1 /* $OpenBSD: digest.c,v 1.30 2018/04/14 07:09:21 tb 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 int 126 EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) 127 { 128 EVP_MD_CTX_init(ctx); 129 return EVP_DigestInit_ex(ctx, type, NULL); 130 } 131 132 int 133 EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) 134 { 135 EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); 136 137 #ifndef OPENSSL_NO_ENGINE 138 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts 139 * so this context may already have an ENGINE! Try to avoid releasing 140 * the previous handle, re-querying for an ENGINE, and having a 141 * reinitialisation, when it may all be unecessary. */ 142 if (ctx->engine && ctx->digest && (!type || 143 (type && (type->type == ctx->digest->type)))) 144 goto skip_to_init; 145 if (type) { 146 /* Ensure an ENGINE left lying around from last time is cleared 147 * (the previous check attempted to avoid this if the same 148 * ENGINE and EVP_MD could be used). */ 149 ENGINE_finish(ctx->engine); 150 if (impl != NULL) { 151 if (!ENGINE_init(impl)) { 152 EVPerror(EVP_R_INITIALIZATION_ERROR); 153 return 0; 154 } 155 } else 156 /* Ask if an ENGINE is reserved for this job */ 157 impl = ENGINE_get_digest_engine(type->type); 158 if (impl != NULL) { 159 /* There's an ENGINE for this job ... (apparently) */ 160 const EVP_MD *d = ENGINE_get_digest(impl, type->type); 161 if (d == NULL) { 162 /* Same comment from evp_enc.c */ 163 EVPerror(EVP_R_INITIALIZATION_ERROR); 164 ENGINE_finish(impl); 165 return 0; 166 } 167 /* We'll use the ENGINE's private digest definition */ 168 type = d; 169 /* Store the ENGINE functional reference so we know 170 * 'type' came from an ENGINE and we need to release 171 * it when done. */ 172 ctx->engine = impl; 173 } else 174 ctx->engine = NULL; 175 } else if (!ctx->digest) { 176 EVPerror(EVP_R_NO_DIGEST_SET); 177 return 0; 178 } 179 #endif 180 if (ctx->digest != type) { 181 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data && 182 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) { 183 freezero(ctx->md_data, ctx->digest->ctx_size); 184 ctx->md_data = NULL; 185 } 186 ctx->digest = type; 187 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { 188 ctx->update = type->update; 189 ctx->md_data = malloc(type->ctx_size); 190 if (ctx->md_data == NULL) { 191 EVP_PKEY_CTX_free(ctx->pctx); 192 ctx->pctx = NULL; 193 EVPerror(ERR_R_MALLOC_FAILURE); 194 return 0; 195 } 196 } 197 } 198 #ifndef OPENSSL_NO_ENGINE 199 skip_to_init: 200 #endif 201 if (ctx->pctx) { 202 int r; 203 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, 204 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); 205 if (r <= 0 && (r != -2)) 206 return 0; 207 } 208 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) 209 return 1; 210 return ctx->digest->init(ctx); 211 } 212 213 int 214 EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) 215 { 216 return ctx->update(ctx, data, count); 217 } 218 219 /* The caller can assume that this removes any secret data from the context */ 220 int 221 EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 222 { 223 int ret; 224 225 ret = EVP_DigestFinal_ex(ctx, md, size); 226 EVP_MD_CTX_cleanup(ctx); 227 return ret; 228 } 229 230 /* The caller can assume that this removes any secret data from the context */ 231 int 232 EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 233 { 234 int ret; 235 236 if ((size_t)ctx->digest->md_size > EVP_MAX_MD_SIZE) { 237 EVPerror(EVP_R_TOO_LARGE); 238 return 0; 239 } 240 ret = ctx->digest->final(ctx, md); 241 if (size != NULL) 242 *size = ctx->digest->md_size; 243 if (ctx->digest->cleanup) { 244 ctx->digest->cleanup(ctx); 245 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); 