|
public abstract Divide ( |
||
| b | ||
| return | ||
public override ECPoint CreatePoint(BigInteger x, BigInteger y, bool withCompression)
{
ECFieldElement X = FromBigInteger(x), Y = FromBigInteger(y);
switch (this.CoordinateSystem)
{
case COORD_LAMBDA_AFFINE:
case COORD_LAMBDA_PROJECTIVE:
{
if (X.IsZero)
{
if (!Y.Square().Equals(B))
{
throw new ArgumentException();
}
}
else
{
// Y becomes Lambda (X + Y/X) here
Y = Y.Divide(X).Add(X);
}
break;
}
default:
{
break;
}
}
return(CreateRawPoint(X, Y, withCompression));
}
public override ECPoint CreatePoint(BigInteger x, BigInteger y, bool withCompression)
{
//IL_0044: Unknown result type (might be due to invalid IL or missing references)
ECFieldElement eCFieldElement = FromBigInteger(x);
ECFieldElement eCFieldElement2 = FromBigInteger(y);
switch (CoordinateSystem)
{
case 5:
case 6:
if (eCFieldElement.IsZero)
{
if (!eCFieldElement2.Square().Equals(B))
{
throw new ArgumentException();
}
}
else
{
eCFieldElement2 = eCFieldElement2.Divide(eCFieldElement).Add(eCFieldElement);
}
break;
}
return(CreateRawPoint(eCFieldElement, eCFieldElement2, withCompression));
}
public override ECPoint CreatePoint(BigInteger x, BigInteger y, bool withCompression)
{
ECFieldElement eCFieldElement = FromBigInteger(x);
ECFieldElement eCFieldElement2 = FromBigInteger(y);
int coordinateSystem = CoordinateSystem;
if (coordinateSystem == 5 || coordinateSystem == 6)
{
if (eCFieldElement.IsZero)
{
if (!eCFieldElement2.Square().Equals(B))
{
throw new ArgumentException();
}
}
else
{
eCFieldElement2 = eCFieldElement2.Divide(eCFieldElement).Add(eCFieldElement);
}
}
return(CreateRawPoint(eCFieldElement, eCFieldElement2, withCompression));
}
public override ECPoint CreatePoint(BigInteger x, BigInteger y, bool withCompression)
{
ECFieldElement b = this.FromBigInteger(x);
ECFieldElement element2 = this.FromBigInteger(y);
switch (this.CoordinateSystem)
{
case 5:
case 6:
if (b.IsZero)
{
if (!element2.Square().Equals(this.B))
{
throw new ArgumentException();
}
}
else
{
element2 = element2.Divide(b).Add(b);
}
break;
}
return(this.CreateRawPoint(b, element2, withCompression));
}
public override ECPoint Add(ECPoint b)
{
if (base.IsInfinity)
{
return(b);
}
if (!b.IsInfinity)
{
ECCurve curve = Curve;
int coordinateSystem = curve.CoordinateSystem;
ECFieldElement rawXCoord = base.RawXCoord;
ECFieldElement rawXCoord2 = b.RawXCoord;
switch (coordinateSystem)
{
case 0:
{
ECFieldElement rawYCoord5 = base.RawYCoord;
ECFieldElement rawYCoord6 = b.RawYCoord;
ECFieldElement eCFieldElement29 = rawXCoord.Add(rawXCoord2);
ECFieldElement eCFieldElement30 = rawYCoord5.Add(rawYCoord6);
if (eCFieldElement29.IsZero)
{
if (eCFieldElement30.IsZero)
{
return(Twice());
}
return(curve.Infinity);
}
ECFieldElement eCFieldElement31 = eCFieldElement30.Divide(eCFieldElement29);
ECFieldElement eCFieldElement32 = eCFieldElement31.Square().Add(eCFieldElement31).Add(eCFieldElement29)
.Add(curve.A);
ECFieldElement y3 = eCFieldElement31.Multiply(rawXCoord.Add(eCFieldElement32)).Add(eCFieldElement32).Add(rawYCoord5);
return(new F2mPoint(curve, eCFieldElement32, y3, base.IsCompressed));
}
case 1:
{
ECFieldElement rawYCoord3 = base.RawYCoord;
ECFieldElement eCFieldElement16 = base.RawZCoords[0];
ECFieldElement rawYCoord4 = b.RawYCoord;
ECFieldElement eCFieldElement17 = b.RawZCoords[0];
bool isOne3 = eCFieldElement16.IsOne;
ECFieldElement eCFieldElement18 = rawYCoord4;
ECFieldElement eCFieldElement19 = rawXCoord2;
if (!isOne3)
{
eCFieldElement18 = eCFieldElement18.Multiply(eCFieldElement16);
eCFieldElement19 = eCFieldElement19.Multiply(eCFieldElement16);
}
bool isOne4 = eCFieldElement17.IsOne;
ECFieldElement eCFieldElement20 = rawYCoord3;
ECFieldElement eCFieldElement21 = rawXCoord;
if (!isOne4)
{
eCFieldElement20 = eCFieldElement20.Multiply(eCFieldElement17);
eCFieldElement21 = eCFieldElement21.Multiply(eCFieldElement17);
}
ECFieldElement eCFieldElement22 = eCFieldElement18.Add(eCFieldElement20);
ECFieldElement eCFieldElement23 = eCFieldElement19.Add(eCFieldElement21);
if (eCFieldElement23.IsZero)
{
if (eCFieldElement22.IsZero)
{
return(Twice());
}
return(curve.Infinity);
}
ECFieldElement eCFieldElement24 = eCFieldElement23.Square();
ECFieldElement eCFieldElement25 = eCFieldElement24.Multiply(eCFieldElement23);
ECFieldElement b3 = isOne3 ? eCFieldElement17 : ((!isOne4) ? eCFieldElement16.Multiply(eCFieldElement17) : eCFieldElement16);
ECFieldElement eCFieldElement26 = eCFieldElement22.Add(eCFieldElement23);
ECFieldElement eCFieldElement27 = eCFieldElement26.MultiplyPlusProduct(eCFieldElement22, eCFieldElement24, curve.A).Multiply(b3).Add(eCFieldElement25);
ECFieldElement x = eCFieldElement23.Multiply(eCFieldElement27);
ECFieldElement b4 = (!isOne4) ? eCFieldElement24.Multiply(eCFieldElement17) : eCFieldElement24;
ECFieldElement y2 = eCFieldElement22.MultiplyPlusProduct(rawXCoord, eCFieldElement23, rawYCoord3).MultiplyPlusProduct(b4, eCFieldElement26, eCFieldElement27);
ECFieldElement eCFieldElement28 = eCFieldElement25.Multiply(b3);
return(new F2mPoint(curve, x, y2, new ECFieldElement[1]
{
eCFieldElement28
}, base.IsCompressed));
}
case 6:
{
if (rawXCoord.IsZero)
{
if (rawXCoord2.IsZero)
{
return(curve.Infinity);
}
return(b.Add(this));
}
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement eCFieldElement = base.RawZCoords[0];
ECFieldElement rawYCoord2 = b.RawYCoord;
