GNUnet 0.21.2
gnunet-ecc.c
Go to the documentation of this file.
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2012, 2013 GNUnet e.V.
4
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.
9
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.
14
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/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
27#include "platform.h"
28#include "gnunet_util_lib.h"
29#include "gnunet_testing_lib.h"
30#include <gcrypt.h>
31
35#define KEY_STR_LEN sizeof(struct GNUNET_CRYPTO_EddsaPublicKey) * 8 / 5 + 1
36
40static int list_keys;
41
45static unsigned int list_keys_count;
46
51
56
61
66
70static unsigned int make_keys;
71
72
79static void
80create_keys (const char *fn, const char *prefix)
81{
82 FILE *f;
84 struct GNUNET_CRYPTO_EddsaPublicKey target_pub;
85 static char vanity[KEY_STR_LEN + 1];
86 size_t len;
87 size_t n;
88 size_t rest;
89 unsigned char mask;
90 unsigned target_byte;
91 char *s;
92
93 if (NULL == (f = fopen (fn, "w+")))
94 {
95 fprintf (stderr, _ ("Failed to open `%s': %s\n"), fn, strerror (errno));
96 return;
97 }
98 if (NULL != prefix)
99 {
100 len = GNUNET_strlcpy (vanity, prefix, sizeof(vanity));
101 n = len * 5 / 8;
102 rest = len * 5 % 8;
103
104 memset (&vanity[len], '0', KEY_STR_LEN - len);
105 vanity[KEY_STR_LEN] = '\0';
109 &target_pub));
110 if (0 != rest)
111 {mask = ~((int) pow (2, 8 - rest) - 1);
120 target_byte = ((unsigned char *) &target_pub)[n] & mask;
121 }
122 else
123 {
124 /* Just so old (debian) versions of GCC calm down with the warnings. */
125 mask = target_byte = 0;
126 }
128 fprintf (stderr,
129 _ ("Generating %u keys like %s, please wait"),
130 make_keys,
131 s);
132 GNUNET_free (s);
133 fprintf (stderr, "\nattempt %s [%u, %X]\n", vanity, (unsigned int) n, mask);
134 }
135 else
136 {
137 fprintf (stderr, _ ("Generating %u keys, please wait"), make_keys);
138 /* Just so old (debian) versions of GCC calm down with the warnings. */
139 n = rest = target_byte = mask = 0;
140 }
141
142 while (0 < make_keys--)
143 {
144 fprintf (stderr, ".");
146 if (NULL != prefix)
147 {
148 struct GNUNET_CRYPTO_EddsaPublicKey newkey;
149
151 &newkey);
152 if (0 != memcmp (&target_pub,
153 &newkey,
154 n))
155 {
156 make_keys++;
157 continue;
158 }
159 if (0 != rest)
160 {
161 unsigned char new_byte;
162
163 new_byte = ((unsigned char *) &newkey)[n] & mask;
164 if (target_byte != new_byte)
165 {
166 make_keys++;
167 continue;
168 }
169 }
170 }
171 if (sizeof (struct GNUNET_PeerIdentity) !=
172 fwrite (&pk,
173 1,
174 sizeof (struct GNUNET_PeerIdentity),
175 f))
176 {
177 fprintf (stderr,
178 _ ("\nFailed to write to `%s': %s\n"),
179 fn,
180 strerror (errno));
181 break;
182 }
183 }
184 if (UINT_MAX == make_keys)
185 fprintf (stderr, _ ("\nFinished!\n"));
186 else
187 fprintf (stderr, _ ("\nError, %u keys not generated\n"), make_keys);
188 fclose (f);
189}
190
191
192static void
193print_hex (const char *msg, const void *buf, size_t size)
194{
195 printf ("%s: ", msg);
196 for (size_t i = 0; i < size; i++)
197 {
198 printf ("%02hhx", ((const uint8_t *) buf)[i]);
199 }
200 printf ("\n");
201}
202
203
204static void
206{
207 struct GNUNET_CRYPTO_EcdhePrivateKey dh_priv1;
208 struct GNUNET_CRYPTO_EcdhePublicKey dh_pub1;
209 struct GNUNET_CRYPTO_EcdhePrivateKey dh_priv2;
210 struct GNUNET_CRYPTO_EcdhePublicKey dh_pub2;
211 struct GNUNET_HashCode hash;
212 char buf[128];
213
217 &dh_pub1);
219 &dh_pub2);
220
221 GNUNET_assert (NULL !=
