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.endo;

import org.bouncycastle.math.ec.ECPointMap;

public interface ECEndomorphism
{
    ECPointMap getPointMap();

    boolean hasEfficientPointMap();
}