http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5. 
package org.bouncycastle.math.ec;

import java.math.BigInteger;

public interface ECConstants
{
    public static final BigInteger ZERO = BigInteger.valueOf(0);
    public static final BigInteger ONE = BigInteger.valueOf(1);
    public static final BigInteger TWO = BigInteger.valueOf(2);
    public static final BigInteger THREE = BigInteger.valueOf(3);
    public static final BigInteger FOUR = BigInteger.valueOf(4);
}