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/**
* @test
* @bug 6738532
* @summary Check EllipticCurve.equals() does not compare seed value of curve.
* @author Mike StJohns
*/
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");
}
}