ECFieldElement eCFieldElement2 = b.RawZCoords[0];
bool isOne = eCFieldElement.IsOne;
ECFieldElement eCFieldElement3 = rawXCoord2;
ECFieldElement eCFieldElement4 = rawYCoord2;
if (!isOne)
{
eCFieldElement3 = eCFieldElement3.Multiply(eCFieldElement);
eCFieldElement4 = eCFieldElement4.Multiply(eCFieldElement);
}
bool isOne2 = eCFieldElement2.IsOne;
ECFieldElement eCFieldElement5 = rawXCoord;
ECFieldElement eCFieldElement6 = rawYCoord;
if (!isOne2)
{
eCFieldElement5 = eCFieldElement5.Multiply(eCFieldElement2);
eCFieldElement6 = eCFieldElement6.Multiply(eCFieldElement2);
}
ECFieldElement eCFieldElement7 = eCFieldElement6.Add(eCFieldElement4);
ECFieldElement eCFieldElement8 = eCFieldElement5.Add(eCFieldElement3);
if (eCFieldElement8.IsZero)
{
if (eCFieldElement7.IsZero)
{
return(Twice());
}
return(curve.Infinity);
}
ECFieldElement eCFieldElement10;
ECFieldElement y;
ECFieldElement eCFieldElement12;
if (rawXCoord2.IsZero)
{
ECPoint eCPoint = Normalize();
rawXCoord = eCPoint.RawXCoord;
ECFieldElement yCoord = eCPoint.YCoord;
ECFieldElement b2 = rawYCoord2;
ECFieldElement eCFieldElement9 = yCoord.Add(b2).Divide(rawXCoord);
eCFieldElement10 = eCFieldElement9.Square().Add(eCFieldElement9).Add(rawXCoord)
.Add(curve.A);
if (eCFieldElement10.IsZero)
{
return(new F2mPoint(curve, eCFieldElement10, curve.B.Sqrt(), base.IsCompressed));
}
ECFieldElement eCFieldElement11 = eCFieldElement9.Multiply(rawXCoord.Add(eCFieldElement10)).Add(eCFieldElement10).Add(yCoord);
y = eCFieldElement11.Divide(eCFieldElement10).Add(eCFieldElement10);
eCFieldElement12 = curve.FromBigInteger(BigInteger.One);
}
else
{
eCFieldElement8 = eCFieldElement8.Square();
ECFieldElement eCFieldElement13 = eCFieldElement7.Multiply(eCFieldElement5);
ECFieldElement eCFieldElement14 = eCFieldElement7.Multiply(eCFieldElement3);
eCFieldElement10 = eCFieldElement13.Multiply(eCFieldElement14);
if (eCFieldElement10.IsZero)
{
return(new F2mPoint(curve, eCFieldElement10, curve.B.Sqrt(), base.IsCompressed));
}
ECFieldElement eCFieldElement15 = eCFieldElement7.Multiply(eCFieldElement8);
if (!isOne2)
{
eCFieldElement15 = eCFieldElement15.Multiply(eCFieldElement2);
}
y = eCFieldElement14.Add(eCFieldElement8).SquarePlusProduct(eCFieldElement15, rawYCoord.Add(eCFieldElement));
eCFieldElement12 = eCFieldElement15;
if (!isOne)
{
eCFieldElement12 = eCFieldElement12.Multiply(eCFieldElement);
}
}
return(new F2mPoint(curve, eCFieldElement10, y, new ECFieldElement[1]
{
eCFieldElement12
}, base.IsCompressed));
}
default:
throw new InvalidOperationException("unsupported coordinate system");
}
}
return(this);
}
public override ECPoint Twice()
{
if (base.IsInfinity)
{
return(this);
}
ECCurve curve = Curve;
ECFieldElement rawXCoord = base.RawXCoord;
if (!rawXCoord.IsZero)
{
switch (curve.CoordinateSystem)
{
case 0:
{
ECFieldElement rawYCoord2 = base.RawYCoord;
ECFieldElement eCFieldElement11 = rawYCoord2.Divide(rawXCoord).Add(rawXCoord);
ECFieldElement x = eCFieldElement11.Square().Add(eCFieldElement11).Add(curve.A);
ECFieldElement y = rawXCoord.SquarePlusProduct(x, eCFieldElement11.AddOne());
return(new F2mPoint(curve, x, y, base.IsCompressed));
}
case 1:
{
ECFieldElement rawYCoord3 = base.RawYCoord;
ECFieldElement eCFieldElement12 = base.RawZCoords[0];
bool isOne2 = eCFieldElement12.IsOne;
ECFieldElement eCFieldElement13 = (!isOne2) ? rawXCoord.Multiply(eCFieldElement12) : rawXCoord;
ECFieldElement b3 = (!isOne2) ? rawYCoord3.Multiply(eCFieldElement12) : rawYCoord3;
ECFieldElement eCFieldElement14 = rawXCoord.Square();
ECFieldElement eCFieldElement15 = eCFieldElement14.Add(b3);
ECFieldElement eCFieldElement16 = eCFieldElement13;
ECFieldElement eCFieldElement17 = eCFieldElement16.Square();
ECFieldElement eCFieldElement18 = eCFieldElement15.Add(eCFieldElement16);
ECFieldElement eCFieldElement19 = eCFieldElement18.MultiplyPlusProduct(eCFieldElement15, eCFieldElement17, curve.A);
ECFieldElement x2 = eCFieldElement16.Multiply(eCFieldElement19);
ECFieldElement y2 = eCFieldElement14.Square().MultiplyPlusProduct(eCFieldElement16, eCFieldElement19, eCFieldElement18);
ECFieldElement eCFieldElement20 = eCFieldElement16.Multiply(eCFieldElement17);
return(new F2mPoint(curve, x2, y2, new ECFieldElement[1]
{
eCFieldElement20
}, base.IsCompressed));
}
case 6:
{
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement eCFieldElement = base.RawZCoords[0];
bool isOne = eCFieldElement.IsOne;
ECFieldElement eCFieldElement2 = (!isOne) ? rawYCoord.Multiply(eCFieldElement) : rawYCoord;
ECFieldElement eCFieldElement3 = (!isOne) ? eCFieldElement.Square() : eCFieldElement;
ECFieldElement a = curve.A;
ECFieldElement eCFieldElement4 = (!isOne) ? a.Multiply(eCFieldElement3) : a;
ECFieldElement eCFieldElement5 = rawYCoord.Square().Add(eCFieldElement2).Add(eCFieldElement4);
if (eCFieldElement5.IsZero)
{
return(new F2mPoint(curve, eCFieldElement5, curve.B.Sqrt(), base.IsCompressed));
}
ECFieldElement eCFieldElement6 = eCFieldElement5.Square();
ECFieldElement eCFieldElement7 = (!isOne) ? eCFieldElement5.Multiply(eCFieldElement3) : eCFieldElement5;
ECFieldElement b = curve.B;
ECFieldElement eCFieldElement9;
if (b.BitLength < curve.FieldSize >> 1)
{
ECFieldElement eCFieldElement8 = rawYCoord.Add(rawXCoord).Square();
ECFieldElement b2 = (!b.IsOne) ? eCFieldElement4.SquarePlusProduct(b, eCFieldElement3.Square()) : eCFieldElement4.Add(eCFieldElement3).Square();
