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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.

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package org.bouncycastle.pqc.crypto;


import org.bouncycastle.crypto.params.AsymmetricKeyParameter;

/**
 * Base interface for a PQC stateful signature algorithm.
 */
public interface StateAwareMessageSigner
    extends MessageSigner
{
    /**
     * Return the current version of the private key with the updated state.
     * 
     * Note: calling this method will effectively disable the Signer from being used for further
     *  signature generation without another call to init().
     * 
     * @return an updated private key object, which can be used for later signature generation.
     */
    public AsymmetricKeyParameter getUpdatedPrivateKey();
}