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
120 #ifdef OPENSSL_FIPS
121 #include <openssl/fips.h>
122 #endif
123
124 void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
125 {
126 memset(ctx,'\0',sizeof *ctx);
127 }
128
129 EVP_MD_CTX *EVP_MD_CTX_create(void)
130 {
131 EVP_MD_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
132
133 if (ctx)
134 EVP_MD_CTX_init(ctx);
135
136 return ctx;
137 }
138
139 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
140 {
141 EVP_MD_CTX_init(ctx);
142 return EVP_DigestInit_ex(ctx, type, NULL);
143 }
144
145 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
146 {
147 EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
148 #ifndef OPENSSL_NO_ENGINE
149 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
150 * so this context may already have an ENGINE! Try to avoid releasing
151 * the previous handle, re-querying for an ENGINE, and having a
152 * reinitialisation, when it may all be unecessary. */
153 if (ctx->engine && ctx->digest && (!type ||
154 (type && (type->type == ctx->digest->type))))
155 goto skip_to_init;
156 if (type)
157 {
158 /* Ensure an ENGINE left lying around from last time is cleared
159 * (the previous check attempted to avoid this if the same
160 * ENGINE and EVP_MD could be used). */
161 if(ctx->engine)
162 ENGINE_finish(ctx->engine);
163 if(impl)
164 {
165 if (!ENGINE_init(impl))
166 {
167 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);
168 return 0;
169 }
170 }
171 else
172 /* Ask if an ENGINE is reserved for this job */
173 impl = ENGINE_get_digest_engine(type->type);
174 if(impl)
175 {
176 /* There's an ENGINE for this job ... (apparently) */
177 const EVP_MD *d = ENGINE_get_digest(impl, type->type);
178 if(!d)
179 {
180 /* Same comment from evp_enc.c */
181 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);
182 ENGINE_finish(impl);
183 return 0;
184 }
185 /* We'll use the ENGINE's private digest definition */
186 type = d;
187 /* Store the ENGINE functional reference so we know
188 * 'type' came from an ENGINE and we need to release
189 * it when done. */
190 ctx->engine = impl;
191 }
192 else
193 ctx->engine = NULL;
194 }
195 else
196 if(!ctx->digest)
197 {
198 EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_NO_DIGEST_SET);
199 return 0;
200 }
201 #endif
202 if (ctx->digest != type)
203 {
204 if (ctx->digest && ctx->digest->ctx_size)
205 OPENSSL_free(ctx->md_data);
206 ctx->digest=type;
207 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size)
208 {
209 ctx->update = type->update;
210 ctx->md_data=OPENSSL_malloc(type->ctx_size);
211 if (ctx->md_data == NULL)
212 {
213 EVPerr(EVP_F_EVP_DIGESTINIT_EX,
214 ERR_R_MALLOC_FAILURE);
215 return 0;
216 }
217 }
218 }
219 #ifndef OPENSSL_NO_ENGINE
220 skip_to_init:
221 #endif
222 if (ctx->pctx)
223 {
224 int r;
225 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
226 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
227 if (r <= 0 && (r != -2))
228 return 0;
229 }
230 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
231 return 1;
232 #ifdef OPENSSL_FIPS
233 if (FIPS_mode())
234 {
235 if (FIPS_digestinit(ctx, type))
236 return 1;
237 OPENSSL_free(ctx->md_data);
238 ctx->md_data = NULL;
239 return 0;
240 }
241 #endif
242 return ctx->digest->init(ctx);
243 }
244
245 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
246 {
247 #ifdef OPENSSL_FIPS
248 return FIPS_digestupdate(ctx, data, count);
249 #else
250 return ctx->update(ctx,data,count);
251 #endif
252 }
253
254 /* The caller can assume that this removes any secret data from the context */
255 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
256 {
257 int ret;
258 ret = EVP_DigestFinal_ex(ctx, md, size);
259 EVP_MD_CTX_cleanup(ctx);
260 return ret;
261 }
262
263 /* The caller can assume that this removes any secret data from the context */
264 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
265 {
266 #ifdef OPENSSL_FIPS
267 return FIPS_digestfinal(ctx, md, size);
268 #else
269 int ret;
270
271 OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
272 ret=ctx->digest->final(ctx,md);
273 if (size != NULL)
274 *size=ctx->digest->md_size;
275 if (ctx->digest->cleanup)
276 {
277 ctx->digest->cleanup(ctx);
278 EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
279 }
280 memset(ctx->md_data,0,ctx->digest->ctx_size);
281 return ret;
282 #endif
283 }
284
285 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
286 {
287 EVP_MD_CTX_init(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 {
296 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED);
297 return 0;
298 }
299 #ifndef OPENSSL_NO_ENGINE
300 /* Make sure it's safe to copy a digest context using an ENGINE */
301 if (in->engine && !ENGINE_init(in->engine))
302 {
303 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB);
304 return 0;
305 }
306 #endif
307
308 if (out->digest == in->digest)
309 {
310 tmp_buf = out->md_data;
311 EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE);
312 }
313 else tmp_buf = NULL;
314 EVP_MD_CTX_cleanup(out);
315 memcpy(out,in,sizeof *out);
316
317 if (in->md_data && out->digest->ctx_size)
318 {
319 if (tmp_buf)
320 out->md_data = tmp_buf;
321 else
322 {
323 out->md_data=OPENSSL_malloc(out->digest->ctx_size);
324 if (!out->md_data)
325 {
326 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_MALLOC_FAILURE);
327 return 0;
328 }
329 }
330 memcpy(out->md_data,in->md_data,out->digest->ctx_size);
331 }
332
333 out->update = in->update;
334
335 if (in->pctx)
336 {
337 out->pctx = EVP_PKEY_CTX_dup(in->pctx);
338 if (!out->pctx)
339 {
340 EVP_MD_CTX_cleanup(out);
341 return 0;
342 }
343 }
344
345 if (out->digest->copy)
346 return out->digest->copy(out,in);
347
348 return 1;
349 }
350
351 int EVP_Digest(const void *data, size_t count,
352 unsigned char *md, unsigned int *size, const EVP_MD *type, 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 }
366
367 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
368 {
369 if (ctx)
370 {
371 EVP_MD_CTX_cleanup(ctx);
372 OPENSSL_free(ctx);
373 }
374 }
375
376 /* This call frees resources associated with the context */
377 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
378 {
379 #ifndef OPENSSL_FIPS
380 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final,
381 * because 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 {
389 OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size);
390 OPENSSL_free(ctx->md_data);
391 }
392 #endif
393 if (ctx->pctx)
394 EVP_PKEY_CTX_free(ctx->pctx);
395 #ifndef OPENSSL_NO_ENGINE
396 if(ctx->engine)
397 /* The EVP_MD we used belongs to an ENGINE, release the
398 * functional reference we held for this reason. */
399 ENGINE_finish(ctx->engine);
400 #endif
401 #ifdef OPENSSL_FIPS
402 FIPS_md_ctx_cleanup(ctx);
403 #endif
404 memset(ctx,'\0',sizeof *ctx);
405
406 return 1;
407 }