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/*
* 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.
*
* 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 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");
}
}
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