eCFieldElement9 = eCFieldElement8.Add(eCFieldElement5).Add(eCFieldElement3).Multiply(eCFieldElement8)
.Add(b2)
.Add(eCFieldElement6);
if (a.IsZero)
{
eCFieldElement9 = eCFieldElement9.Add(eCFieldElement7);
}
else if (!a.IsOne)
{
eCFieldElement9 = eCFieldElement9.Add(a.AddOne().Multiply(eCFieldElement7));
}
}
else
{
ECFieldElement eCFieldElement10 = (!isOne) ? rawXCoord.Multiply(eCFieldElement) : rawXCoord;
eCFieldElement9 = eCFieldElement10.SquarePlusProduct(eCFieldElement5, eCFieldElement2).Add(eCFieldElement6).Add(eCFieldElement7);
}
return(new F2mPoint(curve, eCFieldElement6, eCFieldElement9, new ECFieldElement[1]
{
eCFieldElement7
}, base.IsCompressed));
}
default:
throw new InvalidOperationException("unsupported coordinate system");
}
}
return(curve.Infinity);
}
public override ECPoint Add(ECPoint b)
{
//IL_04b2: Unknown result type (might be due to invalid IL or missing references)
if (base.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
if (this == b)
{
return(Twice());
}
ECCurve curve = Curve;
int coordinateSystem = curve.CoordinateSystem;
ECFieldElement rawXCoord = base.RawXCoord;
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement rawXCoord2 = b.RawXCoord;
ECFieldElement rawYCoord2 = b.RawYCoord;
switch (coordinateSystem)
{
case 0:
{
ECFieldElement eCFieldElement32 = rawXCoord2.Subtract(rawXCoord);
ECFieldElement eCFieldElement33 = rawYCoord2.Subtract(rawYCoord);
if (eCFieldElement32.IsZero)
{
if (eCFieldElement33.IsZero)
{
return(Twice());
}
return(Curve.Infinity);
}
ECFieldElement eCFieldElement34 = eCFieldElement33.Divide(eCFieldElement32);
ECFieldElement eCFieldElement35 = eCFieldElement34.Square().Subtract(rawXCoord).Subtract(rawXCoord2);
ECFieldElement y3 = eCFieldElement34.Multiply(rawXCoord.Subtract(eCFieldElement35)).Subtract(rawYCoord);
return(new FpPoint(Curve, eCFieldElement35, y3, base.IsCompressed));
}
case 1:
{
ECFieldElement eCFieldElement21 = base.RawZCoords[0];
ECFieldElement eCFieldElement22 = b.RawZCoords[0];
bool isOne3 = eCFieldElement21.IsOne;
bool isOne4 = eCFieldElement22.IsOne;
ECFieldElement eCFieldElement23 = (isOne3 ? rawYCoord2 : rawYCoord2.Multiply(eCFieldElement21));
ECFieldElement eCFieldElement24 = (isOne4 ? rawYCoord : rawYCoord.Multiply(eCFieldElement22));
ECFieldElement eCFieldElement25 = eCFieldElement23.Subtract(eCFieldElement24);
ECFieldElement eCFieldElement26 = (isOne3 ? rawXCoord2 : rawXCoord2.Multiply(eCFieldElement21));
ECFieldElement b6 = (isOne4 ? rawXCoord : rawXCoord.Multiply(eCFieldElement22));
ECFieldElement eCFieldElement27 = eCFieldElement26.Subtract(b6);
if (eCFieldElement27.IsZero)
{
if (eCFieldElement25.IsZero)
{
return(Twice());
}
return(curve.Infinity);
}
ECFieldElement b7 = (isOne3 ? eCFieldElement22 : (isOne4 ? eCFieldElement21 : eCFieldElement21.Multiply(eCFieldElement22)));
ECFieldElement eCFieldElement28 = eCFieldElement27.Square();
ECFieldElement eCFieldElement29 = eCFieldElement28.Multiply(eCFieldElement27);
ECFieldElement eCFieldElement30 = eCFieldElement28.Multiply(b6);
ECFieldElement b8 = eCFieldElement25.Square().Multiply(b7).Subtract(eCFieldElement29)
.Subtract(Two(eCFieldElement30));
ECFieldElement x = eCFieldElement27.Multiply(b8);
ECFieldElement y2 = eCFieldElement30.Subtract(b8).MultiplyMinusProduct(eCFieldElement25, eCFieldElement24, eCFieldElement29);
ECFieldElement eCFieldElement31 = eCFieldElement29.Multiply(b7);
return(new FpPoint(curve, x, y2, new ECFieldElement[1] {
eCFieldElement31
}, base.IsCompressed));
}
case 2:
case 4:
{
ECFieldElement eCFieldElement = base.RawZCoords[0];
ECFieldElement eCFieldElement2 = b.RawZCoords[0];
bool isOne = eCFieldElement.IsOne;
ECFieldElement zSquared = null;
ECFieldElement eCFieldElement7;
ECFieldElement y;
ECFieldElement eCFieldElement8;
if (!isOne && eCFieldElement.Equals(eCFieldElement2))
{
ECFieldElement eCFieldElement3 = rawXCoord.Subtract(rawXCoord2);
ECFieldElement eCFieldElement4 = rawYCoord.Subtract(rawYCoord2);
if (eCFieldElement3.IsZero)
{
if (eCFieldElement4.IsZero)
{
return(Twice());
}
return(curve.Infinity);
}
ECFieldElement eCFieldElement5 = eCFieldElement3.Square();
ECFieldElement eCFieldElement6 = rawXCoord.Multiply(eCFieldElement5);
ECFieldElement b2 = rawXCoord2.Multiply(eCFieldElement5);
ECFieldElement b3 = eCFieldElement6.Subtract(b2).Multiply(rawYCoord);
eCFieldElement7 = eCFieldElement4.Square().Subtract(eCFieldElement6).Subtract(b2);
y = eCFieldElement6.Subtract(eCFieldElement7).Multiply(eCFieldElement4).Subtract(b3);
eCFieldElement8 = eCFieldElement3;
if (isOne)
{
zSquared = eCFieldElement5;
}
else
{
eCFieldElement8 = eCFieldElement8.Multiply(eCFieldElement);
}
}
else
{
ECFieldElement b4;
ECFieldElement b5;
if (isOne)
{
ECFieldElement eCFieldElement9 = eCFieldElement;
b4 = rawXCoord2;
b5 = rawYCoord2;
}
else
{
ECFieldElement eCFieldElement9 = eCFieldElement.Square();
b4 = eCFieldElement9.Multiply(rawXCoord2);
ECFieldElement eCFieldElement10 = eCFieldElement9.Multiply(eCFieldElement);
b5 = eCFieldElement10.Multiply(rawYCoord2);
}
bool isOne2 = eCFieldElement2.IsOne;
ECFieldElement eCFieldElement12;
ECFieldElement eCFieldElement13;
if (isOne2)
{
ECFieldElement eCFieldElement11 = eCFieldElement2;
eCFieldElement12 = rawXCoord;
eCFieldElement13 = rawYCoord;
}
else
{
ECFieldElement eCFieldElement11 = eCFieldElement2.Square();
eCFieldElement12 = eCFieldElement11.Multiply(rawXCoord);
