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;
SecP160R2FieldElement X1 = (SecP160R2FieldElement)this.RawXCoord, Y1 = (SecP160R2FieldElement)this.RawYCoord;
SecP160R2FieldElement X2 = (SecP160R2FieldElement)b.RawXCoord, Y2 = (SecP160R2FieldElement)b.RawYCoord;
SecP160R2FieldElement Z1 = (SecP160R2FieldElement)this.RawZCoords[0];
SecP160R2FieldElement Z2 = (SecP160R2FieldElement)b.RawZCoords[0];
uint c;
uint[] tt1 = Nat160.CreateExt();
uint[] t2 = Nat160.Create();
uint[] t3 = Nat160.Create();
uint[] t4 = Nat160.Create();
bool Z1IsOne = Z1.IsOne;
uint[] U2, S2;
if (Z1IsOne)
{
U2 = X2.x;
S2 = Y2.x;
}
else
{
S2 = t3;
SecP160R2Field.Square(Z1.x, S2);
U2 = t2;
SecP160R2Field.Multiply(S2, X2.x, U2);
SecP160R2Field.Multiply(S2, Z1.x, S2);
SecP160R2Field.Multiply(S2, Y2.x, S2);
}
bool Z2IsOne = Z2.IsOne;
uint[] U1, S1;
if (Z2IsOne)
{
U1 = X1.x;
S1 = Y1.x;
}
else
{
S1 = t4;
SecP160R2Field.Square(Z2.x, S1);
U1 = tt1;
SecP160R2Field.Multiply(S1, X1.x, U1);
SecP160R2Field.Multiply(S1, Z2.x, S1);
SecP160R2Field.Multiply(S1, Y1.x, S1);
}
uint[] H = Nat160.Create();
SecP160R2Field.Subtract(U1, U2, H);
uint[] R = t2;
SecP160R2Field.Subtract(S1, S2, R);
// Check if b == this or b == -this
if (Nat160.IsZero(H))
{
if (Nat160.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;
SecP160R2Field.Square(H, HSquared);
uint[] G = Nat160.Create();
SecP160R2Field.Multiply(HSquared, H, G);
uint[] V = t3;
SecP160R2Field.Multiply(HSquared, U1, V);
SecP160R2Field.Negate(G, G);
Nat160.Mul(S1, G, tt1);
c = Nat160.AddBothTo(V, V, G);
SecP160R2Field.Reduce32(c, G);
SecP160R2FieldElement X3 = new SecP160R2FieldElement(t4);
SecP160R2Field.Square(R, X3.x);
SecP160R2Field.Subtract(X3.x, G, X3.x);
SecP160R2FieldElement Y3 = new SecP160R2FieldElement(G);
SecP160R2Field.Subtract(V, X3.x, Y3.x);
SecP160R2Field.MultiplyAddToExt(Y3.x, R, tt1);
SecP160R2Field.Reduce(tt1, Y3.x);
SecP160R2FieldElement Z3 = new SecP160R2FieldElement(H);
if (!Z1IsOne)
{
SecP160R2Field.Multiply(Z3.x, Z1.x, Z3.x);
}
if (!Z2IsOne)
{
SecP160R2Field.Multiply(Z3.x, Z2.x, Z3.x);
}
ECFieldElement[] zs = new ECFieldElement[]{ Z3 };
return new SecP160R2Point(curve, X3, Y3, zs, IsCompressed);
}
public override ECPoint Twice()
{
if (this.IsInfinity)
return this;
ECCurve curve = this.Curve;
SecP160R2FieldElement Y1 = (SecP160R2FieldElement)this.RawYCoord;
if (Y1.IsZero)
return curve.Infinity;
SecP160R2FieldElement X1 = (SecP160R2FieldElement)this.RawXCoord, Z1 = (SecP160R2FieldElement)this.RawZCoords[0];
uint c;
uint[] t1 = Nat160.Create();
uint[] t2 = Nat160.Create();
uint[] Y1Squared = Nat160.Create();
SecP160R2Field.Square(Y1.x, Y1Squared);
uint[] T = Nat160.Create();
SecP160R2Field.Square(Y1Squared, T);
bool Z1IsOne = Z1.IsOne;
uint[] Z1Squared = Z1.x;
if (!Z1IsOne)
{
Z1Squared = t2;
