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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.4. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
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package org.bouncycastle.cms;

import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.DeflaterOutputStream;

import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.BERSequenceGenerator;
import org.bouncycastle.asn1.DERSequenceGenerator;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.operator.OutputCompressor;

/**
 * General class for generating a compressed CMS message stream.
 * 
 * A simple example of usage.
 * 
 *  *      CMSCompressedDataStreamGenerator gen = new CMSCompressedDataStreamGenerator();
 *      
 *      OutputStream cOut = gen.open(outputStream, new ZlibCompressor());
 *      
 *      cOut.write(data);
 *      
 *      cOut.close();
 * 
 */
public class CMSCompressedDataStreamGenerator
{
    public static final String  ZLIB    = "1.2.840.113549.1.9.16.3.8";

    private int _bufferSize;
    
    /**
     * base constructor
     */
    public CMSCompressedDataStreamGenerator()
    {
    }

    /**
     * Set the underlying string size for encapsulated data
     *
     * @param bufferSize length of octet strings to buffer the data.
     */
    public void setBufferSize(
        int bufferSize)
    {
        _bufferSize = bufferSize;
    }

    /**
     * @deprecated use open(OutputStream, ContentCompressor)
     */
    public OutputStream open(
        OutputStream out,
        String       compressionOID) 
        throws IOException
    {
        return open(out, CMSObjectIdentifiers.data.getId(), compressionOID);
    }

    /**
     * @deprecated use open(OutputStream, ASN1ObjectIdentifier, ContentCompressor)
     */
    public OutputStream open(
        OutputStream  out,        
        String        contentOID,
        String        compressionOID) 
        throws IOException
    {
        BERSequenceGenerator sGen = new BERSequenceGenerator(out);
        
        sGen.addObject(CMSObjectIdentifiers.compressedData);
        
        //
        // Compressed Data
        //
        BERSequenceGenerator cGen = new BERSequenceGenerator(sGen.getRawOutputStream(), 0, true);
        
        cGen.addObject(new ASN1Integer(0));
        
        //
        // AlgorithmIdentifier
        //
        DERSequenceGenerator algGen = new DERSequenceGenerator(cGen.getRawOutputStream());
        
        algGen.addObject(new ASN1ObjectIdentifier(ZLIB));

        algGen.close();
        
        //
        // Encapsulated ContentInfo
        //
        BERSequenceGenerator eiGen = new BERSequenceGenerator(cGen.getRawOutputStream());
        
        eiGen.addObject(new ASN1ObjectIdentifier(contentOID));

        OutputStream octetStream = CMSUtils.createBEROctetOutputStream(
            eiGen.getRawOutputStream(), 0, true, _bufferSize);
        
        return new CmsCompressedOutputStream(
            new DeflaterOutputStream(octetStream), sGen, cGen, eiGen);
    }

    public OutputStream open(
        OutputStream out,
        OutputCompressor compressor)
        throws IOException
    {
        return open(CMSObjectIdentifiers.data, out, compressor);
    }

    /**
     * Open a compressing output stream.
     *
     * @param contentOID
     * @param out
     * @param compressor
     * @return
     * @throws IOException
     */
    public OutputStream open(
        ASN1ObjectIdentifier contentOID,
        OutputStream out,
        OutputCompressor compressor)
        throws IOException
    {
        BERSequenceGenerator sGen = new BERSequenceGenerator(out);

        sGen.addObject(CMSObjectIdentifiers.compressedData);

        //
        // Compressed Data
        //
        BERSequenceGenerator cGen = new BERSequenceGenerator(sGen.getRawOutputStream(), 0, true);

        cGen.addObject(new ASN1Integer(0));

        //
        // AlgorithmIdentifier
        //
        cGen.addObject(compressor.getAlgorithmIdentifier());

        //
        // Encapsulated ContentInfo
        //
        BERSequenceGenerator eiGen = new BERSequenceGenerator(cGen.getRawOutputStream());

        eiGen.addObject(contentOID);

        OutputStream octetStream = CMSUtils.createBEROctetOutputStream(
            eiGen.getRawOutputStream(), 0, true, _bufferSize);

        return new CmsCompressedOutputStream(
            compressor.getOutputStream(octetStream), sGen, cGen, eiGen);
    }

    private class CmsCompressedOutputStream
        extends OutputStream
    {
        private OutputStream _out;
        private BERSequenceGenerator _sGen;
        private BERSequenceGenerator _cGen;
        private BERSequenceGenerator _eiGen;
        
        CmsCompressedOutputStream(
            OutputStream out,
            BERSequenceGenerator sGen,
            BERSequenceGenerator cGen,
            BERSequenceGenerator eiGen)
        {
            _out = out;
            _sGen = sGen;
            _cGen = cGen;
            _eiGen = eiGen;
        }
        
        public void write(
            int b)
            throws IOException
        {
            _out.write(b); 
        }
        
        
        public void write(
            byte[] bytes,
            int    off,
            int    len)
            throws IOException
        {
            _out.write(bytes, off, len);
        }
        
        public void write(
            byte[] bytes)
            throws IOException
        {
            _out.write(bytes);
        }
        
        public void close()
            throws IOException
        {
            _out.close();
            _eiGen.close();
            _cGen.close();
            _sGen.close();
        }
    }
}