Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

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

public class Main {

    public static boolean checkSignature(Context ctx, String packageName, String srcSignature) {

        PackageManager pm = ctx.getPackageManager();
        try {
            PackageInfo pack = pm.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
            Signature[] signatures = pack.signatures;
            String destSignature = getApkSignatureMD5String(signatures[0]);
            return destSignature.equalsIgnoreCase(srcSignature);
        } catch (NameNotFoundException e) {
            e.printStackTrace();
        }
        return false;
    }

    public static String getApkSignatureMD5String(Signature signature) {
        MessageDigest md;
        try {
            md = MessageDigest.getInstance("MD5");

            md.update(signature.toByteArray());

            byte[] digest = md.digest();

            return toHexString(digest);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return "";
    }

    private static String toHexString(byte[] block) {

        StringBuffer buf = new StringBuffer();

        int len = block.length;

        for (int i = 0; i < len; i++) {

            byte2hex(block[i], buf);

            // if (i < len - 1) {
            //
            // buf.append(":");
            //
            // }

        }

        return buf.toString();

    }

    private static void byte2hex(byte b, StringBuffer buf) {

        char[] hexChars = { '0', '1', '2', '3', '4', '5', '6', '7', '8',

                '9', 'A', 'B', 'C', 'D', 'E', 'F' };

        int high = ((b & 0xf0) >> 4);

        int low = (b & 0x0f);

        buf.append(hexChars[high]);

        buf.append(hexChars[low]);

    }
}