223 sizeof (dh_priv1),
224 buf,
225 sizeof (buf)));
226 printf ("ECDHE key 1:\n");
227 printf ("private: %s\n",
228 buf);
229 print_hex ("private(hex)",
230 &dh_priv1, sizeof (dh_priv1));
231 GNUNET_assert (NULL !=
233 sizeof (dh_pub1),
234 buf,
235 sizeof (buf)));
236 printf ("public: %s\n",
237 buf);
238 print_hex ("public(hex)",
239 &dh_pub1,
240 sizeof (dh_pub1));
241
242 GNUNET_assert (NULL !=
244 sizeof (dh_priv2),
245 buf,
246 sizeof (buf)));
247 printf ("ECDHE key 2:\n");
248 printf ("private: %s\n", buf);
249 print_hex ("private(hex)",
250 &dh_priv2,
251 sizeof (dh_priv2));
252 GNUNET_assert (NULL !=
254 sizeof (dh_pub2),
255 buf,
256 sizeof (buf)));
257 printf ("public: %s\n", buf);
258 print_hex ("public(hex)",
259 &dh_pub2,
260 sizeof (dh_pub2));
261
263 GNUNET_CRYPTO_ecc_ecdh (&dh_priv1,
264 &dh_pub2,
265 &hash));
266 GNUNET_assert (NULL !=
268 sizeof (hash),
269 buf,
270 sizeof (buf)));
271 printf ("ECDH shared secret: %s\n",
272 buf);
273
274}
275
276
280static void
282{
284 // print_examples_ecdsa ();
285 // print_examples_eddsa ();
286}
287
288
289static void
290print_key (const char *filename)
291{
293 struct GNUNET_CRYPTO_EddsaPrivateKey private_key;
294 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
295 char *hostkeys_data;
296 char *hostkey_str;
297 uint64_t fs;
298 unsigned int total_hostkeys;
299 unsigned int c;
300 ssize_t sret;
301
303 {
304 fprintf (stderr, _ ("Hostkeys file `%s' not found\n"), filename);
305 return;
306 }
307
308 /* Check hostkey file size, read entire thing into memory */
309 if (GNUNET_OK !=
311 &fs,
313 GNUNET_YES))
314 fs = 0;
315 if (0 == fs)
316 {
317 fprintf (stderr,
318 _ ("Hostkeys file `%s' is empty\n"), filename);
319 return; /* File is empty */
320 }
321 if (0 != (fs % sizeof (struct GNUNET_PeerIdentity)))
322 {
323 fprintf (stderr,
324 _ ("Incorrect hostkey file format: %s\n"),
325 filename);
326 return;
327 }
331 if (NULL == fd)
332 {
334 return;
335 }
336 hostkeys_data = GNUNET_malloc (fs);
337 sret = GNUNET_DISK_file_read (fd, hostkeys_data, fs);
338 if ((sret < 0) || (fs != (size_t) sret))
339 {
340 fprintf (stderr, _ ("Could not read hostkey file: %s\n"), filename);
341 GNUNET_free (hostkeys_data);
343 return;
344 }
346
347 if (NULL == hostkeys_data)
348 return;
349 total_hostkeys = fs / sizeof (struct GNUNET_PeerIdentity);
350 for (c = 0; (c < total_hostkeys) && (c < list_keys_count); c++)
351 {
352 GNUNET_memcpy (&private_key,
353 hostkeys_data + (c * sizeof (struct GNUNET_PeerIdentity)),
354 sizeof (struct GNUNET_PeerIdentity));
357 if (NULL != hostkey_str)
358 {
359 fprintf (stderr, "%4u: %s\n", c, hostkey_str);
360 GNUNET_free (hostkey_str);
361 }
362 else
363 fprintf (stderr, "%4u: %s\n", c, "invalid");
364 }
365 GNUNET_free (hostkeys_data);
366}
367
368
377static void
378run (void *cls,
379 char *const *args,
380 const char *cfgfile,
381 const struct GNUNET_CONFIGURATION_Handle *cfg)
382{
383 (void) cls;
384 (void) cfgfile;
385 (void) cfg;
386
388 {
390 return;
391 }
392 if (NULL == args[0])
393 {
394 fprintf (stderr, "%s", _ ("No hostkey file specified on command line\n"));
395 return;
396 }
397 if (list_keys)
398 {
399 print_key (args[0]);
400 return;
401 }
402 if (make_keys > 0)
403 {
404 create_keys (args[0], args[1]);
405 return;
406 }
408 {
409 char *str;
410 struct GNUNET_DISK_FileHandle *keyfile;
413
414 keyfile = GNUNET_DISK_file_open (args[0],
417 if (NULL == keyfile)
418 return;
