Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.util.Base64;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    /**
     * A double check about app signature that was passed by MainActivity as facetID.
     * @param facetId a string value composed by app hash. I.e. android:apk-key-hash:Lir5oIjf552K/XN4bTul0VS3GfM
     * @param context Application Context
     * @return true if the signature executed on runtime matches if signature sent by MainActivity
     */
    private static boolean checkAppSignature(String facetId, Context context) {
        try {
            PackageInfo packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(),
                    PackageManager.GET_SIGNATURES);
            for (Signature sign : packageInfo.signatures) {
                byte[] sB = sign.toByteArray();
                MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
                messageDigest.update(sign.toByteArray());
                String currentSignature = Base64.encodeToString(messageDigest.digest(), Base64.DEFAULT);
                if (currentSignature.toLowerCase().contains(facetId.split(":")[2].toLowerCase())) {
                    return true;
                }
            }
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return false;
    }
}