gnu.crypto.assembly
Class ModeStage

java.lang.Object
  gnu.crypto.assembly.Stage
      gnu.crypto.assembly.ModeStage

class ModeStage

extends Stage

An IMode Stage in a Cascade Cipher chain.

Such a stage wraps an implementation of a Block Cipher Mode of Operation (IMode) to allow inclusion of such an instance in a cascade of block ciphers.

Version:

$Revision: 1.2 $

Field Summary

Fields inherited from class gnu.crypto.assembly.Stage

DIRECTION, forward, wired

Constructor Summary

(package private)

ModeStage(IMode mode, Direction forwardDirection)

Method Summary

java.util.Set	blockSizes() Returns the Set of supported block sizes for this Stage.
int	currentBlockSize() Returns the currently set block size for the stage.
(package private) void	initDelegate(java.util.Map attributes)
(package private) void	resetDelegate()
boolean	selfTest() Conducts a simple correctness test that consists of basic symmetric encryption / decryption test(s) for all supported block and key sizes of underlying block cipher(s) wrapped by Mode leafs.
(package private) void	updateDelegate(byte[] in, int inOffset, byte[] out, int outOffset)

Methods inherited from class gnu.crypto.assembly.Stage

getInstance, getInstance, init, reset, update

Methods inherited from class java.lang.Object

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

Constructor Detail

ModeStage

ModeStage(IMode mode,
          Direction forwardDirection)

Method Detail

blockSizes

public java.util.Set blockSizes()

Description copied from class: Stage

Returns the Set of supported block sizes for this Stage. Each element in the returned Set is an instance of Integer.

Specified by:

blockSizes in class Stage

Returns:

a Set of supported block sizes.

initDelegate

void initDelegate(java.util.Map attributes)
            throws java.security.InvalidKeyException

Specified by:

initDelegate in class Stage

Throws:

java.security.InvalidKeyException

currentBlockSize

public int currentBlockSize()
                     throws java.lang.IllegalStateException

Description copied from class: Stage

Returns the currently set block size for the stage.

Specified by:

currentBlockSize in class Stage

Returns:

the current block size for this stage.

Throws:

java.lang.IllegalStateException - if the instance is not initialised.

resetDelegate

void resetDelegate()

Specified by:

resetDelegate in class Stage

updateDelegate

void updateDelegate(byte[] in,
                    int inOffset,
                    byte[] out,
                    int outOffset)

Specified by:

updateDelegate in class Stage

selfTest

public boolean selfTest()

Description copied from class: Stage

Conducts a simple correctness test that consists of basic symmetric encryption / decryption test(s) for all supported block and key sizes of underlying block cipher(s) wrapped by Mode leafs. The test also includes one (1) variable key Known Answer Test (KAT) for each block cipher.

Specified by:

selfTest in class Stage

Returns:

true if the implementation passes simple correctness tests. Returns false otherwise.