1 /* 2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (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 #include <stdio.h> 11 #include <assert.h> 12 #include "internal/cryptlib.h" 13 #include <openssl/evp.h> 14 #include <openssl/err.h> 15 #include <openssl/rand.h> 16 #include <openssl/rand_drbg.h> 17 #include <openssl/engine.h> 18 #include "internal/evp_int.h" 19 #include "evp_locl.h" 20 21 int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *c) 22 { 23 if (c == NULL) 24 return 1; 25 if (c->cipher != NULL) { 26 if (c->cipher->cleanup && !c->cipher->cleanup(c)) 27 return 0; 28 /* Cleanse cipher context data */ 29 if (c->cipher_data && c->cipher->ctx_size) 30 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); 31 } 32 OPENSSL_free(c->cipher_data); 33 #ifndef OPENSSL_NO_ENGINE 34 ENGINE_finish(c->engine); 35 #endif 36 memset(c, 0, sizeof(*c)); 37 return 1; 38 } 39 40 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) 41 { 42 return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX)); 43 } 44 45 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) 46 { 47 EVP_CIPHER_CTX_reset(ctx); 48 OPENSSL_free(ctx); 49 } 50 51 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 52 const unsigned char *key, const unsigned char *iv, int enc) 53 { 54 if (cipher != NULL) 55 EVP_CIPHER_CTX_reset(ctx); 56 return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); 57 } 58 59 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 60 ENGINE *impl, const unsigned char *key, 61 const unsigned char *iv, int enc) 62 { 63 if (enc == -1) 64 enc = ctx->encrypt; 65 else { 66 if (enc) 67 enc = 1; 68 ctx->encrypt = enc; 69 } 70 #ifndef OPENSSL_NO_ENGINE 71 /* 72 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so 73 * this context may already have an ENGINE! Try to avoid releasing the 74 * previous handle, re-querying for an ENGINE, and having a 75 * reinitialisation, when it may all be unnecessary. 76 */ 77 if (ctx->engine && ctx->cipher 78 && (cipher == NULL || cipher->nid == ctx->cipher->nid)) 79 goto skip_to_init; 80 #endif 81 if (cipher) { 82 /* 83 * Ensure a context left lying around from last time is cleared (the 84 * previous check attempted to avoid this if the same ENGINE and 85 * EVP_CIPHER could be used). 86 */ 87 if (ctx->cipher) { 88 unsigned long flags = ctx->flags; 89 EVP_CIPHER_CTX_reset(ctx); 90 /* Restore encrypt and flags */ 91 ctx->encrypt = enc; 92 ctx->flags = flags; 93 } 94 #ifndef OPENSSL_NO_ENGINE 95 if (impl) { 96 if (!ENGINE_init(impl)) { 97 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 98 return 0; 99 } 100 } else 101 /* Ask if an ENGINE is reserved for this job */ 102 impl = ENGINE_get_cipher_engine(cipher->nid); 103 if (impl) { 104 /* There's an ENGINE for this job ... (apparently) */ 105 const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); 106 if (!c) { 107 /* 108 * One positive side-effect of US's export control history, 109 * is that we should at least be able to avoid using US 110 * misspellings of "initialisation"? 111 */ 112 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 113 return 0; 114 } 115 /* We'll use the ENGINE's private cipher definition */ 116 cipher = c; 117 /* 118 * Store the ENGINE functional reference so we know 'cipher' came 119 * from an ENGINE and we need to release it when done. 120 */ 121 ctx->engine = impl; 122 } else 123 ctx->engine = NULL; 124 #endif 125 126 ctx->cipher = cipher; 127 if (ctx->cipher->ctx_size) { 128 ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size); 129 if (ctx->cipher_data == NULL) { 130 ctx->cipher = NULL; 131 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); 132 return 0; 133 } 134 } else { 135 ctx->cipher_data = NULL; 136 } 137 ctx->key_len = cipher->key_len; 138 /* Preserve wrap enable flag, zero everything else */ 139 ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; 140 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { 141 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { 142 ctx->cipher = NULL; 143 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 144 return 0; 145 } 146 } 147 } else if (!ctx->cipher) { 148 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); 149 return 0; 150 } 151 #ifndef OPENSSL_NO_ENGINE 152 skip_to_init: 153 #endif 154 /* we assume block size is a power of 2 in *cryptUpdate */ 155 OPENSSL_assert(ctx->cipher->block_size == 1 156 || ctx->cipher->block_size == 8 157 || ctx->cipher->block_size == 16); 158 159 if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) 160 && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { 161 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); 162 return 0; 163 } 164 165 if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { 166 switch (EVP_CIPHER_CTX_mode(ctx)) { 167 168 case EVP_CIPH_STREAM_CIPHER: 169 case EVP_CIPH_ECB_MODE: 170 break; 171 172 case EVP_CIPH_CFB_MODE: 173 case EVP_CIPH_OFB_MODE: 174 175 ctx->num = 0; 176 /* fall-through */ 177 178 case EVP_CIPH_CBC_MODE: 179 180 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= 181 (int)sizeof(ctx->iv)); 182 if (iv) 183 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 184 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); 185 break; 186 187 case EVP_CIPH_CTR_MODE: 188 ctx->num = 0; 189 /* Don't reuse IV for CTR mode */ 190 if (iv) 191 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 192 break; 193 194 default: 195 return 0; 196 } 197 } 198 199 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { 200 if (!ctx->cipher->init(ctx, key, iv, enc)) 201 return 0; 202 } 203 ctx->buf_len = 0; 204 ctx->final_used = 0; 205 ctx->block_mask = ctx->cipher->block_size - 1; 206 return 1; 207 } 208 209 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 210 const unsigned char *in, int inl) 211 { 212 if (ctx->encrypt) 213 return EVP_EncryptUpdate(ctx, out, outl, in, inl); 214 else 215 return EVP_DecryptUpdate(ctx, out, outl, in, inl); 216 } 217 218 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 219 { 220 if (ctx->encrypt) 221 return EVP_EncryptFinal_ex(ctx, out, outl); 222 else 223 return EVP_DecryptFinal_ex(ctx, out, outl); 224 } 225 226 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 227 { 228 if (ctx->encrypt) 229 return EVP_EncryptFinal(ctx, out, outl); 230 else 231 return EVP_DecryptFinal(ctx, out, outl); 232 } 233 234 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 235 const unsigned char *key, const unsigned char *iv) 236 { 237 return EVP_CipherInit(ctx, cipher, key, iv, 1); 238 } 239 240 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 241 ENGINE *impl, const unsigned char *key, 242 const unsigned char *iv) 243 { 244 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); 245 } 246 247 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 248 const unsigned char *key, const unsigned char *iv) 249 { 250 return EVP_CipherInit(ctx, cipher, key, iv, 0); 251 } 252 253 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 254 ENGINE *impl, const unsigned char *key, 255 const unsigned char *iv) 256 { 257 return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); 258 } 259 260 /* 261 * According to the letter of standard difference between pointers 262 * is specified to be valid only within same object. This makes 263 * it formally challenging to determine if input and output buffers 264 * are not partially overlapping with standard pointer arithmetic. 265 */ 266 #ifdef PTRDIFF_T 267 # undef PTRDIFF_T 268 #endif 269 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64 270 /* 271 * Then we have VMS that distinguishes itself by adhering to 272 * sizeof(size_t)==4 even in 64-bit builds, which means that 273 * difference between two pointers might be truncated to 32 bits. 274 * In the context one can even wonder how comparison for 275 * equality is implemented. To be on the safe side we adhere to 276 * PTRDIFF_T even for comparison for equality. 277 */ 278 # define PTRDIFF_T uint64_t 279 #else 280 # define PTRDIFF_T size_t 281 #endif 282 283 int is_partially_overlapping(const void *ptr1, const void *ptr2, int len) 284 { 285 PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2; 286 /* 287 * Check for partially overlapping buffers. [Binary logical 288 * operations are used instead of boolean to minimize number 289 * of conditional branches.] 