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3e575651 SL |
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. | |
d3819813 | 8 | * |
3e575651 SL |
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). | |
d3819813 | 15 | * |
3e575651 SL |
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. | |
d3819813 | 22 | * |
3e575651 SL |
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 :-). | |
d3819813 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
3e575651 SL |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
d3819813 | 40 | * |
3e575651 SL |
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. | |
d3819813 | 52 | * |
3e575651 SL |
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 | |
d3819813 | 66 | * notice, this list of conditions and the following disclaimer. |
3e575651 SL |
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 | |
d3819813 MTL |
117 | # include <openssl/engine.h> |
118 | #endif | |
119 | ||
120 | #ifdef OPENSSL_FIPS | |
121 | # include <openssl/fips.h> | |
122 | # include "evp_locl.h" | |
3e575651 | 123 | #endif |
3e575651 SL |
124 | |
125 | void EVP_MD_CTX_init(EVP_MD_CTX *ctx) | |
d3819813 MTL |
126 | { |
127 | memset(ctx, '\0', sizeof *ctx); | |
128 | } | |
3e575651 SL |
129 | |
130 | EVP_MD_CTX *EVP_MD_CTX_create(void) | |
d3819813 MTL |
131 | { |
132 | EVP_MD_CTX *ctx = OPENSSL_malloc(sizeof *ctx); | |
3e575651 | 133 | |
d3819813 MTL |
134 | if (ctx) |
135 | EVP_MD_CTX_init(ctx); | |
3e575651 | 136 | |
d3819813 MTL |
137 | return ctx; |
138 | } | |
3e575651 SL |
139 | |
140 | int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) | |
d3819813 MTL |
141 | { |
142 | EVP_MD_CTX_init(ctx); | |
143 | return EVP_DigestInit_ex(ctx, type, NULL); | |
144 | } | |
3e575651 | 145 | |
d3819813 MTL |
146 | int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) |
147 | { | |
148 | EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); | |
3e575651 | 149 | #ifdef OPENSSL_FIPS |
d3819813 MTL |
150 | /* If FIPS mode switch to approved implementation if possible */ |
151 | if (FIPS_mode()) { | |
152 | const EVP_MD *fipsmd; | |
153 | if (type) { | |
154 | fipsmd = evp_get_fips_md(type); | |
155 | if (fipsmd) | |
156 | type = fipsmd; | |
157 | } | |
158 | } | |
3e575651 | 159 | #endif |
3e575651 | 160 | #ifndef OPENSSL_NO_ENGINE |
d3819813 MTL |
161 | /* |
162 | * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so | |
163 | * this context may already have an ENGINE! Try to avoid releasing the | |
164 | * previous handle, re-querying for an ENGINE, and having a | |
165 | * reinitialisation, when it may all be unecessary. | |
166 | */ | |
167 | if (ctx->engine && ctx->digest && (!type || | |
168 | (type | |
169 | && (type->type == | |
170 | ctx->digest->type)))) | |
171 | goto skip_to_init; | |
172 | if (type) { | |
173 | /* | |
174 | * Ensure an ENGINE left lying around from last time is cleared (the | |
175 | * previous check attempted to avoid this if the same ENGINE and | |
176 | * EVP_MD could be used). | |
177 | */ | |
178 | if (ctx->engine) | |
179 | ENGINE_finish(ctx->engine); | |
180 | if (impl) { | |
181 | if (!ENGINE_init(impl)) { | |
182 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
183 | return 0; | |
184 | } | |
185 | } else | |
186 | /* Ask if an ENGINE is reserved for this job */ | |
187 | impl = ENGINE_get_digest_engine(type->type); | |
188 | if (impl) { | |
189 | /* There's an ENGINE for this job ... (apparently) */ | |
190 | const EVP_MD *d = ENGINE_get_digest(impl, type->type); | |
191 | if (!d) { | |
