protected virtual BigInteger ModInverse(BigInteger x)
{
int bits = FieldSize;
int len = (bits + 31) >> 5;
uint[] p = Nat.FromBigInteger(bits, q);
uint[] n = Nat.FromBigInteger(bits, x);
uint[] z = Nat.Create(len);
Mod.Invert(p, n, z);
return(Nat.ToBigInteger(len, z));
}
public static void SquareN(uint[] x, int n, uint[] z)
{
uint[] array = Nat.Create(24);
Nat384.Square(x, array);
Reduce(array, z);
while (--n > 0)
{
Nat384.Square(z, array);
Reduce(array, z);
}
}
public static void SquareN(uint[] x, int n, uint[] z)
{
uint[] array = Nat.Create(33);
ImplSquare(x, array);
Reduce(array, z);
while (--n > 0)
{
ImplSquare(z, array);
Reduce(array, z);
}
}
public static void SquareN(uint[] x, int n, uint[] z)
{
uint[] array = Nat.Create(33);
SecP521R1Field.ImplSquare(x, array);
SecP521R1Field.Reduce(array, z);
while (--n > 0)
{
SecP521R1Field.ImplSquare(z, array);
SecP521R1Field.Reduce(array, z);
}
}
protected virtual BigInteger ModInverse(BigInteger x)
{
var bits = this.FieldSize;
var len = (bits + 31) >> 5;
var p = Nat.FromBigInteger(bits, this.Q);
var n = Nat.FromBigInteger(bits, x);
var z = Nat.Create(len);
Mod.Invert(p, n, z);
return(Nat.ToBigInteger(len, z));
}
public static void SquareN(uint[] x, int n, uint[] z)
{
uint[] zz = Nat.Create(0x18);
Nat384.Square(x, zz);
Reduce(zz, z);
while (--n > 0)
{
Nat384.Square(z, zz);
Reduce(zz, z);
}
}
public static void SquareN(uint[] x, int n, uint[] z)
{
Debug.Assert(n > 0);
uint[] tt = Nat.Create(33);
ImplSquare(x, tt);
Reduce(tt, z);
while (--n > 0)
{
ImplSquare(z, tt);
Reduce(tt, z);
}
}
public override ECPoint LookupVar(int index)
{
uint[] x = Nat.Create(SECP521R1_FE_INTS), y = Nat.Create(SECP521R1_FE_INTS);
int pos = index * SECP521R1_FE_INTS * 2;
for (int j = 0; j < SECP521R1_FE_INTS; ++j)
{
x[j] = m_table[pos + j];
y[j] = m_table[pos + SECP521R1_FE_INTS + j];
}
return(CreatePoint(x, y));
}
public override ECFieldElement Sqrt()
{
uint[] array = x;
if (Nat.IsZero(17, array) || Nat.IsOne(17, array))
{
return(this);
}
uint[] z = Nat.Create(17);
uint[] array2 = Nat.Create(17);
SecP521R1Field.SquareN(array, 519, z);
SecP521R1Field.Square(z, array2);
return((!Nat.Eq(17, array, array2)) ? null : new SecP521R1FieldElement(z));
}
public override ECFieldElement Sqrt()
{
uint[] x = this.x;
if (Nat.IsZero(0x11, x) || Nat.IsOne(0x11, x))
{
return(this);
}
uint[] z = Nat.Create(0x11);
uint[] numArray3 = Nat.Create(0x11);
SecP521R1Field.SquareN(x, 0x207, z);
SecP521R1Field.Square(z, numArray3);
return(!Nat.Eq(0x11, x, numArray3) ? null : new SecP521R1FieldElement(z));
}
public override ECFieldElement Sqrt()
{
uint[] y = this.x;
if (Nat.IsZero(12, y) || Nat.IsOne(12, y))
{
return(this);
