def test_affine(point_affine, nid, curve):
point = Point.from_affine(point_affine, curve=nid) # from nid
the_same_point = Point.from_affine(point_affine,
curve=curve) # from curve instance
assert point == the_same_point
assert isinstance(point, Point)
point_affine2 = point.to_affine()
assert point_affine == point_affine2
def test_coords_with_special_characteristics():
# Testing that a point with x coordinate greater than the curve order is still valid.
# In particular, we will test the last valid point from the default curve (secp256k1)
# whose x coordinate is `field_order - 3` and is greater than the order of the curve
field_order = 2**256 - 0x1000003D1
compressed = b'\x02' + (field_order - 3).to_bytes(32, 'big')
last_point = Point.from_bytes(compressed)
# The same point, but obtained through the from_affine method
coords = (
115792089237316195423570985008687907853269984665640564039457584007908834671660,
109188863561374057667848968960504138135859662956057034999983532397866404169138
)
assert last_point == Point.from_affine(coords)
def test_affine(point_affine, nid, curve):
point = Point.from_affine(point_affine, curve=curve) # from curve
assert isinstance(point, Point)
point_affine2 = point.to_affine()
assert point_affine == point_affine2