release/src/router/openssl/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 #ifdef OPENSSL_FIPS
 121 # include <openssl/fips.h>
 122 #endif
 123
 124 void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
 125 {
 126     memset(ctx, '\0', sizeof *ctx);
 127 }
 128
 129 EVP_MD_CTX *EVP_MD_CTX_create(void)
 130 {
 131     EVP_MD_CTX *ctx = OPENSSL_malloc(sizeof *ctx);
 132
 133     if (ctx)
 134         EVP_MD_CTX_init(ctx);
 135
 136     return ctx;
 137 }
 138
 139 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
 140 {
 141     EVP_MD_CTX_init(ctx);
 142     return EVP_DigestInit_ex(ctx, type, NULL);
 143 }
 144
 145 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
 146 {
 147     EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
 148 #ifndef OPENSSL_NO_ENGINE
 149     /*
 150      * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
 151      * this context may already have an ENGINE! Try to avoid releasing the
 152      * previous handle, re-querying for an ENGINE, and having a
 153      * reinitialisation, when it may all be unecessary.
 154      */
 155     if (ctx->engine && ctx->digest && (!type ||
 156                                        (type
 157                                         && (type->type ==
 158                                             ctx->digest->type))))
 159         goto skip_to_init;
 160     if (type) {
 161         /*
 162          * Ensure an ENGINE left lying around from last time is cleared (the
 163          * previous check attempted to avoid this if the same ENGINE and
 164          * EVP_MD could be used).
 165          */
 166         if (ctx->engine)
 167             ENGINE_finish(ctx->engine);
 168         if (impl) {
 169             if (!ENGINE_init(impl)) {
 170                 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
 171                 return 0;
 172             }
 173         } else
 174             /* Ask if an ENGINE is reserved for this job */
 175             impl = ENGINE_get_digest_engine(type->type);
 176         if (impl) {
 177             /* There's an ENGINE for this job ... (apparently) */
 178             const EVP_MD *d = ENGINE_get_digest(impl, type->type);
 179             if (!d) {
 180                 /* Same comment from evp_enc.c */
 181                 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
 182                 ENGINE_finish(impl);
 183                 return 0;
 184             }
 185             /* We'll use the ENGINE's private digest definition */
 186             type = d;
 187             /*
 188              * Store the ENGINE functional reference so we know 'type' came
 189              * from an ENGINE and we need to release it when done.
 190              */
 191             ctx->engine = impl;
 192         } else
 193             ctx->engine = NULL;
 194     } else {
 195         if (!ctx->digest) {
 196             EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET);
 197             return 0;
 198         }
 199         type = ctx->digest;
 200     }
 201 #endif
 202     if (ctx->digest != type) {
 203         if (ctx->digest && ctx->digest->ctx_size)
 204             OPENSSL_free(ctx->md_data);
 205         ctx->digest = type;
 206         if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
 207             ctx->update = type->update;
 208             ctx->md_data = OPENSSL_malloc(type->ctx_size);
 209             if (ctx->md_data == NULL) {
 210                 EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE);
 211                 return 0;
 212             }
 213         }
 214     }
 215 #ifndef OPENSSL_NO_ENGINE
 216  skip_to_init:
 217 #endif
 218     if (ctx->pctx) {
 219         int r;
 220         r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
 221                               EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
 222         if (r <= 0 && (r != -2))
 223             return 0;
 224     }
 225     if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
 226         return 1;
 227 #ifdef OPENSSL_FIPS
 228     if (FIPS_mode()) {
 229         if (FIPS_digestinit(ctx, type))
 230             return 1;
 231         OPENSSL_free(ctx->md_data);
 232         ctx->md_data = NULL;
 233         return 0;
 234     }
 235 #endif
 236     return ctx->digest->init(ctx);
 237 }
 238
 239 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
 240 {
 241 #ifdef OPENSSL_FIPS
 242     return FIPS_digestupdate(ctx, data, count);
 243 #else
 244     return ctx->update(ctx, data, count);
 245 #endif
 246 }
 247
 248 /* The caller can assume that this removes any secret data from the context */
