1 /* $OpenBSD: digest.c,v 1.34 2022/01/10 10:51:31 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 #include "evp_locl.h" 126 127 int 128 EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) 129 { 130 EVP_MD_CTX_init(ctx); 131 return EVP_DigestInit_ex(ctx, type, NULL); 132 } 133 134 int 135 EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) 136 { 137 EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); 138 139 #ifndef OPENSSL_NO_ENGINE 140 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts 141 * so this context may already have an ENGINE! Try to avoid releasing 142 * the previous handle, re-querying for an ENGINE, and having a 143 * reinitialisation, when it may all be unecessary. */ 144 if (ctx->engine && ctx->digest && (!type || 145 (type && (type->type == ctx->digest->type)))) 146 goto skip_to_init; 147 if (type) { 148 /* Ensure an ENGINE left lying around from last time is cleared 149 * (the previous check attempted to avoid this if the same 150 * ENGINE and EVP_MD could be used). */ 151 ENGINE_finish(ctx->engine); 152 if (impl != NULL) { 153 if (!ENGINE_init(impl)) { 154 EVPerror(EVP_R_INITIALIZATION_ERROR); 155 return 0; 156 } 157 } else 158 /* Ask if an ENGINE is reserved for this job */ 159 impl = ENGINE_get_digest_engine(type->type); 160 if (impl != NULL) { 161 /* There's an ENGINE for this job ... (apparently) */ 162 const EVP_MD *d = ENGINE_get_digest(impl, type->type); 163 if (d == NULL) { 164 /* Same comment from evp_enc.c */ 165 EVPerror(EVP_R_INITIALIZATION_ERROR); 166 ENGINE_finish(impl); 167 return 0; 168 } 169 /* We'll use the ENGINE's private digest definition */ 170 type = d; 171 /* Store the ENGINE functional reference so we know 172 * 'type' came from an ENGINE and we need to release 173 * it when done. */ 174 ctx->engine = impl; 175 } else 176 ctx->engine = NULL; 177 } else if (!ctx->digest) { 178 EVPerror(EVP_R_NO_DIGEST_SET); 179 return 0; 180 } 181 #endif 182 if (ctx->digest != type) { 183 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data && 184 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) { 185 freezero(ctx->md_data, ctx->digest->ctx_size); 186 ctx->md_data = NULL; 187 } 188 ctx->digest = type; 189 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { 190 ctx->update = type->update; 191 ctx->md_data = calloc(1, type->ctx_size); 192 if (ctx->md_data == NULL) { 193 EVP_PKEY_CTX_free(ctx->pctx); 194 ctx->pctx = NULL; 195 EVPerror(ERR_R_MALLOC_FAILURE); 196 return 0; 197 } 198 } 199 } 200 #ifndef OPENSSL_NO_ENGINE 201 skip_to_init: 202 #endif 203 if (ctx->pctx) { 204 int r; 205 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, 206 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); 207 if (r <= 0 && (r != -2)) 208 return 0; 209 } 210 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) 211 return 1; 212 return ctx->digest->init(ctx); 213 } 214 215 int 216 EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) 217 { 218 return ctx->update(ctx, data, count); 219 } 220 221 /* The caller can assume that this removes any secret data from the context */ 222 int 223 EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 224 { 225 int ret; 226 227 ret = EVP_DigestFinal_ex(ctx, md, size); 228 EVP_MD_CTX_cleanup(ctx); 229 return ret; 230 } 231 232 /* The caller can assume that this removes any secret data from the context */ 233 int 234 EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) 235 { 236 int ret; 237 238 if ((size_t)ctx->digest->md_size > EVP_MAX_MD_SIZE) { 239 EVPerror(EVP_R_TOO_LARGE); 240 return 0; 241 } 242 ret = ctx->digest->final(ctx, md); 243 if (size != NULL) 244 *size = ctx->digest->md_size; 245 if (ctx->digest->cleanup) { 246 ctx->digest->cleanup(ctx); 247 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); 248 } 249 memset(ctx->md_data, 0, ctx->digest->ctx_size); 250 return ret; 251 } 252 253 int 254 EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) 255 { 256 EVP_MD_CTX_init(out); 257 