python-optimus/tests/test-optimus.py at main · mpcabd/python-optimus · GitHub

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import itertools
import unittest
import secrets
import pathlib

import optimus_ids


class TestOptimus(unittest.TestCase):

    def test_mod_inverse(self):
        self.assertEqual(
            optimus_ids.mod_inverse(309779747, optimus_ids.MAX_32_INT),
            49560203
        )

    def test_validation(self):
        with self.assertRaises(ValueError):
            o = optimus_ids.Optimus(prime=5, bitlength=16)

        with self.assertRaises(ValueError):
            o = optimus_ids.generate(bitlength=16)

        with self.assertRaises(ValueError):
            optimus_ids.generate(path_to_primes='invalid-path')

    def test_generation(self):
        path = pathlib.Path('optimus-primes')
        if not (path.exists() and path.is_dir()):
            self.skipTest('optimus-primes not available for generation')

        o64 = optimus_ids.generate()
        o32 = optimus_ids.generate(bitlength=32)

        self.assertEqual(o64.decode(o64.encode(42)), 42)
        self.assertEqual(o32.decode(o32.encode(42)), 42)

    def test_encoding(self):
        optimus_instances = [
            optimus_ids.Optimus(
                prime=309779747,
                inverse=49560203,
                random=57733611,
                bitlength=32
            ),
            optimus_ids.Optimus(
                prime=684934207,
                inverse=1505143743,
                random=846034763,
                bitlength=32
            ),
            optimus_ids.Optimus(
                prime=743534599,
                inverse=1356791223,
                random=1336232185,
                bitlength=32
            ),
            optimus_ids.Optimus(
                prime=54661037,
                inverse=1342843941,
                random=576322863,
                bitlength=32
            ),
            optimus_ids.Optimus(
                prime=198194831,
                inverse=229517423,
                random=459462336,
                bitlength=32
            ),
            optimus_ids.Optimus(
                prime=198194831,
                random=459462336,
                bitlength=32
            ),
        ]

        for i in range(5):
            o = optimus_instances[i]
            c = 10
            h = 100
            y = list(itertools.chain(
                range(c),
                (secrets.randbelow(optimus_ids.MAX_32_INT - 2 * c) + c
                    for j in range(h)),
                range(
                    optimus_ids.MAX_32_INT,
                    optimus_ids.MAX_32_INT - c - 1,
                    -1
                )
            ))
            for n in y:
                encoded = o.encode(n)
                decoded = o.decode(encoded)
                with self.subTest(i=i, n=n):
                    self.assertEqual(decoded, n)


if __name__ == '__main__':
    unittest.main()