crypto/evp/evp_enc.c

   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 #include "evp_locl.h"
  68
  69 const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT;
  70
  71 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
  72         {
  73         memset(ctx,0,sizeof(EVP_CIPHER_CTX));
  74         /* ctx->cipher=NULL; */
  75         }
  76
  77 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
  78         {
  79         EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
  80         if (ctx)
  81                 EVP_CIPHER_CTX_init(ctx);
  82         return ctx;
  83         }
  84
  85 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
  86              const unsigned char *key, const unsigned char *iv, int enc)
  87         {
  88         if (cipher)
  89                 EVP_CIPHER_CTX_init(ctx);
  90         return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
  91         }
  92
  93 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
  94              const unsigned char *key, const unsigned char *iv, int enc)
  95         {
  96         if (enc == -1)
  97                 enc = ctx->encrypt;
  98         else
  99                 {
 100                 if (enc)
 101                         enc = 1;
 102                 ctx->encrypt = enc;
 103                 }
 104 #ifndef OPENSSL_NO_ENGINE
 105         /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
 106          * so this context may already have an ENGINE! Try to avoid releasing
 107          * the previous handle, re-querying for an ENGINE, and having a
 108          * reinitialisation, when it may all be unecessary. */
 109         if (ctx->engine && ctx->cipher && (!cipher ||
 110                         (cipher && (cipher->nid == ctx->cipher->nid))))
 111                 goto skip_to_init;
 112 #endif
 113         if (cipher)
 114                 {
 115                 /* Ensure a context left lying around from last time is cleared
 116                  * (the previous check attempted to avoid this if the same
 117                  * ENGINE and EVP_CIPHER could be used). */
 118                 EVP_CIPHER_CTX_cleanup(ctx);
 119
 120                 /* Restore encrypt field: it is zeroed by cleanup */
 121                 ctx->encrypt = enc;
 122 #ifndef OPENSSL_NO_ENGINE
 123                 if(impl)
 124                         {
 125                         if (!ENGINE_init(impl))
 126                                 {
 127                                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 128                                 return 0;
 129                                 }
 130                         }
 131                 else
 132                         /* Ask if an ENGINE is reserved for this job */
 133                         impl = ENGINE_get_cipher_engine(cipher->nid);
 134                 if(impl)
 135                         {
 136                         /* There's an ENGINE for this job ... (apparently) */
 137                         const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
 138                         if(!c)
 139                                 {
 140                                 /* One positive side-effect of US's export
 141                                  * control history, is that we should at least
 142                                  * be able to avoid using US mispellings of
 143                                  * "initialisation"? */
 144                                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 145                                 return 0;
 146                                 }
 147                         /* We'll use the ENGINE's private cipher definition */
 148                         cipher = c;
 149                         /* Store the ENGINE functional reference so we know
 150                          * 'cipher' came from an ENGINE and we need to release
 151                          * it when done. */
 152                         ctx->engine = impl;
 153                         }
 154                 else
 155                         ctx->engine = NULL;
 156 #endif
 157
 158                 ctx->cipher=cipher;
 159                 if (ctx->cipher->ctx_size)
 160                         {
 161                         ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
 162                         if (!ctx->cipher_data)
 163                                 {
 164                                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
 165                                 return 0;
 166                                 }
 167                         }
 168                 else
 169                         {
 170                         ctx->cipher_data = NULL;
 171                         }
 172                 ctx->key_len = cipher->key_len;
 173                 ctx->flags = 0;
 174                 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
 175                         {
 176                         if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
 177                                 {
 178                                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 179                                 return 0;
 180                                 }
 181                         }
 182                 }
 183         else if(!ctx->cipher)
 184                 {
 185                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
 186                 return 0;
 187                 }
 188 #ifndef OPENSSL_NO_ENGINE
 189 skip_to_init:
 190 #endif
 191         /* we assume block size is a power of 2 in *cryptUpdate */
 192         OPENSSL_assert(ctx->cipher->block_size == 1
 193             || ctx->cipher->block_size == 8
 194             || ctx->cipher->block_size == 16);
 195
 196         if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
 197                 switch(EVP_CIPHER_CTX_mode(ctx)) {
 198
 199                         case EVP_CIPH_STREAM_CIPHER:
 200                         case EVP_CIPH_ECB_MODE:
 201                         break;
 202
 203                         case EVP_CIPH_CFB_MODE:
 204                         case EVP_CIPH_OFB_MODE:
 205
 206                         ctx->num = 0;
 207
 208                         case EVP_CIPH_CBC_MODE:
 209                         case EVP_CIPH_CTR_MODE:
 210
 211                         OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
 212                                         (int)sizeof(ctx->iv));
 213                         if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 214                         /* Don't reuse IV for CTR mode */
 215                         if (EVP_CIPHER_CTX_mode(ctx) != EVP_CIPH_CTR_MODE)
