Java Doc for DataProtectionService.java in  » Science » Cougaar12_4 » org » cougaar » core » service » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.core.service 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.cougaar.core.service.DataProtectionService

All known Subclasses:   org.cougaar.core.persist.DataProtectionServiceStub,
DataProtectionService
public interface DataProtectionService extends Service(Code)
This service is used by persistence to sign/encrypt an OutputStream and verify/decrypt an InputStream .




Method Summary
 InputStreamgetInputStream(DataProtectionKeyEnvelope pke, InputStream is)
     Unprotects a data stream by verifying and/or decrypting the stream.
 OutputStreamgetOutputStream(DataProtectionKeyEnvelope pke, OutputStream os)
     Protects a data stream by signing and/or encrypting the stream. The service client should create an output stream to which the encrypted and/or signed data should be persisted.

This service will return an OutputStream that the client should use to write the unprotected data.




Method Detail
getInputStream
InputStream getInputStream(DataProtectionKeyEnvelope pke, InputStream is) throws IOException(Code)
Unprotects a data stream by verifying and/or decrypting the stream.

The client should provide a key envelope having the same key that was used to encrypt the data.
Parameters:
  pke - provides a place to retrieve the key for decrypting the stream
Parameters:
  is - the input stream containing the encrypted and/or signed data An input stream containing the un-encrypted and/or verified data.




getOutputStream
OutputStream getOutputStream(DataProtectionKeyEnvelope pke, OutputStream os) throws IOException(Code)
Protects a data stream by signing and/or encrypting the stream. The service client should create an output stream to which the encrypted and/or signed data should be persisted.

This service will return an OutputStream that the client should use to write the unprotected data. The encrypted key that must be used to decrypt the stream will be placed in the key envelope. The client is responsible for retaining the encrypted key and providing it when the stream is subsequently decrypted. The encrypted key is usually a symmetric key encrypted with the public key of the agent.

This service must be able to re-encrypt symmetric keys at any time. For instance, keys may be re-encrypted if the certificate containing the public key is about to expire, or if the certificate is revoked.

In order to get access to keys at any time, the client must implement the DataProtectionServiceClient interface, which provides an iterator over all the key envelopes into which keys have been placed. The client is responsible for storing the envelope, so that it is available in the Iterator.
Parameters:
  pke - provides a place to store the key used to encrypt the stream
Parameters:
  os - the output stream containing the encrypted and/or signed data An output stream that the client uses to protect data.




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