1 /* $OpenBSD: digest.c,v 1.25 2015/02/10 09:52:35 miod Exp $ */ 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 <string.h> 114 115 #include <openssl/opensslconf.h> 116 117 #include <openssl/err.h> 118 #include <openssl/evp.h> 119 #include <openssl/objects.h> 120 121 #ifndef OPENSSL_NO_ENGINE 122 #include <openssl/engine.h> 123 #endif 124 125 void 126 EVP_MD_CTX_init(EVP_MD_CTX *ctx) 127 { 128 memset(ctx, 0, sizeof *ctx); 129 } 130 131 EVP_MD_CTX * 132 EVP_MD_CTX_create(void) 133 { 134 return calloc(1, sizeof(EVP_MD_CTX)); 135 } 136 137 int 138 EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) 139 { 140 EVP_MD_CTX_init(ctx); 141 return EVP_DigestInit_ex(ctx, type, NULL); 142 } 143 144 int 145 EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) 146 { 147 EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); 148 149 #ifndef OPENSSL_NO_ENGINE 150 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts 151 * so this context may already have an ENGINE! Try to avoid releasing 152 * the previous handle, re-querying for an ENGINE, and having a 153 * reinitialisation, when it may all be unecessary. */ 154 if (ctx->engine && ctx->digest && (!type || 155 (type && (type->type == ctx->digest->type)))) 156 goto skip_to_init; 157 if (type) { 158 /* Ensure an ENGINE left lying around from last time is cleared 159 * (the previous check attempted to avoid this if the same 160 * ENGINE and EVP_MD could be used). */ 161 if (ctx->engine) 162 ENGINE_finish(ctx->engine); 163 if (impl) { 164 if (!ENGINE_init(impl)) { 165 EVPerr(EVP_F_EVP_DIGESTINIT_EX, 166 EVP_R_INITIALIZATION_ERROR); 167 return 0; 168 } 169 } else 170 /* Ask if an ENGINE is reserved for this job */ 171 impl = ENGINE_get_digest_engine(type->type); 172 if (impl) { 173 /* There's an ENGINE for this job ... (apparently) */ 174 const EVP_MD *d = ENGINE_get_digest(impl, type->type); 175 if (!d) { 176 /* Same comment from evp_enc.c */ 177 EVPerr(EVP_F_EVP_DIGESTINIT_EX, 178 EVP_R_INITIALIZATION_ERROR); 179 ENGINE_finish(impl); 180 return 0; 181 } 182 /* We'll use the ENGINE's private digest definition */ 183 type = d; 184 /* Store the ENGINE functional reference so we know 185 * 'type' came from an ENGINE and we need to release 186 * it when done. */ 187 ctx->engine = impl; 188 } else 189 ctx->engine = NULL; 190 } else if (!ctx->digest) { 191 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET); 192 return 0; 193 } 194 #endif 195 if (ctx->digest != type) { 196 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data && 197 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) { 198 explicit_bzero(ctx->md_data, ctx->digest->ctx_size); 199 free(ctx->md_data); 200 ctx->md_data = NULL; 201 } 202 ctx->digest = type; 203 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { 204 ctx->update = type->update; 205 ctx->md_data = malloc(type->ctx_size); 206 if (ctx->md_data == NULL) { 207 EVP_PKEY_CTX_free(ctx->pctx); 208 ctx->pctx = NULL; 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 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 231 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 238 EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 239 { 240 int ret; 241 242 ret = EVP_DigestFinal_ex(ctx, md, size); 243 EVP_MD_CTX_cleanup(ctx); 244 return ret; 245 } 246 247 /* The caller can assume that this removes any secret data from the context */ 248 int 249 EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 250 { 251 int ret; 252 253 if ((size_t)ctx->digest->md_size > EVP_MAX_MD_SIZE) { 254 EVPerr(EVP_F_EVP_DIGESTFINAL_EX, EVP_R_TOO_LARGE); 255 return 0; 256 } 257 ret = ctx->digest->final(ctx, md); 258 if (size != NULL) 259 *size = ctx->digest->md_size; 260 if (ctx->digest->cleanup) { 261 