1 /* Copyright (C) 1995-1998 Eric Young ([email protected])
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young ([email protected]).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
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 ([email protected]).
14 *
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.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
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 ([email protected])"
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 ([email protected])"
39 *
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
50 * SUCH DAMAGE.
51 *
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.] */
56
57 #include <openssl/evp.h>
58
59 #include <limits.h>
60
61 #include <openssl/digest.h>
62 #include <openssl/err.h>
63
64 #include "internal.h"
65
66
EVP_SignInit_ex(EVP_MD_CTX * ctx,const EVP_MD * type,ENGINE * impl)67 int EVP_SignInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) {
68 return EVP_DigestInit_ex(ctx, type, impl);
69 }
70
EVP_SignInit(EVP_MD_CTX * ctx,const EVP_MD * type)71 int EVP_SignInit(EVP_MD_CTX *ctx, const EVP_MD *type) {
72 return EVP_DigestInit(ctx, type);
73 }
74
EVP_SignUpdate(EVP_MD_CTX * ctx,const void * data,size_t len)75 int EVP_SignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
76 return EVP_DigestUpdate(ctx, data, len);
77 }
78
EVP_SignFinal(const EVP_MD_CTX * ctx,uint8_t * sig,unsigned * out_sig_len,EVP_PKEY * pkey)79 int EVP_SignFinal(const EVP_MD_CTX *ctx, uint8_t *sig, unsigned *out_sig_len,
80 EVP_PKEY *pkey) {
81 uint8_t m[EVP_MAX_MD_SIZE];
82 unsigned m_len;
83 int ret = 0;
84 EVP_MD_CTX tmp_ctx;
85 EVP_PKEY_CTX *pkctx = NULL;
86 size_t sig_len = EVP_PKEY_size(pkey);
87
88 // Ensure the final result will fit in |unsigned|.
89 if (sig_len > UINT_MAX) {
90 sig_len = UINT_MAX;
91 }
92
93 *out_sig_len = 0;
94 EVP_MD_CTX_init(&tmp_ctx);
95 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) ||
96 !EVP_DigestFinal_ex(&tmp_ctx, m, &m_len)) {
97 goto out;
98 }
99 EVP_MD_CTX_cleanup(&tmp_ctx);
100
101 pkctx = EVP_PKEY_CTX_new(pkey, NULL);
102 if (!pkctx || //
103 !EVP_PKEY_sign_init(pkctx) ||
104 !EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) ||
105 !EVP_PKEY_sign(pkctx, sig, &sig_len, m, m_len)) {
106 goto out;
107 }
108 *out_sig_len = (unsigned)sig_len;
109 ret = 1;
110
111 out:
112 EVP_PKEY_CTX_free(pkctx);
113 return ret;
114 }
115
EVP_VerifyInit_ex(EVP_MD_CTX * ctx,const EVP_MD * type,ENGINE * impl)116 int EVP_VerifyInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) {
117 return EVP_DigestInit_ex(ctx, type, impl);
118 }
119
EVP_VerifyInit(EVP_MD_CTX * ctx,const EVP_MD * type)120 int EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type) {
121 return EVP_DigestInit(ctx, type);
122 }
123
EVP_VerifyUpdate(EVP_MD_CTX * ctx,const void * data,size_t len)124 int EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
125 return EVP_DigestUpdate(ctx, data, len);
126 }
127
EVP_VerifyFinal(EVP_MD_CTX * ctx,const uint8_t * sig,size_t sig_len,EVP_PKEY * pkey)128 int EVP_VerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig, size_t sig_len,
129 EVP_PKEY *pkey) {
130 uint8_t m[EVP_MAX_MD_SIZE];
131 unsigned m_len;
132 int ret = 0;
133 EVP_MD_CTX tmp_ctx;
134 EVP_PKEY_CTX *pkctx = NULL;
135
136 EVP_MD_CTX_init(&tmp_ctx);
137 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) ||
138 !EVP_DigestFinal_ex(&tmp_ctx, m, &m_len)) {
139 EVP_MD_CTX_cleanup(&tmp_ctx);
140 goto out;
141 }
142 EVP_MD_CTX_cleanup(&tmp_ctx);
143
144 pkctx = EVP_PKEY_CTX_new(pkey, NULL);
145 if (!pkctx ||
146 !EVP_PKEY_verify_init(pkctx) ||
147 !EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest)) {
148 goto out;
149 }
150 ret = EVP_PKEY_verify(pkctx, sig, sig_len, m, m_len);
151
152 out:
153 EVP_PKEY_CTX_free(pkctx);
154 return ret;
155 }
156
157