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