package com.lcg.gensinature;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.Context;

import android.content.DialogInterface;

import android.content.pm.PackageInfo;

import android.content.pm.PackageManager;

import android.content.pm.PackageManager.NameNotFoundException;

import android.content.pm.Signature;

import android.os.Bundle;

import android.text.ClipboardManager;

import android.text.Editable;

import android.text.TextUtils;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity

{

  private Button mCopyBtn;

  private Button mGenBtn;

  private EditText mPackageEt;

  private TextView md5SignTv;

  public static byte[] getSign(Context paramContext, String paramString)

  {

      PackageInfo localPackageInfo;

      int i;

      byte[] arrayOfByte;

      try

      {

        localPackageInfo = paramContext.getPackageManager().getPackageInfo(paramString, 64);

        i = 0;

        if (i >= localPackageInfo.signatures.length)

        {

          return null;

        }

        System.out.println(i);

        arrayOfByte = localPackageInfo.signatures[i].toByteArray();

        System.out.println(arrayOfByte);

        return arrayOfByte;

      }

      catch (PackageManager.NameNotFoundException localNameNotFoundException)

      {

        return null;

      }

  }

  protected void onCreate(Bundle paramBundle)

  {

    super.onCreate(paramBundle);

    setContentView(R.layout.activity_main);

    this.mPackageEt = ((EditText)findViewById(R.id.pkgNameEt));

    this.mGenBtn = ((Button)findViewById(R.id.getBtn));

    this.mGenBtn.setOnClickListener(new View.OnClickListener()

    {

      public void onClick(View paramView)

      {

        String str1 = MainActivity.this.mPackageEt.getText().toString();

        if (TextUtils.isEmpty(str1));

        byte[] arrayOfByte;

        	arrayOfByte = MainActivity.getSign(MainActivity.this.getApplicationContext(), str1);

        String str2 = "";

        try

        {

          str2 = MD5.hexdigest(arrayOfByte);

          Log.d("genSinature", "gen md5=" + str2);

          System.out.println(str2);

          MainActivity.this.md5SignTv.setText(str2);

          ClipboardManager cmb = (ClipboardManager)MainActivity.this.getSystemService(MainActivity.this.CLIPBOARD_SERVICE);

  		cmb.setText(str2);

  		Toast.makeText(MainActivity.this, "已经复制到剪贴板", 1).show();

          return;

        }

        catch (Exception e)

        {

        	e.printStackTrace();

        }

      }

    });

    this.md5SignTv = ((TextView)findViewById(R.id.resultTv));

    showDialog();

  }

  private void showDialog()

  {

    AlertDialog.Builder localBuilder = new AlertDialog.Builder(this);

    localBuilder.setCancelable(false);

    localBuilder.setTitle("警告ʾ").setMessage("将读取APP信息");

    localBuilder.setPositiveButton("拒绝", null);

    localBuilder.setNegativeButton("同意", new DialogInterface.OnClickListener()

    {

      public void onClick(DialogInterface paramDialogInterface, int paramInt)

      {

        MainActivity.this.finish();

      }

    });

    localBuilder.show();

  }

}

package com.lcg.gensinature;

import java.security.MessageDigest;

public class MD5

{

  private static final char[] hexDigits = { 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 97, 98, 99, 100, 101, 102 };

  public static String hexdigest(String paramString)

  {

    try

    {

      String str = hexdigest(paramString.getBytes());

      return str;

    }

    catch (Exception localException)

    {

    }

    return null;

  }

  public static String hexdigest(byte[] paramArrayOfByte)

  {

    try

    {

      MessageDigest localMessageDigest = MessageDigest.getInstance("MD5");

      System.out.println(paramArrayOfByte);

      localMessageDigest.update(paramArrayOfByte);

      byte[] arrayOfByte = localMessageDigest.digest();

      System.out.println(arrayOfByte);

      char[] arrayOfChar = new char[32];

      int i = 0;

      int j = 0;

      for(i=0;i<16;i++){

      int k = arrayOfByte[i];

      int l = j + 1;

      arrayOfChar[j] = hexDigits[(0xF & k >>> 4)];

      j = l + 1;

      arrayOfChar[l] = hexDigits[(k & 0xF)];

      }

      if (i >= 16)

          return new String(arrayOfChar);

    }

    catch (Exception e)

    {

    	e.printStackTrace();

    }

    return null;

  }

}