def __add__(self, other):
"""Add two points on the same elliptic curve.
Args:
| self (fastecdsa.point.Point): a point :math:`P` on the curve
| other (fastecdsa.point.Point): a point :math:`Q` on the curve
Returns:
fastecdsa.point.Point: A point :math:`R` such that :math:`R = P + Q`
"""
if self.curve is not other.curve:
raise CurveMismatchError(self.curve, other.curve)
else:
x, y = curvemath.add(
str(self.x),
str(self.y),
str(other.x),
str(other.y),
str(self.curve.p),
str(self.curve.a),
str(self.curve.b),
str(self.curve.q),
str(self.curve.gx),
str(self.curve.gy)
)
return Point(int(x), int(y), self.curve)
def __add__(self, other):
"""Add two points on the same elliptic curve.
Args:
| self (:class:`Point`): a point :math:`P` on the curve
| other (:class:`Point`): a point :math:`Q` on the curve
Returns:
:class:`Point`: A point :math:`R` such that :math:`R = P + Q`
"""
validate_type(other, Point)
if self == self.IDENTITY_ELEMENT:
return other
elif other == self.IDENTITY_ELEMENT:
return self
elif self.curve is not other.curve:
raise CurveMismatchError(self.curve, other.curve)
elif self == -other:
return self.IDENTITY_ELEMENT
else:
x, y = curvemath.add(str(self.x), str(self.y), str(other.x),
str(other.y), str(self.curve.p),
str(self.curve.a), str(self.curve.b),
str(self.curve.q), str(self.curve.gx),
str(self.curve.gy))
return Point(int(x), int(y), self.curve)