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Commit | Line | Data |
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4d94ae00 | 1 | /* crypto/ecdsa/ecdsa_vrf.c */ |
a0bee97e NL |
2 | /* |
3 | * Written by Nils Larsch for the OpenSSL project | |
4 | */ | |
4d94ae00 BM |
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 | |
0f113f3e | 13 | * notice, this list of conditions and the following disclaimer. |
4d94ae00 BM |
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 | */ | |
0bee0e62 | 58 | |
bd3602eb DSH |
59 | #include <openssl/ec.h> |
60 | #include "ec_lcl.h" | |
b1ffc6ca | 61 | #include <string.h> |
58ae65cd | 62 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 63 | # include <openssl/engine.h> |
58ae65cd | 64 | #endif |
6e73d12e | 65 | #include <openssl/err.h> |
4d94ae00 | 66 | |
1d97c843 TH |
67 | /*- |
68 | * returns | |
4d94ae00 BM |
69 | * 1: correct signature |
70 | * 0: incorrect signature | |
71 | * -1: error | |
72 | */ | |
0f113f3e MC |
73 | int ECDSA_do_verify(const unsigned char *dgst, int dgst_len, |
74 | const ECDSA_SIG *sig, EC_KEY *eckey) | |
75 | { | |
bd3602eb DSH |
76 | if (eckey->meth->verify_sig) |
77 | return eckey->meth->verify_sig(dgst, dgst_len, sig, eckey); | |
6e73d12e | 78 | ECerr(EC_F_ECDSA_DO_VERIFY, EC_R_OPERATION_NOT_SUPPORTED); |
bd3602eb | 79 | return 0; |
0f113f3e | 80 | } |
4d94ae00 | 81 | |
1d97c843 TH |
82 | /*- |
83 | * returns | |
4d94ae00 BM |
84 | * 1: correct signature |
85 | * 0: incorrect signature | |
86 | * -1: error | |
87 | */ | |
14a7cfb3 | 88 | int ECDSA_verify(int type, const unsigned char *dgst, int dgst_len, |
0f113f3e MC |
89 | const unsigned char *sigbuf, int sig_len, EC_KEY *eckey) |
90 | { | |
91 | ECDSA_SIG *s; | |
92 | const unsigned char *p = sigbuf; | |
93 | unsigned char *der = NULL; | |
94 | int derlen = -1; | |
95 | int ret = -1; | |
4d94ae00 | 96 | |
0f113f3e MC |
97 | s = ECDSA_SIG_new(); |
98 | if (s == NULL) | |
99 | return (ret); | |
100 | if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL) | |
101 | goto err; | |
102 | /* Ensure signature uses DER and doesn't have trailing garbage */ | |
103 | derlen = i2d_ECDSA_SIG(s, &der); | |
104 | if (derlen != sig_len || memcmp(sigbuf, der, derlen)) | |
105 | goto err; | |
106 | ret = ECDSA_do_verify(dgst, dgst_len, s, eckey); | |
107 | err: | |
4b45c6e5 | 108 | OPENSSL_clear_free(der, derlen); |
0f113f3e MC |
109 | ECDSA_SIG_free(s); |
110 | return (ret); | |
111 | } |