from unittest import TestCase

from pyecsca.ec.params import get_params


class FormulaTests(TestCase):

    def setUp(self):
        self.secp128r1 = get_params("secg", "secp128r1", "projective")
        self.add = self.secp128r1.curve.coordinate_model.formulas["add-2007-bl"]

    def test_wrong_call(self):
        with self.assertRaises(ValueError):
            self.add()
        with self.assertRaises(ValueError):
            self.add(self.secp128r1.generator.to_affine(), self.secp128r1.generator.to_affine())

    def test_indices(self):
        self.assertEqual(self.add.input_index, 1)
        self.assertEqual(self.add.output_index, 3)

    def test_inputs_outputs(self):
        self.assertEqual(self.add.inputs, {"X1", "Y1", "Z1", "X2", "Y2", "Z2"})
        self.assertEqual(self.add.outputs, {"X3", "Y3", "Z3"})

    def test_num_ops(self):
        self.assertEqual(self.add.num_operations, 33)
        self.assertEqual(self.add.num_multiplications, 17)
        self.assertEqual(self.add.num_divisions, 0)
        self.assertEqual(self.add.num_inversions, 0)
        self.assertEqual(self.add.num_powers, 0)
        self.assertEqual(self.add.num_squarings, 6)
        self.assertEqual(self.add.num_addsubs, 10)