/*

 * Copyright (c) 2011, 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.

 *

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 */

/**

 * @test

 * @bug 6738532

 * @summary Check EllipticCurve.equals() does not compare seed value of curve.

 * @author Mike StJohns

 * @key randomness

 */

import java.security.spec.*;

import java.math.BigInteger;

import java.util.Random;

public class EllipticCurveMatch {

    static String primeP256 =

        "0FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF";

    static String aP256 =

        "0FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC";

    static String bP256 =

        "05AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B";

    static String seedP256 =

        "0C49D360886E704936A6678E1139D26B7819F7E90";

    private static EllipticCurve addSeedToCurve(EllipticCurve curve)

    {

        Random rand = new Random();

        byte[] seed = new byte[12];

        rand.nextBytes(seed);

        return new EllipticCurve (curve.getField(), curve.getA(), curve.getB(),

            seed);

    }

    private static EllipticCurve getP256Curve()

    {

        ECFieldFp field = new ECFieldFp(new BigInteger (primeP256,16));

        BigInteger a = new BigInteger (aP256, 16);

        BigInteger b = new BigInteger (bP256, 16);

        return new EllipticCurve (field, a, b);

    }

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

        EllipticCurve firstCurve = getP256Curve();

        EllipticCurve secondCurve = addSeedToCurve(firstCurve);

        EllipticCurve thirdCurve = addSeedToCurve(firstCurve);

        if (!firstCurve.equals(firstCurve))

            throw new Exception("Original curve doesn't equal itself");

        if (!firstCurve.equals(secondCurve))

            throw new Exception ("Original curve doesn't equal seeded curve");

        if (!secondCurve.equals(secondCurve))

            throw new Exception ("Seeded curve doesn't equal itself");

        if (!secondCurve.equals(thirdCurve))

            throw new Exception ("Seeded curve doesn't equal differently " +

                "seeded curve");

        System.out.println("Curve equals test passed");

    }

}