Maple2.PacketLib

Packet Library for MapleStory2

Credits to @EricSoftTM for packet encryption algos

General Usage:

• SIV: Send IV
• RIV: Recv IV
• BLOCK_IV: Determines cipher ordering

Sending Packets

var sendCipher = new MapleCipher.Encryptor(VERSION, SIV, BLOCK_IV);
...
// Handshake is NOT encrypted
PacketWriter writer = PacketWriter.Of(HANDSHAKE_OPCODE);
Packet handshake = sendCipher.WriteHeader(handshake);
SendPacket(handshake);
...
PacketWriter writer = PacketWriter.Of(OPCODE);
writer.Write(DATA);

Packet encryptedPacket = sendCipher.Encrypt(writer);
SendPacket(encryptedPacket);

Receiving Packets

var recvCipher = new MapleCipher.Decryptor(VERSION, RIV, BLOCK_IV);
MapleStream stream = new MapleStream();
...
while (IS_READING) {
    var data = bytes from network;
    stream.Write(data);
    
    while (mapleStream.TryRead(out byte[] packetBuffer)) {
        Packet decryptedPacket = recvCipher.Decrypt(packetBuffer);
        OnPacket(decryptedPacket);
    }
}