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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.gpg.keybox;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.bouncycastle.openpgp.operator.KeyFingerPrintCalculator;

/**
 * KeyBox provides an implementation of the PGP keybox.
 */
public class KeyBox
{
    private final FirstBlob firstBlob;
    private final List keyBlobs;

    public KeyBox(InputStream input, KeyFingerPrintCalculator keyFingerPrintCalculator, BlobVerifier blobVerifier)
        throws IOException
    {
        this(KeyBoxByteBuffer.wrap(input), keyFingerPrintCalculator, blobVerifier);
    }

    public KeyBox(byte[] encoding, KeyFingerPrintCalculator keyFingerPrintCalculator, BlobVerifier blobVerifier)
        throws IOException
    {
        this(KeyBoxByteBuffer.wrap(encoding), keyFingerPrintCalculator, blobVerifier);
    }

    private KeyBox(KeyBoxByteBuffer buffer, KeyFingerPrintCalculator keyFingerPrintCalculator, BlobVerifier blobVerifier)
        throws IOException
    {
        Blob blob = Blob.getInstance(buffer, keyFingerPrintCalculator, blobVerifier);
        if (blob == null)
        {
            throw new IOException("No first blob, is the source zero length?");
        }

        if (!(blob instanceof FirstBlob))
        {
            throw new IOException("First blob is not KeyBox 'First Blob'.");
        }


        FirstBlob firstBlob = (FirstBlob)blob;
        ArrayList keyBoxEntries = new ArrayList();

        for (Blob materialBlob = Blob.getInstance(buffer, keyFingerPrintCalculator, blobVerifier);
             materialBlob != null; materialBlob = Blob.getInstance(buffer, keyFingerPrintCalculator, blobVerifier))
        {
            if (materialBlob.getType() == BlobType.FIRST_BLOB)
            {
                throw new IOException("Unexpected second 'FirstBlob', there should only be one FirstBlob at the start of the file.");
            }

            keyBoxEntries.add((KeyBlob)materialBlob);
        }

        this.firstBlob = firstBlob;
        this.keyBlobs = Collections.unmodifiableList(keyBoxEntries);
    }

    public FirstBlob getFirstBlob()
    {
        return firstBlob;
    }

    public List getKeyBlobs()
    {
        return keyBlobs;
    }

}