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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.attr;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.bouncycastle.bcpg.UserAttributeSubpacket;
import org.bouncycastle.bcpg.UserAttributeSubpacketTags;

/**
 * Basic type for a image attribute packet.
 */
public class ImageAttribute 
    extends UserAttributeSubpacket
{
    public static final int JPEG = 1;

    private static final byte[] ZEROES = new byte[12];

    private int     hdrLength;
    private int     version;
    private int     encoding;
    private byte[]  imageData;

    public ImageAttribute(
        byte[]    data)
    {
        this(false, data);
    }

    public ImageAttribute(
        boolean   forceLongLength,
        byte[]    data)
    {
        super(UserAttributeSubpacketTags.IMAGE_ATTRIBUTE, forceLongLength, data);
        
        hdrLength = ((data[1] & 0xff) << 8) | (data[0] & 0xff);
        version = data[2] & 0xff;
        encoding = data[3] & 0xff;
        
        imageData = new byte[data.length - hdrLength];
        System.arraycopy(data, hdrLength, imageData, 0, imageData.length);
    }

    public ImageAttribute(
        int imageType,
        byte[] imageData)
    {
        this(toByteArray(imageType, imageData));
    }

    private static byte[] toByteArray(int imageType, byte[] imageData)
    {
        ByteArrayOutputStream bOut = new ByteArrayOutputStream();

        try
        {
            bOut.write(0x10); bOut.write(0x00); bOut.write(0x01);
            bOut.write(imageType);
            bOut.write(ZEROES);
            bOut.write(imageData);
        }
        catch (IOException e)
        {
            throw new RuntimeException("unable to encode to byte array!");
        }

        return bOut.toByteArray();
    }

    public int version()
    {
        return version;
    }
    
    public int getEncoding()
    {
        return encoding;
    }
    
    public byte[] getImageData()
    {
        return imageData;
    }
}