 if (!M_do_cipher(ctx, out, in, inl)) 373 return 0; 374 *outl += inl; 375 } 376 377 if (i != 0) 378 memcpy(ctx->buf, &(in[inl]), i); 379 ctx->buf_len = i; 380 return 1; 381} 382 383int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 384{ 385 int ret; 386 ret = EVP_EncryptFinal_ex(ctx, out, outl); 387 return ret; 388} 389 390int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 391{ 392 int n, ret; 393 unsigned int i, b, bl; 394 395 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 396 ret = M_do_cipher(ctx, out, NULL, 0); 397 if (ret < 0) 398 return 0; 399 else 400 *outl = ret; 401 return 1; 402 } 403 404 b = ctx->cipher->block_size; 405 OPENSSL_assert(b <= sizeof(ctx->buf)); 406 if (b == 1) { 407 *outl = 0; 408 return 1; 409 } 410 bl = ctx->buf_len; 411 if (ctx->flags & EVP_CIPH_NO_PADDING) { 412 if (bl) { 413 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, 414 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 415 return 0; 416 } 417 *outl = 0; 418 return 1; 419 } 420 421 n = b - bl; 422 for (i = bl; i < b; i++) 423 ctx->buf[i] = n; 424 ret = M_do_cipher(ctx, out, ctx->buf, b); 425 426 if (ret) 427 *outl = b; 428 429 return ret; 430} 431 432int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 433 const unsigned char *in, int inl) 434{ 435 int fix_len; 436 unsigned int b; 437 438 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 439 fix_len = M_do_cipher(ctx, out, in, inl); 440 if (fix_len < 0) { 441 *outl = 0; 442 return 0; 443 } else 444 *outl = fix_len; 445 return 1; 446 } 447 448 if (inl <= 0) { 449 *outl = 0; 450 return inl == 0; 451 } 452 453 if (ctx->flags & EVP_CIPH_NO_PADDING) 454 return EVP_EncryptUpdate(ctx, out, outl, in, inl); 455 456 b = ctx->cipher->block_size; 457 OPENSSL_assert(b <= sizeof(ctx->final)); 458 459 if (ctx->final_used) { 460 memcpy(out, ctx->final, b); 461 out += b; 462 fix_len = 1; 463 } else 464 fix_len = 0; 465 466 if (!EVP_EncryptUpdate(ctx, out, outl, in, inl)) 467 return 0; 468 469 /* 470 * if we have 'decrypted' a multiple of block size, make sure we have a 471 * copy of this last block 472 */ 473 if (b > 1 && !ctx->buf_len) { 474 *outl -= b; 475 ctx->final_used = 1; 476 memcpy(ctx->final, &out[*outl], b); 477 } else 478 ctx->final_used = 0; 479 480 if (fix_len) 481 *outl += b; 482 483 return 1; 484} 485 486int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 487{ 488 int ret; 489 ret = EVP_DecryptFinal_ex(ctx, out, outl); 490 return ret; 491} 492 493int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 494{ 495 int i, n; 496 unsigned int b; 497 *outl = 0; 498 499 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 500 i = M_do_cipher(ctx, out, NULL, 0); 501 if (i < 0) 502 return 0; 503 else 504 *outl = i; 505 return 1; 506 } 507 508 b = ctx->cipher->block_size; 509 if (ctx->flags & EVP_CIPH_NO_PADDING) { 510 if (ctx->buf_len) { 511 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, 512 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 513 return 0; 514 } 515 *outl = 0; 516 return 1; 517 } 518 if (b > 1) { 519 if (ctx->buf_len || !ctx->final_used) { 520 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); 521 return (0); 522 } 523 OPENSSL_assert(b <= sizeof(ctx->final)); 524 525 /* 526 * The following assumes that the ciphertext has been authenticated. 527 * Otherwise it provides a padding oracle. 528 */ 529 n = ctx->final[b - 1]; 530 if (n == 0 || n > (int)b) { 531 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); 532 return (0); 533 } 534 for (i = 0; i < n; i++) { 535 if (ctx->final[--b] != n) { 536 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); 537 return (0); 538 } 539 } 540 n = ctx->cipher->block_size - n; 541 for (i = 0; i < n; i++) 542 out[i] = ctx->final[i]; 543 *outl = n; 544 } else 545 *outl = 0; 546 return (1); 547} 548 549void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) 550{ 551 if (ctx) { 552 EVP_CIPHER_CTX_cleanup(ctx); 553 OPENSSL_free(ctx); 554 } 555} 556 557int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) 558{ 559#ifndef OPENSSL_FIPS 560 if (c->cipher != NULL) { 561 if (c->cipher->cleanup && !c->cipher->cleanup(c)) 562 return 0; 563 /* Cleanse cipher context data */ 564 if (c->cipher_data) 565 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); 566 } 567 if (c->cipher_data) 568 OPENSSL_free(c->cipher_data); 569#endif 570#ifndef OPENSSL_NO_ENGINE 571 if (c->engine) 572 /* 573 * The EVP_CIPHER we used belongs to an ENGINE, release the 574 * functional reference we held for this reason. 575 */ 576 ENGINE_finish(c->engine); 577#endif 578#ifdef OPENSSL_FIPS 579 FIPS_cipher_ctx_cleanup(c); 580#endif 581 memset(c, 0, sizeof(EVP_CIPHER_CTX)); 582 return 1; 583} 584 585int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) 586{ 587 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) 588 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); 589 if (c->key_len == keylen) 590 return 1; 591 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { 592 c->key_len = keylen; 593 return 1; 594 } 595 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); 596 return 0; 597} 598 599int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) 600{ 601 if (pad) 602 ctx->flags &= ~EVP_CIPH_NO_PADDING; 603 else 604 ctx->flags |= EVP_CIPH_NO_PADDING; 605 return 1; 606} 607 608int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 609{ 610 int ret; 611 if (!ctx->cipher) { 612 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); 613 return 0; 614 } 615 616 if (!ctx->cipher->ctrl) { 617 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); 618 return 0; 619 } 620 621 ret = ctx->cipher->ctrl(ctx, type, arg, ptr); 622 if (ret == -1) { 623 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, 624 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); 625 return 0; 626 } 627 return ret; 628} 629 630int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) 631{ 632 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) 633 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); 634 if (RAND_bytes(key, ctx->key_len) <= 0) 635 return 0; 636 return 1; 637} 638 639int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) 640{ 641 if ((in == NULL) || (in->cipher == NULL)) { 642 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); 643 return 0; 644 } 645#ifndef OPENSSL_NO_ENGINE 646 /* Make sure it's safe to copy a cipher context using an ENGINE */ 647 if (in->engine && !ENGINE_init(in->engine)) { 648 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); 649 return 0; 650 } 651#endif 652 653 EVP_CIPHER_CTX_cleanup(out); 654 memcpy(out, in, sizeof(*out)); 655 656 if (in->cipher_data && in->cipher->ctx_size) { 657 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); 658 if (!out->cipher_data) { 659 out->cipher = NULL; 660 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); 661 return 0; 662 } 663 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); 664 } 665 666 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) 667 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) { 668 out->cipher = NULL; 669 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR); 670 return 0; 671 } 672 return 1; 673} 674