@Override
	protected boolean doDecode(IoSession session, IoBuffer buffer, ProtocolDecoderOutput out) throws Exception {
		LoginStage stage = (LoginStage) session.getAttribute("loginStage", LoginStage.REQUEST);
		switch (stage) {
			case REQUEST:
				if (buffer.remaining() < 2) {
					buffer.rewind();
					return false;
				}
				int loginOpcode = buffer.get() & 0xff;
				if (loginOpcode != 14) {
					session.close(false);
					return false;
				}
				buffer.position(buffer.position() + 1);
				int responseCode = 0x0;
				long key = random.nextLong();
				session.setAttribute("serverKey", key);
				session.write(new Streams().put(INITIAL_RESPONSE).put((byte) responseCode).putLong(key).toPacket());
				session.setAttribute("loginStage", LoginStage.INFO_BLOCK);
				return true;

			case INFO_BLOCK:
				if (buffer.remaining() < 7) {
					buffer.rewind();
					return false;
				}
				int sessionStatus = buffer.get() & 0xff;
				if (sessionStatus != 16 && sessionStatus != 18) {
					session.close(false);
					return false;
				}
				int encryptedBlockSize = (buffer.get() & 0xff) - 40;
				int magicId = buffer.get() & 0xff;

				if (magicId != 255) {
					session.close(false);
					return false;
				}
				int clientRevision = buffer.getShort() & 0xffff;
				if (clientRevision != 317) {
					session.close(false);
					return false;
				}
				buffer.position(buffer.position() + 37);
				encryptedBlockSize--;
				int reportedSize = buffer.get() & 0xff;
				if (reportedSize != encryptedBlockSize) {
					buffer.rewind();
					return false;
				}
				int rsaOpcode = buffer.get();
				if (rsaOpcode != 10) {
					session.close(false);
					return false;
				}
				long clientKey = buffer.getLong();
				long serverKey = (Long) session.getAttribute("serverKey");
				if (serverKey != buffer.getLong()) {
					System.out.println("" + serverKey + " -- ");
					session.close(false);
					return false;
				}
				buffer.position(buffer.position() + 4);
				String username = ProtocolUtils.getRs2String(buffer);
				String password = ProtocolUtils.getRs2String(buffer);

				Player player = new Player(3200, 3200, 0, username, password);
				session.setAttribute("player", player);
				World.getInstance().register(player);

				int[] isaacSeed = new int[] {
					(int) (clientKey >> 0x20), (int) clientKey, (int) (serverKey >> 0x20), (int) serverKey
				};
				session.setAttribute("decrypter", new ISAACCipher(isaacSeed));
				for (int i = 0; i < isaacSeed.length; i++)
					isaacSeed[i] += 0x32;
				session.setAttribute("encrypter", new ISAACCipher(isaacSeed));
				session.removeAttribute("loginStage");
				session.removeAttribute("serverKey");
				session.write(new Streams().put((byte) 2).put((Byte) player.getAttribute("staffStatus")).put((byte) 0).toPacket());
				session.getFilterChain().remove("protocol");
				session.getFilterChain().addFirst("protocol", new ProtocolCodecFilter(Rs2CodecFactory.GAME));

				player.setSession(session, true);
				player.getSender().sendLogin();
				return true;
		}
		return false;
	}