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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.openpgp;

import org.spongycastle.bcpg.UserAttributeSubpacket;
import org.spongycastle.bcpg.attr.ImageAttribute;

import java.util.ArrayList;
import java.util.List;

public class PGPUserAttributeSubpacketVectorGenerator
{
    private List list = new ArrayList();

    public void setImageAttribute(int imageType, byte[] imageData)
    {
        if (imageData == null)
        {
            throw new IllegalArgumentException("attempt to set null image");
        }

        list.add(new ImageAttribute(imageType, imageData));
    }

    public PGPUserAttributeSubpacketVector generate()
    {
        return new PGPUserAttributeSubpacketVector((UserAttributeSubpacket[])list.toArray(new UserAttributeSubpacket[list.size()]));
    }
}