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1import binascii
2import functools
3import hmac
4import hashlib
5import unittest
6import unittest.mock
7import warnings
8
9from test.support import hashlib_helper, check_disallow_instantiation
10
11from _operator import _compare_digest as operator_compare_digest
12
13try:
14    import _hashlib as _hashopenssl
15    from _hashlib import HMAC as C_HMAC
16    from _hashlib import hmac_new as c_hmac_new
17    from _hashlib import compare_digest as openssl_compare_digest
18except ImportError:
19    _hashopenssl = None
20    C_HMAC = None
21    c_hmac_new = None
22    openssl_compare_digest = None
23
24try:
25    import _sha256 as sha256_module
26except ImportError:
27    sha256_module = None
28
29
30def ignore_warning(func):
31    @functools.wraps(func)
32    def wrapper(*args, **kwargs):
33        with warnings.catch_warnings():
34            warnings.filterwarnings("ignore",
35                                    category=DeprecationWarning)
36            return func(*args, **kwargs)
37    return wrapper
38
39
40class TestVectorsTestCase(unittest.TestCase):
41
42    def assert_hmac_internals(
43            self, h, digest, hashname, digest_size, block_size
44    ):
45        self.assertEqual(h.hexdigest().upper(), digest.upper())
46        self.assertEqual(h.digest(), binascii.unhexlify(digest))
47        self.assertEqual(h.name, f"hmac-{hashname}")
48        self.assertEqual(h.digest_size, digest_size)
49        self.assertEqual(h.block_size, block_size)
50
51    def assert_hmac(
52        self, key, data, digest, hashfunc, hashname, digest_size, block_size
53    ):
54        h = hmac.HMAC(key, data, digestmod=hashfunc)
55        self.assert_hmac_internals(
56            h, digest, hashname, digest_size, block_size
57        )
58
59        h = hmac.HMAC(key, data, digestmod=hashname)
60        self.assert_hmac_internals(
61            h, digest, hashname, digest_size, block_size
62        )
63
64        h = hmac.HMAC(key, digestmod=hashname)
65        h2 = h.copy()
66        h2.update(b"test update")
67        h.update(data)
68        self.assertEqual(h.hexdigest().upper(), digest.upper())
69
70        h = hmac.new(key, data, digestmod=hashname)
71        self.assert_hmac_internals(
72            h, digest, hashname, digest_size, block_size
73        )
74
75        h = hmac.new(key, None, digestmod=hashname)
76        h.update(data)
77        self.assertEqual(h.hexdigest().upper(), digest.upper())
78
79        h = hmac.new(key, digestmod=hashname)
80        h.update(data)
81        self.assertEqual(h.hexdigest().upper(), digest.upper())
82
83        h = hmac.new(key, data, digestmod=hashfunc)
84        self.assertEqual(h.hexdigest().upper(), digest.upper())
85
86        self.assertEqual(
87            hmac.digest(key, data, digest=hashname),
88            binascii.unhexlify(digest)
89        )
90        self.assertEqual(
91            hmac.digest(key, data, digest=hashfunc),
92            binascii.unhexlify(digest)
93        )
94
95        h = hmac.HMAC.__new__(hmac.HMAC)
96        h._init_old(key, data, digestmod=hashname)
97        self.assert_hmac_internals(
98            h, digest, hashname, digest_size, block_size
99        )
100
101        if c_hmac_new is not None:
102            h = c_hmac_new(key, data, digestmod=hashname)
103            self.assert_hmac_internals(
104                h, digest, hashname, digest_size, block_size
105            )
106
107            h = c_hmac_new(key, digestmod=hashname)
108            h2 = h.copy()
109            h2.update(b"test update")
110            h.update(data)
111            self.assertEqual(h.hexdigest().upper(), digest.upper())
112
113            func = getattr(_hashopenssl, f"openssl_{hashname}")
114            h = c_hmac_new(key, data, digestmod=func)
115            self.assert_hmac_internals(
116                h, digest, hashname, digest_size, block_size
117            )
118
119            h = hmac.HMAC.__new__(hmac.HMAC)
120            h._init_hmac(key, data, digestmod=hashname)
121            self.assert_hmac_internals(
122                h, digest, hashname, digest_size, block_size
123            )
124
125    @hashlib_helper.requires_hashdigest('md5', openssl=True)
126    def test_md5_vectors(self):
127        # Test the HMAC module against test vectors from the RFC.
