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 to JDK 1.8.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.math.ec;

public class SimpleLookupTable
    implements ECLookupTable
{
    private static ECPoint[] copy(ECPoint[] points, int off, int len)
    {
        ECPoint[] result = new ECPoint[len];
        for (int i = 0; i < len; ++i)
        {
            result[i] = points[off + i];
        }
        return result;
    }
    
    private final ECPoint[] points;

    public SimpleLookupTable(ECPoint[] points, int off, int len)
    {
        this.points = copy(points, off, len);
    }

    public int getSize()
    {
        return points.length;
    }

    public ECPoint lookup(int index)
    {
        return points[index];
    }
}