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.params;

import org.bouncycastle.util.Arrays;

public class DSTU4145Parameters
    extends ECDomainParameters
{
    private final byte[] dke;

    public DSTU4145Parameters(ECDomainParameters ecParameters, byte[] dke)
    {
        super(ecParameters.getCurve(), ecParameters.getG(), ecParameters.getN(), ecParameters.getH(), ecParameters.getSeed());

        this.dke = Arrays.clone(dke);
    }

    public byte[] getDKE()
    {
        return Arrays.clone(dke);
    }
}