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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.IOException;
import java.io.OutputStream;

import org.bouncycastle.util.Arrays;

/**
 * Basic type for a user attribute sub-packet.
 */
public class UserAttributeSubpacket 
{
    int                type;
    private boolean    forceLongLength;   // we preserve this as not everyone encodes length properly.
    protected byte[]   data;
    
    protected UserAttributeSubpacket(
        int            type,
        byte[]         data)
    {    
        this(type, false, data);
    }

    protected UserAttributeSubpacket(
        int            type,
        boolean        forceLongLength,
        byte[]         data)
    {
        this.type = type;
        this.forceLongLength = forceLongLength;
        this.data = data;
    }
    
    public int getType()
    {
        return type;
    }
    
    /**
     * return the generic data making up the packet.
     */
    public byte[] getData()
    {
        return data;
    }

    public void encode(
        OutputStream    out)
        throws IOException
    {
        int    bodyLen = data.length + 1;

        if (bodyLen < 192 && !forceLongLength)
        {
            out.write((byte)bodyLen);
        }
        else if (bodyLen <= 8383 && !forceLongLength)
        {
            bodyLen -= 192;

            out.write((byte)(((bodyLen >> 8) & 0xff) + 192));
            out.write((byte)bodyLen);
        }
        else
        {
            out.write(0xff);
            StreamUtil.writeBodyLen(out, bodyLen);
        }

        out.write(type);        
        out.write(data);
    }

    public boolean equals(
        Object o)
    {
        if (o == this)
        {
            return true;
        }

        if (!(o instanceof UserAttributeSubpacket))
        {
            return false;
        }

        UserAttributeSubpacket other = (UserAttributeSubpacket)o;

        return this.type == other.type
            && Arrays.areEqual(this.data, other.data);
    }

    public int hashCode()
    {
        return type ^ Arrays.hashCode(data);
    }
}