}
uint[] array = Nat.Create(12);
uint[] array2 = Nat.Create(12);
uint[] array3 = Nat.Create(12);
uint[] array4 = Nat.Create(12);
SecP384R1Field.Square(y, array);
SecP384R1Field.Multiply(array, y, array);
SecP384R1Field.SquareN(array, 2, array2);
SecP384R1Field.Multiply(array2, array, array2);
SecP384R1Field.Square(array2, array2);
SecP384R1Field.Multiply(array2, y, array2);
SecP384R1Field.SquareN(array2, 5, array3);
SecP384R1Field.Multiply(array3, array2, array3);
SecP384R1Field.SquareN(array3, 5, array4);
SecP384R1Field.Multiply(array4, array2, array4);
SecP384R1Field.SquareN(array4, 15, array2);
SecP384R1Field.Multiply(array2, array4, array2);
SecP384R1Field.SquareN(array2, 2, array3);
SecP384R1Field.Multiply(array, array3, array);
SecP384R1Field.SquareN(array3, 28, array3);
SecP384R1Field.Multiply(array2, array3, array2);
SecP384R1Field.SquareN(array2, 60, array3);
SecP384R1Field.Multiply(array3, array2, array3);
uint[] z = array2;
SecP384R1Field.SquareN(array3, 120, z);
SecP384R1Field.Multiply(z, array3, z);
SecP384R1Field.SquareN(z, 15, z);
SecP384R1Field.Multiply(z, array4, z);
SecP384R1Field.SquareN(z, 33, z);
SecP384R1Field.Multiply(z, array, z);
SecP384R1Field.SquareN(z, 64, z);
SecP384R1Field.Multiply(z, y, z);
SecP384R1Field.SquareN(z, 30, array);
SecP384R1Field.Square(array, array2);
if (!Nat.Eq(12, y, array2))
{
return(null);
}
return(new SecP384R1FieldElement(array));
}
/**
* return a sqrt root - the routine verifies that the calculation returns the right value - if
* none exists it returns null.
*/
public override ECFieldElement Sqrt()
{
// Raise this element to the exponent 2^519
uint[] x1 = this.x;
if (Nat.IsZero(17, x1) || Nat.IsOne(17, x1))
{
return(this);
}
uint[] t1 = Nat.Create(17);
uint[] t2 = Nat.Create(17);
SecP521R1Field.SquareN(x1, 519, t1);
SecP521R1Field.Square(t1, t2);
return(Nat.Eq(17, x1, t2) ? new SecP521R1FieldElement(t1) : null);
}
public override ECFieldElement Sqrt()
{
uint[] x = this.x;
if (Nat.IsZero(12, x) || Nat.IsOne(12, x))
{
return(this);
}
uint[] z = Nat.Create(12);
uint[] numArray3 = Nat.Create(12);
uint[] numArray4 = Nat.Create(12);
uint[] numArray5 = Nat.Create(12);
SecP384R1Field.Square(x, z);
SecP384R1Field.Multiply(z, x, z);
SecP384R1Field.SquareN(z, 2, numArray3);
SecP384R1Field.Multiply(numArray3, z, numArray3);
SecP384R1Field.Square(numArray3, numArray3);
SecP384R1Field.Multiply(numArray3, x, numArray3);
SecP384R1Field.SquareN(numArray3, 5, numArray4);
SecP384R1Field.Multiply(numArray4, numArray3, numArray4);
SecP384R1Field.SquareN(numArray4, 5, numArray5);
SecP384R1Field.Multiply(numArray5, numArray3, numArray5);
SecP384R1Field.SquareN(numArray5, 15, numArray3);