128
129        def md5test(key, data, digest):
130            self.assert_hmac(
131                key, data, digest,
132                hashfunc=hashlib.md5,
133                hashname="md5",
134                digest_size=16,
135                block_size=64
136            )
137
138        md5test(b"\x0b" * 16,
139                b"Hi There",
140                "9294727A3638BB1C13F48EF8158BFC9D")
141
142        md5test(b"Jefe",
143                b"what do ya want for nothing?",
144                "750c783e6ab0b503eaa86e310a5db738")
145
146        md5test(b"\xaa" * 16,
147                b"\xdd" * 50,
148                "56be34521d144c88dbb8c733f0e8b3f6")
149
150        md5test(bytes(range(1, 26)),
151                b"\xcd" * 50,
152                "697eaf0aca3a3aea3a75164746ffaa79")
153
154        md5test(b"\x0C" * 16,
155                b"Test With Truncation",
156                "56461ef2342edc00f9bab995690efd4c")
157
158        md5test(b"\xaa" * 80,
159                b"Test Using Larger Than Block-Size Key - Hash Key First",
160                "6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd")
161
162        md5test(b"\xaa" * 80,
163                (b"Test Using Larger Than Block-Size Key "
164                 b"and Larger Than One Block-Size Data"),
165                "6f630fad67cda0ee1fb1f562db3aa53e")
166
167    @hashlib_helper.requires_hashdigest('sha1', openssl=True)
168    def test_sha_vectors(self):
169        def shatest(key, data, digest):
170            self.assert_hmac(
171                key, data, digest,
172                hashfunc=hashlib.sha1,
173                hashname="sha1",
174                digest_size=20,
175                block_size=64
176            )
177
178        shatest(b"\x0b" * 20,
179                b"Hi There",
180                "b617318655057264e28bc0b6fb378c8ef146be00")
181
182        shatest(b"Jefe",
183                b"what do ya want for nothing?",
184                "effcdf6ae5eb2fa2d27416d5f184df9c259a7c79")
185
186        shatest(b"\xAA" * 20,
187                b"\xDD" * 50,
188                "125d7342b9ac11cd91a39af48aa17b4f63f175d3")
189
190        shatest(bytes(range(1, 26)),
191                b"\xCD" * 50,
192                "4c9007f4026250c6bc8414f9bf50c86c2d7235da")
193
194        shatest(b"\x0C" * 20,
195                b"Test With Truncation",
196                "4c1a03424b55e07fe7f27be1d58bb9324a9a5a04")
197
198        shatest(b"\xAA" * 80,
199                b"Test Using Larger Than Block-Size Key - Hash Key First",
200                "aa4ae5e15272d00e95705637ce8a3b55ed402112")
201
202        shatest(b"\xAA" * 80,
203                (b"Test Using Larger Than Block-Size Key "
204                 b"and Larger Than One Block-Size Data"),
205                "e8e99d0f45237d786d6bbaa7965c7808bbff1a91")
206
207    def _rfc4231_test_cases(self, hashfunc, hash_name, digest_size, block_size):
208        def hmactest(key, data, hexdigests):
209            digest = hexdigests[hashfunc]
210
211            self.assert_hmac(
212                key, data, digest,
213                hashfunc=hashfunc,
214                hashname=hash_name,
215                digest_size=digest_size,
216                block_size=block_size
217            )
218
219        # 4.2.  Test Case 1
220        hmactest(key = b'\x0b'*20,
221                 data = b'Hi There',
222                 hexdigests = {
223                   hashlib.sha224: '896fb1128abbdf196832107cd49df33f'
224                                   '47b4b1169912ba4f53684b22',
225                   hashlib.sha256: 'b0344c61d8db38535ca8afceaf0bf12b'
226                                   '881dc200c9833da726e9376c2e32cff7',
227                   hashlib.sha384: 'afd03944d84895626b0825f4ab46907f'
