crypto/openssl/crypto/evp/enc_min.c

   1 /* crypto/evp/enc_min.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 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
  70         {
  71 #ifdef OPENSSL_FIPS
  72         FIPS_selftest_check();
  73 #endif
  74         memset(ctx,0,sizeof(EVP_CIPHER_CTX));
  75         /* ctx->cipher=NULL; */
  76         }
  77
  78 #ifdef OPENSSL_FIPS
  79
  80 /* The purpose of these is to trap programs that attempt to use non FIPS
  81  * algorithms in FIPS mode and ignore the errors.
  82  */
  83
  84 static int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  85                     const unsigned char *iv, int enc)
  86         { FIPS_ERROR_IGNORED("Cipher init"); return 0;}
  87
  88 static int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  89                          const unsigned char *in, unsigned int inl)
  90         { FIPS_ERROR_IGNORED("Cipher update"); return 0;}
  91
  92 /* NB: no cleanup because it is allowed after failed init */
  93
  94 static int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
  95         { FIPS_ERROR_IGNORED("Cipher set_asn1"); return 0;}
  96 static int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
  97         { FIPS_ERROR_IGNORED("Cipher get_asn1"); return 0;}
  98 static int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
  99         { FIPS_ERROR_IGNORED("Cipher ctrl"); return 0;}
 100
 101 static const EVP_CIPHER bad_cipher =
 102         {
 103         0,
 104         0,
 105         0,
 106         0,
 107         0,
 108         bad_init,
 109         bad_do_cipher,
 110         NULL,
 111         0,
 112         bad_set_asn1,
 113         bad_get_asn1,
 114         bad_ctrl,
 115         NULL
 116         };
 117
 118 #endif
 119
 120 #ifndef OPENSSL_NO_ENGINE
 121
 122 #ifdef OPENSSL_FIPS
 123
 124 static int do_engine_null(ENGINE *impl) { return 0;}
 125 static int do_evp_enc_engine_null(EVP_CIPHER_CTX *ctx,
 126                                 const EVP_CIPHER **pciph, ENGINE *impl)
 127         { return 1; }
 128
 129 static int (*do_engine_finish)(ENGINE *impl)
 130                 = do_engine_null;
 131
 132 static int (*do_evp_enc_engine)
 133         (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl)
 134                 = do_evp_enc_engine_null;
 135
 136 void int_EVP_CIPHER_set_engine_callbacks(
 137         int (*eng_ciph_fin)(ENGINE *impl),
 138         int (*eng_ciph_evp)
 139                 (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl))
 140         {
 141         do_engine_finish = eng_ciph_fin;
 142         do_evp_enc_engine = eng_ciph_evp;
 143         }
 144
 145 #else
 146
 147 #define do_engine_finish ENGINE_finish
 148
 149 static int do_evp_enc_engine(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl)
 150         {
 151         if(impl)
 152                 {
 153                 if (!ENGINE_init(impl))
 154                         {
 155                         EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR);
 156                         return 0;
 157                         }
 158                 }
 159         else
 160                 /* Ask if an ENGINE is reserved for this job */
 161                 impl = ENGINE_get_cipher_engine((*pcipher)->nid);
 162         if(impl)
 163                 {
 164                 /* There's an ENGINE for this job ... (apparently) */
 165                 const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid);
 166                 if(!c)
 167                         {
 168                         /* One positive side-effect of US's export
 169                          * control history, is that we should at least
 170                          * be able to avoid using US mispellings of
 171                          * "initialisation"? */
 172                         EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR);
 173                         return 0;
 174                         }
 175                 /* We'll use the ENGINE's private cipher definition */
 176                 *pcipher = c;
 177                 /* Store the ENGINE functional reference so we know
 178                  * 'cipher' came from an ENGINE and we need to release
 179                  * it when done. */
 180                 ctx->engine = impl;
 181                 }
 182         else
 183                 ctx->engine = NULL;
 184         return 1;
 185         }
 186
 187 #endif
 188
 189 #endif
 190
 191 int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
 192              const unsigned char *key, const unsigned char *iv, int enc)
 193         {
 194         if (enc == -1)
 195                 enc = ctx->encrypt;
 196         else
 197                 {
 198                 if (enc)
 199                         enc = 1;
 200                 ctx->encrypt = enc;
 201                 }
 202 #ifdef OPENSSL_FIPS
 203         if(FIPS_selftest_failed())
 204                 {
 205                 FIPSerr(FIPS_F_EVP_CIPHERINIT_EX,FIPS_R_FIPS_SELFTEST_FAILED);
 206                 ctx->cipher = &bad_cipher;
 207                 return 0;
 208                 }
 209 #endif
 210 #ifndef OPENSSL_NO_ENGINE
 211         /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
 212          * so this context may already have an ENGINE! Try to avoid releasing
 213          * the previous handle, re-querying for an ENGINE, and having a
 214          * reinitialisation, when it may all be unecessary. */
 215         if (ctx->engine && ctx->cipher && (!cipher ||
 216                         (cipher && (cipher->nid == ctx->cipher->nid))))
 217                 goto skip_to_init;
 218 #endif
 219         if (cipher)
 220                 {
 221                 /* Ensure a context left lying around from last time is cleared
 222                  * (the previous check attempted to avoid this if the same
 223                  * ENGINE and EVP_CIPHER could be used). */
 224                 EVP_CIPHER_CTX_cleanup(ctx);
 225
 226                 /* Restore encrypt field: it is zeroed by cleanup */
 227                 ctx->encrypt = enc;
 228 #ifndef OPENSSL_NO_ENGINE
 229                 if (!do_evp_enc_engine(ctx, &cipher, impl))
