static dbus_bool_t
generate_and_write_nonce (const DBusString *filename, DBusError *error)
{
DBusString nonce;
dbus_bool_t ret;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
if (!_dbus_string_init (&nonce))
{
dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
return FALSE;
}
if (!_dbus_generate_random_bytes (&nonce, 16))
{
dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
_dbus_string_free (&nonce);
return FALSE;
}
ret = _dbus_string_save_to_file (&nonce, filename, FALSE, error);
_dbus_string_free (&nonce);
return ret;
}
/**
* Generates the given number of random bytes, where the bytes are
* chosen from the alphanumeric ASCII subset.
*
* @param str the string
* @param n_bytes the number of random ASCII bytes to append to string
* @param error location to store reason for failure
* @returns #TRUE on success, #FALSE if no memory or other failure
*/
dbus_bool_t
_dbus_generate_random_ascii (DBusString *str,
int n_bytes,
DBusError *error)
{
static const char letters[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
int i;
int len;
if (!_dbus_generate_random_bytes (str, n_bytes, error))
return FALSE;
len = _dbus_string_get_length (str);
i = len - n_bytes;
while (i < len)
{
_dbus_string_set_byte (str, i,
letters[_dbus_string_get_byte (str, i) %
(sizeof (letters) - 1)]);
++i;
}
_dbus_assert (_dbus_string_validate_ascii (str, len - n_bytes,
n_bytes));
return TRUE;
}
/**
* Fills n_bytes of the given buffer with random bytes.
*
* @param buffer an allocated buffer
* @param n_bytes the number of bytes in buffer to write to
*/
void
_dbus_generate_random_bytes_buffer (char *buffer,
int n_bytes)
{
DBusString str;
if (!_dbus_string_init (&str))
{
_dbus_generate_pseudorandom_bytes_buffer (buffer, n_bytes);
return;
}
if (!_dbus_generate_random_bytes (&str, n_bytes))
{
_dbus_string_free (&str);
_dbus_generate_pseudorandom_bytes_buffer (buffer, n_bytes);
return;
}
_dbus_string_copy_to_buffer (&str, buffer, n_bytes);
_dbus_string_free (&str);
}
/**
* Fills n_bytes of the given buffer with random bytes.
*
* @param buffer an allocated buffer
* @param n_bytes the number of bytes in buffer to write to
* @param error location to store reason for failure
* @returns #TRUE on success
*/
dbus_bool_t
_dbus_generate_random_bytes_buffer (char *buffer,
int n_bytes,
DBusError *error)
{
DBusString str;
if (!_dbus_string_init (&str))
{
_DBUS_SET_OOM (error);
return FALSE;
}
if (!_dbus_generate_random_bytes (&str, n_bytes, error))
{
_dbus_string_free (&str);
return FALSE;
}
_dbus_string_copy_to_buffer (&str, buffer, n_bytes);
_dbus_string_free (&str);
return TRUE;
}