1 /* 2 * Copyright (c) 1998, 2003, 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 /** 25 * @test 26 * @bug 4168409 27 * @summary SecureRandom forces all instances to self-seed, even if a seed is 28 * provided 29 */ 30 31 import java.security.SecureRandom; 32 33 public class SelfSeed { 34 35 private static final int NUM_BYTES = 5; 36 private static byte seed[] = { (byte)0xaa, (byte)0x11, (byte)0xa1 }; 37 38 public static void main(String[] args) { 39 40 try { 41 SecureRandom sr1 = SecureRandom.getInstance("SHA1PRNG"); 42 sr1.setSeed(seed); 43 byte randomBytes[] = new byte[NUM_BYTES]; 44 sr1.nextBytes(randomBytes); 45 46 SecureRandom sr2 = new SecureRandom(seed); 47 if (sr2.getAlgorithm().equals("SHA1PRNG") == false) { 48 System.out.println("Default PRNG is not SHA1PRNG, skipping test"); 49 return; 50 } 51 byte otherRandomBytes[] = new byte[NUM_BYTES]; 52 sr2.nextBytes(otherRandomBytes); 53 54 // make sure the random bytes generated are the same 55 for (int i = 0; i < NUM_BYTES; i++) { 56 if (randomBytes[i] != otherRandomBytes[i]) 57 throw new SecurityException("FAILURE: " + 58 "Returned bytes not equal"); 59 } 60 61 // success 62 } catch (Exception e) { 63 throw new SecurityException("FAILURE: " + e.toString()); 64 } 65 } 66 }