com.vethrfolnir.game.network.mu.crypt.MuKeyFactory.java Source code

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Here is the source code for com.vethrfolnir.game.network.mu.crypt.MuKeyFactory.java

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/**
 * Copyright (C) 2013-2014 Project-Vethrfolnir
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.vethrfolnir.game.network.mu.crypt;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteOrder;

import com.vethrfolnir.logging.MuLogger;
import com.vethrfolnir.services.assets.AssetManager;
import com.vethrfolnir.services.assets.key.FileKey;

import corvus.corax.Corax;

/**
 * @author PsychoJr
 * 
 */
public class MuKeyFactory {

    private static final MuLogger log = MuLogger.getLogger(MuKeyFactory.class);

    private static long[] xor_tab_datfile = new long[] { 0x3F08A79B, 0xE25CC287, 0x93D27AB9, 0x20DEA7BF };

    private static long[] clientToServerPacketEncKeys;
    private static long[] serverToClientPacketEncKeys = new long[12];
    private static long[] clientToServerPacketDecKeys = new long[12];
    private static long[] serverToClientPacketDecKeys;

    public static void parse() {
        log.info("Parsing Mu Cypher Keys.");
        readFile("system/static/keys/Enc2.dat", serverToClientPacketEncKeys);
        readFile("system/static/keys/Dec1.dat", clientToServerPacketDecKeys);
    }

    private static void readFile(String path, long[] out_dat) {

        AssetManager assetManager = Corax.fetch(AssetManager.class);

        ByteBuf buff = Unpooled.buffer().order(ByteOrder.LITTLE_ENDIAN);

        try (InputStream is = assetManager.loadAsset(FileKey.class, path)) {
            buff.writeBytes(is, is.available());
        } catch (IOException e) {
            e.printStackTrace();
        }

        buff.readerIndex(6);
        int pointer = 0;
        for (int i = 0; i < 3; i++) {
            long[] buf = new long[4];

            for (int j = 0; j < 4; j++) {
                buf[j] = buff.readUnsignedInt();
            }

            out_dat[pointer++] = buf[0] ^ (xor_tab_datfile[0]);
            out_dat[pointer++] = buf[1] ^ (xor_tab_datfile[1] & 0xFFFFFFFFL);
            out_dat[pointer++] = buf[2] ^ (xor_tab_datfile[2] & 0xFFFFFFFFL);
            out_dat[pointer++] = buf[3] ^ (xor_tab_datfile[3]);
        }
    }

    /**
     * @return the serverToClientPacketEncKeys
     */
    public static long[] getServerToClientPacketEncKeys() {
        return serverToClientPacketEncKeys;
    }

    /**
     * @return the clientToServerPacketDecKeys
     */
    public static long[] getClientToServerPacketDecKeys() {
        return clientToServerPacketDecKeys;
    }

    /**
     * @return the clientToServerPacketEncKeys
     */
    public static long[] getClientToServerPacketEncKeys() {
        if (clientToServerPacketEncKeys == null) {
            readFile("static_data/keys/Enc1.dat", clientToServerPacketEncKeys = new long[12]);
        }
        return clientToServerPacketEncKeys;
    }

    /**
     * @return the serverToClientPacketDecKeys
     */
    public static long[] getServerToClientPacketDecKeys() {
        if (serverToClientPacketDecKeys == null) {
            readFile("static_data/keys/Dec2.dat", serverToClientPacketDecKeys = new long[12]);
        }
        return serverToClientPacketDecKeys;
    }

}