MD5.java

/**
 * Copyright (C) 2010-2012 Regis Montoya (aka r3gis - www.r3gis.fr)
 * This file is part of CSipSimple.
 *
 *  CSipSimple 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.
 *  If you own a pjsip commercial license you can also redistribute it
 *  and/or modify it under the terms of the GNU Lesser General Public License
 *  as an android library.
 *
 *  CSipSimple 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 CSipSimple.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.ccxt.whl.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5 {

	public static boolean checkMD5(String md5, File updateFile)
			throws IOException {
		if (md5 == null || md5 == "" || updateFile == null) {
			return false;
		}

		String calculatedDigest = calculateMD5(updateFile);

		if (calculatedDigest == null) {
			return false;
		}
		return calculatedDigest.equalsIgnoreCase(md5);
	}

	public static String calculateMD5(File updateFile) {
		MessageDigest digest = null;
		try {
			digest = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e) {
			return null;
		}
		InputStream is = null;
		try {
			is = new FileInputStream(updateFile);
		} catch (FileNotFoundException e) {
			return null;
		}
		byte[] buffer = new byte[8192];
		int read = 0;
		try {
			while ((read = is.read(buffer)) > 0) {
				digest.update(buffer, 0, read);
			}
			byte[] md5sum = digest.digest();
			BigInteger bigInt = new BigInteger(1, md5sum);
			String output = bigInt.toString(16);
			// Fill to 32 chars
			output = String.format("%32s", output).replace(' ', '0');
			return output;
		} catch (IOException e) {
			throw new RuntimeException("Unable to process file for MD5", e);
		} finally {
			try {
				is.close();
			} catch (IOException e) {
				throw new RuntimeException(
						"Unable to close input stream for MD5 calculation", e);
			}
		}
	}
	
	
	public static String MD5Hash(String s) {
        MessageDigest m = null;

        try {
                m = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
                return "";
        }

        m.update(s.getBytes(),0,s.length());
        String hash = new BigInteger(1, m.digest()).toString(16);
        return hash;
	}
}