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 120void EVP_MD_CTX_init(EVP_MD_CTX *ctx) 121 { 122 memset(ctx,'\0',sizeof *ctx); 123 } 124 125EVP_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 134int 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#ifdef OPENSSL_FIPS 141 142/* The purpose of these is to trap programs that attempt to use non FIPS 143 * algorithms in FIPS mode and ignore the errors. 144 */ 145 146static int bad_init(EVP_MD_CTX *ctx) 147 { FIPS_ERROR_IGNORED("Digest init"); return 0;} 148 149static int bad_update(EVP_MD_CTX *ctx,const void *data,unsigned long count) 150 { FIPS_ERROR_IGNORED("Digest update"); return 0;} 151 152static int bad_final(EVP_MD_CTX *ctx,unsigned char *md) 153 { FIPS_ERROR_IGNORED("Digest Final"); return 0;} 154 155static const EVP_MD bad_md = 156 { 157 0, 158 0, 159 0, 160 0, 161 bad_init, 162 bad_update, 163 bad_final, 164 NULL, 165 NULL, 166 NULL, 167 0, 168 {0,0,0,0}, 169 }; 170 171#endif 172 173int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) 174 { 175 EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED); 176#ifndef OPENSSL_NO_ENGINE 177 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts 178 * so this context may already have an ENGINE! Try to avoid releasing 179 * the previous handle, re-querying for an ENGINE, and having a 180 * reinitialisation, when it may all be unecessary. */ 181 if (ctx->engine && ctx->digest && (!type || 182 (type && (type->type == ctx->digest->type)))) 183 goto skip_to_init; 184 if (type) 185 { 186 /* Ensure an ENGINE left lying around from last time is cleared 187 * (the previous check attempted to avoid this if the same 188 * ENGINE and EVP_MD could be used). */ 189 if(ctx->engine) 190 ENGINE_finish(ctx->engine); 191 if(impl) 192 { 193 if (!ENGINE_init(impl)) 194 { 195 EVPerr(EVP_F_EVP_DIGESTINIT, EVP_R_INITIALIZATION_ERROR); 196 return 0; 197 } 198 } 199 else 200 /* Ask if an ENGINE is reserved for this job */ 201 impl = ENGINE_get_digest_engine(type->type); 202 if(impl) 203 { 204 /* There's an ENGINE for this job ... (apparently) */ 205 const EVP_MD *d = ENGINE_get_digest(impl, type->type); 206 if(!d) 207 { 208 /* Same comment from evp_enc.c */ 209 EVPerr(EVP_F_EVP_DIGESTINIT, EVP_R_INITIALIZATION_ERROR); 210 return 0; 211 } 212 /* We'll use the ENGINE's private digest definition */ 213 type = d; 214 /* Store the ENGINE functional reference so we know 215 * 'type' came from an ENGINE and we need to release 216 * it when done. */ 217 ctx->engine = impl; 218 } 219 else 220 ctx->engine = NULL; 221 } 222 else 223 if(!ctx->digest) 224 { 225 EVPerr(EVP_F_EVP_DIGESTINIT, EVP_R_NO_DIGEST_SET); 226 return 0; 227 } 228#endif 229 if (ctx->digest != type) 230 { 231#ifdef OPENSSL_FIPS 232 if (FIPS_mode()) 233 { 234 if (!(type->flags & EVP_MD_FLAG_FIPS) 235 && !(ctx->flags & EVP_MD_CTX_FLAG_NON_FIPS_ALLOW)) 236 { 237 EVPerr(EVP_F_EVP_DIGESTINIT, EVP_R_DISABLED_FOR_FIPS); 238 ctx->digest = &bad_md; 239 return 0; 240 } 241 } 242#endif 243 if (ctx->digest && ctx->digest->ctx_size) 244 OPENSSL_free(ctx->md_data); 245 ctx->digest=type; 246 if (type->ctx_size) 247 ctx->md_data=OPENSSL_malloc(type->ctx_size); 248 } 249#ifndef OPENSSL_NO_ENGINE 250skip_to_init: 251#endif 252 return ctx->digest->init(ctx); 253 } 254 255int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, 256 unsigned int count) 257 { 258 return ctx->digest->update(ctx,data,(unsigned long)count); 259 } 