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.crypto.ec;

import org.bouncycastle.crypto.CipherParameters;

public interface ECPairTransform
{
    void init(CipherParameters params);

    ECPair transform(ECPair cipherText);
}