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/* rsa-keygen.c
*
*/
/* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "buffer.h"
#include "rsa.h"
#include "sexp.h"
#include "yarrow.h"
#include "io.h"
#include "getopt.h"
#define KEYSIZE 900
#define ESIZE 30
static void
progress(void *ctx, int c)
{
(void) ctx;
fputc(c, stderr);
}
int
main(int argc, char **argv)
{
struct yarrow256_ctx yarrow;
struct rsa_public_key pub;
struct rsa_private_key priv;
int c;
char *pub_name = NULL;
const char *priv_name = NULL;
const char *random_name = NULL;
struct nettle_buffer pub_buffer;
struct nettle_buffer priv_buffer;
enum { OPT_HELP = 300 };
static const struct option options[] =
{
/* Name, args, flag, val */
{ "help", no_argument, NULL, OPT_HELP },
{ "random", required_argument, NULL, 'r' },
{ NULL, 0, NULL, 0}
};
while ( (c = getopt_long(argc, argv, "o:r:", options, NULL)) != -1)
switch (c)
{
case 'o':
priv_name = optarg;
break;
case 'r':
random_name = optarg;
break;
case OPT_HELP:
printf("FIXME: Usage information.\n");
return EXIT_SUCCESS;
case '?':
return EXIT_FAILURE;
default:
abort();
}
if (!priv_name)
{
werror("No filename provided.\n");
return EXIT_FAILURE;
}
pub_name = xalloc(strlen(priv_name) + 5);
sprintf(pub_name, "%s.pub", priv_name);
/* NOTE: No sources */
yarrow256_init(&yarrow, 0, NULL);
/* Read some data to seed the generator */
if (!simple_random(&yarrow, random_name))
{
werror("Initialization of randomness generator failed.\n");
return EXIT_FAILURE;
}
rsa_public_key_init(&pub);
rsa_private_key_init(&priv);
if (!rsa_generate_keypair
(&pub, &priv,
(void *) &yarrow, (nettle_random_func *) yarrow256_random,
NULL, progress,
KEYSIZE, ESIZE))
{
werror("Key generation failed.\n");
return EXIT_FAILURE;
}
nettle_buffer_init(&priv_buffer);
nettle_buffer_init(&pub_buffer);
if (!rsa_keypair_to_sexp(&pub_buffer, "rsa-pkcs1-sha1", &pub, NULL))
{
werror("Formatting public key failed.\n");
return EXIT_FAILURE;
}
if (!rsa_keypair_to_sexp(&priv_buffer, "rsa-pkcs1-sha1", &pub, &priv))
{
werror("Formatting private key failed.\n");
return EXIT_FAILURE;
}
if (!write_file(pub_name, pub_buffer.size, pub_buffer.contents))
{
werror("Failed to write public key: %s\n",
strerror(errno));
return EXIT_FAILURE;
}
/* NOTE: This doesn't set up paranoid access restrictions on the
* private key file, like a serious key generation tool would do. */
if (!write_file(priv_name, priv_buffer.size, priv_buffer.contents))
{
werror("Failed to write private key: %s\n",
strerror(errno));
return EXIT_FAILURE;
}
nettle_buffer_clear(&priv_buffer);
nettle_buffer_clear(&pub_buffer);
rsa_public_key_clear(&pub);
rsa_private_key_clear(&priv);
free (pub_name);
return EXIT_SUCCESS;
}
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