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/* rsa-pkcs1-sign-tr.c
*
* Creating timing resistant RSA signatures.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2012 Nikos Mavrogiannopoulos
*
* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "rsa.h"
#include "pkcs1.h"
int
rsa_pkcs1_sign_tr(const struct rsa_public_key *pub,
const struct rsa_private_key *key,
void *random_ctx, nettle_random_func *random,
unsigned length, const uint8_t *digest_info,
mpz_t s)
{
mpz_t ri;
if (pkcs1_rsa_digest_encode (s, key->size, length, digest_info))
{
mpz_init (ri);
_rsa_blind (pub, random_ctx, random, s, ri);
rsa_compute_root(key, s, s);
_rsa_unblind (pub, s, ri);
mpz_clear (ri);
return 1;
}
else
{
mpz_set_ui(s, 0);
return 0;
}
}
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