1 /* crypto/evp/digest.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
58 /* ====================================================================
59 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
113 #include "cryptlib.h"
114 #include <openssl/objects.h>
115 #include <openssl/evp.h>
116 #ifndef OPENSSL_NO_ENGINE
117 #include <openssl/engine.h>
120 void EVP_MD_CTX_init(EVP_MD_CTX
*ctx
)
122 memset(ctx
,'\0',sizeof *ctx
);
125 EVP_MD_CTX
*EVP_MD_CTX_create(void)
127 EVP_MD_CTX
*ctx
=OPENSSL_malloc(sizeof *ctx
);
129 EVP_MD_CTX_init(ctx
);
134 int EVP_DigestInit(EVP_MD_CTX
*ctx
, const EVP_MD
*type
)
136 EVP_MD_CTX_init(ctx
);
137 return EVP_DigestInit_ex(ctx
, type
, NULL
);
140 int EVP_DigestInit_ex(EVP_MD_CTX
*ctx
, const EVP_MD
*type
, ENGINE
*impl
)
142 EVP_MD_CTX_clear_flags(ctx
,EVP_MD_CTX_FLAG_CLEANED
);
143 #ifndef OPENSSL_NO_ENGINE
144 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
145 * so this context may already have an ENGINE! Try to avoid releasing
146 * the previous handle, re-querying for an ENGINE, and having a
147 * reinitialisation, when it may all be unecessary. */
148 if (ctx
->engine
&& ctx
->digest
&& (!type
||
149 (type
&& (type
->type
== ctx
->digest
->type
))))
153 /* Ensure an ENGINE left lying around from last time is cleared
154 * (the previous check attempted to avoid this if the same
155 * ENGINE and EVP_MD could be used). */
157 ENGINE_finish(ctx
->engine
);
160 if (!ENGINE_init(impl
))
162 EVPerr(EVP_F_EVP_DIGESTINIT
, EVP_R_INITIALIZATION_ERROR
);
167 /* Ask if an ENGINE is reserved for this job */
168 impl
= ENGINE_get_digest_engine(type
->type
);
171 /* There's an ENGINE for this job ... (apparently) */
172 const EVP_MD
*d
= ENGINE_get_digest(impl
, type
->type
);
175 /* Same comment from evp_enc.c */
176 EVPerr(EVP_F_EVP_DIGESTINIT
, EVP_R_INITIALIZATION_ERROR
);
179 /* We'll use the ENGINE's private digest definition */
181 /* Store the ENGINE functional reference so we know
182 * 'type' came from an ENGINE and we need to release
192 EVPerr(EVP_F_EVP_DIGESTINIT
, EVP_R_NO_DIGEST_SET
);
196 if (ctx
->digest
!= type
)
198 if (ctx
->digest
&& ctx
->digest
->ctx_size
)
199 OPENSSL_free(ctx
->md_data
);
202 ctx
->md_data
=OPENSSL_malloc(type
->ctx_size
);
204 #ifndef OPENSSL_NO_ENGINE
207 return ctx
->digest
->init(ctx
);
210 int EVP_DigestUpdate(EVP_MD_CTX
*ctx
, const void *data
,
213 return ctx
->digest
->update(ctx
,data
,(unsigned long)count
);
216 /* The caller can assume that this removes any secret data from the context */
217 int EVP_DigestFinal(EVP_MD_CTX
*ctx
, unsigned char *md
, unsigned int *size
)
220 ret
= EVP_DigestFinal_ex(ctx
, md
, size
);
221 EVP_MD_CTX_cleanup(ctx
);
225 /* The caller can assume that this removes any secret data from the context */
