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## org.bouncycastle.crypto.ec
Class ECFixedTransform

    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
`ECFixedTransform(java.math.BigInteger k)`

Method Summary
`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()

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