public override ECPoint Twice()
{
if (base.IsInfinity)
{
return(this);
}
ECCurve curve = this.Curve;
SecP256R1FieldElement rawYCoord = (SecP256R1FieldElement)base.RawYCoord;
if (rawYCoord.IsZero)
{
return(curve.Infinity);
}
SecP256R1FieldElement rawXCoord = (SecP256R1FieldElement)base.RawXCoord;
SecP256R1FieldElement element3 = (SecP256R1FieldElement)base.RawZCoords[0];
uint[] z = Nat256.Create();
uint[] numArray2 = Nat256.Create();
uint[] numArray3 = Nat256.Create();
SecP256R1Field.Square(rawYCoord.x, numArray3);
uint[] numArray4 = Nat256.Create();
SecP256R1Field.Square(numArray3, numArray4);
bool isOne = element3.IsOne;
uint[] x = element3.x;
if (!isOne)
{
x = numArray2;
SecP256R1Field.Square(element3.x, x);
}
SecP256R1Field.Subtract(rawXCoord.x, x, z);
uint[] numArray6 = numArray2;
SecP256R1Field.Add(rawXCoord.x, x, numArray6);
SecP256R1Field.Multiply(numArray6, z, numArray6);
SecP256R1Field.Reduce32(Nat256.AddBothTo(numArray6, numArray6, numArray6), numArray6);
uint[] numArray7 = numArray3;
SecP256R1Field.Multiply(numArray3, rawXCoord.x, numArray7);
SecP256R1Field.Reduce32(Nat.ShiftUpBits(8, numArray7, 2, 0), numArray7);
SecP256R1Field.Reduce32(Nat.ShiftUpBits(8, numArray4, 3, 0, z), z);
SecP256R1FieldElement element4 = new SecP256R1FieldElement(numArray4);
SecP256R1Field.Square(numArray6, element4.x);
SecP256R1Field.Subtract(element4.x, numArray7, element4.x);
SecP256R1Field.Subtract(element4.x, numArray7, element4.x);
SecP256R1FieldElement y = new SecP256R1FieldElement(numArray7);
SecP256R1Field.Subtract(numArray7, element4.x, y.x);
SecP256R1Field.Multiply(y.x, numArray6, y.x);
SecP256R1Field.Subtract(y.x, z, y.x);
SecP256R1FieldElement element6 = new SecP256R1FieldElement(numArray6);
SecP256R1Field.Twice(rawYCoord.x, element6.x);
if (!isOne)
{
SecP256R1Field.Multiply(element6.x, element3.x, element6.x);
}
return(new SecP256R1Point(curve, element4, y, new ECFieldElement[] { element6 }, base.IsCompressed));
}
public override ECFieldElement Add(ECFieldElement b)
{
uint[] z = Nat256.Create();
SecP256R1Field.Add(x, ((SecP256R1FieldElement)b).x, z);
return(new SecP256R1FieldElement(z));
}
public override ECPoint Twice()
{
if (this.IsInfinity)
{
return(this);
}
ECCurve curve = this.Curve;
SecP256R1FieldElement Y1 = (SecP256R1FieldElement)this.RawYCoord;
if (Y1.IsZero)
{
return(curve.Infinity);
}
SecP256R1FieldElement X1 = (SecP256R1FieldElement)this.RawXCoord, Z1 = (SecP256R1FieldElement)this.RawZCoords[0];
uint c;
uint[] t1 = Nat256.Create();
uint[] t2 = Nat256.Create();
uint[] Y1Squared = Nat256.Create();
SecP256R1Field.Square(Y1.x, Y1Squared);
uint[] T = Nat256.Create();
SecP256R1Field.Square(Y1Squared, T);
bool Z1IsOne = Z1.IsOne;
uint[] Z1Squared = Z1.x;
if (!Z1IsOne)
{
Z1Squared = t2;
SecP256R1Field.Square(Z1.x, Z1Squared);
}
SecP256R1Field.Subtract(X1.x, Z1Squared, t1);
uint[] M = t2;
SecP256R1Field.Add(X1.x, Z1Squared, M);