228                                   '15f9dadbe4101ec682aa034c7cebc59c'
229                                   'faea9ea9076ede7f4af152e8b2fa9cb6',
230                   hashlib.sha512: '87aa7cdea5ef619d4ff0b4241a1d6cb0'
231                                   '2379f4e2ce4ec2787ad0b30545e17cde'
232                                   'daa833b7d6b8a702038b274eaea3f4e4'
233                                   'be9d914eeb61f1702e696c203a126854',
234                 })
235
236        # 4.3.  Test Case 2
237        hmactest(key = b'Jefe',
238                 data = b'what do ya want for nothing?',
239                 hexdigests = {
240                   hashlib.sha224: 'a30e01098bc6dbbf45690f3a7e9e6d0f'
241                                   '8bbea2a39e6148008fd05e44',
242                   hashlib.sha256: '5bdcc146bf60754e6a042426089575c7'
243                                   '5a003f089d2739839dec58b964ec3843',
244                   hashlib.sha384: 'af45d2e376484031617f78d2b58a6b1b'
245                                   '9c7ef464f5a01b47e42ec3736322445e'
246                                   '8e2240ca5e69e2c78b3239ecfab21649',
247                   hashlib.sha512: '164b7a7bfcf819e2e395fbe73b56e0a3'
248                                   '87bd64222e831fd610270cd7ea250554'
249                                   '9758bf75c05a994a6d034f65f8f0e6fd'
250                                   'caeab1a34d4a6b4b636e070a38bce737',
251                 })
252
253        # 4.4.  Test Case 3
254        hmactest(key = b'\xaa'*20,
255                 data = b'\xdd'*50,
256                 hexdigests = {
257                   hashlib.sha224: '7fb3cb3588c6c1f6ffa9694d7d6ad264'
258                                   '9365b0c1f65d69d1ec8333ea',
259                   hashlib.sha256: '773ea91e36800e46854db8ebd09181a7'
260                                   '2959098b3ef8c122d9635514ced565fe',
261                   hashlib.sha384: '88062608d3e6ad8a0aa2ace014c8a86f'
262                                   '0aa635d947ac9febe83ef4e55966144b'
263                                   '2a5ab39dc13814b94e3ab6e101a34f27',
264                   hashlib.sha512: 'fa73b0089d56a284efb0f0756c890be9'
265                                   'b1b5dbdd8ee81a3655f83e33b2279d39'
266                                   'bf3e848279a722c806b485a47e67c807'
267                                   'b946a337bee8942674278859e13292fb',
268                 })
269
270        # 4.5.  Test Case 4
271        hmactest(key = bytes(x for x in range(0x01, 0x19+1)),
272                 data = b'\xcd'*50,
273                 hexdigests = {
274                   hashlib.sha224: '6c11506874013cac6a2abc1bb382627c'
275                                   'ec6a90d86efc012de7afec5a',
276                   hashlib.sha256: '82558a389a443c0ea4cc819899f2083a'
277                                   '85f0faa3e578f8077a2e3ff46729665b',
278                   hashlib.sha384: '3e8a69b7783c25851933ab6290af6ca7'
279                                   '7a9981480850009cc5577c6e1f573b4e'
280                                   '6801dd23c4a7d679ccf8a386c674cffb',
281                   hashlib.sha512: 'b0ba465637458c6990e5a8c5f61d4af7'
282                                   'e576d97ff94b872de76f8050361ee3db'
283                                   'a91ca5c11aa25eb4d679275cc5788063'
284                                   'a5f19741120c4f2de2adebeb10a298dd',
285                 })
286
287        # 4.7.  Test Case 6
288        hmactest(key = b'\xaa'*131,
289                 data = b'Test Using Larger Than Block-Siz'
290                        b'e Key - Hash Key First',
291                 hexdigests = {
292                   hashlib.sha224: '95e9a0db962095adaebe9b2d6f0dbce2'
293                                   'd499f112f2d2b7273fa6870e',
