1/*
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/**
25 * @test
26 * @bug 6738532
27 * @summary Check EllipticCurve.equals() does not compare seed value of curve.
28 * @author Mike StJohns
29 * @key randomness
30 */
31
32import java.security.spec.*;
33import java.math.BigInteger;
34import java.util.Random;
35
36public class EllipticCurveMatch {
37    static String primeP256 =
38        "0FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF";
39    static String aP256 =
40        "0FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC";
41    static String bP256 =
42        "05AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B";
43    static String seedP256 =
44        "0C49D360886E704936A6678E1139D26B7819F7E90";
45
46    private static EllipticCurve addSeedToCurve(EllipticCurve curve)
47    {
48        Random rand = new Random();
49        byte[] seed = new byte[12];
50        rand.nextBytes(seed);
51
52        return new EllipticCurve (curve.getField(), curve.getA(), curve.getB(),
53            seed);
54    }
55
56    private static EllipticCurve getP256Curve()
57    {
58        ECFieldFp field = new ECFieldFp(new BigInteger (primeP256,16));
59        BigInteger a = new BigInteger (aP256, 16);
60        BigInteger b = new BigInteger (bP256, 16);
61
62        return new EllipticCurve (field, a, b);
63    }
64
65    public static void main (String[] argv) throws Exception {
66        EllipticCurve firstCurve = getP256Curve();
67        EllipticCurve secondCurve = addSeedToCurve(firstCurve);
68        EllipticCurve thirdCurve = addSeedToCurve(firstCurve);
69
70        if (!firstCurve.equals(firstCurve))
71            throw new Exception("Original curve doesn't equal itself");
72
73        if (!firstCurve.equals(secondCurve))
74            throw new Exception ("Original curve doesn't equal seeded curve");
75
76        if (!secondCurve.equals(secondCurve))
77            throw new Exception ("Seeded curve doesn't equal itself");
78
79        if (!secondCurve.equals(thirdCurve))
80            throw new Exception ("Seeded curve doesn't equal differently " +
81                "seeded curve");
82        System.out.println("Curve equals test passed");
83    }
84}
85