org/objectweb/proactive/ext/security/crypto/RandomLongGenerator.java

/* 
 * ################################################################
 * 
 * ProActive: The Java(TM) library for Parallel, Distributed, 
 *            Concurrent computing with Security and Mobility
 * 
 * Copyright (C) 1997-2007 INRIA/University of Nice-Sophia Antipolis
 * Contact: proactive@objectweb.org
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *  
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *  
 *  Initial developer(s):               The ProActive Team
 *                        http://www.inria.fr/oasis/ProActive/contacts.html
 *  Contributor(s): 
 * 
 * ################################################################
 */ 
package org.objectweb.proactive.ext.security.crypto;

import java.security.*;


public class RandomLongGenerator {
    private byte[] seed;
    private SecureRandom secureRandom;

    public RandomLongGenerator() {
        secureRandom = new SecureRandom();
    }

    public long generateLong(int nbBytes) {
        if (nbBytes > 8) {
            nbBytes = 8;
        }

        seed = new byte[nbBytes];
        seed = secureRandom.generateSeed(nbBytes);

        long ra2 = 0;

        for (int i = 0; i < 4; i++) {
            ra2 = ra2 +
                ((Math.abs(new Byte(seed[i]).longValue())) * new Double(Math.pow(
                        10, (-3 + (3 * (i + 1))))).longValue());
        }

        return ra2;
    }
}

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