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Stephen R. van den Berg authoredStephen R. van den Berg authored
rsa_md5.c 2.98 KiB
/* rsa_md5.c
*
* Signatures using RSA and MD5.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Mller
*
* 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
#if HAVE_LIBGMP
#include "rsa.h"
#include "bignum.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
/* Forward declarations */
static void
pkcs1_encode_md5(mpz_t m, unsigned length, struct md5_ctx *hash);
void
rsa_md5_sign(struct rsa_private_key *key,
struct md5_ctx *hash,
mpz_t s)
{
assert(key->size >= 45);
pkcs1_encode_md5(s, key->size - 1, hash);
rsa_compute_root(key, s, s);
}
int
rsa_md5_verify(struct rsa_public_key *key,
struct md5_ctx *hash,
const mpz_t s)
{
int res;
mpz_t m1;
mpz_t m2;
if ( (mpz_sgn(s) <= 0)
|| (mpz_cmp(s, key->n) >= 0) )
return 0;
mpz_init(m1); mpz_init(m2);