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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 FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.bcpg;

import java.io.IOException;
import java.io.OutputStream;

/**
 * Basic type for a PGP Signature sub-packet.
 */
public class SignatureSubpacket 
{
    int               type;
    boolean           critical;
    boolean           isLongLength;
    protected byte[]  data;

    protected SignatureSubpacket(
        int           type,
        boolean       critical,
        boolean       isLongLength,
        byte[]        data)
    {    
        this.type = type;
        this.critical = critical;
        this.isLongLength = isLongLength;
        this.data = data;
    }
    
    public int getType()
    {
        return type;
    }
    
    public boolean isCritical()
    {
        return critical;
    }

    public boolean isLongLength()
    {
        return isLongLength;
    }

    /**
     * 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 (isLongLength)
        {
            out.write(0xff);
            out.write((byte)(bodyLen >> 24));
            out.write((byte)(bodyLen >> 16));
            out.write((byte)(bodyLen >> 8));
            out.write((byte)bodyLen);
        }
        else
        {
            if (bodyLen < 192)
            {
                out.write((byte)bodyLen);
            }
            else if (bodyLen <= 8383)
            {
                bodyLen -= 192;

                out.write((byte)(((bodyLen >> 8) & 0xff) + 192));
                out.write((byte)bodyLen);
            }
            else
            {
                out.write(0xff);
                out.write((byte)(bodyLen >> 24));
                out.write((byte)(bodyLen >> 16));
                out.write((byte)(bodyLen >> 8));
                out.write((byte)bodyLen);
            }
        }
        
        if (critical)
        {
            out.write(0x80 | type);
        }
        else
        {
            out.write(type);
        }
        
        out.write(data);
    }
}