1 /* crypto/evp/evp_enc.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 "constant_time_locl.h" 71 #include "evp_locl.h" 72 73 #ifdef OPENSSL_FIPS 74 #define M_do_cipher(ctx, out, in, inl) FIPS_cipher(ctx, out, in, inl) 75 #else 76 #define M_do_cipher(ctx, out, in, inl) ctx->cipher->do_cipher(ctx, out, in, inl) 77 #endif 78 79 80 const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT; 81 82 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) 83 { 84 memset(ctx,0,sizeof(EVP_CIPHER_CTX)); 85 /* ctx->cipher=NULL; */ 86 } 87 88 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) 89 { 90 EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx); 91 if (ctx) 92 EVP_CIPHER_CTX_init(ctx); 93 return ctx; 94 } 95 96 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 97 const unsigned char *key, const unsigned char *iv, int enc) 98 { 99 if (cipher) 100 EVP_CIPHER_CTX_init(ctx); 101 return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc); 102 } 103 104 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, 105 const unsigned char *key, const unsigned char *iv, int enc) 106 { 107 if (enc == -1) 108 enc = ctx->encrypt; 109 else 110 { 111 if (enc) 112 enc = 1; 113 ctx->encrypt = enc; 114 } 115 #ifndef OPENSSL_NO_ENGINE 116 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts 117 * so this context may already have an ENGINE! Try to avoid releasing 118 * the previous handle, re-querying for an ENGINE, and having a 119 * reinitialisation, when it may all be unecessary. */ 120 if (ctx->engine && ctx->cipher && (!cipher || 121 (cipher && (cipher->nid == ctx->cipher->nid)))) 122 goto skip_to_init; 123 #endif 124 if (cipher) 125 { 126 /* Ensure a context left lying around from last time is cleared 127 * (the previous check attempted to avoid this if the same 128 * ENGINE and EVP_CIPHER could be used). */ 129 if (ctx->cipher) 130 { 131 unsigned long flags = ctx->flags; 132 EVP_CIPHER_CTX_cleanup(ctx); 133 /* Restore encrypt and flags */ 134 ctx->encrypt = enc; 135 ctx->flags = flags; 136 } 137 #ifndef OPENSSL_NO_ENGINE 138 if(impl) 139 { 140 if (!ENGINE_init(impl)) 141 { 142 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 143 return 0; 144 } 145 } 146 else 147 /* Ask if an ENGINE is reserved for this job */ 148 impl = ENGINE_get_cipher_engine(cipher->nid); 149 if(impl) 150 { 151 /* There's an ENGINE for this job ... (apparently) */ 152 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); 153 if(!c) 154 { 155 /* One positive side-effect of US's export 156 * control history, is that we should at least 157 * be able to avoid using US mispellings of 158 * "initialisation"? */ 159 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 160 return 0; 161 } 162 /* We'll use the ENGINE's private cipher definition */ 163 cipher = c; 164 /* Store the ENGINE functional reference so we know 165 * 'cipher' came from an ENGINE and we need to release 166 * it when done. */ 167 ctx->engine = impl; 168 } 169 else 170 ctx->engine = NULL; 171 #endif 172 173 #ifdef OPENSSL_FIPS 174 if (FIPS_mode()) 175 return FIPS_cipherinit(ctx, cipher, key, iv, enc); 176 #endif 177 ctx->cipher=cipher; 178 if (ctx->cipher->ctx_size) 179 { 180 ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size); 181 if (!ctx->cipher_data) 182 { 183 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); 184 return 0; 185 } 186 } 187 else 188 { 189 ctx->cipher_data = NULL; 190 } 191 ctx->key_len = cipher->key_len; 192 ctx->flags = 0; 193 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) 194 { 195 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) 196 { 197 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 198 return 