/**
* Generate a random string of the specified size
*
* @param int $size The size of the requested random string
*
* @return string A string of the requested size
*/
public function generate($size)
{
$result = '';
while (Util::safeStrlen($result) < $size) {
$result = uniqid($result, true);
}
return Util::safeSubstr($result, 0, $size);
}
public function __construct()
{
$state = self::$state;
if (function_exists('posix_times')) {
$state .= serialize(posix_times());
}
if (!defined('HHVM_VERSION') && function_exists('zend_thread_id')) {
$state .= zend_thread_id();
}
if (function_exists('hphp_get_thread_id')) {
$state .= hphp_get_thread_id();
}
$state .= getmypid() . memory_get_usage();
$state .= serialize($_ENV);
$state .= serialize($_SERVER);
$state .= count(debug_backtrace(false));
self::$state = hash('sha512', $state, true);
if (is_null(self::$counter)) {
list(, self::$counter) = unpack("i", Util::safeSubstr(self::$state, 0, 4));
$seed = $this->generate(Util::safeStrlen(dechex(PHP_INT_MAX)));
list(, self::$counter) = unpack("i", $seed);
}
}
/**
* Get the block size (the size of the individual blocks used for the mixing)
*
* @return int The block size
*/
protected function getPartSize()
{
return Util::safeStrlen(hash($this->hash, '', true));
}