SecT193R1Point
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecT193R1Point : AbstractF2mPoint
{
public override ECFieldElement YCoord {
get {
ECFieldElement rawXCoord = base.RawXCoord;
ECFieldElement rawYCoord = base.RawYCoord;
if (base.IsInfinity || rawXCoord.IsZero)
return rawYCoord;
ECFieldElement eCFieldElement = rawYCoord.Add(rawXCoord).Multiply(rawXCoord);
ECFieldElement eCFieldElement2 = base.RawZCoords[0];
if (!eCFieldElement2.IsOne)
eCFieldElement = eCFieldElement.Divide(eCFieldElement2);
return eCFieldElement;
}
}
protected internal override bool CompressionYTilde {
get {
ECFieldElement rawXCoord = base.RawXCoord;
if (rawXCoord.IsZero)
return false;
return base.RawYCoord.TestBitZero() != rawXCoord.TestBitZero();
}
}
internal SecT193R1Point(ECCurve curve, ECFieldElement x, ECFieldElement y)
: base(curve, x, y)
{
}
internal SecT193R1Point(ECCurve curve, ECFieldElement x, ECFieldElement y, ECFieldElement[] zs)
: base(curve, x, y, zs)
{
}
protected override ECPoint Detach()
{
return new SecT193R1Point(null, AffineXCoord, AffineYCoord);
}
public override ECPoint Add(ECPoint b)
{
if (base.IsInfinity)
return b;
if (b.IsInfinity)
return this;
ECCurve curve = Curve;
ECFieldElement rawXCoord = base.RawXCoord;
ECFieldElement rawXCoord2 = b.RawXCoord;
if (rawXCoord.IsZero) {
if (rawXCoord2.IsZero)
return curve.Infinity;
return b.Add(this);
}
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement eCFieldElement = base.RawZCoords[0];
ECFieldElement rawYCoord2 = b.RawYCoord;
ECFieldElement eCFieldElement2 = b.RawZCoords[0];
bool isOne = eCFieldElement.IsOne;
ECFieldElement eCFieldElement3 = rawXCoord2;
ECFieldElement eCFieldElement4 = rawYCoord2;
if (!isOne) {
eCFieldElement3 = eCFieldElement3.Multiply(eCFieldElement);
eCFieldElement4 = eCFieldElement4.Multiply(eCFieldElement);
}
bool isOne2 = eCFieldElement2.IsOne;
ECFieldElement eCFieldElement5 = rawXCoord;
ECFieldElement eCFieldElement6 = rawYCoord;
if (!isOne2) {
eCFieldElement5 = eCFieldElement5.Multiply(eCFieldElement2);
eCFieldElement6 = eCFieldElement6.Multiply(eCFieldElement2);
}
ECFieldElement eCFieldElement7 = eCFieldElement6.Add(eCFieldElement4);
ECFieldElement eCFieldElement8 = eCFieldElement5.Add(eCFieldElement3);
if (eCFieldElement8.IsZero) {
if (eCFieldElement7.IsZero)
return Twice();
return curve.Infinity;
}
ECFieldElement eCFieldElement10;
ECFieldElement y;
ECFieldElement eCFieldElement11;
if (rawXCoord2.IsZero) {
ECPoint eCPoint = Normalize();
rawXCoord = eCPoint.XCoord;
ECFieldElement yCoord = eCPoint.YCoord;
ECFieldElement b2 = rawYCoord2;
ECFieldElement eCFieldElement9 = yCoord.Add(b2).Divide(rawXCoord);
eCFieldElement10 = eCFieldElement9.Square().Add(eCFieldElement9).Add(rawXCoord)
.Add(curve.A);
if (eCFieldElement10.IsZero)
return new SecT193R1Point(curve, eCFieldElement10, curve.B.Sqrt());
y = eCFieldElement9.Multiply(rawXCoord.Add(eCFieldElement10)).Add(eCFieldElement10).Add(yCoord)
.Divide(eCFieldElement10)
.Add(eCFieldElement10);
eCFieldElement11 = curve.FromBigInteger(BigInteger.One);
} else {
eCFieldElement8 = eCFieldElement8.Square();
ECFieldElement eCFieldElement12 = eCFieldElement7.Multiply(eCFieldElement5);
ECFieldElement eCFieldElement13 = eCFieldElement7.Multiply(eCFieldElement3);
eCFieldElement10 = eCFieldElement12.Multiply(eCFieldElement13);
if (eCFieldElement10.IsZero)
return new SecT193R1Point(curve, eCFieldElement10, curve.B.Sqrt());
ECFieldElement eCFieldElement14 = eCFieldElement7.Multiply(eCFieldElement8);
if (!isOne2)
eCFieldElement14 = eCFieldElement14.Multiply(eCFieldElement2);
