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 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 298 const unsigned char *in, int inl) 299 { 300 int i, j, bl, cmpl = inl; 301 302 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) 303 cmpl = (cmpl + 7) / 8; 304 305 bl = ctx->cipher->block_size; 306 307 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 308 /* If block size > 1 then the cipher will have to do this check */ 309 if (bl == 1 && is_partially_overlapping(out, in, cmpl)) { 310 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); 311 return 0; 312 } 313 314 i = ctx->cipher->do_cipher(ctx, out, in, inl); 315 if (i < 0) 316 return 0; 317 else 318 *outl = i; 319 return 1; 320 } 321 322 if (inl <= 0) { 323 *outl = 0; 324 return inl == 0; 325 } 326 if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) { 327 EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); 328 return 0; 329 } 330 331 if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { 332 if (ctx->cipher->do_cipher(ctx, out, in, inl)) { 333 *outl = inl; 334 return 1; 335 } else { 336 *outl = 0; 337 return 0; 338 } 339 } 340 i = ctx->buf_len; 341 OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); 342 if (i != 0) { 343 if (bl - i > inl) { 344 memcpy(&(ctx->buf[i]), in, inl); 345 ctx->buf_len += inl; 346 *outl = 0; 347 return 1; 348 } else { 349 j = bl - i; 350 memcpy(&(ctx->buf[i]), in, j); 351 inl -= j; 352 in += j; 353 if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) 354 return 0; 355 out += bl; 356 *outl = bl; 357 } 358 } else 359 *outl = 0; 360 i = inl & (bl - 1); 361 inl -= i; 362 if (inl > 0) { 363 if (!ctx->cipher->do_cipher(ctx, out, in, inl)) 364 return 0; 365 *outl += inl; 366 } 367 368 if (i != 0) 369 memcpy(ctx->buf, &(in[inl]), i); 370 ctx->buf_len = i; 371 return 1; 372 } 373 374 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 375 { 376 int ret; 377 ret = EVP_EncryptFinal_ex(ctx, out, outl); 378 return ret; 379 } 380 381 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 382 { 383 int n, ret; 384 unsigned int i, b, bl; 385 386 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 387 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); 388 if (ret < 0) 389 return 0; 390 else 391 *outl = ret; 392 return 1; 393 } 394 395 b = ctx->cipher->block_size; 396 OPENSSL_assert(b <= sizeof(ctx->buf)); 397 if (b == 1) { 398 *outl = 0; 399 return 1; 400 } 401 bl = ctx->buf_len; 402 if (ctx->flags & EVP_CIPH_NO_PADDING) { 403 if (bl) { 404 EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, 405 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 406 return 0; 407 } 408 *outl = 0; 409 return 1; 410 } 411 412 n = b - bl; 413 for (i = bl; i < b; i++) 414 ctx->buf[i] = n; 415 ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); 416 417 if (ret) 418 *outl = b; 419 420 return ret; 421 } 422 423 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 424 const unsigned char *in, int inl) 425 { 426 int fix_len, cmpl = inl; 427 unsigned int b; 428 429 b = ctx->cipher->block_size; 430 431 if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) 432 cmpl = (cmpl + 7) / 8; 433 434 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 435 if (b == 1 && is_partially_overlapping(out, in, cmpl)) { 436 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); 437 return 0; 438 } 439 440 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); 441 if (fix_len < 0) { 442 *outl = 0; 443 return 0; 444 } else 445 *outl = fix_len; 446 return 1; 447 } 448 449 if (inl <= 0) { 450 *outl = 0; 451 return inl == 0; 452 } 453 454 if (ctx->flags & EVP_CIPH_NO_PADDING) 455 return EVP_EncryptUpdate(ctx, out, outl, in, inl); 456 457 OPENSSL_assert(b <= sizeof(ctx->final)); 458 459 if (ctx->final_used) { 460 /* see comment about PTRDIFF_T comparison above */ 461 if (((PTRDIFF_T)out == (PTRDIFF_T)in) 462 || is_partially_overlapping(out, in, b)) { 463 EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); 464 return 0; 465 } 466 memcpy(out, ctx->final, b); 467 out += b; 468 fix_len = 1; 469 } else 470 fix_len = 0; 471 472 if (!EVP_EncryptUpdate(ctx, out, outl, in, inl)) 473 return 0; 474 475 /* 476 * if we have 'decrypted' a multiple of block size, make sure we have a 477 * copy of this