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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 Java 1.8 and later with debug enabled.

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package org.bouncycastle.jce.interfaces;

import java.security.PrivateKey;
import java.security.PublicKey;

/**
 * Static/ephemeral private key (pair) for use with ECMQV key agreement
 * (Optionally provides the ephemeral public key)
 * @deprecated use MQVParameterSpec for passing the ephemeral key.
 */
public interface MQVPrivateKey
    extends PrivateKey
{
    /**
     * return the static private key.
     */
    PrivateKey getStaticPrivateKey();

    /**
     * return the ephemeral private key.
     */
    PrivateKey getEphemeralPrivateKey();

    /**
     * return the ephemeral public key (may be null).
     */
    PublicKey getEphemeralPublicKey();
}