Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | ENGINE_finish(impl); |
| 179 | return 0; |
| 180 | } |
| 181 | /* We'll use the ENGINE's private digest definition */ |
| 182 | type = d; |
| 183 | /* Store the ENGINE functional reference so we know |
| 184 | * 'type' came from an ENGINE and we need to release |
| 185 | * it when done. */ |
| 186 | ctx->engine = impl; |
| 187 | } |
| 188 | else |
| 189 | ctx->engine = NULL; |
| 190 | } |
| 191 | else |
| 192 | if(!ctx->digest) |
| 193 | { |
| 194 | EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_NO_DIGEST_SET); |
| 195 | return 0; |
| 196 | } |
| 197 | #endif |
| 198 | if (ctx->digest != type) |
| 199 | { |
| 200 | if (ctx->digest && ctx->digest->ctx_size) |
| 201 | OPENSSL_free(ctx->md_data); |
| 202 | ctx->digest=type; |
| 203 | if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) |
| 204 | { |
| 205 | ctx->update = type->update; |
| 206 | ctx->md_data=OPENSSL_malloc(type->ctx_size); |
| 207 | if (ctx->md_data == NULL) |
| 208 | { |
| 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 | { |
| 220 | int r; |
| 221 | r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, |
| 222 | EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); |
| 223 | if (r <= 0 && (r != -2)) |
| 224 | return 0; |
| 225 | } |
| 226 | if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) |
| 227 | return 1; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 228 | return ctx->digest->init(ctx); |
| 229 | } |
| 230 | |
| 231 | int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) |
| 232 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 233 | return ctx->update(ctx,data,count); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 234 | } |
| 235 | |
| 236 | /* The caller can assume that this removes any secret data from the context */ |
| 237 | int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) |
| 238 | { |
| 239 | int ret; |
| 240 | ret = EVP_DigestFinal_ex(ctx, md, size); |
| 241 | EVP_MD_CTX_cleanup(ctx); |
| 242 | return ret; |
| 243 | } |
| 244 | |
| 245 | /* The caller can assume that this removes any secret data from the context */ |
| 246 | int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) |
| 247 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 248 | int ret; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 249 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 250 | OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); |
| 251 | ret=ctx->digest->final(ctx,md); |
| 252 | if (size != NULL) |
| 253 | *size=ctx->digest->md_size; |
| 254 | if (ctx->digest->cleanup) |
| 255 | { |
| 256 | ctx->digest->cleanup(ctx); |
| 257 | EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED); |
| 258 | } |
| 259 | memset(ctx->md_data,0,ctx->digest->ctx_size); |
| 260 | return ret; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) |
| 264 | { |
| 265 | EVP_MD_CTX_init(out); |
| 266 | return EVP_MD_CTX_copy_ex(out, in); |
| 267 | } |
| 268 | |
| 269 | int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) |
| 270 | { |
| 271 | unsigned char *tmp_buf; |
| 272 | if ((in == NULL) || (in->digest == NULL)) |
| 273 | { |
| 274 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED); |
| 275 | return 0; |
| 276 | } |
| 277 | #ifndef OPENSSL_NO_ENGINE |
| 278 | /* Make sure it's safe to copy a digest context using an ENGINE */ |
| 279 | if (in->engine && !ENGINE_init(in->engine)) |
| 280 | { |
| 281 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB); |
| 282 | return 0; |
| 283 | } |
| 284 | #endif |
| 285 | |
| 286 | if (out->digest == in->digest) |
| 287 | { |
| 288 | tmp_buf = out->md_data; |
| 289 | EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE); |
| 290 | } |
| 291 | else tmp_buf = NULL; |
| 292 | EVP_MD_CTX_cleanup(out); |
| 293 | memcpy(out,in,sizeof *out); |
| 294 | |
| 295 | if (in->md_data && out->digest->ctx_size) |
| 296 | { |
| 297 | if (tmp_buf) |
| 298 | out->md_data = tmp_buf; |
| 299 | else |
| 300 | { |
| 301 | out->md_data=OPENSSL_malloc(out->digest->ctx_size); |
| 302 | if (!out->md_data) |
| 303 | { |
| 304 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_MALLOC_FAILURE); |
| 305 | return 0; |
| 306 | } |
| 307 | } |
| 308 | memcpy(out->md_data,in->md_data,out->digest->ctx_size); |
| 309 | } |
| 310 | |
| 311 | out->update = in->update; |
| 312 | |
| 313 | if (in->pctx) |
| 314 | { |
| 315 | out->pctx = EVP_PKEY_CTX_dup(in->pctx); |
| 316 | if (!out->pctx) |
| 317 | { |
| 318 | EVP_MD_CTX_cleanup(out); |
| 319 | return 0; |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | if (out->digest->copy) |
| 324 | return out->digest->copy(out,in); |
| 325 | |
| 326 | return 1; |
| 327 | } |
| 328 | |
| 329 | int EVP_Digest(const void *data, size_t count, |
| 330 | unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl) |
| 331 | { |
| 332 | EVP_MD_CTX ctx; |
| 333 | int ret; |
| 334 | |
| 335 | EVP_MD_CTX_init(&ctx); |
| 336 | EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT); |
| 337 | ret=EVP_DigestInit_ex(&ctx, type, impl) |
| 338 | && EVP_DigestUpdate(&ctx, data, count) |
| 339 | && EVP_DigestFinal_ex(&ctx, md, size); |
| 340 | EVP_MD_CTX_cleanup(&ctx); |
| 341 | |
| 342 | return ret; |
| 343 | } |
| 344 | |
| 345 | void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) |
| 346 | { |
| 347 | EVP_MD_CTX_cleanup(ctx); |
| 348 | OPENSSL_free(ctx); |
| 349 | } |
| 350 | |
| 351 | /* This call frees resources associated with the context */ |
| 352 | int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) |
| 353 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 354 | /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, |
| 355 | * because sometimes only copies of the context are ever finalised. |
| 356 | */ |
| 357 | if (ctx->digest && ctx->digest->cleanup |
| 358 | && !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED)) |
| 359 | ctx->digest->cleanup(ctx); |
| 360 | if (ctx->digest && ctx->digest->ctx_size && ctx->md_data |
| 361 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) |
| 362 | { |
| 363 | OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size); |
| 364 | OPENSSL_free(ctx->md_data); |
| 365 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 366 | if (ctx->pctx) |
| 367 | EVP_PKEY_CTX_free(ctx->pctx); |
| 368 | #ifndef OPENSSL_NO_ENGINE |
| 369 | if(ctx->engine) |
| 370 | /* The EVP_MD we used belongs to an ENGINE, release the |
| 371 | * functional reference we held for this reason. */ |
| 372 | ENGINE_finish(ctx->engine); |
| 373 | #endif |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 374 | memset(ctx,'\0',sizeof *ctx); |
| 375 | |
| 376 | return 1; |
| 377 | } |