org.jwall.apache.httpd.MD5 Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of apache-config Show documentation
A Java library for reading Apache httpd configuration files
The newest version!
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *
 *   Copyright (C) 2010-2014 Christian Bockermann 
 *    
 *   This file is part of the jwall.org apache-config library. The apache-config library is
 *   a parsing library to handle Apache HTTPD configuration files.
 *
 *   More information and documentation for the jwall-tools can be found at
 *   
 *                      http://www.jwall.org/apache-config
 *   
 *   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, see .
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
package org.jwall.apache.httpd;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;


/**
 * 
 * This is a small helper-class that wraps around the java md5 message-digest
 * and computes the md5 hex-string of a given input string. It is basically
 * just a wrapper and uses the MessageDigest class of the Java runtime library. 
 * 
 * @author Christian Bockermann <[email protected]>
 * 
 */
public class MD5 {
    
    /**
     * Create a hex string of the MD5 sum of the given data (byte[] array).
     * 
     * @param array The data to compute the hash from.
     * @return The hex string of the MD5 hash.
     */
    private static String hex(byte[] array) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < array.length; ++i) {
            sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).toLowerCase().substring(1,3));
        }
        return sb.toString();
    }
    
    
    /**
     * This method will simply return the computed MD5 sum of the given input
     * string. The sum is returned in hex notation.
     * 
     * This is just a convenience method. Calls this method are delegated to
     * md5( byte[] data).
     * 
     * 
     * @param message The message to create the digest from.
     * @return The hex string of the message digest.
     */
    public static String md5 (String message) { 
        return md5( message.getBytes() );
    }
    
    
    /**
     * This method will simply return the computed MD5 sum of the given input
     * data. The sum is returned in hex notation.
     * 
     * @param message The message to create the digest from.
     * @return The hex string of the message digest.
     */
    public static String md5 ( byte[] data ){
    	try {
    		MessageDigest md = MessageDigest.getInstance("MD5");
    		return hex ( md.digest(data) );
    	} catch (NoSuchAlgorithmException e){
    		e.printStackTrace();
    		return null;
    	}
    }
    
    
    public static String md5( Serializable object ){
        try {
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream( out );
            oos.writeObject( object );
            oos.flush();
            oos.close();
            return md5(out.toByteArray());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return md5( object.toString().getBytes() );
    }
}