419 while (sizeof(pk) == GNUNET_DISK_file_read (keyfile, &pk, sizeof(pk)))
420 {
423 {
424 print_hex ("HEX:", &pub, sizeof(pub));
425 }
426 else if (print_public_key)
427 {
429 fprintf (stdout, "%s\n", str);
430 GNUNET_free (str);
431 }
432 else if (print_private_key)
433 {
435 fprintf (stdout, "%s\n", str);
436 GNUNET_free (str);
437 }
438 }
439 GNUNET_DISK_file_close (keyfile);
440 }
441}
442
443
451int
452main (int argc, char *const *argv)
453{
456 "iterate",
458 "list keys included in a file (for testing)"),
459 &list_keys),
461 'e',
462 "end=",
463 "COUNT",
464 gettext_noop ("number of keys to list included in a file (for testing)"),
467 'g',
468 "generate-keys",
469 "COUNT",
470 gettext_noop ("create COUNT public-private key pairs (for testing)"),
471 &make_keys),
473 "print-public-key",
475 "print the public key in ASCII format"),
478 "print-private-key",
480 "print the private key in ASCII format"),
483 "print-hex",
485 "print the public key in HEX format"),
488 'E',
489 "examples",
491 "print examples of ECC operations (used for compatibility testing)"),
494 int ret;
495
496 list_keys_count = UINT32_MAX;
497 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
498 return 2;
499
500 ret = (GNUNET_OK ==
501 GNUNET_PROGRAM_run (argc,
502 argv,
503 "gnunet-ecc [OPTIONS] keyfile [VANITY_PREFIX]",
505 "Manipulate GNUnet private ECC key files"),
506 options,
507 &run,
508 NULL))
509 ? 0
510 : 1;
511 GNUNET_free_nz ((void *) argv);
512 return ret;
513}
514
515
516/* end of gnunet-ecc.c */
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
#define gettext_noop(String)
Definition: gettext.h:74
static int ret
Final status code.
Definition: gnunet-arm.c:94
static struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
Definition: gnunet-arm.c:109
static int prefix
If printing the value of PREFIX has been requested.
Definition: gnunet-config.c:66
static char * filename
static void print_examples(void)
Print some random example operations to stdout.
Definition: gnunet-ecc.c:281
static int list_keys
Flag for listing public key.
Definition: gnunet-ecc.c:40
#define KEY_STR_LEN
Number of characters a Base32-encoded public key requires.
Definition: gnunet-ecc.c:35
static int print_public_key_hex
Flag for printing public key in hex.
Definition: gnunet-ecc.c:60
static void print_key(const char *filename)
Definition: gnunet-ecc.c:290
static int print_private_key
Flag for printing private key.
Definition: gnunet-ecc.c:55
static unsigned int make_keys
Option set to create a bunch of keys at once.
Definition: gnunet-ecc.c:70
static void print_examples_ecdh(void)
Definition: gnunet-ecc.c:205
static unsigned int list_keys_count
Flag for listing public key.
Definition: gnunet-ecc.c:45
static int print_public_key
Flag for printing public key.
Definition: gnunet-ecc.c:50
static void create_keys(const char *fn, const char *prefix)
Create a flat file with a large number of key pairs for testing.
Definition: gnunet-ecc.c:80
static void print_hex(const char *msg, const void *buf, size_t size)
Definition: gnunet-ecc.c:193
static int print_examples_flag
Flag for printing the output of random example operations.
Definition: gnunet-ecc.c:65
static void run(void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *cfg)
Main function that will be run by the scheduler.
Definition: gnunet-ecc.c:378
int main(int argc, char *const *argv)
Program to manipulate ECC key files.
Definition: gnunet-ecc.c:452
static struct GNUNET_FS_Handle * fs
Handle to FS service.
