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                         /* fall-through */
 208
 209                         case EVP_CIPH_CBC_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                         memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
 215                         break;
 216
 217                         case EVP_CIPH_CTR_MODE:
 218                         /* Don't reuse IV for CTR mode */
 219                         if(iv)
 220                                 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 221                         break;
 222
 223                         default:
 224                         return 0;
 225                         break;
 226                 }
 227         }
 228
 229         if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 230                 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
 231         }
 232         ctx->buf_len=0;
 233         ctx->final_used=0;
 234         ctx->block_mask=ctx->cipher->block_size-1;
 235         return 1;
 236         }
 237
 238 int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 239              const unsigned char *in, int inl)
 240         {
 241         if (ctx->encrypt)
 242                 return EVP_EncryptUpdate(ctx,out,outl,in,inl);
 243         else    return EVP_DecryptUpdate(ctx,out,outl,in,inl);
 244         }
 245
 246 int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 247         {
 248         if (ctx->encrypt)
 249                 return EVP_EncryptFinal_ex(ctx,out,outl);
 250         else    return EVP_DecryptFinal_ex(ctx,out,outl);
 251         }
 252
 253 int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 254         {
 255         if (ctx->encrypt)
 256                 return EVP_EncryptFinal(ctx,out,outl);
 257         else    return EVP_DecryptFinal(ctx,out,outl);
 258         }
 259
 260 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 261              const unsigned char *key, const unsigned char *iv)
 262         {
 263         return EVP_CipherInit(ctx, cipher, key, iv, 1);
 264         }
 265
 266 int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
 267                 const unsigned char *key, const unsigned char *iv)
 268         {
 269         return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 270         }
 271
 272 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 273              const unsigned char *key, const unsigned char *iv)
 274         {
 275         return EVP_CipherInit(ctx, cipher, key, iv, 0);
 276         }
 277
 278 int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
 279              const unsigned char *key, const unsigned char *iv)
 280         {
 281         return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 282         }
 283
 284 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 285              const unsigned char *in, int inl)
 286         {
 287         int i,j,bl;
 288
 289         if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER)
 290                 {
 291                 i = ctx->cipher->do_cipher(ctx, out, in, inl);
 292                 if (i < 0)
 293                         return 0;
 294                 else
 295                         *outl = i;
 296                 return 1;
 297                 }
 298
 299         if (inl <= 0)
 300                 {
 301                 *outl = 0;
 302                 return inl == 0;
 303                 }
 304
 305         if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
 306                 {
 307                 if(ctx->cipher->do_cipher(ctx,out,in,inl))
 308                         {
 309                         *outl=inl;
 310                         return 1;
 311                         }
 312                 else
 313                         {
 314                         *outl=0;
 315                         return 0;
 316                         }
 317                 }
 318         i=ctx->buf_len;
 319         bl=ctx->cipher->block_size;
 320         OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
 321         if (i != 0)
 322                 {
 323                 if (i+inl < bl)
 324                         {
 325                         memcpy(&(ctx->buf[i]),in,inl);
 326                         ctx->buf_len+=inl;
 327                         *outl=0;
 328                         return 1;
 329                         }
 330                 else
 331                         {
 332                         j=bl-i;
 333                         memcpy(&(ctx->buf[i]),in,j);
 334                         if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
 335                         inl-=j;
 336                         in+=j;
 337                         out+=bl;
 338                         *outl=bl;
 339                         }
 340                 }
 341         else
 342                 *outl = 0;
 343         i=inl&(bl-1);
 344         inl-=i;
 345         if (inl > 0)
 346                 {
 347                 if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
 348                 *outl+=inl;
 349                 }
 350
 351         if (i != 0)
 352                 memcpy(ctx->buf,&(in[inl]),i);
 353         ctx->buf_len=i;
 354         return 1;
 355         }
 356
 357 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 358         {
 359         int ret;
 360         ret = EVP_EncryptFinal_ex(ctx, out, outl);
 361         return ret;
 362         }
 363
 364 int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 365         {
 366         int n,ret;
 367         unsigned int i, b, bl;
 368
 369         if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER)
 370                 {
 371                 i = ctx->cipher->do_cipher(ctx, out, NULL, -1);
 372                 if (i < 0)
 373                         return 0;
 374                 else
 375                         *outl = i;
 376                 return 1;
 377                 }
 378
 379         b=ctx->cipher->block_size;
 380         OPENSSL_assert(b <= sizeof ctx->buf);
 381         if (b == 1)
 382                 {
 383                 *outl=0;
 384                 return 1;
 385                 }
 386         bl=ctx->buf_len;
 387         if (ctx->flags & EVP_CIPH_NO_PADDING)
 388                 {
 389                 if(bl)
 390                         {
 391                         EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 392                         return 0;
 393                         }
 394                 *outl = 0;
 395                 return 1;
 396                 }
 397
 398         n=b-bl;
 399         for (i=bl; i<b; i++)
 400                 ctx->buf[i]=n;
 401         ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
 402
 403
 404         if(ret)
 405                 *outl=b;
 406
 407         return ret;
 408         }
 409
 410 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 411              const unsigned char *in, int inl)
 412         {
 413         int fix_len;
 414         unsigned int b;
 415
 416         if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER)
 417                 {
 418                 fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
 419                 if (fix_len < 0)
 420                         {
 421                         *outl = 0;
 422                         return 0;
 423                         }
 424                 else
 425                         *outl = fix_len;
 426                 return 1;
 427                 }
 428
 429         if (inl <= 0)
 430                 {
 431                 *outl = 0;
 432                 return inl == 0;
 433                 }
 434
 435         if (ctx->flags & EVP_CIPH_NO_PADDING)
 436                 return EVP_EncryptUpdate(ctx, out, outl, in, inl);
