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 # include "evp_locl.h"
 123 #endif
 124
 125 void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
 126 {
 127     memset(ctx, '\0', sizeof *ctx);
 128 }
 129
 130 EVP_MD_CTX *EVP_MD_CTX_create(void)
 131 {
 132     EVP_MD_CTX *ctx = OPENSSL_malloc(sizeof *ctx);
 133
 134     if (ctx)
 135         EVP_MD_CTX_init(ctx);
 136
 137     return ctx;
 138 }
 139
 140 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
 141 {
 142     EVP_MD_CTX_init(ctx);
 143     return EVP_DigestInit_ex(ctx, type, NULL);
 144 }
 145
 146 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
 147 {
 148     EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
 149 #ifdef OPENSSL_FIPS
 150     /* If FIPS mode switch to approved implementation if possible */
 151     if (FIPS_mode()) {
 152         const EVP_MD *fipsmd;
 153         if (type) {
 154             fipsmd = evp_get_fips_md(type);
 155             if (fipsmd)
 156                 type = fipsmd;
 157         }
 158     }
 159 #endif
 160 #ifndef OPENSSL_NO_ENGINE
 161     /*
 162      * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
 163      * this context may already have an ENGINE! Try to avoid releasing the
 164      * previous handle, re-querying for an ENGINE, and having a
 165      * reinitialisation, when it may all be unecessary.
 166      */
 167     if (ctx->engine && ctx->digest && (!type ||
 168                                        (type
 169                                         && (type->type ==
 170                                             ctx->digest->type))))
 171         goto skip_to_init;
 172     if (type) {
 173         /*
 174          * Ensure an ENGINE left lying around from last time is cleared (the
 175          * previous check attempted to avoid this if the same ENGINE and
 176          * EVP_MD could be used).
 177          */
 178         if (ctx->engine)
 179             ENGINE_finish(ctx->engine);
 180         if (impl) {
 181             if (!ENGINE_init(impl)) {
 182                 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
 183                 return 0;
 184             }
 185         } else
 186             /* Ask if an ENGINE is reserved for this job */
 187             impl = ENGINE_get_digest_engine(type->type);
 188         if (impl) {
 189             /* There's an ENGINE for this job ... (apparently) */
 190             const EVP_MD *d = ENGINE_get_digest(impl, type->type);
 191             if (!d) {
 192                 /* Same comment from evp_enc.c */
 193                 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
 194                 ENGINE_finish(impl);
 195                 return 0;
 196             }
 197             /* We'll use the ENGINE's private digest definition */
 198             type = d;
 199             /*
 200              * Store the ENGINE functional reference so we know 'type' came
 201              * from an ENGINE and we need to release it when done.
 202              */
 203             ctx->engine = impl;
 204         } else
 205             ctx->engine = NULL;
 206     } else if (!ctx->digest) {
 207         EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET);
 208         return 0;
 209     }
 210 #endif
 211     if (ctx->digest != type) {
 212         if (ctx->digest && ctx->digest->ctx_size)
 213             OPENSSL_free(ctx->md_data);
 214         ctx->digest = type;
 215         if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
 216             ctx->update = type->update;
 217             ctx->md_data = OPENSSL_malloc(type->ctx_size);
 218             if (ctx->md_data == NULL) {
 219                 EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE);
 220                 return 0;
 221             }
 222         }
 223     }
 224 #ifndef OPENSSL_NO_ENGINE
 225  skip_to_init:
 226 #endif
 227     if (ctx->pctx) {
 228         int r;
 229         r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
 230                               EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
 231         if (r <= 0 && (r != -2))
 232             return 0;
 233     }
 234     if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
 235         return 1;
 236 #ifdef OPENSSL_FIPS
 237     if (FIPS_mode()) {
 238         if (FIPS_digestinit(ctx, type))
 239             return 1;
 240         OPENSSL_free(ctx->md_data);
 241         ctx->md_data = NULL;
 242         return 0;
 243     }
 244 #endif
 245     return ctx->digest->init(ctx);
 246 }
 247
 248 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
 249 {
 250 #ifdef OPENSSL_FIPS
 251     return FIPS_digestupdate(ctx, data, count);
 252 #else
 253     return ctx->update(ctx, data, count);
 254 #endif
