Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2010-12  Ciaran Gultnieks, ciaran@ciarang.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

import android.util.Log;
import java.io.BufferedInputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    public static String getBinaryHash(File apk, String algo) {
        FileInputStream fis = null;
        BufferedInputStream bis = null;
        try {
            MessageDigest md = MessageDigest.getInstance(algo);
            fis = new FileInputStream(apk);
            bis = new BufferedInputStream(fis);

            byte[] dataBytes = new byte[524288];
            int nread = 0;

            while ((nread = bis.read(dataBytes)) != -1)
                md.update(dataBytes, 0, nread);

            byte[] mdbytes = md.digest();
            return toHexString(mdbytes);
        } catch (IOException e) {
            Log.e("FDroid", "Error reading \"" + apk.getAbsolutePath() + "\" to compute " + algo + " hash.");
            return null;
        } catch (NoSuchAlgorithmException e) {
            Log.e("FDroid", "Device does not support " + algo + " MessageDisgest algorithm");
            return null;
        } finally {
            closeQuietly(fis);
        }
    }

    /**
     * Computes the base 16 representation of the byte array argument.
     *
     * @param bytes an array of bytes.
     * @return the bytes represented as a string of hexadecimal digits.
     */
    public static String toHexString(byte[] bytes) {
        BigInteger bi = new BigInteger(1, bytes);
        return String.format("%0" + (bytes.length << 1) + "X", bi);
    }

    public static void closeQuietly(Closeable closeable) {
        if (closeable == null) {
            return;
        }
        try {
            closeable.close();
        } catch (IOException ioe) {
            // ignore
        }
    }
}