evp_enc.c revision 306195
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 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); 186 return 0; 187 } 188 } else { 189 ctx->cipher_data = NULL; 190 } 191 ctx->key_len = cipher->key_len; 192 /* Preserve wrap enable flag, zero everything else */ 193 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; 194 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { 195 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { 196 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 197 return 0; 198 } 199 } 200 } else if (!ctx->cipher) { 201 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); 202 return 0; 203 } 204#ifndef OPENSSL_NO_ENGINE 205 skip_to_init: 206#endif 207#ifdef OPENSSL_FIPS 208 if (FIPS_mode()) 209 return FIPS_cipherinit(ctx, cipher, key, iv, enc); 210#endif 211 /* we assume block size is a power of 2 in *cryptUpdate */ 212 OPENSSL_assert(ctx->cipher->block_size == 1 213 || ctx->cipher->block_size == 8 214 || ctx->cipher->block_size == 16); 215 216 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) 217 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { 218 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); 219 return 0; 220 } 221 222 if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { 223 switch (EVP_CIPHER_CTX_mode(ctx)) { 224 225 case EVP_CIPH_STREAM_CIPHER: 226 case EVP_CIPH_ECB_MODE: 227 break; 228 229 case EVP_CIPH_CFB_MODE: 230 case EVP_CIPH_OFB_MODE: 231 232 ctx->num = 0; 233 /* fall-through */ 234 235 case EVP_CIPH_CBC_MODE: 236 237 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= 238 (int)sizeof(ctx->iv)); 239 if (iv) 240 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 241 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); 242 break; 243 244 case EVP_CIPH_CTR_MODE: 245 ctx->num = 0; 246 /* Don't reuse IV for CTR mode */ 247 if (iv) 248 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 249 break; 250 251 default: 252 return 0; 253 break; 254 } 255 } 256 257 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { 258 if (!ctx->cipher->init(ctx, key, iv, enc)) 259 return 0; 260 } 261 ctx->buf_len = 0; 262 ctx->final_used = 0; 263 ctx->block_mask = ctx->cipher->block_size - 1; 264 return 1; 265} 266 267int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 268 const unsigned char *in, int inl) 269{ 270 if (ctx->encrypt) 271 return EVP_EncryptUpdate(ctx, out, outl, in, inl); 272 else 273 return EVP_DecryptUpdate(ctx, out, outl, in, inl); 274} 275 276int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 277{ 278 if (ctx->encrypt) 279 return EVP_EncryptFinal_ex(ctx, out, outl); 280 else 281 return EVP_DecryptFinal_ex(ctx, out, outl); 282} 283 284int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 285{ 286 if (ctx->encrypt) 287 return EVP_EncryptFinal(ctx, out, outl); 288 else 289 return EVP_DecryptFinal(ctx, out, outl); 290} 291 292int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 293 const unsigned char *key, const unsigned char *iv) 294{ 295 return EVP_CipherInit(ctx, cipher, key, iv, 1); 296} 297 298int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 299 ENGINE *impl, const unsigned char *key, 300 const unsigned char *iv) 301{ 302 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); 303} 304 305int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 306 const unsigned char *key, const unsigned char *iv) 307{ 308 return EVP_CipherInit(ctx, cipher, key, iv, 0); 309} 310 311int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 312 ENGINE *impl, const unsigned char *key, 313 const unsigned char *iv) 314{ 315 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); 316} 317 318int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 319 const unsigned char *in, int inl) 320{ 321 int i, j, bl; 322 323 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 324 i = M_do_cipher(ctx, out, in, inl); 325 if (i < 0) 326 return 0; 327 