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

import org.bouncycastle.bcpg.BCPGInputStream;

class Util
{
    static BCPGInputStream createBCPGInputStream(InputStream pgIn, int tag1)
        throws IOException
    {
        BCPGInputStream bcIn = new BCPGInputStream(pgIn);

        if (bcIn.nextPacketTag() == tag1)
        {
            return bcIn;
        }

        throw new IOException("unexpected tag " + bcIn.nextPacketTag() + " encountered");
    }

    static BCPGInputStream createBCPGInputStream(InputStream pgIn, int tag1, int tag2)
        throws IOException
    {
        BCPGInputStream bcIn = new BCPGInputStream(pgIn);

        if (bcIn.nextPacketTag() == tag1 || bcIn.nextPacketTag() == tag2)
        {
            return bcIn;
        }

        throw new IOException("unexpected tag " + bcIn.nextPacketTag() + " encountered");
    }

    static void encodePGPSignatures(OutputStream stream, List sigs, boolean forTransfer)
        throws IOException
    {
        for (int i = 0; i != sigs.size(); i++)
        {
            ((PGPSignature)sigs.get(i)).encode(stream, forTransfer);
        }
    }
}