1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
57 /* ====================================================================
58 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
60 * Redistribution and use in source and binary forms, with or without
61 * modification, are permitted provided that the following conditions
64 * 1. Redistributions of source code must retain the above copyright
65 * notice, this list of conditions and the following disclaimer.
67 * 2. Redistributions in binary form must reproduce the above copyright
68 * notice, this list of conditions and the following disclaimer in
69 * the documentation and/or other materials provided with the
72 * 3. All advertising materials mentioning features or use of this
73 * software must display the following acknowledgment:
74 * "This product includes software developed by the OpenSSL Project
75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
78 * endorse or promote products derived from this software without
79 * prior written permission. For written permission, please contact
80 * openssl-core@openssl.org.
82 * 5. Products derived from this software may not be called "OpenSSL"
83 * nor may "OpenSSL" appear in their names without prior written
84 * permission of the OpenSSL Project.
86 * 6. Redistributions of any form whatsoever must retain the following
88 * "This product includes software developed by the OpenSSL Project
89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
102 * OF THE POSSIBILITY OF SUCH DAMAGE.
103 * ====================================================================
105 * This product includes cryptographic software written by Eric Young
106 * (eay@cryptsoft.com). This product includes software written by Tim
107 * Hudson (tjh@cryptsoft.com).
112 #include "internal/cryptlib.h"
113 #include <openssl/objects.h>
114 #include <openssl/evp.h>
115 #include <openssl/engine.h>
116 #include "internal/evp_int.h"
117 #include "evp_locl.h"
119 /* This call frees resources associated with the context */
120 int EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
126 * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because
127 * sometimes only copies of the context are ever finalised.
129 if (ctx->digest && ctx->digest->cleanup
130 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED))
131 ctx->digest->cleanup(ctx);
132 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
133 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
134 OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
136 EVP_PKEY_CTX_free(ctx->pctx);
137 #ifndef OPENSSL_NO_ENGINE
138 ENGINE_finish(ctx->engine);
140 memset(ctx, 0, sizeof(*ctx));
145 EVP_MD_CTX *EVP_MD_CTX_new(void)
147 return OPENSSL_zalloc(sizeof(EVP_MD_CTX));
150 void EVP_MD_CTX_free(EVP_MD_CTX *ctx)
152 EVP_MD_CTX_reset(ctx);
156 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
158 EVP_MD_CTX_reset(ctx);
159 return EVP_DigestInit_ex(ctx, type, NULL);
162 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
164 EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
165 #ifndef OPENSSL_NO_ENGINE
167 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
168 * this context may already have an ENGINE! Try to avoid releasing the
169 * previous handle, re-querying for an ENGINE, and having a
170 * reinitialisation, when it may all be unnecessary.
172 if (ctx->engine && ctx->digest && (!type ||
175 ctx->digest->type))))
179 * Ensure an ENGINE left lying around from last time is cleared (the
180 * previous check attempted to avoid this if the same ENGINE and
181 * EVP_MD could be used).
183 ENGINE_finish(ctx->engine);
185 if (!ENGINE_init(impl)) {
186 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
190 /* Ask if an ENGINE is reserved for this job */
191 impl = ENGINE_get_digest_engine(type->type);
194 /* There's an ENGINE for this job ... (apparently) */
195 const EVP_MD *d = ENGINE_get_digest(impl, type->type);
198 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
202 /* We'll use the ENGINE's private digest definition */
205 * Store the ENGINE functional reference so we know 'type' came
206 * from an ENGINE and we need to release it when done.
213 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET);
219 if (ctx->digest != type) {
220 if (ctx->digest && ctx->digest->ctx_size) {
221 OPENSSL_free(ctx->md_data);
225 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
226 ctx->update = type->update;
227 ctx->md_data = OPENSSL_zalloc(type->ctx_size);
228 if (ctx->md_data == NULL) {
229 EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE);
234 #ifndef OPENSSL_NO_ENGINE
239 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
240 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
241 if (r <= 0 && (r != -2))
244 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
246 return ctx->digest->init(ctx);
249 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
251 return ctx->update(ctx, data, count);
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)
258 ret = EVP_DigestFinal_ex(ctx, md, size);
259 EVP_MD_CTX_reset(ctx);
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)
268 OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
269 ret = ctx->digest->final(ctx, md);
271 *size = ctx->digest->md_size;
272 if (ctx->digest->cleanup) {
273 ctx->digest->cleanup(ctx);
274 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
276 memset(ctx->md_data, 0, ctx->digest->ctx_size);
280 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
282 EVP_MD_CTX_reset(out);
283 return EVP_MD_CTX_copy_ex(out, in);
286 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
288 unsigned char *tmp_buf;
289 if ((in == NULL) || (in->digest == NULL)) {
290 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED);
293 #ifndef OPENSSL_NO_ENGINE
294 /* Make sure it's safe to copy a digest context using an ENGINE */
295 if (in->engine && !ENGINE_init(in->engine)) {
296 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB);
301 if (out->digest == in->digest) {
302 tmp_buf = out->md_data;
303 EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
306 EVP_MD_CTX_reset(out);
307 memcpy(out, in, sizeof(*out));
309 /* Null these variables, since they are getting fixed up
310 * properly below. Anything else may cause a memleak and/or
311 * double free if any of the memory allocations below fail
316 if (in->md_data && out->digest->ctx_size) {
318 out->md_data = tmp_buf;
320 out->md_data = OPENSSL_malloc(out->digest->ctx_size);
321 if (out->md_data == NULL) {
322 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE);
326 memcpy(out->md_data, in->md_data, out->digest->ctx_size);
329 out->update = in->update;
332 out->pctx = EVP_PKEY_CTX_dup(in->pctx);
334 EVP_MD_CTX_reset(out);
339 if (out->digest->copy)
340 return out->digest->copy(out, in);
345 int EVP_Digest(const void *data, size_t count,
346 unsigned char *md, unsigned int *size, const EVP_MD *type,
349 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
354 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT);
355 ret = EVP_DigestInit_ex(ctx, type, impl)
356 && EVP_DigestUpdate(ctx, data, count)
357 && EVP_DigestFinal_ex(ctx, md, size);
358 EVP_MD_CTX_free(ctx);
363 int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2)
365 if (ctx->digest && ctx->digest->md_ctrl) {
366 int ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2);