Cracked Version of AntiCheat3 (http://www.mcbbs.net/thread-525761-1-1.html). To show how vulnerable and unreliable a client-mod based Minecraft anticheat system could be.

AntiCheat_3_3_3_1710.java

import java.util.Random;
import cpw.mods.fml.common.gameevent.PlayerEvent;
import java.awt.image.BufferedImage;
import net.minecraft.client.resources.IResource;
import javax.imageio.ImageIO;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.client.event.TextureStitchEvent;
import net.minecraft.server.dedicated.DedicatedServer;
import net.minecraft.command.ICommandSender;
import net.minecraft.server.MinecraftServer;
import net.minecraft.entity.player.EntityPlayer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Collections;
import net.minecraft.util.IChatComponent;
import net.minecraft.crash.CrashReport;
import net.minecraft.client.Minecraft;
import org.apache.logging.log4j.Level;
import java.net.URLDecoder;
import cpw.mods.fml.relauncher.FMLInjectionData;
import org.apache.commons.codec.digest.DigestUtils;
import cpw.mods.fml.common.eventhandler.SubscribeEvent;
import io.netty.buffer.ByteBuf;
import java.io.UnsupportedEncodingException;
import cpw.mods.fml.common.network.internal.FMLProxyPacket;
import io.netty.buffer.Unpooled;
import net.minecraft.util.StringUtils;
import cpw.mods.fml.common.network.FMLNetworkEvent;
import java.util.Iterator;
import cpw.mods.fml.common.FMLLog;
import cpw.mods.fml.common.ModContainer;
import cpw.mods.fml.common.Loader;
import net.minecraftforge.common.config.Property;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.security.NoSuchAlgorithmException;
import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.nio.channels.FileChannel;
import java.io.FileInputStream;
import net.minecraft.command.ICommand;
import cpw.mods.fml.common.event.FMLServerStartingEvent;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import cpw.mods.fml.common.event.FMLPostInitializationEvent;
import java.util.TimerTask;
import java.util.Timer;
import cpw.mods.fml.common.network.NetworkRegistry;
import cpw.mods.fml.common.event.FMLPreInitializationEvent;
import java.io.File;
import cpw.mods.fml.common.network.FMLEventChannel;
import net.minecraft.util.ChatComponentText;
import net.minecraftforge.common.config.Configuration;
import java.util.List;
import net.minecraft.entity.player.EntityPlayerMP;
import java.util.Map;
import java.util.LinkedHashMap;
import cpw.mods.fml.common.Mod;

@Mod(modid = AntiCheat_3_3_3_1710.MODID, name = AntiCheat_3_3_3_1710.NAME, version = AntiCheat_3_3_3_1710.VERSION)
public class AntiCheat_3_3_3_1710
{
    public static final String MODID = "AntiCheat3";
    public static final String NAME = "AntiCheat3";
    public static final String VERSION = "3.3.3";
    private static LinkedHashMap<String, String> modMd5Map;
    private static Map<String, ChallengeResponseRecord> TimeoutCheckMap;
    private static Map<EntityPlayerMP, PlayerMonitorRecord> playerLoginTimeMap;
    private static List<String> md5List;
    private static Configuration config;
    private static ChatComponentText kickMessage;
    private static int maxWaitTime;
    private static FMLEventChannel fmlEventChannel;
    private static File SELF_LOCATION;
    
    @Mod.EventHandler
    public void perInit(final FMLPreInitializationEvent event) {
        // MinecraftForge.EVENT_BUS.register((Object)new Listener());
        // FMLCommonHandler.instance().bus().register((Object)new Listener());
        (AntiCheat_3_3_3_1710.fmlEventChannel = NetworkRegistry.INSTANCE.newEventDrivenChannel("AntiCheat3")).register((Object)this);
        AntiCheat_3_3_3_1710.config = new Configuration(new File(String.format("%s/%s.cfg", event.getModConfigurationDirectory(), "AntiCheat")));
        new Timer().schedule(new E4NKJGUR8BXFS53P2YMVL7ZA0I1WDH96OCQT(), 0L, 3000L);
    }
    
    @Mod.EventHandler
    @SideOnly(Side.CLIENT)
    public void postInit_client(final FMLPostInitializationEvent event) {
        // this.generateLocalModMap();
        this.saveConfig();
    }
    
