public NetPacket Encode(NetPacket packet)
{
// 필요한 사이즈를 계산하자
int addSize = packet.Size - packet.GetHeaderSize() + 1;
if (addSize % 8 != 0)
{
addSize = 8 - (addSize % 8);
}
// 패킷에 데이터가 남아있지 않으면 새로 할당하자
packet = CheckAndResizePacket(packet, addSize);
int headerSize = packet.GetHeaderSize();
byte[] data = packet.RawData;
int size = packet.Size;
// 체크섬값 초기화
data[size - 1] = InitChecksumValue;
// 체크섬값을 마지막에 넣자
data[size - 1] = GetChecksum(data, headerSize, size - headerSize);
// tea
CryptTea.EncryptSimple(data, headerSize, size - headerSize, _keys);
return(packet);
}
public NetPacket Decode(NetPacket packet)
{
int headerSize = packet.GetHeaderSize();
int size = packet.Size;
byte[] data = packet.RawData;
// tea
CryptTea.DecryptSimple(data, headerSize, size - headerSize, _keys);
// checksum
byte checksum = GetChecksum(data, headerSize, size - headerSize);
if (InitChecksumValue != checksum)
{
throw new Exception("not match packet checksum");
}
return(packet);
}
public TeaPacketFilter(int seed = 36324016)
{
_keys = CryptTea.GenerateKey(seed);
}