crypto/openssl-0.9.7e/crypto/evp/digest.c

   1 /* crypto/evp/digest.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  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <stdio.h>
 113 #include "cryptlib.h"
 114 #include <openssl/objects.h>
 115 #include <openssl/evp.h>
 116 #ifndef OPENSSL_NO_ENGINE
 117 #include <openssl/engine.h>
 118 #endif
 119
 120 void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
 121         {
 122         memset(ctx,'\0',sizeof *ctx);
 123         }
 124
 125 EVP_MD_CTX *EVP_MD_CTX_create(void)
 126         {
 127         EVP_MD_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
 128
 129         EVP_MD_CTX_init(ctx);
 130
 131         return ctx;
 132         }
 133
 134 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
 135         {
 136         EVP_MD_CTX_init(ctx);
 137         return EVP_DigestInit_ex(ctx, type, NULL);
 138         }
 139
 140 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
 141         {
 142         EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
 143 #ifndef OPENSSL_NO_ENGINE
 144         /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
 145          * so this context may already have an ENGINE! Try to avoid releasing
 146          * the previous handle, re-querying for an ENGINE, and having a
 147          * reinitialisation, when it may all be unecessary. */
 148         if (ctx->engine && ctx->digest && (!type ||
 149                         (type && (type->type == ctx->digest->type))))
 150                 goto skip_to_init;
 151         if (type)
 152                 {
 153                 /* Ensure an ENGINE left lying around from last time is cleared
 154                  * (the previous check attempted to avoid this if the same
 155                  * ENGINE and EVP_MD could be used). */
 156                 if(ctx->engine)
 157                         ENGINE_finish(ctx->engine);
 158                 if(impl)
 159                         {
 160                         if (!ENGINE_init(impl))
 161                                 {
 162                                 EVPerr(EVP_F_EVP_DIGESTINIT, EVP_R_INITIALIZATION_ERROR);
 163                                 return 0;
 164                                 }
 165                         }
 166                 else
 167                         /* Ask if an ENGINE is reserved for this job */
 168                         impl = ENGINE_get_digest_engine(type->type);
 169                 if(impl)
 170                         {
 171                         /* There's an ENGINE for this job ... (apparently) */
 172                         const EVP_MD *d = ENGINE_get_digest(impl, type->type);
 173                         if(!d)
 174                                 {
 175                                 /* Same comment from evp_enc.c */
 176                                 EVPerr(EVP_F_EVP_DIGESTINIT, EVP_R_INITIALIZATION_ERROR);
 177                                 return 0;
 178                                 }
 179                         /* We'll use the ENGINE's private digest definition */
 180                         type = d;
 181                         /* Store the ENGINE functional reference so we know
 182                          * 'type' came from an ENGINE and we need to release
 183                          * it when done. */
 184                         ctx->engine = impl;
 185                         }
 186                 else
 187                         ctx->engine = NULL;
 188                 }
 189         else
 190         if(!ctx->digest)
 191                 {
 192                 EVPerr(EVP_F_EVP_DIGESTINIT, EVP_R_NO_DIGEST_SET);
 193                 return 0;
 194                 }
 195 #endif
 196         if (ctx->digest != type)
 197                 {
 198                 if (ctx->digest && ctx->digest->ctx_size)
 199                         OPENSSL_free(ctx->md_data);
 200                 ctx->digest=type;
 201                 if (type->ctx_size)
 202                         ctx->md_data=OPENSSL_malloc(type->ctx_size);
 203                 }
 204 #ifndef OPENSSL_NO_ENGINE
 205 skip_to_init:
 206 #endif
 207         return ctx->digest->init(ctx);
 208         }
 209
 210 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data,
 211              unsigned int count)
 212         {
 213         return ctx->digest->update(ctx,data,(unsigned long)count);
 214         }
 215
 216 /* The caller can assume that this removes any secret data from the context */
 217 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
 218         {
 219         int ret;
 220         ret = EVP_DigestFinal_ex(ctx, md, size);
 221         EVP_MD_CTX_cleanup(ctx);
 222         return ret;
 223         }
 224
 225 /* The caller can assume that this removes any secret data from the context */
 226 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
 227         {
 228         int ret;
 229
 230         OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
 231         ret=ctx->digest->final(ctx,md);
 232         if (size != NULL)
 233                 *size=ctx->digest->md_size;
 234         if (ctx->digest->cleanup)
 235                 {
 236                 ctx->digest->cleanup(ctx);
 237                 EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
 238                 }
 239         memset(ctx->md_data,0,ctx->digest->ctx_size);
 240         return ret;
 241         }
 242
 243 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
 244         {
 245         EVP_MD_CTX_init(out);
 246         return EVP_MD_CTX_copy_ex(out, in);
 247         }
 248
 249 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
 250         {
 251         unsigned char *tmp_buf;
 252         if ((in == NULL) || (in->digest == NULL))
 253                 {
 254                 EVPerr(EVP_F_EVP_MD_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED);
 255                 return 0;
 256                 }
 257 #ifndef OPENSSL_NO_ENGINE
 258         /* Make sure it's safe to copy a digest context using an ENGINE */
 259         if (in->engine && !ENGINE_init(in->engine))
 260                 {
 261                 EVPerr(EVP_F_EVP_MD_CTX_COPY,ERR_R_ENGINE_LIB);
 262                 return 0;
 263                 }
 264 #endif
 265
 266         if (out->digest == in->digest)
 267                 {
 268                 tmp_buf = out->md_data;
 269                 EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE);
 270                 }
 271         else tmp_buf = NULL;
 272         EVP_MD_CTX_cleanup(out);
 273         memcpy(out,in,sizeof *out);
 274
 275         if (out->digest->ctx_size)
 276                 {
 277                 if (tmp_buf) out->md_data = tmp_buf;
 278                 else out->md_data=OPENSSL_malloc(out->digest->ctx_size);
 279                 memcpy(out->md_data,in->md_data,out->digest->ctx_size);
 280                 }
 281
 282         if (out->digest->copy)
 283                 return out->digest->copy(out,in);
 284
 285         return 1;
 286         }
 287
 288 int EVP_Digest(void *data, unsigned int count,
 289                 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl)
 290         {
 291         EVP_MD_CTX ctx;
 292         int ret;
 293
 294         EVP_MD_CTX_init(&ctx);
 295         EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT);
 296         ret=EVP_DigestInit_ex(&ctx, type, impl)
 297           && EVP_DigestUpdate(&ctx, data, count)
 298           && EVP_DigestFinal_ex(&ctx, md, size);
 299         EVP_MD_CTX_cleanup(&ctx);
 300
 301         return ret;
 302         }
 303
 304 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
 305         {
 306         EVP_MD_CTX_cleanup(ctx);
 307         OPENSSL_free(ctx);
 308         }
 309
 310 /* This call frees resources associated with the context */
 311 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
 312         {
 313         /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final,
 314          * because sometimes only copies of the context are ever finalised.
 315          */
 316         if (ctx->digest && ctx->digest->cleanup
 317             && !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED))
 318                 ctx->digest->cleanup(ctx);
 319         if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
 320             && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE))
 321                 {
 322                 OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size);
 323                 OPENSSL_free(ctx->md_data);
 324                 }
 325 #ifndef OPENSSL_NO_ENGINE
 326         if(ctx->engine)
 327                 /* The EVP_MD we used belongs to an ENGINE, release the
 328                  * functional reference we held for this reason. */
 329                 ENGINE_finish(ctx->engine);
 330 #endif
 331         memset(ctx,'\0',sizeof *ctx);
 332
 333         return 1;
 334         }