Package org.bouncycastle.cms

Class 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 Detail

      • CMSAuthenticatedDataParser

        public CMSAuthenticatedDataParser​(byte[] envelopedData)
                           throws CMSException,
                                  java.io.IOException
        Throws:
        CMSException
        java.io.IOException

      • CMSAuthenticatedDataParser

        public CMSAuthenticatedDataParser​(java.io.InputStream envelopedData)
                           throws CMSException,
                                  java.io.IOException
        Throws:
        CMSException
        java.io.IOException

    • Method Detail

      • 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 java.lang.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 java.io.IOException
        Throws:
        java.io.IOException

      • getAuthAttrs

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

      • getUnauthAttrs

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