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The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.openpgp.api;

import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPKeyPair;
import org.bouncycastle.openpgp.operator.PGPKeyPairGenerator;

/**
 * Callback to generate a {@link PGPKeyPair} from a {@link PGPKeyPairGenerator} instance.
 */
@FunctionalInterface
public interface KeyPairGeneratorCallback
{
    /**
     * Generate a {@link PGPKeyPair} by calling a factory method on a given generator instance.
     *
     * @param generator PGPKeyPairGenerator
     * @return generated key pair
     * @throws PGPException
     */
    PGPKeyPair generateFrom(PGPKeyPairGenerator generator)
        throws PGPException;
}