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/***************************************************************************
* Copyright (c) 2004 - 2009 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.util.security;
import org.eclipse.net4j.util.ReflectUtil.ExcludeFromDump;
import org.eclipse.net4j.util.lifecycle.Lifecycle;
import java.security.SecureRandom;
/**
* @author Eike Stepper
*/
public class Randomizer extends Lifecycle implements IRandomizer
{
public static final String ALGORITHM_SHA1PRNG = "SHA1PRNG";
public static final String DEFAULT_ALGORITHM_NAME = ALGORITHM_SHA1PRNG;
private String algorithmName = DEFAULT_ALGORITHM_NAME;
private String providerName;
@ExcludeFromDump
private byte[] seed;
@ExcludeFromDump
private transient SecureRandom secureRandom;
public Randomizer()
{
}
public synchronized String getAlgorithmName()
{
return algorithmName;
}
public synchronized void setAlgorithmName(String algorithmName)
{
this.algorithmName = algorithmName;
}
public synchronized String getProviderName()
{
return providerName;
}
public synchronized void setProviderName(String providerName)
{
this.providerName = providerName;
}
public synchronized void setSeed(byte[] seed)
{
this.seed = seed;
if (isActive())
{
setSeed();
}
}
public synchronized void setSeed(long seed)
{
setSeed(String.valueOf(seed).getBytes());
}
public synchronized boolean nextBoolean()
{
checkActive();
return secureRandom.nextBoolean();
}
public synchronized double nextDouble()
{
checkActive();
return secureRandom.nextDouble();
}
public synchronized float nextFloat()
{
checkActive();
return secureRandom.nextFloat();
}
public synchronized double nextGaussian()
{
checkActive();
return secureRandom.nextGaussian();
}
public synchronized int nextInt()
{
checkActive();
return secureRandom.nextInt();
}
public synchronized int nextInt(int n)
{
checkActive();
return secureRandom.nextInt(n);
}
public synchronized long nextLong()
{
checkActive();
return secureRandom.nextLong();
}
public synchronized byte[] generateSeed(int numBytes)
{
checkActive();
return secureRandom.generateSeed(numBytes);
}
public synchronized String getAlgorithm()
{
checkActive();
return secureRandom.getAlgorithm();
}
public synchronized void nextBytes(byte[] bytes)
{
checkActive();
secureRandom.nextBytes(bytes);
}
public synchronized String nextString(int length, String alphabet)
{
checkActive();
int n = alphabet.length();
StringBuilder builder = new StringBuilder();
for (int i = 0; i < length; i++)
{
int pos = nextInt(n);
char c = alphabet.charAt(pos);
builder.append(c);
}
return builder.toString();
}
@Override
protected void doBeforeActivate() throws Exception
{
super.doBeforeActivate();
checkState(algorithmName, "algorithmName");
if (seed == null)
{
setSeed(System.currentTimeMillis());
}
}
@Override
protected void doActivate() throws Exception
{
super.doActivate();
if (providerName == null)
{
secureRandom = SecureRandom.getInstance(algorithmName);
}
else
{
secureRandom = SecureRandom.getInstance(algorithmName, providerName);
}
setSeed();
}
@Override
protected void doDeactivate() throws Exception
{
secureRandom = null;
super.doDeactivate();
}
private void setSeed()
{
secureRandom.setSeed(seed);
}
}
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