p_verify.c revision 296341 
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
65int 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        i = -1;
83        pkctx = EVP_PKEY_CTX_new(pkey, NULL);
84        if (!pkctx)
85            goto err;
86        if (EVP_PKEY_verify_init(pkctx) <= 0)
87            goto err;
88        if (EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) <= 0)
89            goto err;
90        i = EVP_PKEY_verify(pkctx, sigbuf, siglen, m, m_len);
91 err:
92        EVP_PKEY_CTX_free(pkctx);
93        return i;
94    }
95
96    for (i = 0; i < 4; i++) {
97        v = ctx->digest->required_pkey_type[i];
98        if (v == 0)
99            break;
100        if (pkey->type == v) {
101            ok = 1;
102            break;
103        }
104    }
105    if (!ok) {
106        EVPerr(EVP_F_EVP_VERIFYFINAL, EVP_R_WRONG_PUBLIC_KEY_TYPE);
107        return (-1);
108    }
109    if (ctx->digest->verify == NULL) {
110        EVPerr(EVP_F_EVP_VERIFYFINAL, EVP_R_NO_VERIFY_FUNCTION_CONFIGURED);
111        return (0);
112    }
113
114    return (ctx->digest->verify(ctx->digest->type, m, m_len,
115                                sigbuf, siglen, pkey->pkey.ptr));
116}
117