public function receive($len = null)
{
if (!$len) {
$len = $this->receive(2);
}
if ($len instanceof ServerMessage\Response\DataLength) {
$len = $len->getLength();
}
if (socket_recv($this->socket, $data, $len, MSG_WAITALL) === false) {
$this->error();
}
if (!$this->checkLength($data, $len)) {
throw new SocketException('Read error ' . $len . ' bytes from server.', -1);
}
return ServerMessageFactory::create($data);
}
public function decrypt()
{
if (!$this->getMessage() instanceof ServerMessage\Crypt) {
throw new CipherException('Can\'t decrypt ' . get_class($this->getMessage()) . '. Only ServerMessage\\Crypt is allowed.', 3);
}
$this->cipher->setIv($this->getMessage()->getRange($this->getMessage()->getLength() - 8, 8));
$decrypted = new Byte();
$decrypted->set('');
$length = $this->getMessage()->getLength();
for ($i = 0; $i < $length - 8; $i += self::DES_BLOCK_SIZE) {
$range = $this->getMessage()->getRange($i, self::DES_BLOCK_SIZE);
$decrypted->append($this->cipher->decrypt($range));
$this->cipher->setIv($range);
}
if (!$this->checkChecksum($decrypted)) {
throw new CipherException('Checksum failed. Possible incorrect 3DES key', 4);
}
// Todo: Obsługa sid caid, aktualnie wycinane
$decrypted = $decrypted->getRange(10);
return ServerMessageFactory::create($decrypted);
}