def normalize(self):
if self.z_coord == 0:
return self
else:
inv = inverse_mod(self.z_coord, self.ec.modulus)
x = (self.x_coord * inv) % self.ec.modulus
y = (self.y_coord * inv) % self.ec.modulus
return Point(x, y, 1, self.ec)
def test_inverse_mod(self):
self.assertEqual(inverse_mod(5, 13), 8)
self.assertEqual(inverse_mod(138, 7993), 6545)
