93 lines
2.4 KiB
Java
93 lines
2.4 KiB
Java
/*
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* Copyright (C) 2004-2015 L2J Server
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*
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* This file is part of L2J Server.
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*
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* L2J Server is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* L2J Server is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.l2jserver.gameserver.network;
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/**
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* @author KenM
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*/
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public class GameCrypt
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{
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private final byte[] _inKey = new byte[16];
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private final byte[] _outKey = new byte[16];
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private boolean _isEnabled;
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public void setKey(byte[] key)
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{
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System.arraycopy(key, 0, _inKey, 0, 16);
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System.arraycopy(key, 0, _outKey, 0, 16);
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}
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public void decrypt(byte[] raw, final int offset, final int size)
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{
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if (!_isEnabled)
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{
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return;
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}
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int temp = 0;
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for (int i = 0; i < size; i++)
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{
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int temp2 = raw[offset + i] & 0xFF;
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raw[offset + i] = (byte) (temp2 ^ _inKey[i & 15] ^ temp);
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temp = temp2;
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}
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int old = _inKey[8] & 0xff;
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old |= (_inKey[9] << 8) & 0xff00;
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old |= (_inKey[10] << 0x10) & 0xff0000;
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old |= (_inKey[11] << 0x18) & 0xff000000;
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old += size;
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_inKey[8] = (byte) (old & 0xff);
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_inKey[9] = (byte) ((old >> 0x08) & 0xff);
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_inKey[10] = (byte) ((old >> 0x10) & 0xff);
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_inKey[11] = (byte) ((old >> 0x18) & 0xff);
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}
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public void encrypt(byte[] raw, final int offset, final int size)
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{
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if (!_isEnabled)
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{
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_isEnabled = true;
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return;
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}
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int temp = 0;
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for (int i = 0; i < size; i++)
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{
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int temp2 = raw[offset + i] & 0xFF;
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temp = temp2 ^ _outKey[i & 15] ^ temp;
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raw[offset + i] = (byte) temp;
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}
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int old = _outKey[8] & 0xff;
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old |= (_outKey[9] << 8) & 0xff00;
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old |= (_outKey[10] << 0x10) & 0xff0000;
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old |= (_outKey[11] << 0x18) & 0xff000000;
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old += size;
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_outKey[8] = (byte) (old & 0xff);
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_outKey[9] = (byte) ((old >> 0x08) & 0xff);
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_outKey[10] = (byte) ((old >> 0x10) & 0xff);
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_outKey[11] = (byte) ((old >> 0x18) & 0xff);
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}
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}
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