Maple Story encription

[br1337]

Hi guys.
I'm developing a clientless bot in Java for v62/83. However i have some problem's the the encription.
The problem is everythime i encode with the iv it become a different packet which i'm not able to decript

Encode:

@Override	protected void encode(ChannelHandlerContext ctx, Object message, ByteBuf buffer) throws Exception {
		final byte[] input = (byte[]) message;
		System.out.println("To decode: " + HexTool.toString(input));
		final byte[] unencrypted = new byte[input.length];
		System.arraycopy(input, 0, unencrypted, 0, input.length);
		final byte[] ret = new byte[unencrypted.length + 4];
		final byte[] header = send_crypto.getPacketHeader(unencrypted.length);
		MapleCustomEncryption.encryptData(unencrypted);
		send_crypto.crypt(unencrypted);
		System.arraycopy(header, 0, ret, 0, 4);
		System.arraycopy(unencrypted, 0, ret, 4, unencrypted.length);
		buffer.writeBytes(ret);
		System.out.println("After encode:  " + HexTool.toString(ret));
		
	


	}

Decode:

@Override
	protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> message) throws Exception {
		DecoderState decoderState = ctx.channel().attr(DECODER_STATE_KEY).get();
		
		if (decoderState == null) {
			decoderState = new DecoderState();
			ctx.channel().attr(DECODER_STATE_KEY).set(decoderState);
		}
		if (in.readableBytes() >= 4 && decoderState.packetlength == -1) {
			int packetHeader = in.readInt();
			if (!PacketEncoder.recvCypher.checkPacket(packetHeader)) {
				System.out.println("Invalid packet");
				//return;
			}
			decoderState.packetlength = MapleAESOFB.getPacketLength(packetHeader);
		} else if (in.readableBytes() < 4 && decoderState.packetlength == -1) {
			
			return;
		}
		if (in.readableBytes() >= decoderState.packetlength) {
			byte decryptedPacket[] = new byte[decoderState.packetlength];
			in.readBytes(decryptedPacket);
			System.out.println("Starting decode:  " + HexTool.toString(decryptedPacket));
			
			decoderState.packetlength = -1;
			PacketEncoder.recvCypher.crypt(decryptedPacket);
			MapleCustomEncryption.decryptData(decryptedPacket);
			System.out.println("Decoded: " + HexTool.toString(decryptedPacket));
			message.add(decryptedPacket);
			
		}

and the Cipher definition:

private final static short MAPLE_VERSION = 62;


	public static final byte key[] = { 0x13, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00,
			(byte) 0xB4, 0x00, 0x00, 0x00, 0x1B, 0x00, 0x00, 0x00, 0x0F, 0x00, 0x00, 0x00, 0x33, 0x00, 0x00, 0x00, 0x52,
			0x00, 0x00, 0x00 };


	public static byte ivRecv[] = { 70, 114, 122, 82 };


	public static byte ivSend[] = { 82, 48, 120, 115 };


	public static MapleAESOFB send_crypto;
	public static MapleAESOFB recvCypher;


	static {
		ivRecv[3] = (byte) (Math.random() * 255);
		ivSend[3] = (byte) (Math.random() * 255);
		send_crypto = new MapleAESOFB(key, ivSend, (short) (0xFFFF - MAPLE_VERSION));
		recvCypher = new MapleAESOFB(key, ivRecv, MAPLE_VERSION);
		


	}

If i comment the line send_crypto.crypt(unencrypted); and the line PacketEncoder.recvCypher.crypt(decryptedPacket); (the iv cripto) it works


any idea why?

 

[br1337]

That's definitely new, I remember being able to login fine a couple of months ago.

I found the source of the problem. it wss because I was trying to connect using the ip address without the domain.
I managed to get in game with the clb.