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/*
This file is part of GNUnet.
(C) 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file util/gnunet-ecc.c
* @brief tool to manipulate ECC key files
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_testing_lib.h"
#include <gcrypt.h>
/**
* Flag for printing public key.
*/
static int print_public_key;
/**
* Flag for printing hash of public key.
*/
static int print_peer_identity;
/**
* Flag for printing short hash of public key.
*/
static int print_short_identity;
/**
* Use weak random number generator for key generation.
*/
static int weak_random;
/**
* Option set to create a bunch of keys at once.
*/
static unsigned int make_keys;
/**
* The private information of an ECC key pair.
* NOTE: this must match the definition in crypto_ksk.c and crypto_ecc.c!
*/
struct GNUNET_CRYPTO_EccPrivateKey
{
gcry_sexp_t sexp;
};
/**
* Create a new private key. Caller must free return value.
*
* @return fresh private key
*/
static struct GNUNET_CRYPTO_EccPrivateKey *
ecc_key_create ()
{
struct GNUNET_CRYPTO_EccPrivateKey *ret;
gcry_sexp_t s_key;
gcry_sexp_t s_keyparam;
GNUNET_assert (0 ==
gcry_sexp_build (&s_keyparam, NULL,
"(genkey(ecc(nbits %d)(ecc-use-e 3:257)))",
2048));
GNUNET_assert (0 == gcry_pk_genkey (&s_key, s_keyparam));
gcry_sexp_release (s_keyparam);
#if EXTRA_CHECKS
GNUNET_assert (0 == gcry_pk_testkey (s_key));
#endif
ret = GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccPrivateKey));
ret->sexp = s_key;
return ret;
}
/**
* Create a flat file with a large number of key pairs for testing.
*/
static void
create_keys (const char *fn)
{
FILE *f;
struct GNUNET_CRYPTO_EccPrivateKey *pk;
struct GNUNET_CRYPTO_EccPrivateKeyBinaryEncoded *enc;
if (NULL == (f = fopen (fn, "w+")))
{
fprintf (stderr,
_("Failed to open `%s': %s\n"),
fn,
STRERROR (errno));
return;
}
fprintf (stderr,
_("Generating %u keys, please wait"),
make_keys);
while (0 < make_keys--)
{
fprintf (stderr,
".");
if (NULL == (pk = ecc_key_create ()))
{
GNUNET_break (0);
break;
}
enc = GNUNET_CRYPTO_ecc_encode_key (pk);
if (htons (enc->size) != fwrite (enc, 1, htons (enc->size), f))
{
fprintf (stderr,
_("\nFailed to write to `%s': %s\n"),
fn,
STRERROR (errno));
GNUNET_CRYPTO_ecc_key_free (pk);
GNUNET_free (enc);
break;
}
GNUNET_CRYPTO_ecc_key_free (pk);
GNUNET_free (enc);
}
if (0 == make_keys)
fprintf (stderr,
_("Finished!\n"));
fclose (f);
}
/**
* Main function that will be run by the scheduler.
*
* @param cls closure
* @param args remaining command-line arguments
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param cfg configuration
*/
static void
run (void *cls, char *const *args, const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_CRYPTO_EccPrivateKey *pk;
struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded pub;
struct GNUNET_PeerIdentity pid;
if (NULL == args[0])
{
fprintf (stderr, _("No hostkey file specified on command line\n"));
return;
}
if (0 != weak_random)
GNUNET_CRYPTO_random_disable_entropy_gathering ();
if (make_keys > 0)
{
create_keys (args[0]);
return;
}
pk = GNUNET_CRYPTO_ecc_key_create_from_file (args[0]);
if (NULL == pk)
return;
if (print_public_key)
{
char *s;
GNUNET_CRYPTO_ecc_key_get_public (pk, &pub);
s = GNUNET_CRYPTO_ecc_public_key_to_string (&pub);
fprintf (stdout, "%s\n", s);
GNUNET_free (s);
}
if (print_peer_identity)
{
struct GNUNET_CRYPTO_HashAsciiEncoded enc;
GNUNET_CRYPTO_ecc_key_get_public (pk, &pub);
GNUNET_CRYPTO_hash (&pub, sizeof (pub), &pid.hashPubKey);
GNUNET_CRYPTO_hash_to_enc (&pid.hashPubKey, &enc);
fprintf (stdout, "%s\n", enc.encoding);
}
if (print_short_identity)
{
struct GNUNET_CRYPTO_ShortHashAsciiEncoded enc;
struct GNUNET_CRYPTO_ShortHashCode sh;
GNUNET_CRYPTO_ecc_key_get_public (pk, &pub);
GNUNET_CRYPTO_short_hash (&pub, sizeof (pub), &sh);
GNUNET_CRYPTO_short_hash_to_enc (&sh, &enc);
fprintf (stdout, "%s\n", enc.short_encoding);
}
GNUNET_CRYPTO_ecc_key_free (pk);
}
/**
* Program to manipulate ECC key files.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc, char *const *argv)
{
static const struct GNUNET_GETOPT_CommandLineOption options[] = {
{ 'g', "generate-keys", "COUNT",
gettext_noop ("create COUNT public-private key pairs (for testing)"),
1, &GNUNET_GETOPT_set_uint, &make_keys },
{ 'p', "print-public-key", NULL,
gettext_noop ("print the public key in ASCII format"),
0, &GNUNET_GETOPT_set_one, &print_public_key },
{ 'P', "print-peer-identity", NULL,
gettext_noop ("print the hash of the public key in ASCII format"),
0, &GNUNET_GETOPT_set_one, &print_peer_identity },
{ 's', "print-short-identity", NULL,
gettext_noop ("print the short hash of the public key in ASCII format"),
0, &GNUNET_GETOPT_set_one, &print_short_identity },
{ 'w', "weak-random", NULL,
gettext_noop ("use insecure, weak random number generator for key generation (for testing only)"),
0, &GNUNET_GETOPT_set_one, &weak_random },
GNUNET_GETOPT_OPTION_END
};
int ret;
if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
return 2;
ret = (GNUNET_OK ==
GNUNET_PROGRAM_run (argc, argv, "gnunet-ecc [OPTIONS] keyfile",
gettext_noop ("Manipulate GNUnet private ECC key files"),
options, &run, NULL)) ? 0 : 1;
GNUNET_free ((void*) argv);
return ret;
}
/* end of gnunet-ecc.c */
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