1 /* 2 * Copyright (c) 1998, 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 /* @test 25 * @bug 4102896 26 * @summary Make sure that a SecureRandom object can be serialized 27 */ 28 29 import java.security.*; 30 import java.io.*; 31 32 public class Serialize { 33 34 public static void main(String args[]) throws Exception { 35 for (String alg: new String[]{ 36 "SHA1PRNG", "DRBG", "Hash_DRBG", "HMAC_DRBG", "CTR_DRBG"}) { 37 System.out.println("Testing " + alg); 38 39 // Even unseeded object can be serialized and deserialized 40 SecureRandom s1 = getInstance(alg); 41 revive(s1).nextInt(); 42 if (alg.contains("DRBG")) { 43 revive(s1).reseed(); 44 } 45 46 // After seeded, deserialized object should emit same random data 47 s1 = getInstance(alg); 48 s1.nextInt(); // state set 49 SecureRandom s2 = revive(s1); 50 int n1 = s1.nextInt(); 51 int n2 = s2.nextInt(); 52 if (n1 != n2) { 53 throw new Exception(); 54 } 55 56 // Or seeded with user-provided data 57 s1.setSeed(42); 58 s2.setSeed(42); 59 n1 = s1.nextInt(); 60 n2 = s2.nextInt(); 61 if (n1 != n2) { 62 throw new Exception(); 63 } 64 65 // But not after automatic reseed 66 if (alg.contains("DRBG")) { 67 s1.reseed(); 68 s2.reseed(); 69 n1 = s1.nextInt(); 70 n2 = s2.nextInt(); 71 if (n1 == n2) { 72 throw new Exception(); 73 } 74 } 75 } 76 } 77 78 private static SecureRandom getInstance(String alg) throws Exception { 79 if (alg.equals("SHA1PRNG") || alg.equals("DRBG")) { 80 return SecureRandom.getInstance(alg); 81 } else { 82 String old = Security.getProperty("drbg"); 83 try { 84 Security.setProperty("drbg", alg); 85 return SecureRandom.getInstance("DRBG"); 86 } finally { 87 Security.setProperty("drbg", old); 88 } 89 } 90 } 91 92 private static SecureRandom revive(SecureRandom sr) throws Exception { 93 ByteArrayOutputStream bout = new ByteArrayOutputStream(); 94 new ObjectOutputStream(bout).writeObject(sr); 95 return (SecureRandom) new ObjectInputStream( 96 new ByteArrayInputStream(bout.toByteArray())).readObject(); 97 } 98 }