SecP256R1Field.Multiply(M, t1, M);
c = Nat256.AddBothTo(M, M, M);
SecP256R1Field.Reduce32(c, M);
uint[] S = Y1Squared;
SecP256R1Field.Multiply(Y1Squared, X1.x, S);
c = Nat.ShiftUpBits(8, S, 2, 0);
SecP256R1Field.Reduce32(c, S);
c = Nat.ShiftUpBits(8, T, 3, 0, t1);
SecP256R1Field.Reduce32(c, t1);
SecP256R1FieldElement X3 = new SecP256R1FieldElement(T);
SecP256R1Field.Square(M, X3.x);
SecP256R1Field.Subtract(X3.x, S, X3.x);
SecP256R1Field.Subtract(X3.x, S, X3.x);
SecP256R1FieldElement Y3 = new SecP256R1FieldElement(S);
SecP256R1Field.Subtract(S, X3.x, Y3.x);
SecP256R1Field.Multiply(Y3.x, M, Y3.x);
SecP256R1Field.Subtract(Y3.x, t1, Y3.x);
SecP256R1FieldElement Z3 = new SecP256R1FieldElement(M);
SecP256R1Field.Twice(Y1.x, Z3.x);
if (!Z1IsOne)
{
SecP256R1Field.Multiply(Z3.x, Z1.x, Z3.x);
}
return(new SecP256R1Point(curve, X3, Y3, new ECFieldElement[] { Z3 }, IsCompressed));
}
public override ECPoint Twice()
{
if (base.IsInfinity)
{
return(this);
}
ECCurve curve = Curve;
SecP256R1FieldElement secP256R1FieldElement = (SecP256R1FieldElement)base.RawYCoord;
if (secP256R1FieldElement.IsZero)
{
return(curve.Infinity);
}
SecP256R1FieldElement secP256R1FieldElement2 = (SecP256R1FieldElement)base.RawXCoord;
SecP256R1FieldElement secP256R1FieldElement3 = (SecP256R1FieldElement)base.RawZCoords[0];
uint[] array = Nat256.Create();
uint[] array2 = Nat256.Create();
uint[] array3 = Nat256.Create();
SecP256R1Field.Square(secP256R1FieldElement.x, array3);
uint[] array4 = Nat256.Create();
SecP256R1Field.Square(array3, array4);
bool isOne = secP256R1FieldElement3.IsOne;
uint[] array5 = secP256R1FieldElement3.x;
if (!isOne)
{
array5 = array2;
SecP256R1Field.Square(secP256R1FieldElement3.x, array5);
}
SecP256R1Field.Subtract(secP256R1FieldElement2.x, array5, array);
uint[] array6 = array2;
SecP256R1Field.Add(secP256R1FieldElement2.x, array5, array6);
SecP256R1Field.Multiply(array6, array, array6);
uint x = Nat256.AddBothTo(array6, array6, array6);
SecP256R1Field.Reduce32(x, array6);
uint[] array7 = array3;
SecP256R1Field.Multiply(array3, secP256R1FieldElement2.x, array7);
x = Nat.ShiftUpBits(8, array7, 2, 0u);
SecP256R1Field.Reduce32(x, array7);
x = Nat.ShiftUpBits(8, array4, 3, 0u, array);
SecP256R1Field.Reduce32(x, array);
SecP256R1FieldElement secP256R1FieldElement4 = new SecP256R1FieldElement(array4);
SecP256R1Field.Square(array6, secP256R1FieldElement4.x);
SecP256R1Field.Subtract(secP256R1FieldElement4.x, array7, secP256R1FieldElement4.x);
SecP256R1Field.Subtract(secP256R1FieldElement4.x, array7, secP256R1FieldElement4.x);
SecP256R1FieldElement secP256R1FieldElement5 = new SecP256R1FieldElement(array7);
SecP256R1Field.Subtract(array7, secP256R1FieldElement4.x, secP256R1FieldElement5.x);
SecP256R1Field.Multiply(secP256R1FieldElement5.x, array6, secP256R1FieldElement5.x);
SecP256R1Field.Subtract(secP256R1FieldElement5.x, array, secP256R1FieldElement5.x);
