| /* |
| * Copyright (c) 1998, 2003, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 4168409 |
| * @summary SecureRandom forces all instances to self-seed, even if a seed is |
| * provided |
| */ |
| |
| import java.security.SecureRandom; |
| |
| public class SelfSeed { |
| |
| private static final int NUM_BYTES = 5; |
| private static byte seed[] = { (byte)0xaa, (byte)0x11, (byte)0xa1 }; |
| |
| public static void main(String[] args) { |
| |
| try { |
| SecureRandom sr1 = SecureRandom.getInstance("SHA1PRNG"); |
| sr1.setSeed(seed); |
| byte randomBytes[] = new byte[NUM_BYTES]; |
| sr1.nextBytes(randomBytes); |
| |
| SecureRandom sr2 = new SecureRandom(seed); |
| if (sr2.getAlgorithm().equals("SHA1PRNG") == false) { |
| System.out.println("Default PRNG is not SHA1PRNG, skipping test"); |
| return; |
| } |
| byte otherRandomBytes[] = new byte[NUM_BYTES]; |
| sr2.nextBytes(otherRandomBytes); |
| |
| // make sure the random bytes generated are the same |
| for (int i = 0; i < NUM_BYTES; i++) { |
| if (randomBytes[i] != otherRandomBytes[i]) |
| throw new SecurityException("FAILURE: " + |
| "Returned bytes not equal"); |
| } |
| |
| // success |
| } catch (Exception e) { |
| throw new SecurityException("FAILURE: " + e.toString()); |
| } |
| } |
| } |