| 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.
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