summaryrefslogtreecommitdiff
path: root/rsa-sha512-verify.c
blob: 869a8f5139805c93063c5240b06439278c3cb1d9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
/* rsa-sha512-verify.c
 *
 * Verifying signatures created with RSA and SHA512.
 */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 2001, 2003, 2006, 2010 Niels Möller
 *  
 * The nettle library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 * 
 * The nettle library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with the nettle library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

#if HAVE_CONFIG_H
# include "config.h"
#endif

#include <assert.h>

#include "rsa.h"

#include "bignum.h"
#include "pkcs1.h"

int
rsa_sha512_verify(const struct rsa_public_key *key,
		  struct sha512_ctx *hash,
		  const mpz_t s)
{
  int res;
  mpz_t m;

  assert(key->size > 0);
  mpz_init(m);
  
  res = (pkcs1_rsa_sha512_encode(m, key->size - 1, hash) 
	 && _rsa_verify(key, m, s));
  
  mpz_clear(m);

  return res;
}

int
rsa_sha512_verify_digest(const struct rsa_public_key *key,
			 const uint8_t *digest,
			 const mpz_t s)
{
  int res;
  mpz_t m;

  assert(key->size > 0);
  mpz_init(m);
  
  res = (pkcs1_rsa_sha512_encode_digest(m, key->size - 1, digest)
	 && _rsa_verify(key, m, s));
  
  mpz_clear(m);

  return res;
}