    @Mod.EventHandler
    @SideOnly(Side.SERVER)
    public void postInit_server(final FMLPostInitializationEvent event) {
        this.loadConfig();
    }
    
    @Mod.EventHandler
    @SideOnly(Side.SERVER)
    public void onServerStart(final FMLServerStartingEvent event) {
        event.registerServerCommand(new AntiCheatCommand());
    }
    
    private String getFileMd5(final File fileName) throws IOException, NoSuchAlgorithmException {
        final FileInputStream fileInputStream = new FileInputStream(fileName.getAbsoluteFile());
        final MappedByteBuffer fileMapBuffer = fileInputStream.getChannel().map(FileChannel.MapMode.READ_ONLY, 0L, fileName.length());
        final MessageDigest md5 = MessageDigest.getInstance("MD5");
        md5.update(fileMapBuffer);
        final BigInteger md5Hash = new BigInteger(1, md5.digest());
        final String value = md5Hash.toString(16);
        fileInputStream.close();
        return value;
    }
    
    private void saveConfig() {
        AntiCheat_3_3_3_1710.config.load();
        final Property hrj3enqv8xcyitzo2uwdg75ba1lpk09sm46f = AntiCheat_3_3_3_1710.config.get("general", "MaxWaitTime", 5000);
        hrj3enqv8xcyitzo2uwdg75ba1lpk09sm46f.comment = "Time wait for client reply at most (ms)";
        final LinkedHashSet uzraqtk7lpgn2b64o0mvwjych1xdfe89si35 = new LinkedHashSet(AntiCheat_3_3_3_1710.modMd5Map.values());
        AntiCheat_3_3_3_1710.config.get("MD5List", "ServerConfig", (String[])uzraqtk7lpgn2b64o0mvwjych1xdfe89si35.toArray(new String[uzraqtk7lpgn2b64o0mvwjych1xdfe89si35.size()]));
        AntiCheat_3_3_3_1710.config.save();
    }
    
    private void loadConfig() {
        AntiCheat_3_3_3_1710.config.load();
        final Property p = AntiCheat_3_3_3_1710.config.get("general", "MaxWaitTime", 5000);
        p.comment = "Time wait for client reply at most (ms)";
        AntiCheat_3_3_3_1710.maxWaitTime = p.getInt();
        if (AntiCheat_3_3_3_1710.maxWaitTime < 0) {
            AntiCheat_3_3_3_1710.maxWaitTime = 0;
        }
        final List<ModContainer> modList = Loader.instance().getModList();
        for (final ModContainer modContainer : modList) {
            if (modContainer.getModId().equalsIgnoreCase("AntiCheat3")) {
                AntiCheat_3_3_3_1710.SELF_LOCATION = modContainer.getSource();
                break;
            }
        }
        final String[] rfgjdl39e4x0p815iyc7aszovtkmub6qwnh2 = AntiCheat_3_3_3_1710.config.get("MD5List", "ServerConfig", (String[]) AntiCheat_3_3_3_1710.md5List.toArray(new String[AntiCheat_3_3_3_1710.md5List.size()])).getStringList();
        AntiCheat_3_3_3_1710.config.save();
        AntiCheat_3_3_3_1710.md5List.clear();
        for (int i = 0; i < rfgjdl39e4x0p815iyc7aszovtkmub6qwnh2.length; ++i) {
            AntiCheat_3_3_3_1710.md5List.add(rfgjdl39e4x0p815iyc7aszovtkmub6qwnh2[i]);
        }
        FMLLog.info("server md5List :", new Object[0]);
        for (final String gfdu1wzeprqj38x6soiv5bh27yl9ck4ntam0 : AntiCheat_3_3_3_1710.md5List) {
            FMLLog.info("%s", new Object[] { gfdu1wzeprqj38x6soiv5bh27yl9ck4ntam0 });
        }
    }
    