 216                                 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
 217                         break;
 218
 219                         default:
 220                         return 0;
 221                         break;
 222                 }
 223         }
 224
 225         if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 226                 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
 227         }
 228         ctx->buf_len=0;
 229         ctx->final_used=0;
 230         ctx->block_mask=ctx->cipher->block_size-1;
 231         return 1;
 232         }
 233
 234 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 235              const unsigned char *in, int inl)
 236         {
 237         if (ctx->encrypt)
 238                 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
 239         else    return EVP_DecryptUpdate(ctx,out,outl,in,inl);
 240         }
 241
 242 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 243         {
 244         if (ctx->encrypt)
 245                 return EVP_EncryptFinal_ex(ctx,out,outl);
 246         else    return EVP_DecryptFinal_ex(ctx,out,outl);
 247         }
 248
 249 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 250         {
 251         if (ctx->encrypt)
 252                 return EVP_EncryptFinal(ctx,out,outl);
 253         else    return EVP_DecryptFinal(ctx,out,outl);
 254         }
 255
 256 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 257              const unsigned char *key, const unsigned char *iv)
 258         {
 259         return EVP_CipherInit(ctx, cipher, key, iv, 1);
 260         }
 261
 262 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
 263                 const unsigned char *key, const unsigned char *iv)
 264         {
 265         return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 266         }
 267
 268 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 269              const unsigned char *key, const unsigned char *iv)
 270         {
 271         return EVP_CipherInit(ctx, cipher, key, iv, 0);
 272         }
 273
 274 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
 275              const unsigned char *key, const unsigned char *iv)
 276         {
 277         return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 278         }
 279
 280 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 281              const unsigned char *in, int inl)
 282         {
 283         int i,j,bl;
 284
 285         if (inl <= 0)
 286                 {
 287                 *outl = 0;
 288                 return inl == 0;
 289                 }
 290
 291         if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
 292                 {
 293                 if(ctx->cipher->do_cipher(ctx,out,in,inl))
 294                         {
 295                         *outl=inl;
 296                         return 1;
 297                         }
 298                 else
 299                         {
 300                         *outl=0;
 301                         return 0;
 302                         }
 303                 }
 304         i=ctx->buf_len;
 305         bl=ctx->cipher->block_size;
 306         OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
 307         if (i != 0)
 308                 {
 309                 if (i+inl < bl)
 310                         {
 311                         memcpy(&(ctx->buf[i]),in,inl);
 312                         ctx->buf_len+=inl;
 313                         *outl=0;
 314                         return 1;
 315                         }
 316                 else
 317                         {
 318                         j=bl-i;
 319                         memcpy(&(ctx->buf[i]),in,j);
 320                         if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
 321                         inl-=j;
 322                         in+=j;
 323                         out+=bl;
 324                         *outl=bl;
 325                         }
 326                 }
 327         else
 328                 *outl = 0;
 329         i=inl&(bl-1);
 330         inl-=i;
 331         if (inl > 0)
 332                 {
 333                 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
 334                 *outl+=inl;
 335                 }
 336
 337         if (i != 0)
 338                 memcpy(ctx->buf,&(in[inl]),i);
 339         ctx->buf_len=i;
 340         return 1;
 341         }
 342
 343 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 344         {
 345         int ret;
 346         ret = EVP_EncryptFinal_ex(ctx, out, outl);
 347         return ret;
 348         }
 349
 350 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 351         {
 352         int n,ret;
 353         unsigned int i, b, bl;
 354
 355         b=ctx->cipher->block_size;
 356         OPENSSL_assert(b <= sizeof ctx->buf);
 357         if (b == 1)
 358                 {
 359                 *outl=0;
 360                 return 1;
 361                 }
 362         bl=ctx->buf_len;
 363         if (ctx->flags & EVP_CIPH_NO_PADDING)
 364                 {
 365                 if(bl)
 366                         {
 367                         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 368                         return 0;
 369                         }
 370                 *outl = 0;
 371                 return 1;
 372                 }
 373
 374         n=b-bl;
 375         for (i=bl; i<b; i++)
 376                 ctx->buf[i]=n;
 377         ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
 378
 379
 380         if(ret)
 381                 *outl=b;
 382
 383         return ret;
 384         }
 385
 386 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 387              const unsigned char *in, int inl)
 388         {
 389         int fix_len;
 390         unsigned int b;
 391
 392         if (inl <= 0)
 393                 {
 394                 *outl = 0;
 395                 return inl == 0;
 396                 }
 397
 398         if (ctx->flags & EVP_CIPH_NO_PADDING)
 399                 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
 400
 401         b=ctx->cipher->block_size;
 402         OPENSSL_assert(b <= sizeof ctx->final);
 403
 404         if(ctx->final_used)
 405                 {
 406                 memcpy(out,ctx->final,b);
 407                 out+=b;
 408                 fix_len = 1;
 409                 }
 410         else
 411                 fix_len = 0;
 412
 413
 414         if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
 415                 return 0;
 416
 417         /* if we have 'decrypted' a multiple of block size, make sure
 418          * we have a copy of this last block */
 419         if (b > 1 && !ctx->buf_len)
