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1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
2 | * All rights reserved. | |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
7 | * | |
8 | * This library is free for commercial and non-commercial use as long as | |
9 | * the following conditions are aheared to. The following conditions | |
10 | * apply to all code found in this distribution, be it the RC4, RSA, | |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
14 | * | |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
21 | * | |
22 | * Redistribution and use in source and binary forms, with or without | |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
34 | * The word 'cryptographic' can be left out if the rouines from the library | |
35 | * being used are not cryptographic related :-). | |
36 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
37 | * the apps directory (application code) you must include an acknowledgement: | |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
51 | * | |
52 | * The licence and distribution terms for any publically available version or | |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
57 | /* ==================================================================== | |
58 | * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. | |
59 | * | |
60 | * Redistribution and use in source and binary forms, with or without | |
61 | * modification, are permitted provided that the following conditions | |
62 | * are met: | |
63 | * | |
64 | * 1. Redistributions of source code must retain the above copyright | |
65 | * notice, this list of conditions and the following disclaimer. | |
66 | * | |
67 | * 2. Redistributions in binary form must reproduce the above copyright | |
68 | * notice, this list of conditions and the following disclaimer in | |
69 | * the documentation and/or other materials provided with the | |
70 | * distribution. | |
71 | * | |
72 | * 3. All advertising materials mentioning features or use of this | |
73 | * software must display the following acknowledgment: | |
74 | * "This product includes software developed by the OpenSSL Project | |
75 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
76 | * | |
77 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
78 | * endorse or promote products derived from this software without | |
79 | * prior written permission. For written permission, please contact | |
80 | * openssl-core@openssl.org. | |
81 | * | |
82 | * 5. Products derived from this software may not be called "OpenSSL" | |
83 | * nor may "OpenSSL" appear in their names without prior written | |
84 | * permission of the OpenSSL Project. | |
85 | * | |
86 | * 6. Redistributions of any form whatsoever must retain the following | |
87 | * acknowledgment: | |
88 | * "This product includes software developed by the OpenSSL Project | |
89 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
90 | * | |
91 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
92 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
93 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
94 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
95 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
96 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
97 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
98 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
99 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
100 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
101 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
102 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
103 | * ==================================================================== | |
104 | * | |
105 | * This product includes cryptographic software written by Eric Young | |
106 | * (eay@cryptsoft.com). This product includes software written by Tim | |
107 | * Hudson (tjh@cryptsoft.com). | |
108 | * | |
109 | */ | |
110 | ||
111 | #include <stdio.h> | |
112 | #include "internal/cryptlib.h" | |
113 | #include <openssl/objects.h> | |
114 | #include <openssl/evp.h> | |
115 | #ifndef OPENSSL_NO_ENGINE | |
116 | # include <openssl/engine.h> | |
117 | #endif | |
118 | #include "internal/evp_int.h" | |
119 | #include "evp_locl.h" | |
120 | ||
121 | /* This call frees resources associated with the context */ | |