Definition: gnunet-fs.c:37
struct GNUNET_CRYPTO_PrivateKey pk
Private key from command line option, or NULL.
static struct GNUNET_CRYPTO_EddsaPublicKey pub
Definition: gnunet-scrypt.c:47
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecc_ecdh(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, const struct GNUNET_CRYPTO_EcdhePublicKey *pub, struct GNUNET_HashCode *key_material)
Derive key material from a public and a private ECC key.
Definition: crypto_ecc.c:731
void GNUNET_CRYPTO_ecdhe_key_create(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:453
void GNUNET_CRYPTO_eddsa_key_get_public(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:200
void GNUNET_CRYPTO_eddsa_key_create(struct GNUNET_CRYPTO_EddsaPrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:479
void GNUNET_CRYPTO_ecdhe_key_get_public(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, struct GNUNET_CRYPTO_EcdhePublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:216
struct GNUNET_DISK_FileHandle * GNUNET_DISK_file_open(const char *fn, enum GNUNET_DISK_OpenFlags flags, enum GNUNET_DISK_AccessPermissions perm)
Open a file.
Definition: disk.c:1237
enum GNUNET_GenericReturnValue GNUNET_DISK_file_test(const char *fil)
Check that fil corresponds to a filename (of a file that exists and that is not a directory).
Definition: disk.c:482
enum GNUNET_GenericReturnValue GNUNET_DISK_file_size(const char *filename, uint64_t *size, int include_symbolic_links, int single_file_mode)
Get the size of the file (or directory) of the given file (in bytes).
Definition: disk.c:221
enum GNUNET_GenericReturnValue GNUNET_DISK_file_close(struct GNUNET_DISK_FileHandle *h)
Close an open file.
Definition: disk.c:1308
ssize_t GNUNET_DISK_file_read(const struct GNUNET_DISK_FileHandle *h, void *result, size_t len)
Read the contents of a binary file into a buffer.
Definition: disk.c:622
@ GNUNET_DISK_OPEN_READ
Open the file for reading.
@ GNUNET_DISK_PERM_NONE
Nobody is allowed to do anything to the file.
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_option_uint(char shortName, const char *name, const char *argumentHelp, const char *description, unsigned int *val)
Allow user to specify an unsigned int.
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_option_flag(char shortName, const char *name, const char *description, int *val)
Allow user to specify a flag (which internally means setting an integer to 1/GNUNET_YES/GNUNET_OK.
char * GNUNET_CRYPTO_eddsa_private_key_to_string(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv)
Convert a private key to a string.
Definition: crypto_ecc.c:281
char * GNUNET_CRYPTO_eddsa_public_key_to_string(const struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Convert a public key to a string.
Definition: crypto_ecc.c:254
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_public_key_from_string(const char *enc, size_t enclen, struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Convert a string representing a public key to a public key.
Definition: crypto_ecc.c:360
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
@ GNUNET_OK
@ GNUNET_YES
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_log_strerror_file(level, cmd, filename)
Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the mess...
@ GNUNET_ERROR_TYPE_ERROR
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_free(ptr)
Wrapper around free.
#define GNUNET_free_nz(ptr)
Wrapper around free.
enum GNUNET_GenericReturnValue GNUNET_PROGRAM_run(int argc, char *const *argv, const char *binaryName, const char *binaryHelp, const struct GNUNET_GETOPT_CommandLineOption *options, GNUNET_PROGRAM_Main task, void *task_cls)
Run a standard GNUnet command startup sequence (initialize loggers and configuration,...
Definition: program.c:400
char * GNUNET_STRINGS_data_to_string(const void *data, size_t size, char *out, size_t out_size)
Convert binary data to ASCII encoding using CrockfordBase32.
Definition: strings.c:709
enum GNUNET_GenericReturnValue GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1230
size_t GNUNET_strlcpy(char *dst, const char *src, size_t n)
Like strlcpy but portable.
Definition: strings.c:138
static unsigned int size
Size of the "table".
Definition: peer.c:68
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
Private ECC key encoded for transmission.
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
Private ECC key encoded for transmission.
Public ECC key (always for curve Ed25519) encoded in a format suitable for network transmission and E...
Handle used to access files (and pipes).
int fd
File handle on Unix-like systems.
Definition of a command line option.
A 512-bit hashcode.
The identity of the host (wraps the signing key of the peer).
struct GNUNET_CRYPTO_EddsaPublicKey public_key