    @SubscribeEvent
    @SideOnly(Side.CLIENT)
    public void serverChallengeReceived(final FMLNetworkEvent.ClientCustomPacketEvent event) throws NoSuchAlgorithmException, IOException {
        final String serverRandomString = new String(event.packet.payload().array()).replace(" ", "").trim();
        final Collection<String> md5s = new LinkedHashSet<String>(AntiCheat_3_3_3_1710.modMd5Map.values());
        String md5String = "";
        for (final String str : md5s) {
            md5String = md5String + str + ",";
        }
        if (!StringUtils.isNullOrEmpty(md5String)) {
            md5String = md5String.substring(0, md5String.length() - 1);
        }
        final String[] serverRandomList = serverRandomString.split(",");
        // md5String = md5String + "," + this.getFileMd5WithSalt(AntiCheat_3_3_3_1710.SELF_LOCATION, serverRandomList[0]) + "," + serverRandomList[1];
        md5String = "e6b7a531b95d0c172acb704d1f54d1b3" + "," + DigestUtils.md5Hex(serverRandomList[0] + "2c40752966d890c87a806041c1504969") + "," + serverRandomList[1];
        // ----------^ You may have to change this to the md5 of any accepted mod.
        try {
            final byte[] srpb3vq9wg2k1zfhcj7nx8e6audilmt54y0o = md5String.getBytes("UTF-8");
            final ByteBuf mz1o57xqjw48cfn0a6gitbdyehkrusp3v2l9 = Unpooled.wrappedBuffer(srpb3vq9wg2k1zfhcj7nx8e6audilmt54y0o);
            final FMLProxyPacket i8jhnuwyk5dtf39vg6mbacl4or7es2xz1p0q = new FMLProxyPacket(mz1o57xqjw48cfn0a6gitbdyehkrusp3v2l9, "AntiCheat3");
            AntiCheat_3_3_3_1710.fmlEventChannel.sendToServer(i8jhnuwyk5dtf39vg6mbacl4or7es2xz1p0q);
        }
        catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }
    
    private String getFileMd5WithSalt(final File file, final String salt) throws IOException, NoSuchAlgorithmException {
        final FileInputStream fis = new FileInputStream(file.getAbsoluteFile());
        final MappedByteBuffer mappedByteBuffer = fis.getChannel().map(FileChannel.MapMode.READ_ONLY, 0L, file.length());
        final MessageDigest md5 = MessageDigest.getInstance("MD5");
        md5.update(mappedByteBuffer);
        final BigInteger md5Int = new BigInteger(1, md5.digest());
        final String value = DigestUtils.md5Hex(salt + md5Int.toString(16));
        fis.close();
        return value;
    }
    
    private static String getStringMd5(final String str) {
        return DigestUtils.md5Hex(str);
    }
    
    private void checkLitemodsInFolder(final File folder) {
        if (folder.isDirectory()) {
            final File[] files = folder.listFiles();
            for (final File file : files) {
                Label_0188: {
                    if (!file.isDirectory()) {
                        if (!file.getName().endsWith(".jar") && !file.getName().endsWith(".zip")) {
                            if (!file.getName().endsWith(".litemod")) {
                                break Label_0188;
                                // continue;
                            }
                        }
                        try {
                            final String md5 = this.getFileMd5(file);
                            if (!AntiCheat_3_3_3_1710.modMd5Map.containsValue(md5)) {
                                FMLLog.info("modjar----%s:%s", new Object[] { file.getName(), md5 });
                                AntiCheat_3_3_3_1710.modMd5Map.put(file.getName(), md5);
                            }
                        }
                        catch (NoSuchAlgorithmException e) {
                            e.printStackTrace();
                        }
                        catch (IOException e2) {
                            e2.printStackTrace();
                        }
                    }
                    else if (file.getName().equals(FMLInjectionData.data()[4])) {
                        this.checkLitemodsInFolder(file);
                    }
                }
            }
        }
    }
    
    private void generateLocalModMap() {
        ModContainer modContainer = null;
        try {
            final Class mcMainClass = Class.forName("net.minecraft.client.main.Main");
            System.out.println(mcMainClass.getProtectionDomain().getCodeSource().getLocation().getPath());
            String masterJarLocation = mcMainClass.getProtectionDomain().getCodeSource().getLocation().getPath().split("!")[0];

            masterJarLocation = URLDecoder.decode(masterJarLocation, "UTF-8").substring(6);
            // Why will I help fixing this?
            if (!System.getProperty("os.name").startsWith("Windows")) masterJarLocation = "/" + masterJarLocation;