ctx->digest->cleanup(ctx); 262 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); 263 } 264 memset(ctx->md_data, 0, ctx->digest->ctx_size); 265 return ret; 266 } 267 268 int 269 EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) 270 { 271 EVP_MD_CTX_init(out); 272 return EVP_MD_CTX_copy_ex(out, in); 273 } 274 275 int 276 EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) 277 { 278 unsigned char *tmp_buf; 279 280 if ((in == NULL) || (in->digest == NULL)) { 281 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED); 282 return 0; 283 } 284 #ifndef OPENSSL_NO_ENGINE 285 /* Make sure it's safe to copy a digest context using an ENGINE */ 286 if (in->engine && !ENGINE_init(in->engine)) { 287 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB); 288 return 0; 289 } 290 #endif 291 292 if (out->digest == in->digest) { 293 tmp_buf = out->md_data; 294 EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE); 295 } else 296 tmp_buf = NULL; 297 EVP_MD_CTX_cleanup(out); 298 memcpy(out, in, sizeof *out); 299 300 if (in->md_data && out->digest->ctx_size) { 301 if (tmp_buf) 302 out->md_data = tmp_buf; 303 else { 304 out->md_data = malloc(out->digest->ctx_size); 305 if (!out->md_data) { 306 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, 307 ERR_R_MALLOC_FAILURE); 308 return 0; 309 } 310 } 311 memcpy(out->md_data, in->md_data, out->digest->ctx_size); 312 } 313 314 out->update = in->update; 315 316 if (in->pctx) { 317 out->pctx = EVP_PKEY_CTX_dup(in->pctx); 318 if (!out->pctx) { 319 EVP_MD_CTX_cleanup(out); 320 return 0; 321 } 322 } 323 324 if (out->digest->copy) 325 return out->digest->copy(out, in); 326 327 return 1; 328 } 329 330 int 331 EVP_Digest(const void *data, size_t count, 332 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl) 333 { 334 EVP_MD_CTX ctx; 335 int ret; 336 337 EVP_MD_CTX_init(&ctx); 338 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT); 339 ret = EVP_DigestInit_ex(&ctx, type, impl) && 340 EVP_DigestUpdate(&ctx, data, count) && 341 EVP_DigestFinal_ex(&ctx, md, size); 342 EVP_MD_CTX_cleanup(&ctx); 343 344 return ret; 345 } 346 347 void 348 EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) 349 { 350 if (ctx) { 351 EVP_MD_CTX_cleanup(ctx); 352 free(ctx); 353 } 354 } 355 356 /* This call frees resources associated with the context */ 357 int 358 EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) 359 { 360 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, 361 * because sometimes only copies of the context are ever finalised. 362 */ 363 if (ctx->digest && ctx->digest->cleanup && 364 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED)) 365 ctx->digest->cleanup(ctx); 366 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data && 367 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) { 368 explicit_bzero(ctx->md_data, ctx->digest->ctx_size); 369 free(ctx->md_data); 370 } 371 EVP_PKEY_CTX_free(ctx->pctx); 372 #ifndef OPENSSL_NO_ENGINE 373 if (ctx->engine) 374 /* The EVP_MD we used belongs to an ENGINE, release the 375 * functional reference we held for this reason. */ 376 ENGINE_finish(ctx->engine); 377 #endif 378 memset(ctx, 0, sizeof *ctx); 379 380 return 1; 381 } 382 383 int 384 EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr) 385 { 386 int ret; 387 388 if (!ctx->digest) { 389 EVPerr(EVP_F_EVP_MD_CTX_CTRL, EVP_R_NO_CIPHER_SET); 390 return 0; 391 } 392 393 if (!ctx->digest->md_ctrl) { 394 EVPerr(EVP_F_EVP_MD_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); 395 return 0; 396 } 397 398 ret = ctx->digest->md_ctrl(ctx, type, arg, ptr); 399 if (ret == -1) { 400 EVPerr(EVP_F_EVP_MD_CTX_CTRL, 401 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); 402 return 0; 403 } 404 return ret; 405 } 406