2 This file is part of GNUnet.
3 Copyright (C) 2012, 2013 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @file util/gnunet-ecc.c
23 * @brief tool to manipulate EDDSA key files
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_testing_lib.h"
32 * Number of characters a Base32-encoded public key requires.
34 #define KEY_STR_LEN sizeof(struct GNUNET_CRYPTO_EddsaPublicKey)*8/5+1
37 * Flag for listing public key.
42 * Flag for listing public key.
44 static unsigned int list_keys_count;
47 * Flag for printing public key.
49 static int print_public_key;
52 * Flag for printing private key.
54 static int print_private_key;
57 * Flag for printing public key in hex.
59 static int print_public_key_hex;
62 * Flag for printing the output of random example operations.
64 static int print_examples_flag;
67 * Option set to create a bunch of keys at once.
69 static unsigned int make_keys;
73 * Create a flat file with a large number of key pairs for testing.
75 * @param fn File name to store the keys.
76 * @param prefix Desired prefix for the public keys, NULL if any key is OK.
79 create_keys (const char *fn, const char *prefix)
82 struct GNUNET_CRYPTO_EddsaPrivateKey *pk;
83 struct GNUNET_CRYPTO_EddsaPublicKey target_pub;
84 static char vanity[KEY_STR_LEN + 1];
92 if (NULL == (f = fopen (fn, "w+")))
94 fprintf (stderr, _("Failed to open `%s': %s\n"), fn, STRERROR (errno));
99 len = GNUNET_strlcpy (vanity, prefix, sizeof (vanity));
103 memset (&vanity[len], '0', KEY_STR_LEN - len);
104 vanity[KEY_STR_LEN] = '\0';
105 GNUNET_assert (GNUNET_OK ==
106 GNUNET_CRYPTO_eddsa_public_key_from_string (vanity,
112 * Documentation by example:
115 * n = 5/8 = 0 (bytes)
116 * rest = 5%8 = 5 (bits)
117 * mask = ~(2**(8 - 5) - 1) = ~(2**3 - 1) = ~(8 - 1) = ~b111 = b11111000
119 mask = ~ ((int)pow (2, 8 - rest) - 1);
120 target_byte = ((unsigned char *) &target_pub)[n] & mask;
124 /* Just so old (debian) versions of GCC calm down with the warnings. */
125 mask = target_byte = 0;
127 s = GNUNET_CRYPTO_eddsa_public_key_to_string (&target_pub);
129 _("Generating %u keys like %s, please wait"),
134 "\nattempt %s [%u, %X]\n",
142 _("Generating %u keys, please wait"),
144 /* Just so old (debian) versions of GCC calm down with the warnings. */
145 n = rest = target_byte = mask = 0;
148 while (0 < make_keys--)
150 fprintf (stderr, ".");
151 if (NULL == (pk = GNUNET_CRYPTO_eddsa_key_create ()))
158 struct GNUNET_CRYPTO_EddsaPublicKey newkey;
160 GNUNET_CRYPTO_eddsa_key_get_public (pk, &newkey);
161 if (0 != memcmp (&target_pub, &newkey, n))
168 unsigned char new_byte;
170 new_byte = ((unsigned char *) &newkey)[n] & mask;
171 if (target_byte != new_byte)
178 if (GNUNET_TESTING_HOSTKEYFILESIZE !=
180 GNUNET_TESTING_HOSTKEYFILESIZE, f))
183 _("\nFailed to write to `%s': %s\n"),
191 if (UINT_MAX == make_keys)
196 _("\nError, %u keys not generated\n"),
203 print_hex (const char *msg,
207 printf ("%s: ", msg);
208 for (size_t i = 0; i < size; i++)
210 printf ("%02hhx", ((const uint8_t *)buf)[i]);
217 print_examples_ecdh ()
219 struct GNUNET_CRYPTO_EcdhePrivateKey *dh_priv1;
220 struct GNUNET_CRYPTO_EcdhePublicKey *dh_pub1;
221 struct GNUNET_CRYPTO_EcdhePrivateKey *dh_priv2;
222 struct GNUNET_CRYPTO_EcdhePublicKey *dh_pub2;
223 struct GNUNET_HashCode hash;