260 261/* The caller can assume that this removes any secret data from the context */ 262int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 263 { 264 int ret; 265 ret = EVP_DigestFinal_ex(ctx, md, size); 266 EVP_MD_CTX_cleanup(ctx); 267 return ret; 268 } 269 270/* The caller can assume that this removes any secret data from the context */ 271int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 272 { 273 int ret; 274 275 OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); 276 ret=ctx->digest->final(ctx,md); 277 if (size != NULL) 278 *size=ctx->digest->md_size; 279 if (ctx->digest->cleanup) 280 { 281 ctx->digest->cleanup(ctx); 282 EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED); 283 } 284 memset(ctx->md_data,0,ctx->digest->ctx_size); 285 return ret; 286 } 287 288int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) 289 { 290 EVP_MD_CTX_init(out); 291 return EVP_MD_CTX_copy_ex(out, in); 292 } 293 294int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) 295 { 296 unsigned char *tmp_buf; 297 if ((in == NULL) || (in->digest == NULL)) 298 { 299 EVPerr(EVP_F_EVP_MD_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED); 300 return 0; 301 } 302#ifndef OPENSSL_NO_ENGINE 303 /* Make sure it's safe to copy a digest context using an ENGINE */ 304 if (in->engine && !ENGINE_init(in->engine)) 305 { 306 EVPerr(EVP_F_EVP_MD_CTX_COPY,ERR_R_ENGINE_LIB); 307 return 0; 308 } 309#endif 310 311 if (out->digest == in->digest) 312 { 313 tmp_buf = out->md_data; 314 EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE); 315 } 316 else tmp_buf = NULL; 317 EVP_MD_CTX_cleanup(out); 318 memcpy(out,in,sizeof *out); 319 320 if (out->digest->ctx_size) 321 { 322 if (tmp_buf) out->md_data = tmp_buf; 323 else out->md_data=OPENSSL_malloc(out->digest->ctx_size); 324 memcpy(out->md_data,in->md_data,out->digest->ctx_size); 325 } 326 327 if (out->digest->copy) 328 return out->digest->copy(out,in); 329 330 return 1; 331 } 332 333int EVP_Digest(void *data, unsigned int count, 334 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl) 335 { 336 EVP_MD_CTX ctx; 337 int ret; 338 339 EVP_MD_CTX_init(&ctx); 340 EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT); 341 ret=EVP_DigestInit_ex(&ctx, type, impl) 342 && EVP_DigestUpdate(&ctx, data, count) 343 && EVP_DigestFinal_ex(&ctx, md, size); 344 EVP_MD_CTX_cleanup(&ctx); 345 346 return ret; 347 } 348 349void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) 350 { 351 EVP_MD_CTX_cleanup(ctx); 352 OPENSSL_free(ctx); 353 } 354 355/* This call frees resources associated with the context */ 356int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) 357 { 358 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, 359 * because sometimes only copies of the context are ever finalised. 360 */ 361 if (ctx->digest && ctx->digest->cleanup 362 && !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED)) 363 ctx->digest->cleanup(ctx); 364 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data 365 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) 366 { 367 OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size); 368 OPENSSL_free(ctx->md_data); 369 } 370#ifndef OPENSSL_NO_ENGINE 371 if(ctx->engine) 372 /* The EVP_MD we used belongs to an ENGINE, release the 373 * functional reference we held for this reason. */ 374 ENGINE_finish(ctx->engine); 375#endif 376 memset(ctx,'\0',sizeof *ctx); 377 378 return 1; 379 } 380