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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.
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package org.bouncycastle.openpgp.operator.jcajce;

import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.Date;

import org.bouncycastle.bcpg.PublicKeyPacket;
import org.bouncycastle.openpgp.PGPAlgorithmParameters;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPKeyPair;
import org.bouncycastle.openpgp.PGPPrivateKey;
import org.bouncycastle.openpgp.PGPPublicKey;

/**
 * A PGP key pair class that is constructed from JCA/JCE key pairs.
 */
public class JcaPGPKeyPair
    extends PGPKeyPair
{
    @Deprecated
    private static PGPPublicKey getPublicKey(int algorithm, PublicKey pubKey, Date date)
        throws PGPException
    {
        return getPublicKey(PublicKeyPacket.VERSION_4, algorithm, pubKey, date);
    }

    private static PGPPublicKey getPublicKey(int version, int algorithm, PublicKey pubKey, Date date)
        throws PGPException
    {
        return new JcaPGPKeyConverter().getPGPPublicKey(version, algorithm, pubKey, date);
    }

    @Deprecated
    private static PGPPublicKey getPublicKey(int algorithm, PGPAlgorithmParameters algorithmParameters, PublicKey pubKey, Date date)
        throws PGPException
    {
        return getPublicKey(PublicKeyPacket.VERSION_4, algorithm, algorithmParameters, pubKey, date);
    }
    
    private static PGPPublicKey getPublicKey(int version, int algorithm, PGPAlgorithmParameters algorithmParameters, PublicKey pubKey, Date date)
        throws PGPException
    {
        return new JcaPGPKeyConverter().getPGPPublicKey(version, algorithm, algorithmParameters, pubKey, date);
    }

    private static PGPPrivateKey getPrivateKey(PGPPublicKey pub, PrivateKey privKey)
        throws PGPException
    {
        return new JcaPGPKeyConverter().getPGPPrivateKey(pub, privKey);
    }

    /**
     * Construct version 4 PGP key pair from a JCA/JCE key pair.
     *
     * @param algorithm the PGP algorithm the key is for.
     * @param keyPair  the public/private key pair to convert.
     * @param date the creation date to associate with the key pair.
     * @throws PGPException if conversion fails.
     * @deprecated use versioned {@link #JcaPGPKeyPair(int, int, KeyPair, Date)} instead
     */
    @Deprecated
    public JcaPGPKeyPair(int algorithm, KeyPair keyPair, Date date)
        throws PGPException
    {
        this(PublicKeyPacket.VERSION_4, algorithm, keyPair, date);
    }

    /**
     * Construct PGP key pair from a JCA/JCE key pair.
     *
     * @param version   key version.
     * @param algorithm the PGP algorithm the key is for.
     * @param keyPair  the public/private key pair to convert.
     * @param date the creation date to associate with the key pair.
     * @throws PGPException if conversion fails.
     */
    public JcaPGPKeyPair(int version, int algorithm, KeyPair keyPair, Date date)
        throws PGPException
    {
        this.pub = getPublicKey(version, algorithm, keyPair.getPublic(), date);
        this.priv = getPrivateKey(this.pub, keyPair.getPrivate());
    }

    /**
     * Construct version 4 PGP key pair from a JCA/JCE key pair.
     *
     * @param algorithm the PGP algorithm the key is for.
     * @param parameters additional parameters to be stored against the public key.
     * @param keyPair  the public/private key pair to convert.
     * @param date the creation date to associate with the key pair.
     * @throws PGPException if conversion fails.
     * @deprecated use versioned {@link #JcaPGPKeyPair(int, int, PGPAlgorithmParameters, KeyPair, Date)} instead
     */
    @Deprecated
    public JcaPGPKeyPair(int algorithm, PGPAlgorithmParameters parameters, KeyPair keyPair, Date date)
        throws PGPException
    {
        this(PublicKeyPacket.VERSION_4, algorithm, parameters, keyPair, date);
    }

    /**
     * Construct PGP key pair from a JCA/JCE key pair.
     *
     * @param version   key version.
     * @param algorithm the PGP algorithm the key is for.
     * @param parameters additional parameters to be stored against the public key.
     * @param keyPair  the public/private key pair to convert.
     * @param date the creation date to associate with the key pair.
     * @throws PGPException if conversion fails.
     */
    public JcaPGPKeyPair(int version, int algorithm, PGPAlgorithmParameters parameters, KeyPair keyPair, Date date)
        throws PGPException
    {
        this.pub = getPublicKey(version, algorithm, parameters, keyPair.getPublic(), date);
        this.priv = getPrivateKey(this.pub, keyPair.getPrivate());
    }
}