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                 if (ctx->cipher)
 119                         {
 120                         unsigned long flags = ctx->flags;
 121                         EVP_CIPHER_CTX_cleanup(ctx);
 122                         /* Restore encrypt and flags */
 123                         ctx->encrypt = enc;
 124                         ctx->flags = flags;
 125                         }
 126 #ifndef OPENSSL_NO_ENGINE
 127                 if(impl)
 128                         {
 129                         if (!ENGINE_init(impl))
 130                                 {
 131                                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 132                                 return 0;
 133                                 }
 134                         }
 135                 else
 136                         /* Ask if an ENGINE is reserved for this job */
 137                         impl = ENGINE_get_cipher_engine(cipher->nid);
 138                 if(impl)
 139                         {
 140                         /* There's an ENGINE for this job ... (apparently) */
 141                         const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
 142                         if(!c)
 143                                 {
 144                                 /* One positive side-effect of US's export
 145                                  * control history, is that we should at least
 146                                  * be able to avoid using US mispellings of
 147                                  * "initialisation"? */
 148                                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 149                                 return 0;
 150                                 }
 151                         /* We'll use the ENGINE's private cipher definition */
 152                         cipher = c;
 153                         /* Store the ENGINE functional reference so we know
 154                          * 'cipher' came from an ENGINE and we need to release
 155                          * it when done. */
 156                         ctx->engine = impl;
 157                         }
 158                 else
 159                         ctx->engine = NULL;
 160 #endif
 161
 162                 ctx->cipher=cipher;
 163                 if (ctx->cipher->ctx_size)
 164                         {
 165                         ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
 166                         if (!ctx->cipher_data)
 167                                 {
 168                                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
 169                                 return 0;
 170                                 }
 171                         }
 172                 else
 173                         {
 174                         ctx->cipher_data = NULL;
 175                         }
 176                 ctx->key_len = cipher->key_len;
 177                 ctx->flags = 0;
 178                 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
 179                         {
 180                         if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
 181                                 {
 182                                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 183                                 return 0;
 184                                 }
 185                         }
 186                 }
 187         else if(!ctx->cipher)
 188                 {
 189                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
 190                 return 0;
 191                 }
 192 #ifndef OPENSSL_NO_ENGINE
 193 skip_to_init:
 194 #endif
 195         /* we assume block size is a power of 2 in *cryptUpdate */
 196         OPENSSL_assert(ctx->cipher->block_size == 1
 197             || ctx->cipher->block_size == 8
 198             || ctx->cipher->block_size == 16);
 199
 200         if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
 201                 switch(EVP_CIPHER_CTX_mode(ctx)) {
 202
 203                         case EVP_CIPH_STREAM_CIPHER:
 204                         case EVP_CIPH_ECB_MODE:
 205                         break;
 206
 207                         case EVP_CIPH_CFB_MODE:
 208                         case EVP_CIPH_OFB_MODE:
 209
 210                         ctx->num = 0;
 211                         /* fall-through */
 212
 213                         case EVP_CIPH_CBC_MODE:
 214
 215                         OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
 216                                         (int)sizeof(ctx->iv));
 217                         if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 218                         memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
 219                         break;
 220
 221                         case EVP_CIPH_CTR_MODE:
 222                         ctx->num = 0;
 223                         /* Don't reuse IV for CTR mode */
 224                         if(iv)
 225                                 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 226                         break;
 227
 228                         default:
 229                         return 0;
 230                         break;
 231                 }
 232         }
 233
 234         if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 235                 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
 236         }
 237         ctx->buf_len=0;
 238         ctx->final_used=0;
 239         ctx->block_mask=ctx->cipher->block_size-1;
 240         return 1;
 241         }
 242
 243 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 244              const unsigned char *in, int inl)
 245         {
 246         if (ctx->encrypt)
 247                 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
 248         else    return EVP_DecryptUpdate(ctx,out,outl,in,inl);
 249         }
 250
 251 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 252         {
 253         if (ctx->encrypt)
 254                 return EVP_EncryptFinal_ex(ctx,out,outl);
 255         else    return EVP_DecryptFinal_ex(ctx,out,outl);
 256         }
 257
 258 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 259         {
 260         if (ctx->encrypt)
 261                 return EVP_EncryptFinal(ctx,out,outl);
 262         else    return EVP_DecryptFinal(ctx,out,outl);
 263         }
 264
 265 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 266              const unsigned char *key, const unsigned char *iv)
 267         {
 268         return EVP_CipherInit(ctx, cipher, key, iv, 1);
 269         }
 270
