/*
This file is part of GNUnet.
- (C) 2012, 2013 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2012, 2013 GNUnet e.V.
- 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 free software: you can redistribute it and/or modify it
+ under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License,
+ 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.
+ Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
- 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.
+ SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file util/gnunet-ecc.c
- * @brief tool to manipulate ECC key files
+ * @brief tool to manipulate EDDSA key files
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_testing_lib.h"
#include <gcrypt.h>
+/**
+ * Number of characters a Base32-encoded public key requires.
+ */
+#define KEY_STR_LEN sizeof(struct GNUNET_CRYPTO_EddsaPublicKey)*8/5+1
+
+/**
+ * Flag for listing public key.
+ */
+static int list_keys;
+
+/**
+ * Flag for listing public key.
+ */
+static unsigned int list_keys_count;
/**
* Flag for printing public key.
static int print_public_key;
/**
- * Flag for printing hash of public key.
+ * Flag for printing private key.
+ */
+static int print_private_key;
+
+/**
+ * Flag for printing public key in hex.
+ */
+static int print_public_key_hex;
+
+/**
+ * Flag for printing the output of random example operations.
*/
-static int print_peer_identity;
+static int print_examples_flag;
/**
* Option set to create a bunch of keys at once.
/**
* Create a flat file with a large number of key pairs for testing.
+ *
+ * @param fn File name to store the keys.
+ * @param prefix Desired prefix for the public keys, NULL if any key is OK.
*/
static void
-create_keys (const char *fn)
+create_keys (const char *fn, const char *prefix)
{
FILE *f;
- struct GNUNET_CRYPTO_EccPrivateKey *pk;
+ struct GNUNET_CRYPTO_EddsaPrivateKey *pk;
+ struct GNUNET_CRYPTO_EddsaPublicKey target_pub;
+ static char vanity[KEY_STR_LEN + 1];
+ size_t len;
+ size_t n;
+ size_t rest;
+ unsigned char mask;
+ unsigned target_byte;
+ char *s;
if (NULL == (f = fopen (fn, "w+")))
{
- fprintf (stderr,
- _("Failed to open `%s': %s\n"),
- fn,
- STRERROR (errno));
+ 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--)
+ if (NULL != prefix)
+ {
+ strncpy (vanity, prefix, KEY_STR_LEN);
+ len = GNUNET_MIN (strlen (prefix), KEY_STR_LEN);
+ n = len * 5 / 8;
+ rest = len * 5 % 8;
+
+ memset (&vanity[len], '0', KEY_STR_LEN - len);
+ vanity[KEY_STR_LEN] = '\0';
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_eddsa_public_key_from_string (vanity,
+ KEY_STR_LEN,
+ &target_pub));
+ if (0 != rest)
+ {
+ /**
+ * Documentation by example:
+ * vanity = "A"
+ * len = 1
+ * n = 5/8 = 0 (bytes)
+ * rest = 5%8 = 5 (bits)
+ * mask = ~(2**(8 - 5) - 1) = ~(2**3 - 1) = ~(8 - 1) = ~b111 = b11111000
+ */
+ mask = ~ ((int)pow (2, 8 - rest) - 1);
+ target_byte = ((unsigned char *) &target_pub)[n] & mask;
+ }
+ else
+ {
+ /* Just so old (debian) versions of GCC calm down with the warnings. */
+ mask = target_byte = 0;
+ }
+ s = GNUNET_CRYPTO_eddsa_public_key_to_string (&target_pub);
+ fprintf (stderr,
+ _("Generating %u keys like %s, please wait"),