return EVP_MD_CTX_copy_ex(out, in); 258 } 259 260 int 261 EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) 262 { 263 unsigned char *tmp_buf; 264 265 if ((in == NULL) || (in->digest == NULL)) { 266 EVPerror(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 EVPerror(ERR_R_ENGINE_LIB); 273 return 0; 274 } 275 #endif 276 277 if (out->digest == in->digest) { 278 tmp_buf = out->md_data; 279 EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE); 280 } else 281 tmp_buf = NULL; 282 EVP_MD_CTX_cleanup(out); 283 memcpy(out, in, sizeof *out); 284 out->md_data = NULL; 285 out->pctx = NULL; 286 287 /* 288 * Because of the EVP_PKEY_CTX_dup() below, EVP_MD_CTX_cleanup() needs 289 * to free out->pctx in all cases (even if this flag is set on in). 290 */ 291 EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX); 292 293 if (in->md_data && out->digest->ctx_size) { 294 if (tmp_buf) { 295 out->md_data = tmp_buf; 296 } else { 297 out->md_data = calloc(1, out->digest->ctx_size); 298 if (out->md_data == NULL) { 299 EVPerror(ERR_R_MALLOC_FAILURE); 300 return 0; 301 } 302 } 303 memcpy(out->md_data, in->md_data, out->digest->ctx_size); 304 } 305 306 out->update = in->update; 307 308 if (in->pctx) { 309 out->pctx = EVP_PKEY_CTX_dup(in->pctx); 310 if (!out->pctx) { 311 EVP_MD_CTX_cleanup(out); 312 return 0; 313 } 314 } 315 316 if (out->digest->copy) 317 return out->digest->copy(out, in); 318 319 return 1; 320 } 321 322 int 323 EVP_Digest(const void *data, size_t count, 324 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl) 325 { 326 EVP_MD_CTX ctx; 327 int ret; 328 329 EVP_MD_CTX_init(&ctx); 330 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT); 331 ret = EVP_DigestInit_ex(&ctx, type, impl) && 332 EVP_DigestUpdate(&ctx, data, count) && 333 EVP_DigestFinal_ex(&ctx, md, size); 334 EVP_MD_CTX_cleanup(&ctx); 335 336 return ret; 337 } 338 339 EVP_MD_CTX * 340 EVP_MD_CTX_new(void) 341 { 342 return calloc(1, sizeof(EVP_MD_CTX)); 343 } 344 345 void 346 EVP_MD_CTX_free(EVP_MD_CTX *ctx) 347 { 348 if (ctx == NULL) 349 return; 350 351 EVP_MD_CTX_cleanup(ctx); 352 353 free(ctx); 354 } 355 356 void 357 EVP_MD_CTX_init(EVP_MD_CTX *ctx) 358 { 359 memset(ctx, 0, sizeof(*ctx)); 360 } 361 362 int 363 EVP_MD_CTX_reset(EVP_MD_CTX *ctx) 364 { 365 return EVP_MD_CTX_cleanup(ctx); 366 } 367 368 EVP_MD_CTX * 369 EVP_MD_CTX_create(void) 370 { 371 return EVP_MD_CTX_new(); 372 } 373 374 void 375 EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) 376 { 377 EVP_MD_CTX_free(ctx); 378 } 379 380 /* This call frees resources associated with the context */ 381 int 382 EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) 383 { 384 /* 385 * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, 386 * because sometimes only copies of the context are ever finalised. 387 */ 388 if (ctx->digest && ctx->digest->cleanup && 389 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED)) 390 ctx->digest->cleanup(ctx); 391 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data && 392 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) 393 freezero(ctx->md_data, ctx->digest->ctx_size); 394 /* 395 * If EVP_MD_CTX_FLAG_KEEP_PKEY_CTX is set, EVP_MD_CTX_set_pkey() was 396 * called and its strange API contract implies we don't own ctx->pctx. 397 */ 398 if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX)) 399 EVP_PKEY_CTX_free(ctx->pctx); 400 #ifndef OPENSSL_NO_ENGINE 401 ENGINE_finish(ctx->engine); 402 #endif 403 memset(ctx, 0, sizeof(*ctx)); 404 405 return 1; 406 } 407 408 int 409 EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr) 410 { 411 int ret; 412 413 if (!ctx->digest) { 414 EVPerror(EVP_R_NO_CIPHER_SET); 415 return 0; 416 } 417 418 if (!ctx->digest->md_ctrl) { 419 EVPerror(EVP_R_CTRL_NOT_IMPLEMENTED); 420 return 0; 421 } 422 423 ret = ctx->digest->md_ctrl(ctx, type, arg, ptr); 424 if (ret == -1) { 425 EVPerror(EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); 426 return 0; 427 } 428 return ret; 429 } 430