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dsa-keygen.c 2.90 KiB
/* dsa-keygen.c
*
* Generation of DSA keypairs
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 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 <stdlib.h>
#include "dsa.h"
#include "bignum.h"
#include "nettle-internal.h"
/* Valid sizes, according to FIPS 186-3 are (1024, 160), (2048. 224),
(2048, 256), (3072, 256). Currenty, we use only q_bits of 160 or
256. */
int
dsa_generate_keypair(struct dsa_public_key *pub,
struct dsa_private_key *key,
void *random_ctx, nettle_random_func random,
void *progress_ctx, nettle_progress_func progress,
unsigned p_bits, unsigned q_bits)
{
mpz_t p0, p0q, r;
unsigned p0_bits;
unsigned a;
switch (q_bits)
{
case 160:
if (p_bits < DSA_SHA1_MIN_P_BITS)
return 0;
break;
case 256:
if (p_bits < DSA_SHA256_MIN_P_BITS)
return 0;
break;
default:
return 0;
}
mpz_init (p0);
mpz_init (p0q);
mpz_init (r);