226 dh_pub1 = GNUNET_new (struct GNUNET_CRYPTO_EcdhePublicKey);
227 dh_priv1 = GNUNET_CRYPTO_ecdhe_key_create ();
228 dh_pub2 = GNUNET_new (struct GNUNET_CRYPTO_EcdhePublicKey);
229 dh_priv2 = GNUNET_CRYPTO_ecdhe_key_create ();
230 GNUNET_CRYPTO_ecdhe_key_get_public (dh_priv1, dh_pub1);
231 GNUNET_CRYPTO_ecdhe_key_get_public (dh_priv2, dh_pub2);
233 GNUNET_assert (NULL != GNUNET_STRINGS_data_to_string (dh_priv1, 32, buf, 128));
234 printf ("ECDHE key 1:\n");
235 printf ("private: %s\n", buf);
236 print_hex ("private(hex)", dh_priv1, sizeof *dh_priv1);
237 GNUNET_assert (NULL != GNUNET_STRINGS_data_to_string (dh_pub1, 32, buf, 128));
238 printf ("public: %s\n", buf);
239 print_hex ("public(hex)", dh_pub1, sizeof *dh_pub1);
241 GNUNET_assert (NULL != GNUNET_STRINGS_data_to_string (dh_priv2, 32, buf, 128));
242 printf ("ECDHE key 2:\n");
243 printf ("private: %s\n", buf);
244 print_hex ("private(hex)", dh_priv2, sizeof *dh_priv2);
245 GNUNET_assert (NULL != GNUNET_STRINGS_data_to_string (dh_pub2, 32, buf, 128));
246 printf ("public: %s\n", buf);
247 print_hex ("public(hex)", dh_pub2, sizeof *dh_pub2);
249 GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecc_ecdh (dh_priv1, dh_pub2, &hash));
250 GNUNET_assert (NULL != GNUNET_STRINGS_data_to_string (&hash, 64, buf, 128));
251 printf ("ECDH shared secret: %s\n", buf);
253 GNUNET_free (dh_priv1);
254 GNUNET_free (dh_priv2);
255 GNUNET_free (dh_pub1);
256 GNUNET_free (dh_pub2);
261 * Print some random example operations to stdout.
266 print_examples_ecdh ();
267 // print_examples_ecdsa ();
268 // print_examples_eddsa ();
273 print_key (const char *filename)
275 struct GNUNET_DISK_FileHandle *fd;
276 struct GNUNET_CRYPTO_EddsaPrivateKey private_key;
277 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
281 unsigned int total_hostkeys;
286 GNUNET_DISK_file_test (filename))
289 _("Hostkeys file `%s' not found\n"),
294 /* Check hostkey file size, read entire thing into memory */
296 GNUNET_DISK_file_size (filename,
304 _("Hostkeys file `%s' is empty\n"),
306 return; /* File is empty */
308 if (0 != (fs % GNUNET_TESTING_HOSTKEYFILESIZE))
311 _("Incorrect hostkey file format: %s\n"),
315 fd = GNUNET_DISK_file_open (filename,
316 GNUNET_DISK_OPEN_READ,
317 GNUNET_DISK_PERM_NONE);
320 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
325 hostkeys_data = GNUNET_malloc (fs);
326 sret = GNUNET_DISK_file_read (fd,
330 (fs != (size_t) sret) )
333 _("Could not read hostkey file: %s\n"),
335 GNUNET_free (hostkeys_data);
336 GNUNET_DISK_file_close (fd);
339 GNUNET_DISK_file_close (fd);
341 if (NULL == hostkeys_data)
343 total_hostkeys = fs / GNUNET_TESTING_HOSTKEYFILESIZE;
344 for (c = 0; (c < total_hostkeys) && (c < list_keys_count); c++)
346 GNUNET_memcpy (&private_key,
347 hostkeys_data + (c * GNUNET_TESTING_HOSTKEYFILESIZE),
348 GNUNET_TESTING_HOSTKEYFILESIZE);
349 GNUNET_CRYPTO_eddsa_key_get_public (&private_key, &public_key);
350 hostkey_str = GNUNET_CRYPTO_eddsa_public_key_to_string (&public_key);
351 if (NULL != hostkey_str)
353 fprintf (stderr, "%4u: %s\n", c, hostkey_str);
354 GNUNET_free (hostkey_str);
357 fprintf (stderr, "%4u: %s\n", c, "invalid");
359 GNUNET_free (hostkeys_data);
364 * Main function that will be run by the scheduler.
