/**
* Multiplies a {@link org.bouncycastle.math.ec.AbstractF2mPoint AbstractF2mPoint}
* by an element <code>λ</code> of <code><b>Z</b>[τ]</code> using
* the <code>τ</code>-adic NAF (TNAF) method.
* @param p The AbstractF2mPoint to multiply.
* @param lambda The element <code>λ</code> of
* <code><b>Z</b>[τ]</code> of which to compute the
* <code>[τ]</code>-adic NAF.
* @return <code>p</code> multiplied by <code>λ</code>.
*/
private AbstractF2mPoint MultiplyWTnaf(AbstractF2mPoint p, ZTauElement lambda,
PreCompInfo preCompInfo, sbyte a, sbyte mu)
{
ZTauElement[] alpha = (a == 0) ? Tnaf.Alpha0 : Tnaf.Alpha1;
BigInteger tw = Tnaf.GetTw(mu, Tnaf.Width);
sbyte[] u = Tnaf.TauAdicWNaf(mu, lambda, Tnaf.Width,
BigInteger.ValueOf(Tnaf.Pow2Width), tw, alpha);
return(MultiplyFromWTnaf(p, u, preCompInfo));
}
/**
* Multiplies a {@link Al.Security.math.ec.F2mPoint F2mPoint}
* by an element <code>λ</code> of <code><b>Z</b>[τ]</code> using
* the <code>τ</code>-adic NAF (TNAF) method.
* @param p The F2mPoint to multiply.
* @param lambda The element <code>λ</code> of
* <code><b>Z</b>[τ]</code> of which to compute the
* <code>[τ]</code>-adic NAF.
* @return <code>p</code> multiplied by <code>λ</code>.
*/
private F2mPoint MultiplyWTnaf(F2mPoint p, ZTauElement lambda,
PreCompInfo preCompInfo, sbyte a, sbyte mu)
{
ZTauElement[] alpha;
if (a == 0)
{
alpha = Tnaf.Alpha0;
}
else
{
// a == 1
alpha = Tnaf.Alpha1;
}
BigInteger tw = Tnaf.GetTw(mu, Tnaf.Width);
sbyte[] u = Tnaf.TauAdicWNaf(mu, lambda, Tnaf.Width,
BigInteger.ValueOf(Tnaf.Pow2Width), tw, alpha);
return(MultiplyFromWTnaf(p, u, preCompInfo));
}