192 | /* Same comment from evp_enc.c */ | |
193 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR); | |
194 | ENGINE_finish(impl); | |
195 | return 0; | |
196 | } | |
197 | /* We'll use the ENGINE's private digest definition */ | |
198 | type = d; | |
199 | /* | |
200 | * Store the ENGINE functional reference so we know 'type' came | |
201 | * from an ENGINE and we need to release it when done. | |
202 | */ | |
203 | ctx->engine = impl; | |
204 | } else | |
205 | ctx->engine = NULL; | |
206 | } else { | |
207 | if (!ctx->digest) { | |
208 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET); | |
209 | return 0; | |
210 | } | |
211 | type = ctx->digest; | |
212 | } | |
3e575651 | 213 | #endif |
d3819813 | 214 | if (ctx->digest != type) { |
62f0afa2 | 215 | if (ctx->digest && ctx->digest->ctx_size) { |
d3819813 | 216 | OPENSSL_free(ctx->md_data); |
62f0afa2 MTL |
217 | ctx->md_data = NULL; |
218 | } | |
d3819813 MTL |
219 | ctx->digest = type; |
220 | if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { | |
221 | ctx->update = type->update; | |
222 | ctx->md_data = OPENSSL_malloc(type->ctx_size); | |
223 | if (ctx->md_data == NULL) { | |
224 | EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE); | |
225 | return 0; | |
226 | } | |
227 | } | |
228 | } | |
3e575651 | 229 | #ifndef OPENSSL_NO_ENGINE |
d3819813 | 230 | skip_to_init: |
3e575651 | 231 | #endif |
d3819813 MTL |
232 | if (ctx->pctx) { |
233 | int r; | |
234 | r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, | |
235 | EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); | |
236 | if (r <= 0 && (r != -2)) | |
237 | return 0; | |
238 | } | |
239 | if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) | |
240 | return 1; | |
3e575651 | 241 | #ifdef OPENSSL_FIPS |
d3819813 MTL |
242 | if (FIPS_mode()) { |
243 | if (FIPS_digestinit(ctx, type)) | |
244 | return 1; | |
245 | OPENSSL_free(ctx->md_data); | |
246 | ctx->md_data = NULL; | |
247 | return 0; | |
248 | } | |
3e575651 | 249 | #endif |
d3819813 MTL |
250 | return ctx->digest->init(ctx); |
251 | } | |
3e575651 | 252 | |
d3819813 MTL |
253 | int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) |
254 | { | |
3e575651 | 255 | #ifdef OPENSSL_FIPS |
d3819813 MTL |
256 | return FIPS_digestupdate(ctx, data, count); |
257 | #else | |
258 | return ctx->update(ctx, data, count); | |
3e575651 | 259 | #endif |
d3819813 | 260 | } |
3e575651 SL |
261 | |
262 | /* The caller can assume that this removes any secret data from the context */ | |
263 | int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) | |
d3819813 MTL |
264 | { |
265 | int ret; | |
266 | ret = EVP_DigestFinal_ex(ctx, md, size); | |
267 | EVP_MD_CTX_cleanup(ctx); | |
268 | return ret; | |
269 | } | |
3e575651 SL |
270 | |
271 | /* The caller can assume that this removes any secret data from the context */ | |
272 | int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) | |
d3819813 | 273 | { |
3e575651 | 274 | #ifdef OPENSSL_FIPS |
d3819813 MTL |
275 | return FIPS_digestfinal(ctx, md, size); |
276 | #else | |
277 | int ret; | |
278 | ||
279 | OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); | |
280 | ret = ctx->digest->final(ctx, md); | |
281 | if (size != NULL) | |
282 | *size = ctx->digest->md_size; | |
283 | if (ctx->digest->cleanup) { | |
284 | ctx->digest->cleanup(ctx); | |
285 | EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); | |
286 | } | |
287 | memset(ctx->md_data, 0, ctx->digest->ctx_size); | |
288 | return ret; | |
3e575651 | 289 | #endif |
d3819813 | 290 | } |
3e575651 SL |
291 | |