ECFieldElement eCFieldElement14 = eCFieldElement11.Multiply(eCFieldElement2);
eCFieldElement13 = eCFieldElement14.Multiply(rawYCoord);
}
ECFieldElement eCFieldElement15 = eCFieldElement12.Subtract(b4);
ECFieldElement eCFieldElement16 = eCFieldElement13.Subtract(b5);
if (eCFieldElement15.IsZero)
{
if (eCFieldElement16.IsZero)
{
return(Twice());
}
return(curve.Infinity);
}
ECFieldElement eCFieldElement17 = eCFieldElement15.Square();
ECFieldElement eCFieldElement18 = eCFieldElement17.Multiply(eCFieldElement15);
ECFieldElement eCFieldElement19 = eCFieldElement17.Multiply(eCFieldElement12);
eCFieldElement7 = eCFieldElement16.Square().Add(eCFieldElement18).Subtract(Two(eCFieldElement19));
y = eCFieldElement19.Subtract(eCFieldElement7).MultiplyMinusProduct(eCFieldElement16, eCFieldElement18, eCFieldElement13);
eCFieldElement8 = eCFieldElement15;
if (!isOne)
{
eCFieldElement8 = eCFieldElement8.Multiply(eCFieldElement);
}
if (!isOne2)
{
eCFieldElement8 = eCFieldElement8.Multiply(eCFieldElement2);
}
if (eCFieldElement8 == eCFieldElement15)
{
zSquared = eCFieldElement17;
}
}
ECFieldElement[] zs;
if (coordinateSystem == 4)
{
ECFieldElement eCFieldElement20 = CalculateJacobianModifiedW(eCFieldElement8, zSquared);
zs = new ECFieldElement[2] {
eCFieldElement8, eCFieldElement20
};
}
else
{
zs = new ECFieldElement[1] {
eCFieldElement8
};
}
return(new FpPoint(curve, eCFieldElement7, y, zs, base.IsCompressed));
}
default:
throw new InvalidOperationException("unsupported coordinate system");
}
}
public override ECPoint Add(ECPoint b)
{
ECFieldElement element28;
ECFieldElement element29;
ECFieldElement element30;
ECFieldElement element31;
ECFieldElement[] elementArray;
if (base.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
if (this == b)
{
return(this.Twice());
}
ECCurve curve = this.Curve;
int coordinateSystem = curve.CoordinateSystem;
ECFieldElement rawXCoord = base.RawXCoord;
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement element3 = b.RawXCoord;
ECFieldElement element4 = b.RawYCoord;
switch (coordinateSystem)
{
case 0:
{
ECFieldElement element5 = element3.Subtract(rawXCoord);
ECFieldElement element6 = element4.Subtract(rawYCoord);
if (!element5.IsZero)
{
ECFieldElement element7 = element6.Divide(element5);
ECFieldElement x = element7.Square().Subtract(rawXCoord).Subtract(element3);
return(new FpPoint(this.Curve, x, element7.Multiply(rawXCoord.Subtract(x)).Subtract(rawYCoord), base.IsCompressed));
}
if (!element6.IsZero)
{
return(this.Curve.Infinity);
}
return(this.Twice());
}
case 1:
{
ECFieldElement element10 = base.RawZCoords[0];
ECFieldElement element11 = b.RawZCoords[0];
bool isOne = element10.IsOne;
bool flag2 = element11.IsOne;
ECFieldElement element12 = !isOne?element4.Multiply(element10) : element4;
ECFieldElement element13 = !flag2?rawYCoord.Multiply(element11) : rawYCoord;
ECFieldElement element14 = element12.Subtract(element13);
ECFieldElement element15 = !isOne?element3.Multiply(element10) : element3;
ECFieldElement element16 = !flag2?rawXCoord.Multiply(element11) : rawXCoord;
ECFieldElement element17 = element15.Subtract(element16);
if (!element17.IsZero)
{
ECFieldElement element18 = !isOne ? (!flag2 ? element10.Multiply(element11) : element10) : element11;
ECFieldElement element19 = element17.Square();
ECFieldElement element20 = element19.Multiply(element17);
ECFieldElement x = element19.Multiply(element16);
ECFieldElement element22 = element14.Square().Multiply(element18).Subtract(element20).Subtract(this.Two(x));
ECFieldElement element23 = element17.Multiply(element22);
ECFieldElement y = x.Subtract(element22).MultiplyMinusProduct(element14, element13, element20);
ECFieldElement element25 = element20.Multiply(element18);
return(new FpPoint(curve, element23, y, new ECFieldElement[] { element25 }, base.IsCompressed));
}
if (!element14.IsZero)
{
return(curve.Infinity);
}
return(this.Twice());
}
case 2:
case 4:
{
ECFieldElement element26 = base.RawZCoords[0];
ECFieldElement other = b.RawZCoords[0];
bool isOne = element26.IsOne;
element31 = null;
if (isOne || !element26.Equals(other))
{
ECFieldElement element38;
ECFieldElement element39;
ECFieldElement element40;
ECFieldElement element42;
ECFieldElement element43;
ECFieldElement element44;
if (isOne)
{
element38 = element26;
element39 = element3;
element40 = element4;
}
else
{
element38 = element26.Square();
element39 = element38.Multiply(element3);
element40 = element38.Multiply(element26).Multiply(element4);
}
bool flag4 = other.IsOne;
if (flag4)
{
element42 = other;
element43 = rawXCoord;
element44 = rawYCoord;
}
else
{
element42 = other.Square();
element43 = element42.Multiply(rawXCoord);
element44 = element42.Multiply(other).Multiply(rawYCoord);
}
ECFieldElement element46 = element43.Subtract(element39);
ECFieldElement element47 = element44.Subtract(element40);
if (element46.IsZero)
{
if (element47.IsZero)
{
return(this.Twice());
}
return(curve.Infinity);
}
ECFieldElement element48 = element46.Square();
ECFieldElement element49 = element48.Multiply(element46);
ECFieldElement x = element48.Multiply(element43);
element28 = element47.Square().Add(element49).Subtract(this.Two(x));
element29 = x.Subtract(element28).MultiplyMinusProduct(element47, element49, element44);
element30 = element46;
if (!isOne)
{
element30 = element30.Multiply(element26);
}
if (!flag4)
{