366 * @param cls closure, NULL
367 * @param args remaining command-line arguments
368 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
369 * @param cfg configuration
375 const struct GNUNET_CONFIGURATION_Handle *cfg)
381 if (print_examples_flag)
390 _("No hostkey file specified on command line\n"));
400 create_keys (args[0], args[1]);
403 if (print_public_key || print_public_key_hex || print_private_key)
406 struct GNUNET_DISK_FileHandle *keyfile;
407 struct GNUNET_CRYPTO_EddsaPrivateKey pk;
408 struct GNUNET_CRYPTO_EddsaPublicKey pub;
410 keyfile = GNUNET_DISK_file_open (args[0], GNUNET_DISK_OPEN_READ,
411 GNUNET_DISK_PERM_NONE);
414 while (sizeof (pk) ==
415 GNUNET_DISK_file_read (keyfile, &pk, sizeof (pk)))
417 GNUNET_CRYPTO_eddsa_key_get_public (&pk, &pub);
418 if (print_public_key_hex)
420 print_hex ("HEX:", &pub, sizeof (pub));
422 else if (print_public_key)
424 str = GNUNET_CRYPTO_eddsa_public_key_to_string (&pub);
425 FPRINTF (stdout, "%s\n", str);
428 else if (print_private_key)
430 str = GNUNET_CRYPTO_eddsa_private_key_to_string (&pk);
431 FPRINTF (stdout, "%s\n", str);
435 GNUNET_DISK_file_close (keyfile);
442 * Program to manipulate ECC key files.
444 * @param argc number of arguments from the command line
445 * @param argv command line arguments
446 * @return 0 ok, 1 on error
452 struct GNUNET_GETOPT_CommandLineOption options[] = {
453 GNUNET_GETOPT_option_flag ('i',
455 gettext_noop ("list keys included in a file (for testing)"),
457 GNUNET_GETOPT_option_uint ('e',
460 gettext_noop ("number of keys to list included in a file (for testing)"),
462 GNUNET_GETOPT_option_uint ('g',
465 gettext_noop ("create COUNT public-private key pairs (for testing)"),
467 GNUNET_GETOPT_option_flag ('p',
469 gettext_noop ("print the public key in ASCII format"),
471 GNUNET_GETOPT_option_flag ('P',
473 gettext_noop ("print the private key in ASCII format"),
475 GNUNET_GETOPT_option_flag ('x',
477 gettext_noop ("print the public key in HEX format"),
478 &print_public_key_hex),
479 GNUNET_GETOPT_option_flag ('E',
481 gettext_noop ("print examples of ECC operations (used for compatibility testing)"),
482 &print_examples_flag),
483 GNUNET_GETOPT_OPTION_END
487 list_keys_count = UINT32_MAX;
489 GNUNET_STRINGS_get_utf8_args (argc, argv,
494 GNUNET_PROGRAM_run (argc,
496 "gnunet-ecc [OPTIONS] keyfile [VANITY_PREFIX]",
497 gettext_noop ("Manipulate GNUnet private ECC key files"),
501 GNUNET_free ((void*) argv);
505 /* end of gnunet-ecc.c */