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