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/* rsa-decrypt-tr.c
*
* RSA decryption, using randomized RSA blinding to be more resistant
* to timing attacks.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001, 2012 Niels Möller, 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 "bignum.h"
#include "pkcs1.h"
int
rsa_decrypt_tr(const struct rsa_public_key *pub,
const struct rsa_private_key *key,
void *random_ctx, nettle_random_func *random,
unsigned *length, uint8_t *message,
const mpz_t gibberish)
{
mpz_t m, ri;
int res;
mpz_init_set(m, gibberish);
mpz_init (ri);
_rsa_blind (pub, random_ctx, random, m, ri);
rsa_compute_root(key, m, m);
_rsa_unblind (pub, m, ri);
mpz_clear (ri);
res = pkcs1_decrypt (key->size, m, length, message);
mpz_clear(m);
return res;
}
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