element30 = element30.Multiply(other);
}
if (element30 == element46)
{
element31 = element48;
}
break;
}
ECFieldElement element32 = rawXCoord.Subtract(element3);
ECFieldElement element33 = rawYCoord.Subtract(element4);
if (!element32.IsZero)
{
ECFieldElement element34 = element32.Square();
ECFieldElement element35 = rawXCoord.Multiply(element34);
ECFieldElement element36 = element3.Multiply(element34);
ECFieldElement element37 = element35.Subtract(element36).Multiply(rawYCoord);
element28 = element33.Square().Subtract(element35).Subtract(element36);
element29 = element35.Subtract(element28).Multiply(element33).Subtract(element37);
element30 = element32;
if (isOne)
{
element31 = element34;
}
else
{
element30 = element30.Multiply(element26);
}
break;
}
if (!element33.IsZero)
{
return(curve.Infinity);
}
return(this.Twice());
}
default:
throw new InvalidOperationException("unsupported coordinate system");
}
if (coordinateSystem == 4)
{
ECFieldElement element51 = this.CalculateJacobianModifiedW(element30, element31);
elementArray = new ECFieldElement[] { element30, element51 };
}
else
{
elementArray = new ECFieldElement[] { element30 };
}
return(new FpPoint(curve, element28, element29, elementArray, base.IsCompressed));
}
public override ECPoint Add(ECPoint b)
{
if (base.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
if (this == b)
{
return(this.Twice());
}
ECCurve curve = this.Curve;
int coordinateSystem = curve.CoordinateSystem;
ECFieldElement rawXCoord = base.RawXCoord;
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement rawXCoord2 = b.RawXCoord;
ECFieldElement rawYCoord2 = b.RawYCoord;
switch (coordinateSystem)
{
case 0:
{
ECFieldElement eCFieldElement = rawXCoord2.Subtract(rawXCoord);
ECFieldElement eCFieldElement2 = rawYCoord2.Subtract(rawYCoord);
if (!eCFieldElement.IsZero)
{
ECFieldElement eCFieldElement3 = eCFieldElement2.Divide(eCFieldElement);
ECFieldElement eCFieldElement4 = eCFieldElement3.Square().Subtract(rawXCoord).Subtract(rawXCoord2);
ECFieldElement y = eCFieldElement3.Multiply(rawXCoord.Subtract(eCFieldElement4)).Subtract(rawYCoord);
return(new FpPoint(this.Curve, eCFieldElement4, y, base.IsCompressed));
}
if (eCFieldElement2.IsZero)
{
return(this.Twice());
}
return(this.Curve.Infinity);
}
case 1:
{
ECFieldElement eCFieldElement5 = base.RawZCoords[0];
ECFieldElement eCFieldElement6 = b.RawZCoords[0];
bool isOne = eCFieldElement5.IsOne;
bool isOne2 = eCFieldElement6.IsOne;
ECFieldElement eCFieldElement7 = isOne ? rawYCoord2 : rawYCoord2.Multiply(eCFieldElement5);
ECFieldElement eCFieldElement8 = isOne2 ? rawYCoord : rawYCoord.Multiply(eCFieldElement6);
ECFieldElement eCFieldElement9 = eCFieldElement7.Subtract(eCFieldElement8);
ECFieldElement eCFieldElement10 = isOne ? rawXCoord2 : rawXCoord2.Multiply(eCFieldElement5);
ECFieldElement b2 = isOne2 ? rawXCoord : rawXCoord.Multiply(eCFieldElement6);
ECFieldElement eCFieldElement11 = eCFieldElement10.Subtract(b2);
if (!eCFieldElement11.IsZero)
{
ECFieldElement b3 = isOne ? eCFieldElement6 : (isOne2 ? eCFieldElement5 : eCFieldElement5.Multiply(eCFieldElement6));
ECFieldElement eCFieldElement12 = eCFieldElement11.Square();
ECFieldElement eCFieldElement13 = eCFieldElement12.Multiply(eCFieldElement11);
ECFieldElement eCFieldElement14 = eCFieldElement12.Multiply(b2);
ECFieldElement b4 = eCFieldElement9.Square().Multiply(b3).Subtract(eCFieldElement13).Subtract(this.Two(eCFieldElement14));
ECFieldElement x = eCFieldElement11.Multiply(b4);
ECFieldElement y2 = eCFieldElement14.Subtract(b4).MultiplyMinusProduct(eCFieldElement9, eCFieldElement8, eCFieldElement13);
ECFieldElement eCFieldElement15 = eCFieldElement13.Multiply(b3);
return(new FpPoint(curve, x, y2, new ECFieldElement[]
{
eCFieldElement15
}, base.IsCompressed));
}
if (eCFieldElement9.IsZero)
{
return(this.Twice());
}
return(curve.Infinity);
}
case 2:
case 4:
{
ECFieldElement eCFieldElement16 = base.RawZCoords[0];
ECFieldElement eCFieldElement17 = b.RawZCoords[0];
bool isOne3 = eCFieldElement16.IsOne;
ECFieldElement zSquared = null;
ECFieldElement eCFieldElement22;
ECFieldElement y3;
ECFieldElement eCFieldElement23;
if (!isOne3 && eCFieldElement16.Equals(eCFieldElement17))
{
ECFieldElement eCFieldElement18 = rawXCoord.Subtract(rawXCoord2);
ECFieldElement eCFieldElement19 = rawYCoord.Subtract(rawYCoord2);
if (eCFieldElement18.IsZero)
{
if (eCFieldElement19.IsZero)
{
return(this.Twice());
}
return(curve.Infinity);
}
else
{
ECFieldElement eCFieldElement20 = eCFieldElement18.Square();
ECFieldElement eCFieldElement21 = rawXCoord.Multiply(eCFieldElement20);
ECFieldElement b5 = rawXCoord2.Multiply(eCFieldElement20);
ECFieldElement b6 = eCFieldElement21.Subtract(b5).Multiply(rawYCoord);
eCFieldElement22 = eCFieldElement19.Square().Subtract(eCFieldElement21).Subtract(b5);
y3 = eCFieldElement21.Subtract(eCFieldElement22).Multiply(eCFieldElement19).Subtract(b6);
eCFieldElement23 = eCFieldElement18;
if (isOne3)
{
zSquared = eCFieldElement20;
}
else
{
eCFieldElement23 = eCFieldElement23.Multiply(eCFieldElement16);
}
}
}
else
{
ECFieldElement b7;
ECFieldElement b8;
if (isOne3)
{
b7 = rawXCoord2;
b8 = rawYCoord2;
}
else
{
ECFieldElement eCFieldElement24 = eCFieldElement16.Square();
b7 = eCFieldElement24.Multiply(rawXCoord2);
ECFieldElement eCFieldElement25 = eCFieldElement24.Multiply(eCFieldElement16);
b8 = eCFieldElement25.Multiply(rawYCoord2);