SecP160R2Field.Square(Z1.x, Z1Squared);
}
SecP160R2Field.Subtract(X1.x, Z1Squared, t1);
uint[] M = t2;
SecP160R2Field.Add(X1.x, Z1Squared, M);
SecP160R2Field.Multiply(M, t1, M);
c = Nat160.AddBothTo(M, M, M);
SecP160R2Field.Reduce32(c, M);
uint[] S = Y1Squared;
SecP160R2Field.Multiply(Y1Squared, X1.x, S);
c = Nat.ShiftUpBits(5, S, 2, 0);
SecP160R2Field.Reduce32(c, S);
c = Nat.ShiftUpBits(5, T, 3, 0, t1);
SecP160R2Field.Reduce32(c, t1);
SecP160R2FieldElement X3 = new SecP160R2FieldElement(T);
SecP160R2Field.Square(M, X3.x);
SecP160R2Field.Subtract(X3.x, S, X3.x);
SecP160R2Field.Subtract(X3.x, S, X3.x);
SecP160R2FieldElement Y3 = new SecP160R2FieldElement(S);
SecP160R2Field.Subtract(S, X3.x, Y3.x);
SecP160R2Field.Multiply(Y3.x, M, Y3.x);
SecP160R2Field.Subtract(Y3.x, t1, Y3.x);
SecP160R2FieldElement Z3 = new SecP160R2FieldElement(M);
SecP160R2Field.Twice(Y1.x, Z3.x);
if (!Z1IsOne)
{
SecP160R2Field.Multiply(Z3.x, Z1.x, Z3.x);
}
return new SecP160R2Point(curve, X3, Y3, new ECFieldElement[]{ Z3 }, IsCompressed);
}
public virtual bool Equals(SecP160R2FieldElement other)
{
if (this == other)
return true;
if (null == other)
return false;
return Nat160.Eq(x, other.x);
}
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;
SecP160R2FieldElement X1 = (SecP160R2FieldElement)this.RawXCoord, Y1 = (SecP160R2FieldElement)this.RawYCoord;
SecP160R2FieldElement X2 = (SecP160R2FieldElement)b.RawXCoord, Y2 = (SecP160R2FieldElement)b.RawYCoord;
SecP160R2FieldElement Z1 = (SecP160R2FieldElement)this.RawZCoords[0];
SecP160R2FieldElement Z2 = (SecP160R2FieldElement)b.RawZCoords[0];
uint c;
uint[] tt1 = Nat160.CreateExt();
uint[] t2 = Nat160.Create();
uint[] t3 = Nat160.Create();
uint[] t4 = Nat160.Create();
bool Z1IsOne = Z1.IsOne;
uint[] U2, S2;
if (Z1IsOne)
{
U2 = X2.x;
S2 = Y2.x;
}
else
{
S2 = t3;
SecP160R2Field.Square(Z1.x, S2);
U2 = t2;
SecP160R2Field.Multiply(S2, X2.x, U2);
SecP160R2Field.Multiply(S2, Z1.x, S2);
SecP160R2Field.Multiply(S2, Y2.x, S2);
}
bool Z2IsOne = Z2.IsOne;
uint[] U1, S1;
if (Z2IsOne)
{
U1 = X1.x;
S1 = Y1.x;
}
else
{
S1 = t4;
SecP160R2Field.Square(Z2.x, S1);
U1 = tt1;
SecP160R2Field.Multiply(S1, X1.x, U1);
SecP160R2Field.Multiply(S1, Z2.x, S1);
SecP160R2Field.Multiply(S1, Y1.x, S1);
}
uint[] H = Nat160.Create();
SecP160R2Field.Subtract(U1, U2, H);
uint[] R = t2;
SecP160R2Field.Subtract(S1, S2, R);
// Check if b == this or b == -this
if (Nat160.IsZero(H))
{
if (Nat160.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;
SecP160R2Field.Square(H, HSquared);
uint[] G = Nat160.Create();
SecP160R2Field.Multiply(HSquared, H, G);
uint[] V = t3;
SecP160R2Field.Multiply(HSquared, U1, V);
SecP160R2Field.Negate(G, G);
Nat160.Mul(S1, G, tt1);
c = Nat160.AddBothTo(V, V, G);
SecP160R2Field.Reduce32(c, G);
SecP160R2FieldElement X3 = new SecP160R2FieldElement(t4);