122 | int EVP_MD_CTX_reset(EVP_MD_CTX *ctx) | |
123 | { | |
124 | if (ctx == NULL) | |
125 | return 1; | |
126 | ||
127 | /* | |
128 | * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because | |
129 | * sometimes only copies of the context are ever finalised. | |
130 | */ | |
131 | if (ctx->digest && ctx->digest->cleanup | |
132 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED)) | |
133 | ctx->digest->cleanup(ctx); | |
134 | if (ctx->digest && ctx->digest->ctx_size && ctx->md_data | |
135 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) { | |
136 | OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size); | |
137 | } | |
138 | EVP_PKEY_CTX_free(ctx->pctx); | |
139 | #ifndef OPENSSL_NO_ENGINE | |
140 | if (ctx->engine) | |
141 | /* | |
142 | * The EVP_MD we used belongs to an ENGINE, release the functional | |
143 | * reference we held for this reason. | |
144 | */ | |
145 | ENGINE_finish(ctx->engine); | |
146 | #endif | |
147 | memset(ctx, 0, sizeof(*ctx)); | |
148 | ||
149 | return 1; | |
150 | } | |
151 | ||
152 | EVP_MD_CTX *EVP_MD_CTX_new(void) | |
153 | { | |
154 | return OPENSSL_zalloc(sizeof(EVP_MD_CTX)); | |
155 | } | |
156 | ||
157 | void EVP_MD_CTX_free(EVP_MD_CTX *ctx) | |
158 | { | |
159 | EVP_MD_CTX_reset(ctx); | |
160 | OPENSSL_free(ctx); | |
161 | } | |
162 | ||
163 | int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) | |
164 | { | |
165 | EVP_MD_CTX_reset(ctx); | |
166 | return EVP_DigestInit_ex(ctx, type, NULL); | |
167 | } | |
168 | ||
169 | int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) | |
170 | { | |
171 | EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); | |
172 | #ifndef OPENSSL_NO_ENGINE | |
173 | /* | |
174 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so | |
175 | * this context may already have an ENGINE! Try to avoid releasing the | |
176 | * previous handle, re-querying for an ENGINE, and having a | |
177 | * reinitialisation, when it may all be unecessary. | |
178 | */ | |
179 | if (ctx->engine && ctx->digest && (!type || | |
180 | (type | |
181 | && (type->type == | |
182 | ctx->digest->type)))) | |
183 | goto skip_to_init; | |
184 | if (type) { | |
185 | /* | |
186 | * Ensure an ENGINE left lying around from last time is cleared (the | |
187 | * previous check attempted to avoid this if the same ENGINE and | |
188 | * EVP_MD could be used). | |
189 | */ | |
190 | if (ctx->engine) | |
191 | ENGINE_finish(ctx->engine); | |
192 | if (impl) { | |
193 | if (!ENGINE_init(impl)) { | |
194 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
195 | return 0; | |
196 | } | |
197 | } else | |
198 | /* Ask if an ENGINE is reserved for this job */ | |
199 | impl = ENGINE_get_digest_engine(type->type); | |
200 | if (impl) { | |
201 | /* There's an ENGINE for this job ... (apparently) */ | |
202 | const EVP_MD *d = ENGINE_get_digest(impl, type->type); | |
203 | if (!d) { | |
204 | /* Same comment from evp_enc.c */ | |
205 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
206 | ENGINE_finish(impl); | |
207 | return 0; | |
208 | } | |
209 | /* We'll use the ENGINE's private digest definition */ | |
210 | type = d; | |
211 | /* | |
212 | * Store the ENGINE functional reference so we know 'type' came | |
213 | * from an ENGINE and we need to release it when done. | |
214 | */ | |
215 | ctx->engine = impl; | |
216 | } else | |
217 | ctx->engine = NULL; | |
218 | } else { | |
219 | if (!ctx->digest) { | |
220 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET); | |
221 | return 0; | |
222 | } | |
223 | type = ctx->digest; | |
224 | } | |
225 | #endif | |
226 | if (ctx->digest != type) { | |
227 | if (ctx->digest && ctx->digest->ctx_size) | |
228 | OPENSSL_free(ctx->md_data); | |
229 | ctx->digest = type; | |
230 | if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { | |
231 | ctx->update = type->update; | |
232 | ctx->md_data = OPENSSL_malloc(type->ctx_size); | |
233 | if (ctx->md_data == NULL) { | |
234 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE); | |
235 | return 0; | |
236 | } | |
237 | } | |
238 | } | |
239 | #ifndef OPENSSL_NO_ENGINE | |
240 | skip_to_init: | |
241 | #endif | |
242 | if (ctx->pctx) { | |
243 | int r; | |
244 | r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, | |
