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);
130 EVP_MD_CTX_init(ctx);
135 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
137 EVP_MD_CTX_init(ctx);
138 return EVP_DigestInit_ex(ctx, type, NULL);
141 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
143 EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
144 #ifndef OPENSSL_NO_ENGINE
146 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
147 * this context may already have an ENGINE! Try to avoid releasing the
148 * previous handle, re-querying for an ENGINE, and having a
149 * reinitialisation, when it may all be unecessary.
151 if (ctx->engine && ctx->digest && (!type ||
154 ctx->digest->type))))
158 * Ensure an ENGINE left lying around from last time is cleared (the
159 * previous check attempted to avoid this if the same ENGINE and
160 * EVP_MD could be used).
163 ENGINE_finish(ctx->engine);
165 if (!ENGINE_init(impl)) {
166 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
170 /* Ask if an ENGINE is reserved for this job */
171 impl = ENGINE_get_digest_engine(type->type);
173 /* There's an ENGINE for this job ... (apparently) */
174 const EVP_MD *d = ENGINE_get_digest(impl, type->type);
176 /* Same comment from evp_enc.c */
177 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
181 /* We'll use the ENGINE's private digest definition */
184 * Store the ENGINE functional reference so we know 'type' came
185 * from an ENGINE and we need to release it when done.
192 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET);
198 if (ctx->digest != type) {
199 if (ctx->digest && ctx->digest->ctx_size)
200 OPENSSL_free(ctx->md_data);
202 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
203 ctx->update = type->update;
204 ctx->md_data = OPENSSL_malloc(type->ctx_size);
205 if (ctx->md_data == NULL) {
206 EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE);
211 #ifndef OPENSSL_NO_ENGINE
216 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
217 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
218 if (r <= 0 && (r != -2))
221 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
223 return ctx->digest->init(ctx);
226 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
228 return ctx->update(ctx, data, count);
231 /* The caller can assume that this removes any secret data from the context */
232 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
235 ret = EVP_DigestFinal_ex(ctx, md, size);
236 EVP_MD_CTX_cleanup(ctx);
240 /* The caller can assume that this removes any secret data from the context */
241 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
245 OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
246 ret = ctx->digest->final(ctx, md);
248 *size = ctx->digest->md_size;
249 if (ctx->digest->cleanup) {
250 ctx->digest->cleanup(ctx);
251 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
253 memset(ctx->md_data, 0, ctx->digest->ctx_size);
257 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
259 EVP_MD_CTX_init(out);
260 return EVP_MD_CTX_copy_ex(out, in);
263 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
265 unsigned char *tmp_buf;
266 if ((in == NULL) || (in->digest == NULL)) {
267 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED);
270 #ifndef OPENSSL_NO_ENGINE
271 /* Make sure it's safe to copy a digest context using an ENGINE */
272 if (in->engine && !ENGINE_init(in->engine)) {
273 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB);
278 if (out->digest == in->digest) {
279 tmp_buf = out->md_data;
280 EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
283 EVP_MD_CTX_cleanup(out);
284 memcpy(out, in, sizeof *out);
286 if (in->md_data && out->digest->ctx_size) {
288 out->md_data = tmp_buf;
290 out->md_data = OPENSSL_malloc(out->digest->ctx_size);
292 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE);
296 memcpy(out->md_data, in->md_data, out->digest->ctx_size);
299 out->update = in->update;
302 out->pctx = EVP_PKEY_CTX_dup(in->pctx);
304 EVP_MD_CTX_cleanup(out);
309 if (out->digest->copy)
310 return out->digest->copy(out, in);
315 int EVP_Digest(const void *data, size_t count,
316 unsigned char *md, unsigned int *size, const EVP_MD *type,
322 EVP_MD_CTX_init(&ctx);
323 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT);
324 ret = EVP_DigestInit_ex(&ctx, type, impl)
325 && EVP_DigestUpdate(&ctx, data, count)
326 && EVP_DigestFinal_ex(&ctx, md, size);
327 EVP_MD_CTX_cleanup(&ctx);
332 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
335 EVP_MD_CTX_cleanup(ctx);
340 /* This call frees resources associated with the context */
341 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
344 * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because
345 * sometimes only copies of the context are ever finalised.
347 if (ctx->digest && ctx->digest->cleanup
348 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED))
349 ctx->digest->cleanup(ctx);
350 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
351 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
352 OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
353 OPENSSL_free(ctx->md_data);
356 EVP_PKEY_CTX_free(ctx->pctx);
357 #ifndef OPENSSL_NO_ENGINE
360 * The EVP_MD we used belongs to an ENGINE, release the functional
361 * reference we held for this reason.
363 ENGINE_finish(ctx->engine);
365 memset(ctx, '\0', sizeof *ctx);