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/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.math.BigInteger;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import static java.lang.Math.*;
/*
* @test
* @bug 8141039
* @library /lib/testlibrary
* @summary Test behavior of a shared SecureRandom object when it is operated
* by multiple threads concurrently.
* @run main/othervm -Djava.security.egd=file:/dev/urandom MultiThreadTest
*/
public class MultiThreadTest {
private static final byte[] GEN_RND_BYTES = {1};
private static final String DRBG_CONFIG = "securerandom.drbg.config";
private static final String DRBG_CONFIG_VALUE
= Security.getProperty(DRBG_CONFIG);
private enum SEED {
NONE, RESEED, SETSEED
}
public static void main(String[] args) {
boolean success = true;
for (int byteLen : GEN_RND_BYTES) {
for (SEED reSeed : SEED.values()) {
for (String mech : new String[]{
"SHA1PRNG", "Hash_DRBG", "HMAC_DRBG", "CTR_DRBG"}) {
try {
forEachMech(mech, byteLen, reSeed);
} catch (Exception e) {
success = false;
e.printStackTrace(System.out);
} finally {
Security.setProperty(DRBG_CONFIG, DRBG_CONFIG_VALUE);
}
}
}
}
if (!success) {
throw new RuntimeException("At least one test failed.");
}
}
/**
* Generate a number of threads to fetch random numbers of certain bits
* generated through a shared SecureRandom instance.
* @param mech Mechanism name
* @param byteLen Number of bytes of random number to produce
* @param reSeed Call reseed() before generating random numbers
* @throws NoSuchAlgorithmException
* @throws InterruptedException
* @throws ExecutionException
*/
private static void forEachMech(String mech, int byteLen, SEED reSeed)
throws NoSuchAlgorithmException, InterruptedException,
ExecutionException {
if ("SHA1PRNG".equals(mech) && SEED.RESEED.equals(reSeed)) {
System.out.printf(
"%nreseed() api is not supported for '%s'", mech);
return;
}
System.out.printf("%nTest SecureRandom mechanism: '%s' with support of"
+ " reseed: '%s'", mech, reSeed);
int threadCount = (int) pow(2, 8 * byteLen);
System.out.printf("%nCreating %s number of threads to generate secure "
+ "random numbers concurrently.", threadCount);
ExecutorService executor
= Executors.newCachedThreadPool(new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread t = Executors.defaultThreadFactory()
.newThread(r);
t.setDaemon(true);
return t;
}
});
CompletionService<Integer> completionService
= new ExecutorCompletionService<Integer>(executor);
CountDownLatch latch = new CountDownLatch(1);
SecureRandom rnd = null;
if (!mech.contains("_DRBG")) {
rnd = SecureRandom.getInstance(mech);
} else {
Security.setProperty(DRBG_CONFIG, mech);
rnd = SecureRandom.getInstance("DRBG");
}
try {
for (int i = 0; i < threadCount; i++) {
completionService.submit(new Task(rnd, latch, byteLen, reSeed));
}
latch.countDown();
for (int i = 0; i < threadCount; i++) {
completionService.take();
}
} finally {
executor.shutdown();
}
System.out.printf("%nCompleted Test for algorithm '%s' with thread "
+ "counts to '%s' using reseeding '%s'",
mech, threadCount, reSeed);
}
/**
* Define a Task to be executed by multiple thread to produce random numbers
* from a shared SecureRandom instance.
*/
private static class Task implements Callable<Integer> {
private final SecureRandom random;
private final CountDownLatch latch;
private final SEED reSeed;
private final int byteSize;
public Task(SecureRandom random, CountDownLatch latch, int byteSize,
SEED reSeed) {
this.random = random;
this.latch = latch;
this.byteSize = byteSize;
this.reSeed = reSeed;
}
@Override
public Integer call() throws Exception {
latch.await();
switch (this.reSeed) {
case RESEED:
this.random.reseed();
break;
case SETSEED:
this.random.setSeed(1l);
break;
}
byte[] bytes = new byte[byteSize];
random.nextBytes(bytes);
return new BigInteger(bytes).intValue();
}
}
}
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