}
bool isOne4 = eCFieldElement17.IsOne;
ECFieldElement eCFieldElement26;
ECFieldElement eCFieldElement27;
if (isOne4)
{
eCFieldElement26 = rawXCoord;
eCFieldElement27 = rawYCoord;
}
else
{
ECFieldElement eCFieldElement28 = eCFieldElement17.Square();
eCFieldElement26 = eCFieldElement28.Multiply(rawXCoord);
ECFieldElement eCFieldElement29 = eCFieldElement28.Multiply(eCFieldElement17);
eCFieldElement27 = eCFieldElement29.Multiply(rawYCoord);
}
ECFieldElement eCFieldElement30 = eCFieldElement26.Subtract(b7);
ECFieldElement eCFieldElement31 = eCFieldElement27.Subtract(b8);
if (eCFieldElement30.IsZero)
{
if (eCFieldElement31.IsZero)
{
return(this.Twice());
}
return(curve.Infinity);
}
else
{
ECFieldElement eCFieldElement32 = eCFieldElement30.Square();
ECFieldElement eCFieldElement33 = eCFieldElement32.Multiply(eCFieldElement30);
ECFieldElement eCFieldElement34 = eCFieldElement32.Multiply(eCFieldElement26);
eCFieldElement22 = eCFieldElement31.Square().Add(eCFieldElement33).Subtract(this.Two(eCFieldElement34));
y3 = eCFieldElement34.Subtract(eCFieldElement22).MultiplyMinusProduct(eCFieldElement31, eCFieldElement33, eCFieldElement27);
eCFieldElement23 = eCFieldElement30;
if (!isOne3)
{
eCFieldElement23 = eCFieldElement23.Multiply(eCFieldElement16);
}
if (!isOne4)
{
eCFieldElement23 = eCFieldElement23.Multiply(eCFieldElement17);
}
if (eCFieldElement23 == eCFieldElement30)
{
zSquared = eCFieldElement32;
}
}
}
ECFieldElement[] zs;
if (coordinateSystem == 4)
{
ECFieldElement eCFieldElement35 = this.CalculateJacobianModifiedW(eCFieldElement23, zSquared);
zs = new ECFieldElement[]
{
eCFieldElement23,
eCFieldElement35
};
}
else
{
zs = new ECFieldElement[]
{
eCFieldElement23
};
}
return(new FpPoint(curve, eCFieldElement22, y3, zs, base.IsCompressed));
}
}
throw new InvalidOperationException("unsupported coordinate system");
}
public override ECPoint Add(ECPoint b)
{
if (base.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
ECCurve curve = this.Curve;
int coordinateSystem = curve.CoordinateSystem;
ECFieldElement rawXCoord = base.RawXCoord;
ECFieldElement element2 = b.RawXCoord;
switch (coordinateSystem)
{
case 0:
{
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement element4 = b.RawYCoord;
ECFieldElement element5 = rawXCoord.Add(element2);
ECFieldElement element6 = rawYCoord.Add(element4);
if (!element5.IsZero)
{
ECFieldElement element7 = element6.Divide(element5);
ECFieldElement x = element7.Square().Add(element7).Add(element5).Add(curve.A);
return(new F2mPoint(curve, x, element7.Multiply(rawXCoord.Add(x)).Add(x).Add(rawYCoord), base.IsCompressed));
}
if (element6.IsZero)
{
return(this.Twice());
}
return(curve.Infinity);
}
case 1:
{
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement element11 = base.RawZCoords[0];
ECFieldElement element12 = b.RawYCoord;
ECFieldElement element13 = b.RawZCoords[0];
bool isOne = element11.IsOne;
ECFieldElement element14 = element12;
ECFieldElement element15 = element2;
if (!isOne)
{
element14 = element14.Multiply(element11);
element15 = element15.Multiply(element11);
}
bool flag2 = element13.IsOne;
ECFieldElement element16 = rawYCoord;
ECFieldElement element17 = rawXCoord;
if (!flag2)
{
element16 = element16.Multiply(element13);
element17 = element17.Multiply(element13);
}
ECFieldElement element18 = element14.Add(element16);
ECFieldElement element19 = element15.Add(element17);
if (!element19.IsZero)
{
ECFieldElement x = element19.Square();
ECFieldElement element21 = x.Multiply(element19);
ECFieldElement element22 = !isOne ? (!flag2 ? element11.Multiply(element13) : element11) : element13;
ECFieldElement element23 = element18.Add(element19);
ECFieldElement element24 = element23.MultiplyPlusProduct(element18, x, curve.A).Multiply(element22).Add(element21);
ECFieldElement element25 = element19.Multiply(element24);
ECFieldElement element26 = !flag2?x.Multiply(element13) : x;
ECFieldElement y = element18.MultiplyPlusProduct(rawXCoord, element19, rawYCoord).MultiplyPlusProduct(element26, element23, element24);
ECFieldElement element28 = element21.Multiply(element22);
return(new F2mPoint(curve, element25, y, new ECFieldElement[] { element28 }, base.IsCompressed));
}
if (element18.IsZero)
{
return(this.Twice());
}
return(curve.Infinity);
}
case 6:
if (!rawXCoord.IsZero)
{
ECFieldElement element39;
ECFieldElement element40;
ECFieldElement element41;
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement element30 = base.RawZCoords[0];
ECFieldElement element31 = b.RawYCoord;
ECFieldElement element32 = b.RawZCoords[0];
bool isOne = element30.IsOne;
ECFieldElement element33 = element2;
ECFieldElement element34 = element31;
if (!isOne)
{
element33 = element33.Multiply(element30);
element34 = element34.Multiply(element30);
}
bool flag4 = element32.IsOne;
ECFieldElement element35 = rawXCoord;
ECFieldElement element36 = rawYCoord;
if (!flag4)
{
element35 = element35.Multiply(element32);
element36 = element36.Multiply(element32);
}
ECFieldElement element37 = element36.Add(element34);
ECFieldElement element38 = element35.Add(element33);
if (element38.IsZero)
{
if (element37.IsZero)
{
return(this.Twice());
}
return(curve.Infinity);
}
if (element2.IsZero)
{
ECPoint point = this.Normalize();
rawXCoord = point.RawXCoord;
ECFieldElement yCoord = point.YCoord;
ECFieldElement element43 = element31;