 249 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
 250 {
 251     int ret;
 252     ret = EVP_DigestFinal_ex(ctx, md, size);
 253     EVP_MD_CTX_cleanup(ctx);
 254     return ret;
 255 }
 256
 257 /* The caller can assume that this removes any secret data from the context */
 258 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
 259 {
 260 #ifdef OPENSSL_FIPS
 261     return FIPS_digestfinal(ctx, md, size);
 262 #else
 263     int ret;
 264
 265     OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
 266     ret = ctx->digest->final(ctx, md);
 267     if (size != NULL)
 268         *size = ctx->digest->md_size;
 269     if (ctx->digest->cleanup) {
 270         ctx->digest->cleanup(ctx);
 271         EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
 272     }
 273     memset(ctx->md_data, 0, ctx->digest->ctx_size);
 274     return ret;
 275 #endif
 276 }
 277
 278 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
 279 {
 280     EVP_MD_CTX_init(out);
 281     return EVP_MD_CTX_copy_ex(out, in);
 282 }
 283
 284 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
 285 {
 286     unsigned char *tmp_buf;
 287     if ((in == NULL) || (in->digest == NULL)) {
 288         EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED);
 289         return 0;
 290     }
 291 #ifndef OPENSSL_NO_ENGINE
 292     /* Make sure it's safe to copy a digest context using an ENGINE */
 293     if (in->engine && !ENGINE_init(in->engine)) {
 294         EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB);
 295         return 0;
 296     }
 297 #endif
 298
 299     if (out->digest == in->digest) {
 300         tmp_buf = out->md_data;
 301         EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
 302     } else
 303         tmp_buf = NULL;
 304     EVP_MD_CTX_cleanup(out);
 305     memcpy(out, in, sizeof *out);
 306
 307     if (in->md_data && out->digest->ctx_size) {
 308         if (tmp_buf)
 309             out->md_data = tmp_buf;
 310         else {
 311             out->md_data = OPENSSL_malloc(out->digest->ctx_size);
 312             if (!out->md_data) {
 313                 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE);
 314                 return 0;
 315             }
 316         }
 317         memcpy(out->md_data, in->md_data, out->digest->ctx_size);
 318     }
 319
 320     out->update = in->update;
 321
 322     if (in->pctx) {
 323         out->pctx = EVP_PKEY_CTX_dup(in->pctx);
 324         if (!out->pctx) {
 325             EVP_MD_CTX_cleanup(out);
 326             return 0;
 327         }
 328     }
 329
 330     if (out->digest->copy)
 331         return out->digest->copy(out, in);
 332
 333     return 1;
 334 }
 335
 336 int EVP_Digest(const void *data, size_t count,
 337                unsigned char *md, unsigned int *size, const EVP_MD *type,
 338                ENGINE *impl)
 339 {
 340     EVP_MD_CTX ctx;
 341     int ret;
 342
 343     EVP_MD_CTX_init(&ctx);
 344     EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT);
 345     ret = EVP_DigestInit_ex(&ctx, type, impl)
 346         && EVP_DigestUpdate(&ctx, data, count)
 347         && EVP_DigestFinal_ex(&ctx, md, size);
 348     EVP_MD_CTX_cleanup(&ctx);
 349
 350     return ret;
 351 }
 352
 353 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
 354 {
 355     if (ctx) {
 356         EVP_MD_CTX_cleanup(ctx);
 357         OPENSSL_free(ctx);
 358     }
 359 }
 360
 361 /* This call frees resources associated with the context */
 362 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
 363 {
 364 #ifndef OPENSSL_FIPS
 365     /*
 366      * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because
 367      * sometimes only copies of the context are ever finalised.
 368      */
 369     if (ctx->digest && ctx->digest->cleanup
 370         && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED))
 371         ctx->digest->cleanup(ctx);
 372     if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
 373         && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
 374         OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
 375         OPENSSL_free(ctx->md_data);
 376     }
 377 #endif
 378     if (ctx->pctx)
 379         EVP_PKEY_CTX_free(ctx->pctx);
 380 #ifndef OPENSSL_NO_ENGINE
 381     if (ctx->engine)
 382         /*
 383          * The EVP_MD we used belongs to an ENGINE, release the functional
 384          * reference we held for this reason.
 385          */
 386         ENGINE_finish(ctx->engine);
 387 #endif
 388 #ifdef OPENSSL_FIPS
 389     FIPS_md_ctx_cleanup(ctx);
 390 #endif
 391     memset(ctx, '\0', sizeof *ctx);
 392
 393     return 1;
 394 }