public NetPacket Encode(NetPacket packet)
{
// 패킷에 데이터가 남아있지 않으면 새로 할당하자
packet = CheckAndResizePacket(packet, 1);
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);
// xor
CryptXor.Crypt(data, headerSize, size - headerSize, _xorKey);
return(packet);
}
public NetPacket Decode(NetPacket packet)
{
int headerSize = packet.GetHeaderSize();
int size = packet.Size;
byte[] data = packet.RawData;
// xor
CryptXor.Crypt(data, headerSize, size - headerSize, _xorKey);
// checksum
byte checksum = GetChecksum(data, headerSize, size - headerSize);
if (InitChecksumValue != checksum)
{
throw new Exception($"Not match packet checksum [{packet.Property}]");
}
packet.Size -= 1;
return(packet);
}
public XorPacketFilter(int seed = 36324016, int keyLength = 1024)
{
_xorKey = CryptXor.GenerateKey(seed, keyLength);
}