ECFieldElement element44 = yCoord.Add(element43).Divide(rawXCoord);
element39 = element44.Square().Add(element44).Add(rawXCoord).Add(curve.A);
if (element39.IsZero)
{
return(new F2mPoint(curve, element39, curve.B.Sqrt(), base.IsCompressed));
}
element40 = element44.Multiply(rawXCoord.Add(element39)).Add(element39).Add(yCoord).Divide(element39).Add(element39);
element41 = curve.FromBigInteger(BigInteger.One);
}
else
{
element38 = element38.Square();
ECFieldElement element46 = element37.Multiply(element35);
ECFieldElement element47 = element37.Multiply(element33);
element39 = element46.Multiply(element47);
if (element39.IsZero)
{
return(new F2mPoint(curve, element39, curve.B.Sqrt(), base.IsCompressed));
}
ECFieldElement x = element37.Multiply(element38);
if (!flag4)
{
x = x.Multiply(element32);
}
element40 = element47.Add(element38).SquarePlusProduct(x, rawYCoord.Add(element30));
element41 = x;
if (!isOne)
{
element41 = element41.Multiply(element30);
}
}
return(new F2mPoint(curve, element39, element40, new ECFieldElement[] { element41 }, base.IsCompressed));
}
if (element2.IsZero)
{
return(curve.Infinity);
}
return(b.Add(this));
}
throw new InvalidOperationException("unsupported coordinate system");
}
public override ECPoint Add(ECPoint b)
{
if (base.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
ECCurve curve = this.Curve;
int coordinateSystem = curve.CoordinateSystem;
ECFieldElement rawXCoord = base.RawXCoord;
ECFieldElement rawXCoord2 = b.RawXCoord;
int num = coordinateSystem;
switch (num)
{
case 0:
{
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement rawYCoord2 = b.RawYCoord;
ECFieldElement eCFieldElement = rawXCoord.Add(rawXCoord2);
ECFieldElement eCFieldElement2 = rawYCoord.Add(rawYCoord2);
if (!eCFieldElement.IsZero)
{
ECFieldElement eCFieldElement3 = eCFieldElement2.Divide(eCFieldElement);
ECFieldElement eCFieldElement4 = eCFieldElement3.Square().Add(eCFieldElement3).Add(eCFieldElement).Add(curve.A);
ECFieldElement y = eCFieldElement3.Multiply(rawXCoord.Add(eCFieldElement4)).Add(eCFieldElement4).Add(rawYCoord);
return(new F2mPoint(curve, eCFieldElement4, y, base.IsCompressed));
}
if (eCFieldElement2.IsZero)
{
return(this.Twice());
}
return(curve.Infinity);
}
case 1:
{
ECFieldElement rawYCoord3 = base.RawYCoord;
ECFieldElement eCFieldElement5 = base.RawZCoords[0];
ECFieldElement rawYCoord4 = b.RawYCoord;
ECFieldElement eCFieldElement6 = b.RawZCoords[0];
bool isOne = eCFieldElement5.IsOne;
ECFieldElement eCFieldElement7 = rawYCoord4;
ECFieldElement eCFieldElement8 = rawXCoord2;
if (!isOne)
{
eCFieldElement7 = eCFieldElement7.Multiply(eCFieldElement5);
eCFieldElement8 = eCFieldElement8.Multiply(eCFieldElement5);
}
bool isOne2 = eCFieldElement6.IsOne;
ECFieldElement eCFieldElement9 = rawYCoord3;
ECFieldElement eCFieldElement10 = rawXCoord;
if (!isOne2)
{
eCFieldElement9 = eCFieldElement9.Multiply(eCFieldElement6);
eCFieldElement10 = eCFieldElement10.Multiply(eCFieldElement6);
}
ECFieldElement eCFieldElement11 = eCFieldElement7.Add(eCFieldElement9);
ECFieldElement eCFieldElement12 = eCFieldElement8.Add(eCFieldElement10);
if (!eCFieldElement12.IsZero)
{
ECFieldElement eCFieldElement13 = eCFieldElement12.Square();
ECFieldElement eCFieldElement14 = eCFieldElement13.Multiply(eCFieldElement12);
ECFieldElement b2 = isOne ? eCFieldElement6 : (isOne2 ? eCFieldElement5 : eCFieldElement5.Multiply(eCFieldElement6));
ECFieldElement eCFieldElement15 = eCFieldElement11.Add(eCFieldElement12);
ECFieldElement eCFieldElement16 = eCFieldElement15.MultiplyPlusProduct(eCFieldElement11, eCFieldElement13, curve.A).Multiply(b2).Add(eCFieldElement14);
ECFieldElement x = eCFieldElement12.Multiply(eCFieldElement16);
ECFieldElement b3 = isOne2 ? eCFieldElement13 : eCFieldElement13.Multiply(eCFieldElement6);
ECFieldElement y2 = eCFieldElement11.MultiplyPlusProduct(rawXCoord, eCFieldElement12, rawYCoord3).MultiplyPlusProduct(b3, eCFieldElement15, eCFieldElement16);
ECFieldElement eCFieldElement17 = eCFieldElement14.Multiply(b2);
return(new F2mPoint(curve, x, y2, new ECFieldElement[]
{
eCFieldElement17
}, base.IsCompressed));
}
if (eCFieldElement11.IsZero)
{
return(this.Twice());
}
return(curve.Infinity);
}
default:
if (num != 6)
{
throw new InvalidOperationException("unsupported coordinate system");
}
if (rawXCoord.IsZero)
{
if (rawXCoord2.IsZero)
{
return(curve.Infinity);
}
return(b.Add(this));
}
else
{
ECFieldElement rawYCoord5 = base.RawYCoord;
ECFieldElement eCFieldElement18 = base.RawZCoords[0];
ECFieldElement rawYCoord6 = b.RawYCoord;
ECFieldElement eCFieldElement19 = b.RawZCoords[0];
bool isOne3 = eCFieldElement18.IsOne;
ECFieldElement eCFieldElement20 = rawXCoord2;
ECFieldElement eCFieldElement21 = rawYCoord6;
if (!isOne3)
{
eCFieldElement20 = eCFieldElement20.Multiply(eCFieldElement18);
eCFieldElement21 = eCFieldElement21.Multiply(eCFieldElement18);
}
bool isOne4 = eCFieldElement19.IsOne;
ECFieldElement eCFieldElement22 = rawXCoord;
ECFieldElement eCFieldElement23 = rawYCoord5;
if (!isOne4)
{
eCFieldElement22 = eCFieldElement22.Multiply(eCFieldElement19);
eCFieldElement23 = eCFieldElement23.Multiply(eCFieldElement19);
}
ECFieldElement eCFieldElement24 = eCFieldElement23.Add(eCFieldElement21);
ECFieldElement eCFieldElement25 = eCFieldElement22.Add(eCFieldElement20);
if (!eCFieldElement25.IsZero)
{
ECFieldElement eCFieldElement27;
ECFieldElement y3;
ECFieldElement eCFieldElement29;
