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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 JDK 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.pqc.jcajce.interfaces;

import java.security.PrivateKey;

/**
 * Base interface for an XMSS private key
 */
public interface XMSSPrivateKey
    extends XMSSKey, PrivateKey
{
    /**
     * Return the number of usages left for the private key.
     *
     * @return the number of times the key can be used before it is exhausted.
     */
    long getUsagesRemaining();
}