294                   hashlib.sha256: '60e431591ee0b67f0d8a26aacbf5b77f'
295                                   '8e0bc6213728c5140546040f0ee37f54',
296                   hashlib.sha384: '4ece084485813e9088d2c63a041bc5b4'
297                                   '4f9ef1012a2b588f3cd11f05033ac4c6'
298                                   '0c2ef6ab4030fe8296248df163f44952',
299                   hashlib.sha512: '80b24263c7c1a3ebb71493c1dd7be8b4'
300                                   '9b46d1f41b4aeec1121b013783f8f352'
301                                   '6b56d037e05f2598bd0fd2215d6a1e52'
302                                   '95e64f73f63f0aec8b915a985d786598',
303                 })
304
305        # 4.8.  Test Case 7
306        hmactest(key = b'\xaa'*131,
307                 data = b'This is a test using a larger th'
308                        b'an block-size key and a larger t'
309                        b'han block-size data. The key nee'
310                        b'ds to be hashed before being use'
311                        b'd by the HMAC algorithm.',
312                 hexdigests = {
313                   hashlib.sha224: '3a854166ac5d9f023f54d517d0b39dbd'
314                                   '946770db9c2b95c9f6f565d1',
315                   hashlib.sha256: '9b09ffa71b942fcb27635fbcd5b0e944'
316                                   'bfdc63644f0713938a7f51535c3a35e2',
317                   hashlib.sha384: '6617178e941f020d351e2f254e8fd32c'
318                                   '602420feb0b8fb9adccebb82461e99c5'
319                                   'a678cc31e799176d3860e6110c46523e',
320                   hashlib.sha512: 'e37b6a775dc87dbaa4dfa9f96e5e3ffd'
321                                   'debd71f8867289865df5a32d20cdc944'
322                                   'b6022cac3c4982b10d5eeb55c3e4de15'
323                                   '134676fb6de0446065c97440fa8c6a58',
324                 })
325
326    @hashlib_helper.requires_hashdigest('sha224', openssl=True)
327    def test_sha224_rfc4231(self):
328        self._rfc4231_test_cases(hashlib.sha224, 'sha224', 28, 64)
329
330    @hashlib_helper.requires_hashdigest('sha256', openssl=True)
331    def test_sha256_rfc4231(self):
332        self._rfc4231_test_cases(hashlib.sha256, 'sha256', 32, 64)
333
334    @hashlib_helper.requires_hashdigest('sha384', openssl=True)
335    def test_sha384_rfc4231(self):
336        self._rfc4231_test_cases(hashlib.sha384, 'sha384', 48, 128)
337
338    @hashlib_helper.requires_hashdigest('sha512', openssl=True)
339    def test_sha512_rfc4231(self):
340        self._rfc4231_test_cases(hashlib.sha512, 'sha512', 64, 128)
341
342    @hashlib_helper.requires_hashdigest('sha256')
343    def test_legacy_block_size_warnings(self):
344        class MockCrazyHash(object):
345            """Ain't no block_size attribute here."""
346            def __init__(self, *args):
347                self._x = hashlib.sha256(*args)
348                self.digest_size = self._x.digest_size
349            def update(self, v):
350                self._x.update(v)
351            def digest(self):
352                return self._x.digest()
353
354        with warnings.catch_warnings():
355            warnings.simplefilter('error', RuntimeWarning)
356            with self.assertRaises(RuntimeWarning):
357                hmac.HMAC(b'a', b'b', digestmod=MockCrazyHash)
358                self.fail('Expected warning about missing block_size')
359
360            MockCrazyHash.block_size = 1
361            with self.assertRaises(RuntimeWarning):
362                hmac.HMAC(b'a', b'b', digestmod=MockCrazyHash)
363                self.fail('Expected warning about small block_size')
364
365    def test_with_digestmod_no_default(self):
366        """The digestmod parameter is required as of Python 3.8."""
