1 /* crypto/evp/digest.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh (at) 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 #include "evp_locl.h" 120 121 void EVP_MD_CTX_init(EVP_MD_CTX *ctx) 122 { 123 memset(ctx,'\0',sizeof *ctx); 124 } 125 126 EVP_MD_CTX *EVP_MD_CTX_create(void) 127 { 128 EVP_MD_CTX *ctx=OPENSSL_malloc(sizeof *ctx); 129 130 if (ctx) 131 EVP_MD_CTX_init(ctx); 132 133 return ctx; 134 } 135 136 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) 137 { 138 EVP_MD_CTX_init(ctx); 139 return EVP_DigestInit_ex(ctx, type, NULL); 140 } 141 142 #ifdef OPENSSL_FIPS 143 144 /* The purpose of these is to trap programs that attempt to use non FIPS 145 * algorithms in FIPS mode and ignore the errors. 146 */ 147 148 static int bad_init(EVP_MD_CTX *ctx) 149 { FIPS_ERROR_IGNORED("Digest init"); return 0;} 150 151 static int bad_update(EVP_MD_CTX *ctx,const void *data,size_t count) 152 { FIPS_ERROR_IGNORED("Digest update"); return 0;} 153 154 static int bad_final(EVP_MD_CTX *ctx,unsigned char *md) 155 { FIPS_ERROR_IGNORED("Digest Final"); return 0;} 156 157 static const EVP_MD bad_md = 158 { 159 0, 160 0, 161 0, 162 0, 163 bad_init, 164 bad_update, 165 bad_final, 166 NULL, 167 NULL, 168 NULL, 169 0, 170 {0,0,0,0}, 171 }; 172 173 #endif 174 175 #ifndef OPENSSL_NO_ENGINE 176 177 #ifdef OPENSSL_FIPS 178 179 static int do_engine_null(ENGINE *impl) { return 0;} 180 static int do_evp_md_engine_null(EVP_MD_CTX *ctx, 181 const EVP_MD **ptype, ENGINE *impl) 182 { return 1; } 183 184 static int (*do_engine_init)(ENGINE *impl) 185 = do_engine_null; 186 187 static int (*do_engine_finish)(ENGINE *impl) 188 = do_engine_null; 189 190 static int (*do_evp_md_engine) 191 (EVP_MD_CTX *ctx, const EVP_MD **ptype, ENGINE *impl) 192 = do_evp_md_engine_null; 193 194 void int_EVP_MD_set_engine_callbacks( 195 int (*eng_md_init)(ENGINE *impl), 196 int (*eng_md_fin)(ENGINE *impl), 197 int (*eng_md_evp) 198 (EVP_MD_CTX *ctx, const EVP_MD **ptype, ENGINE *impl)) 199 { 200 do_engine_init = eng_md_init; 201 do_engine_finish = eng_md_fin; 202 do_evp_md_engine = eng_md_evp; 203 } 204 205 #else 206 207 #define do_engine_init ENGINE_init 208 #define do_engine_finish ENGINE_finish 209 210 static int do_evp_md_engine(EVP_MD_CTX *ctx, const EVP_MD **ptype, ENGINE *impl) 211 { 212 if (*ptype) 213 { 214 /* Ensure an ENGINE left lying around from last time is cleared 215 * (the previous check attempted to avoid this if the same 216 * ENGINE and EVP_MD could be used). */ 217 if(ctx->engine) 218 ENGINE_finish(ctx->engine); 219 if(impl) 220 { 221 if (!ENGINE_init(impl)) 222 { 223 EVPerr(EVP_F_DO_EVP_MD_ENGINE,EVP_R_INITIALIZATION_ERROR); 224 return 0; 225 } 226 } 227 else 228 /* Ask if an ENGINE is reserved for this job */ 229 impl = ENGINE_get_digest_engine((*ptype)->type); 230 if(impl) 231 { 232 /* There's an ENGINE for this job ... (apparently) */ 233 const EVP_MD *d = ENGINE_get_digest(impl, (*ptype)->type); 234 if(!d) 235 { 236 /* Same comment from evp_enc.c */ 237 EVPerr(EVP_F_DO_EVP_MD_ENGINE,EVP_R_INITIALIZATION_ERROR); 238 return 0; 239 } 240 /* We'll use the ENGINE's private digest definition */ 241 *ptype = d; 242 /* Store the ENGINE functional reference so we know 243 * 'type' came from an ENGINE and we need to release 244 * it when done. */ 245 ctx->engine = impl; 246 } 247 else 248 ctx->engine = NULL; 249 } 250 else 251 if(!ctx->digest) 252 { 253 EVPerr(EVP_F_DO_EVP_MD_ENGINE,EVP_R_NO_DIGEST_SET); 254 return 0; 255 } 256 return 1; 257 } 258 259 #endif 260 261 #endif 262 263 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) 264 { 265 M_EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED); 266 #ifdef OPENSSL_FIPS 267 if(FIPS_selftest_failed()) 268 { 269 FIPSerr(FIPS_F_EVP_DIGESTINIT_EX,FIPS_R_FIPS_SELFTEST_FAILED); 270 ctx->digest = &bad_md; 271 return 0; 272 } 273 #endif 274 #ifndef OPENSSL_NO_ENGINE 275 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts 276 * so this context may already have an ENGINE! Try to avoid releasing 277 * the previous handle, re-querying for an ENGINE, and having a 278 * reinitialisation, when it may all be unecessary. */ 279 if (ctx->engine && ctx->digest && (!type || 280 (type && (type->type == ctx->digest->type)))) 281 goto skip_to_init; 282 if (!do_evp_md_engine(ctx, &type, impl)) 283 return 0; 284 #endif 285 if (ctx->digest != type) 286 { 287 #ifdef OPENSSL_FIPS 288 if (FIPS_mode()) 289 { 290 if (!(type->flags & EVP_MD_FLAG_FIPS) 291 && !