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d02b48c6 | 1 | /* crypto/evp/digest.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
0f113f3e | 8 | * |
d02b48c6 RE |
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). | |
0f113f3e | 15 | * |
d02b48c6 RE |
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. | |
0f113f3e | 22 | * |
d02b48c6 RE |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 RE |
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. | |
0f113f3e | 52 | * |
d02b48c6 RE |
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 | */ | |
5ba372b1 BM |
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 | |
0f113f3e | 66 | * notice, this list of conditions and the following disclaimer. |
5ba372b1 BM |
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 | */ | |
d02b48c6 RE |
111 | |
112 | #include <stdio.h> | |
113 | #include "cryptlib.h" | |
ec577822 BM |
114 | #include <openssl/objects.h> |
115 | #include <openssl/evp.h> | |
0b13e9f0 | 116 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 117 | # include <openssl/engine.h> |
0b13e9f0 | 118 | #endif |
d02b48c6 | 119 | |
dbad1690 | 120 | void EVP_MD_CTX_init(EVP_MD_CTX *ctx) |
0f113f3e MC |
121 | { |
122 | memset(ctx, '\0', sizeof *ctx); | |
123 | } | |
dbad1690 BL |
124 | |
125 | EVP_MD_CTX *EVP_MD_CTX_create(void) | |
0f113f3e MC |
126 | { |
127 | EVP_MD_CTX *ctx = OPENSSL_malloc(sizeof *ctx); | |
dbad1690 | 128 | |
0f113f3e MC |
129 | if (ctx) |
130 | EVP_MD_CTX_init(ctx); | |
dbad1690 | 131 | |
0f113f3e MC |
132 | return ctx; |
133 | } | |
dbad1690 | 134 | |
2dc769a1 | 135 | int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) |
0f113f3e MC |
136 | { |
137 | EVP_MD_CTX_init(ctx); | |
138 | return EVP_DigestInit_ex(ctx, type, NULL); | |
139 | } | |
0fea7ed4 | 140 | |
11a57c7b | 141 | int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) |
0f113f3e MC |
142 | { |
143 | EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); | |
0b13e9f0 | 144 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
145 | /* |
146 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so | |
147 | * this context may already have an ENGINE! Try to avoid releasing the | |
148 | * previous handle, re-querying for an ENGINE, and having a | |
149 | * reinitialisation, when it may all be unecessary. | |
150 | */ | |
151 | if (ctx->engine && ctx->digest && (!type || | |
152 | (type | |
153 | && (type->type == | |
154 | ctx->digest->type)))) | |
155 | goto skip_to_init; | |
156 | if (type) { | |
157 | /* | |
158 | * Ensure an ENGINE left lying around from last time is cleared (the | |
159 | * previous check attempted to avoid this if the same ENGINE and | |
160 | * EVP_MD could be used). | |
161 | */ | |
162 | if (ctx->engine) | |
163 | ENGINE_finish(ctx->engine); | |
164 | if (impl) { | |
165 | if (!ENGINE_init(impl)) { | |
166 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, 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, 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 | /* | |
184 | * Store the ENGINE functional reference so we know 'type' came | |
185 | * from an ENGINE and we need to release it when done. | |
186 | */ | |
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 | } | |
90e8a310 | 194 | #endif |
0f113f3e MC |
195 | if (ctx->digest != type) { |
196 | if (ctx->digest && ctx->digest->ctx_size) | |
197 | OPENSSL_free(ctx->md_data); | |
198 | ctx->digest = type; | |
199 | if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { | |
200 | ctx->update = type->update; | |
201 | ctx->md_data = OPENSSL_malloc(type->ctx_size); | |
202 | if (ctx->md_data == NULL) { | |
203 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE); | |
204 | return 0; | |
205 | } | |
206 | } | |
207 | } | |
0b13e9f0 | 208 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 209 | skip_to_init: |
0b13e9f0 | 210 | #endif |
0f113f3e MC |
211 | if (ctx->pctx) { |
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 | } | |
d02b48c6 | 222 | |
f80921b6 | 223 | int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) |
0f113f3e MC |
224 | { |
225 | return ctx->update(ctx, data, count); | |
226 | } | |
