ECFixedTransform (Bouncy Castle Library 1.68 API Specification)

java.lang.Object
- org.bouncycastle.crypto.ec.ECFixedTransform

All Implemented Interfaces:

ECPairFactorTransform, ECPairTransform
```
public class ECFixedTransform
extends java.lang.Object
implements ECPairFactorTransform
```
this transforms the original randomness used for an ElGamal encryption by a fixed value.

Constructor Summary

Constructors
Constructor Description

ECFixedTransform(java.math.BigInteger k)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected ECMultiplier`	`createBasePointMultiplier()`
`java.math.BigInteger`	`getTransformValue()`	Return the last transform value used by the transform
`void`	`init(CipherParameters param)`	initialise the underlying EC ElGamal engine.
`ECPair`	`transform(ECPair cipherText)`	Transform an existing cipher text 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
  - ECFixedTransform
```
public ECFixedTransform(java.math.BigInteger k)
```
- 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 text 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 transform value used by the transform
    
    Specified by:
    
    getTransformValue in interface ECPairFactorTransform
    
    Returns:
    
    a BigInteger representing k value.
  - createBasePointMultiplier
```
protected ECMultiplier createBasePointMultiplier()
```