/*

 * Copyright (c) 1998, 2016, 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 4102896

 * @summary Make sure that a SecureRandom object can be serialized

 * @run main/othervm Serialize

 */

import java.security.*;

import java.io.*;

public class Serialize {

    public static void main(String args[]) throws Exception {

        System.setProperty("java.security.egd", "file:/dev/urandom");

        for (String alg: new String[]{

                "SHA1PRNG", "DRBG", "Hash_DRBG", "HMAC_DRBG", "CTR_DRBG",

                "Hash_DRBG,SHA-512,192,pr_and_reseed"}) {

            System.out.println("Testing " + alg);

            SecureRandom s1;

            // A SecureRandom can be s11ned and des11ned at any time.

            // Brand new.

            s1 = getInstance(alg);

            revive(s1).nextInt();

            if (alg.contains("DRBG")) {

                revive(s1).reseed();

            }

            // Used

            s1 = getInstance(alg);

            s1.nextInt();    // state set

            revive(s1).nextInt();

            if (alg.contains("DRBG")) {

                revive(s1).reseed();

            }

            // Automatically reseeded

            s1 = getInstance(alg);

            if (alg.contains("DRBG")) {

                s1.reseed();

            }

            revive(s1).nextInt();

            if (alg.contains("DRBG")) {

                revive(s1).reseed();

            }

            // Manually seeded

            s1 = getInstance(alg);

            s1.setSeed(1L);

            revive(s1).nextInt();

            if (alg.contains("DRBG")) {

                revive(s1).reseed();

            }

        }

    }

    private static SecureRandom getInstance(String alg) throws Exception {

        if (alg.equals("SHA1PRNG") || alg.equals("DRBG")) {

            return SecureRandom.getInstance(alg);

        } else {

            String old = Security.getProperty("securerandom.drbg.config");

            try {

                Security.setProperty("securerandom.drbg.config", alg);

                return SecureRandom.getInstance("DRBG");

            } finally {

                Security.setProperty("securerandom.drbg.config", old);

            }

        }

    }

    private static SecureRandom revive(SecureRandom oldOne) throws Exception {

        ByteArrayOutputStream bout = new ByteArrayOutputStream();

        new ObjectOutputStream(bout).writeObject(oldOne);

        SecureRandom newOne = (SecureRandom) new ObjectInputStream(

                new ByteArrayInputStream(bout.toByteArray())).readObject();

        if (!oldOne.toString().equals(newOne.toString())) {

            throw new Exception(newOne + " is not " + oldOne);

        }

        return newOne;

    }

}