d02b48c6 | 227 | |
dbad1690 | 228 | /* The caller can assume that this removes any secret data from the context */ |
2dc769a1 | 229 | int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) |
0f113f3e MC |
230 | { |
231 | int ret; | |
232 | ret = EVP_DigestFinal_ex(ctx, md, size); | |
233 | EVP_MD_CTX_cleanup(ctx); | |
234 | return ret; | |
235 | } | |
20d2186c DSH |
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) | |
0f113f3e MC |
239 | { |
240 | int ret; | |
54a656ef | 241 | |
0f113f3e MC |
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 | ctx->digest->cleanup(ctx); | |
248 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); | |
249 | } | |
250 | memset(ctx->md_data, 0, ctx->digest->ctx_size); | |
251 | return ret; | |
252 | } | |
351d8998 | 253 | |
dbad1690 | 254 | int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) |
0f113f3e MC |
255 | { |
256 | EVP_MD_CTX_init(out); | |
257 | return EVP_MD_CTX_copy_ex(out, in); | |
258 | } | |
20d2186c DSH |
259 | |
260 | int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) | |
0f113f3e MC |
261 | { |
262 | unsigned char *tmp_buf; | |
263 | if ((in == NULL) || (in->digest == NULL)) { | |
264 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED); | |
265 | return 0; | |
266 | } | |
0b13e9f0 | 267 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
268 | /* Make sure it's safe to copy a digest context using an ENGINE */ |
269 | if (in->engine && !ENGINE_init(in->engine)) { | |
270 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB); | |
271 | return 0; | |
272 | } | |
0b13e9f0 | 273 | #endif |
26188931 | 274 | |
0f113f3e MC |
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 = OPENSSL_malloc(out->digest->ctx_size); | |
288 | if (!out->md_data) { | |
289 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE); | |
290 | return 0; | |
291 | } | |
292 | } | |
293 | memcpy(out->md_data, in->md_data, out->digest->ctx_size); | |
294 | } | |
26188931 | 295 | |
0f113f3e | 296 | out->update = in->update; |
d4575825 | 297 | |
0f113f3e MC |
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 | } | |
18327cd0 | 305 | |
0f113f3e MC |
306 | if (out->digest->copy) |
307 | return out->digest->copy(out, in); | |
3a828611 | 308 | |
0f113f3e MC |
309 | return 1; |
310 | } | |
88ce56f8 | 311 | |
9e0aad9f | 312 | int EVP_Digest(const void *data, size_t count, |
0f113f3e MC |
313 | unsigned char *md, unsigned int *size, const EVP_MD *type, |
314 | ENGINE *impl) | |
315 | { | |
316 | EVP_MD_CTX ctx; | |
317 | int ret; | |
dbad1690 | 318 | |
0f113f3e MC |
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); | |
dbad1690 | 325 | |
0f113f3e MC |
326 | return ret; |
327 | } | |
dbad1690 BL |
328 | |
329 | void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) | |
0f113f3e MC |
330 | { |
331 | if (ctx) { | |
332 | EVP_MD_CTX_cleanup(ctx); | |
333 | OPENSSL_free(ctx); | |
334 | } | |
335 | } | |
dbad1690 BL |
336 | |
337 | /* This call frees resources associated with the context */ | |
338 | int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) | |
0f113f3e MC |
339 | { |
340 | /* | |
341 | * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because | |
342 | * sometimes only copies of the context are ever finalised. | |
343 | */ | |
344 | if (ctx->digest && ctx->digest->cleanup | |
345 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED)) | |
346 | ctx->digest->cleanup(ctx); | |
347 | if (ctx->digest && ctx->digest->ctx_size && ctx->md_data | |
348 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) { | |
349 | OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size); | |
350 | OPENSSL_free(ctx->md_data); | |
351 | } | |
352 | if (ctx->pctx) | |
353 | EVP_PKEY_CTX_free(ctx->pctx); | |
0b13e9f0 | 354 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
355 | if (ctx->engine) |
356 | /* | |
357 | * The EVP_MD we used belongs to an ENGINE, release the functional | |
358 | * reference we held for this reason. | |
359 | */ | |
360 | ENGINE_finish(ctx->engine); | |
0b13e9f0 | 361 | #endif |
0f113f3e | 362 | memset(ctx, '\0', sizeof *ctx); |
dbad1690 | 363 | |
0f113f3e MC |
364 | return 1; |
365 | } |