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

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

     CMSAuthenticatedDataParser     ad = new CMSAuthenticatedDataParser(inputStream);

     RecipientInformationStore  recipients = ad.getRecipientInfos();

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

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

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

         processDataStream(recData.getContentStream());

         if (!Arrays.equals(ad.getMac(), recipient.getMac())
         {
             System.err.println("Data corrupted!!!!");
         }
     }
 

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

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

where bufSize is a suitably large buffer size.