/*

 * Copyright (c) 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

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 * questions.

 */

/**

 * @test

 * @bug 4915392

 * @summary test that the getAlgorithm() method works correctly

 * @author Andreas Sterbenz

 */

import java.io.*;

import java.security.*;

public class GetAlgorithm {

    private final static String BASE = System.getProperty("test.src", ".");

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

        SecureRandom sr;

        sr = new SecureRandom();

        if (sr.getAlgorithm().equals("unknown")) {

            throw new Exception("Unknown: " + sr.getAlgorithm());

        }

        sr = SecureRandom.getInstance("SHA1PRNG");

        check("SHA1PRNG", sr);

//      OutputStream out = new FileOutputStream("sha1prng.bin");

//      ObjectOutputStream oout = new ObjectOutputStream(out);

//      sr.nextInt();

//      oout.writeObject(sr);

//      oout.flush();

//      oout.close();

        sr = new MySecureRandom();

        check("unknown", sr);

        InputStream in = new FileInputStream(new File(BASE, "sha1prng-old.bin"));

        ObjectInputStream oin = new ObjectInputStream(in);

        sr = (SecureRandom)oin.readObject();

        oin.close();

        check("unknown", sr);

        in = new FileInputStream(new File(BASE, "sha1prng-new.bin"));

        oin = new ObjectInputStream(in);

        sr = (SecureRandom)oin.readObject();

        oin.close();

        check("SHA1PRNG", sr);

        System.out.println("All tests passed");

    }

    private static void check(String s1, SecureRandom sr) throws Exception {

        String s2 = sr.getAlgorithm();

        if (s1.equals(s2) == false) {

            throw new Exception("Expected " + s1 + ", got " + s2);

        }

    }

    private static class MySecureRandom extends SecureRandom {

    }

}