0; 199 } 200 } 201 } 202 else if(!ctx->cipher) 203 { 204 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); 205 return 0; 206 } 207 #ifndef OPENSSL_NO_ENGINE 208 skip_to_init: 209 #endif 210 #ifdef OPENSSL_FIPS 211 if (FIPS_mode()) 212 return FIPS_cipherinit(ctx, cipher, key, iv, enc); 213 #endif 214 /* we assume block size is a power of 2 in *cryptUpdate */ 215 OPENSSL_assert(ctx->cipher->block_size == 1 216 || ctx->cipher->block_size == 8 217 || ctx->cipher->block_size == 16); 218 219 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { 220 switch(EVP_CIPHER_CTX_mode(ctx)) { 221 222 case EVP_CIPH_STREAM_CIPHER: 223 case EVP_CIPH_ECB_MODE: 224 break; 225 226 case EVP_CIPH_CFB_MODE: 227 case EVP_CIPH_OFB_MODE: 228 229 ctx->num = 0; 230 /* fall-through */ 231 232 case EVP_CIPH_CBC_MODE: 233 234 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= 235 (int)sizeof(ctx->iv)); 236 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 237 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); 238 break; 239 240 case EVP_CIPH_CTR_MODE: 241 ctx->num = 0; 242 /* Don't reuse IV for CTR mode */ 243 if(iv) 244 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 245 break; 246 247 default: 248 return 0; 249 break; 250 } 251 } 252 253 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { 254 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0; 255 } 256 ctx->buf_len=0; 257 ctx->final_used=0; 258 ctx->block_mask=ctx->cipher->block_size-1; 259 return 1; 260 } 261 262 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 263 const unsigned char *in, int inl) 264 { 265 if (ctx->encrypt) 266 return EVP_EncryptUpdate(ctx,out,outl,in,inl); 267 else return EVP_DecryptUpdate(ctx,out,outl,in,inl); 268 } 269 270 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 271 { 272 if (ctx->encrypt) 273 return EVP_EncryptFinal_ex(ctx,out,outl); 274 else return EVP_DecryptFinal_ex(ctx,out,outl); 275 } 276 277 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 278 { 279 if (ctx->encrypt) 280 return EVP_EncryptFinal(ctx,out,outl); 281 else return EVP_DecryptFinal(ctx,out,outl); 282 } 283 284 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 285 const unsigned char *key, const unsigned char *iv) 286 { 287 return EVP_CipherInit(ctx, cipher, key, iv, 1); 288 } 289 290 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl, 291 const unsigned char *key, const unsigned char *iv) 292 { 293 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); 294 } 295 296 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 297 const unsigned char *key, const unsigned char *iv) 298 { 299 return EVP_CipherInit(ctx, cipher, key, iv, 0); 300 } 301 302 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, 303 const unsigned char *key, const unsigned char *iv) 304 { 305 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); 306 } 307 308 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 309 const unsigned char *in, int inl) 310 { 311 int i,j,bl; 312 313 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) 314 { 315 i = M_do_cipher(ctx, out, in, inl); 316 if (i < 0) 317 return 0; 318 else 319 *outl = i; 320 return 1; 321 } 322 323 if (inl <= 0) 324 { 325 *outl = 0; 326 return inl == 0; 327 } 328 329 if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0) 330 { 331 if(M_do_cipher(ctx,out,in,inl)) 332 { 333 *outl=inl; 334 return 1; 335 } 336 else 337 { 338 *outl=0; 339 return 0; 340 } 341 } 342 i=ctx->buf_len; 343 bl=ctx->cipher->block_size; 344 OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); 345 if (i != 0) 346 { 347 if (i+inl < bl) 348 { 349 memcpy(&(ctx->buf[i]),in,inl); 350 ctx->buf_len+=inl; 351 *outl=0; 352 