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Random number generators, probability distributions, combinatorics and statistics for Java.

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// ============================================================================
//   Copyright 2006-2012 Daniel W. Dyer
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.
// ============================================================================
package org.uncommons.maths.random;

import java.security.SecureRandom;

/**
 * {@link SeedGenerator} implementation that uses Java's bundled
 * {@link SecureRandom} RNG to generate random seed data.
 *
 * The advantage of using SecureRandom for seeding but not as the
 * primary RNG is that we can use it to seed RNGs that are much faster
 * than SecureRandom.
 *
 * This is the only seeding strategy that is guaranteed to work on all
 * platforms and therefore is provided as a fall-back option should
 * none of the other provided {@link SeedGenerator} implementations be
 * useable.
 * @author Daniel Dyer
 */
public class SecureRandomSeedGenerator implements SeedGenerator
{
    private static final SecureRandom SOURCE = new SecureRandom();

    /**
     * {@inheritDoc}
     */
    public byte[] generateSeed(int length) throws SeedException
    {
        return SOURCE.generateSeed(length);
    }


    @Override
    public String toString()
    {
        return "java.security.SecureRandom";
    }
}