gnunet-ecc.c File Reference

tool to manipulate EDDSA key files More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_testing_lib.h"
#include <gcrypt.h>

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Go to the source code of this file.

Macros
#define	KEY_STR_LEN   sizeof(struct GNUNET_CRYPTO_EddsaPublicKey) * 8 / 5 + 1
	Number of characters a Base32-encoded public key requires. More...

Functions
static void	create_keys (const char *fn, const char *prefix)
	Create a flat file with a large number of key pairs for testing. More...
static void	print_hex (const char *msg, const void *buf, size_t size)
static void	print_examples_ecdh (void)
static void	print_examples (void)
	Print some random example operations to stdout. More...
static void	print_key (const char *filename)
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. More...
int	main (int argc, char *const *argv)
	Program to manipulate ECC key files. More...

Variables
static int	list_keys
	Flag for listing public key. More...
static unsigned int	list_keys_count
	Flag for listing public key. More...
static int	print_public_key
	Flag for printing public key. More...
static int	print_private_key
	Flag for printing private key. More...
static int	print_public_key_hex
	Flag for printing public key in hex. More...
static int	print_examples_flag
	Flag for printing the output of random example operations. More...
static unsigned int	make_keys
	Option set to create a bunch of keys at once. More...

Detailed Description

tool to manipulate EDDSA key files

Author

Christian Grothoff

Definition in file gnunet-ecc.c.

Macro Definition Documentation

KEY_STR_LEN

#define KEY_STR_LEN   sizeof(struct GNUNET_CRYPTO_EddsaPublicKey) * 8 / 5 + 1

Number of characters a Base32-encoded public key requires.

Definition at line 35 of file gnunet-ecc.c.

Function Documentation

create_keys()

static void create_keys ( const char *  fn, const char *  prefix  )

static

Create a flat file with a large number of key pairs for testing.

Parameters

fn	File name to store the keys.
prefix	Desired prefix for the public keys, NULL if any key is OK.

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

Definition at line 80 of file gnunet-ecc.c.

{
  FILE *f;
  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));
    return;
  }
  if (NULL != prefix)
  {
    len = GNUNET_strlcpy (vanity, prefix, sizeof(vanity));
    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)
    {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, _ ("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, ".");
    GNUNET_CRYPTO_eddsa_key_create (&pk);
    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 (sizeof (struct GNUNET_PeerIdentity) !=
        fwrite (&pk,
                1,
                sizeof (struct GNUNET_PeerIdentity),
                f))
    {
      fprintf (stderr,
               _ ("\nFailed to write to `%s': %s\n"),
               fn,
               strerror (errno));
      break;
    }
  }
  if (UINT_MAX == make_keys)
    fprintf (stderr, _ ("\nFinished!\n"));
  else
    fprintf (stderr, _ ("\nError, %u keys not generated\n"), make_keys);
  fclose (f);
}

References _, GNUNET_assert, GNUNET_CRYPTO_eddsa_key_create(), GNUNET_CRYPTO_eddsa_key_get_public(), GNUNET_CRYPTO_eddsa_public_key_from_string(), GNUNET_CRYPTO_eddsa_public_key_to_string(), GNUNET_free, GNUNET_OK, GNUNET_strlcpy(), KEY_STR_LEN, make_keys, pk, and prefix.

Referenced by run().

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print_hex()

static void print_hex ( const char *  msg, const void *  buf, size_t  size  )

static

Definition at line 193 of file gnunet-ecc.c.

{
  printf ("%s: ", msg);
  for (size_t i = 0; i < size; i++)
  {
    printf ("%02hhx", ((const uint8_t *) buf)[i]);
  }
  printf ("\n");
}

References msg, and size.

Referenced by print_examples_ecdh(), and run().

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print_examples_ecdh()

static void print_examples_ecdh ( void  )

static

Definition at line 205 of file gnunet-ecc.c.

{
  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];
 
  GNUNET_CRYPTO_ecdhe_key_create (&dh_priv1);
  GNUNET_CRYPTO_ecdhe_key_create (&dh_priv2);
  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,
                                                sizeof (dh_priv1),
                                                buf,
                                                sizeof (buf)));
  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,
                                                sizeof (dh_pub1),
                                                buf,
                                                sizeof (buf)));
  printf ("public: %s\n",
          buf);
  print_hex ("public(hex)",
             &dh_pub1,
             sizeof (dh_pub1));
 
  GNUNET_assert (NULL !=
                 GNUNET_STRINGS_data_to_string (&dh_priv2,
                                                sizeof (dh_priv2),
                                                buf,
                                                sizeof (buf)));
  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,
                                                sizeof (dh_pub2),
                                                buf,
                                                sizeof (buf)));
  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,
                                                sizeof (hash),
                                                buf,
                                                sizeof (buf)));
  printf ("ECDH shared secret: %s\n",
          buf);
 
}

References GNUNET_assert, GNUNET_CRYPTO_ecc_ecdh(), GNUNET_CRYPTO_ecdhe_key_create(), GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_OK, GNUNET_STRINGS_data_to_string(), and print_hex().

Referenced by print_examples().

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print_examples()

static void print_examples ( void  )

static

Print some random example operations to stdout.

Definition at line 281 of file gnunet-ecc.c.

