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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#include "evp_locl.h"
120
121void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
122 {
123 memset(ctx,'\0',sizeof *ctx);
124 }
125
126EVP_MD_CTX *EVP_MD_CTX_create(void)
127 {
128 EVP_MD_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
129
130 EVP_MD_CTX_init(ctx);
131
132 return ctx;
133 }
134
135int 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#ifdef OPENSSL_FIPS
142
143/* The purpose of these is to trap programs that attempt to use non FIPS
144 * algorithms in FIPS mode and ignore the errors.
145 */
146
147static int bad_init(EVP_MD_CTX *ctx)
148 { FIPS_ERROR_IGNORED("Digest init"); return 0;}
149
150static int bad_update(EVP_MD_CTX *ctx,const void *data,size_t count)
151 { FIPS_ERROR_IGNORED("Digest update"); return 0;}
152
153static int bad_final(EVP_MD_CTX *ctx,unsigned char *md)
154 { FIPS_ERROR_IGNORED("Digest Final"); return 0;}
155
156static const EVP_MD bad_md =
157 {
158 0,
159 0,
160 0,
161 0,
162 bad_init,
163 bad_update,
164 bad_final,
165 NULL,
166 NULL,
167 NULL,
168 0,
169 {0,0,0,0},
170 };
171
172#endif
173
174#ifndef OPENSSL_NO_ENGINE
175
176#ifdef OPENSSL_FIPS
177
178static int do_engine_null(ENGINE *impl) { return 0;}
179static int do_evp_md_engine_null(EVP_MD_CTX *ctx,
180 const EVP_MD **ptype, ENGINE *impl)
181 { return 1; }
182
183static int (*do_engine_init)(ENGINE *impl)
184 = do_engine_null;
185
186static int (*do_engine_finish)(ENGINE *impl)
187 = do_engine_null;
188
189static int (*do_evp_md_engine)
190 (EVP_MD_CTX *ctx, const EVP_MD **ptype, ENGINE *impl)
191 = do_evp_md_engine_null;
192
193void int_EVP_MD_set_engine_callbacks(
194 int (*eng_md_init)(ENGINE *impl),
195 int (*eng_md_fin)(ENGINE *impl),
196 int (*eng_md_evp)
197 (EVP_MD_CTX *ctx, const EVP_MD **ptype, ENGINE *impl))
198 {
199 do_engine_init = eng_md_init;
200 do_engine_finish = eng_md_fin;
201 do_evp_md_engine = eng_md_evp;
202 }
203
204#else
205
206#define do_engine_init ENGINE_init
207#define do_engine_finish ENGINE_finish
208
209static int do_evp_md_engine(EVP_MD_CTX *ctx, const EVP_MD **ptype, ENGINE *impl)
210 {
211 if (*ptype)
212 {
213 /* Ensure an ENGINE left lying around from last time is cleared
214 * (the previous check attempted to avoid this if the same
215 * ENGINE and EVP_MD could be used). */
216 if(ctx->engine)
217 ENGINE_finish(ctx->engine);
218 if(impl)
219 {
220 if (!ENGINE_init(impl))
221 {
222 EVPerr(EVP_F_DO_EVP_MD_ENGINE,EVP_R_INITIALIZATION_ERROR);
223 return 0;
224 }
225 }
226 else
227 /* Ask if an ENGINE is reserved for this job */
228 impl = ENGINE_get_digest_engine((*ptype)->type);
229 if(impl)
230 {
231 /* There's an ENGINE for this job ... (apparently) */
232 const EVP_MD *d = ENGINE_get_digest(impl, (*ptype)->type);
233 if(!d)
234 {
235 /* Same comment from evp_enc.c */
236 EVPerr(EVP_F_DO_EVP_MD_ENGINE,EVP_R_INITIALIZATION_ERROR);
237 return 0;
238 }
239 /* We'll use the ENGINE's private digest definition */
240 *ptype = d;
241 /* Store the ENGINE functional reference so we know
242 * 'type' came from an ENGINE and we need to release
243 * it when done. */
244 ctx->engine = impl;
245 }
246 else
247 ctx->engine = NULL;
248 }
249 else
250 if(!ctx->digest)
251 {
252 EVPerr(EVP_F_DO_EVP_MD_ENGINE,EVP_R_NO_DIGEST_SET);
253 return 0;
254 }
255 return 1;
256 }
257
258#endif
259
260#endif
261
262int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
263 {
264 M_EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
265#ifdef OPENSSL_FIPS
266 if(FIPS_selftest_failed())
267 {
268 FIPSerr(FIPS_F_EVP_DIGESTINIT_EX,FIPS_R_FIPS_SELFTEST_FAILED);
269 ctx->digest = &bad_md;
270 return 0;
271 }
272#endif
273#ifndef OPENSSL_NO_ENGINE
274 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
275 * so this context may already have an ENGINE! Try to avoid releasing
276 * the previous handle, re-querying for an ENGINE, and having a
277 * reinitialisation, when it may all be unecessary. */
278 if (ctx->engine && ctx->digest && (!type ||
279 (type && (type->type == ctx->digest->type))))
280 goto skip_to_init;
281 if (!do_evp_md_engine(ctx, &type, impl))
282 return 0;
283#endif
284 if (ctx->digest != type)
285 {
286#ifdef OPENSSL_FIPS
287 if (FIPS_mode())
288 {