SecP384R1Field.Multiply(numArray3, numArray5, numArray3);
SecP384R1Field.SquareN(numArray3, 2, numArray4);
SecP384R1Field.Multiply(z, numArray4, z);
SecP384R1Field.SquareN(numArray4, 0x1c, numArray4);
SecP384R1Field.Multiply(numArray3, numArray4, numArray3);
SecP384R1Field.SquareN(numArray3, 60, numArray4);
SecP384R1Field.Multiply(numArray4, numArray3, numArray4);
uint[] numArray6 = numArray3;
SecP384R1Field.SquareN(numArray4, 120, numArray6);
SecP384R1Field.Multiply(numArray6, numArray4, numArray6);
SecP384R1Field.SquareN(numArray6, 15, numArray6);
SecP384R1Field.Multiply(numArray6, numArray5, numArray6);
SecP384R1Field.SquareN(numArray6, 0x21, numArray6);
SecP384R1Field.Multiply(numArray6, z, numArray6);
SecP384R1Field.SquareN(numArray6, 0x40, numArray6);
SecP384R1Field.Multiply(numArray6, x, numArray6);
SecP384R1Field.SquareN(numArray6, 30, z);
SecP384R1Field.Square(z, numArray3);
return(!Nat.Eq(12, x, numArray3) ? null : new SecP384R1FieldElement(z));
}
public virtual ECPoint Lookup(int index)
{
uint[] x = Nat.Create(SECP521R1_FE_INTS), y = Nat.Create(SECP521R1_FE_INTS);
int pos = 0;
for (int i = 0; i < m_size; ++i)
{
uint MASK = (uint)(((i ^ index) - 1) >> 31);
for (int j = 0; j < SECP521R1_FE_INTS; ++j)
{
x[j] ^= m_table[pos + j] & MASK;
y[j] ^= m_table[pos + SECP521R1_FE_INTS + j] & MASK;
}
pos += (SECP521R1_FE_INTS * 2);
}
return(m_outer.CreateRawPoint(new SecP521R1FieldElement(x), new SecP521R1FieldElement(y), false));
}
public override ECPoint Lookup(int index)
{
uint[] x = Nat.Create(SECP521R1_FE_INTS), y = Nat.Create(SECP521R1_FE_INTS);
int pos = 0;
for (int i = 0; i < m_size; ++i)
{
uint MASK = (uint)(((i ^ index) - 1) >> 31);
for (int j = 0; j < SECP521R1_FE_INTS; ++j)
{
x[j] ^= m_table[pos + j] & MASK;
y[j] ^= m_table[pos + SECP521R1_FE_INTS + j] & MASK;
}
pos += (SECP521R1_FE_INTS * 2);
}
return(CreatePoint(x, y));
}
public static BigInteger ModOddInverseVar(BigInteger M, BigInteger X)
{
if (!M.TestBit(0))
{
throw new ArgumentException("must be odd", "M");
}
if (M.SignValue != 1)
{
throw new ArithmeticException("BigInteger: modulus not positive");
}
if (M.Equals(One))
{
return(Zero);
}
if (X.SignValue < 0 || X.CompareTo(M) >= 0)
{
X = X.Mod(M);
}
if (X.Equals(One))
{
return(One);
}
int bits = M.BitLength;
uint[] m = Nat.FromBigInteger(bits, M);
uint[] x = Nat.FromBigInteger(bits, X);
int len = m.Length;
uint[] z = Nat.Create(len);
if (!Mod.ModOddInverseVar(m, x, z))
{
throw new ArithmeticException("BigInteger not invertible");
}
return(Nat.ToBigInteger(len, z));
}
/**
* return a sqrt root - the routine verifies that the calculation returns the right value - if
* none exists it returns null.
