Shop/src/util/RandomGUID.java

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package util;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.*;
import java.util.Random;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class RandomGUID
{

    private static Log log;
    public String valueBeforeMD5;
    public String valueAfterMD5;
    private static Random myRand;
    private static SecureRandom mySecureRand;
    private static String s_id;

    public RandomGUID()
    {
        valueBeforeMD5 = "";
        valueAfterMD5 = "";
        getRandomGUID(false);
    }

    public RandomGUID(boolean secure)
    {
        valueBeforeMD5 = "";
        valueAfterMD5 = "";
        getRandomGUID(secure);
    }

    private void getRandomGUID(boolean secure)
    {
        MessageDigest md5 = null;
        StringBuffer sbValueBeforeMD5 = new StringBuffer();
        try
        {
            md5 = MessageDigest.getInstance("MD5");
        }
        catch(NoSuchAlgorithmException nosuchalgorithmexception) { }
        try
        {
            long time = System.currentTimeMillis();
            long rand = 0L;
            if(secure)
            {
                rand = mySecureRand.nextLong();
            } else
            {
                rand = myRand.nextLong();
            }
            sbValueBeforeMD5.append(s_id);
            sbValueBeforeMD5.append(":");
            sbValueBeforeMD5.append(Long.toString(time));
            sbValueBeforeMD5.append(":");
            sbValueBeforeMD5.append(Long.toString(rand));
            valueBeforeMD5 = sbValueBeforeMD5.toString();
            md5.update(valueBeforeMD5.getBytes());