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/* random-prime.c
*
* Command line tool for prime generation.
*
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2010 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 <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "bignum.h"
#include "yarrow.h"
#include "io.h"
#include "getopt.h"
static void
usage(void)
{
fprintf(stderr, "Usage: random-prime [OPTIONS] bits\n\n"
"Options:\n"
" --help Display this message.\n"
" -v, --verbose Display timing information.\n"
" -r, --random FILE Random data to use for seeding.\n");
}
int
main(int argc, char **argv)
{
long bits;
mpz_t p;
struct yarrow256_ctx yarrow;
int verbose = 0;
const char *random_file = NULL;
int c;
char *arg_end;
clock_t start;
clock_t end;
enum { OPT_HELP = 300 };
static const struct option options[] =
{
/* Name, args, flag, val */
{ "help", no_argument, NULL, OPT_HELP },
{ "verbose", no_argument, NULL, 'v' },
{ "random", required_argument, NULL, 'r' },
{ NULL, 0, NULL, 0}
};
while ( (c = getopt_long(argc, argv, "vr:", options, NULL)) != -1)
switch (c)
{
case 'v':
verbose = 1;
break;
case 'r':
random_file = optarg;
break;
case OPT_HELP:
usage();
return EXIT_SUCCESS;
case '?':
return EXIT_FAILURE;
default:
abort();
}
argc -= optind;
argv += optind;
if (argc != 1)
{
usage();
return EXIT_FAILURE;
}
bits = strtol(argv[0], &arg_end, 0);
if (*arg_end || bits < 0)
{
fprintf(stderr, "Invalid number.\n");
return EXIT_FAILURE;
}
if (bits < 3)
{
fprintf(stderr, "Bitsize must be at least 3.\n");
return EXIT_FAILURE;
}
/* NOTE: No sources */
yarrow256_init(&yarrow, 0, NULL);
/* Read some data to seed the generator */
if (!simple_random(&yarrow, random_file))
{
werror("Initialization of randomness generator failed.\n");
return EXIT_FAILURE;
}
mpz_init(p);
start = clock();
nettle_random_prime(p, bits, 0,
&yarrow, (nettle_random_func *) yarrow256_random,
NULL, NULL);
end = clock();
mpz_out_str(stdout, 10, p);
printf("\n");
if (verbose)
fprintf(stderr, "time: %.3g s\n",
(double)(end - start) / CLOCKS_PER_SEC);
return EXIT_SUCCESS;
}
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