SecP160R2Field.Square(R, X3.x);
SecP160R2Field.Subtract(X3.x, G, X3.x);
SecP160R2FieldElement Y3 = new SecP160R2FieldElement(G);
SecP160R2Field.Subtract(V, X3.x, Y3.x);
SecP160R2Field.MultiplyAddToExt(Y3.x, R, tt1);
SecP160R2Field.Reduce(tt1, Y3.x);
SecP160R2FieldElement Z3 = new SecP160R2FieldElement(H);
if (!Z1IsOne)
{
SecP160R2Field.Multiply(Z3.x, Z1.x, Z3.x);
}
if (!Z2IsOne)
{
SecP160R2Field.Multiply(Z3.x, Z2.x, Z3.x);
}
ECFieldElement[] zs = new ECFieldElement[] { Z3 };
return(new SecP160R2Point(curve, X3, Y3, zs));
}
public override ECPoint Twice()
{
if (this.IsInfinity)
{
return(this);
}
ECCurve curve = this.Curve;
SecP160R2FieldElement Y1 = (SecP160R2FieldElement)this.RawYCoord;
if (Y1.IsZero)
{
return(curve.Infinity);
}
SecP160R2FieldElement X1 = (SecP160R2FieldElement)this.RawXCoord, Z1 = (SecP160R2FieldElement)this.RawZCoords[0];
uint c;
uint[] t1 = Nat160.Create();
uint[] t2 = Nat160.Create();
uint[] Y1Squared = Nat160.Create();
SecP160R2Field.Square(Y1.x, Y1Squared);
uint[] T = Nat160.Create();
SecP160R2Field.Square(Y1Squared, T);
bool Z1IsOne = Z1.IsOne;
uint[] Z1Squared = Z1.x;
if (!Z1IsOne)
{
Z1Squared = t2;
SecP160R2Field.Square(Z1.x, Z1Squared);
}
SecP160R2Field.Subtract(X1.x, Z1Squared, t1);
uint[] M = t2;
SecP160R2Field.Add(X1.x, Z1Squared, M);
SecP160R2Field.Multiply(M, t1, M);
c = Nat160.AddBothTo(M, M, M);
SecP160R2Field.Reduce32(c, M);
uint[] S = Y1Squared;
SecP160R2Field.Multiply(Y1Squared, X1.x, S);
c = Nat.ShiftUpBits(5, S, 2, 0);
SecP160R2Field.Reduce32(c, S);
c = Nat.ShiftUpBits(5, T, 3, 0, t1);
SecP160R2Field.Reduce32(c, t1);
SecP160R2FieldElement X3 = new SecP160R2FieldElement(T);
SecP160R2Field.Square(M, X3.x);
SecP160R2Field.Subtract(X3.x, S, X3.x);
SecP160R2Field.Subtract(X3.x, S, X3.x);
SecP160R2FieldElement Y3 = new SecP160R2FieldElement(S);
SecP160R2Field.Subtract(S, X3.x, Y3.x);
SecP160R2Field.Multiply(Y3.x, M, Y3.x);
SecP160R2Field.Subtract(Y3.x, t1, Y3.x);
SecP160R2FieldElement Z3 = new SecP160R2FieldElement(M);
SecP160R2Field.Twice(Y1.x, Z3.x);
if (!Z1IsOne)
{
SecP160R2Field.Multiply(Z3.x, Z1.x, Z3.x);
}
return(new SecP160R2Point(curve, X3, Y3, new ECFieldElement[] { Z3 }));
}
public override ECPoint Add(ECPoint b)
{
if (base.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
if (this == b)
{
return(Twice());
}
ECCurve curve = Curve;
SecP160R2FieldElement secP160R2FieldElement = (SecP160R2FieldElement)base.RawXCoord;
SecP160R2FieldElement secP160R2FieldElement2 = (SecP160R2FieldElement)base.RawYCoord;
SecP160R2FieldElement secP160R2FieldElement3 = (SecP160R2FieldElement)b.RawXCoord;
SecP160R2FieldElement secP160R2FieldElement4 = (SecP160R2FieldElement)b.RawYCoord;
SecP160R2FieldElement secP160R2FieldElement5 = (SecP160R2FieldElement)base.RawZCoords[0];
