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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.tsp.cms;

import java.net.URI;

import org.spongycastle.asn1.DERBoolean;
import org.spongycastle.asn1.DERIA5String;
import org.spongycastle.asn1.DERUTF8String;
import org.spongycastle.asn1.cms.Attributes;
import org.spongycastle.asn1.cms.MetaData;
import org.spongycastle.cms.CMSException;
import org.spongycastle.operator.DigestCalculator;

public class CMSTimeStampedGenerator
{
    protected MetaData metaData;
    protected URI dataUri;

    /**
     * Set the dataURI to be included in message.
     *
     * @param dataUri URI for the data the initial message imprint digest is based on.
     */
    public void setDataUri(URI dataUri)
    {
        this.dataUri = dataUri;
    }

    /**
     * Set the MetaData for the generated message.
     *
     * @param hashProtected true if the MetaData should be included in first imprint calculation, false otherwise.
     * @param fileName optional file name, may be null.
     * @param mediaType optional media type, may be null.
     */
    public void setMetaData(boolean hashProtected, String fileName, String mediaType)
    {
        setMetaData(hashProtected, fileName, mediaType, null);
    }

    /**
     * Set the MetaData for the generated message.
     *
     * @param hashProtected true if the MetaData should be included in first imprint calculation, false otherwise.
     * @param fileName optional file name, may be null.
     * @param mediaType optional media type, may be null.
     * @param attributes optional attributes, may be null.
     */
    public void setMetaData(boolean hashProtected, String fileName, String mediaType, Attributes attributes)
    {
        DERUTF8String asn1FileName = null;

        if (fileName != null)
        {
            asn1FileName = new DERUTF8String(fileName);
        }

        DERIA5String asn1MediaType = null;

        if (mediaType != null)
        {
            asn1MediaType = new DERIA5String(mediaType);
        }

        setMetaData(hashProtected, asn1FileName, asn1MediaType, attributes);
    }

    private void setMetaData(boolean hashProtected, DERUTF8String fileName, DERIA5String mediaType, Attributes attributes)
    {
        this.metaData = new MetaData(new DERBoolean(hashProtected), fileName, mediaType, attributes);
    }

    /**
     * Initialise the passed in calculator with the MetaData for this message, if it is
     * required as part of the initial message imprint calculation. After initialisation the
     * calculator can then be used to calculate the initial message imprint digest for the first
     * timestamp.
     *
     * @param calculator the digest calculator to be initialised.
     * @throws CMSException if the MetaData is required and cannot be processed
     */
    public void initialiseMessageImprintDigestCalculator(DigestCalculator calculator)
        throws CMSException
    {
        MetaDataUtil util = new MetaDataUtil(metaData);

        util.initialiseMessageImprintDigestCalculator(calculator);
    }
}