protected virtual ECFieldElement GetDenominator(int coordinateSystem, ECPoint p)
{
switch(coordinateSystem)
{
case ECCurve.COORD_HOMOGENEOUS:
case ECCurve.COORD_LAMBDA_PROJECTIVE:
case ECCurve.COORD_SKEWED:
return p.GetZCoord(0);
case ECCurve.COORD_JACOBIAN:
case ECCurve.COORD_JACOBIAN_CHUDNOVSKY:
case ECCurve.COORD_JACOBIAN_MODIFIED:
return p.GetZCoord(0).Square();
default:
return null;
}
}
public override ECPoint ImportPoint(ECPoint p)
{
if (this != p.Curve && this.CoordinateSystem == COORD_JACOBIAN && !p.IsInfinity)
{
switch (p.Curve.CoordinateSystem)
{
case COORD_JACOBIAN:
case COORD_JACOBIAN_CHUDNOVSKY:
case COORD_JACOBIAN_MODIFIED:
return new FpPoint(this,
FromBigInteger(p.RawXCoord.ToBigInteger()),
FromBigInteger(p.RawYCoord.ToBigInteger()),
new ECFieldElement[] { FromBigInteger(p.GetZCoord(0).ToBigInteger()) },
p.IsCompressed);
default:
break;
}
}
return base.ImportPoint(p);
}