else 328 *outl = i; 329 return 1; 330 } 331 332 if (inl <= 0) { 333 *outl = 0; 334 return inl == 0; 335 } 336 337 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { 338 if (M_do_cipher(ctx, out, in, inl)) { 339 *outl = inl; 340 return 1; 341 } else { 342 *outl = 0; 343 return 0; 344 } 345 } 346 i = ctx->buf_len; 347 bl = ctx->cipher->block_size; 348 OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); 349 if (i != 0) { 350 if (bl - i > inl) { 351 memcpy(&(ctx->buf[i]), in, inl); 352 ctx->buf_len += inl; 353 *outl = 0; 354 return 1; 355 } else { 356 j = bl - i; 357 memcpy(&(ctx->buf[i]), in, j); 358 if (!M_do_cipher(ctx, out, ctx->buf, bl)) 359 return 0; 360 inl -= j; 361 in += j; 362 out += bl; 363 *outl = bl; 364 } 365 } else 366 *outl = 0; 367 i = inl & (bl - 1); 368 inl -= i; 369 if (inl > 0) { 370 if (!M_do_cipher(ctx, out, in, inl)) 371 return 0; 372 *outl += inl; 373 } 374 375 if (i != 0) 376 memcpy(ctx->buf, &(in[inl]), i); 377 ctx->buf_len = i; 378 return 1; 379} 380 381int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 382{ 383 int ret; 384 ret = EVP_EncryptFinal_ex(ctx, out, outl); 385 return ret; 386} 387 388int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 389{ 390 int n, ret; 391 unsigned int i, b, bl; 392 393 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 394 ret = M_do_cipher(ctx, out, NULL, 0); 395 if (ret < 0) 396 return 0; 397 else 398 *outl = ret; 399 return 1; 400 } 401 402 b = ctx->cipher->block_size; 403 OPENSSL_assert(b <= sizeof ctx->buf); 404 if (b == 1) { 405 *outl = 0; 406 return 1; 407 } 408 bl = ctx->buf_len; 409 if (ctx->flags & EVP_CIPH_NO_PADDING) { 410 if (bl) { 411 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, 412 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 413 return 0; 414 } 415 *outl = 0; 416 return 1; 417 } 418 419 n = b - bl; 420 for (i = bl; i < b; i++) 421 ctx->buf[i] = n; 422 ret = M_do_cipher(ctx, out, ctx->buf, b); 423 424 if (ret) 425 *outl = b; 426 427 return ret; 428} 429 430int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 431 const unsigned char *in, int inl) 432{ 433 int fix_len; 434 unsigned int b; 435 436 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 437 fix_len = M_do_cipher(ctx, out, in, inl); 438 if (fix_len < 0) { 439 *outl = 0; 440 return 0; 441 } else 442 *outl = fix_len; 443 return 1; 444 } 445 446 if (inl <= 0) { 447 *outl = 0; 448 return inl == 0; 449 } 450 451 if (ctx->flags & EVP_CIPH_NO_PADDING) 452 return EVP_EncryptUpdate(ctx, out, outl, in, inl); 453 454 b = ctx->cipher->block_size; 455 OPENSSL_assert(b <= sizeof ctx->final); 456 457 if (ctx->final_used) { 458 memcpy(out, ctx->final, b); 459 out += b; 460 fix_len = 1; 461 } else 462 fix_len = 0; 463 464 if (!EVP_EncryptUpdate(ctx, out, outl, in, inl)) 465 return 0; 466 467 /* 468 * if we have 'decrypted' a multiple of block size, make sure we have a 469 * copy of this last block 470 */ 471 if (b > 1 && !ctx->buf_len) { 472 *outl -= b; 473 ctx->final_used = 1; 474 memcpy(ctx->final, &out[*outl], b); 475 } else 476 ctx->final_used = 0; 477 478 if (fix_len) 479 *outl += b; 480 481 return 1; 482} 483 484int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 485{ 486 int ret; 487 ret = EVP_DecryptFinal_ex(ctx, out, outl); 488 return ret; 489} 490 491int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 492{ 493 int i, n; 494 unsigned int b; 495 *outl = 0; 496 497 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 498 i = M_do_cipher(ctx, out, NULL, 0); 499 if (i < 0) 500 return 0; 501 else 502 *outl = i; 503 return 1; 504 } 505 506 b = ctx->cipher->block_size; 507 if (ctx->flags & EVP_CIPH_NO_PADDING) { 508 if (ctx->buf_len) { 509 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, 510 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 511 return 0; 512 } 513 *outl = 0; 514 return 1; 515 } 516 if (b > 1) { 517 if (ctx->buf_len || !ctx->final_used) { 518 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); 519 return (0); 520 } 521 OPENSSL_assert(b <= sizeof ctx->final); 522 523 /* 524 * The following assumes that the ciphertext has been authenticated. 