/**
* To binary
*
* @return string
*/
public function toBinary()
{
$binBody = $this->body->toBinary();
$this->header->setLenght(Util::binaryLength($binBody));
$binHeader = $this->header->toBinary();
$pad = $this->header->getPseudoPad($this->secret);
if ($this->header->isEncrypted()) {
$binData = $binHeader . ($binBody ^ $pad);
} else {
$binData = $binHeader . $binBody;
}
return $binData;
}