return 1; 353 } 354 else 355 { 356 j=bl-i; 357 memcpy(&(ctx->buf[i]),in,j); 358 if(!M_do_cipher(ctx,out,ctx->buf,bl)) return 0; 359 inl-=j; 360 in+=j; 361 out+=bl; 362 *outl=bl; 363 } 364 } 365 else 366 *outl = 0; 367 i=inl&(bl-1); 368 inl-=i; 369 if (inl > 0) 370 { 371 if(!M_do_cipher(ctx,out,in,inl)) 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 } 380 381 int 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 } 387 388 int 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 { 395 ret = M_do_cipher(ctx, out, NULL, 0); 396 if (ret < 0) 397 return 0; 398 else 399 *outl = ret; 400 return 1; 401 } 402 403 b=ctx->cipher->block_size; 404 OPENSSL_assert(b <= sizeof ctx->buf); 405 if (b == 1) 406 { 407 *outl=0; 408 return 1; 409 } 410 bl=ctx->buf_len; 411 if (ctx->flags & EVP_CIPH_NO_PADDING) 412 { 413 if(bl) 414 { 415 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 416 return 0; 417 } 418 *outl = 0; 419 return 1; 420 } 421 422 n=b-bl; 423 for (i=bl; i<b; i++) 424 ctx->buf[i]=n; 425 ret=M_do_cipher(ctx,out,ctx->buf,b); 426 427 428 if(ret) 429 *outl=b; 430 431 return ret; 432 } 433 434 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 435 const unsigned char *in, int inl) 436 { 437 int fix_len; 438 unsigned int b; 439 440 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) 441 { 442 fix_len = M_do_cipher(ctx, out, in, inl); 443 if (fix_len < 0) 444 { 445 *outl = 0; 446 return 0; 447 } 448 else 449 *outl = fix_len; 450 return 1; 451 } 452 453 if (inl <= 0) 454 { 455 *outl = 0; 456 return inl == 0; 457 } 458 459 if (ctx->flags & EVP_CIPH_NO_PADDING) 460 return EVP_EncryptUpdate(ctx, out, outl, in, inl); 461 462 b=ctx->cipher->block_size; 463 OPENSSL_assert(b <= sizeof ctx->final); 464 465 if(ctx->final_used) 466 { 467 memcpy(out,ctx->final,b); 468 out+=b; 469 fix_len = 1; 470 } 471 else 472 fix_len = 0; 473 474 475 if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) 476 return 0; 477 478 /* if we have 'decrypted' a multiple of block size, make sure 479 * we have a copy of this last block */ 480 if (b > 1 && !ctx->buf_len) 481 { 482 *outl-=b; 483 ctx->final_used=1; 484 memcpy(ctx->final,&out[*outl],b); 485 } 486 else 487 ctx->final_used = 0; 488 489 if (fix_len) 490 *outl += b; 491 492 return 1; 493 } 494 495 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 496 { 497 int ret; 498 ret = EVP_DecryptFinal_ex(ctx, out, outl); 499 return ret; 500 } 501 502 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 503 { 504 unsigned int i, b; 505 unsigned char pad, padding_good; 506 *outl=0; 507 508 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) 509 { 510 int ret = M_do_cipher(ctx, out, NULL, 0); 511 if (ret < 0) 512 return 0; 513 else 514 *outl = ret; 515 return 1; 516 } 517 518 b=(unsigned int)(ctx->cipher->block_size); 519 if (ctx->flags & EVP_CIPH_NO_PADDING) 520 { 521 if(ctx->buf_len) 522 { 523 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 524 return 0; 525 } 526 *outl = 0; 527 return 1; 528 } 529 if (b > 1) 530 { 531 if (ctx->buf_len || !ctx->final_used) 532 { 533 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH); 534 return(0); 535 } 536 OPENSSL_assert(b <= sizeof ctx->final); 537 pad=ctx->final[b-1]; 538 539 padding_good = (unsigned char)(~constant_time_is_zero_8(pad)); 540 padding_good &= constant_time_ge_8(b, pad); 541 542 for (i = 1; i < b; ++i) 543 { 544 unsigned char is_pad_index = constant_time_lt_8(i, pad); 545 unsigned char pad_byte_good = constant_time_eq_8(ctx->final[b-i-1], pad); 546 padding_good &= constant_time_select_8(is_pad_index, pad_byte_good, 0xff); 547 } 548 549 /* 550 * At least 1 byte is always padding, so we always write b - 1 551 * bytes to avoid a timing leak. The caller is required to have |b| 552 * bytes space in |out| by the API contract. 