67 lines
2.4 KiB
Java
67 lines
2.4 KiB
Java
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/*
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* Copyright 1998-2003 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/**
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* @test
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* @bug 4168409
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* @summary SecureRandom forces all instances to self-seed, even if a seed is
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* provided
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*/
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import java.security.SecureRandom;
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public class SelfSeed {
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private static final int NUM_BYTES = 5;
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private static byte seed[] = { (byte)0xaa, (byte)0x11, (byte)0xa1 };
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public static void main(String[] args) {
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try {
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SecureRandom sr1 = SecureRandom.getInstance("SHA1PRNG");
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sr1.setSeed(seed);
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byte randomBytes[] = new byte[NUM_BYTES];
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sr1.nextBytes(randomBytes);
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SecureRandom sr2 = new SecureRandom(seed);
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if (sr2.getAlgorithm().equals("SHA1PRNG") == false) {
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System.out.println("Default PRNG is not SHA1PRNG, skipping test");
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return;
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}
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byte otherRandomBytes[] = new byte[NUM_BYTES];
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sr2.nextBytes(otherRandomBytes);
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// make sure the random bytes generated are the same
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for (int i = 0; i < NUM_BYTES; i++) {
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if (randomBytes[i] != otherRandomBytes[i])
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throw new SecurityException("FAILURE: " +
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"Returned bytes not equal");
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}
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// success
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} catch (Exception e) {
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throw new SecurityException("FAILURE: " + e.toString());
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}
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}
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}
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