246 } 247 memset(ctx->md_data, 0, ctx->digest->ctx_size); 248 return ret; 249 } 250 251 int 252 EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) 253 { 254 EVP_MD_CTX_init(out); 255 return EVP_MD_CTX_copy_ex(out, in); 256 } 257 258 int 259 EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) 260 { 261 unsigned char *tmp_buf; 262 263 if ((in == NULL) || (in->digest == NULL)) { 264 EVPerror(EVP_R_INPUT_NOT_INITIALIZED); 265 return 0; 266 } 267 #ifndef OPENSSL_NO_ENGINE 268 /* Make sure it's safe to copy a digest context using an ENGINE */ 269 if (in->engine && !ENGINE_init(in->engine)) { 270 EVPerror(ERR_R_ENGINE_LIB); 271 return 0; 272 } 273 #endif 274 275 if (out->digest == in->digest) { 276 tmp_buf = out->md_data; 277 EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE); 278 } else 279 tmp_buf = NULL; 280 EVP_MD_CTX_cleanup(out); 281 memcpy(out, in, sizeof *out); 282 283 if (in->md_data && out->digest->ctx_size) { 284 if (tmp_buf) 285 out->md_data = tmp_buf; 286 else { 287 out->md_data = malloc(out->digest->ctx_size); 288 if (!out->md_data) { 289 EVPerror(ERR_R_MALLOC_FAILURE); 290 return 0; 291 } 292 } 293 memcpy(out->md_data, in->md_data, out->digest->ctx_size); 294 } 295 296 out->update = in->update; 297 298 if (in->pctx) { 299 out->pctx = EVP_PKEY_CTX_dup(in->pctx); 300 if (!out->pctx) { 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 313 EVP_Digest(const void *data, size_t count, 314 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl) 315 { 316 EVP_MD_CTX ctx; 317 int ret; 318 319 EVP_MD_CTX_init(&ctx); 320 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT); 321 ret = EVP_DigestInit_ex(&ctx, type, impl) && 322 EVP_DigestUpdate(&ctx, data, count) && 323 EVP_DigestFinal_ex(&ctx, md, size); 324 EVP_MD_CTX_cleanup(&ctx); 325 326 return ret; 327 } 328 329 EVP_MD_CTX * 330 EVP_MD_CTX_new(void) 331 { 332 return calloc(1, sizeof(EVP_MD_CTX)); 333 } 334 335 void 336 EVP_MD_CTX_free(EVP_MD_CTX *ctx) 337 { 338 if (ctx == NULL) 339 return; 340 341 EVP_MD_CTX_cleanup(ctx); 342 343 free(ctx); 344 } 345 346 void 347 EVP_MD_CTX_init(EVP_MD_CTX *ctx) 348 { 349 memset(ctx, 0, sizeof(*ctx)); 350 } 351 352 int 353 EVP_MD_CTX_reset(EVP_MD_CTX *ctx) 354 { 355 return EVP_MD_CTX_cleanup(ctx); 356 } 357 358 EVP_MD_CTX * 359 EVP_MD_CTX_create(void) 360 { 361 return EVP_MD_CTX_new(); 362 } 363 364 void 365 EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) 366 { 367 EVP_MD_CTX_free(ctx); 368 } 369 370 /* This call frees resources associated with the context */ 371 int 372 EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) 373 { 374 /* 375 * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, 376 * because sometimes only copies of the context are ever finalised. 377 */ 378 if (ctx->digest && ctx->digest->cleanup && 379 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED)) 380 ctx->digest->cleanup(ctx); 381 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data && 382 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) 383 freezero(ctx->md_data, ctx->digest->ctx_size); 384 EVP_PKEY_CTX_free(ctx->pctx); 385 #ifndef OPENSSL_NO_ENGINE 386 ENGINE_finish(ctx->engine); 387 #endif 388 memset(ctx, 0, sizeof(*ctx)); 389 390 return 1; 391 } 392 393 int 394 EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr) 395 { 396 int ret; 397 398 if (!ctx->digest) { 399 EVPerror(EVP_R_NO_CIPHER_SET); 400 return 0; 401 } 402 403 if (!ctx->digest->md_ctrl) { 404 EVPerror(EVP_R_CTRL_NOT_IMPLEMENTED); 405 return 0; 406 } 407 408 ret = ctx->digest->md_ctrl(ctx, type, arg, ptr); 409 if (ret == -1) { 410 EVPerror(EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); 411 return 0; 412 } 413 return ret; 414 } 415