553 */ 554 for (i = 0; i < b - 1; ++i) 555 out[i] = ctx->final[i] & padding_good; 556 /* Safe cast: for a good padding, EVP_MAX_IV_LENGTH >= b >= pad */ 557 *outl = padding_good & ((unsigned char)(b - pad)); 558 return padding_good & 1; 559 } 560 else 561 { 562 *outl = 0; 563 return 1; 564 } 565 } 566 567 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) 568 { 569 if (ctx) 570 { 571 EVP_CIPHER_CTX_cleanup(ctx); 572 OPENSSL_free(ctx); 573 } 574 } 575 576 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) 577 { 578 #ifndef OPENSSL_FIPS 579 if (c->cipher != NULL) 580 { 581 if(c->cipher->cleanup && !c->cipher->cleanup(c)) 582 return 0; 583 /* Cleanse cipher context data */ 584 if (c->cipher_data) 585 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); 586 } 587 if (c->cipher_data) 588 OPENSSL_free(c->cipher_data); 589 #endif 590 #ifndef OPENSSL_NO_ENGINE 591 if (c->engine) 592 /* The EVP_CIPHER we used belongs to an ENGINE, release the 593 * functional reference we held for this reason. */ 594 ENGINE_finish(c->engine); 595 #endif 596 #ifdef OPENSSL_FIPS 597 FIPS_cipher_ctx_cleanup(c); 598 #endif 599 memset(c,0,sizeof(EVP_CIPHER_CTX)); 600 return 1; 601 } 602 603 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) 604 { 605 if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) 606 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); 607 if(c->key_len == keylen) return 1; 608 if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) 609 { 610 c->key_len = keylen; 611 return 1; 612 } 613 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH); 614 return 0; 615 } 616 617 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) 618 { 619 if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING; 620 else ctx->flags |= EVP_CIPH_NO_PADDING; 621 return 1; 622 } 623 624 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 625 { 626 int ret; 627 if(!ctx->cipher) { 628 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); 629 return 0; 630 } 631 632 if(!ctx->cipher->ctrl) { 633 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); 634 return 0; 635 } 636 637 ret = ctx->cipher->ctrl(ctx, type, arg, ptr); 638 if(ret == -1) { 639 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); 640 return 0; 641 } 642 return ret; 643 } 644 645 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) 646 { 647 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) 648 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); 649 if (RAND_bytes(key, ctx->key_len) <= 0) 650 return 0; 651 return 1; 652 } 653 654 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) 655 { 656 if ((in == NULL) || (in->cipher == NULL)) 657 { 658 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED); 659 return 0; 660 } 661 #ifndef OPENSSL_NO_ENGINE 662 /* Make sure it's safe to copy a cipher context using an ENGINE */ 663 if (in->engine && !ENGINE_init(in->engine)) 664 { 665 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_ENGINE_LIB); 666 return 0; 667 } 668 #endif 669 670 EVP_CIPHER_CTX_cleanup(out); 671 memcpy(out,in,sizeof *out); 672 673 if (in->cipher_data && in->cipher->ctx_size) 674 { 675 out->cipher_data=OPENSSL_malloc(in->cipher->ctx_size); 676 if (!out->cipher_data) 677 { 678 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_MALLOC_FAILURE); 679 return 0; 680 } 681 memcpy(out->cipher_data,in->cipher_data,in->cipher->ctx_size); 682 } 683 684 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) 685 return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out); 686 return 1; 687 } 688
