/src/openssl/crypto/ecdsa/ecs_vrf.c
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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 | | */ |
71 | | int ECDSA_do_verify(const unsigned char *dgst, int dgst_len, |
72 | | const ECDSA_SIG *sig, EC_KEY *eckey) |
73 | 0 | { |
74 | 0 | ECDSA_DATA *ecdsa = ecdsa_check(eckey); |
75 | 0 | if (ecdsa == NULL) |
76 | 0 | return 0; |
77 | 0 | return ecdsa->meth->ecdsa_do_verify(dgst, dgst_len, sig, eckey); |
78 | 0 | } |
79 | | |
80 | | /*- |
81 | | * returns |
82 | | * 1: correct signature |
83 | | * 0: incorrect signature |
84 | | * -1: error |
85 | | */ |
86 | | int ECDSA_verify(int type, const unsigned char *dgst, int dgst_len, |
87 | | const unsigned char *sigbuf, int sig_len, EC_KEY *eckey) |
88 | 0 | { |
89 | 0 | ECDSA_SIG *s; |
90 | 0 | const unsigned char *p = sigbuf; |
91 | 0 | unsigned char *der = NULL; |
92 | 0 | int derlen = -1; |
93 | 0 | int ret = -1; |
94 | |
|
95 | 0 | s = ECDSA_SIG_new(); |
96 | 0 | if (s == NULL) |
97 | 0 | return (ret); |
98 | 0 | if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL) |
99 | 0 | goto err; |
100 | | /* Ensure signature uses DER and doesn't have trailing garbage */ |
101 | 0 | derlen = i2d_ECDSA_SIG(s, &der); |
102 | 0 | if (derlen != sig_len || memcmp(sigbuf, der, derlen)) |
103 | 0 | goto err; |
104 | 0 | ret = ECDSA_do_verify(dgst, dgst_len, s, eckey); |
105 | 0 | err: |
106 | 0 | if (derlen > 0) { |
107 | 0 | OPENSSL_cleanse(der, derlen); |
108 | 0 | OPENSSL_free(der); |
109 | 0 | } |
110 | 0 | ECDSA_SIG_free(s); |
111 | 0 | return (ret); |
112 | 0 | } |