release/src/router/nettle/rsa-sha256-sign.c

   1 /* rsa-sha256-sign.c
   2  *
   3  * Signatures using RSA and SHA256.
   4  */
   5
   6 /* nettle, low-level cryptographics library
   7  *
   8  * Copyright (C) 2001, 2003, 2006 Niels Möller
   9  *
  10  * The nettle library is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * The nettle library is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  18  * License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  23  * MA 02111-1301, USA.
  24  */
  25
  26 #if HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include <assert.h>
  31
  32 #include "rsa.h"
  33
  34 #include "bignum.h"
  35 #include "pkcs1.h"
  36
  37 int
  38 rsa_sha256_sign(const struct rsa_private_key *key,
  39                 struct sha256_ctx *hash,
  40                 mpz_t s)
  41 {
  42   if (pkcs1_rsa_sha256_encode(s, key->size, hash))
  43     {
  44       rsa_compute_root(key, s, s);
  45       return 1;
  46     }
  47   else
  48     {
  49       mpz_set_ui(s, 0);
  50       return 0;
  51     }
  52 }
  53
  54 int
  55 rsa_sha256_sign_digest(const struct rsa_private_key *key,
  56                        const uint8_t *digest,
  57                        mpz_t s)
  58 {
  59   if (pkcs1_rsa_sha256_encode_digest(s, key->size, digest))
  60     {
  61       rsa_compute_root(key, s, s);
  62       return 1;
  63     }
  64   else
  65     {
  66       mpz_set_ui(s, 0);
  67       return 0;
  68     }
  69 }