292 | int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) | |
d3819813 MTL |
293 | { |
294 | EVP_MD_CTX_init(out); | |
295 | return EVP_MD_CTX_copy_ex(out, in); | |
296 | } | |
3e575651 SL |
297 | |
298 | int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) | |
d3819813 MTL |
299 | { |
300 | unsigned char *tmp_buf; | |
301 | if ((in == NULL) || (in->digest == NULL)) { | |
302 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED); | |
303 | return 0; | |
304 | } | |
3e575651 | 305 | #ifndef OPENSSL_NO_ENGINE |
d3819813 MTL |
306 | /* Make sure it's safe to copy a digest context using an ENGINE */ |
307 | if (in->engine && !ENGINE_init(in->engine)) { | |
308 | EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB); | |
309 | return 0; | |
310 | } | |
3e575651 SL |
311 | #endif |
312 | ||
d3819813 MTL |
313 | if (out->digest == in->digest) { |
314 | tmp_buf = out->md_data; | |
315 | EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE); | |
316 | } else | |
317 | tmp_buf = NULL; | |
318 | EVP_MD_CTX_cleanup(out); | |
319 | memcpy(out, in, sizeof *out); | |
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) { | |
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_cleanup(out); | |
340 | return 0; | |
341 | } | |
342 | } | |
343 | ||
344 | if (out->digest->copy) | |
345 | return out->digest->copy(out, in); | |
346 | ||
347 | return 1; | |
348 | } | |
3e575651 SL |
349 | |
350 | int EVP_Digest(const void *data, size_t count, | |
d3819813 MTL |
351 | unsigned char *md, unsigned int *size, const EVP_MD *type, |
352 | ENGINE *impl) | |
353 | { | |
354 | EVP_MD_CTX ctx; | |
355 | int ret; | |
356 | ||
357 | EVP_MD_CTX_init(&ctx); | |
358 | EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT); | |
359 | ret = EVP_DigestInit_ex(&ctx, type, impl) | |
360 | && EVP_DigestUpdate(&ctx, data, count) | |
361 | && EVP_DigestFinal_ex(&ctx, md, size); | |
362 | EVP_MD_CTX_cleanup(&ctx); | |
363 | ||
364 | return ret; | |
365 | } | |
3e575651 SL |
366 | |
367 | void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) | |
d3819813 MTL |
368 | { |
369 | if (ctx) { | |
370 | EVP_MD_CTX_cleanup(ctx); | |
371 | OPENSSL_free(ctx); | |
372 | } | |
373 | } | |
3e575651 SL |
374 | |
375 | /* This call frees resources associated with the context */ | |
376 | int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) | |
d3819813 MTL |
377 | { |
378 | #ifndef OPENSSL_FIPS | |
379 | /* | |
380 | * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because | |
381 | * sometimes only copies of the context are ever finalised. | |
382 | */ | |
383 | if (ctx->digest && ctx->digest->cleanup | |
384 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED)) | |
385 | ctx->digest->cleanup(ctx); | |
386 | if (ctx->digest && ctx->digest->ctx_size && ctx->md_data | |
387 | && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) { | |
388 | OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size); | |
389 | OPENSSL_free(ctx->md_data); | |
390 | } | |
391 | #endif | |
392 | if (ctx->pctx) | |
393 | EVP_PKEY_CTX_free(ctx->pctx); | |
3e575651 | 394 | #ifndef OPENSSL_NO_ENGINE |
d3819813 MTL |
395 | if (ctx->engine) |
396 | /* | |
397 | * The EVP_MD we used belongs to an ENGINE, release the functional | |
398 | * reference we held for this reason. | |
399 | */ | |
400 | ENGINE_finish(ctx->engine); | |
401 | #endif | |
402 | #ifdef OPENSSL_FIPS | |
403 | FIPS_md_ctx_cleanup(ctx); | |
3e575651 | 404 | #endif |
d3819813 | 405 | memset(ctx, '\0', sizeof *ctx); |
3e575651 | 406 | |
d3819813 MTL |
407 | return 1; |
408 | } |