test_utils.py

# coding=utf-8

# Copyright (c) 2013 Yubico AB
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#   without modification, are permitted provided that the following
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#       notice, this list of conditions and the following disclaimer.
#    2. Redistributions in binary form must reproduce the above
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import unittest

from fido2.utils import hmac_sha256, sha256, websafe_decode, websafe_encode


class TestSha256(unittest.TestCase):
    def test_sha256_vectors(self):
        self.assertEqual(
            sha256(b"abc"),
            bytes.fromhex(
                "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"
            ),
        )
        self.assertEqual(
            sha256(b"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"),
            bytes.fromhex(
                "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1"
            ),
        )


class TestHmacSha256(unittest.TestCase):
    def test_hmac_sha256_vectors(self):
        self.assertEqual(
            hmac_sha256(b"\x0b" * 20, b"Hi There"),
            bytes.fromhex(
                "b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7"
            ),
        )

        self.assertEqual(
            hmac_sha256(b"Jefe", b"what do ya want for nothing?"),
            bytes.fromhex(
                "5bdcc146bf60754e6a042426089575c75a003f089d2739839dec58b964ec3843"
            ),
        )


class TestWebSafe(unittest.TestCase):
    # Base64 vectors adapted from https://tools.ietf.org/html/rfc4648#section-10

    def test_websafe_decode(self):
        self.assertEqual(websafe_decode(b""), b"")
        self.assertEqual(websafe_decode(b"Zg"), b"f")
        self.assertEqual(websafe_decode(b"Zm8"), b"fo")
        self.assertEqual(websafe_decode(b"Zm9v"), b"foo")
        self.assertEqual(websafe_decode(b"Zm9vYg"), b"foob")
        self.assertEqual(websafe_decode(b"Zm9vYmE"), b"fooba")
        self.assertEqual(websafe_decode(b"Zm9vYmFy"), b"foobar")

    def test_websafe_decode_unicode(self):
        self.assertEqual(websafe_decode(""), b"")
        self.assertEqual(websafe_decode("Zm9vYmFy"), b"foobar")

    def test_websafe_encode(self):
        self.assertEqual(websafe_encode(b""), "")
        self.assertEqual(websafe_encode(b"f"), "Zg")
        self.assertEqual(websafe_encode(b"fo"), "Zm8")
        self.assertEqual(websafe_encode(b"foo"), "Zm9v")
        self.assertEqual(websafe_encode(b"foob"), "Zm9vYg")
        self.assertEqual(websafe_encode(b"fooba"), "Zm9vYmE")
        self.assertEqual(websafe_encode(b"foobar"), "Zm9vYmFy")