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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.openpgp;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.spongycastle.bcpg.BCPGInputStream;
import org.spongycastle.bcpg.Packet;
import org.spongycastle.bcpg.PacketTags;
import org.spongycastle.bcpg.SignaturePacket;
import org.spongycastle.bcpg.TrustPacket;
import org.spongycastle.bcpg.UserAttributePacket;
import org.spongycastle.bcpg.UserIDPacket;

public abstract class PGPKeyRing
{
    PGPKeyRing()
    {
    }

    static BCPGInputStream wrap(InputStream in)
    {
        if (in instanceof BCPGInputStream)
        {
            return (BCPGInputStream)in;
        }

        return new BCPGInputStream(in);
    }

    static TrustPacket readOptionalTrustPacket(
        BCPGInputStream pIn)
        throws IOException
    {
        return (pIn.nextPacketTag() == PacketTags.TRUST)
            ?   (TrustPacket) pIn.readPacket()
            :   null;
    }

    static List readSignaturesAndTrust(
        BCPGInputStream pIn)
        throws IOException
    {
        try
        {
            List sigList = new ArrayList();

            while (pIn.nextPacketTag() == PacketTags.SIGNATURE)
            {
                SignaturePacket signaturePacket = (SignaturePacket)pIn.readPacket();
                TrustPacket trustPacket = readOptionalTrustPacket(pIn);

                sigList.add(new PGPSignature(signaturePacket, trustPacket));
            }

            return sigList;
        }
        catch (PGPException e)
        {
            throw new IOException("can't create signature object: " + e.getMessage()
                + ", cause: " + e.getUnderlyingException().toString());
        }
    }

    static void readUserIDs(
        BCPGInputStream pIn,
        List ids,
        List idTrusts,
        List idSigs)
        throws IOException
    {
        while (pIn.nextPacketTag() == PacketTags.USER_ID
            || pIn.nextPacketTag() == PacketTags.USER_ATTRIBUTE)
        {
            Packet obj = pIn.readPacket();
            if (obj instanceof UserIDPacket)
            {
                UserIDPacket id = (UserIDPacket)obj;
                ids.add(id);
            }
            else
            {
                UserAttributePacket user = (UserAttributePacket)obj;
                ids.add(new PGPUserAttributeSubpacketVector(user.getSubpackets()));
            }

            idTrusts.add(readOptionalTrustPacket(pIn));
            idSigs.add(readSignaturesAndTrust(pIn));
        }
    }

    /**
        * Return the first public key in the ring.  In the case of a {@link PGPSecretKeyRing}
        * this is also the public key of the master key pair.
        *
        * @return PGPPublicKey
        */
    public abstract PGPPublicKey getPublicKey();

    /**
        * Return an iterator containing all the public keys.
        *
        * @return Iterator
        */
    public abstract Iterator getPublicKeys();

    /**
        * Return the public key referred to by the passed in keyID if it
        * is present.
        *
        * @param keyID
        * @return PGPPublicKey
        */
    public abstract PGPPublicKey getPublicKey(long keyID);

    public abstract void encode(OutputStream outStream)
        throws IOException;

    public abstract byte[] getEncoded()
        throws IOException;

}