if (rawXCoord2.IsZero)
{
ECPoint eCPoint = this.Normalize();
rawXCoord = eCPoint.RawXCoord;
ECFieldElement yCoord = eCPoint.YCoord;
ECFieldElement b4 = rawYCoord6;
ECFieldElement eCFieldElement26 = yCoord.Add(b4).Divide(rawXCoord);
eCFieldElement27 = eCFieldElement26.Square().Add(eCFieldElement26).Add(rawXCoord).Add(curve.A);
if (eCFieldElement27.IsZero)
{
return(new F2mPoint(curve, eCFieldElement27, curve.B.Sqrt(), base.IsCompressed));
}
ECFieldElement eCFieldElement28 = eCFieldElement26.Multiply(rawXCoord.Add(eCFieldElement27)).Add(eCFieldElement27).Add(yCoord);
y3 = eCFieldElement28.Divide(eCFieldElement27).Add(eCFieldElement27);
eCFieldElement29 = curve.FromBigInteger(BigInteger.One);
}
else
{
eCFieldElement25 = eCFieldElement25.Square();
ECFieldElement eCFieldElement30 = eCFieldElement24.Multiply(eCFieldElement22);
ECFieldElement eCFieldElement31 = eCFieldElement24.Multiply(eCFieldElement20);
eCFieldElement27 = eCFieldElement30.Multiply(eCFieldElement31);
if (eCFieldElement27.IsZero)
{
return(new F2mPoint(curve, eCFieldElement27, curve.B.Sqrt(), base.IsCompressed));
}
ECFieldElement eCFieldElement32 = eCFieldElement24.Multiply(eCFieldElement25);
if (!isOne4)
{
eCFieldElement32 = eCFieldElement32.Multiply(eCFieldElement19);
}
y3 = eCFieldElement31.Add(eCFieldElement25).SquarePlusProduct(eCFieldElement32, rawYCoord5.Add(eCFieldElement18));
eCFieldElement29 = eCFieldElement32;
if (!isOne3)
{
eCFieldElement29 = eCFieldElement29.Multiply(eCFieldElement18);
}
}
return(new F2mPoint(curve, eCFieldElement27, y3, new ECFieldElement[]
{
eCFieldElement29
}, base.IsCompressed));
}
if (eCFieldElement24.IsZero)
{
return(this.Twice());
}
return(curve.Infinity);
}
break;
}
}
public override ECPoint Twice()
{
if (base.IsInfinity)
{
return(this);
}
ECCurve curve = this.Curve;
ECFieldElement rawXCoord = base.RawXCoord;
if (rawXCoord.IsZero)
{
return(curve.Infinity);
}
int coordinateSystem = curve.CoordinateSystem;
int num = coordinateSystem;
switch (num)
{
case 0:
{
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement eCFieldElement = rawYCoord.Divide(rawXCoord).Add(rawXCoord);
ECFieldElement x = eCFieldElement.Square().Add(eCFieldElement).Add(curve.A);
ECFieldElement y = rawXCoord.SquarePlusProduct(x, eCFieldElement.AddOne());
return(new F2mPoint(curve, x, y, base.IsCompressed));
}
case 1:
{
ECFieldElement rawYCoord2 = base.RawYCoord;
ECFieldElement eCFieldElement2 = base.RawZCoords[0];
bool isOne = eCFieldElement2.IsOne;
ECFieldElement eCFieldElement3 = isOne ? rawXCoord : rawXCoord.Multiply(eCFieldElement2);
ECFieldElement b = isOne ? rawYCoord2 : rawYCoord2.Multiply(eCFieldElement2);
ECFieldElement eCFieldElement4 = rawXCoord.Square();
ECFieldElement eCFieldElement5 = eCFieldElement4.Add(b);
ECFieldElement eCFieldElement6 = eCFieldElement3;
ECFieldElement eCFieldElement7 = eCFieldElement6.Square();
ECFieldElement eCFieldElement8 = eCFieldElement5.Add(eCFieldElement6);
ECFieldElement eCFieldElement9 = eCFieldElement8.MultiplyPlusProduct(eCFieldElement5, eCFieldElement7, curve.A);
ECFieldElement x2 = eCFieldElement6.Multiply(eCFieldElement9);
ECFieldElement y2 = eCFieldElement4.Square().MultiplyPlusProduct(eCFieldElement6, eCFieldElement9, eCFieldElement8);
ECFieldElement eCFieldElement10 = eCFieldElement6.Multiply(eCFieldElement7);
return(new F2mPoint(curve, x2, y2, new ECFieldElement[]
{
eCFieldElement10
}, base.IsCompressed));
}
default:
{
if (num != 6)
{
throw new InvalidOperationException("unsupported coordinate system");
}
ECFieldElement rawYCoord3 = base.RawYCoord;
ECFieldElement eCFieldElement11 = base.RawZCoords[0];
bool isOne2 = eCFieldElement11.IsOne;
ECFieldElement eCFieldElement12 = isOne2 ? rawYCoord3 : rawYCoord3.Multiply(eCFieldElement11);
ECFieldElement eCFieldElement13 = isOne2 ? eCFieldElement11 : eCFieldElement11.Square();
ECFieldElement a = curve.A;
ECFieldElement eCFieldElement14 = isOne2 ? a : a.Multiply(eCFieldElement13);
ECFieldElement eCFieldElement15 = rawYCoord3.Square().Add(eCFieldElement12).Add(eCFieldElement14);
if (eCFieldElement15.IsZero)
{
return(new F2mPoint(curve, eCFieldElement15, curve.B.Sqrt(), base.IsCompressed));
}
ECFieldElement eCFieldElement16 = eCFieldElement15.Square();
ECFieldElement eCFieldElement17 = isOne2 ? eCFieldElement15 : eCFieldElement15.Multiply(eCFieldElement13);
ECFieldElement b2 = curve.B;
ECFieldElement eCFieldElement19;
if (b2.BitLength < curve.FieldSize >> 1)
{
ECFieldElement eCFieldElement18 = rawYCoord3.Add(rawXCoord).Square();
ECFieldElement b3;
if (b2.IsOne)
{
b3 = eCFieldElement14.Add(eCFieldElement13).Square();
}
else
{
b3 = eCFieldElement14.SquarePlusProduct(b2, eCFieldElement13.Square());
}
eCFieldElement19 = eCFieldElement18.Add(eCFieldElement15).Add(eCFieldElement13).Multiply(eCFieldElement18).Add(b3).Add(eCFieldElement16);
if (a.IsZero)
{
eCFieldElement19 = eCFieldElement19.Add(eCFieldElement17);
}
else if (!a.IsOne)
{
eCFieldElement19 = eCFieldElement19.Add(a.AddOne().Multiply(eCFieldElement17));
}
}
else
{
ECFieldElement eCFieldElement20 = isOne2 ? rawXCoord : rawXCoord.Multiply(eCFieldElement11);
eCFieldElement19 = eCFieldElement20.SquarePlusProduct(eCFieldElement15, eCFieldElement12).Add(eCFieldElement16).Add(eCFieldElement17);
}
return(new F2mPoint(curve, eCFieldElement16, eCFieldElement19, new ECFieldElement[]
{
eCFieldElement17
}, base.IsCompressed));
}
}
}