org.spongycastle.cms

Class CMSEnvelopedDataParser

java.lang.Object

org.spongycastle.cms.CMSContentInfoParser

org.spongycastle.cms.CMSEnvelopedDataParser

public class CMSEnvelopedDataParser
extends CMSContentInfoParser

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(new JceKeyTransEnvelopedRecipient(privateKey).setProvider("SC"));
          
          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.

Field Summary

Fields inherited from class org.spongycastle.cms.CMSContentInfoParser

_contentInfo, _data

Constructor Summary

Constructors

Constructor and Description
CMSEnvelopedDataParser(byte[] envelopedData)
CMSEnvelopedDataParser(java.io.InputStream envelopedData)

Method Summary

Modifier and Type	Method and Description
org.spongycastle.asn1.x509.AlgorithmIdentifier	getContentEncryptionAlgorithm() Return the content encryption algorithm details for the data in this object.
java.lang.String	getEncryptionAlgOID() return the object identifier for the content encryption algorithm.
byte[]	getEncryptionAlgParams() return the ASN.1 encoded encryption algorithm parameters, or null if there aren't any.
OriginatorInformation	getOriginatorInfo() Return the originator information associated with this message if present.
RecipientInformationStore	getRecipientInfos() return a store of the intended recipients for this message
org.spongycastle.asn1.cms.AttributeTable	getUnprotectedAttributes() return a table of the unprotected attributes indexed by the OID of the attribute.

Methods inherited from class org.spongycastle.cms.CMSContentInfoParser

close

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CMSEnvelopedDataParser

public CMSEnvelopedDataParser(byte[] envelopedData)
                       throws CMSException,
                              java.io.IOException

Throws:

CMSException

java.io.IOException

CMSEnvelopedDataParser

public CMSEnvelopedDataParser(java.io.InputStream envelopedData)
                       throws CMSException,
                              java.io.IOException

Throws:

CMSException

java.io.IOException

Method Detail

getEncryptionAlgOID

public java.lang.String getEncryptionAlgOID()

return the object identifier for the content encryption algorithm.

getEncryptionAlgParams

public byte[] getEncryptionAlgParams()

return the ASN.1 encoded encryption algorithm parameters, or null if there aren't any.

getContentEncryptionAlgorithm

public org.spongycastle.asn1.x509.AlgorithmIdentifier getContentEncryptionAlgorithm()

Return the content encryption algorithm details for the data in this object.

Returns:

AlgorithmIdentifier representing the content encryption algorithm.

getOriginatorInfo

public OriginatorInformation getOriginatorInfo()

Return the originator information associated with this message if present.

Returns:

OriginatorInformation, null if not present.

getRecipientInfos

public RecipientInformationStore getRecipientInfos()

return a store of the intended recipients for this message

getUnprotectedAttributes

public org.spongycastle.asn1.cms.AttributeTable getUnprotectedAttributes()
                                                                  throws java.io.IOException

return a table of the unprotected attributes indexed by the OID of the attribute.

Throws:

java.io.IOException