(ctx->flags & EVP_MD_CTX_FLAG_NON_FIPS_ALLOW)) 292 { 293 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_DISABLED_FOR_FIPS); 294 ctx->digest = &bad_md; 295 return 0; 296 } 297 } 298 #endif 299 if (ctx->digest && ctx->digest->ctx_size) 300 OPENSSL_free(ctx->md_data); 301 ctx->digest=type; 302 if (type->ctx_size) 303 { 304 ctx->md_data=OPENSSL_malloc(type->ctx_size); 305 if (!ctx->md_data) 306 { 307 EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE); 308 return 0; 309 } 310 } 311 } 312 #ifndef OPENSSL_NO_ENGINE 313 skip_to_init: 314 #endif 315 return ctx->digest->init(ctx); 316 } 317 318 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, 319 size_t count) 320 { 321 #ifdef OPENSSL_FIPS 322 FIPS_selftest_check(); 323 #endif 324 return ctx->digest->update(ctx,data,count); 325 } 326 327 /* The caller can assume that this removes any secret data from the context */ 328 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 329 { 330 int ret; 331 ret = EVP_DigestFinal_ex(ctx, md, size); 332 EVP_MD_CTX_cleanup(ctx); 333 return ret; 334 } 335 336 /* The caller can assume that this removes any secret data from the context */ 337 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 338 { 339 int ret; 340 #ifdef OPENSSL_FIPS 341 FIPS_selftest_check(); 342 #endif 343 344 OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); 345 ret=ctx->digest->final(ctx,md); 346 if (size != NULL) 347 *size=ctx->digest->md_size; 348 if (ctx->digest->cleanup) 349 { 350 ctx->digest->cleanup(ctx); 351 M_EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED); 352 } 353 memset(ctx->md_data,0,ctx->digest->ctx_size); 354 return ret; 355 } 356 357 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) 358 { 359 EVP_MD_CTX_init(out); 360 return EVP_MD_CTX_copy_ex(out, in); 361 } 362 363 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) 364 { 365 unsigned char *tmp_buf; 366 if ((in == NULL) || (in->digest == NULL)) 367 { 368 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED); 369 return 0; 370 } 371 #ifndef OPENSSL_NO_ENGINE 372 /* Make sure it's safe to copy a digest context using an ENGINE */ 373 if (in->engine && !do_engine_init(in->engine)) 374 { 375 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB); 376 return 0; 377 } 378 #endif 379 380 if (out->digest == in->digest) 381 { 382 tmp_buf = out->md_data; 383 M_EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE); 384 } 385 else tmp_buf = NULL; 386 EVP_MD_CTX_cleanup(out); 387 memcpy(out,in,sizeof *out); 388 389 if (out->digest->ctx_size) 390 { 391 if (tmp_buf) 392 out->md_data = tmp_buf; 393 else 394 { 395 out->md_data=OPENSSL_malloc(out->digest->ctx_size); 396 if (!out->md_data) 397 { 398 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_MALLOC_FAILURE); 399 return 0; 400 } 401 } 402 memcpy(out->md_data,in->md_data,out->digest->ctx_size); 403 } 404 405 if (out->digest->copy) 406 return out->digest->copy(out,in); 407 408 return 1; 409 } 410 411 int EVP_Digest(const void *data, size_t count, 412 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl) 413 { 414 EVP_MD_CTX ctx; 415 int ret; 416 417 EVP_MD_CTX_init(&ctx); 418 M_EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT); 419 ret=EVP_DigestInit_ex(&ctx, type, impl) 420 && EVP_DigestUpdate(&ctx, data, count) 421 && EVP_DigestFinal_ex(&ctx, md, size); 422 EVP_MD_CTX_cleanup(&ctx); 423 424 return ret; 425 } 426 427 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) 428 { 429 EVP_MD_CTX_cleanup(ctx); 430 OPENSSL_free(ctx); 431 } 432 433 /* This call frees resources associated with the context */ 434 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) 435 { 436 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, 437 * because sometimes only copies of the context are ever finalised. 438 */ 439 if (ctx->digest && ctx->digest->cleanup 440 && !M_EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED)) 441 ctx->digest->cleanup(ctx); 442 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data 443 && !M_EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) 444 { 445 OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size); 446 OPENSSL_free(ctx->md_data); 447 } 448 #ifndef OPENSSL_NO_ENGINE 449 if(ctx->engine) 450 /* The EVP_MD we used belongs to an ENGINE, release the 451 * functional reference we held for this reason. */ 452 do_engine_finish(ctx->engine); 453 #endif 454 memset(ctx,'\0',sizeof *ctx); 455 456 return 1; 457 } 458
