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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 org.bouncycastle.util.Arrays;

public class KeyInformation
{
    private final byte[] fingerprint;
    private final long offsetToKeyID;
    private final int keyFlags;
    private final byte[] filler;
    private final byte[] keyID;

    KeyInformation(byte[] fingerprint, long offsetToKeyID, int keyFlags, byte[] filler, byte[] keyID)
    {
        this.fingerprint = Arrays.clone(fingerprint);
        this.offsetToKeyID = offsetToKeyID;
        this.keyFlags = keyFlags;
        this.filler = Arrays.clone(filler);
        this.keyID = Arrays.clone(keyID);
    }

    static KeyInformation getInstance(Object src, int expectedSize, int base)
        throws IOException
    {

        if (src instanceof KeyInformation)
        {
            return (KeyInformation)src;
        }


        KeyBoxByteBuffer buffer = KeyBoxByteBuffer.wrap(src);


        int start = buffer.position();

        byte[] fingerPrint =  buffer.bN(20);// The keys fingerprint

        long offsetToKeyID = buffer.u32();  // offset to the n-th key's keyID (a keyID is always 8 byte)
        // or 0 if not known which is the case only for X509.
        byte[] keyID = null;

        if (offsetToKeyID > 0)
        {
            keyID = buffer.rangeOf((int)(base + offsetToKeyID), (int)(base + offsetToKeyID + 8));
        }


        int keyFlags = buffer.u16(); // key flags,  bit 0 = qualified signature (not yet implemented}
        buffer.u16();  // RFU = Reserved for Future Use

        byte[] filler = buffer.bN(expectedSize - (buffer.position() - start));


        return new KeyInformation(fingerPrint, offsetToKeyID, keyFlags, filler, keyID);

    }

    public byte[] getFingerprint()
    {
        return Arrays.clone(fingerprint);
    }

    public int getKeyFlags()
    {
        return keyFlags;
    }

    public byte[] getFiller()
    {
        return Arrays.clone(filler);
    }

    public byte[] getKeyID()
    {
        return Arrays.clone(keyID);
    }
}