BestHTTP.SecureProtocol.Org.BouncyCastle.Math.EC.Custom.Sec.SecT163R2Point.Twice C# (CSharp) Метод

        public override ECPoint Twice()
        {
            if (this.IsInfinity)
            {
                return this;
            }

            ECCurve curve = this.Curve;

            ECFieldElement X1 = this.RawXCoord;
            if (X1.IsZero)
            {
                // A point with X == 0 is it's own Additive inverse
                return curve.Infinity;
            }

            ECFieldElement L1 = this.RawYCoord, Z1 = this.RawZCoords[0];

            bool Z1IsOne = Z1.IsOne;
            ECFieldElement L1Z1 = Z1IsOne ? L1 : L1.Multiply(Z1);
            ECFieldElement Z1Sq = Z1IsOne ? Z1 : Z1.Square();
            ECFieldElement T = L1.Square().Add(L1Z1).Add(Z1Sq);
            if (T.IsZero)
            {
                return new SecT163R2Point(curve, T, curve.B.Sqrt(), IsCompressed);
            }

            ECFieldElement X3 = T.Square();
            ECFieldElement Z3 = Z1IsOne ? T : T.Multiply(Z1Sq);

            ECFieldElement X1Z1 = Z1IsOne ? X1 : X1.Multiply(Z1);
            ECFieldElement L3 = X1Z1.SquarePlusProduct(T, L1Z1).Add(X3).Add(Z3);

            return new SecT163R2Point(curve, X3, L3, new ECFieldElement[] { Z3 }, IsCompressed);
        }