nettle  3.7.3
About: Nettle is a low-level cryptographic library.
  Fossies Dox: nettle-3.7.3.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

rsa-sha256-verify.c
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1 /* rsa-sha256-verify.c
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 */
33 
34 #if HAVE_CONFIG_H
35 # include "config.h"
36 #endif
37 
38 #include <assert.h>
39 
40 #include "rsa.h"
41 #include "rsa-internal.h"
42 
43 #include "bignum.h"
44 #include "pkcs1.h"
45 
46 int
48  struct sha256_ctx *hash,
49  const mpz_t s)
50 {
51  int res;
52  mpz_t m;
53 
54  mpz_init(m);
55 
56  res = (pkcs1_rsa_sha256_encode(m, key->size, hash)
57  &&_rsa_verify(key, m, s));
58 
59  mpz_clear(m);
60 
61  return res;
62 }
63 
64 int
66  const uint8_t *digest,
67  const mpz_t s)
68 {
69  int res;
70  mpz_t m;
71 
72  mpz_init(m);
73 
74  res = (pkcs1_rsa_sha256_encode_digest(m, key->size, digest)
75  && _rsa_verify(key, m, s));
76 
77  mpz_clear(m);
78 
79  return res;
80 }
#define hash
void mpz_init(mpz_t r)
Definition: mini-gmp.c:1410
void mpz_clear(mpz_t r)
Definition: mini-gmp.c:1435
__mpz_struct mpz_t[1]
Definition: mini-gmp.h:77
#define pkcs1_rsa_sha256_encode_digest
Definition: pkcs1.h:51
#define pkcs1_rsa_sha256_encode
Definition: pkcs1.h:50
#define _rsa_verify
Definition: rsa-internal.h:39
#define rsa_sha256_verify
Definition: rsa.h:66
#define rsa_sha256_verify_digest
Definition: rsa.h:78
size_t size
Definition: rsa.h:118