+ make_keys,
+ s);
+ GNUNET_free (s);
+ fprintf (stderr,
+ "\nattempt %s [%u, %X]\n",
+ vanity,
+ (unsigned int) n,
+ mask);
+ }
+ else
{
fprintf (stderr,
- ".");
- if (NULL == (pk = GNUNET_CRYPTO_ecc_key_create ()))
+ _("Generating %u keys, please wait"),
+ make_keys);
+ /* Just so old (debian) versions of GCC calm down with the warnings. */
+ n = rest = target_byte = mask = 0;
+ }
+
+ while (0 < make_keys--)
+ {
+ fprintf (stderr, ".");
+ if (NULL == (pk = GNUNET_CRYPTO_eddsa_key_create ()))
{
GNUNET_break (0);
break;
}
+ if (NULL != prefix)
+ {
+ struct GNUNET_CRYPTO_EddsaPublicKey newkey;
+
+ GNUNET_CRYPTO_eddsa_key_get_public (pk, &newkey);
+ if (0 != memcmp (&target_pub, &newkey, n))
+ {
+ make_keys++;
+ continue;
+ }
+ if (0 != rest)
+ {
+ unsigned char new_byte;
+
+ new_byte = ((unsigned char *) &newkey)[n] & mask;
+ if (target_byte != new_byte)
+ {
+ make_keys++;
+ continue;
+ }
+ }
+ }
if (GNUNET_TESTING_HOSTKEYFILESIZE !=
fwrite (pk, 1,
GNUNET_TESTING_HOSTKEYFILESIZE, f))
_("\nFinished!\n"));
else
fprintf (stderr,
- _("\nError, %u keys not generated\n"), make_keys);
+ _("\nError, %u keys not generated\n"),
+ make_keys);
fclose (f);
}
+static void
+print_hex (const char *msg,
+ const void *buf,
+ size_t size)
+{
+ printf ("%s: ", msg);
+ for (size_t i = 0; i < size; i++)
+ {
+ printf ("%02hhx", ((const uint8_t *)buf)[i]);
+ }
+ printf ("\n");
+}
+
+
+static void
+print_examples_ecdh ()
+{
+ struct GNUNET_CRYPTO_EcdhePrivateKey *dh_priv1;
+ struct GNUNET_CRYPTO_EcdhePublicKey *dh_pub1;
+ struct GNUNET_CRYPTO_EcdhePrivateKey *dh_priv2;
+ struct GNUNET_CRYPTO_EcdhePublicKey *dh_pub2;
+ struct GNUNET_HashCode hash;
+ char buf[128];
+
+ dh_pub1 = GNUNET_new (struct GNUNET_CRYPTO_EcdhePublicKey);
+ dh_priv1 = GNUNET_CRYPTO_ecdhe_key_create ();
+ dh_pub2 = GNUNET_new (struct GNUNET_CRYPTO_EcdhePublicKey);
+ dh_priv2 = GNUNET_CRYPTO_ecdhe_key_create ();
+ GNUNET_CRYPTO_ecdhe_key_get_public (dh_priv1, dh_pub1);
+ GNUNET_CRYPTO_ecdhe_key_get_public (dh_priv2, dh_pub2);
+
+ GNUNET_assert (NULL != GNUNET_STRINGS_data_to_string (dh_priv1, 32, buf, 128));
+ printf ("ECDHE key 1:\n");
+ printf ("private: %s\n", buf);
+ print_hex ("private(hex)", dh_priv1, sizeof *dh_priv1);
+ GNUNET_assert (NULL != GNUNET_STRINGS_data_to_string (dh_pub1, 32, buf, 128));
+ printf ("public: %s\n", buf);
+ print_hex ("public(hex)", dh_pub1, sizeof *dh_pub1);
+
+ GNUNET_assert (NULL != GNUNET_STRINGS_data_to_string (dh_priv2, 32, buf, 128));
+ printf ("ECDHE key 2:\n");
+ printf ("private: %s\n", buf);
+ print_hex ("private(hex)", dh_priv2, sizeof *dh_priv2);
+ GNUNET_assert (NULL != GNUNET_STRINGS_data_to_string (dh_pub2, 32, buf, 128));
+ printf ("public: %s\n", buf);
+ print_hex ("public(hex)", dh_pub2, sizeof *dh_pub2);
+
+ GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecc_ecdh (dh_priv1, dh_pub2, &hash));
+ GNUNET_assert (NULL != GNUNET_STRINGS_data_to_string (&hash, 64, buf, 128));
+ printf ("ECDH shared secret: %s\n", buf);
+
+ GNUNET_free (dh_priv1);
+ GNUNET_free (dh_priv2);
+ GNUNET_free (dh_pub1);
+ GNUNET_free (dh_pub2);
+}
+
+
+/**
+ * Print some random example operations to stdout.