367        with self.assertRaisesRegex(TypeError, r'required.*digestmod'):
368            key = b"\x0b" * 16
369            data = b"Hi There"
370            hmac.HMAC(key, data, digestmod=None)
371        with self.assertRaisesRegex(TypeError, r'required.*digestmod'):
372            hmac.new(key, data)
373        with self.assertRaisesRegex(TypeError, r'required.*digestmod'):
374            hmac.HMAC(key, msg=data, digestmod='')
375
376
377class ConstructorTestCase(unittest.TestCase):
378
379    expected = (
380        "6c845b47f52b3b47f6590c502db7825aad757bf4fadc8fa972f7cd2e76a5bdeb"
381    )
382
383    @hashlib_helper.requires_hashdigest('sha256')
384    def test_normal(self):
385        # Standard constructor call.
386        try:
387            hmac.HMAC(b"key", digestmod='sha256')
388        except Exception:
389            self.fail("Standard constructor call raised exception.")
390
391    @hashlib_helper.requires_hashdigest('sha256')
392    def test_with_str_key(self):
393        # Pass a key of type str, which is an error, because it expects a key
394        # of type bytes
395        with self.assertRaises(TypeError):
396            h = hmac.HMAC("key", digestmod='sha256')
397
398    @hashlib_helper.requires_hashdigest('sha256')
399    def test_dot_new_with_str_key(self):
400        # Pass a key of type str, which is an error, because it expects a key
401        # of type bytes
402        with self.assertRaises(TypeError):
403            h = hmac.new("key", digestmod='sha256')
404
405    @hashlib_helper.requires_hashdigest('sha256')
406    def test_withtext(self):
407        # Constructor call with text.
408        try:
409            h = hmac.HMAC(b"key", b"hash this!", digestmod='sha256')
410        except Exception:
411            self.fail("Constructor call with text argument raised exception.")
412        self.assertEqual(h.hexdigest(), self.expected)
413
414    @hashlib_helper.requires_hashdigest('sha256')
415    def test_with_bytearray(self):
416        try:
417            h = hmac.HMAC(bytearray(b"key"), bytearray(b"hash this!"),
418                          digestmod="sha256")
419        except Exception:
420            self.fail("Constructor call with bytearray arguments raised exception.")
421        self.assertEqual(h.hexdigest(), self.expected)
422
423    @hashlib_helper.requires_hashdigest('sha256')
424    def test_with_memoryview_msg(self):
425        try:
426            h = hmac.HMAC(b"key", memoryview(b"hash this!"), digestmod="sha256")
427        except Exception:
428            self.fail("Constructor call with memoryview msg raised exception.")
429        self.assertEqual(h.hexdigest(), self.expected)
430
431    @hashlib_helper.requires_hashdigest('sha256')
432    def test_withmodule(self):
433        # Constructor call with text and digest module.
434        try:
435            h = hmac.HMAC(b"key", b"", hashlib.sha256)
436        except Exception:
437            self.fail("Constructor call with hashlib.sha256 raised exception.")
438
439    @unittest.skipUnless(C_HMAC is not None, 'need _hashlib')
440    def test_internal_types(self):
441        # internal types like _hashlib.C_HMAC are not constructable
442        check_disallow_instantiation(self, C_HMAC)
443        with self.assertRaisesRegex(TypeError, "immutable type"):
444            C_HMAC.value = None
445
446    @unittest.skipUnless(sha256_module is not None, 'need _sha256')
447    def test_with_sha256_module(self):
448        h = hmac.HMAC(b"key", b"hash this!", digestmod=sha256_module.sha256)
449        self.assertEqual(h.hexdigest(), self.expected)
450        self.assertEqual(h.name, "hmac-sha256")
451
452        digest = hmac.digest(b"key", b"hash this!", sha256_module.sha256)
453        self.assertEqual(digest, binascii.unhexlify(self.expected))
454
455
456class SanityTestCase(unittest.TestCase):
457
458    @hashlib_helper.requires_hashdigest('sha256')
459    def test_exercise_all_methods(self):
460        # Exercising all methods once.
461        # This must not raise any exceptions
462        try:
463            h = hmac.HMAC(b"my secret key", digestmod="sha256")
464            h.update(b"compute the hash of this text!")
465            h.digest()
466            h.hexdigest()
467            h.copy()
468        except Exception:
469            self.fail("Exception raised during normal usage of HMAC class.")
470
471
472class CopyTestCase(unittest.TestCase):
473
474    @hashlib_helper.requires_hashdigest('sha256')
475    def test_attributes_old(self):
476        # Testing if attributes are of same type.
