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 119 120 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 if (ctx) 130 EVP_MD_CTX_init(ctx); 131 132 return ctx; 133 } 134 135 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) 136 { 137 EVP_MD_CTX_init(ctx); 138 return EVP_DigestInit_ex(ctx, type, NULL); 139 } 140 141 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) 142 { 143 EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED); 144 #ifndef OPENSSL_NO_ENGINE 145 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts 146 * so this context may already have an ENGINE! Try to avoid releasing 147 * the previous handle, re-querying for an ENGINE, and having a 148 * reinitialisation, when it may all be unecessary. */ 149 if (ctx->engine && ctx->digest && (!type || 150 (type && (type->type == ctx->digest->type)))) 151 goto skip_to_init; 152 if (type) 153 { 154 /* Ensure an ENGINE left lying around from last time is cleared 155 * (the previous check attempted to avoid this if the same 156 * ENGINE and EVP_MD could be used). */ 157 if(ctx->engine) 158 ENGINE_finish(ctx->engine); 159 if(impl) 160 { 161 if (!ENGINE_init(impl)) 162 { 163 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR); 164 return 0; 165 } 166 } 167 else 168 /* Ask if an ENGINE is reserved for this job */ 169 impl = ENGINE_get_digest_engine(type->type); 170 if(impl) 171 { 172 /* There's an ENGINE for this job ... (apparently) */ 173 const EVP_MD *d = ENGINE_get_digest(impl, type->type); 174 if(!d) 175 { 176 /* Same comment from evp_enc.c */ 177 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR); 178 ENGINE_finish(impl); 179 return 0; 180 } 181 /* We'll use the ENGINE's private digest definition */ 182 type = d; 183 /* Store the ENGINE functional reference so we know 184 * 'type' came from an ENGINE and we need to release 185 * it when done. */ 186 ctx->engine = impl; 187 } 188 else 189 ctx->engine = NULL; 190 } 191 else 192 if(!ctx->digest) 193 { 194 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_NO_DIGEST_SET); 195 return 0; 196 } 197 #endif 198 if (ctx->digest != type) 199 { 200 if (ctx->digest && ctx->digest->ctx_size) 201 OPENSSL_free(ctx->md_data); 202 ctx->digest=type; 203 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) 204 { 205 ctx->update = type->update; 206 ctx->md_data=OPENSSL_malloc(type->ctx_size); 207 if (ctx->md_data == NULL) 208 { 209 EVPerr(EVP_F_EVP_DIGESTINIT_EX, 210 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 { 220 int r; 221 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, 222 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); 223 if (r <= 0 && (r != -2)) 224 return 0; 225 } 226 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) 227 return 1; 228 return ctx->digest->init(ctx); 229 } 230 231 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) 232 { 233 return ctx->update(ctx,data,count); 234 } 235 236 /* The caller can assume that this removes any secret data from the context */ 237 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 238 { 239 int ret; 240 ret = EVP_DigestFinal_ex(ctx, md, size); 241 EVP_MD_CTX_cleanup(ctx); 242 return ret; 243 } 244 245 /* The caller can assume that this removes any secret data from the context */ 246 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 247 { 248 int ret; 249 250 OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); 251 ret=ctx->digest->final(ctx,md); 252 if (size != NULL) 253 *size=ctx->digest->md_size; 254 if (ctx->digest->cleanup) 255 { 256 ctx->digest->cleanup(ctx); 257 EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED); 258 } 259 memset(ctx->md_data,0,ctx->digest->ctx_size); 260 return ret; 261 } 262 263 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) 264 { 265 EVP_MD_CTX_init(out); 266 return EVP_MD_CTX_copy_ex(out, in); 267 } 268 269 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) 270 { 271 unsigned char *tmp_buf; 272 if ((in == NULL) || (in->digest == NULL)) 273 { 274 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED); 275 return 0; 276 } 277 #ifndef OPENSSL_NO_ENGINE 278 /* Make sure it's safe to copy a digest context using an ENGINE */ 279 if (in->engine && !ENGINE_init(in->engine)) 280 { 281 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB); 282 return 0; 283 } 284 #endif 285 286 if (out->digest == in->digest) 287 { 288 tmp_buf = out->md_data; 289 EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE); 290 } 291 else tmp_buf = NULL; 292 EVP_MD_CTX_cleanup(out); 293 memcpy(out,in,sizeof *out); 294 295 if (in->md_data && out->digest->ctx_size) 296 { 297 if (tmp_buf) 298 out->md_data = tmp_buf; 299 else 300 { 301 out->md_data=OPENSSL_malloc(out->digest->ctx_size); 302 if (!out->md_data) 303 { 304 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_MALLOC_FAILURE); 305 return 0; 306 } 307 } 308 memcpy(out->md_data,in->md_data,out->digest->ctx_size); 309 } 310 311 out->update = in->update; 312 313 if (in->pctx) 314 { 315 out->pctx = EVP_PKEY_CTX_dup(in->pctx); 316 if (!out->pctx) 317 { 318 EVP_MD_CTX_cleanup(out); 319 return 0; 320 } 321 } 322 323 if (out->digest->copy) 324 return out->digest->copy(out,in); 325 326 return 1; 327 } 328 329 int EVP_Digest(const void *data, size_t count, 330 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl) 331 { 332 EVP_MD_CTX ctx; 333 int ret; 334 335 EVP_MD_CTX_init(&ctx); 336 EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT); 337 ret=EVP_DigestInit_ex(&ctx, type, impl) 338 && EVP_DigestUpdate(&ctx, data, count) 339 && EVP_DigestFinal_ex(&ctx, md, size); 340 EVP_MD_CTX_cleanup(&ctx); 341 342 return ret; 343 } 344 345 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) 346 { 347 EVP_MD_CTX_cleanup(ctx); 348 OPENSSL_free(ctx); 349 } 350 351 /* This call frees resources associated with the context */ 352 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) 353 { 354 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, 355 * because sometimes only copies of the context are ever finalised. 356 */ 357 if (ctx->digest && ctx->digest->cleanup 358 && !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED)) 359 ctx->digest->cleanup(ctx); 360 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data 361 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) 362 { 363 OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size); 364 OPENSSL_free(ctx->md_data); 365 } 366 if (ctx->pctx) 367 EVP_PKEY_CTX_free(ctx->pctx); 368 #ifndef OPENSSL_NO_ENGINE 369 if(ctx->engine) 370 /* The EVP_MD we used belongs to an ENGINE, release the 371 * functional reference we held for this reason. */ 372 ENGINE_finish(ctx->engine); 373 #endif 374 memset(ctx,'\0',sizeof *ctx); 375 376 return 1; 377 } 378
