/**
* Multiplies a {@link BitcoinNet.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, given the TNAF
* of <code>λ</code>.
* @param p The AbstractF2mPoint to Multiply.
* @param u The the TNAF of <code>λ</code>..
* @return <code>λ * p</code>
*/
public static AbstractF2mPoint MultiplyFromTnaf(AbstractF2mPoint p, sbyte[] u)
{
ECCurve curve = p.Curve;
AbstractF2mPoint q = (AbstractF2mPoint)curve.Infinity;
AbstractF2mPoint pNeg = (AbstractF2mPoint)p.Negate();
int tauCount = 0;
for (int i = u.Length - 1; i >= 0; i--)
{
++tauCount;
sbyte ui = u[i];
if (ui != 0)
{
q = q.TauPow(tauCount);
tauCount = 0;
ECPoint x = ui > 0 ? p : pNeg;
q = (AbstractF2mPoint)q.Add(x);
}
}
if (tauCount > 0)
{
q = q.TauPow(tauCount);
}
return(q);
}
public static AbstractF2mPoint MultiplyFromTnaf(AbstractF2mPoint p, sbyte[] u)
{
ECCurve curve = p.Curve;
AbstractF2mPoint abstractF2mPoint = (AbstractF2mPoint)curve.Infinity;
AbstractF2mPoint abstractF2mPoint2 = (AbstractF2mPoint)p.Negate();
int num = 0;
for (int num2 = u.Length - 1; num2 >= 0; num2--)
{
num++;
sbyte b = u[num2];
if (b != 0)
{
abstractF2mPoint = abstractF2mPoint.TauPow(num);
num = 0;
ECPoint b2 = (b > 0) ? p : abstractF2mPoint2;
abstractF2mPoint = (AbstractF2mPoint)abstractF2mPoint.Add(b2);
}
}
if (num > 0)
{
abstractF2mPoint = abstractF2mPoint.TauPow(num);
}
return(abstractF2mPoint);
}
public static AbstractF2mPoint MultiplyFromTnaf(AbstractF2mPoint p, sbyte[] u)
{
AbstractF2mPoint infinity = (AbstractF2mPoint)p.Curve.Infinity;
AbstractF2mPoint point2 = (AbstractF2mPoint)p.Negate();
int pow = 0;
for (int i = u.Length - 1; i >= 0; i--)
{
pow++;
sbyte num3 = u[i];
if (num3 != 0)
{
infinity = infinity.TauPow(pow);
pow = 0;
ECPoint b = (num3 <= 0) ? point2 : p;
infinity = (AbstractF2mPoint)infinity.Add(b);
}
}
if (pow > 0)
{
infinity = infinity.TauPow(pow);
}
return(infinity);
}
/**
* Multiplies a {@link NBitcoin.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, given the TNAF
* of <code>λ</code>.
* @param p The AbstractF2mPoint to Multiply.
* @param u The the TNAF of <code>λ</code>..
* @return <code>λ * p</code>
*/
public static AbstractF2mPoint MultiplyFromTnaf(AbstractF2mPoint p, sbyte[] u)
{
ECCurve curve = p.Curve;
AbstractF2mPoint q = (AbstractF2mPoint)curve.Infinity;
AbstractF2mPoint pNeg = (AbstractF2mPoint)p.Negate();
int tauCount = 0;
for(int i = u.Length - 1; i >= 0; i--)
{
++tauCount;
sbyte ui = u[i];
if(ui != 0)
{
q = q.TauPow(tauCount);
tauCount = 0;
ECPoint x = ui > 0 ? p : pNeg;
q = (AbstractF2mPoint)q.Add(x);
}
}
if(tauCount > 0)
{
q = q.TauPow(tauCount);
}
return q;
}
