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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;

import org.bouncycastle.bcpg.BCPGKey;
import org.bouncycastle.bcpg.KeyIdentifier;
import org.bouncycastle.bcpg.PublicKeyPacket;
import org.bouncycastle.openpgp.operator.KeyFingerPrintCalculator;

/**
 * general class to contain a private key for use with other openPGP
 * objects.
 */
public class PGPPrivateKey
{
    private long          keyID;
    private PublicKeyPacket publicKeyPacket;
    private BCPGKey privateKeyDataPacket;

    /**
     * Base constructor.
     *
     * Create a PGPPrivateKey from a keyID and the associated public/private data packets needed
     * to fully describe it.
     *
     * @param keyID keyID associated with the public key.
     * @param publicKeyPacket the public key data packet to be associated with this private key.
     * @param privateKeyDataPacket the private key data packet to be associate with this private key.
     */
    public PGPPrivateKey(
        long keyID,
        PublicKeyPacket publicKeyPacket,
        BCPGKey privateKeyDataPacket)
    {
        this.keyID = keyID;
        this.publicKeyPacket = publicKeyPacket;
        this.privateKeyDataPacket = privateKeyDataPacket;
    }

    /**
     * Return the keyID associated with the contained private key.
     * 
     * @return long
     */
    public long getKeyID()
    {
        return keyID;
    }

    public KeyIdentifier getKeyIdentifier(KeyFingerPrintCalculator fingerprintCalculator)
        throws PGPException
    {
        byte[] fingerprint = fingerprintCalculator.calculateFingerprint(publicKeyPacket);
        return new KeyIdentifier(fingerprint, PublicKeyPacket.getKeyID(publicKeyPacket, fingerprint));
    }
    
    /**
     * Return the public key packet associated with this private key, if available.
     *
     * @return associated public key packet, null otherwise.
     */
    public PublicKeyPacket getPublicKeyPacket()
    {
        return publicKeyPacket;
    }

    /**
     * Return the private key packet associated with this private key, if available.
     *
     * @return associated private key packet, null otherwise.
     */
    public BCPGKey getPrivateKeyDataPacket()
    {
        return privateKeyDataPacket;
    }
}