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The Bouncy Castle Java APIs for doing S/MIME with the Jakarta Mail APIs. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.mail.smime;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;

import jakarta.mail.MessagingException;
import jakarta.mail.Part;
import jakarta.mail.internet.MimeBodyPart;
import jakarta.mail.internet.MimeMessage;
import jakarta.mail.internet.MimePart;

import org.bouncycastle.cms.CMSCompressedDataParser;
import org.bouncycastle.cms.CMSException;

/**
 * Stream based containing class for an S/MIME pkcs7-mime compressed MimePart.
 */
public class SMIMECompressedParser
    extends CMSCompressedDataParser
{
    private final MimePart message;

    private static InputStream getInputStream(
        Part    bodyPart,
        int     bufferSize)
        throws MessagingException
    {
        try
        {
            InputStream in = bodyPart.getInputStream();
            
            if (bufferSize == 0)
            {
                return new BufferedInputStream(in);
            }
            else
            {
                return new BufferedInputStream(in, bufferSize);
            }
        }
        catch (IOException e)
        {
            throw new MessagingException("can't extract input stream: " + e);
        }
    }

    public SMIMECompressedParser(
        MimeBodyPart    message) 
        throws MessagingException, CMSException
    {
        this(message, 0);
    }

    public SMIMECompressedParser(
        MimeMessage    message) 
        throws MessagingException, CMSException
    {
        this(message, 0);
    }
    
    /**
     * Create a parser from a MimeBodyPart using the passed in buffer size
     * for reading it.
     * 
     * @param message body part to be parsed.
     * @param bufferSize bufferSoze to be used.
     */
    public SMIMECompressedParser(
        MimeBodyPart    message,
        int             bufferSize) 
        throws MessagingException, CMSException
    {
        super(getInputStream(message, bufferSize));

        this.message = message;
    }

    /**
     * Create a parser from a MimeMessage using the passed in buffer size
     * for reading it.
     * 
     * @param message message to be parsed.
     * @param bufferSize bufferSoze to be used.
     */
    public SMIMECompressedParser(
        MimeMessage    message,
        int            bufferSize) 
        throws MessagingException, CMSException
    {
        super(getInputStream(message, bufferSize));

        this.message = message;
    }

    public MimePart getCompressedContent()
    {
        return message;
    }
}