/*******************************************************************************
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 ******************************************************************************/
/*
 * Copyright 2003 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */


package at.gv.egovernment.moa.id.util;


import iaik.security.random.SeedGenerator;

import java.nio.ByteBuffer;
import java.security.SecureRandom;


/**
 * Random number generator used to generate ID's
 * @author Paul Ivancsics
 * @version $Id$
 */
public class Random {

  /** random number generator used */
	//private static SecureRandom random = new SecureRandom();
	private static SecureRandom random;
	private static SeedGenerator seedgenerator;
	
	static {
		random = iaik.security.random.SHA256FIPS186Random.getDefault();
	    seedgenerator = iaik.security.random.AutoSeedGenerator.getDefault();

		
	}
  /**
   * Creates a new random number, to be used as an ID.
   * 
   * @return random long as a String
   */
  public static String nextRandom() {
	  
	byte[] b = new byte[32]; // 32 bytes = 256 bits
	random.nextBytes(b);
		 
    ByteBuffer bb = ByteBuffer.wrap(b);
	long l = bb.getLong();
	return "" + Math.abs(l);
		

  }
  
  public static void seedRandom() {
	  
	  if (seedgenerator.seedAvailable())
		  random.setSeed(seedgenerator.getSeed());
  }
}