public virtual AbstractF2mPoint TauPow(int pow)
{
//IL_00bc: Unknown result type (might be due to invalid IL or missing references)
if (base.IsInfinity)
{
return(this);
}
ECCurve curve = Curve;
int coordinateSystem = curve.CoordinateSystem;
ECFieldElement rawXCoord = base.RawXCoord;
switch (coordinateSystem)
{
case 0:
case 5:
{
ECFieldElement rawYCoord2 = base.RawYCoord;
return((AbstractF2mPoint)curve.CreateRawPoint(rawXCoord.SquarePow(pow), rawYCoord2.SquarePow(pow), base.IsCompressed));
}
case 1:
case 6:
{
ECFieldElement rawYCoord = base.RawYCoord;
ECFieldElement eCFieldElement = base.RawZCoords[0];
return((AbstractF2mPoint)curve.CreateRawPoint(rawXCoord.SquarePow(pow), rawYCoord.SquarePow(pow), new ECFieldElement[1] {
eCFieldElement.SquarePow(pow)
}, base.IsCompressed));
}
default:
throw new InvalidOperationException("unsupported coordinate system");
}
}
public virtual AbstractF2mPoint TauPow(int pow)
{
if (base.IsInfinity)
{
return(this);
}
ECCurve curve = this.Curve;
int coordinateSystem = curve.CoordinateSystem;
ECFieldElement rawXCoord = base.RawXCoord;
switch (coordinateSystem)
{
case 0:
case 5:
{
ECFieldElement rawYCoord = base.RawYCoord;
return((AbstractF2mPoint)curve.CreateRawPoint(rawXCoord.SquarePow(pow), rawYCoord.SquarePow(pow), base.IsCompressed));
}
case 1:
case 6:
{
ECFieldElement rawYCoord2 = base.RawYCoord;
ECFieldElement eCFieldElement = base.RawZCoords[0];
return((AbstractF2mPoint)curve.CreateRawPoint(rawXCoord.SquarePow(pow), rawYCoord2.SquarePow(pow), new ECFieldElement[]
{
eCFieldElement.SquarePow(pow)
}, base.IsCompressed));
}
}
throw new InvalidOperationException("unsupported coordinate system");
}
public virtual ECFieldElement HalfTrace()
{
int m = FieldSize;
if ((m & 1) == 0)
{
throw new InvalidOperationException("Half-trace only defined for odd m");
}
//ECFieldElement ht = this;
//for (int i = 1; i < m; i += 2)
//{
// ht = ht.SquarePow(2).Add(this);
//}
int n = (m + 1) >> 1;
int k = 31 - Integers.NumberOfLeadingZeros(n);
int nk = 1;
ECFieldElement ht = this;
while (k > 0)
{
ht = ht.SquarePow(nk << 1).Add(ht);
nk = n >> --k;
if (0 != (nk & 1))
{
ht = ht.SquarePow(2).Add(this);
}
}
return(ht);
}
public virtual int Trace()
{
int m = FieldSize;
//ECFieldElement tr = this;
//for (int i = 1; i < m; ++i)
//{
// tr = tr.Square().Add(this);
//}
int k = 31 - Integers.NumberOfLeadingZeros(m);
int mk = 1;
ECFieldElement tr = this;
while (k > 0)
{
tr = tr.SquarePow(mk).Add(tr);
mk = m >> --k;
if (0 != (mk & 1))
{
tr = tr.Square().Add(this);
}
}
if (tr.IsZero)
{
return(0);
}
if (tr.IsOne)
{
return(1);
}
throw new InvalidOperationException("Internal error in trace calculation");
}
public virtual ECFieldElement HalfTrace()
{
int m = FieldSize;
if ((m & 1) == 0)
{
throw new InvalidOperationException("Half-trace only defined for odd m");
}
ECFieldElement fe = this;
ECFieldElement ht = fe;
for (int i = 2; i < m; i += 2)
{
fe = fe.SquarePow(2);
ht = ht.Add(fe);
}
return(ht);
}