{
  print_examples_ecdh ();
  // print_examples_ecdsa ();
  // print_examples_eddsa ();
}

References print_examples_ecdh().

Referenced by run().

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print_key()

static void print_key ( const char *  filename )

static

Definition at line 290 of file gnunet-ecc.c.

{
  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 % sizeof (struct GNUNET_PeerIdentity)))
  {
    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 / sizeof (struct GNUNET_PeerIdentity);
  for (c = 0; (c < total_hostkeys) && (c < list_keys_count); c++)
  {
    GNUNET_memcpy (&private_key,
                   hostkeys_data + (c * sizeof (struct GNUNET_PeerIdentity)),
                   sizeof (struct GNUNET_PeerIdentity));
    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);
}

References _, GNUNET_DISK_FileHandle::fd, filename, fs, GNUNET_CRYPTO_eddsa_key_get_public(), GNUNET_CRYPTO_eddsa_public_key_to_string(), GNUNET_DISK_file_close(), GNUNET_DISK_file_open(), GNUNET_DISK_file_read(), GNUNET_DISK_file_size(), GNUNET_DISK_file_test(), GNUNET_DISK_OPEN_READ, GNUNET_DISK_PERM_NONE, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log_strerror_file, GNUNET_malloc, GNUNET_memcpy, GNUNET_OK, GNUNET_YES, list_keys_count, and GNUNET_PeerIdentity::public_key.

Referenced by run().

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run()

static void run ( void *  cls, char *const *  args, const char *  cfgfile, const struct GNUNET_CONFIGURATION_Handle *  cfg  )

static

Main function that will be run by the scheduler.

Parameters

cls	closure, NULL
args	remaining command-line arguments
cfgfile	name of the configuration file used (for saving, can be NULL!)
cfg	configuration

Definition at line 378 of file gnunet-ecc.c.

{
  (void) cls;
  (void) cfgfile;
  (void) cfg;
 
  if (print_examples_flag)
  {
    print_examples ();
    return;
  }
  if (NULL == args[0])
  {
    fprintf (stderr, "%s", _ ("No hostkey file specified on command line\n"));
    return;
  }
  if (list_keys)
  {
    print_key (args[0]);
    return;
  }
  if (make_keys > 0)
  {
    create_keys (args[0], args[1]);
    return;
  }
  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;
 
    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);
  }
}

References _, warningfilter::args, cfg, create_keys(), GNUNET_CRYPTO_eddsa_key_get_public(), GNUNET_CRYPTO_eddsa_private_key_to_string(), GNUNET_CRYPTO_eddsa_public_key_to_string(), GNUNET_DISK_file_close(), GNUNET_DISK_file_open(), GNUNET_DISK_file_read(), GNUNET_DISK_OPEN_READ, GNUNET_DISK_PERM_NONE, GNUNET_free, list_keys, make_keys, pk, print_examples(), print_examples_flag, print_hex(), print_key(), print_private_key, print_public_key, print_public_key_hex, and pub.

Referenced by main().

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main()

int main	(	int	argc,
		char *const *	argv
	)

Program to manipulate ECC key files.

Parameters

argc	number of arguments from the command line
argv	command line arguments

Returns

0 ok, 1 on error

Definition at line 452 of file gnunet-ecc.c.

{
  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;
 
  list_keys_count = UINT32_MAX;
  ret = (GNUNET_OK ==
         GNUNET_PROGRAM_run (GNUNET_OS_project_data_gnunet (),
                             argc,
                             argv,
                             "gnunet-ecc [OPTIONS] keyfile [VANITY_PREFIX]",
                             gettext_noop (
                               "Manipulate GNUnet private ECC key files"),
                             options,
                             &run,
                             NULL))
        ? 0
        : 1;
  return ret;
}

References gettext_noop, GNUNET_GETOPT_OPTION_END, GNUNET_GETOPT_option_flag(), GNUNET_GETOPT_option_uint(), GNUNET_OK, GNUNET_OS_project_data_gnunet(), GNUNET_PROGRAM_run(), list_keys, list_keys_count, make_keys, options, print_examples_flag, print_private_key, print_public_key, print_public_key_hex, ret, and run().

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Variable Documentation

list_keys

int list_keys

static

Flag for listing public key.

Definition at line 40 of file gnunet-ecc.c.

Referenced by main(), and run().

list_keys_count

unsigned int list_keys_count

static

Flag for listing public key.

Definition at line 45 of file gnunet-ecc.c.

Referenced by main(), and print_key().

print_public_key

int print_public_key

static

Flag for printing public key.

Definition at line 50 of file gnunet-ecc.c.

Referenced by main(), and run().

print_private_key

int print_private_key

static

Flag for printing private key.

Definition at line 55 of file gnunet-ecc.c.

Referenced by main(), and run().

print_public_key_hex

int print_public_key_hex

static

Flag for printing public key in hex.

Definition at line 60 of file gnunet-ecc.c.

Referenced by main(), and run().

print_examples_flag

int print_examples_flag

static

Flag for printing the output of random example operations.

Definition at line 65 of file gnunet-ecc.c.

Referenced by main(), and run().

make_keys

unsigned int make_keys

static

Option set to create a bunch of keys at once.

Definition at line 70 of file gnunet-ecc.c.

Referenced by create_keys(), main(), and run().