1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.math.BigInteger; 25 import java.security.NoSuchAlgorithmException; 26 import java.security.SecureRandom; 27 import java.security.Security; 28 import java.util.concurrent.Callable; 29 import java.util.concurrent.CompletionService; 30 import java.util.concurrent.CountDownLatch; 31 import java.util.concurrent.ExecutionException; 32 import java.util.concurrent.ExecutorCompletionService; 33 import java.util.concurrent.ExecutorService; 34 import java.util.concurrent.Executors; 35 import java.util.concurrent.ThreadFactory; 36 import static java.lang.Math.*; 37 38 /* 39 * @test 40 * @bug 8141039 41 * @library /lib/testlibrary 42 * @summary Test behavior of a shared SecureRandom object when it is operated 43 * by multiple threads concurrently. 44 * @run main/othervm -Djava.security.egd=file:/dev/urandom MultiThreadTest 45 */ 46 public class MultiThreadTest { 47 48 private static final byte[] GEN_RND_BYTES = {1}; 49 private static final String DRBG_CONFIG = "securerandom.drbg.config"; 50 private static final String DRBG_CONFIG_VALUE 51 = Security.getProperty(DRBG_CONFIG); 52 53 private enum SEED { 54 55 NONE, RESEED, SETSEED 56 } 57 main(String[] args)58 public static void main(String[] args) { 59 60 boolean success = true; 61 for (int byteLen : GEN_RND_BYTES) { 62 for (SEED reSeed : SEED.values()) { 63 for (String mech : new String[]{ 64 "SHA1PRNG", "Hash_DRBG", "HMAC_DRBG", "CTR_DRBG"}) { 65 try { 66 forEachMech(mech, byteLen, reSeed); 67 } catch (Exception e) { 68 success = false; 69 e.printStackTrace(System.out); 70 } finally { 71 Security.setProperty(DRBG_CONFIG, DRBG_CONFIG_VALUE); 72 } 73 } 74 } 75 } 76 77 if (!success) { 78 throw new RuntimeException("At least one test failed."); 79 } 80 } 81 82 /** 83 * Generate a number of threads to fetch random numbers of certain bits 84 * generated through a shared SecureRandom instance. 85 * @param mech Mechanism name 86 * @param byteLen Number of bytes of random number to produce 87 * @param reSeed Call reseed() before generating random numbers 88 * @throws NoSuchAlgorithmException 89 * @throws InterruptedException 90 * @throws ExecutionException 91 */ forEachMech(String mech, int byteLen, SEED reSeed)92 private static void forEachMech(String mech, int byteLen, SEED reSeed) 93 throws NoSuchAlgorithmException, InterruptedException, 94 ExecutionException { 95 96 if ("SHA1PRNG".equals(mech) && SEED.RESEED.equals(reSeed)) { 97 System.out.printf( 98 "%nreseed() api is not supported for '%s'", mech); 99 return; 100 } 101 System.out.printf("%nTest SecureRandom mechanism: '%s' with support of" 102 + " reseed: '%s'", mech, reSeed); 103 int threadCount = (int) pow(2, 8 * byteLen); 104 System.out.printf("%nCreating %s number of threads to generate secure " 105 + "random numbers concurrently.", threadCount); 106 107 ExecutorService executor 108 = Executors.newCachedThreadPool(new ThreadFactory() { 109 @Override 110 public Thread newThread(Runnable r) { 111 Thread t = Executors.defaultThreadFactory() 112 .newThread(r); 113 t.setDaemon(true); 114 return t; 115 } 116 }); 117 CompletionService<Integer> completionService 118 = new ExecutorCompletionService<Integer>(executor); 119 120 CountDownLatch latch = new CountDownLatch(1); 121 SecureRandom rnd = null; 122 if (!mech.contains("_DRBG")) { 123 rnd = SecureRandom.getInstance(mech); 124 } else { 125 Security.setProperty(DRBG_CONFIG, mech); 126 rnd = SecureRandom.getInstance("DRBG"); 127 } 128 try { 129 for (int i = 0; i < threadCount; i++) { 130 completionService.submit(new Task(rnd, latch, byteLen, reSeed)); 131 } 132 latch.countDown(); 133 134 for (int i = 0; i < threadCount; i++) { 135 completionService.take(); 136 } 137 } finally { 138 executor.shutdown(); 139 } 140 System.out.printf("%nCompleted Test for algorithm '%s' with thread " 141 + "counts to '%s' using reseeding '%s'", 142 mech, threadCount, reSeed); 143 144 } 145 146 /** 147 * Define a Task to be executed by multiple thread to produce random numbers 148 * from a shared SecureRandom instance. 149 */ 150 private static class Task implements Callable<Integer> { 151 152 private final SecureRandom random; 153 private final CountDownLatch latch; 154 private final SEED reSeed; 155 private final int byteSize; 156 Task(SecureRandom random, CountDownLatch latch, int byteSize, SEED reSeed)157 public Task(SecureRandom random, CountDownLatch latch, int byteSize, 158 SEED reSeed) { 159 this.random = random; 160 this.latch = latch; 161 this.byteSize = byteSize; 162 this.reSeed = reSeed; 163 } 164 165 @Override call()166 public Integer call() throws Exception { 167 latch.await(); 168 switch (this.reSeed) { 169 case RESEED: 170 this.random.reseed(); 171 break; 172 case SETSEED: 173 this.random.setSeed(1l); 174 break; 175 } 176 byte[] bytes = new byte[byteSize]; 177 random.nextBytes(bytes); 178 return new BigInteger(bytes).intValue(); 179 } 180 } 181 182 } 183