 420                 {
 421                 *outl-=b;
 422                 ctx->final_used=1;
 423                 memcpy(ctx->final,&out[*outl],b);
 424                 }
 425         else
 426                 ctx->final_used = 0;
 427
 428         if (fix_len)
 429                 *outl += b;
 430
 431         return 1;
 432         }
 433
 434 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 435         {
 436         int ret;
 437         ret = EVP_DecryptFinal_ex(ctx, out, outl);
 438         return ret;
 439         }
 440
 441 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 442         {
 443         int i,n;
 444         unsigned int b;
 445
 446         *outl=0;
 447         b=ctx->cipher->block_size;
 448         if (ctx->flags & EVP_CIPH_NO_PADDING)
 449                 {
 450                 if(ctx->buf_len)
 451                         {
 452                         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 453                         return 0;
 454                         }
 455                 *outl = 0;
 456                 return 1;
 457                 }
 458         if (b > 1)
 459                 {
 460                 if (ctx->buf_len || !ctx->final_used)
 461                         {
 462                         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 463                         return(0);
 464                         }
 465                 OPENSSL_assert(b <= sizeof ctx->final);
 466                 n=ctx->final[b-1];
 467                 if (n == 0 || n > (int)b)
 468                         {
 469                         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
 470                         return(0);
 471                         }
 472                 for (i=0; i<n; i++)
 473                         {
 474                         if (ctx->final[--b] != n)
 475                                 {
 476                                 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
 477                                 return(0);
 478                                 }
 479                         }
 480                 n=ctx->cipher->block_size-n;
 481                 for (i=0; i<n; i++)
 482                         out[i]=ctx->final[i];
 483                 *outl=n;
 484                 }
 485         else
 486                 *outl=0;
 487         return(1);
 488         }
 489
 490 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
 491         {
 492         if (ctx)
 493                 {
 494                 EVP_CIPHER_CTX_cleanup(ctx);
 495                 OPENSSL_free(ctx);
 496                 }
 497         }
 498
 499 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
 500         {
 501         if (c->cipher != NULL)
 502                 {
 503                 if(c->cipher->cleanup && !c->cipher->cleanup(c))
 504                         return 0;
 505                 /* Cleanse cipher context data */
 506                 if (c->cipher_data)
 507                         OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
 508                 }
 509         if (c->cipher_data)
 510                 OPENSSL_free(c->cipher_data);
 511 #ifndef OPENSSL_NO_ENGINE
 512         if (c->engine)
 513                 /* The EVP_CIPHER we used belongs to an ENGINE, release the
 514                  * functional reference we held for this reason. */
 515                 ENGINE_finish(c->engine);
 516 #endif
 517         memset(c,0,sizeof(EVP_CIPHER_CTX));
 518         return 1;
 519         }
 520
 521 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
 522         {
 523         if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
 524                 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
 525         if(c->key_len == keylen) return 1;
 526         if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
 527                 {
 528                 c->key_len = keylen;
 529                 return 1;
 530                 }
 531         EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
 532         return 0;
 533         }
 534
 535 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
 536         {
 537         if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
 538         else ctx->flags |= EVP_CIPH_NO_PADDING;
 539         return 1;
 540         }
 541
 542 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
 543 {
 544         int ret;
 545         if(!ctx->cipher) {
 546                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
 547                 return 0;
 548         }
 549
 550         if(!ctx->cipher->ctrl) {
 551                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
 552                 return 0;
 553         }
 554
 555         ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
 556         if(ret == -1) {
 557                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
 558                 return 0;
 559         }
 560         return ret;
 561 }
 562
 563 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
 564         {
 565         if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
 566                 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
 567         if (RAND_bytes(key, ctx->key_len) <= 0)
 568                 return 0;
 569         return 1;
 570         }
 571
 572 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
 573         {
 574         if ((in == NULL) || (in->cipher == NULL))
 575                 {
 576                 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED);
 577                 return 0;
 578                 }
 579 #ifndef OPENSSL_NO_ENGINE
 580         /* Make sure it's safe to copy a cipher context using an ENGINE */
 581         if (in->engine && !ENGINE_init(in->engine))
 582                 {
 583                 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_ENGINE_LIB);
 584                 return 0;
 585                 }
 586 #endif
 587
 588         EVP_CIPHER_CTX_cleanup(out);
 589         memcpy(out,in,sizeof *out);
 590
 591         if (in->cipher_data && in->cipher->ctx_size)
 592                 {
 593                 out->cipher_data=OPENSSL_malloc(in->cipher->ctx_size);
 594                 if (!out->cipher_data)
 595                         {
 596                         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_MALLOC_FAILURE);
 597                         return 0;
 598                         }
 599                 memcpy(out->cipher_data,in->cipher_data,in->cipher->ctx_size);
 600                 }
 601
 602         if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
 603                 return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
 604         return 1;
 605         }
 606