using Org.BouncyCastle.Math.Raw; namespace Org.BouncyCastle.Math.EC.Custom.GM { internal class SM2P256V1Point : AbstractFpPoint { internal SM2P256V1Point(ECCurve curve, ECFieldElement x, ECFieldElement y) : base(curve, x, y) { } internal SM2P256V1Point(ECCurve curve, ECFieldElement x, ECFieldElement y, ECFieldElement[] zs) : base(curve, x, y, zs) { } protected override ECPoint Detach() { return new SM2P256V1Point(null, AffineXCoord, AffineYCoord); } public override ECPoint Add(ECPoint b) { if (base.IsInfinity) return b; if (b.IsInfinity) return this; if (this == b) return Twice(); ECCurve curve = Curve; SM2P256V1FieldElement sM2P256V1FieldElement = (SM2P256V1FieldElement)base.RawXCoord; SM2P256V1FieldElement sM2P256V1FieldElement2 = (SM2P256V1FieldElement)base.RawYCoord; SM2P256V1FieldElement sM2P256V1FieldElement3 = (SM2P256V1FieldElement)b.RawXCoord; SM2P256V1FieldElement sM2P256V1FieldElement4 = (SM2P256V1FieldElement)b.RawYCoord; SM2P256V1FieldElement sM2P256V1FieldElement5 = (SM2P256V1FieldElement)base.RawZCoords[0]; SM2P256V1FieldElement sM2P256V1FieldElement6 = (SM2P256V1FieldElement)b.RawZCoords[0]; uint[] array = Nat256.CreateExt(); uint[] array2 = Nat256.Create(); uint[] array3 = Nat256.Create(); uint[] array4 = Nat256.Create(); bool isOne = sM2P256V1FieldElement5.IsOne; uint[] array5; uint[] array6; if (isOne) { array5 = sM2P256V1FieldElement3.x; array6 = sM2P256V1FieldElement4.x; } else { array6 = array3; SM2P256V1Field.Square(sM2P256V1FieldElement5.x, array6); array5 = array2; SM2P256V1Field.Multiply(array6, sM2P256V1FieldElement3.x, array5); SM2P256V1Field.Multiply(array6, sM2P256V1FieldElement5.x, array6); SM2P256V1Field.Multiply(array6, sM2P256V1FieldElement4.x, array6); } bool isOne2 = sM2P256V1FieldElement6.IsOne; uint[] array7; uint[] array8; if (isOne2) { array7 = sM2P256V1FieldElement.x; array8 = sM2P256V1FieldElement2.x; } else { array8 = array4; SM2P256V1Field.Square(sM2P256V1FieldElement6.x, array8); array7 = array; SM2P256V1Field.Multiply(array8, sM2P256V1FieldElement.x, array7); SM2P256V1Field.Multiply(array8, sM2P256V1FieldElement6.x, array8); SM2P256V1Field.Multiply(array8, sM2P256V1FieldElement2.x, array8); } uint[] array9 = Nat256.Create(); SM2P256V1Field.Subtract(array7, array5, array9); uint[] array10 = array2; SM2P256V1Field.Subtract(array8, array6, array10); if (Nat256.IsZero(array9)) { if (Nat256.IsZero(array10)) return Twice(); return curve.Infinity; } uint[] array11 = array3; SM2P256V1Field.Square(array9, array11); uint[] array12 = Nat256.Create(); SM2P256V1Field.Multiply(array11, array9, array12); uint[] array13 = array3; SM2P256V1Field.Multiply(array11, array7, array13); SM2P256V1Field.Negate(array12, array12); Nat256.Mul(array8, array12, array); SM2P256V1Field.Reduce32(Nat256.AddBothTo(array13, array13, array12), array12); SM2P256V1FieldElement sM2P256V1FieldElement7 = new SM2P256V1FieldElement(array4); SM2P256V1Field.Square(array10, sM2P256V1FieldElement7.x); SM2P256V1Field.Subtract(sM2P256V1FieldElement7.x, array12, sM2P256V1FieldElement7.x); SM2P256V1FieldElement sM2P256V1FieldElement8 = new SM2P256V1FieldElement(array12); SM2P256V1Field.Subtract(array13, sM2P256V1FieldElement7.x, sM2P256V1FieldElement8.x); SM2P256V1Field.MultiplyAddToExt(sM2P256V1FieldElement8.x, array10, array); SM2P256V1Field.Reduce(array, sM2P256V1FieldElement8.x); SM2P256V1FieldElement