226 int EVP_DigestFinal_ex(EVP_MD_CTX
*ctx
, unsigned char *md
, unsigned int *size
)
230 OPENSSL_assert(ctx
->digest
->md_size
<= EVP_MAX_MD_SIZE
);
231 ret
=ctx
->digest
->final(ctx
,md
);
233 *size
=ctx
->digest
->md_size
;
234 if (ctx
->digest
->cleanup
)
236 ctx
->digest
->cleanup(ctx
);
237 EVP_MD_CTX_set_flags(ctx
,EVP_MD_CTX_FLAG_CLEANED
);
239 memset(ctx
->md_data
,0,ctx
->digest
->ctx_size
);
243 int EVP_MD_CTX_copy(EVP_MD_CTX
*out
, const EVP_MD_CTX
*in
)
245 EVP_MD_CTX_init(out
);
246 return EVP_MD_CTX_copy_ex(out
, in
);
249 int EVP_MD_CTX_copy_ex(EVP_MD_CTX
*out
, const EVP_MD_CTX
*in
)
251 unsigned char *tmp_buf
;
252 if ((in
== NULL
) || (in
->digest
== NULL
))
254 EVPerr(EVP_F_EVP_MD_CTX_COPY
,EVP_R_INPUT_NOT_INITIALIZED
);
257 #ifndef OPENSSL_NO_ENGINE
258 /* Make sure it's safe to copy a digest context using an ENGINE */
259 if (in
->engine
&& !ENGINE_init(in
->engine
))
261 EVPerr(EVP_F_EVP_MD_CTX_COPY
,ERR_R_ENGINE_LIB
);
266 if (out
->digest
== in
->digest
)
268 tmp_buf
= out
->md_data
;
269 EVP_MD_CTX_set_flags(out
,EVP_MD_CTX_FLAG_REUSE
);
272 EVP_MD_CTX_cleanup(out
);
273 memcpy(out
,in
,sizeof *out
);
275 if (out
->digest
->ctx_size
)
277 if (tmp_buf
) out
->md_data
= tmp_buf
;
278 else out
->md_data
=OPENSSL_malloc(out
->digest
->ctx_size
);
279 memcpy(out
->md_data
,in
->md_data
,out
->digest
->ctx_size
);
282 if (out
->digest
->copy
)
283 return out
->digest
->copy(out
,in
);
288 int EVP_Digest(const void *data
, unsigned int count
,
289 unsigned char *md
, unsigned int *size
, const EVP_MD
*type
, ENGINE
*impl
)
294 EVP_MD_CTX_init(&ctx
);
295 EVP_MD_CTX_set_flags(&ctx
,EVP_MD_CTX_FLAG_ONESHOT
);
296 ret
=EVP_DigestInit_ex(&ctx
, type
, impl
)
297 && EVP_DigestUpdate(&ctx
, data
, count
)
298 && EVP_DigestFinal_ex(&ctx
, md
, size
);
299 EVP_MD_CTX_cleanup(&ctx
);
304 void EVP_MD_CTX_destroy(EVP_MD_CTX
*ctx
)
306 EVP_MD_CTX_cleanup(ctx
);
310 /* This call frees resources associated with the context */
311 int EVP_MD_CTX_cleanup(EVP_MD_CTX
*ctx
)
313 /* Don't assume ctx->md_data was cleaned in EVP_Digest_Final,
314 * because sometimes only copies of the context are ever finalised.
316 if (ctx
->digest
&& ctx
->digest
->cleanup
317 && !EVP_MD_CTX_test_flags(ctx
,EVP_MD_CTX_FLAG_CLEANED
))
318 ctx
->digest
->cleanup(ctx
);
319 if (ctx
->digest
&& ctx
->digest
->ctx_size
&& ctx
->md_data
320 && !EVP_MD_CTX_test_flags(ctx
, EVP_MD_CTX_FLAG_REUSE
))
322 OPENSSL_cleanse(ctx
->md_data
,ctx
->digest
->ctx_size
);
323 OPENSSL_free(ctx
->md_data
);
325 #ifndef OPENSSL_NO_ENGINE
327 /* The EVP_MD we used belongs to an ENGINE, release the
328 * functional reference we held for this reason. */
329 ENGINE_finish(ctx
->engine
);
331 memset(ctx
,'\0',sizeof *ctx
);