读取Android APK文件签名的方法

在微信开放平台等申请API key 和secret时经常要用到apk文件签名,那么如何读取呢?

下面贴一下相关读取源码:

一共两个文件MainActivity和MD5,

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;
}
}

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