477        h1 = hmac.HMAC.__new__(hmac.HMAC)
478        h1._init_old(b"key", b"msg", digestmod="sha256")
479        h2 = h1.copy()
480        self.assertEqual(type(h1._inner), type(h2._inner),
481            "Types of inner don't match.")
482        self.assertEqual(type(h1._outer), type(h2._outer),
483            "Types of outer don't match.")
484
485    @hashlib_helper.requires_hashdigest('sha256')
486    def test_realcopy_old(self):
487        # Testing if the copy method created a real copy.
488        h1 = hmac.HMAC.__new__(hmac.HMAC)
489        h1._init_old(b"key", b"msg", digestmod="sha256")
490        h2 = h1.copy()
491        # Using id() in case somebody has overridden __eq__/__ne__.
492        self.assertTrue(id(h1) != id(h2), "No real copy of the HMAC instance.")
493        self.assertTrue(id(h1._inner) != id(h2._inner),
494            "No real copy of the attribute 'inner'.")
495        self.assertTrue(id(h1._outer) != id(h2._outer),
496            "No real copy of the attribute 'outer'.")
497        self.assertIs(h1._hmac, None)
498
499    @unittest.skipIf(_hashopenssl is None, "test requires _hashopenssl")
500    @hashlib_helper.requires_hashdigest('sha256')
501    def test_realcopy_hmac(self):
502        h1 = hmac.HMAC.__new__(hmac.HMAC)
503        h1._init_hmac(b"key", b"msg", digestmod="sha256")
504        h2 = h1.copy()
505        self.assertTrue(id(h1._hmac) != id(h2._hmac))
506
507    @hashlib_helper.requires_hashdigest('sha256')
508    def test_equality(self):
509        # Testing if the copy has the same digests.
510        h1 = hmac.HMAC(b"key", digestmod="sha256")
511        h1.update(b"some random text")
512        h2 = h1.copy()
513        self.assertEqual(h1.digest(), h2.digest(),
514            "Digest of copy doesn't match original digest.")
515        self.assertEqual(h1.hexdigest(), h2.hexdigest(),
516            "Hexdigest of copy doesn't match original hexdigest.")
517
518    @hashlib_helper.requires_hashdigest('sha256')
519    def test_equality_new(self):
520        # Testing if the copy has the same digests with hmac.new().
521        h1 = hmac.new(b"key", digestmod="sha256")
522        h1.update(b"some random text")
523        h2 = h1.copy()
524        self.assertTrue(
525            id(h1) != id(h2), "No real copy of the HMAC instance."
526        )
527        self.assertEqual(h1.digest(), h2.digest(),
528            "Digest of copy doesn't match original digest.")
529        self.assertEqual(h1.hexdigest(), h2.hexdigest(),
530            "Hexdigest of copy doesn't match original hexdigest.")
