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The Bouncy Castle Java S/MIME APIs for handling S/MIME protocols. This jar contains S/MIME APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs. The JavaMail API and the Java activation framework will also be needed.

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package org.bouncycastle.mail.smime;

import java.io.IOException;
import java.io.OutputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;

import javax.activation.CommandMap;
import javax.activation.MailcapCommandMap;
import javax.mail.MessagingException;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;

import org.bouncycastle.cms.CMSCompressedDataGenerator;
import org.bouncycastle.cms.CMSCompressedDataStreamGenerator;
import org.bouncycastle.operator.OutputCompressor;

/**
 * General class for generating a pkcs7-mime compressed message.
 *
 * A simple example of usage.
 *
 *  *      SMIMECompressedGenerator  fact = new SMIMECompressedGenerator();
 *
 *      MimeBodyPart           smime = fact.generate(content, algorithm);
 * 
 *
 * Note: Most clients expect the MimeBodyPart to be in a MimeMultipart
 * when it's sent.
 */
public class SMIMECompressedGenerator
    extends SMIMEGenerator
{
    public static final String  ZLIB    = CMSCompressedDataGenerator.ZLIB;

    private static final String COMPRESSED_CONTENT_TYPE = "application/pkcs7-mime; name=\"smime.p7z\"; smime-type=compressed-data";

    static
    {
        CommandMap commandMap = CommandMap.getDefaultCommandMap();

        if (commandMap instanceof MailcapCommandMap)
        {
            final MailcapCommandMap mc = (MailcapCommandMap)commandMap;

            mc.addMailcap("application/pkcs7-mime;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.pkcs7_mime");
            mc.addMailcap("application/x-pkcs7-mime;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.x_pkcs7_mime");

            AccessController.doPrivileged(new PrivilegedAction()
            {
                public Object run()
                {
                    CommandMap.setDefaultCommandMap(mc);

                    return null;
                }
            });
        }
    }

    /**
     * generate an compressed object that contains an SMIME Compressed
     * object using the given compression algorithm.
     */
    private MimeBodyPart make(
        MimeBodyPart    content,
        OutputCompressor compressor)
        throws SMIMEException
    {
        try
        {  
            MimeBodyPart data = new MimeBodyPart();
        
            data.setContent(new ContentCompressor(content, compressor), COMPRESSED_CONTENT_TYPE);
            data.addHeader("Content-Type", COMPRESSED_CONTENT_TYPE);
            data.addHeader("Content-Disposition", "attachment; filename=\"smime.p7z\"");
            data.addHeader("Content-Description", "S/MIME Compressed Message");
            data.addHeader("Content-Transfer-Encoding", encoding);

            return data;
        }
        catch (MessagingException e)
        {
            throw new SMIMEException("exception putting multi-part together.", e);
        }
    }

    /**
     * generate an compressed object that contains an SMIME Compressed
     * object using the given provider from the contents of the passed in
     * message
     */
    public MimeBodyPart generate(
        MimeBodyPart    content,
        OutputCompressor compressor)
        throws SMIMEException
    {
        return make(makeContentBodyPart(content), compressor);
    }

    /**
     * generate an compressed object that contains an SMIME Compressed
     * object using the given provider from the contents of the passed in
     * message
     */
    public MimeBodyPart generate(
        MimeMessage     message,
        OutputCompressor compressor)
        throws SMIMEException
    {
        try
        {
            message.saveChanges();      // make sure we're up to date.
        }
        catch (MessagingException e)
        {
            throw new SMIMEException("unable to save message", e);
        }
                        
        return make(makeContentBodyPart(message), compressor);
    }
    
    private class ContentCompressor
        implements SMIMEStreamingProcessor
    {
        private final MimeBodyPart content;
        private final OutputCompressor compressor;
        
        ContentCompressor(
            MimeBodyPart content,
            OutputCompressor compressor)
        {
            this.content = content;
            this.compressor = compressor;
        }

        public void write(OutputStream out)
            throws IOException
        {
            CMSCompressedDataStreamGenerator cGen = new CMSCompressedDataStreamGenerator();
            
            OutputStream compressed = cGen.open(out, compressor);
            
            try
            {
                content.writeTo(compressed);
                
                compressed.close();
            }
            catch (MessagingException e)
            {
                throw new IOException(e.toString());
            }
        }
    }
}