*/
public override ECFieldElement Sqrt()
{
// Raise this element to the exponent 2^382 - 2^126 - 2^94 + 2^30
uint[] x1 = this.x;
if (Nat.IsZero(12, x1) || Nat.IsOne(12, x1))
{
return(this);
}
uint[] t1 = Nat.Create(12);
uint[] t2 = Nat.Create(12);
uint[] t3 = Nat.Create(12);
uint[] t4 = Nat.Create(12);
SecP384R1Field.Square(x1, t1);
SecP384R1Field.Multiply(t1, x1, t1);
SecP384R1Field.SquareN(t1, 2, t2);
SecP384R1Field.Multiply(t2, t1, t2);
SecP384R1Field.Square(t2, t2);
SecP384R1Field.Multiply(t2, x1, t2);
SecP384R1Field.SquareN(t2, 5, t3);
SecP384R1Field.Multiply(t3, t2, t3);
SecP384R1Field.SquareN(t3, 5, t4);
SecP384R1Field.Multiply(t4, t2, t4);
SecP384R1Field.SquareN(t4, 15, t2);
SecP384R1Field.Multiply(t2, t4, t2);
SecP384R1Field.SquareN(t2, 2, t3);
SecP384R1Field.Multiply(t1, t3, t1);
SecP384R1Field.SquareN(t3, 28, t3);
SecP384R1Field.Multiply(t2, t3, t2);
SecP384R1Field.SquareN(t2, 60, t3);
SecP384R1Field.Multiply(t3, t2, t3);
uint[] r = t2;
SecP384R1Field.SquareN(t3, 120, r);
SecP384R1Field.Multiply(r, t3, r);
SecP384R1Field.SquareN(r, 15, r);
SecP384R1Field.Multiply(r, t4, r);
SecP384R1Field.SquareN(r, 33, r);
SecP384R1Field.Multiply(r, t1, r);
SecP384R1Field.SquareN(r, 64, r);
SecP384R1Field.Multiply(r, x1, r);
SecP384R1Field.SquareN(r, 30, t1);
SecP384R1Field.Square(t1, t2);
return(Nat.Eq(12, x1, t2) ? new SecP384R1FieldElement(t1) : null);
}
public static void Multiply(uint[] x, uint[] y, uint[] z)
{
uint[] zz = Nat.Create(0x21);
ImplMultiply(x, y, zz);
Reduce(zz, z);
}
public static void Square(uint[] x, uint[] z)
{
uint[] zz = Nat.Create(0x21);
ImplSquare(x, zz);
Reduce(zz, z);
}
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;
SecP384R1FieldElement X1 = (SecP384R1FieldElement)this.RawXCoord, Y1 = (SecP384R1FieldElement)this.RawYCoord;
SecP384R1FieldElement X2 = (SecP384R1FieldElement)b.RawXCoord, Y2 = (SecP384R1FieldElement)b.RawYCoord;
SecP384R1FieldElement Z1 = (SecP384R1FieldElement)this.RawZCoords[0];
SecP384R1FieldElement Z2 = (SecP384R1FieldElement)b.RawZCoords[0];
uint c;
uint[] tt1 = Nat.Create(24);
uint[] tt2 = Nat.Create(24);
uint[] t3 = Nat.Create(12);
uint[] t4 = Nat.Create(12);
bool Z1IsOne = Z1.IsOne;
uint[] U2, S2;
if (Z1IsOne)
{
U2 = X2.x;
S2 = Y2.x;
}
else
{
S2 = t3;
SecP384R1Field.Square(Z1.x, S2);
U2 = tt2;
SecP384R1Field.Multiply(S2, X2.x, U2);
SecP384R1Field.Multiply(S2, Z1.x, S2);
SecP384R1Field.Multiply(S2, Y2.x, S2);
}
bool Z2IsOne = Z2.IsOne;
uint[] U1, S1;
if (Z2IsOne)
{
U1 = X1.x;
S1 = Y1.x;
}
else
{
S1 = t4;
SecP384R1Field.Square(Z2.x, S1);
U1 = tt1;
SecP384R1Field.Multiply(S1, X1.x, U1);
SecP384R1Field.Multiply(S1, Z2.x, S1);
SecP384R1Field.Multiply(S1, Y1.x, S1);
}
uint[] H = Nat.Create(12);
SecP384R1Field.Subtract(U1, U2, H);
uint[] R = Nat.Create(12);
SecP384R1Field.Subtract(S1, S2, R);
// Check if b == this or b == -this
if (Nat.IsZero(12, H))
{