sM2P256V1FieldElement9 = new SM2P256V1FieldElement(array9); if (!isOne) SM2P256V1Field.Multiply(sM2P256V1FieldElement9.x, sM2P256V1FieldElement5.x, sM2P256V1FieldElement9.x); if (!isOne2) SM2P256V1Field.Multiply(sM2P256V1FieldElement9.x, sM2P256V1FieldElement6.x, sM2P256V1FieldElement9.x); ECFieldElement[] zs = new ECFieldElement[1] { sM2P256V1FieldElement9 }; return new SM2P256V1Point(curve, sM2P256V1FieldElement7, sM2P256V1FieldElement8, zs); } public override ECPoint Twice() { if (base.IsInfinity) return this; ECCurve curve = Curve; SM2P256V1FieldElement sM2P256V1FieldElement = (SM2P256V1FieldElement)base.RawYCoord; if (sM2P256V1FieldElement.IsZero) return curve.Infinity; SM2P256V1FieldElement sM2P256V1FieldElement2 = (SM2P256V1FieldElement)base.RawXCoord; SM2P256V1FieldElement sM2P256V1FieldElement3 = (SM2P256V1FieldElement)base.RawZCoords[0]; uint[] array = Nat256.Create(); uint[] array2 = Nat256.Create(); uint[] array3 = Nat256.Create(); SM2P256V1Field.Square(sM2P256V1FieldElement.x, array3); uint[] array4 = Nat256.Create(); SM2P256V1Field.Square(array3, array4); bool isOne = sM2P256V1FieldElement3.IsOne; uint[] array5 = sM2P256V1FieldElement3.x; if (!isOne) { array5 = array2; SM2P256V1Field.Square(sM2P256V1FieldElement3.x, array5); } SM2P256V1Field.Subtract(sM2P256V1FieldElement2.x, array5, array); uint[] array6 = array2; SM2P256V1Field.Add(sM2P256V1FieldElement2.x, array5, array6); SM2P256V1Field.Multiply(array6, array, array6); SM2P256V1Field.Reduce32(Nat256.AddBothTo(array6, array6, array6), array6); uint[] array7 = array3; SM2P256V1Field.Multiply(array3, sM2P256V1FieldElement2.x, array7); SM2P256V1Field.Reduce32(Nat.ShiftUpBits(8, array7, 2, 0), array7); SM2P256V1Field.Reduce32(Nat.ShiftUpBits(8, array4, 3, 0, array), array); SM2P256V1FieldElement sM2P256V1FieldElement4 = new SM2P256V1FieldElement(array4); SM2P256V1Field.Square(array6, sM2P256V1FieldElement4.x); SM2P256V1Field.Subtract(sM2P256V1FieldElement4.x, array7, sM2P256V1FieldElement4.x); SM2P256V1Field.Subtract(sM2P256V1FieldElement4.x, array7, sM2P256V1FieldElement4.x); SM2P256V1FieldElement sM2P256V1FieldElement5 = new SM2P256V1FieldElement(array7); SM2P256V1Field.Subtract(array7, sM2P256V1FieldElement4.x, sM2P256V1FieldElement5.x); SM2P256V1Field.Multiply(sM2P256V1FieldElement5.x, array6, sM2P256V1FieldElement5.x); SM2P256V1Field.Subtract(sM2P256V1FieldElement5.x, array, sM2P256V1FieldElement5.x); SM2P256V1FieldElement sM2P256V1FieldElement6 = new SM2P256V1FieldElement(array6); SM2P256V1Field.Twice(sM2P256V1FieldElement.x, sM2P256V1FieldElement6.x); if (!isOne) SM2P256V1Field.Multiply(sM2P256V1FieldElement6.x, sM2P256V1FieldElement3.x, sM2P256V1FieldElement6.x); return new SM2P256V1Point(curve, sM2P256V1FieldElement4, sM2P256V1FieldElement5, new ECFieldElement[1] { sM2P256V1FieldElement6 }); } public override ECPoint TwicePlus(ECPoint b) { if (this == b) return ThreeTimes(); if (base.IsInfinity) return b; if (b.IsInfinity) return Twice(); if (base.RawYCoord.IsZero) return b; return Twice().Add(b); } public override ECPoint ThreeTimes() { if (base.IsInfinity || base.RawYCoord.IsZero) return this; return Twice().Add(this); } public override ECPoint Negate() { if (base.IsInfinity) return this; return new SM2P256V1Point(Curve, base.RawXCoord, base.RawYCoord.Negate(), base.RawZCoords); } } }