SecP256R1FieldElement secP256R1FieldElement6 = new SecP256R1FieldElement(array6);
SecP256R1Field.Twice(secP256R1FieldElement.x, secP256R1FieldElement6.x);
if (!isOne)
{
SecP256R1Field.Multiply(secP256R1FieldElement6.x, secP256R1FieldElement3.x, secP256R1FieldElement6.x);
}
return(new SecP256R1Point(curve, secP256R1FieldElement4, secP256R1FieldElement5, new ECFieldElement[1] {
secP256R1FieldElement6
}, base.IsCompressed));
}
public override ECPoint Add(ECPoint b)
{
if (this.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
if (this == b)
{
return(Twice());
}
ECCurve curve = this.Curve;
SecP256R1FieldElement X1 = (SecP256R1FieldElement)this.RawXCoord, Y1 = (SecP256R1FieldElement)this.RawYCoord;
SecP256R1FieldElement X2 = (SecP256R1FieldElement)b.RawXCoord, Y2 = (SecP256R1FieldElement)b.RawYCoord;
SecP256R1FieldElement Z1 = (SecP256R1FieldElement)this.RawZCoords[0];
SecP256R1FieldElement Z2 = (SecP256R1FieldElement)b.RawZCoords[0];
uint[] tt1 = Nat256.CreateExt();
uint[] tt2 = Nat256.CreateExt();
uint[] t3 = Nat256.Create();
uint[] t4 = Nat256.Create();
bool Z1IsOne = Z1.IsOne;
uint[] U2, S2;
if (Z1IsOne)
{
U2 = X2.x;
S2 = Y2.x;
}
else
{
S2 = t3;
SecP256R1Field.Square(Z1.x, S2);
U2 = tt2;
SecP256R1Field.Multiply(S2, X2.x, U2);
SecP256R1Field.Multiply(S2, Z1.x, S2);
SecP256R1Field.Multiply(S2, Y2.x, S2);
}
bool Z2IsOne = Z2.IsOne;
uint[] U1, S1;
if (Z2IsOne)
{
U1 = X1.x;
S1 = Y1.x;
}
else
{
S1 = t4;
SecP256R1Field.Square(Z2.x, S1);
U1 = tt1;
SecP256R1Field.Multiply(S1, X1.x, U1);
SecP256R1Field.Multiply(S1, Z2.x, S1);
SecP256R1Field.Multiply(S1, Y1.x, S1);
}
uint[] H = Nat256.Create();
SecP256R1Field.Subtract(U1, U2, H);
uint[] R = tt2;
SecP256R1Field.Subtract(S1, S2, R);
// Check if b == this or b == -this
if (Nat256.IsZero(H))
{
if (Nat256.IsZero(R))
{
// this == b, i.e. this must be doubled
return(this.Twice());
}
// this == -b, i.e. the result is the point at infinity
return(curve.Infinity);
}
uint[] HSquared = t3;
SecP256R1Field.Square(H, HSquared);
uint[] G = Nat256.Create();
SecP256R1Field.Multiply(HSquared, H, G);
uint[] V = t3;
SecP256R1Field.Multiply(HSquared, U1, V);
Nat256.Mul(S1, G, tt1);
SecP256R1FieldElement X3 = new SecP256R1FieldElement(t4);
SecP256R1Field.Square(R, X3.x);
SecP256R1Field.Add(X3.x, G, X3.x);
SecP256R1Field.Subtract(X3.x, V, X3.x);
SecP256R1Field.Subtract(X3.x, V, X3.x);
SecP256R1FieldElement Y3 = new SecP256R1FieldElement(G);
SecP256R1Field.Subtract(V, X3.x, Y3.x);
Nat256.Mul(Y3.x, R, tt2);
SecP256R1Field.SubtractExt(tt2, tt1, tt2);
SecP256R1Field.Reduce(tt2, Y3.x);
SecP256R1FieldElement Z3 = new SecP256R1FieldElement(H);
if (!Z1IsOne)
{
SecP256R1Field.Multiply(Z3.x, Z1.x, Z3.x);
}
if (!Z2IsOne)
{
SecP256R1Field.Multiply(Z3.x, Z2.x, Z3.x);
}
ECFieldElement[] zs = new ECFieldElement[] { Z3 };
return(new SecP256R1Point(curve, X3, Y3, zs, IsCompressed));
}