public override ECPoint Add(ECPoint b)
{
if (base.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
if (this == b)
{
return(Twice());
}
ECCurve curve = Curve;
Curve25519FieldElement curve25519FieldElement = (Curve25519FieldElement)base.RawXCoord;
Curve25519FieldElement curve25519FieldElement2 = (Curve25519FieldElement)base.RawYCoord;
Curve25519FieldElement curve25519FieldElement3 = (Curve25519FieldElement)base.RawZCoords[0];
Curve25519FieldElement curve25519FieldElement4 = (Curve25519FieldElement)b.RawXCoord;
Curve25519FieldElement curve25519FieldElement5 = (Curve25519FieldElement)b.RawYCoord;
Curve25519FieldElement curve25519FieldElement6 = (Curve25519FieldElement)b.RawZCoords[0];
uint[] array = Nat256.CreateExt();
uint[] array2 = Nat256.Create();
uint[] array3 = Nat256.Create();
uint[] array4 = Nat256.Create();
bool isOne = curve25519FieldElement3.IsOne;
uint[] array5;
uint[] array6;
if (isOne)
{
array5 = curve25519FieldElement4.x;
array6 = curve25519FieldElement5.x;
}
else
{
array6 = array3;
Curve25519Field.Square(curve25519FieldElement3.x, array6);
array5 = array2;
Curve25519Field.Multiply(array6, curve25519FieldElement4.x, array5);
Curve25519Field.Multiply(array6, curve25519FieldElement3.x, array6);
Curve25519Field.Multiply(array6, curve25519FieldElement5.x, array6);
}
bool isOne2 = curve25519FieldElement6.IsOne;
uint[] array7;
uint[] array8;
if (isOne2)
{
array7 = curve25519FieldElement.x;
array8 = curve25519FieldElement2.x;
}
else
{
array8 = array4;
Curve25519Field.Square(curve25519FieldElement6.x, array8);
array7 = array;
Curve25519Field.Multiply(array8, curve25519FieldElement.x, array7);
Curve25519Field.Multiply(array8, curve25519FieldElement6.x, array8);
Curve25519Field.Multiply(array8, curve25519FieldElement2.x, array8);
}
uint[] array9 = Nat256.Create();
Curve25519Field.Subtract(array7, array5, array9);
uint[] array10 = array2;
Curve25519Field.Subtract(array8, array6, array10);
if (Nat256.IsZero(array9))
{
if (Nat256.IsZero(array10))
{
return(Twice());
}
return(curve.Infinity);
}
uint[] array11 = Nat256.Create();
Curve25519Field.Square(array9, array11);
uint[] array12 = Nat256.Create();
Curve25519Field.Multiply(array11, array9, array12);
uint[] array13 = array3;
Curve25519Field.Multiply(array11, array7, array13);
Curve25519Field.Negate(array12, array12);
Nat256.Mul(array8, array12, array);
uint x = Nat256.AddBothTo(array13, array13, array12);
Curve25519Field.Reduce27(x, array12);
Curve25519FieldElement curve25519FieldElement7 = new Curve25519FieldElement(array4);
Curve25519Field.Square(array10, curve25519FieldElement7.x);
Curve25519Field.Subtract(curve25519FieldElement7.x, array12, curve25519FieldElement7.x);
Curve25519FieldElement curve25519FieldElement8 = new Curve25519FieldElement(array12);
Curve25519Field.Subtract(array13, curve25519FieldElement7.x, curve25519FieldElement8.x);
Curve25519Field.MultiplyAddToExt(curve25519FieldElement8.x, array10, array);
Curve25519Field.Reduce(array, curve25519FieldElement8.x);
Curve25519FieldElement curve25519FieldElement9 = new Curve25519FieldElement(array9);
if (!isOne)
{
Curve25519Field.Multiply(curve25519FieldElement9.x, curve25519FieldElement3.x, curve25519FieldElement9.x);
}
if (!isOne2)
{
Curve25519Field.Multiply(curve25519FieldElement9.x, curve25519FieldElement6.x, curve25519FieldElement9.x);
}
uint[] zSquared = (isOne && isOne2) ? array11 : null;
Curve25519FieldElement curve25519FieldElement10 = CalculateJacobianModifiedW(curve25519FieldElement9, zSquared);
ECFieldElement[] zs = new ECFieldElement[2]
{
curve25519FieldElement9,
curve25519FieldElement10
};
return(new Curve25519Point(curve, curve25519FieldElement7, curve25519FieldElement8, zs, base.IsCompressed));
}
public override ECFieldElement Multiply(ECFieldElement b)
{
uint[] z = Nat256.Create();
Curve25519Field.Multiply(x, ((Curve25519FieldElement)b).x, z);
return(new Curve25519FieldElement(z));
}
public override ECFieldElement Negate()
{
uint[] z = Nat256.Create();
Curve25519Field.Negate(x, z);
return(new Curve25519FieldElement(z));
}
public override ECFieldElement Subtract(ECFieldElement b)
{
uint[] z = Nat256.Create();
Curve25519Field.Subtract(x, ((Curve25519FieldElement)b).x, z);
return(new Curve25519FieldElement(z));
}