y = eCFieldElement13.Add(eCFieldElement8).SquarePlusProduct(eCFieldElement14, rawYCoord.Add(eCFieldElement));
eCFieldElement11 = eCFieldElement14;
if (!isOne)
eCFieldElement11 = eCFieldElement11.Multiply(eCFieldElement);
}
return new SecT193R1Point(curve, eCFieldElement10, y, new ECFieldElement[1] {
eCFieldElement11
});
}
public override ECPoint Twice()
{
if (base.IsInfinity)
return this;
ECCurve curve = Curve;
ECFieldElement rawXCoord = base.RawXCoord;
if (rawXCoord.IsZero)
return curve.Infinity;
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement eCFieldElement = base.RawZCoords[0];
bool isOne = eCFieldElement.IsOne;
ECFieldElement eCFieldElement2 = isOne ? rawYCoord : rawYCoord.Multiply(eCFieldElement);
ECFieldElement b = isOne ? eCFieldElement : eCFieldElement.Square();
ECFieldElement a = curve.A;
ECFieldElement b2 = isOne ? a : a.Multiply(b);
ECFieldElement eCFieldElement3 = rawYCoord.Square().Add(eCFieldElement2).Add(b2);
if (eCFieldElement3.IsZero)
return new SecT193R1Point(curve, eCFieldElement3, curve.B.Sqrt());
ECFieldElement eCFieldElement4 = eCFieldElement3.Square();
ECFieldElement eCFieldElement5 = isOne ? eCFieldElement3 : eCFieldElement3.Multiply(b);
ECFieldElement y = (isOne ? rawXCoord : rawXCoord.Multiply(eCFieldElement)).SquarePlusProduct(eCFieldElement3, eCFieldElement2).Add(eCFieldElement4).Add(eCFieldElement5);
return new SecT193R1Point(curve, eCFieldElement4, y, new ECFieldElement[1] {
eCFieldElement5
});
}
public override ECPoint TwicePlus(ECPoint b)
{
if (base.IsInfinity)
return b;
if (b.IsInfinity)
return Twice();
ECCurve curve = Curve;
ECFieldElement rawXCoord = base.RawXCoord;
if (rawXCoord.IsZero)
return b;
ECFieldElement rawXCoord2 = b.RawXCoord;
ECFieldElement eCFieldElement = b.RawZCoords[0];
if (rawXCoord2.IsZero || !eCFieldElement.IsOne)
return Twice().Add(b);
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement eCFieldElement2 = base.RawZCoords[0];
ECFieldElement rawYCoord2 = b.RawYCoord;
ECFieldElement x = rawXCoord.Square();
ECFieldElement b2 = rawYCoord.Square();
ECFieldElement eCFieldElement3 = eCFieldElement2.Square();
ECFieldElement b3 = rawYCoord.Multiply(eCFieldElement2);
ECFieldElement b4 = curve.A.Multiply(eCFieldElement3).Add(b2).Add(b3);
ECFieldElement eCFieldElement4 = rawYCoord2.AddOne();
ECFieldElement eCFieldElement5 = curve.A.Add(eCFieldElement4).Multiply(eCFieldElement3).Add(b2)
.MultiplyPlusProduct(b4, x, eCFieldElement3);
ECFieldElement eCFieldElement6 = rawXCoord2.Multiply(eCFieldElement3);
ECFieldElement eCFieldElement7 = eCFieldElement6.Add(b4).Square();
if (eCFieldElement7.IsZero) {
if (eCFieldElement5.IsZero)
return b.Twice();
return curve.Infinity;
}
if (eCFieldElement5.IsZero)
return new SecT193R1Point(curve, eCFieldElement5, curve.B.Sqrt());
ECFieldElement x2 = eCFieldElement5.Square().Multiply(eCFieldElement6);
ECFieldElement eCFieldElement8 = eCFieldElement5.Multiply(eCFieldElement7).Multiply(eCFieldElement3);
ECFieldElement y = eCFieldElement5.Add(eCFieldElement7).Square().MultiplyPlusProduct(b4, eCFieldElement4, eCFieldElement8);
return new SecT193R1Point(curve, x2, y, new ECFieldElement[1] {
eCFieldElement8
});
}
public override ECPoint Negate()
{
if (base.IsInfinity)
return this;
ECFieldElement rawXCoord = base.RawXCoord;
if (rawXCoord.IsZero)
return this;
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement eCFieldElement = base.RawZCoords[0];
return new SecT193R1Point(Curve, rawXCoord, rawYCoord.Add(eCFieldElement), new ECFieldElement[1] {
eCFieldElement
});
}
}
}