gnu.cajo.utils.extra

Class HashedProxy

java.lang.Object

gnu.cajo.utils.ZippedProxy

gnu.cajo.utils.extra.HashedProxy

All Implemented Interfaces:

Invoke, Serializable

public class HashedProxy
extends ZippedProxy

This class is used to hash a ZippedProxy. Primarily it is intended to simply and quickly convert the serialized proxy representation in to, and out of plaintext, for transmission over the network. It should be noted that the default hashing algorithm is not cryptographically strong. (The author lives in the United States and doesn't want to go to jail) It's purpose is to provide a simple example encryption, which could be sufficient for many purposes. It can always be subclassed, to employ much more sophisticated cryptography. ;-)

The underlying paradigm is that rather than incurring the extensive computational overhead of running encrypted streams between clients and servers, it much more efficient to encrypt only those specific objects containing sensitive information. It is even stronger than conventional encrypted streams in that each object can employ different cryptography. If the client and the server both have the derived class in their local codebases; it is possible to employ 'pad' (i.e. uncrackable) cyphers.

Version:

1.0, 01-Nov-99 Initial release

Author:

John Catherino

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	hashed A flag to indicate if the payload has been hashed.

Fields inherited from class gnu.cajo.utils.ZippedProxy

payload, proxy

Constructor Summary

Constructors

Constructor and Description
HashedProxy(Object proxy) The constructor simply invokes the superclass ZippedProxy constructor.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	hashPayload() A symetric hash algorithm, to convolve the array in to and out of plain text.

Methods inherited from class gnu.cajo.utils.ZippedProxy

invoke

Methods inherited from class java.lang.Object

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

Field Detail

hashed

protected transient boolean hashed

A flag to indicate if the payload has been hashed. To reduce overhead, the payload is hashed only once per session.

Constructor Detail

HashedProxy

public HashedProxy(Object proxy)

The constructor simply invokes the superclass ZippedProxy constructor.

Parameters:

proxy - The client proxy object, to be hashed at the server, and unhashed at the client.

Method Detail

hashPayload

protected void hashPayload()

A symetric hash algorithm, to convolve the array in to and out of plain text. It is invoked once at the sending VM, then once at the receiving VM.