GNUnet  0.19.3
gnunet-ecc.c
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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 
40 static int list_keys;
41 
45 static unsigned int list_keys_count;
46 
50 static int print_public_key;
51 
55 static int print_private_key;
56 
61 
66 
70 static unsigned int make_keys;
71 
72 
79 static void
80 create_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';
108  KEY_STR_LEN,
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  }
172  fwrite (&pk,
173  1,
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 
192 static void
193 print_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 
204 static 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 
214  GNUNET_CRYPTO_ecdhe_key_create (&dh_priv1);
215  GNUNET_CRYPTO_ecdhe_key_create (&dh_priv2);
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 
280 static void
282 {
284  // print_examples_ecdsa ();
285  // print_examples_eddsa ();
286 }
287 
288 
289 static void
290 print_key (const char *filename)
291 {
292  struct GNUNET_DISK_FileHandle *fd;
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 = 0;
312  if (0 == fs)
313  {
314  fprintf (stderr, _ ("Hostkeys file `%s' is empty\n"), filename);
315  return; /* File is empty */
316  }
317  if (0 != (fs % GNUNET_TESTING_HOSTKEYFILESIZE))
318  {
319  fprintf (stderr, _ ("Incorrect hostkey file format: %s\n"), filename);
320  return;
321  }
325  if (NULL == fd)
326  {
328  return;
329  }
331  sret = GNUNET_DISK_file_read (fd, hostkeys_data, fs);
332  if ((sret < 0) || (fs != (size_t) sret))
333  {
334  fprintf (stderr, _ ("Could not read hostkey file: %s\n"), filename);
337  return;
338  }
340 
341  if (NULL == hostkeys_data)
342  return;
343  total_hostkeys = fs / GNUNET_TESTING_HOSTKEYFILESIZE;
344  for (c = 0; (c < total_hostkeys) && (c < list_keys_count); c++)
345  {
346  GNUNET_memcpy (&private_key,
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)
352  {
353  fprintf (stderr, "%4u: %s\n", c, hostkey_str);
354  GNUNET_free (hostkey_str);
355  }
356  else
357  fprintf (stderr, "%4u: %s\n", c, "invalid");
358  }
360 }
361 
362 
371 static void
372 run (void *cls,
373  char *const *args,
374  const char *cfgfile,
375  const struct GNUNET_CONFIGURATION_Handle *cfg)
376 {
377  (void) cls;
378  (void) cfgfile;
379  (void) cfg;
380 
382  {
383  print_examples ();
384  return;
385  }
386  if (NULL == args[0])
387  {
388  fprintf (stderr, "%s", _ ("No hostkey file specified on command line\n"));
389  return;
390  }
391  if (list_keys)
392  {
393  print_key (args[0]);
394  return;
395  }
396  if (make_keys > 0)
397  {
398  create_keys (args[0], args[1]);
399  return;
400  }
402  {
403  char *str;
404  struct GNUNET_DISK_FileHandle *keyfile;
407 
408  keyfile = GNUNET_DISK_file_open (args[0],
411  if (NULL == keyfile)
412  return;
413  while (sizeof(pk) == GNUNET_DISK_file_read (keyfile, &pk, sizeof(pk)))
414  {
417  {
418  print_hex ("HEX:", &pub, sizeof(pub));
419  }
420  else if (print_public_key)
421  {
423  fprintf (stdout, "%s\n", str);
424  GNUNET_free (str);
425  }
426  else if (print_private_key)
427  {
429  fprintf (stdout, "%s\n", str);
430  GNUNET_free (str);
431  }
432  }
433  GNUNET_DISK_file_close (keyfile);
434  }
435 }
436 
437 
445 int
446 main (int argc, char *const *argv)
447 {
450  "iterate",
451  gettext_noop (
452  "list keys included in a file (for testing)"),
453  &list_keys),
455  'e',
456  "end=",
457  "COUNT",
458  gettext_noop ("number of keys to list included in a file (for testing)"),
459  &list_keys_count),
461  'g',
462  "generate-keys",
463  "COUNT",
464  gettext_noop ("create COUNT public-private key pairs (for testing)"),
465  &make_keys),
467  "print-public-key",
468  gettext_noop (
469  "print the public key in ASCII format"),
472  "print-private-key",
473  gettext_noop (
474  "print the private key in ASCII format"),
477  "print-hex",
478  gettext_noop (
479  "print the public key in HEX format"),
482  'E',
483  "examples",
484  gettext_noop (
485  "print examples of ECC operations (used for compatibility testing)"),
488  int ret;
489 
490  list_keys_count = UINT32_MAX;
491  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
492  return 2;
493 
494  ret = (GNUNET_OK ==
495  GNUNET_PROGRAM_run (argc,
496  argv,
497  "gnunet-ecc [OPTIONS] keyfile [VANITY_PREFIX]",
498  gettext_noop (
499  "Manipulate GNUnet private ECC key files"),
500  options,
501  &run,
502  NULL))
503  ? 0
504  : 1;
505  GNUNET_free_nz ((void *) argv);
506  return ret;
507 }
508 
509 
510 /* 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:70
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-abd.c:36
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
static int prefix
If printing the value of PREFIX has been requested.
Definition: gnunet-config.c:59
static void * hostkeys_data
The hostkeys data.
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:372
int main(int argc, char *const *argv)
Program to manipulate ECC key files.
Definition: gnunet-ecc.c:446
static struct GNUNET_FS_Handle * fs
Handle to FS service.
Definition: gnunet-fs.c:37
uint16_t len
length of data (which is always a uint32_t, but presumably this can be used to specify that fewer byt...
struct GNUNET_IDENTITY_PrivateKey pk
Private key from command line option, or NULL.
static struct GNUNET_CRYPTO_EddsaPublicKey pub
Definition: gnunet-scrypt.c:47
static char buf[2048]
Convenience API for writing testcases for GNUnet.
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:726
void GNUNET_CRYPTO_ecdhe_key_create(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:435
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:197
void GNUNET_CRYPTO_eddsa_key_create(struct GNUNET_CRYPTO_EddsaPrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:461
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:213
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:1234
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:481
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:1305
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:621
@ 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_public_key_to_string(const struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Convert a public key to a string.
Definition: crypto_ecc.c:251
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:357
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
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:278
@ 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:708
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:1222
size_t GNUNET_strlcpy(char *dst, const char *src, size_t n)
Like strlcpy but portable.
Definition: strings.c:138
#define GNUNET_TESTING_HOSTKEYFILESIZE
Size of each hostkey in the hostkey file (in BYTES).
static unsigned int size
Size of the "table".
Definition: peer.c:68
#define _(String)
GNU gettext support macro.
Definition: platform.h:177
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.