private Point SimpleMultiply(Point p, BigInt k)
{
if (!(this.field.IsValidElement(p.X)) || !(this.field.IsValidElement(p.Y))
)
{
throw new ArgumentException("The input point must be taken over the field.");
}
if (p.IsInfinity())
{
return(p);
}
if (k.Equals(BigInt.ZERO))
{
return(Point.INFINITY);
}
if (k.Equals(BigInt.ONE))
{
return(p);
}
if (k.Signum() == -1)
{
k = k.Abs();
p = this.Negate(p);
}
sbyte[] ba = k.ToByteArray();
int degree = ByteArrayUtil.DegreeOf(ba) - 1;
Point x = p;
for (int i = degree; i >= 0; i--)
{
x = this.Dbl(x);
if (ByteArrayUtil.GetBitByDegree(i, ba))
{
x = this.Add(p, x);
}
}
return(x);
}