last block 478 */ 479 if (b > 1 && !ctx->buf_len) { 480 *outl -= b; 481 ctx->final_used = 1; 482 memcpy(ctx->final, &out[*outl], b); 483 } else 484 ctx->final_used = 0; 485 486 if (fix_len) 487 *outl += b; 488 489 return 1; 490 } 491 492 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 493 { 494 int ret; 495 ret = EVP_DecryptFinal_ex(ctx, out, outl); 496 return ret; 497 } 498 499 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 500 { 501 int i, n; 502 unsigned int b; 503 *outl = 0; 504 505 if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { 506 i = ctx->cipher->do_cipher(ctx, out, NULL, 0); 507 if (i < 0) 508 return 0; 509 else 510 *outl = i; 511 return 1; 512 } 513 514 b = ctx->cipher->block_size; 515 if (ctx->flags & EVP_CIPH_NO_PADDING) { 516 if (ctx->buf_len) { 517 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, 518 EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 519 return 0; 520 } 521 *outl = 0; 522 return 1; 523 } 524 if (b > 1) { 525 if (ctx->buf_len || !ctx->final_used) { 526 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); 527 return 0; 528 } 529 OPENSSL_assert(b <= sizeof(ctx->final)); 530 531 /* 532 * The following assumes that the ciphertext has been authenticated. 533 * Otherwise it provides a padding oracle. 534 */ 535 n = ctx->final[b - 1]; 536 if (n == 0 || n > (int)b) { 537 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); 538 return 0; 539 } 540 for (i = 0; i < n; i++) { 541 if (ctx->final[--b] != n) { 542 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); 543 return 0; 544 } 545 } 546 n = ctx->cipher->block_size - n; 547 for (i = 0; i < n; i++) 548 out[i] = ctx->final[i]; 549 *outl = n; 550 } else 551 *outl = 0; 552 return 1; 553 } 554 555 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) 556 { 557 if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) 558 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); 559 if (c->key_len == keylen) 560 return 1; 561 if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { 562 c->key_len = keylen; 563 return 1; 564 } 565 EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); 566 return 0; 567 } 568 569 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) 570 { 571 if (pad) 572 ctx->flags &= ~EVP_CIPH_NO_PADDING; 573 else 574 ctx->flags |= EVP_CIPH_NO_PADDING; 575 return 1; 576 } 577 578 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 579 { 580 int ret; 581 582 if (!ctx->cipher) { 583 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); 584 return 0; 585 } 586 587 if (!ctx->cipher->ctrl) { 588 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); 589 return 0; 590 } 591 592 ret = ctx->cipher->ctrl(ctx, type, arg, ptr); 593 if (ret == -1) { 594 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, 595 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); 596 return 0; 597 } 598 return ret; 599 } 600 601 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) 602 { 603 if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) 604 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); 605 if (RAND_priv_bytes(key, ctx->key_len) <= 0) 606 return 0; 607 return 1; 608 } 609 610 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) 611 { 612 if ((in == NULL) || (in->cipher == NULL)) { 613 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); 614 return 0; 615 } 616 #ifndef OPENSSL_NO_ENGINE 617 /* Make sure it's safe to copy a cipher context using an ENGINE */ 618 if (in->engine && !ENGINE_init(in->engine)) { 619 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); 620 return 0; 621 } 622 #endif 623 624 EVP_CIPHER_CTX_reset(out); 625 memcpy(out, in, sizeof(*out)); 626 627 if (in->cipher_data && in->cipher->ctx_size) { 628 out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); 629 if (out->cipher_data == NULL) { 630 out->cipher = NULL; 631 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); 632 return 0; 633 } 634 memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); 635 } 636 637 if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) 638 if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) { 639 out->cipher = NULL; 640 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR); 641 return 0; 642 } 643 return 1; 644 } 645