290 */ 291 int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) | 292 (diff > (0 - (PTRDIFF_T)len))); 293 294 return overlapped; 295 } 296 297 static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx, 298 unsigned char *out, int *outl, 299 const unsigned char *in, int inl) 300 { 301 int i, j, bl, cmpl = inl; 302 303 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) 304 cmpl = (cmpl + 7) / 8; 305 306 bl = ctx->cipher->block_size; 307 308 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 309 /* If block size > 1 then the cipher will have to do this check */ 310 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) { 311 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); 312 return 0; 313 } 314 315 i = ctx->cipher->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 *outl = 0; 325 return inl == 0; 326 } 327 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) { 328 EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); 329 return 0; 330 } 331 332 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { 333 if (ctx->cipher->do_cipher(ctx, out, in, inl)) { 334 *outl = inl; 335 return 1; 336 } else { 337 *outl = 0; 338 return 0; 339 } 340 } 341 i = ctx->buf_len; 342 OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); 343 if (i != 0) { 344 if (bl - i > inl) { 345 memcpy(&(ctx->buf[i]), in, inl); 346 ctx->buf_len += inl; 347 *outl = 0; 348 return 1; 349 } else { 350 j = bl - i; 351 memcpy(&(ctx->buf[i]), in, j); 352 inl -= j; 353 in += j; 354 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) 355 return 0; 356 out += bl; 357 *outl = bl; 358 } 359 } else 360 *outl = 0; 361 i = inl & (bl - 1); 362 inl -= i; 363 if (inl > 0) { 364 if (!ctx->cipher->do_cipher(ctx, out, in, inl)) 365 return 0; 366 *outl += inl; 367 } 368 369 if (i != 0) 370 memcpy(ctx->buf, &(in[inl]), i); 371 ctx->buf_len = i; 372 return 1; 373 } 374 375 376 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 377 const unsigned char *in, int inl) 378 { 379 /* Prevent accidental use of decryption context when encrypting */ 380 if (!ctx->encrypt) { 381 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION); 382 return 0; 383 } 384 385 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl); 386 } 387 388 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 389 { 390 int ret; 391 ret = EVP_EncryptFinal_ex(ctx, out, outl); 392 return ret; 393 } 394 395 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 396 { 397 int n, ret; 398 unsigned int i, b, bl; 399 400 /* Prevent accidental use of decryption context when encrypting */ 401 if (!ctx->encrypt) { 402 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION); 403 return 0; 404 } 405 406 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 407 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); 408 if (ret < 0) 409 return 0; 410 else 411 *outl = ret; 412 return 1; 413 } 414 415 b = ctx->cipher->block_size; 416 OPENSSL_assert(b <= sizeof(ctx->buf)); 417 if (b == 1) { 418 *outl = 0; 419 return 1; 420 } 421 bl = ctx->buf_len; 422 if (ctx->flags & EVP_CIPH_NO_PADDING) { 423 if (bl) { 424 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, 425 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 426 return 0; 427 } 428 *outl = 0; 429 return 1; 430 } 431 432 n = b - bl; 433 for (i = bl; i < b; i++) 434 ctx->buf[i] = n; 435 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); 436 437 if (ret) 438 *outl = b; 439 440 return ret; 441 } 442 443 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 444 const unsigned char *in, int inl) 445 { 446 int fix_len, cmpl = inl; 447 unsigned int b; 448 449 /* Prevent accidental use of encryption context when decrypting */ 450 if (ctx->encrypt) { 451 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION); 452 return 0; 453 } 454 455 b = ctx->cipher->block_size; 456 457 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) 458 cmpl = (cmpl + 7) / 8; 459 460 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 461 if (b == 1 && is_partially_overlapping(out, in, cmpl)) { 462 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); 463 return 0; 464 } 465 466 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); 467 if (fix_len < 0) { 468 *outl = 0; 469 return 0; 470 } else 471 *outl = fix_len; 472 return 1; 473 } 474 475 if (inl <= 0) { 476 *outl = 0; 477 return inl == 0; 478 } 479 480 if (ctx->flags & EVP_CIPH_NO_PADDING) 481 return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl); 482 483 OPENSSL_assert(b <= sizeof(ctx->final)); 484 485 if (ctx->final_used) { 486 /* see comment about PTRDIFF_T comparison above */ 487 if (((PTRDIFF_T)out == (PTRDIFF_T)in) 488 || is_partially_overlapping(out, in, b)) { 489 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); 490 return 0; 491 } 492 memcpy(out, ctx->final, b); 493 out += b; 494 fix_len = 1; 495 } else 496 fix_len = 0; 497 498 if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl)) 499 return 0; 500 501 /* 502 * if we have 'decrypted' a multiple of block size, make sure we