/*

 * 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());

        }

    }

}