org.bouncycastle.math.ec.WNafPreCompInfo Maven / Gradle / Ivy
package org.bouncycastle.math.ec;
/**
* Class holding precomputation data for the WNAF (Window Non-Adjacent Form)
* algorithm.
*/
public class WNafPreCompInfo implements PreCompInfo
{
volatile int promotionCountdown = 4;
protected int confWidth = -1;
/**
* Array holding the precomputed ECPoints used for a Window
* NAF multiplication.
*/
protected ECPoint[] preComp = null;
/**
* Array holding the negations of the precomputed ECPoints used
* for a Window NAF multiplication.
*/
protected ECPoint[] preCompNeg = null;
/**
* Holds an ECPoint representing twice(this). Used for the
* Window NAF multiplication to create or extend the precomputed values.
*/
protected ECPoint twice = null;
protected int width = -1;
int decrementPromotionCountdown()
{
int t = promotionCountdown;
if (t > 0)
{
promotionCountdown = --t;
}
return t;
}
int getPromotionCountdown()
{
return promotionCountdown;
}
void setPromotionCountdown(int promotionCountdown)
{
this.promotionCountdown = promotionCountdown;
}
public boolean isPromoted()
{
return promotionCountdown <= 0;
}
public int getConfWidth()
{
return confWidth;
}
public void setConfWidth(int confWidth)
{
this.confWidth = confWidth;
}
public ECPoint[] getPreComp()
{
return preComp;
}
public void setPreComp(ECPoint[] preComp)
{
this.preComp = preComp;
}
public ECPoint[] getPreCompNeg()
{
return preCompNeg;
}
public void setPreCompNeg(ECPoint[] preCompNeg)
{
this.preCompNeg = preCompNeg;
}
public ECPoint getTwice()
{
return twice;
}
public void setTwice(ECPoint twice)
{
this.twice = twice;
}
public int getWidth()
{
return width;
}
public void setWidth(int width)
{
this.width = width;
}
}