pycryptodome/lib/Crypto/SelfTest/PublicKey/test_import_ECC.py

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# Copyright (c) 2015, Legrandin <helderijs@gmail.com>
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import unittest
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.Util._file_system import pycryptodome_filename
from Crypto.Util.py3compat import b, unhexlify, bord
from Crypto.Util.number import bytes_to_long

from Crypto.PublicKey import ECC


def load_file(filename):
    fd = open(pycryptodome_filename([
                                    "Crypto",
                                    "SelfTest",
                                    "PublicKey",
                                    "test_vectors",
                                    "ECC",
                                    ], filename))
    return fd.read()


def compact(lines):
    return unhexlify(b("").join(lines).replace(" ", "").replace(":", ""))


def create_ref_keys():
    key_lines = load_file("ecc_p256.txt").splitlines()
    private_key_d = bytes_to_long(compact(key_lines[2:5]))
    public_key_xy = compact(key_lines[6:11])
    assert bord(public_key_xy[0]) == 4  # Uncompressed
    public_key_x = bytes_to_long(public_key_xy[1:33])
    public_key_y = bytes_to_long(public_key_xy[33:])

    return (ECC.construct(curve="P-256", d=private_key_d),
            ECC.construct(curve="P-256", point_x=public_key_x, point_y=public_key_y))


# Create reference key pair
ref_private, ref_public = create_ref_keys()


class TestImport(unittest.TestCase):

    def test_import_public_der(self):
        key_file = load_file("ecc_p256_public.der")

        key = ECC._import_subjectPublicKeyInfo(key_file)
        self.assertEqual(ref_public, key)

        key = ECC._import_der(key_file, None)
        self.assertEqual(ref_public, key)

    def test_import_private_der(self):
        key_file = load_file("ecc_p256_private.der")

        key = ECC._import_private_der(key_file, None)
        self.assertEqual(ref_private, key)

        key = ECC._import_der(key_file, None)
        self.assertEqual(ref_private, key)

    def test_import_private_pkcs8_clear(self):
        key_file = load_file("ecc_p256_private_p8_clear.der")

        key = ECC._import_der(key_file, None)
        self.assertEqual(ref_private, key)



def get_tests(config={}):
    tests = []
    tests += list_test_cases(TestImport)
    return tests

if __name__ == '__main__':
    suite = lambda: unittest.TestSuite(get_tests())
    unittest.main(defaultTest='suite')