/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This 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 (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.web.security.security;
import java.security.SecureRandom;
import java.util.concurrent.CountDownLatch;
import org.exoplatform.container.xml.InitParams;
import org.picketlink.idm.api.SecureRandomProvider;
import org.picocontainer.Startable;
/**
* A central service for getting a {@link SecureRandom} that is granted to be reseeded regularly. It starts fast thanks to
* seeding the underlying {@link SecureRandom} in a dedicated initialisation thread.
*
* @author <a href="mailto:ppalaga@redhat.com">Peter Palaga</a>
*
*/
public class SecureRandomService implements Startable, SecureRandomProvider {
protected static final String RANDOM_ALGORITHM = "random.algorithm";
protected static final String RANDOM_ALGORITHM_PROVIDER = "random.algorithm.provider";
protected static final String RANDOM_RESEEDING_PERIOD_MILLISECONDS = "random.algorithm.reseeding.period.milliseconds";
protected static final String RANDOM_SEED_LENGTH_BYTES = "random.algorithm.seed.length.bytes";
private volatile AutoReseedRandom random;
private final CountDownLatch initializationLatch = new CountDownLatch(1);
private final String algorithm;
private final String algorithmProvider;
private final int seedLength;
private final long reseedingPeriod;
public SecureRandomService() {
this.algorithm = AutoReseedRandom.DEFAULT_RANDOM_ALGORITHM;
this.algorithmProvider = AutoReseedRandom.DEFAULT_RANDOM_ALGORITHM_PROVIDER;
this.seedLength = AutoReseedRandom.DEFAULT_SEED_LENGTH;
this.reseedingPeriod = AutoReseedRandom.DEFAULT_RESEEDING_PERIOD;
}
/**
*
*/
public SecureRandomService(InitParams initParams) {
super();
this.algorithm = initParams != null && initParams.containsKey(RANDOM_ALGORITHM) ? initParams.getValueParam(
RANDOM_ALGORITHM).getValue() : AutoReseedRandom.DEFAULT_RANDOM_ALGORITHM;
this.algorithmProvider = initParams != null && initParams.containsKey(RANDOM_ALGORITHM_PROVIDER) ? initParams
.getValueParam(RANDOM_ALGORITHM_PROVIDER).getValue() : AutoReseedRandom.DEFAULT_RANDOM_ALGORITHM_PROVIDER;
this.seedLength = initParams != null && initParams.containsKey(RANDOM_SEED_LENGTH_BYTES) ? Integer.parseInt(initParams
.getValueParam(RANDOM_SEED_LENGTH_BYTES).getValue()) : AutoReseedRandom.DEFAULT_SEED_LENGTH;
this.reseedingPeriod = initParams != null && initParams.containsKey(RANDOM_RESEEDING_PERIOD_MILLISECONDS) ? Long
.parseLong(initParams.getValueParam(RANDOM_RESEEDING_PERIOD_MILLISECONDS).getValue())
: AutoReseedRandom.DEFAULT_RESEEDING_PERIOD;
}
public SecureRandom getSecureRandom() {
/* wait until the random instance was initialized */
try {
initializationLatch.await();
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
return random;
}
/*
* (non-Javadoc)
*
* @see org.picocontainer.Startable#start()
*/
@Override
public void start() {
Thread t = new Thread(new Runnable() {
@Override
public void run() {
SecureRandomService.this.random = new AutoReseedRandom(SecureRandomService.this.algorithm,
SecureRandomService.this.algorithmProvider, SecureRandomService.this.seedLength,
SecureRandomService.this.reseedingPeriod);
initializationLatch.countDown();
}
}, SecureRandomService.class.getSimpleName() + " initialization");
/* Make a daemon out of t so that the VM can be shut down before t completes */
t.setDaemon(true);
t.start();
}
/*
* (non-Javadoc)
*
* @see org.picocontainer.Startable#stop()
*/
@Override
public void stop() {
/* nothing to do */
}
}