1 /* crypto/evp/p_verify.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 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/evp.h>
62 #include <openssl/objects.h>
63 #include <openssl/x509.h>
64
65 int EVP_VerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sigbuf,
66 unsigned int siglen, EVP_PKEY *pkey)
67 {
68 unsigned char m[EVP_MAX_MD_SIZE];
69 unsigned int m_len;
70 int i = 0,ok = 0,v;
71 EVP_MD_CTX tmp_ctx;
72 EVP_PKEY_CTX *pkctx = NULL;
73
74 EVP_MD_CTX_init(&tmp_ctx);
75 if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx))
76 goto err;
77 if (!EVP_DigestFinal_ex(&tmp_ctx,&(m[0]),&m_len))
78 goto err;
79 EVP_MD_CTX_cleanup(&tmp_ctx);
80
81 if (ctx->digest->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE)
82 {
83 i = -1;
84 pkctx = EVP_PKEY_CTX_new(pkey, NULL);
85 if (!pkctx)
86 goto err;
87 if (EVP_PKEY_verify_init(pkctx) <= 0)
88 goto err;
89 if (EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) <= 0)
90 goto err;
91 i = EVP_PKEY_verify(pkctx, sigbuf, siglen, m, m_len);
92 err:
93 EVP_PKEY_CTX_free(pkctx);
94 return i;
95 }
96
97 for (i=0; i<4; i++)
98 {
99 v=ctx->digest->required_pkey_type[i];
100 if (v == 0) break;
101 if (pkey->type == v)
102 {
103 ok=1;
104 break;
105 }
106 }
107 if (!ok)
108 {
109 EVPerr(EVP_F_EVP_VERIFYFINAL,EVP_R_WRONG_PUBLIC_KEY_TYPE);
110 return(-1);
111 }
112 if (ctx->digest->verify == NULL)
113 {
114 EVPerr(EVP_F_EVP_VERIFYFINAL,EVP_R_NO_VERIFY_FUNCTION_CONFIGURED);
115 return(0);
116 }
117
118 return(ctx->digest->verify(ctx->digest->type,m,m_len,
119 sigbuf,siglen,pkey->pkey.ptr));
120 }