给你的mod菜单添加上签名校验吧

发觉已然没有值得我兴奋的教程，真正的大佬们把自己的技术藏的严严实实[滑稽]便从研究MOD改个方向研究安全。寻思着一法通则万法通，本意是想写一个so层的c++签名检验，往hook框架进发。所以最近研究了一些关于签名检验的东西，从java层面，以及对lgl菜单的一个兼容，写了一个java层次的签名检验代码
由于我们经常需要对游戏进行去签，一些检验方式可能不是很适合，可能把自己的也防了。所以就从md5值方向出发。
实现功能比较简单，检验md5值，正确就正确运行，错误就弹出对话框，对话框的构造函数是默认的安卓对话框方式，实现功能为可以跳转链接。。。如果你有一定开发基础，也可以根据这个方向进行一定美化以及，对检验强度进行一个加强，这是我在so层检验的一个小产物。。

主要部分都有注释，复制全文提取代码部分粘贴到你的菜单项目，文件路径为:
我的菜单/app/src/main/java/com/android/support/main.java

建议是在完成植入与编译后，通过dex2c将代码抽取，提高安全程度。。。

package com.android.support;
import android.app.AlertDialog;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import java.security.NoSuchAlgorithmException;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.content.DialogInterface;
import android.graphics.drawable.GradientDrawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.os.Process;
import android.provider.Settings;
import android.view.Gravity;
import android.view.SurfaceHolder;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.NetworkInterface;
import java.net.URL;
import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.UUID;
import org.json.JSONException;
import org.json.JSONObject;
import static android.graphics.Typeface.BOLD;
import android.app.Activity;
public class Main {
    private static native void CheckOverlayPermission(Context context);
    static {
//你所用so库的名字
        System.loadLibrary("mylibname");
    }
    public static interface callbackSwitch {
        void newMenu(Context context);
    }
    //获取<a href="https://www.knrjk.com/tag/99" target="_blank">应用</a>签名 MD5 值
    private static String getAppSignatureMD5(Context context) {
        try {
            PackageInfo packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES);
            Signature[] signatures = packageInfo.signatures;
            byte[] signatureBytes = signatures[0].toByteArray();
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(signatureBytes);
            byte[] digest = md.digest();
            StringBuilder sb = new StringBuilder();
            for (byte b : digest) {
                sb.append(String.format("%02<a href="https://www.knrjk.com/tag/1481" target="_blank">X</a>", b));
            }
            return sb.toString();
        } catch (PackageManager.NameNotFoundException | NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }
    public static void Start(Context context) {
        CrashHandler.init(context, false);
        // 检查签名 MD5 值
        String appSignatureMD5 = getAppSignatureMD5(context);
        String expectedMD5 = "123456"; // 请将此处替换为您期望的 MD5 值
        if (appSignatureMD5 != null && appSignatureMD5.equals(expectedMD5)) {
            CheckOverlayPermission(context);
        } else {
            // 签名错误，退出程序
            showErrorDialog(context);
        }
    }
    private static void showErrorDialog(final Context context) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setTitle("错误");//对话框标题
        builder.setMessage("签名错误，退出程序");
        builder.setPositiveButton("打开链接", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.example.com"));
                context.startActivity(browserIntent);
            }
        });
        builder.setCancelable(false);
        builder.show();
    }
}
package com.android.support;

import android.app.AlertDialog;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import java.security.NoSuchAlgorithmException;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.content.DialogInterface;
import android.graphics.drawable.GradientDrawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.os.Process;
import android.provider.Settings;
import android.view.Gravity;
import android.view.SurfaceHolder;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.NetworkInterface;
import java.net.URL;
import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.UUID;

import org.json.JSONException;
import org.json.JSONObject;

import static android.graphics.Typeface.BOLD;
import android.app.Activity;

public class Main {

    private static native void CheckOverlayPermission(Context context);
    static {
//你所用so库的名字
        System.loadLibrary("mylibname");
    }

    public static interface callbackSwitch {
        void newMenu(Context context);
    }

    //获取<a href="https://www.knrjk.com/tag/99" target="_blank">应用</a>签名 MD5 值
    private static String getAppSignatureMD5(Context context) {
        try {
            PackageInfo packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES);
            Signature[] signatures = packageInfo.signatures;
            byte[] signatureBytes = signatures[0].toByteArray();
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(signatureBytes);
            byte[] digest = md.digest();
            StringBuilder sb = new StringBuilder();
            for (byte b : digest) {
                sb.append(String.format("%02<a href="https://www.knrjk.com/tag/1481" target="_blank">X</a>", b));
            }
            return sb.toString();
        } catch (PackageManager.NameNotFoundException | NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void Start(Context context) {
        CrashHandler.init(context, false);
        // 检查签名 MD5 值
        String appSignatureMD5 = getAppSignatureMD5(context);
        String expectedMD5 = "123456"; // 请将此处替换为您期望的 MD5 值
        if (appSignatureMD5 != null && appSignatureMD5.equals(expectedMD5)) {
            CheckOverlayPermission(context);
        } else {
            // 签名错误，退出程序
            showErrorDialog(context);
        }
    }
    private static void showErrorDialog(final Context context) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setTitle("错误");//对话框标题
        builder.setMessage("签名错误，退出程序");
        builder.setPositiveButton("打开链接", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.example.com"));
                context.startActivity(browserIntent);
            }
        });
        builder.setCancelable(false);
        builder.show();
    }
}
package com.android.support;

import android.app.AlertDialog;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import java.security.NoSuchAlgorithmException;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.content.DialogInterface;
import android.graphics.drawable.GradientDrawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.os.Process;
import android.provider.Settings;
import android.view.Gravity;
import android.view.SurfaceHolder;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.NetworkInterface;
import java.net.URL;
import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.UUID;

import org.json.JSONException;
import org.json.JSONObject;

import static android.graphics.Typeface.BOLD;
import android.app.Activity;

public class Main {

    private static native void CheckOverlayPermission(Context context);
    static {
//你所用so库的名字
        System.loadLibrary("mylibname");
    }

    public static interface callbackSwitch {
        void newMenu(Context context);
    }

    //获取应用签名 MD5 值
    private static String getAppSignatureMD5(Context context) {
        try {
            PackageInfo packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES);
            Signature[] signatures = packageInfo.signatures;
            byte[] signatureBytes = signatures[0].toByteArray();
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(signatureBytes);
            byte[] digest = md.digest();
            StringBuilder sb = new StringBuilder();
            for (byte b : digest) {
                sb.append(String.format("%02X", b));
            }
            return sb.toString();
        } catch (PackageManager.NameNotFoundException | NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void Start(Context context) {
        CrashHandler.init(context, false);
        // 检查签名 MD5 值
        String appSignatureMD5 = getAppSignatureMD5(context);
        String expectedMD5 = "123456"; // 请将此处替换为您期望的 MD5 值
        if (appSignatureMD5 != null && appSignatureMD5.equals(expectedMD5)) {
            CheckOverlayPermission(context);
        } else {
            // 签名错误，退出程序
            showErrorDialog(context);
        }
    }
    private static void showErrorDialog(final Context context) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setTitle("错误");//对话框标题
        builder.setMessage("签名错误，退出程序");
        builder.setPositiveButton("打开链接", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.example.com"));
                context.startActivity(browserIntent);
            }
        });
        builder.setCancelable(false);
        builder.show();
    }
}