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/* rsa-sha256-verify.c
*
* Verifying signatures created with RSA and SHA256.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001, 2003, 2006 Niels Möller
*
* 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., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include "rsa.h"
#include "bignum.h"
#include "pkcs1.h"
int
rsa_sha256_verify(const struct rsa_public_key *key,
struct sha256_ctx *hash,
const mpz_t s)
{
int res;
mpz_t m;
assert(key->size > 0);
mpz_init(m);
res = (pkcs1_rsa_sha256_encode(m, key->size - 1, hash)
&&_rsa_verify(key, m, s));
mpz_clear(m);
return res;
}
int
rsa_sha256_verify_digest(const struct rsa_public_key *key,
const uint8_t *digest,
const mpz_t s)
{
int res;
mpz_t m;
assert(key->size > 0);
mpz_init(m);
res = (pkcs1_rsa_sha256_encode_digest(m, key->size - 1, digest)
&& _rsa_verify(key, m, s));
mpz_clear(m);
return res;
}
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