+ */
+static void
+print_examples ()
+{
+ print_examples_ecdh ();
+ // print_examples_ecdsa ();
+ // print_examples_eddsa ();
+}
+
+
+static void
+print_key (const char *filename)
+{
+ struct GNUNET_DISK_FileHandle *fd;
+ struct GNUNET_CRYPTO_EddsaPrivateKey private_key;
+ struct GNUNET_CRYPTO_EddsaPublicKey public_key;
+ char *hostkeys_data;
+ char *hostkey_str;
+ uint64_t fs;
+ unsigned int total_hostkeys;
+ unsigned int c;
+ ssize_t sret;
+
+ if (GNUNET_YES !=
+ GNUNET_DISK_file_test (filename))
+ {
+ fprintf (stderr,
+ _("Hostkeys file `%s' not found\n"),
+ filename);
+ return;
+ }
+
+ /* Check hostkey file size, read entire thing into memory */
+ if (GNUNET_OK !=
+ GNUNET_DISK_file_size (filename,
+ &fs,
+ GNUNET_YES,
+ GNUNET_YES))
+ fs = 0;
+ if (0 == fs)
+ {
+ fprintf (stderr,
+ _("Hostkeys file `%s' is empty\n"),
+ filename);
+ return; /* File is empty */
+ }
+ if (0 != (fs % GNUNET_TESTING_HOSTKEYFILESIZE))
+ {
+ fprintf (stderr,
+ _("Incorrect hostkey file format: %s\n"),
+ filename);
+ return;
+ }
+ fd = GNUNET_DISK_file_open (filename,
+ GNUNET_DISK_OPEN_READ,
+ GNUNET_DISK_PERM_NONE);
+ if (NULL == fd)
+ {
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
+ "open",
+ filename);
+ return;
+ }
+ hostkeys_data = GNUNET_malloc (fs);
+ sret = GNUNET_DISK_file_read (fd,
+ hostkeys_data,
+ fs);
+ if ( (sret < 0) ||
+ (fs != (size_t) sret) )
+ {
+ fprintf (stderr,
+ _("Could not read hostkey file: %s\n"),
+ filename);
+ GNUNET_free (hostkeys_data);
+ GNUNET_DISK_file_close (fd);
+ return;
+ }
+ GNUNET_DISK_file_close (fd);
+
+ if (NULL == hostkeys_data)
+ return;
+ total_hostkeys = fs / GNUNET_TESTING_HOSTKEYFILESIZE;
+ for (c = 0; (c < total_hostkeys) && (c < list_keys_count); c++)
+ {
+ GNUNET_memcpy (&private_key,
+ hostkeys_data + (c * GNUNET_TESTING_HOSTKEYFILESIZE),
+ GNUNET_TESTING_HOSTKEYFILESIZE);
+ GNUNET_CRYPTO_eddsa_key_get_public (&private_key, &public_key);
+ hostkey_str = GNUNET_CRYPTO_eddsa_public_key_to_string (&public_key);
+ if (NULL != hostkey_str)
+ {
+ fprintf (stderr, "%4u: %s\n", c, hostkey_str);
+ GNUNET_free (hostkey_str);
+ }
+ else
+ fprintf (stderr, "%4u: %s\n", c, "invalid");
+ }
+ GNUNET_free (hostkeys_data);
+}
+
+
/**
* Main function that will be run by the scheduler.
