Package org.bouncycastle.cms

Class CMSAuthenticatedDataParser

java.lang.Object
org.bouncycastle.cms.CMSContentInfoParser
org.bouncycastle.cms.CMSAuthenticatedDataParser
public class CMSAuthenticatedDataParser extends CMSContentInfoParser
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.

  • Constructor Details

  • Method Details

    • getOriginatorInfo

      public OriginatorInformation getOriginatorInfo()
      Return the originator information associated with this message if present.
      Returns:
      OriginatorInformation, null if not present.

    • getMacAlgorithm

      public org.bouncycastle.asn1.x509.AlgorithmIdentifier getMacAlgorithm()
      Return the MAC algorithm details for the MAC associated with the data in this object.
      Returns:
      AlgorithmIdentifier representing the MAC algorithm.

    • getMacAlgOID

      public String getMacAlgOID()
      return the object identifier for the mac algorithm.

    • getMacAlgParams

      public byte[] getMacAlgParams()
      return the ASN.1 encoded encryption algorithm parameters, or null if there aren't any.

    • getRecipientInfos

      public RecipientInformationStore getRecipientInfos()
      return a store of the intended recipients for this message

    • getMac

      public byte[] getMac() throws IOException
      Throws:
      IOException

    • getAuthAttrs

      public org.bouncycastle.asn1.cms.AttributeTable getAuthAttrs() throws IOException
      return a table of the unauthenticated attributes indexed by the OID of the attribute.
      Throws:
      IOException

    • getUnauthAttrs

      public org.bouncycastle.asn1.cms.AttributeTable getUnauthAttrs() throws IOException
      return a table of the unauthenticated attributes indexed by the OID of the attribute.
      Throws:
      IOException

    • getContentDigest

      public byte[] getContentDigest()
      This will only be valid after the content has been read.
      Returns:
      the contents of the messageDigest attribute, if available. Null if not present.