 271 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
 272                 const unsigned char *key, const unsigned char *iv)
 273         {
 274         return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 275         }
 276
 277 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 278              const unsigned char *key, const unsigned char *iv)
 279         {
 280         return EVP_CipherInit(ctx, cipher, key, iv, 0);
 281         }
 282
 283 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
 284              const unsigned char *key, const unsigned char *iv)
 285         {
 286         return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 287         }
 288
 289 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 290              const unsigned char *in, int inl)
 291         {
 292         int i,j,bl;
 293
 294         if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER)
 295                 {
 296                 i = ctx->cipher->do_cipher(ctx, out, in, inl);
 297                 if (i < 0)
 298                         return 0;
 299                 else
 300                         *outl = i;
 301                 return 1;
 302                 }
 303
 304         if (inl <= 0)
 305                 {
 306                 *outl = 0;
 307                 return inl == 0;
 308                 }
 309
 310         if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
 311                 {
 312                 if(ctx->cipher->do_cipher(ctx,out,in,inl))
 313                         {
 314                         *outl=inl;
 315                         return 1;
 316                         }
 317                 else
 318                         {
 319                         *outl=0;
 320                         return 0;
 321                         }
 322                 }
 323         i=ctx->buf_len;
 324         bl=ctx->cipher->block_size;
 325         OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
 326         if (i != 0)
 327                 {
 328                 if (i+inl < bl)
 329                         {
 330                         memcpy(&(ctx->buf[i]),in,inl);
 331                         ctx->buf_len+=inl;
 332                         *outl=0;
 333                         return 1;
 334                         }
 335                 else
 336                         {
 337                         j=bl-i;
 338                         memcpy(&(ctx->buf[i]),in,j);
 339                         if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
 340                         inl-=j;
 341                         in+=j;
 342                         out+=bl;
 343                         *outl=bl;
 344                         }
 345                 }
 346         else
 347                 *outl = 0;
 348         i=inl&(bl-1);
 349         inl-=i;
 350         if (inl > 0)
 351                 {
 352                 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
 353                 *outl+=inl;
 354                 }
 355
 356         if (i != 0)
 357                 memcpy(ctx->buf,&(in[inl]),i);
 358         ctx->buf_len=i;
 359         return 1;
 360         }
 361
 362 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 363         {
 364         int ret;
 365         ret = EVP_EncryptFinal_ex(ctx, out, outl);
 366         return ret;
 367         }
 368
 369 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 370         {
 371         int n,ret;
 372         unsigned int i, b, bl;
 373
 374         if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER)
 375                 {
 376                 ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 377                 if (ret < 0)
 378                         return 0;
 379                 else
 380                         *outl = ret;
 381                 return 1;
 382                 }
 383
 384         b=ctx->cipher->block_size;
 385         OPENSSL_assert(b <= sizeof ctx->buf);
 386         if (b == 1)
 387                 {
 388                 *outl=0;
 389                 return 1;
 390                 }
 391         bl=ctx->buf_len;
 392         if (ctx->flags & EVP_CIPH_NO_PADDING)
 393                 {
 394                 if(bl)
 395                         {
 396                         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 397                         return 0;
 398                         }
 399                 *outl = 0;
 400                 return 1;
 401                 }
 402
 403         n=b-bl;
 404         for (i=bl; i<b; i++)
 405                 ctx->buf[i]=n;
 406         ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
 407
 408
 409         if(ret)
 410                 *outl=b;
 411
 412         return ret;
 413         }
 414
 415 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 416              const unsigned char *in, int inl)
 417         {
 418         int fix_len;
 419         unsigned int b;
 420
 421         if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER)
 422                 {
 423                 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
 424                 if (fix_len < 0)
 425                         {
 426                         *outl = 0;
 427                         return 0;
 428                         }
 429                 else
 430                         *outl = fix_len;
 431                 return 1;
 432                 }
 433
 434         if (inl <= 0)
 435                 {
 436                 *outl = 0;
 437                 return inl == 0;
 438                 }
 439
 440         if (ctx->flags & EVP_CIPH_NO_PADDING)
 441                 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
 442
 443         b=ctx->cipher->block_size;
 444         OPENSSL_assert(b <= sizeof ctx->final);
 445
 446         if(ctx->final_used)
 447                 {
 448                 memcpy(out,ctx->final,b);
 449                 out+=b;
 450                 fix_len = 1;
 451                 }
 452         else
 453                 fix_len = 0;
 454
 455
 456         if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
 457                 return 0;
 458
 459         /* if we have 'decrypted' a multiple of block size, make sure
 460          * we have a copy of this last block */
 461         if (b > 1 && !ctx->buf_len)
 462                 {
 463                 *outl-=b;
 464                 ctx->final_used=1;
 465                 memcpy(ctx->final,&out[*outl],b);
 466                 }
 467         else
 468                 ctx->final_used = 0;
 469
 470         if (fix_len)
 471                 *outl += b;
 472
 473         return 1;
 474         }
 475
 476 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 477         {
