public override ECPoint Add(ECPoint b)
    {
        if (base.IsInfinity)
        {
            return(b);
        }
        if (b.IsInfinity)
        {
            return(this);
        }
        if (this == b)
        {
            return(Twice());
        }
        ECCurve curve = Curve;
        SecP224K1FieldElement secP224K1FieldElement  = (SecP224K1FieldElement)base.RawXCoord;
        SecP224K1FieldElement secP224K1FieldElement2 = (SecP224K1FieldElement)base.RawYCoord;
        SecP224K1FieldElement secP224K1FieldElement3 = (SecP224K1FieldElement)b.RawXCoord;
        SecP224K1FieldElement secP224K1FieldElement4 = (SecP224K1FieldElement)b.RawYCoord;
        SecP224K1FieldElement secP224K1FieldElement5 = (SecP224K1FieldElement)base.RawZCoords[0];
        SecP224K1FieldElement secP224K1FieldElement6 = (SecP224K1FieldElement)b.RawZCoords[0];

        uint[] array  = Nat224.CreateExt();
        uint[] array2 = Nat224.Create();
        uint[] array3 = Nat224.Create();
        uint[] array4 = Nat224.Create();
        bool   isOne  = secP224K1FieldElement5.IsOne;

        uint[] array5;
        uint[] array6;
        if (isOne)
        {
            array5 = secP224K1FieldElement3.x;
            array6 = secP224K1FieldElement4.x;
        }
        else
        {
            array6 = array3;
            SecP224K1Field.Square(secP224K1FieldElement5.x, array6);
            array5 = array2;
            SecP224K1Field.Multiply(array6, secP224K1FieldElement3.x, array5);
            SecP224K1Field.Multiply(array6, secP224K1FieldElement5.x, array6);
            SecP224K1Field.Multiply(array6, secP224K1FieldElement4.x, array6);
        }
        bool isOne2 = secP224K1FieldElement6.IsOne;

        uint[] array7;
        uint[] array8;
        if (isOne2)
        {
            array7 = secP224K1FieldElement.x;
            array8 = secP224K1FieldElement2.x;
        }
        else
        {
            array8 = array4;
            SecP224K1Field.Square(secP224K1FieldElement6.x, array8);
            array7 = array;
            SecP224K1Field.Multiply(array8, secP224K1FieldElement.x, array7);
            SecP224K1Field.Multiply(array8, secP224K1FieldElement6.x, array8);
            SecP224K1Field.Multiply(array8, secP224K1FieldElement2.x, array8);
        }
        uint[] array9 = Nat224.Create();
        SecP224K1Field.Subtract(array7, array5, array9);
        uint[] array10 = array2;
        SecP224K1Field.Subtract(array8, array6, array10);
        if (Nat224.IsZero(array9))
        {
            if (Nat224.IsZero(array10))
            {
                return(Twice());
            }
            return(curve.Infinity);
        }
        uint[] array11 = array3;
        SecP224K1Field.Square(array9, array11);
        uint[] array12 = Nat224.Create();
        SecP224K1Field.Multiply(array11, array9, array12);
        uint[] array13 = array3;
        SecP224K1Field.Multiply(array11, array7, array13);
        SecP224K1Field.Negate(array12, array12);
        Nat224.Mul(array8, array12, array);
        uint x = Nat224.AddBothTo(array13, array13, array12);

        SecP224K1Field.Reduce32(x, array12);
        SecP224K1FieldElement secP224K1FieldElement7 = new SecP224K1FieldElement(array4);

        SecP224K1Field.Square(array10, secP224K1FieldElement7.x);
        SecP224K1Field.Subtract(secP224K1FieldElement7.x, array12, secP224K1FieldElement7.x);
        SecP224K1FieldElement secP224K1FieldElement8 = new SecP224K1FieldElement(array12);

        SecP224K1Field.Subtract(array13, secP224K1FieldElement7.x, secP224K1FieldElement8.x);
        SecP224K1Field.MultiplyAddToExt(secP224K1FieldElement8.x, array10, array);
        SecP224K1Field.Reduce(array, secP224K1FieldElement8.x);
        SecP224K1FieldElement secP224K1FieldElement9 = new SecP224K1FieldElement(array9);

        if (!isOne)
        {
            SecP224K1Field.Multiply(secP224K1FieldElement9.x, secP224K1FieldElement5.x, secP224K1FieldElement9.x);
        }
        if (!isOne2)
        {
            SecP224K1Field.Multiply(secP224K1FieldElement9.x, secP224K1FieldElement6.x, secP224K1FieldElement9.x);
        }
        ECFieldElement[] zs = new ECFieldElement[1]
        {
            secP224K1FieldElement9
        };
        return(new SecP224K1Point(curve, secP224K1FieldElement7, secP224K1FieldElement8, zs, base.IsCompressed));
    }
Пример #2
0
 public override ECFieldElement Negate()
 {
     uint[] z = Nat224.Create();
     SecP224K1Field.Negate(x, z);
     return(new SecP224K1FieldElement(z));
 }