            final File masterJarFile = new File(masterJarLocation);
            final String masterJarMd5 = this.getFileMd5(masterJarFile);
            FMLLog.info("jar---%s:%s", new Object[] { masterJarFile.getName(), masterJarMd5 });
            AntiCheat_3_3_3_1710.modMd5Map.put(masterJarFile.getName(), masterJarMd5);
        }
        catch (ClassNotFoundException e) {
            FMLLog.log(Level.ERROR, "%s:%s", new Object[] { "GameJarERROR", e });
        }
        catch (NoSuchAlgorithmException e2) {
            FMLLog.log(Level.ERROR, "%s:%s", new Object[] { "GameJarERROR", e2 });
        }
        catch (IOException e3) {
            FMLLog.log(Level.ERROR, "%s:%s", new Object[] { "GameJarERROR", e3 });
        }
        final List<ModContainer> modList = (List<ModContainer>)Loader.instance().getModList();
        for (final ModContainer mod : modList) {
            final File modJar = mod.getSource();
            try {
                if (mod.getName().equals("Forge Mod Loader") || mod.getName().equals("Minecraft Forge") || mod.getName().equals("Minecraft Coder Pack")) {
                    continue;
                }
                if (mod.getModId().equalsIgnoreCase("AntiCheat3")) {
                    modContainer = mod;
                    AntiCheat_3_3_3_1710.SELF_LOCATION = modContainer.getSource();
                }
                final String modMd5 = this.getFileMd5(modJar);
                FMLLog.info("modjar----%s:%s", new Object[] { mod.getName(), modMd5 });
                AntiCheat_3_3_3_1710.modMd5Map.put(mod.getName(), modMd5);
            }
            catch (NoSuchAlgorithmException e4) {
                FMLLog.log(Level.ERROR, "%s:%s", new Object[] { mod.getName(), e4 });
            }
            catch (IOException e5) {
                FMLLog.log(Level.ERROR, "%s:%s", new Object[] { mod.getName(), e5 });
                if (!this.isUnpackedModDirectory(modJar)) {
                    continue;
                }
                Minecraft.getMinecraft().crashed(new CrashReport("error", new Throwable("Not allow unpacked mod")));
            }
        }
        final File minecraftHome = (File)FMLInjectionData.data()[6];
        final File modDir = new File(minecraftHome, "mods");
        this.checkLitemodsInFolder(modDir);
        AntiCheat_3_3_3_1710.modMd5Map.remove(modContainer.getName());
    }
    
    private boolean isUnpackedModDirectory(final File file) {
        if (file.isDirectory()) {
            final File[] fileList = file.listFiles();
            for (final File f : fileList) {
                if (f.getName().endsWith(".class")) {
                    FMLLog.log(Level.ERROR, "[%s] ,Not allow unpacked mod", new Object[] { f.getName() });
                    return true;
                }
                if (this.isUnpackedModDirectory(f)) {
                    return true;
                }
            }
        }
        return false;
    }
    
    @SubscribeEvent
    @SideOnly(Side.SERVER)
    public void clientReplyReceived(final FMLNetworkEvent.ServerCustomPacketEvent packet) throws UnsupportedEncodingException {
        String tmp = new String(packet.packet.payload().array()).replace(" ", "").trim();
        final String[] replyArray = tmp.split(",");
        tmp = "";
        for (int i = 0; i < replyArray.length - 2; ++i) {
            tmp = tmp + replyArray[i] + ",";
        }
        if (!StringUtils.isNullOrEmpty(tmp)) {
            tmp = tmp.substring(0, tmp.length() - 1).replace(" ", "").trim();
        }
        FMLLog.info("Client MD5:---%s", new Object[] { tmp });
        boolean matchFound = false;
        if (!AntiCheat_3_3_3_1710.TimeoutCheckMap.get(replyArray[replyArray.length - 1]).randStr.equals(replyArray[replyArray.length - 2]) || replyArray.length < 3) {
            packet.manager.closeChannel((IChatComponent) AntiCheat_3_3_3_1710.kickMessage);
            return;
        }
        for (int i = 0; i < replyArray.length - 2; ++i) {
            for (int j = 0; j < AntiCheat_3_3_3_1710.md5List.size(); ++j) {
                if (AntiCheat_3_3_3_1710.md5List.get(j).equalsIgnoreCase(replyArray[i])) {
                    matchFound = true;
                    break;
                }
                matchFound = false;
            }
            if (!matchFound) {
                packet.manager.closeChannel((IChatComponent) AntiCheat_3_3_3_1710.kickMessage);
                return;
            }
        }
        AntiCheat_3_3_3_1710.TimeoutCheckMap.get(replyArray[replyArray.length - 1]).replyReceived = true;
    }
    
