Class CMSEnvelopedDataParser

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

Note: that because we are in a streaming mode only one recipient can be tried and it is important that the methods on the parser are called in the appropriate order.

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(privateKey, "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.