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/* nettle-pbkdf2.c
*
* Command-line tool for pbkdf2 hashing. */
/* nettle, low-level cryptographics library
*
* Copyright (C) 2013 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pbkdf2.h"
#include "base16.h"
#include "getopt.h"
#include "misc.h"
#define DEFAULT_ITERATIONS 10000
#define DEFAULT_LENGTH 16
static void
usage (FILE *f)
{
fprintf(f, "nettle-pbkdf2 [OPTIONS] SALT\n"
"Options:\n"
" --help Show this help.\n"
" -V, --version Show version information.\n"
" -i, --iterations=COUNT Desired iteration count (default %d).\n"
" -l, --length=LENGTH Desired output length (octets, default %d)\n"
" --raw Raw binary output.\n"
" --hex-salt Use hex encoding for the salt.\n",
DEFAULT_ITERATIONS, DEFAULT_LENGTH);
}
#define MAX_PASSWORD 1024
int
main (int argc, char **argv)
{
unsigned iterations = DEFAULT_ITERATIONS;
unsigned output_length = DEFAULT_LENGTH;
char password[MAX_PASSWORD];
size_t password_length;
char *output;
size_t salt_length;
char *salt;
int raw = 0;
int hex_salt = 0;
int c;
enum { OPT_HELP = 0x300, OPT_RAW, OPT_HEX_SALT };
static const struct option options[] =
{
/* Name, args, flag, val */
{ "help", no_argument, NULL, OPT_HELP },
{ "version", no_argument, NULL, 'V' },
{ "length", required_argument, NULL, 'l' },
{ "iterations", required_argument, NULL, 'i' },
{ "raw", no_argument, NULL, OPT_RAW },
{ "hex-salt", no_argument, NULL, OPT_HEX_SALT },
{ NULL, 0, NULL, 0 }
};
while ( (c = getopt_long(argc, argv, "Vl:i:", options, NULL)) != -1)
switch (c)
{
default:
abort();
case OPT_HELP:
usage (stdout);
return EXIT_SUCCESS;
case 'V':
printf("nettle-pbkdf2 (" PACKAGE_STRING ")\n");
return EXIT_SUCCESS;
case 'l':
{
int arg;
arg = atoi (optarg);
if (arg <= 0)
die ("Invalid length argument: `%s'\n", optarg);
output_length = arg;
}
break;
case 'i':
{
int arg;
arg = atoi (optarg);
if (arg <= 0)
die ("Invalid iteration count: `%s'\n", optarg);
iterations = arg;
}
break;
case OPT_RAW:
raw = 1;
break;
case OPT_HEX_SALT:
hex_salt = 1;
break;
}
argv += optind;
argc -= optind;
if (argc != 1)
{
usage (stderr);
return EXIT_FAILURE;
}
salt = strdup (argv[0]);
salt_length = strlen(salt);
if (hex_salt)
{
struct base16_decode_ctx base16;
base16_decode_init (&base16);
if (!base16_decode_update (&base16,
&salt_length,
salt, salt_length, salt)
|| !base16_decode_final (&base16))
die ("Invalid salt (expecting hex encoding).\n");
}
password_length = fread (password, 1, sizeof(password), stdin);
if (password_length == sizeof(password))
die ("Password input to long. Current limit is %d characters.\n",
(int) sizeof(password) - 1);
if (ferror (stdin))
die ("Reading password input failed: %s.\n", strerror (errno));
output = xalloc (output_length);
pbkdf2_hmac_sha256 (password_length, password, iterations, salt_length, salt,
output_length, output);
free (salt);
if (raw)
fwrite (output, output_length, 1, stdout);
else
{
unsigned i;
char hex[BASE16_ENCODE_LENGTH(8) + 1];
for (i = 0; i + 8 < output_length; i += 8)
{
base16_encode_update(hex, 8, output + i);
hex[BASE16_ENCODE_LENGTH(8)] = 0;
printf("%s%c", hex, i % 64 == 56 ? '\n' : ' ');
}
base16_encode_update(hex, output_length - i, output + i);
hex[BASE16_ENCODE_LENGTH(output_length - i)] = 0;
printf("%s\n", hex);
}
if (fflush(stdout) != 0 )
die("Write failed: %s\n", STRERROR(errno));
return EXIT_SUCCESS;
}
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