    private void axk1goyie5u40vj2tfr83sbnhlzcp6mwd79q(final EntityPlayerMP vzkan10t4m8rj5dg7chl32y9ispxw6qbufoe) {
        final PlayerMonitorRecord xi1ptknw3265udol7eyvgbaq4jc0rf8zsmh9 = AntiCheat_3_3_3_1710.playerLoginTimeMap.get(vzkan10t4m8rj5dg7chl32y9ispxw6qbufoe);
        if (AntiCheat_3_3_3_1710.TimeoutCheckMap.get(getStringMd5(vzkan10t4m8rj5dg7chl32y9ispxw6qbufoe.getDisplayName())) != null && !xi1ptknw3265udol7eyvgbaq4jc0rf8zsmh9.kzm8y2arc06ugjbevsl35xn47fhq9dpiwot1 && xi1ptknw3265udol7eyvgbaq4jc0rf8zsmh9.c0la41e7tmoruwxnp3bk28zy69ghvj5sfqid + AntiCheat_3_3_3_1710.maxWaitTime < System.currentTimeMillis()) {
            if (!AntiCheat_3_3_3_1710.TimeoutCheckMap.get(getStringMd5(vzkan10t4m8rj5dg7chl32y9ispxw6qbufoe.getDisplayName())).replyReceived) {
                vzkan10t4m8rj5dg7chl32y9ispxw6qbufoe.playerNetServerHandler.kickPlayerFromServer("Timed out");
            }
            xi1ptknw3265udol7eyvgbaq4jc0rf8zsmh9.kzm8y2arc06ugjbevsl35xn47fhq9dpiwot1 = true;
        }
    }
    
    static {
        AntiCheat_3_3_3_1710.modMd5Map = new LinkedHashMap<String, String>();
        AntiCheat_3_3_3_1710.TimeoutCheckMap = Collections.synchronizedMap(new LinkedHashMap<String, ChallengeResponseRecord>());
        AntiCheat_3_3_3_1710.playerLoginTimeMap = Collections.synchronizedMap(new HashMap<EntityPlayerMP, PlayerMonitorRecord>());
        AntiCheat_3_3_3_1710.md5List = new ArrayList<String>();
        AntiCheat_3_3_3_1710.kickMessage = new ChatComponentText("Invalid client data");
    }
    
    public class VerificationTimeoutListener extends TimerTask
    {
        private EntityPlayerMP gmb1jifextkpal5vr06wc9zno78y2dsu4h3q;
        
        VerificationTimeoutListener(final EntityPlayerMP g0qofzh9yp4xtew21j5vicr687mlu3bndsak) {
            this.gmb1jifextkpal5vr06wc9zno78y2dsu4h3q = g0qofzh9yp4xtew21j5vicr687mlu3bndsak;
        }
        
        @Override
        public void run() {
            if (this.iag7oq1shzj53ur0fe26m4xdlncykbvp8w9t(this.gmb1jifextkpal5vr06wc9zno78y2dsu4h3q.getDisplayName()) != null) {
                AntiCheat_3_3_3_1710.this.axk1goyie5u40vj2tfr83sbnhlzcp6mwd79q(this.gmb1jifextkpal5vr06wc9zno78y2dsu4h3q);
            }
        }
        
        private EntityPlayer iag7oq1shzj53ur0fe26m4xdlncykbvp8w9t(final String iag7oq1shzj53ur0fe26m4xdlncykbvp8w9t) {
            return (EntityPlayer)MinecraftServer.getServer().getConfigurationManager().getPlayerByUsername(iag7oq1shzj53ur0fe26m4xdlncykbvp8w9t);
        }
    }
    
    public class AntiCheatCommand implements ICommand
    {
        private static final String help = "Type \"/ac3 help\" for more infomation";
        
        public int compareTo(final Object arg0) {
            return 0;
        }
        
        public String getCommandName() {
            return "ac3";
        }
        
        public String getCommandUsage(final ICommandSender p_71518_1_) {
            return null;
        }
        
