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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.cms;

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

import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.cms.CMSObjectIdentifiers;

/**
 * a class representing null or absent content.
 */
public class CMSAbsentContent
    implements CMSTypedData, CMSReadable
{
    private final ASN1ObjectIdentifier type;

    public CMSAbsentContent()
    {
        this(new ASN1ObjectIdentifier(CMSObjectIdentifiers.data.getId()));
    }

    public CMSAbsentContent(
        ASN1ObjectIdentifier type)
    {
        this.type = type;
    }

    public InputStream getInputStream()
    {
        return null;
    }

    public void write(OutputStream zOut)
        throws IOException, CMSException
    {
        // do nothing
    }

    public Object getContent()
    {
        return null;
    }

    public ASN1ObjectIdentifier getContentType()
    {
        return type;
    }
}