org.bouncycastle.math.ec
Class WNafL2RMultiplier

java.lang.Object
  org.bouncycastle.math.ec.AbstractECMultiplier
      org.bouncycastle.math.ec.WNafL2RMultiplier

All Implemented Interfaces:

ECMultiplier

public class WNafL2RMultiplier
extends AbstractECMultiplier

Class implementing the WNAF (Window Non-Adjacent Form) multiplication algorithm.

Constructor Summary

WNafL2RMultiplier()

Method Summary

protected int	getWindowSize(int bits) Determine window width to use for a scalar multiplication of the given size.
protected ECPoint	multiplyPositive(ECPoint p, java.math.BigInteger k) Multiplies this by an integer k using the Window NAF method.

Methods inherited from class org.bouncycastle.math.ec.AbstractECMultiplier

multiply

Methods inherited from class java.lang.Object

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

Constructor Detail

WNafL2RMultiplier

public WNafL2RMultiplier()

Method Detail

multiplyPositive

protected ECPoint multiplyPositive(ECPoint p,
                                   java.math.BigInteger k)

Multiplies this by an integer k using the Window NAF method.

Specified by:

multiplyPositive in class AbstractECMultiplier

Parameters:

k - The integer by which this is multiplied.

Returns:

A new ECPoint which equals this multiplied by k.

getWindowSize

protected int getWindowSize(int bits)

Determine window width to use for a scalar multiplication of the given size.

Parameters:

bits - the bit-length of the scalar to multiply by

Returns:

the window size to use