525 * Otherwise it provides a padding oracle. 526 */ 527 n = ctx->final[b - 1]; 528 if (n == 0 || n > (int)b) { 529 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); 530 return (0); 531 } 532 for (i = 0; i < n; i++) { 533 if (ctx->final[--b] != n) { 534 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); 535 return (0); 536 } 537 } 538 n = ctx->cipher->block_size - n; 539 for (i = 0; i < n; i++) 540 out[i] = ctx->final[i]; 541 *outl = n; 542 } else 543 *outl = 0; 544 return (1); 545} 546 547void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) 548{ 549 if (ctx) { 550 EVP_CIPHER_CTX_cleanup(ctx); 551 OPENSSL_free(ctx); 552 } 553} 554 555int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) 556{ 557#ifndef OPENSSL_FIPS 558 if (c->cipher != NULL) { 559 if (c->cipher->cleanup && !c->cipher->cleanup(c)) 560 return 0; 561 /* Cleanse cipher context data */ 562 if (c->cipher_data) 563 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); 564 } 565 if (c->cipher_data) 566 OPENSSL_free(c->cipher_data); 567#endif 568#ifndef OPENSSL_NO_ENGINE 569 if (c->engine) 570 /* 571 * The EVP_CIPHER we used belongs to an ENGINE, release the 572 * functional reference we held for this reason. 573 */ 574 ENGINE_finish(c->engine); 575#endif 576#ifdef OPENSSL_FIPS 577 FIPS_cipher_ctx_cleanup(c); 578#endif 579 memset(c, 0, sizeof(EVP_CIPHER_CTX)); 580 return 1; 581} 582 583int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) 584{ 585 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) 586 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); 587 if (c->key_len == keylen) 588 return 1; 589 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { 590 c->key_len = keylen; 591 return 1; 592 } 593 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); 594 return 0; 595} 596 597int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) 598{ 599 if (pad) 600 ctx->flags &= ~EVP_CIPH_NO_PADDING; 601 else 602 ctx->flags |= EVP_CIPH_NO_PADDING; 603 return 1; 604} 605 606int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 607{ 608 int ret; 609 if (!ctx->cipher) { 610 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); 611 return 0; 612 } 613 614 if (!ctx->cipher->ctrl) { 615 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); 616 return 0; 617 } 618 619 ret = ctx->cipher->ctrl(ctx, type, arg, ptr); 620 if (ret == -1) { 621 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, 622 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); 623 return 0; 624 } 625 return ret; 626} 627 628int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) 629{ 630 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) 631 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); 632 if (RAND_bytes(key, ctx->key_len) <= 0) 633 return 0; 634 return 1; 635} 636 637int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) 638{ 639 if ((in == NULL) || (in->cipher == NULL)) { 640 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); 641 return 0; 642 } 643#ifndef OPENSSL_NO_ENGINE 644 /* Make sure it's safe to copy a cipher context using an ENGINE */ 645 if (in->engine && !ENGINE_init(in->engine)) { 646 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); 647 return 0; 648 } 649#endif 650 651 EVP_CIPHER_CTX_cleanup(out); 652 memcpy(out, in, sizeof *out); 653 654 if (in->cipher_data && in->cipher->ctx_size) { 655 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); 656 if (!out->cipher_data) { 657 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); 658 return 0; 659 } 660 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); 661 } 662 663 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) 664 return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out); 665 return 1; 666} 667