*
- * @param cls closure
+ * @param cls closure, NULL
* @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,
+run (void *cls,
+ char *const *args,
+ const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
- struct GNUNET_CRYPTO_EccPrivateKey *pk;
- struct GNUNET_CRYPTO_EccPublicSignKey pub;
-
- if (NULL == args[0])
+ (void) cls;
+ (void) cfgfile;
+ (void) cfg;
+
+ if (print_examples_flag)
{
- fprintf (stderr, _("No hostkey file specified on command line\n"));
+ print_examples ();
return;
}
- if (make_keys > 0)
+ if (NULL == args[0])
{
- create_keys (args[0]);
+ FPRINTF (stderr,
+ "%s",
+ _("No hostkey file specified on command line\n"));
return;
}
- pk = GNUNET_CRYPTO_ecc_key_create_from_file (args[0]);
- if (NULL == pk)
+ if (list_keys)
+ {
+ print_key (args[0]);
return;
- if (print_public_key)
+ }
+ if (make_keys > 0)
{
- char *s;
-
- GNUNET_CRYPTO_ecc_key_get_public_for_signature (pk, &pub);
- s = GNUNET_CRYPTO_ecc_public_sign_key_to_string (&pub);
- fprintf (stdout, "%s\n", s);
- GNUNET_free (s);
+ create_keys (args[0], args[1]);
+ return;
}
- if (print_peer_identity)
+ if (print_public_key || print_public_key_hex || print_private_key)
{
char *str;
+ struct GNUNET_DISK_FileHandle *keyfile;
+ struct GNUNET_CRYPTO_EddsaPrivateKey pk;
+ struct GNUNET_CRYPTO_EddsaPublicKey pub;
- GNUNET_CRYPTO_ecc_key_get_public_for_signature (pk, &pub);
- str = GNUNET_CRYPTO_ecc_public_sign_key_to_string (&pub);
- fprintf (stdout,
- "%s\n",
- str);
- GNUNET_free (str);
+ keyfile = GNUNET_DISK_file_open (args[0], GNUNET_DISK_OPEN_READ,
+ GNUNET_DISK_PERM_NONE);
+ if (NULL == keyfile)
+ return;
+ while (sizeof (pk) ==
+ GNUNET_DISK_file_read (keyfile, &pk, sizeof (pk)))
+ {
+ GNUNET_CRYPTO_eddsa_key_get_public (&pk, &pub);
+ if (print_public_key_hex)
+ {
+ print_hex ("HEX:", &pub, sizeof (pub));
+ }
+ else if (print_public_key)
+ {
+ str = GNUNET_CRYPTO_eddsa_public_key_to_string (&pub);
+ FPRINTF (stdout, "%s\n", str);
+ GNUNET_free (str);
+ }
+ else if (print_private_key)
+ {
+ str = GNUNET_CRYPTO_eddsa_private_key_to_string (&pk);
+ FPRINTF (stdout, "%s\n", str);
+ GNUNET_free (str);
+ }
+ }
+ GNUNET_DISK_file_close (keyfile);
}
- GNUNET_free (pk);
+
}
* @return 0 ok, 1 on error
*/
int
-main (int argc, char *const *argv)
+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 },
+ struct GNUNET_GETOPT_CommandLineOption options[] = {
+ GNUNET_GETOPT_option_flag ('i',
+ "iterate",
+ gettext_noop ("list keys included in a file (for testing)"),
+ &list_keys),
+ GNUNET_GETOPT_option_uint ('e',
+ "end=",
+ "COUNT",
+ gettext_noop ("number of keys to list included in a file (for testing)"),
+ &list_keys_count),
+ GNUNET_GETOPT_option_uint ('g',
+ "generate-keys",
+ "COUNT",
+ gettext_noop ("create COUNT public-private key pairs (for testing)"),
+ &make_keys),
+ GNUNET_GETOPT_option_flag ('p',
+ "print-public-key",
+ gettext_noop ("print the public key in ASCII format"),
+ &print_public_key),
+ GNUNET_GETOPT_option_flag ('P',
+ "print-private-key",
+ gettext_noop ("print the private key in ASCII format"),
+ &print_private_key),
+ GNUNET_GETOPT_option_flag ('x',
+ "print-hex",
+ gettext_noop ("print the public key in HEX format"),
+ &print_public_key_hex),
+ GNUNET_GETOPT_option_flag ('E',
+ "examples",
+ gettext_noop ("print examples of ECC operations (used for compatibility testing)"),
+ &print_examples_flag),
GNUNET_GETOPT_OPTION_END
};
int ret;
- if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
+ list_keys_count = UINT32_MAX;
+ 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",
+ GNUNET_PROGRAM_run (argc,
+ argv,
+ "gnunet-ecc [OPTIONS] keyfile [VANITY_PREFIX]",
gettext_noop ("Manipulate GNUnet private ECC key files"),
- options, &run, NULL)) ? 0 : 1;
+ options,
+ &run,
+ NULL)) ? 0 : 1;
GNUNET_free ((void*) argv);
return ret;
}
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