IsaacCipher

Networking & Multiplayer
#1

Server Side

public void writeHeader(ISAACCipher cipher, int value) {
			int next = cipher.getNextKey();
			writeByte(value + next);
		}

// Set up the ISAAC ciphers.
			long clientHalf = in.readLong();
			long serverHalf = in.readLong();
			int[] isaacSeed = { (int) (clientHalf >> 32), (int) clientHalf, (int) (serverHalf >> 32), (int) serverHalf };
			setDecryptor(new ISAACCipher(isaacSeed));
			for (int i = 0; i < isaacSeed.length; i++) {
				isaacSeed[i] += 50;
			}
			setEncryptor(new ISAACCipher(isaacSeed));

Client side

int opcode = inputStream.readByte() & 0xff;
				opcode = opcode - decryption.getNextKey()&0xff;

serverSeed = inputStream.readLong();
					int[] seed = new int[4];
					seed[0] = (int) (Math.random() * 99999999D);
					seed[1] = (int) (Math.random() * 99999999D);
					seed[2] = (int) (serverSeed >> 32);
					seed[3] = (int) serverSeed;
					encryption = new IsaacCipher(seed);
					for (int i = 0; i < 4; i++) {
						seed[i] += 50;
					}
					decryption = new IsaacCipher(seed);

There’s something wrong with decryption.getNextKey()

This is my first time implementing it so I could’ve made a beginners mistake