if (Nat.IsZero(12, 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;
SecP384R1Field.Square(H, HSquared);
uint[] G = Nat.Create(12);
SecP384R1Field.Multiply(HSquared, H, G);
uint[] V = t3;
SecP384R1Field.Multiply(HSquared, U1, V);
SecP384R1Field.Negate(G, G);
Nat384.Mul(S1, G, tt1);
c = Nat.AddBothTo(12, V, V, G);
SecP384R1Field.Reduce32(c, G);
SecP384R1FieldElement X3 = new SecP384R1FieldElement(t4);
SecP384R1Field.Square(R, X3.x);
SecP384R1Field.Subtract(X3.x, G, X3.x);
SecP384R1FieldElement Y3 = new SecP384R1FieldElement(G);
SecP384R1Field.Subtract(V, X3.x, Y3.x);
Nat384.Mul(Y3.x, R, tt2);
SecP384R1Field.AddExt(tt1, tt2, tt1);
SecP384R1Field.Reduce(tt1, Y3.x);
SecP384R1FieldElement Z3 = new SecP384R1FieldElement(H);
if (!Z1IsOne)
{
SecP384R1Field.Multiply(Z3.x, Z1.x, Z3.x);
}
if (!Z2IsOne)
{
SecP384R1Field.Multiply(Z3.x, Z2.x, Z3.x);
}
ECFieldElement[] zs = new ECFieldElement[] { Z3 };
return new SecP384R1Point(curve, X3, Y3, zs, IsCompressed);
}
public override ECPoint Twice()
{
if (this.IsInfinity)
return this;
ECCurve curve = this.Curve;
SecP384R1FieldElement Y1 = (SecP384R1FieldElement)this.RawYCoord;
if (Y1.IsZero)
return curve.Infinity;
SecP384R1FieldElement X1 = (SecP384R1FieldElement)this.RawXCoord, Z1 = (SecP384R1FieldElement)this.RawZCoords[0];
uint c;
uint[] t1 = Nat.Create(12);
uint[] t2 = Nat.Create(12);
uint[] Y1Squared = Nat.Create(12);
SecP384R1Field.Square(Y1.x, Y1Squared);
uint[] T = Nat.Create(12);
SecP384R1Field.Square(Y1Squared, T);
bool Z1IsOne = Z1.IsOne;
uint[] Z1Squared = Z1.x;
if (!Z1IsOne)
{
Z1Squared = t2;
SecP384R1Field.Square(Z1.x, Z1Squared);
}
SecP384R1Field.Subtract(X1.x, Z1Squared, t1);
uint[] M = t2;
SecP384R1Field.Add(X1.x, Z1Squared, M);
SecP384R1Field.Multiply(M, t1, M);
c = Nat.AddBothTo(12, M, M, M);
SecP384R1Field.Reduce32(c, M);
uint[] S = Y1Squared;
SecP384R1Field.Multiply(Y1Squared, X1.x, S);
c = Nat.ShiftUpBits(12, S, 2, 0);
SecP384R1Field.Reduce32(c, S);
c = Nat.ShiftUpBits(12, T, 3, 0, t1);
SecP384R1Field.Reduce32(c, t1);
SecP384R1FieldElement X3 = new SecP384R1FieldElement(T);
SecP384R1Field.Square(M, X3.x);
SecP384R1Field.Subtract(X3.x, S, X3.x);
SecP384R1Field.Subtract(X3.x, S, X3.x);
SecP384R1FieldElement Y3 = new SecP384R1FieldElement(S);
SecP384R1Field.Subtract(S, X3.x, Y3.x);
SecP384R1Field.Multiply(Y3.x, M, Y3.x);
SecP384R1Field.Subtract(Y3.x, t1, Y3.x);
SecP384R1FieldElement Z3 = new SecP384R1FieldElement(M);
SecP384R1Field.Twice(Y1.x, Z3.x);
if (!Z1IsOne)
{
SecP384R1Field.Multiply(Z3.x, Z1.x, Z3.x);
}
return new SecP384R1Point(curve, X3, Y3, new ECFieldElement[] { Z3 }, IsCompressed);
}
public static void Multiply(uint[] x, uint[] y, uint[] z)
{
uint[] array = Nat.Create(33);
ImplMultiply(x, y, array);
Reduce(array, z);
}
public static void Square(uint[] x, uint[] z)
{
uint[] array = Nat.Create(33);
ImplSquare(x, array);
Reduce(array, z);
}
