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  * @run main/othervm EllipticCurveMatch

    29  * @author Mike StJohns

    30  */

    31 

    32 import java.security.spec.*;

    33 import java.math.BigInteger;

    34 import java.security.SecureRandom;

    35 

    36 public 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         SecureRandom rand = new SecureRandom();

    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 }