 255 }
 256
 257 /* The caller can assume that this removes any secret data from the context */
 258 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
 259 {
 260     int ret;
 261     ret = EVP_DigestFinal_ex(ctx, md, size);
 262     EVP_MD_CTX_cleanup(ctx);
 263     return ret;
 264 }
 265
 266 /* The caller can assume that this removes any secret data from the context */
 267 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
 268 {
 269 #ifdef OPENSSL_FIPS
 270     return FIPS_digestfinal(ctx, md, size);
 271 #else
 272     int ret;
 273
 274     OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
 275     ret = ctx->digest->final(ctx, md);
 276     if (size != NULL)
 277         *size = ctx->digest->md_size;
 278     if (ctx->digest->cleanup) {
 279         ctx->digest->cleanup(ctx);
 280         EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
 281     }
 282     memset(ctx->md_data, 0, ctx->digest->ctx_size);
 283     return ret;
 284 #endif
 285 }
 286
 287 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
 288 {
 289     EVP_MD_CTX_init(out);
 290     return EVP_MD_CTX_copy_ex(out, in);
 291 }
 292
 293 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
 294 {
 295     unsigned char *tmp_buf;
 296     if ((in == NULL) || (in->digest == NULL)) {
 297         EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED);
 298         return 0;
 299     }
 300 #ifndef OPENSSL_NO_ENGINE
 301     /* Make sure it's safe to copy a digest context using an ENGINE */
 302     if (in->engine && !ENGINE_init(in->engine)) {
 303         EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB);
 304         return 0;
 305     }
 306 #endif
 307
 308     if (out->digest == in->digest) {
 309         tmp_buf = out->md_data;
 310         EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
 311     } else
 312         tmp_buf = NULL;
 313     EVP_MD_CTX_cleanup(out);
 314     memcpy(out, in, sizeof *out);
 315
 316     if (in->md_data && out->digest->ctx_size) {
 317         if (tmp_buf)
 318             out->md_data = tmp_buf;
 319         else {
 320             out->md_data = OPENSSL_malloc(out->digest->ctx_size);
 321             if (!out->md_data) {
 322                 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE);
 323                 return 0;
 324             }
 325         }
 326         memcpy(out->md_data, in->md_data, out->digest->ctx_size);
 327     }
 328
 329     out->update = in->update;
 330
 331     if (in->pctx) {
 332         out->pctx = EVP_PKEY_CTX_dup(in->pctx);
 333         if (!out->pctx) {
 334             EVP_MD_CTX_cleanup(out);
 335             return 0;
 336         }
 337     }
 338
 339     if (out->digest->copy)
 340         return out->digest->copy(out, in);
 341
 342     return 1;
 343 }
 344
 345 int EVP_Digest(const void *data, size_t count,
 346                unsigned char *md, unsigned int *size, const EVP_MD *type,
 347                ENGINE *impl)
 348 {
 349     EVP_MD_CTX ctx;
 350     int ret;
 351
 352     EVP_MD_CTX_init(&ctx);
 353     EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT);
 354     ret = EVP_DigestInit_ex(&ctx, type, impl)
 355         && EVP_DigestUpdate(&ctx, data, count)
 356         && EVP_DigestFinal_ex(&ctx, md, size);
 357     EVP_MD_CTX_cleanup(&ctx);
 358
 359     return ret;
 360 }
 361
 362 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
 363 {
 364     if (ctx) {
 365         EVP_MD_CTX_cleanup(ctx);
 366         OPENSSL_free(ctx);
 367     }
 368 }
 369
 370 /* This call frees resources associated with the context */
 371 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
 372 {
 373 #ifndef OPENSSL_FIPS
 374     /*
 375      * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because
 376      * sometimes only copies of the context are ever finalised.
 377      */
 378     if (ctx->digest && ctx->digest->cleanup
 379         && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED))
 380         ctx->digest->cleanup(ctx);
 381     if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
 382         && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
 383         OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
 384         OPENSSL_free(ctx->md_data);
 385     }
 386 #endif
 387     if (ctx->pctx)
 388         EVP_PKEY_CTX_free(ctx->pctx);
 389 #ifndef OPENSSL_NO_ENGINE
 390     if (ctx->engine)
 391         /*
 392          * The EVP_MD we used belongs to an ENGINE, release the functional
 393          * reference we held for this reason.
 394          */
 395         ENGINE_finish(ctx->engine);
 396 #endif
 397 #ifdef OPENSSL_FIPS
 398     FIPS_md_ctx_cleanup(ctx);
 399 #endif
 400     memset(ctx, '\0', sizeof *ctx);
 401
 402     return 1;
 403 }