public override ECPoint Add(ECPoint b)
{
uint[] numArray5;
uint[] numArray6;
uint[] numArray7;
uint[] numArray8;
if (base.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
if (this == b)
{
return(this.Twice());
}
ECCurve curve = this.Curve;
SecP521R1FieldElement rawXCoord = (SecP521R1FieldElement)base.RawXCoord;
SecP521R1FieldElement rawYCoord = (SecP521R1FieldElement)base.RawYCoord;
SecP521R1FieldElement element3 = (SecP521R1FieldElement)b.RawXCoord;
SecP521R1FieldElement element4 = (SecP521R1FieldElement)b.RawYCoord;
SecP521R1FieldElement element5 = (SecP521R1FieldElement)base.RawZCoords[0];
SecP521R1FieldElement element6 = (SecP521R1FieldElement)b.RawZCoords[0];
uint[] z = Nat.Create(0x11);
uint[] numArray2 = Nat.Create(0x11);
uint[] numArray3 = Nat.Create(0x11);
uint[] x = Nat.Create(0x11);
bool isOne = element5.IsOne;
if (isOne)
{
numArray5 = element3.x;
numArray6 = element4.x;
}
else
{
numArray6 = numArray3;
SecP521R1Field.Square(element5.x, numArray6);
numArray5 = numArray2;
SecP521R1Field.Multiply(numArray6, element3.x, numArray5);
SecP521R1Field.Multiply(numArray6, element5.x, numArray6);
SecP521R1Field.Multiply(numArray6, element4.x, numArray6);
}
bool flag2 = element6.IsOne;
if (flag2)
{
numArray7 = rawXCoord.x;
numArray8 = rawYCoord.x;
}
else
{
numArray8 = x;
SecP521R1Field.Square(element6.x, numArray8);
numArray7 = z;
SecP521R1Field.Multiply(numArray8, rawXCoord.x, numArray7);
SecP521R1Field.Multiply(numArray8, element6.x, numArray8);
SecP521R1Field.Multiply(numArray8, rawYCoord.x, numArray8);
}
uint[] numArray9 = Nat.Create(0x11);
SecP521R1Field.Subtract(numArray7, numArray5, numArray9);
uint[] numArray10 = numArray2;
SecP521R1Field.Subtract(numArray8, numArray6, numArray10);
if (Nat.IsZero(0x11, numArray9))
{
if (Nat.IsZero(0x11, numArray10))
{
return(this.Twice());
}
return(curve.Infinity);
}
uint[] numArray11 = numArray3;
SecP521R1Field.Square(numArray9, numArray11);
uint[] numArray12 = Nat.Create(0x11);
SecP521R1Field.Multiply(numArray11, numArray9, numArray12);
uint[] numArray13 = numArray3;
SecP521R1Field.Multiply(numArray11, numArray7, numArray13);
SecP521R1Field.Multiply(numArray8, numArray12, z);
SecP521R1FieldElement element7 = new SecP521R1FieldElement(x);
SecP521R1Field.Square(numArray10, element7.x);
SecP521R1Field.Add(element7.x, numArray12, element7.x);
SecP521R1Field.Subtract(element7.x, numArray13, element7.x);
SecP521R1Field.Subtract(element7.x, numArray13, element7.x);
SecP521R1FieldElement y = new SecP521R1FieldElement(numArray12);
SecP521R1Field.Subtract(numArray13, element7.x, y.x);
SecP521R1Field.Multiply(y.x, numArray10, numArray2);
SecP521R1Field.Subtract(numArray2, z, y.x);
SecP521R1FieldElement element9 = new SecP521R1FieldElement(numArray9);
if (!isOne)
{
SecP521R1Field.Multiply(element9.x, element5.x, element9.x);
}
if (!flag2)
{
SecP521R1Field.Multiply(element9.x, element6.x, element9.x);