 437
 438         b=ctx->cipher->block_size;
 439         OPENSSL_assert(b <= sizeof ctx->final);
 440
 441         if(ctx->final_used)
 442                 {
 443                 memcpy(out,ctx->final,b);
 444                 out+=b;
 445                 fix_len = 1;
 446                 }
 447         else
 448                 fix_len = 0;
 449
 450
 451         if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
 452                 return 0;
 453
 454         /* if we have 'decrypted' a multiple of block size, make sure
 455          * we have a copy of this last block */
 456         if (b > 1 && !ctx->buf_len)
 457                 {
 458                 *outl-=b;
 459                 ctx->final_used=1;
 460                 memcpy(ctx->final,&out[*outl],b);
 461                 }
 462         else
 463                 ctx->final_used = 0;
 464
 465         if (fix_len)
 466                 *outl += b;
 467
 468         return 1;
 469         }
 470
 471 int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 472         {
 473         int ret;
 474         ret = EVP_DecryptFinal_ex(ctx, out, outl);
 475         return ret;
 476         }
 477
 478 int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 479         {
 480         int i,n;
 481         unsigned int b;
 482         *outl=0;
 483
 484         if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER)
 485                 {
 486                 i = ctx->cipher->do_cipher(ctx, out, NULL, -1);
 487                 if (i < 0)
 488                         return 0;
 489                 else
 490                         *outl = i;
 491                 return 1;
 492                 }
 493
 494         b=ctx->cipher->block_size;
 495         if (ctx->flags & EVP_CIPH_NO_PADDING)
 496                 {
 497                 if(ctx->buf_len)
 498                         {
 499                         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
 500                         return 0;
 501                         }
 502                 *outl = 0;
 503                 return 1;
 504                 }
 505         if (b > 1)
 506                 {
 507                 if (ctx->buf_len || !ctx->final_used)
 508                         {
 509                         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 510                         return(0);
 511                         }
 512                 OPENSSL_assert(b <= sizeof ctx->final);
 513                 n=ctx->final[b-1];
 514                 if (n == 0 || n > (int)b)
 515                         {
 516                         EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
 517                         return(0);
 518                         }
 519                 for (i=0; i<n; i++)
 520                         {
 521                         if (ctx->final[--b] != n)
 522                                 {
 523                                 EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
 524                                 return(0);
 525                                 }
 526                         }
 527                 n=ctx->cipher->block_size-n;
 528                 for (i=0; i<n; i++)
 529                         out[i]=ctx->final[i];
 530                 *outl=n;
 531                 }
 532         else
 533                 *outl=0;
 534         return(1);
 535         }
 536
 537 void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
 538         {
 539         if (ctx)
 540                 {
 541                 EVP_CIPHER_CTX_cleanup(ctx);
 542                 OPENSSL_free(ctx);
 543                 }
 544         }
 545
 546 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
 547         {
 548         if (c->cipher != NULL)
 549                 {
 550                 if(c->cipher->cleanup && !c->cipher->cleanup(c))
 551                         return 0;
 552                 /* Cleanse cipher context data */
 553                 if (c->cipher_data)
 554                         OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
 555                 }
 556         if (c->cipher_data)
 557                 OPENSSL_free(c->cipher_data);
 558 #ifndef OPENSSL_NO_ENGINE
 559         if (c->engine)
 560                 /* The EVP_CIPHER we used belongs to an ENGINE, release the
 561                  * functional reference we held for this reason. */
 562                 ENGINE_finish(c->engine);
 563 #endif
 564         memset(c,0,sizeof(EVP_CIPHER_CTX));
 565         return 1;
 566         }
 567
 568 int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
 569         {
 570         if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
 571                 return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
 572         if(c->key_len == keylen) return 1;
 573         if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
 574                 {
 575                 c->key_len = keylen;
 576                 return 1;
 577                 }
 578         EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
 579         return 0;
 580         }
 581
 582 int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
 583         {
 584         if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
 585         else ctx->flags |= EVP_CIPH_NO_PADDING;
 586         return 1;
 587         }
 588
 589 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
 590 {
 591         int ret;
 592         if(!ctx->cipher) {
 593                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
 594                 return 0;
 595         }
 596
 597         if(!ctx->cipher->ctrl) {
 598                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
 599                 return 0;
 600         }
 601
 602         ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
 603         if(ret == -1) {
 604                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
 605                 return 0;
 606         }
 607         return ret;
 608 }
 609
 610 int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
 611         {
 612         if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
 613                 return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
 614         if (RAND_bytes(key, ctx->key_len) <= 0)
 615                 return 0;
 616         return 1;
 617         }
 618
 619 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
 620         {
 621         if ((in == NULL) || (in->cipher == NULL))
 622                 {
 623                 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED);
 624                 return 0;
 625                 }
 626 #ifndef OPENSSL_NO_ENGINE
 627         /* Make sure it's safe to copy a cipher context using an ENGINE */
 628         if (in->engine && !ENGINE_init(in->engine))
 629                 {
 630                 EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_ENGINE_LIB);
 631                 return 0;
 632                 }
 633 #endif
 634
 635         EVP_CIPHER_CTX_cleanup(out);
 636         memcpy(out,in,sizeof *out);
 637
 638         if (in->cipher_data && in->cipher->ctx_size)
 639                 {
 640                 out->cipher_data=OPENSSL_malloc(in->cipher->ctx_size);
 641                 if (!out->cipher_data)
 642                         {
 643                         EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_MALLOC_FAILURE);
 644                         return 0;
 645                         }
 646                 memcpy(out->cipher_data,in->cipher_data,in->cipher->ctx_size);
 647                 }
 648
 649         if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
 650                 return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
 651         return 1;
 652         }
 653