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 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 return 0; 179 } 180 /* We'll use the ENGINE's private digest definition */ 181 type = d; 182 /* Store the ENGINE functional reference so we know 183 * 'type' came from an ENGINE and we need to release 184 * it when done. */ 185 ctx->engine = impl; 186 } 187 else 188 ctx->engine = NULL; 189 } 190 else 191 if(!ctx->digest) 192 { 193 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_NO_DIGEST_SET); 194 return 0; 195 } 196 #endif 197 if (ctx->digest != type) 198 { 199 if (ctx->digest && ctx->digest->ctx_size) 200 OPENSSL_free(ctx->md_data); 201 ctx->digest=type; 202 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) 203 { 204 ctx->update = type->update; 205 ctx->md_data=OPENSSL_malloc(type->ctx_size); 206 if (ctx->md_data == NULL) 207 { 208 EVPerr(EVP_F_EVP_DIGESTINIT_EX, 209 ERR_R_MALLOC_FAILURE); 210 return 0; 211 } 212 } 213 } 214 #ifndef OPENSSL_NO_ENGINE 215 skip_to_init: 216 #endif 217 if (ctx->pctx) 218 { 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 return ctx->digest->init(ctx); 228 } 229 230 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) 231 { 232 return ctx->update(ctx,data,count); 233 } 234 235 /* The caller can assume that this removes any secret data from the context */ 236 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 237 { 238 int ret; 239 ret = EVP_DigestFinal_ex(ctx, md, size); 240 EVP_MD_CTX_cleanup(ctx); 241 return ret; 242 } 243 244 /* The caller can assume that this removes any secret data from the context */ 245 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 246 { 247 int ret; 248 249 OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); 250 ret=ctx->digest->final(ctx,md); 251 if (size != NULL) 252 *size=ctx->digest->md_size; 253 if (ctx->digest->cleanup) 254 { 255 ctx->digest->cleanup(ctx); 256 EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED); 257 } 258 memset(ctx->md_data,0,ctx->digest->ctx_size); 259 return ret; 260 } 261 262 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) 263 { 264 EVP_MD_CTX_init(out); 265 return EVP_MD_CTX_copy_ex(out, in); 266 } 267 268 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) 269 { 270 unsigned char *tmp_buf; 271 if ((in == NULL) || (in->digest == NULL)) 272 { 273 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED); 274 return 0; 275 } 276 #ifndef OPENSSL_NO_ENGINE 277 /* Make sure it's safe to copy a digest context using an ENGINE */ 278 if (in->engine && !ENGINE_init(in->engine)) 279 { 280 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB); 281 return 0; 282 } 283 #endif 284 285 if (out->digest == in->digest) 286 { 287 tmp_buf = out->md_data; 288 EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE); 289 } 290 else tmp_buf = NULL; 291 EVP_MD_CTX_cleanup(out); 292 memcpy(out,in,sizeof *out); 293 294 if (in->md_data && out->digest->ctx_size) 295 { 296 if (tmp_buf) 297 out->md_data = tmp_buf; 298 else 299 { 300 out->md_data=OPENSSL_malloc(out->digest->ctx_size); 301 if (!out->md_data) 302 { 303 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_MALLOC_FAILURE); 304 return 0; 305 } 306 } 307 memcpy(out->md_data,in->md_data,out->digest->ctx_size); 308 } 309 310 out->update = in->update; 311 312 if (in->pctx) 313 { 314 out->pctx = EVP_PKEY_CTX_dup(in->pctx); 315 if (!out->pctx) 316 { 317 EVP_MD_CTX_cleanup(out); 318 return 0; 319 } 320 } 321 322 if (out->digest->copy) 323 return out->digest->copy(out,in); 324 325 return 1; 326 } 327 328 int EVP_Digest(const void *data, size_t count, 329 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl) 330 { 331 EVP_MD_CTX ctx; 332 int ret; 333 334 EVP_MD_CTX_init(&ctx); 335 EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT); 336 ret=EVP_DigestInit_ex(&ctx, type, impl) 337 && EVP_DigestUpdate(&ctx, data, count) 338 && EVP_DigestFinal_ex(&ctx, md, size); 339 EVP_MD_CTX_cleanup(&ctx); 340 341 return ret; 342 } 343 344 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) 345 { 346 EVP_MD_CTX_cleanup(ctx); 347 OPENSSL_free(ctx); 348 } 349 350 /* This call frees resources associated with the context */ 351 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) 352 { 353 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, 354 * because sometimes only copies of the context are ever finalised. 355 */ 356 if (ctx->digest && ctx->digest->cleanup 357 && !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED)) 358 ctx->digest->cleanup(ctx); 359 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data 360 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) 361 { 362 OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size); 363 OPENSSL_free(ctx->md_data); 364 } 365 if (ctx->pctx) 366 EVP_PKEY_CTX_free(ctx->pctx); 367 #ifndef OPENSSL_NO_ENGINE 368 if(ctx->engine) 369 /* The EVP_MD we used belongs to an ENGINE, release the 370 * functional reference we held for this reason. */ 371 ENGINE_finish(ctx->engine); 372 #endif 373 memset(ctx,'\0',sizeof *ctx); 374 375 return 1; 376 } 377