|
public static CheckFieldElements ( |
||
| a | ||
| b | ||
| Résultat | void | |
/**
* @param curve base curve
* @param x x point
* @param y y point
* @param withCompression true if encode with point compression.
*/
public F2mPoint(
ECCurve curve,
ECFieldElement x,
ECFieldElement y,
bool withCompression)
: base(curve, x, y)
{
if ((x != null && y == null) || (x == null && y != null))
{
throw new ArgumentException("Exactly one of the field elements is null");
}
if (x != null)
{
// Check if x and y are elements of the same field
F2mFieldElement.CheckFieldElements(this.x, this.y);
if (curve != null)
{
// Check if x and a are elements of the same field
F2mFieldElement.CheckFieldElements(this.x, this.curve.A);
}
}
this.withCompression = withCompression;
}
public F2mPoint(ECCurve curve, ECFieldElement x, ECFieldElement y, bool withCompression) : base(curve, x, y, withCompression)
{
if ((x == null) != (y == null))
{
throw new ArgumentException("Exactly one of the field elements is null");
}
if (x != null)
{
F2mFieldElement.CheckFieldElements(x, y);
if (curve != null)
{
F2mFieldElement.CheckFieldElements(x, curve.A);
}
}
}
/* (non-Javadoc)
* @see Org.BouncyCastle.Math.EC.ECPoint#add(Org.BouncyCastle.Math.EC.ECPoint)
*/
public override ECPoint Add(
ECPoint b)
{
// Check, if points are on the same curve
if (!curve.Equals(b.Curve))
{
throw new ArgumentException("Only points on the same curve can be added");
}
if (this.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
F2mFieldElement.CheckFieldElements(this.x, b.X);
F2mFieldElement x2 = (F2mFieldElement)b.X;
F2mFieldElement y2 = (F2mFieldElement)b.Y;
// Check if b = this or b = -this
if (this.x.Equals(x2))
{
// this = b, i.e. this must be doubled
if (this.y.Equals(y2))
{
return(this.Twice());
}
// this = -b, i.e. the result is the point at infinity
return(this.curve.Infinity);
}
F2mFieldElement lambda
= (F2mFieldElement)(this.y.Add(y2)).Divide(this.x.Add(x2));
F2mFieldElement x3
= (F2mFieldElement)lambda.Square().Add(lambda).Add(this.x).Add(x2).Add(this.curve.A);
F2mFieldElement y3
= (F2mFieldElement)lambda.Multiply(this.x.Add(x3)).Add(x3).Add(this.y);
return(new F2mPoint(curve, x3, y3, withCompression));
}
public F2mPoint(ECCurve curve, ECFieldElement x, ECFieldElement y, bool withCompression)
: base(curve, x, y, withCompression)
{
//IL_001a: Unknown result type (might be due to invalid IL or missing references)
if (x == null != (y == null))
{
throw new ArgumentException("Exactly one of the field elements is null");
}
if (x != null)
{
F2mFieldElement.CheckFieldElements(x, y);
if (curve != null)
{
F2mFieldElement.CheckFieldElements(x, curve.A);
}
}
}
