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-pss-sha256-sign-tr.c
Go to the documentation of this file.
1 /* rsa-pss-sha256-sign-tr.c
2 
3  Signatures using RSA and SHA-256, with PSS padding.
4 
5  Copyright (C) 2017 Daiki Ueno
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 "rsa.h"
39 #include "rsa-internal.h"
40 
41 #include "bignum.h"
42 #include "pss.h"
43 
44 int
46  const struct rsa_private_key *key,
47  void *random_ctx, nettle_random_func *random,
48  size_t salt_length, const uint8_t *salt,
49  const uint8_t *digest,
50  mpz_t s)
51 {
52  mpz_t m;
53  int res;
54 
55  mpz_init (m);
56 
57  res = (pss_encode_mgf1(m, mpz_sizeinbase(pub->n, 2) - 1, &nettle_sha256,
58  salt_length, salt, digest)
59  && rsa_compute_root_tr (pub, key,
60  random_ctx, random,
61  s, m));
62 
63  mpz_clear (m);
64  return res;
65 }
size_t mpz_sizeinbase(const mpz_t u, int base)
Definition: mini-gmp.c:4167
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
const struct nettle_hash nettle_sha256
Definition: sha256-meta.c:41
void nettle_random_func(void *ctx, size_t length, uint8_t *dst)
Definition: nettle-types.h:75
#define pss_encode_mgf1
Definition: pss.h:46
#define rsa_pss_sha256_sign_digest_tr
Definition: rsa.h:82
#define rsa_compute_root_tr
Definition: rsa.h:93
mpz_t n
Definition: rsa.h:121