| /* |
| * 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(); |
| } |
| } |
| } |