 230                         return 0;
 231 #endif
 232
 233                 ctx->cipher=cipher;
 234                 if (ctx->cipher->ctx_size)
 235                         {
 236                         ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
 237                         if (!ctx->cipher_data)
 238                                 {
 239                                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
 240                                 return 0;
 241                                 }
 242                         }
 243                 else
 244                         {
 245                         ctx->cipher_data = NULL;
 246                         }
 247                 ctx->key_len = cipher->key_len;
 248                 ctx->flags = 0;
 249                 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
 250                         {
 251                         if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
 252                                 {
 253                                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
 254                                 return 0;
 255                                 }
 256                         }
 257                 }
 258         else if(!ctx->cipher)
 259                 {
 260                 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
 261                 return 0;
 262                 }
 263 #ifndef OPENSSL_NO_ENGINE
 264 skip_to_init:
 265 #endif
 266         /* we assume block size is a power of 2 in *cryptUpdate */
 267         OPENSSL_assert(ctx->cipher->block_size == 1
 268             || ctx->cipher->block_size == 8
 269             || ctx->cipher->block_size == 16);
 270
 271         if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
 272                 switch(EVP_CIPHER_CTX_mode(ctx)) {
 273
 274                         case EVP_CIPH_STREAM_CIPHER:
 275                         case EVP_CIPH_ECB_MODE:
 276                         break;
 277
 278                         case EVP_CIPH_CFB_MODE:
 279                         case EVP_CIPH_OFB_MODE:
 280
 281                         ctx->num = 0;
 282
 283                         case EVP_CIPH_CBC_MODE:
 284
 285                         OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
 286                                         (int)sizeof(ctx->iv));
 287                         if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
 288                         memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
 289                         break;
 290
 291                         default:
 292                         return 0;
 293                         break;
 294                 }
 295         }
 296
 297 #ifdef OPENSSL_FIPS
 298         /* After 'key' is set no further parameters changes are permissible.
 299          * So only check for non FIPS enabling at this point.
 300          */
 301         if (key && FIPS_mode())
 302                 {
 303                 if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS)
 304                         & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
 305                         {
 306                         EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_DISABLED_FOR_FIPS);
 307 #if 0
 308                         ERR_add_error_data(2, "cipher=",
 309                                                 EVP_CIPHER_name(ctx->cipher));
 310 #endif
 311                         ctx->cipher = &bad_cipher;
 312                         return 0;
 313                         }
 314                 }
 315 #endif
 316
 317         if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
 318                 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
 319         }
 320         ctx->buf_len=0;
 321         ctx->final_used=0;
 322         ctx->block_mask=ctx->cipher->block_size-1;
 323         return 1;
 324         }
 325
 326 int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
 327         {
 328         if (c->cipher != NULL)
 329                 {
 330                 if(c->cipher->cleanup && !c->cipher->cleanup(c))
 331                         return 0;
 332                 /* Cleanse cipher context data */
 333                 if (c->cipher_data)
 334                         OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
 335                 }
 336         if (c->cipher_data)
 337                 OPENSSL_free(c->cipher_data);
 338 #ifndef OPENSSL_NO_ENGINE
 339         if (c->engine)
 340                 /* The EVP_CIPHER we used belongs to an ENGINE, release the
 341                  * functional reference we held for this reason. */
 342                 do_engine_finish(c->engine);
 343 #endif
 344         memset(c,0,sizeof(EVP_CIPHER_CTX));
 345         return 1;
 346         }
 347
 348 int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, unsigned int inl)
 349         {
 350 #ifdef OPENSSL_FIPS
 351         FIPS_selftest_check();
 352 #endif
 353         return ctx->cipher->do_cipher(ctx,out,in,inl);
 354         }
 355
 356 int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
 357 {
 358         int ret;
 359         if(!ctx->cipher) {
 360                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
 361                 return 0;
 362         }
 363
 364         if(!ctx->cipher->ctrl) {
 365                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
 366                 return 0;
 367         }
 368
 369         ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
 370         if(ret == -1) {
 371                 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
 372                 return 0;
 373         }
 374         return ret;
 375 }
 376
 377 unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)
 378         {
 379         return ctx->cipher->flags;
 380         }
 381
 382 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
 383         {
 384         return ctx->cipher->iv_len;
 385         }
 386
 387 int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
 388         {
 389         return cipher->nid;
 390         }