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<?php
/**
*
* @package phpBB3
* @copyright (c) 2013 phpBB Group
* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
exit;
}
/**
* @package passwords
*/
class phpbb_passwords_driver_helper
{
/**
* base64 alphabet
* @var string
*/
public $itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
/**
* Base64 encode hash
*
* @param string $input Input string
* @param int $count Input string length
*
* @return string base64 encoded string
*/
public function hash_encode64($input, $count)
{
$output = '';
$i = 0;
do
{
$value = ord($input[$i++]);
$output .= $this->itoa64[$value & 0x3f];
if ($i < $count)
{
$value |= ord($input[$i]) << 8;
}
$output .= $this->itoa64[($value >> 6) & 0x3f];
if ($i++ >= $count)
{
break;
}
if ($i < $count)
{
$value |= ord($input[$i]) << 16;
}
$output .= $this->itoa64[($value >> 12) & 0x3f];
if ($i++ >= $count)
{
break;
}
$output .= $this->itoa64[($value >> 18) & 0x3f];
}
while ($i < $count);
return $output;
}
/**
* Return unique id
* @param string $extra additional entropy
*
* @return string Unique id
*/
public function unique_id($extra = 'c')
{
static $dss_seeded = false;
global $config;
$val = $config['rand_seed'] . microtime();
$val = md5($val);
$config['rand_seed'] = md5($config['rand_seed'] . $val . $extra);
if ($dss_seeded !== true && ($config['rand_seed_last_update'] < time() - rand(1,10)))
{
set_config('rand_seed_last_update', time(), true);
set_config('rand_seed', $config['rand_seed'], true);
$dss_seeded = true;
}
return substr($val, 4, 16);
}
/**
* Get random salt with specified length
*
* @param int $length Salt length
*/
public function get_random_salt($length)
{
$random = '';
if (($fh = @fopen('/dev/urandom', 'rb')))
{
$random = fread($fh, $length);
fclose($fh);
}
if (strlen($random) < $length)
{
$random = '';
$random_state = $this->unique_id();
for ($i = 0; $i < $length; $i += 16)
{
$random_state = md5($this->unique_id() . $random_state);
$random .= pack('H*', md5($random_state));
}
$random = substr($random, 0, $length);
}
return $random;
}
}
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