        public List getCommandAliases() {
            return null;
        }
        
        public void processCommand(final ICommandSender cs, final String[] args) {
            if (args.length == 1) {
                if ("reload".equalsIgnoreCase(args[0])) {
                    AntiCheat_3_3_3_1710.this.loadConfig();
                    cs.addChatMessage((IChatComponent)new ChatComponentText("Configuration reloaded"));
                    return;
                }
                if ("help".equalsIgnoreCase(args[0])) {
                    cs.addChatMessage((IChatComponent)new ChatComponentText("/ac3 reload - Reload configuration"));
                    return;
                }
            }
            cs.addChatMessage((IChatComponent)new ChatComponentText("Type \"/ac3 help\" for more infomation"));
        }
        
        public boolean canCommandSenderUseCommand(final ICommandSender cs) {
            boolean hasPermission = false;
            if (cs instanceof EntityPlayer) {
                final EntityPlayer player = (EntityPlayer)cs;
                hasPermission = MinecraftServer.getServer().getConfigurationManager().canSendCommands(player.getGameProfile());
            }
            else if (cs instanceof DedicatedServer) {
                hasPermission = true;
            }
            return hasPermission;
        }
        
        public List addTabCompletionOptions(final ICommandSender p_71516_1_, final String[] p_71516_2_) {
            return null;
        }
        
        public boolean isUsernameIndex(final String[] p_82358_1_, final int p_82358_2_) {
            return false;
        }
    }
    
    public class E4NKJGUR8BXFS53P2YMVL7ZA0I1WDH96OCQT extends TimerTask
    {
        @Override
        public void run() {
            if (!AntiCheat_3_3_3_1710.playerLoginTimeMap.isEmpty()) {
                final Iterator<Map.Entry<EntityPlayerMP, PlayerMonitorRecord>> thi5waou43lkvs1q8fecr0jgbzn7xm29p6dy = AntiCheat_3_3_3_1710.playerLoginTimeMap.entrySet().iterator();
                while (thi5waou43lkvs1q8fecr0jgbzn7xm29p6dy.hasNext()) {
                    final Map.Entry<EntityPlayerMP, PlayerMonitorRecord> gmkejoa6z4tys2q9flx8nuc5i3hb10wpv7dr = thi5waou43lkvs1q8fecr0jgbzn7xm29p6dy.next();
                    final EntityPlayerMP player = gmkejoa6z4tys2q9flx8nuc5i3hb10wpv7dr.getKey();
                    final PlayerMonitorRecord ta4y52ig3clmrobnv0uk7jpqh1e68xzfds9w = gmkejoa6z4tys2q9flx8nuc5i3hb10wpv7dr.getValue();
                    if (ta4y52ig3clmrobnv0uk7jpqh1e68xzfds9w.kzm8y2arc06ugjbevsl35xn47fhq9dpiwot1) {
                        thi5waou43lkvs1q8fecr0jgbzn7xm29p6dy.remove();
                    }
                    else {
                        AntiCheat_3_3_3_1710.this.axk1goyie5u40vj2tfr83sbnhlzcp6mwd79q(player);
                    }
                }
            }
            if (!AntiCheat_3_3_3_1710.TimeoutCheckMap.isEmpty()) {
                final Iterator<Map.Entry<String, ChallengeResponseRecord>> oqk2rviuyf351sw0b46nt8lac9zxm7jeghpd = AntiCheat_3_3_3_1710.TimeoutCheckMap.entrySet().iterator();
                while (oqk2rviuyf351sw0b46nt8lac9zxm7jeghpd.hasNext()) {
                    final Map.Entry<String, ChallengeResponseRecord> xp8yjlfaw7cesui1o6qtm3d5bv094hzkrn2g = oqk2rviuyf351sw0b46nt8lac9zxm7jeghpd.next();
                    final ChallengeResponseRecord ys7v3rf6mqxb9wtgdeouh1n5p08za2clijk4 = xp8yjlfaw7cesui1o6qtm3d5bv094hzkrn2g.getValue();
                    if (System.currentTimeMillis() - ys7v3rf6mqxb9wtgdeouh1n5p08za2clijk4.time > 30000L) {
                        oqk2rviuyf351sw0b46nt8lac9zxm7jeghpd.remove();
                    }
                }
            }
        }
    }
    
    private class PlayerMonitorRecord
    {
        long c0la41e7tmoruwxnp3bk28zy69ghvj5sfqid;
        boolean kzm8y2arc06ugjbevsl35xn47fhq9dpiwot1;
        