245 | EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); | |
246 | if (r <= 0 && (r != -2)) | |
247 | return 0; | |
248 | } | |
249 | if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) | |
250 | return 1; | |
251 | return ctx->digest->init(ctx); | |
252 | } | |
253 | ||
254 | int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) | |
255 | { | |
256 | return ctx->update(ctx, data, count); | |
257 | } | |
258 | ||
259 | /* The caller can assume that this removes any secret data from the context */ | |
260 | int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) | |
261 | { | |
262 | int ret; | |
263 | ret = EVP_DigestFinal_ex(ctx, md, size); | |
264 | EVP_MD_CTX_reset(ctx); | |
265 | return ret; | |
266 | } | |
267 | ||
268 | /* The caller can assume that this removes any secret data from the context */ | |
269 | int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) | |
270 | { | |
271 | int ret; | |
272 | ||
273 | OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); | |
274 | ret = ctx->digest->final(ctx, md); | |
275 | if (size != NULL) | |
276 | *size = ctx->digest->md_size; | |
277 | if (ctx->digest->cleanup) { | |
278 | ctx->digest->cleanup(ctx); | |
279 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); | |
280 | } | |
281 | memset(ctx->md_data, 0, ctx->digest->ctx_size); | |
282 | return ret; | |
283 | } | |
284 | ||
285 | int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) | |
286 | { | |
287 | EVP_MD_CTX_reset(out); | |
288 | return EVP_MD_CTX_copy_ex(out, in); | |
289 | } | |
290 | ||
291 | int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) | |
292 | { | |
293 | unsigned char *tmp_buf; | |
294 | if ((in == NULL) || (in->digest == NULL)) { | |
295 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED); | |
296 | return 0; | |
297 | } | |
298 | #ifndef OPENSSL_NO_ENGINE | |
299 | /* Make sure it's safe to copy a digest context using an ENGINE */ | |
300 | if (in->engine && !ENGINE_init(in->engine)) { | |
301 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB); | |
302 | return 0; | |
303 | } | |
304 | #endif | |
305 | ||
306 | if (out->digest == in->digest) { | |
307 | tmp_buf = out->md_data; | |
308 | EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE); | |
309 | } else | |
310 | tmp_buf = NULL; | |
311 | EVP_MD_CTX_reset(out); | |
312 | memcpy(out, in, sizeof(*out)); | |
313 | ||
314 | /* Null these variables, since they are getting fixed up | |
315 | * properly below. Anything else may cause a memleak and/or | |
316 | * double free if any of the memory allocations below fail | |
317 | */ | |
318 | out->md_data = NULL; | |
319 | out->pctx = NULL; | |
320 | ||
321 | if (in->md_data && out->digest->ctx_size) { | |
322 | if (tmp_buf) | |
323 | out->md_data = tmp_buf; | |
324 | else { | |
325 | out->md_data = OPENSSL_malloc(out->digest->ctx_size); | |
326 | if (out->md_data == NULL) { | |
327 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE); | |
328 | return 0; | |
329 | } | |
330 | } | |
331 | memcpy(out->md_data, in->md_data, out->digest->ctx_size); | |
332 | } | |
333 | ||
334 | out->update = in->update; | |
335 | ||
336 | if (in->pctx) { | |
337 | out->pctx = EVP_PKEY_CTX_dup(in->pctx); | |
338 | if (!out->pctx) { | |
339 | EVP_MD_CTX_reset(out); | |
340 | return 0; | |
341 | } | |
342 | } | |
343 | ||
344 | if (out->digest->copy) | |
345 | return out->digest->copy(out, in); | |
346 | ||
347 | return 1; | |
348 | } | |
349 | ||
350 | int EVP_Digest(const void *data, size_t count, | |
351 | unsigned char *md, unsigned int *size, const EVP_MD *type, | |
352 | ENGINE *impl) | |
353 | { | |
354 | EVP_MD_CTX *ctx = EVP_MD_CTX_new(); | |
355 | int ret; | |
356 | ||
357 | if (ctx == NULL) | |
358 | return 0; | |
359 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT); | |
360 | ret = EVP_DigestInit_ex(ctx, type, impl) | |
361 | && EVP_DigestUpdate(ctx, data, count) | |
362 | && EVP_DigestFinal_ex(ctx, md, size); | |
363 | EVP_MD_CTX_free(ctx); | |
364 | ||
365 | return ret; | |
366 | } | |
367 | ||
368 | int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2) | |
369 | { | |
370 | if (ctx->digest && ctx->digest->md_ctrl) { | |
371 | int ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2); | |
372 | if (ret <= 0) | |
373 | return 0; | |
374 | return 1; | |
375 | } | |
376 | return 0; | |
377 | } |