531
532
533class CompareDigestTestCase(unittest.TestCase):
534
535    def test_hmac_compare_digest(self):
536        self._test_compare_digest(hmac.compare_digest)
537        if openssl_compare_digest is not None:
538            self.assertIs(hmac.compare_digest, openssl_compare_digest)
539        else:
540            self.assertIs(hmac.compare_digest, operator_compare_digest)
541
542    def test_operator_compare_digest(self):
543        self._test_compare_digest(operator_compare_digest)
544
545    @unittest.skipIf(openssl_compare_digest is None, "test requires _hashlib")
546    def test_openssl_compare_digest(self):
547        self._test_compare_digest(openssl_compare_digest)
548
549    def _test_compare_digest(self, compare_digest):
550        # Testing input type exception handling
551        a, b = 100, 200
552        self.assertRaises(TypeError, compare_digest, a, b)
553        a, b = 100, b"foobar"
554        self.assertRaises(TypeError, compare_digest, a, b)
555        a, b = b"foobar", 200
556        self.assertRaises(TypeError, compare_digest, a, b)
557        a, b = "foobar", b"foobar"
558        self.assertRaises(TypeError, compare_digest, a, b)
559        a, b = b"foobar", "foobar"
560        self.assertRaises(TypeError, compare_digest, a, b)
561
562        # Testing bytes of different lengths
563        a, b = b"foobar", b"foo"
564        self.assertFalse(compare_digest(a, b))
565        a, b = b"\xde\xad\xbe\xef", b"\xde\xad"
566        self.assertFalse(compare_digest(a, b))
567
568        # Testing bytes of same lengths, different values
569        a, b = b"foobar", b"foobaz"
570        self.assertFalse(compare_digest(a, b))
571        a, b = b"\xde\xad\xbe\xef", b"\xab\xad\x1d\xea"
572        self.assertFalse(compare_digest(a, b))
573
574        # Testing bytes of same lengths, same values
575        a, b = b"foobar", b"foobar"
576        self.assertTrue(compare_digest(a, b))
577        a, b = b"\xde\xad\xbe\xef", b"\xde\xad\xbe\xef"
578        self.assertTrue(compare_digest(a, b))
579
580        # Testing bytearrays of same lengths, same values
581        a, b = bytearray(b"foobar"), bytearray(b"foobar")
582        self.assertTrue(compare_digest(a, b))
583
584        # Testing bytearrays of different lengths
585        a, b = bytearray(b"foobar"), bytearray(b"foo")
586        self.assertFalse(compare_digest(a, b))
587
588        # Testing bytearrays of same lengths, different values
589        a, b = bytearray(b"foobar"), bytearray(b"foobaz")
590        self.assertFalse(compare_digest(a, b))
591
592        # Testing byte and bytearray of same lengths, same values
593        a, b = bytearray(b"foobar"), b"foobar"
594        self.assertTrue(compare_digest(a, b))
595        self.assertTrue(compare_digest(b, a))
596
597        # Testing byte bytearray of different lengths
598        a, b = bytearray(b"foobar"), b"foo"
599        self.assertFalse(compare_digest(a, b))
600        self.assertFalse(compare_digest(b, a))
601
602        # Testing byte and bytearray of same lengths, different values
603        a, b = bytearray(b"foobar"), b"foobaz"
604        self.assertFalse(compare_digest(a, b))
605        self.assertFalse(compare_digest(b, a))
606
607        # Testing str of same lengths
608        a, b = "foobar", "foobar"
609        self.assertTrue(compare_digest(a, b))
610
611        # Testing str of different lengths
612        a, b = "foo", "foobar"
613        self.assertFalse(compare_digest(a, b))
614
615        # Testing bytes of same lengths, different values
616        a, b = "foobar", "foobaz"
617        self.assertFalse(compare_digest(a, b))
618
619        # Testing error cases
620        a, b = "foobar", b"foobar"
621        self.assertRaises(TypeError, compare_digest, a, b)
622        a, b = b"foobar", "foobar"
623        self.assertRaises(TypeError, compare_digest, a, b)
624        a, b = b"foobar", 1
625        self.assertRaises(TypeError, compare_digest, a, b)
626        a, b = 100, 200
627        self.assertRaises(TypeError, compare_digest, a, b)
628        a, b = "fooä", "fooä"
629        self.assertRaises(TypeError, compare_digest, a, b)
630
631        # subclasses are supported by ignore __eq__
632        class mystr(str):
633            def __eq__(self, other):
634                return False
635
636        a, b = mystr("foobar"), mystr("foobar")
637        self.assertTrue(compare_digest(a, b))
638        a, b = mystr("foobar"), "foobar"
639        self.assertTrue(compare_digest(a, b))
640        a, b = mystr("foobar"), mystr("foobaz")
641        self.assertFalse(compare_digest(a, b))
642
643        class mybytes(bytes):
644            def __eq__(self, other):
645                return False
646
647        a, b = mybytes(b"foobar"), mybytes(b"foobar")
648        self.assertTrue(compare_digest(a, b))
649        a, b = mybytes(b"foobar"), b"foobar"
650        self.assertTrue(compare_digest(a, b))
651        a, b = mybytes(b"foobar"), mybytes(b"foobaz")
652        self.assertFalse(compare_digest(a, b))
653
654
655if __name__ == "__main__":
656    unittest.main()
657