org.bouncycastle.crypto.ec
Class ECNewRandomnessTransform

java.lang.Object
  |
  +--org.bouncycastle.crypto.ec.ECNewRandomnessTransform

All Implemented Interfaces:

ECPairFactorTransform, ECPairTransform

public class ECNewRandomnessTransform

extends java.lang.Object

implements ECPairFactorTransform

this transforms the original randomness used for an ElGamal encryption.

Constructor Summary

ECNewRandomnessTransform()

Method Summary

protected org.bouncycastle.math.ec.ECMultiplier	createBasePointMultiplier()
java.math.BigInteger	getTransformValue() Return the last random value generated for a transform
void	init(CipherParameters param) initialise the underlying EC ElGamal engine.
ECPair	transform(ECPair cipherText) Transform an existing cipher test pair using the ElGamal algorithm.

Methods inherited from class java.lang.Object

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

Constructor Detail

ECNewRandomnessTransform

public ECNewRandomnessTransform()

Method Detail

init

public void init(CipherParameters param)

initialise the underlying EC ElGamal engine.

Specified by:

init in interface ECPairTransform

Parameters:

param - the necessary EC key parameters.

transform

public ECPair transform(ECPair cipherText)

Transform an existing cipher test pair using the ElGamal algorithm. Note: it is assumed this transform has been initialised with the same public key that was used to create the original cipher text.

Specified by:

transform in interface ECPairTransform

Parameters:

cipherText - the EC point to process.

Returns:

returns a new ECPair representing the result of the process.

getTransformValue

public java.math.BigInteger getTransformValue()

Return the last random value generated for a transform

Specified by:

getTransformValue in interface ECPairFactorTransform

Returns:

a BigInteger representing the last random value.

createBasePointMultiplier

protected org.bouncycastle.math.ec.ECMultiplier createBasePointMultiplier()