289 if (!(type->flags & EVP_MD_FLAG_FIPS)
290 && !(ctx->flags & EVP_MD_CTX_FLAG_NON_FIPS_ALLOW))
291 {
292 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_DISABLED_FOR_FIPS);
293 ctx->digest = &bad_md;
294 return 0;
295 }
296 }
297#endif
298 if (ctx->digest && ctx->digest->ctx_size)
299 OPENSSL_free(ctx->md_data);
300 ctx->digest=type;
301 if (type->ctx_size)
302 ctx->md_data=OPENSSL_malloc(type->ctx_size);
303 }
304#ifndef OPENSSL_NO_ENGINE
305 skip_to_init:
306#endif
307 return ctx->digest->init(ctx);
308 }
309
310int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data,
311 size_t count)
312 {
313#ifdef OPENSSL_FIPS
314 FIPS_selftest_check();
315#endif
316 return ctx->digest->update(ctx,data,count);
317 }
318
319/* The caller can assume that this removes any secret data from the context */
320int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
321 {
322 int ret;
323 ret = EVP_DigestFinal_ex(ctx, md, size);
324 EVP_MD_CTX_cleanup(ctx);
325 return ret;
326 }
327
328/* The caller can assume that this removes any secret data from the context */
329int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
330 {
331 int ret;
332#ifdef OPENSSL_FIPS
333 FIPS_selftest_check();
334#endif
335
336 OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
337 ret=ctx->digest->final(ctx,md);
338 if (size != NULL)
339 *size=ctx->digest->md_size;
340 if (ctx->digest->cleanup)
341 {
342 ctx->digest->cleanup(ctx);
343 M_EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
344 }
345 memset(ctx->md_data,0,ctx->digest->ctx_size);
346 return ret;
347 }
348
349int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
350 {
351 EVP_MD_CTX_init(out);
352 return EVP_MD_CTX_copy_ex(out, in);
353 }
354
355int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
356 {
357 unsigned char *tmp_buf;
358 if ((in == NULL) || (in->digest == NULL))
359 {
360 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED);
361 return 0;
362 }
363#ifndef OPENSSL_NO_ENGINE
364 /* Make sure it's safe to copy a digest context using an ENGINE */
365 if (in->engine && !do_engine_init(in->engine))
366 {
367 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB);
368 return 0;
369 }
370#endif
371
372 if (out->digest == in->digest)
373 {
374 tmp_buf = out->md_data;
375 M_EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE);
376 }
377 else tmp_buf = NULL;
378 EVP_MD_CTX_cleanup(out);
379 memcpy(out,in,sizeof *out);
380
381 if (out->digest->ctx_size)
382 {
383 if (tmp_buf) out->md_data = tmp_buf;
384 else out->md_data=OPENSSL_malloc(out->digest->ctx_size);
385 memcpy(out->md_data,in->md_data,out->digest->ctx_size);
386 }
387
388 if (out->digest->copy)
389 return out->digest->copy(out,in);
390
391 return 1;
392 }
393
394int EVP_Digest(const void *data, size_t count,
395 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl)
396 {
397 EVP_MD_CTX ctx;
398 int ret;
399
400 EVP_MD_CTX_init(&ctx);
401 M_EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT);
402 ret=EVP_DigestInit_ex(&ctx, type, impl)
403 && EVP_DigestUpdate(&ctx, data, count)
404 && EVP_DigestFinal_ex(&ctx, md, size);
405 EVP_MD_CTX_cleanup(&ctx);
406
407 return ret;
408 }
409
410void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
411 {
412 EVP_MD_CTX_cleanup(ctx);
413 OPENSSL_free(ctx);
414 }
415
416/* This call frees resources associated with the context */
417int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
418 {
419 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final,
420 * because sometimes only copies of the context are ever finalised.
421 */
422 if (ctx->digest && ctx->digest->cleanup
423 && !M_EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED))
424 ctx->digest->cleanup(ctx);
425 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
426 && !M_EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE))
427 {
428 OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size);
429 OPENSSL_free(ctx->md_data);
430 }
431#ifndef OPENSSL_NO_ENGINE
432 if(ctx->engine)
433 /* The EVP_MD we used belongs to an ENGINE, release the
434 * functional reference we held for this reason. */
435 do_engine_finish(ctx->engine);
436#endif
437 memset(ctx,'\0',sizeof *ctx);
438
439 return 1;
440 }
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