 478         int ret;
 479         ret = EVP_DecryptFinal_ex(ctx, out, outl);
 480         return ret;
 481         }
 482
 483 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 484         {
 485         int i,n;
 486         unsigned int b;
 487         *outl=0;
 488
 489         if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER)
 490                 {
 491                 i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
 492                 if (i < 0)
 493                         return 0;
 494                 else
 495                         *outl = i;
 496                 return 1;
 497                 }
 498
 499         b=ctx->cipher->block_size;
 500         if (ctx->flags & EVP_CIPH_NO_PADDING)
 501                 {
 502                 if(ctx->buf_len)
 503                         {
 504                         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 505                         return 0;
 506                         }
 507                 *outl = 0;
 508                 return 1;
 509                 }
 510         if (b > 1)
 511                 {
 512                 if (ctx->buf_len || !ctx->final_used)
 513                         {
 514                         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 515                         return(0);
 516                         }
 517                 OPENSSL_assert(b <= sizeof ctx->final);
 518                 n=ctx->final[b-1];
 519                 if (n == 0 || n > (int)b)
 520                         {
 521                         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
 522                         return(0);
 523                         }
 524                 for (i=0; i<n; i++)
 525                         {
 526                         if (ctx->final[--b] != n)
 527                                 {
 528                                 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
 529                                 return(0);
 530                                 }
 531                         }
 532                 n=ctx->cipher->block_size-n;
 533                 for (i=0; i<n; i++)
 534                         out[i]=ctx->final[i];
 535                 *outl=n;
 536                 }
 537         else
 538                 *outl=0;
 539         return(1);
 540         }
 541
 542 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
 543         {
 544         if (ctx)
 545                 {
 546                 EVP_CIPHER_CTX_cleanup(ctx);
 547                 OPENSSL_free(ctx);
 548                 }
 549         }
 550
 551 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
 552         {
 553         if (c->cipher != NULL)
 554                 {
 555                 if(c->cipher->cleanup && !c->cipher->cleanup(c))
 556                         return 0;
 557                 /* Cleanse cipher context data */
 558                 if (c->cipher_data)
 559                         OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
 560                 }
 561         if (c->cipher_data)
 562                 OPENSSL_free(c->cipher_data);
 563 #ifndef OPENSSL_NO_ENGINE
 564         if (c->engine)
 565                 /* The EVP_CIPHER we used belongs to an ENGINE, release the
 566                  * functional reference we held for this reason. */
 567                 ENGINE_finish(c->engine);
 568 #endif
 569         memset(c,0,sizeof(EVP_CIPHER_CTX));
 570         return 1;
 571         }
 572
 573 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
 574         {
 575         if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
 576                 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
 577         if(c->key_len == keylen) return 1;
 578         if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
 579                 {
 580                 c->key_len = keylen;
 581                 return 1;
 582                 }
 583         EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
 584         return 0;
 585         }
 586
 587 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
 588         {
 589         if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
 590         else ctx->flags |= EVP_CIPH_NO_PADDING;
 591         return 1;
 592         }
 593
 594 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
 595 {
 596         int ret;
 597         if(!ctx->cipher) {
 598                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
 599                 return 0;
 600         }
 601
 602         if(!ctx->cipher->ctrl) {
 603                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
 604                 return 0;
 605         }
 606
 607         ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
 608         if(ret == -1) {
 609                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
 610                 return 0;
 611         }
 612         return ret;
 613 }
 614
 615 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
 616         {
 617         if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
 618                 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
 619         if (RAND_bytes(key, ctx->key_len) <= 0)
 620                 return 0;
 621         return 1;
 622         }
 623
 624 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
 625         {
 626         if ((in == NULL) || (in->cipher == NULL))
 627                 {
 628                 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED);
 629                 return 0;
 630                 }
 631 #ifndef OPENSSL_NO_ENGINE
 632         /* Make sure it's safe to copy a cipher context using an ENGINE */
 633         if (in->engine && !ENGINE_init(in->engine))
 634                 {
 635                 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_ENGINE_LIB);
 636                 return 0;
 637                 }
 638 #endif
 639
 640         EVP_CIPHER_CTX_cleanup(out);
 641         memcpy(out,in,sizeof *out);
 642
 643         if (in->cipher_data && in->cipher->ctx_size)
 644                 {
 645                 out->cipher_data=OPENSSL_malloc(in->cipher->ctx_size);
 646                 if (!out->cipher_data)
 647                         {
 648                         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_MALLOC_FAILURE);
 649                         return 0;
 650                         }
 651                 memcpy(out->cipher_data,in->cipher_data,in->cipher->ctx_size);
 652                 }
 653
 654         if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
 655                 return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
 656         return 1;
 657         }
 658