public override ECPoint Twice() { if (base.IsInfinity) { return(this); } ECCurve curve = this.Curve; SecP256K1FieldElement secP256K1FieldElement = (SecP256K1FieldElement)base.RawYCoord; if (secP256K1FieldElement.IsZero) { return(curve.Infinity); } SecP256K1FieldElement secP256K1FieldElement2 = (SecP256K1FieldElement)base.RawXCoord; SecP256K1FieldElement secP256K1FieldElement3 = (SecP256K1FieldElement)base.RawZCoords[0]; uint[] array = Nat256.Create(); SecP256K1Field.Square(secP256K1FieldElement.x, array); uint[] array2 = Nat256.Create(); SecP256K1Field.Square(array, array2); uint[] array3 = Nat256.Create(); SecP256K1Field.Square(secP256K1FieldElement2.x, array3); uint x = Nat256.AddBothTo(array3, array3, array3); SecP256K1Field.Reduce32(x, array3); uint[] array4 = array; SecP256K1Field.Multiply(array, secP256K1FieldElement2.x, array4); x = Nat.ShiftUpBits(8, array4, 2, 0u); SecP256K1Field.Reduce32(x, array4); uint[] array5 = Nat256.Create(); x = Nat.ShiftUpBits(8, array2, 3, 0u, array5); SecP256K1Field.Reduce32(x, array5); SecP256K1FieldElement secP256K1FieldElement4 = new SecP256K1FieldElement(array2); SecP256K1Field.Square(array3, secP256K1FieldElement4.x); SecP256K1Field.Subtract(secP256K1FieldElement4.x, array4, secP256K1FieldElement4.x); SecP256K1Field.Subtract(secP256K1FieldElement4.x, array4, secP256K1FieldElement4.x); SecP256K1FieldElement secP256K1FieldElement5 = new SecP256K1FieldElement(array4); SecP256K1Field.Subtract(array4, secP256K1FieldElement4.x, secP256K1FieldElement5.x); SecP256K1Field.Multiply(secP256K1FieldElement5.x, array3, secP256K1FieldElement5.x); SecP256K1Field.Subtract(secP256K1FieldElement5.x, array5, secP256K1FieldElement5.x); SecP256K1FieldElement secP256K1FieldElement6 = new SecP256K1FieldElement(array3); SecP256K1Field.Twice(secP256K1FieldElement.x, secP256K1FieldElement6.x); if (!secP256K1FieldElement3.IsOne) { SecP256K1Field.Multiply(secP256K1FieldElement6.x, secP256K1FieldElement3.x, secP256K1FieldElement6.x); } return(new SecP256K1Point(curve, secP256K1FieldElement4, secP256K1FieldElement5, new ECFieldElement[] { secP256K1FieldElement6 }, base.IsCompressed)); }
public override ECPoint Twice() { if (base.IsInfinity) { return(this); } ECCurve curve = this.Curve; SecP256K1FieldElement rawYCoord = (SecP256K1FieldElement)base.RawYCoord; if (rawYCoord.IsZero) { return(curve.Infinity); } SecP256K1FieldElement rawXCoord = (SecP256K1FieldElement)base.RawXCoord; SecP256K1FieldElement element3 = (SecP256K1FieldElement)base.RawZCoords[0]; uint[] z = Nat256.Create(); SecP256K1Field.Square(rawYCoord.x, z); uint[] numArray2 = Nat256.Create(); SecP256K1Field.Square(z, numArray2); uint[] numArray3 = Nat256.Create(); SecP256K1Field.Square(rawXCoord.x, numArray3); SecP256K1Field.Reduce32(Nat256.AddBothTo(numArray3, numArray3, numArray3), numArray3); uint[] numArray4 = z; SecP256K1Field.Multiply(z, rawXCoord.x, numArray4); SecP256K1Field.Reduce32(Nat.ShiftUpBits(8, numArray4, 2, 0), numArray4); uint[] numArray5 = Nat256.Create(); SecP256K1Field.Reduce32(Nat.ShiftUpBits(8, numArray2, 3, 0, numArray5), numArray5); SecP256K1FieldElement x = new SecP256K1FieldElement(numArray2); SecP256K1Field.Square(numArray3, x.x); SecP256K1Field.Subtract(x.x, numArray4, x.x); SecP256K1Field.Subtract(x.x, numArray4, x.x); SecP256K1FieldElement y = new SecP256K1FieldElement(numArray4); SecP256K1Field.Subtract(numArray4, x.x, y.x); SecP256K1Field.Multiply(y.x, numArray3, y.x); SecP256K1Field.Subtract(y.x, numArray5, y.x); SecP256K1FieldElement element6 = new SecP256K1FieldElement(numArray3); SecP256K1Field.Twice(rawYCoord.x, element6.x); if (!element3.IsOne) { SecP256K1Field.Multiply(element6.x, element3.x, element6.x); } return(new SecP256K1Point(curve, x, y, new ECFieldElement[] { element6 }, base.IsCompressed)); }
public override ECPoint Twice() { if (this.IsInfinity) { return(this); } ECCurve curve = this.Curve; SecP256K1FieldElement Y1 = (SecP256K1FieldElement)this.RawYCoord; if (Y1.IsZero) { return(curve.Infinity); } SecP256K1FieldElement X1 = (SecP256K1FieldElement)this.RawXCoord, Z1 = (SecP256K1FieldElement)this.RawZCoords[0]; uint c; uint[] Y1Squared = Nat256.Create(); SecP256K1Field.Square(Y1.x, Y1Squared); uint[] T = Nat256.Create(); SecP256K1Field.Square(Y1Squared, T); uint[] M = Nat256.Create(); SecP256K1Field.Square(X1.x, M); c = Nat256.AddBothTo(M, M, M); SecP256K1Field.Reduce32(c, M); uint[] S = Y1Squared; SecP256K1Field.Multiply(Y1Squared, X1.x, S); c = Nat.ShiftUpBits(8, S, 2, 0); SecP256K1Field.Reduce32(c, S); uint[] t1 = Nat256.Create(); c = Nat.ShiftUpBits(8, T, 3, 0, t1); SecP256K1Field.Reduce32(c, t1); SecP256K1FieldElement X3 = new SecP256K1FieldElement(T); SecP256K1Field.Square(M, X3.x); SecP256K1Field.Subtract(X3.x, S, X3.x); SecP256K1Field.Subtract(X3.x, S, X3.x); SecP256K1FieldElement Y3 = new SecP256K1FieldElement(S); SecP256K1Field.Subtract(S, X3.x, Y3.x); SecP256K1Field.Multiply(Y3.x, M, Y3.x); SecP256K1Field.Subtract(Y3.x, t1, Y3.x); SecP256K1FieldElement Z3 = new SecP256K1FieldElement(M); SecP256K1Field.Twice(Y1.x, Z3.x); if (!Z1.IsOne) { SecP256K1Field.Multiply(Z3.x, Z1.x, Z3.x); } return(new SecP256K1Point(curve, X3, Y3, new ECFieldElement[] { Z3 }, IsCompressed)); }