public static function decrypt($keyString, $data)
{
$pos = strrpos($data, TPSecurityUtils::DELIM);
if ($pos > 0) {
$data = substr($data, 0, $pos);
}
$data = TPSecurityUtils::urldesafe($data);
if (strlen($keyString) > 32) {
$keyString = substr($keyString, 0, 32);
}
if (strlen($keyString) < 32) {
$keyString = str_pad($keyString, 32, 'X');
}
$iv = TPSecurityUtils::genRandomString(16);
$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
if (mcrypt_generic_init($cipher, $keyString, $iv) != -1) {
$cipherText = mdecrypt_generic($cipher, $data);
mcrypt_generic_deinit($cipher);
mcrypt_module_close($cipher);
$endCharVal = ord(substr($cipherText, strlen($cipherText) - 1, 1));
if ($endCharVal <= 16 && $endCharVal >= 0) {
$cipherText = substr($cipherText, 0, 0 - $endCharVal);
//Remove the padding (ascii value == ammount of padding)
}
return $cipherText;
}
}
