Commit c51f44c9 authored by Niels Möller's avatar Niels Möller

New file.

Rev: src/nettle/examples/rsa-keygen.c:1.1
parent 52c6c8d8
/* rsa-keygen.c
*
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 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 /* HAVE_CONFIG_H */
/* For asprintf */
#define _GNU_SOURCE
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#if !HAVE_LIBGMP
int
main(int argc, char **argv)
{
fprintf(stderr,
"You need to install GMP somewhere where Nettle can find it,\n"
"and recompile Nettle\n");
return EXIT_FAILURE;
}
#endif /* !HAVE_LIBGMP */
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "buffer.h"
#include "rsa.h"
#include "sexp.h"
#include "yarrow.h"
#define KEYSIZE 500
#define ESIZE 30
#define RANDOM_DEVICE "/dev/urandom"
static void
progress(void *ctx, int c)
{
(void) ctx;
fputc(c, stderr);
}
static int
write_file(const char *name, struct nettle_buffer *buffer)
{
const uint8_t *data = buffer->contents;
unsigned length = buffer->size;
int fd = open(name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (fd < 0)
return 0;
while (length)
{
int res = write(fd, data, length);
if (res < 0)
{
if (errno == EINTR)
continue;
else
return 0;
}
data += res;
length -= res;
}
return 1;
}
int
main(int argc, char **argv)
{
struct yarrow256_ctx yarrow;
struct rsa_public_key pub;
struct rsa_private_key priv;
char buf[16];
int fd;
int c;
char *pub_name = NULL;
char *priv_name = NULL;;
struct stat sbuf;
struct nettle_buffer pub_buffer;
struct nettle_buffer priv_buffer;
while ( (c = getopt(argc, argv, "o:")) != -1)
switch (c)
{
case 'o':
priv_name = optarg;
break;
case '?':
if (isprint (optopt))
fprintf(stderr, "Unknown option `-%c'.\n", optopt);
else
fprintf(stderr, "Unknown option character `\\x%x'.\n",
optopt);
return EXIT_FAILURE;
default:
abort();
}
if (!priv_name)
{
fprintf(stderr, "No filename provided.\n");
return EXIT_FAILURE;
}
if (stat(priv_name, &sbuf) == 0)
{
fprintf(stderr, "The output file `%s' already exists.\n", priv_name);
return EXIT_FAILURE;
}
asprintf(&pub_name, "%s.pub", priv_name);
if (!pub_name)
{
fprintf(stderr, "Memory exhausted.\n");
return EXIT_FAILURE;
}
if (stat(pub_name, &sbuf) == 0)
{
fprintf(stderr, "The output file `%s' already exists.\n", pub_name);
return EXIT_FAILURE;
}
/* Read some data to seed the generator */
if ( ( (fd = open(RANDOM_DEVICE, O_RDONLY)) < 0)
|| (sizeof(buf) != read(fd, buf, sizeof(buf))))
{
fprintf(stderr, "Failed to open `%s': %s\n",
RANDOM_DEVICE, strerror(errno));
return EXIT_FAILURE;
}
/* NOTE: No sources */
yarrow256_init(&yarrow, 0, NULL);
yarrow256_seed(&yarrow, sizeof(buf), buf);
rsa_init_public_key(&pub);
rsa_init_private_key(&priv);
if (!rsa_generate_keypair
(&pub, &priv,
(void *) &yarrow, (nettle_random_func) yarrow256_random,
NULL, progress,
KEYSIZE, ESIZE))
{
fprintf(stderr, "Key generation failed.\n");
return EXIT_FAILURE;
}
nettle_buffer_init(&priv_buffer);
nettle_buffer_init(&pub_buffer);
if (!rsa_keypair_to_sexp(&pub_buffer, &pub, NULL))
{
fprintf(stderr, "Formatting public key failed.\n");
return EXIT_FAILURE;
}
if (!rsa_keypair_to_sexp(&pub_buffer, &pub, &priv))
{
fprintf(stderr, "Formatting private key failed.\n");
return EXIT_FAILURE;
}
if (!write_file(pub_name, &pub_buffer))
{
fprintf(stderr, "Failed to write public key: %s\n",
strerror(errno));
return EXIT_FAILURE;
}
if (!write_file(priv_name, &priv_buffer))
{
fprintf(stderr, "Failed to write private key: %s\n",
strerror(errno));
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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