SecP160R2FieldElement secP160R2FieldElement6 = (SecP160R2FieldElement)b.RawZCoords[0];
uint[] array = Nat160.CreateExt();
uint[] array2 = Nat160.Create();
uint[] array3 = Nat160.Create();
uint[] array4 = Nat160.Create();
bool isOne = secP160R2FieldElement5.IsOne;
uint[] array5;
uint[] array6;
if (isOne)
{
array5 = secP160R2FieldElement3.x;
array6 = secP160R2FieldElement4.x;
}
else
{
array6 = array3;
SecP160R2Field.Square(secP160R2FieldElement5.x, array6);
array5 = array2;
SecP160R2Field.Multiply(array6, secP160R2FieldElement3.x, array5);
SecP160R2Field.Multiply(array6, secP160R2FieldElement5.x, array6);
SecP160R2Field.Multiply(array6, secP160R2FieldElement4.x, array6);
}
bool isOne2 = secP160R2FieldElement6.IsOne;
uint[] array7;
uint[] array8;
if (isOne2)
{
array7 = secP160R2FieldElement.x;
array8 = secP160R2FieldElement2.x;
}
else
{
array8 = array4;
SecP160R2Field.Square(secP160R2FieldElement6.x, array8);
array7 = array;
SecP160R2Field.Multiply(array8, secP160R2FieldElement.x, array7);
SecP160R2Field.Multiply(array8, secP160R2FieldElement6.x, array8);
SecP160R2Field.Multiply(array8, secP160R2FieldElement2.x, array8);
}
uint[] array9 = Nat160.Create();
SecP160R2Field.Subtract(array7, array5, array9);
uint[] array10 = array2;
SecP160R2Field.Subtract(array8, array6, array10);
if (Nat160.IsZero(array9))
{
if (Nat160.IsZero(array10))
{
return(Twice());
}
return(curve.Infinity);
}
uint[] array11 = array3;
SecP160R2Field.Square(array9, array11);
uint[] array12 = Nat160.Create();
SecP160R2Field.Multiply(array11, array9, array12);
uint[] array13 = array3;
SecP160R2Field.Multiply(array11, array7, array13);
SecP160R2Field.Negate(array12, array12);
Nat160.Mul(array8, array12, array);
uint x = Nat160.AddBothTo(array13, array13, array12);
SecP160R2Field.Reduce32(x, array12);
SecP160R2FieldElement secP160R2FieldElement7 = new SecP160R2FieldElement(array4);
SecP160R2Field.Square(array10, secP160R2FieldElement7.x);
SecP160R2Field.Subtract(secP160R2FieldElement7.x, array12, secP160R2FieldElement7.x);
SecP160R2FieldElement secP160R2FieldElement8 = new SecP160R2FieldElement(array12);
SecP160R2Field.Subtract(array13, secP160R2FieldElement7.x, secP160R2FieldElement8.x);
SecP160R2Field.MultiplyAddToExt(secP160R2FieldElement8.x, array10, array);
SecP160R2Field.Reduce(array, secP160R2FieldElement8.x);
SecP160R2FieldElement secP160R2FieldElement9 = new SecP160R2FieldElement(array9);
if (!isOne)
{
SecP160R2Field.Multiply(secP160R2FieldElement9.x, secP160R2FieldElement5.x, secP160R2FieldElement9.x);
}
if (!isOne2)
{
SecP160R2Field.Multiply(secP160R2FieldElement9.x, secP160R2FieldElement6.x, secP160R2FieldElement9.x);
}
ECFieldElement[] zs = new ECFieldElement[1]
{
secP160R2FieldElement9
};
return(new SecP160K1Point(curve, secP160R2FieldElement7, secP160R2FieldElement8, zs, base.IsCompressed));
}