have a 503 * copy of this last block 504 */ 505 if (b > 1 && !ctx->buf_len) { 506 *outl -= b; 507 ctx->final_used = 1; 508 memcpy(ctx->final, &out[*outl], b); 509 } else 510 ctx->final_used = 0; 511 512 if (fix_len) 513 *outl += b; 514 515 return 1; 516 } 517 518 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 519 { 520 int ret; 521 ret = EVP_DecryptFinal_ex(ctx, out, outl); 522 return ret; 523 } 524 525 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 526 { 527 int i, n; 528 unsigned int b; 529 530 /* Prevent accidental use of encryption context when decrypting */ 531 if (ctx->encrypt) { 532 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION); 533 return 0; 534 } 535 536 *outl = 0; 537 538 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 539 i = ctx->cipher->do_cipher(ctx, out, NULL, 0); 540 if (i < 0) 541 return 0; 542 else 543 *outl = i; 544 return 1; 545 } 546 547 b = ctx->cipher->block_size; 548 if (ctx->flags & EVP_CIPH_NO_PADDING) { 549 if (ctx->buf_len) { 550 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, 551 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 552 return 0; 553 } 554 *outl = 0; 555 return 1; 556 } 557 if (b > 1) { 558 if (ctx->buf_len || !ctx->final_used) { 559 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); 560 return 0; 561 } 562 OPENSSL_assert(b <= sizeof(ctx->final)); 563 564 /* 565 * The following assumes that the ciphertext has been authenticated. 566 * Otherwise it provides a padding oracle. 567 */ 568 n = ctx->final[b - 1]; 569 if (n == 0 || n > (int)b) { 570 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); 571 return 0; 572 } 573 for (i = 0; i < n; i++) { 574 if (ctx->final[--b] != n) { 575 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); 576 return 0; 577 } 578 } 579 n = ctx->cipher->block_size - n; 580 for (i = 0; i < n; i++) 581 out[i] = ctx->final[i]; 582 *outl = n; 583 } else 584 *outl = 0; 585 return 1; 586 } 587 588 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) 589 { 590 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) 591 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); 592 if (c->key_len == keylen) 593 return 1; 594 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { 595 c->key_len = keylen; 596 return 1; 597 } 598 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); 599 return 0; 600 } 601 602 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) 603 { 604 if (pad) 605 ctx->flags &= ~EVP_CIPH_NO_PADDING; 606 else 607 ctx->flags |= EVP_CIPH_NO_PADDING; 608 return 1; 609 } 610 611 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 612 { 613 int ret; 614 615 if (!ctx->cipher) { 616 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); 617 return 0; 618 } 619 620 if (!ctx->cipher->ctrl) { 621 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); 622 return 0; 623 } 624 625 ret = ctx->cipher->ctrl(ctx, type, arg, ptr); 626 if (ret == -1) { 627 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, 628 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); 629 return 0; 630 } 631 return ret; 632 } 633 634 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) 635 { 636 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) 637 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); 638 if (RAND_priv_bytes(key, ctx->key_len) <= 0) 639 return 0; 640 return 1; 641 } 642 643 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) 644 { 645 if ((in == NULL) || (in->cipher == NULL)) { 646 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); 647 return 0; 648 } 649 #ifndef OPENSSL_NO_ENGINE 650 /* Make sure it's safe to copy a cipher context using an ENGINE */ 651 if (in->engine && !ENGINE_init(in->engine)) { 652 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); 653 return 0; 654 } 655 #endif 656 657 EVP_CIPHER_CTX_reset(out); 658 memcpy(out, in, sizeof(*out)); 659 660 if (in->cipher_data && in->cipher->ctx_size) { 661 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); 662 if (out->cipher_data == NULL) { 663 out->cipher = NULL; 664 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); 665 return 0; 666 } 667 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); 668 } 669 670 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) 671 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) { 672 out->cipher = NULL; 673 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR); 674 return 0; 675 } 676 return 1; 677 } 678