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/*
* Copyright (C) 2009 The Android Open Source Project
*
* 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 tests.security;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import junit.framework.TestCase;
public abstract class SecureRandomTest extends TestCase {
private final String algorithmName;
private int counter = 0;
protected SecureRandomTest(String name) {
this.algorithmName = name;
}
protected void setUp() throws Exception {
super.setUp();
}
public void testSecureRandom() {
SecureRandom secureRandom1 = null;
try {
secureRandom1 = SecureRandom.getInstance(algorithmName);
} catch (NoSuchAlgorithmException e) {
fail(e.getMessage());
}
SecureRandom secureRandom2 = null;
try {
secureRandom2 = SecureRandom.getInstance(algorithmName);
} catch (NoSuchAlgorithmException e) {
fail(e.getMessage());
}
byte[] testRandom1 = getRandomBytes(secureRandom1);
byte[] testRandom2 = getRandomBytes(secureRandom2);
assertFalse(Arrays.equals(testRandom1, testRandom2));
}
private byte[] getRandomBytes(SecureRandom random) {
byte[] randomData = new byte[64];
random.setSeed(System.currentTimeMillis()+counter);
counter++;
random.nextBytes(randomData);
return randomData;
}
public void testSecureRandomThreadSafety() throws Exception {
final SecureRandom secureRandom = SecureRandom.getInstance(algorithmName);
int threads = 2;
ExecutorService executor = Executors.newFixedThreadPool(threads);
ExecutorCompletionService ecs = new ExecutorCompletionService(executor);
for (int t = 0; t < threads; t++) {
ecs.submit(new Callable<Void>() {
public Void call () {
for (int i = 0; i < 1000; i++) {
secureRandom.generateSeed(1024);
}
return null;
}
});
}
executor.shutdown();
for (int i = 0; i < threads; i++) {
ecs.take().get();
}
}
}
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