}
ECFieldElement[] zs = new ECFieldElement[] { element9 };
return(new SecP521R1Point(curve, element7, y, zs, base.IsCompressed));
}
public override ECFieldElement Subtract(ECFieldElement b)
{
uint[] z = Nat.Create(12);
SecP384R1Field.Subtract(x, ((SecP384R1FieldElement)b).x, z);
return(new SecP384R1FieldElement(z));
}
public SecP384R1FieldElement()
{
this.x = Nat.Create(12);
}
public override ECFieldElement AddOne()
{
uint[] z = Nat.Create(12);
SecP384R1Field.AddOne(x, z);
return(new SecP384R1FieldElement(z));
}
public override ECFieldElement Add(ECFieldElement b)
{
uint[] z = Nat.Create(12);
SecP384R1Field.Add(this.x, ((SecP384R1FieldElement)b).x, z);
return(new SecP384R1FieldElement(z));
}
public override ECFieldElement Multiply(ECFieldElement b)
{
uint[] z = Nat.Create(12);
SecP384R1Field.Multiply(x, ((SecP384R1FieldElement)b).x, z);
return(new SecP384R1FieldElement(z));
}
public override ECPoint Twice()
{
if (base.IsInfinity)
{
return(this);
}
ECCurve curve = this.Curve;
SecP521R1FieldElement rawYCoord = (SecP521R1FieldElement)base.RawYCoord;
if (rawYCoord.IsZero)
{
return(curve.Infinity);
}
SecP521R1FieldElement rawXCoord = (SecP521R1FieldElement)base.RawXCoord;
SecP521R1FieldElement element3 = (SecP521R1FieldElement)base.RawZCoords[0];
uint[] z = Nat.Create(0x11);
uint[] numArray2 = Nat.Create(0x11);
uint[] numArray3 = Nat.Create(0x11);
SecP521R1Field.Square(rawYCoord.x, numArray3);
uint[] numArray4 = Nat.Create(0x11);
SecP521R1Field.Square(numArray3, numArray4);
bool isOne = element3.IsOne;
uint[] x = element3.x;
if (!isOne)
{
x = numArray2;
SecP521R1Field.Square(element3.x, x);
}
SecP521R1Field.Subtract(rawXCoord.x, x, z);
uint[] numArray6 = numArray2;
SecP521R1Field.Add(rawXCoord.x, x, numArray6);
SecP521R1Field.Multiply(numArray6, z, numArray6);
Nat.AddBothTo(0x11, numArray6, numArray6, numArray6);
SecP521R1Field.Reduce23(numArray6);
uint[] numArray7 = numArray3;
SecP521R1Field.Multiply(numArray3, rawXCoord.x, numArray7);
Nat.ShiftUpBits(0x11, numArray7, 2, 0);
SecP521R1Field.Reduce23(numArray7);
Nat.ShiftUpBits(0x11, numArray4, 3, 0, z);
SecP521R1Field.Reduce23(z);
SecP521R1FieldElement element4 = new SecP521R1FieldElement(numArray4);
SecP521R1Field.Square(numArray6, element4.x);
SecP521R1Field.Subtract(element4.x, numArray7, element4.x);
SecP521R1Field.Subtract(element4.x, numArray7, element4.x);
SecP521R1FieldElement y = new SecP521R1FieldElement(numArray7);
SecP521R1Field.Subtract(numArray7, element4.x, y.x);
SecP521R1Field.Multiply(y.x, numArray6, y.x);
SecP521R1Field.Subtract(y.x, z, y.x);
SecP521R1FieldElement element6 = new SecP521R1FieldElement(numArray6);
SecP521R1Field.Twice(rawYCoord.x, element6.x);
if (!isOne)
{
SecP521R1Field.Multiply(element6.x, element3.x, element6.x);
}
return(new SecP521R1Point(curve, element4, y, new ECFieldElement[] { element6 }, base.IsCompressed));
}
