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 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)); }