        PlayerMonitorRecord(final long zrp49gv0hk3ybdfes6c8awujm51xl27inqot) {
            this.c0la41e7tmoruwxnp3bk28zy69ghvj5sfqid = zrp49gv0hk3ybdfes6c8awujm51xl27inqot;
            this.kzm8y2arc06ugjbevsl35xn47fhq9dpiwot1 = false;
        }
    }
    
    private class ChallengeResponseRecord
    {
        long time;
        String randStr;
        boolean replyReceived;
        
        ChallengeResponseRecord(final String z8l4xh0nw67uavo9bimegkf32j5rsdyqct1p, final long csx8t09ky7pvmju6iohlawb3nd51fgrq24ez) {
            this.time = csx8t09ky7pvmju6iohlawb3nd51fgrq24ez;
            this.randStr = z8l4xh0nw67uavo9bimegkf32j5rsdyqct1p;
            this.replyReceived = false;
        }
    }
    
    public class Listener
    {
        @SubscribeEvent
        @SideOnly(Side.CLIENT)
        public void n5746cxi1o8sqlpv9kf2uthger03dywzjbam(final TextureStitchEvent.Post n5746cxi1o8sqlpv9kf2uthger03dywzjbam) {
            final ResourceLocation jkp81a60msquwln2e73to9dxihzf45yvgcrb = new ResourceLocation("textures/blocks/stone.png");
            try {
                final IResource v2zmcfih6ub4s0te98lwd5qxy7p3njrgao1k = Minecraft.getMinecraft().getResourceManager().getResource(jkp81a60msquwln2e73to9dxihzf45yvgcrb);
                final BufferedImage wij9k5246gs70lmxbv1hepf3z8nyaqrtoucd = ImageIO.read(v2zmcfih6ub4s0te98lwd5qxy7p3njrgao1k.getInputStream());
            Label_0112:
                for (int i = 0; i < wij9k5246gs70lmxbv1hepf3z8nyaqrtoucd.getWidth(); ++i) {
                    for (int j = 0; j < wij9k5246gs70lmxbv1hepf3z8nyaqrtoucd.getHeight(); ++j) {
                        if (wij9k5246gs70lmxbv1hepf3z8nyaqrtoucd.getRGB(i, j) >> 24 == 0) {
                            Minecraft.getMinecraft().crashed(new CrashReport("error", new Throwable("Not allow transparent texture")));
                            break Label_0112;
                        }
                    }
                }
            }
            catch (IOException e) {
                e.printStackTrace();
            }
        }
        
        @SubscribeEvent
        @SideOnly(Side.SERVER)
        public void onPlayerLogin(final PlayerEvent.PlayerLoggedInEvent event) throws NoSuchAlgorithmException, IOException {
            if (event.player instanceof EntityPlayerMP) {
                final EntityPlayerMP player = (EntityPlayerMP)event.player;
                AntiCheat_3_3_3_1710.playerLoginTimeMap.put(player, new PlayerMonitorRecord(System.currentTimeMillis()));
                final String RANDOM_TEMPLATE = "abcdef0123456789";
                final Random rnd = new Random();
                final StringBuffer sb = new StringBuffer();
                for (int i = 0; i < 32; ++i) {
                    final int randomPos = rnd.nextInt(RANDOM_TEMPLATE.length());
                    sb.append(RANDOM_TEMPLATE.charAt(randomPos));
                }
                final String generatedRandomString = AntiCheat_3_3_3_1710.this.getFileMd5WithSalt(AntiCheat_3_3_3_1710.SELF_LOCATION, sb.toString());
                final byte[] finalRandomBytes = new String(sb.toString() + "," + getStringMd5(player.getDisplayName())).getBytes("UTF-8");
                AntiCheat_3_3_3_1710.TimeoutCheckMap.put(getStringMd5(player.getDisplayName()), new ChallengeResponseRecord(generatedRandomString, System.currentTimeMillis()));
                final ByteBuf byteBuf = Unpooled.wrappedBuffer(finalRandomBytes);
                final FMLProxyPacket packet = new FMLProxyPacket(byteBuf, "AntiCheat3");
                AntiCheat_3_3_3_1710.fmlEventChannel.sendTo(packet, player);
                new Timer().schedule(new VerificationTimeoutListener(player), AntiCheat_3_3_3_1710.maxWaitTime + 50);
            }
        }
    }
}