ecs_vrf.c revision 296465 
1/* crypto/ecdsa/ecdsa_vrf.c */
2/*
3 * Written by Nils Larsch for the OpenSSL project
4 */
5/* ====================================================================
6 * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in
17 *    the documentation and/or other materials provided with the
18 *    distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 *    software must display the following acknowledgment:
22 *    "This product includes software developed by the OpenSSL Project
23 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 *    endorse or promote products derived from this software without
27 *    prior written permission. For written permission, please contact
28 *    openssl-core@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 *    nor may "OpenSSL" appear in their names without prior written
32 *    permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 *    acknowledgment:
36 *    "This product includes software developed by the OpenSSL Project
37 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#include "ecs_locl.h"
60#include <string.h>
61#ifndef OPENSSL_NO_ENGINE
62# include <openssl/engine.h>
63#endif
64
65/*-
66 * returns
67 *      1: correct signature
68 *      0: incorrect signature
69 *     -1: error
70 */
71int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
72                    const ECDSA_SIG *sig, EC_KEY *eckey)
73{
74    ECDSA_DATA *ecdsa = ecdsa_check(eckey);
75    if (ecdsa == NULL)
76        return 0;
77    return ecdsa->meth->ecdsa_do_verify(dgst, dgst_len, sig, eckey);
78}
79
80/*-
81 * returns
82 *      1: correct signature
83 *      0: incorrect signature
84 *     -1: error
85 */
86int ECDSA_verify(int type, const unsigned char *dgst, int dgst_len,
87                 const unsigned char *sigbuf, int sig_len, EC_KEY *eckey)
88{
89    ECDSA_SIG *s;
90    const unsigned char *p = sigbuf;
91    unsigned char *der = NULL;
92    int derlen = -1;
93    int ret = -1;
94
95    s = ECDSA_SIG_new();
96    if (s == NULL)
97        return (ret);
98    if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL)
99        goto err;
100    /* Ensure signature uses DER and doesn't have trailing garbage */
101    derlen = i2d_ECDSA_SIG(s, &der);
102    if (derlen != sig_len || memcmp(sigbuf, der, derlen))
103        goto err;
104    ret = ECDSA_do_verify(dgst, dgst_len, s, eckey);
105 err:
106    if (derlen > 0) {
107        OPENSSL_cleanse(der, derlen);
108        OPENSSL_free(der);
109    }
110    ECDSA_SIG_free(s);
111    return (ret);
112}
113