Parsing class for an CMS Enveloped Data object from an input stream.

Example of use - assuming the first recipient matches the private key we have.

     CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(inputStream);

     RecipientInformationStore  recipients = ep.getRecipientInfos();

     Collection  c = recipients.getRecipients();
     Iterator    it = c.iterator();

     if (it.hasNext())
     {
         RecipientInformation   recipient = (RecipientInformation)it.next();

         CMSTypedStream recData = recipient.getContentStream(new JceKeyTransEnvelopedRecipient(privateKey).setProvider("BC"));

         processDataStream(recData.getContentStream());
     }
 

Note: this class does not introduce buffering - if you are processing large files you should create the parser with:

         CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(new BufferedInputStream(inputStream, bufSize));
 

where bufSize is a suitably large buffer size.