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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.jce.interfaces;

import java.math.BigInteger;
import java.security.PrivateKey;

/**
 * interface for Elliptic Curve Private keys.
 */
public interface ECPrivateKey
    extends ECKey, PrivateKey
{
    /**
     * return the private value D.
     */
    public BigInteger getD();
}