CMSAuthenticatedDataParser

Class Overview

Parsing class for an CMS Authenticated 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.

      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.

Summary

[Expand] Inherited Fields
From class org.bouncycastle.cms.CMSContentInfoParser protected ContentInfoParser _contentInfo protected InputStream _data

Public Constructors
	CMSAuthenticatedDataParser(byte[] envelopedData)
	CMSAuthenticatedDataParser(byte[] envelopedData, DigestCalculatorProvider digestCalculatorProvider)
	CMSAuthenticatedDataParser(InputStream envelopedData)
	CMSAuthenticatedDataParser(InputStream envelopedData, DigestCalculatorProvider digestCalculatorProvider)

Public Methods
AttributeTable	getAuthAttrs() return a table of the unauthenticated attributes indexed by the OID of the attribute.
byte[]	getContentDigest() This will only be valid after the content has been read.
byte[]	getMac()
String	getMacAlgOID() return the object identifier for the mac algorithm.
byte[]	getMacAlgParams() return the ASN.1 encoded encryption algorithm parameters, or null if there aren't any.
AlgorithmParameters	getMacAlgorithmParameters(String provider) Return an AlgorithmParameters object giving the encryption parameters used to encrypt the message content.
AlgorithmParameters	getMacAlgorithmParameters(Provider provider) Return an AlgorithmParameters object giving the encryption parameters used to encrypt the message content.
RecipientInformationStore	getRecipientInfos() return a store of the intended recipients for this message
AttributeTable	getUnauthAttrs() return a table of the unauthenticated attributes indexed by the OID of the attribute.

[Expand] Inherited Methods
From class org.bouncycastle.cms.CMSContentInfoParser void close() Close the underlying data stream.
From class java.lang.Object Object clone() boolean equals(Object arg0) void finalize() final Class<?> getClass() int hashCode() final void notify() final void notifyAll() String toString() final void wait() final void wait(long arg0, int arg1) final void wait(long arg0)