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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.bcpg;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Vector;

/**
 * Basic type for a user attribute packet.
 */
public class UserAttributePacket 
    extends ContainedPacket
{    
    private UserAttributeSubpacket[]    subpackets;

    public UserAttributePacket(
            BCPGInputStream  in)
            throws IOException
    {
        this(in, false);
    }

    public UserAttributePacket(
        BCPGInputStream  in,
        boolean newPacketFormat)
        throws IOException
    {
        super(USER_ATTRIBUTE, newPacketFormat);

        UserAttributeSubpacketInputStream     sIn = new UserAttributeSubpacketInputStream(in);
        UserAttributeSubpacket                sub;
                                        
        Vector    v= new Vector();
        while ((sub = sIn.readPacket()) != null)
        {
            v.addElement(sub);
        }
        
        subpackets = new UserAttributeSubpacket[v.size()];
            
        for (int i = 0; i != subpackets.length; i++)
        {
            subpackets[i] = (UserAttributeSubpacket)v.elementAt(i);
        }
    }
    
    public UserAttributePacket(
        UserAttributeSubpacket[]    subpackets)
    {
        super(USER_ATTRIBUTE);

        this.subpackets = subpackets;
    }
    
    public UserAttributeSubpacket[] getSubpackets()
    {
        return subpackets;
    }
    
    public void encode(
        BCPGOutputStream    out)
        throws IOException
    {
        ByteArrayOutputStream    bOut = new ByteArrayOutputStream();
        
        for (int i = 0; i != subpackets.length; i++)
        {
            subpackets[i].encode(bOut);
        }

        out.writePacket(hasNewPacketFormat(), USER_ATTRIBUTE, bOut.toByteArray());
    }
}