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81a88203 | 1 | /* rsa-sha256-verify.c |
90112edb NM |
2 | |
3 | Verifying signatures created with RSA and SHA256. | |
4 | ||
5 | Copyright (C) 2001, 2003, 2006 Niels Möller | |
6 | ||
7 | This file is part of GNU Nettle. | |
8 | ||
9 | GNU Nettle is free software: you can redistribute it and/or | |
10 | modify it under the terms of either: | |
11 | ||
12 | * the GNU Lesser General Public License as published by the Free | |
13 | Software Foundation; either version 3 of the License, or (at your | |
14 | option) any later version. | |
15 | ||
16 | or | |
17 | ||
18 | * the GNU General Public License as published by the Free | |
19 | Software Foundation; either version 2 of the License, or (at your | |
20 | option) any later version. | |
21 | ||
22 | or both in parallel, as here. | |
23 | ||
24 | GNU Nettle is distributed in the hope that it will be useful, | |
25 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
27 | General Public License for more details. | |
28 | ||
29 | You should have received copies of the GNU General Public License and | |
30 | the GNU Lesser General Public License along with this program. If | |
31 | not, see http://www.gnu.org/licenses/. | |
32 | */ | |
81a88203 NM |
33 | |
34 | #if HAVE_CONFIG_H | |
35 | # include "config.h" | |
36 | #endif | |
37 | ||
81a88203 NM |
38 | #include <assert.h> |
39 | ||
40 | #include "rsa.h" | |
da81c86a | 41 | #include "rsa-internal.h" |
81a88203 NM |
42 | |
43 | #include "bignum.h" | |
44 | #include "pkcs1.h" | |
45 | ||
46 | int | |
47 | rsa_sha256_verify(const struct rsa_public_key *key, | |
48 | struct sha256_ctx *hash, | |
49 | const mpz_t s) | |
50 | { | |
51 | int res; | |
52 | mpz_t m; | |
53 | ||
81a88203 | 54 | mpz_init(m); |
c72c16b7 | 55 | |
adad6eaa | 56 | res = (pkcs1_rsa_sha256_encode(m, key->size, hash) |
c72c16b7 | 57 | &&_rsa_verify(key, m, s)); |
81a88203 NM |
58 | |
59 | mpz_clear(m); | |
60 | ||
61 | return res; | |
62 | } | |
63 | ||
64 | int | |
65 | rsa_sha256_verify_digest(const struct rsa_public_key *key, | |
66 | const uint8_t *digest, | |
67 | const mpz_t s) | |
68 | { | |
69 | int res; | |
70 | mpz_t m; | |
71 | ||
81a88203 NM |
72 | mpz_init(m); |
73 | ||
adad6eaa | 74 | res = (pkcs1_rsa_sha256_encode_digest(m, key->size, digest) |
c72c16b7 | 75 | && _rsa_verify(key, m, s)); |
81a88203 NM |
76 | |
77 | mpz_clear(m); | |
78 | ||
79 | return res; | |
80 | } |