public static function decode($text, $crypt_key)
{
$out = '';
$length = strlen($text) / 2;
for ($i = 0; $i < $length; $i++) {
$letter = substr($text, $i * 2, 2);
$code = (int) hexdec($letter);
$code = (256 + ($code - crypto::shift($crypt_key, $i))) % 256;
$letter = chr($code);
$out .= $letter;
}
return $out;
}
