Python code coverage for Lib/test/test_hmac.py

#	count	content
1	n/a	import functools
2	n/a	import hmac
3	n/a	import hashlib
4	n/a	import unittest
5	n/a	import warnings
6	n/a
7	n/a
8	n/a	def ignore_warning(func):
9	n/a	@functools.wraps(func)
10	n/a	def wrapper(args, *kwargs):
11	n/a	with warnings.catch_warnings():
12	n/a	warnings.filterwarnings("ignore",
13	n/a	category=PendingDeprecationWarning)
14	n/a	return func(args, *kwargs)
15	n/a	return wrapper
16	n/a
17	n/a
18	n/a	class TestVectorsTestCase(unittest.TestCase):
19	n/a
20	n/a	def test_md5_vectors(self):
21	n/a	# Test the HMAC module against test vectors from the RFC.
22	n/a
23	n/a	def md5test(key, data, digest):
24	n/a	h = hmac.HMAC(key, data, digestmod=hashlib.md5)
25	n/a	self.assertEqual(h.hexdigest().upper(), digest.upper())
26	n/a	self.assertEqual(h.name, "hmac-md5")
27	n/a	self.assertEqual(h.digest_size, 16)
28	n/a	self.assertEqual(h.block_size, 64)
29	n/a
30	n/a	h = hmac.HMAC(key, data, digestmod='md5')
31	n/a	self.assertEqual(h.hexdigest().upper(), digest.upper())
32	n/a	self.assertEqual(h.name, "hmac-md5")
33	n/a	self.assertEqual(h.digest_size, 16)
34	n/a	self.assertEqual(h.block_size, 64)
35	n/a
36	n/a
37	n/a	md5test(b"\x0b" * 16,
38	n/a	b"Hi There",
39	n/a	"9294727A3638BB1C13F48EF8158BFC9D")
40	n/a
41	n/a	md5test(b"Jefe",
42	n/a	b"what do ya want for nothing?",
43	n/a	"750c783e6ab0b503eaa86e310a5db738")
44	n/a
45	n/a	md5test(b"\xaa" * 16,
46	n/a	b"\xdd" * 50,
47	n/a	"56be34521d144c88dbb8c733f0e8b3f6")
48	n/a
49	n/a	md5test(bytes(range(1, 26)),
50	n/a	b"\xcd" * 50,
51	n/a	"697eaf0aca3a3aea3a75164746ffaa79")
52	n/a
53	n/a	md5test(b"\x0C" * 16,
54	n/a	b"Test With Truncation",
55	n/a	"56461ef2342edc00f9bab995690efd4c")
56	n/a
57	n/a	md5test(b"\xaa" * 80,
58	n/a	b"Test Using Larger Than Block-Size Key - Hash Key First",
59	n/a	"6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd")
60	n/a
61	n/a	md5test(b"\xaa" * 80,
62	n/a	(b"Test Using Larger Than Block-Size Key "
63	n/a	b"and Larger Than One Block-Size Data"),
64	n/a	"6f630fad67cda0ee1fb1f562db3aa53e")
65	n/a
66	n/a	def test_sha_vectors(self):
67	n/a	def shatest(key, data, digest):
68	n/a	h = hmac.HMAC(key, data, digestmod=hashlib.sha1)
69	n/a	self.assertEqual(h.hexdigest().upper(), digest.upper())
70	n/a	self.assertEqual(h.name, "hmac-sha1")
71	n/a	self.assertEqual(h.digest_size, 20)
72	n/a	self.assertEqual(h.block_size, 64)
73	n/a
74	n/a	h = hmac.HMAC(key, data, digestmod='sha1')
75	n/a	self.assertEqual(h.hexdigest().upper(), digest.upper())
76	n/a	self.assertEqual(h.name, "hmac-sha1")
77	n/a	self.assertEqual(h.digest_size, 20)
78	n/a	self.assertEqual(h.block_size, 64)
79	n/a
80	n/a
81	n/a	shatest(b"\x0b" * 20,
82	n/a	b"Hi There",
83	n/a	"b617318655057264e28bc0b6fb378c8ef146be00")
84	n/a
85	n/a	shatest(b"Jefe",
86	n/a	b"what do ya want for nothing?",
87	n/a	"effcdf6ae5eb2fa2d27416d5f184df9c259a7c79")
88	n/a
89	n/a	shatest(b"\xAA" * 20,
90	n/a	b"\xDD" * 50,
91	n/a	"125d7342b9ac11cd91a39af48aa17b4f63f175d3")
92	n/a
93	n/a	shatest(bytes(range(1, 26)),
94	n/a	b"\xCD" * 50,
95	n/a	"4c9007f4026250c6bc8414f9bf50c86c2d7235da")
96	n/a
97	n/a	shatest(b"\x0C" * 20,
98	n/a	b"Test With Truncation",
99	n/a	"4c1a03424b55e07fe7f27be1d58bb9324a9a5a04")
100	n/a
101	n/a	shatest(b"\xAA" * 80,
102	n/a	b"Test Using Larger Than Block-Size Key - Hash Key First",
103	n/a	"aa4ae5e15272d00e95705637ce8a3b55ed402112")
104	n/a
105	n/a	shatest(b"\xAA" * 80,
106	n/a	(b"Test Using Larger Than Block-Size Key "
107	n/a	b"and Larger Than One Block-Size Data"),
108	n/a	"e8e99d0f45237d786d6bbaa7965c7808bbff1a91")
109	n/a
110	n/a	def _rfc4231_test_cases(self, hashfunc, hash_name, digest_size, block_size):
111	n/a	def hmactest(key, data, hexdigests):
112	n/a	hmac_name = "hmac-" + hash_name
113	n/a	h = hmac.HMAC(key, data, digestmod=hashfunc)
114	n/a	self.assertEqual(h.hexdigest().lower(), hexdigests[hashfunc])
115	n/a	self.assertEqual(h.name, hmac_name)
116	n/a	self.assertEqual(h.digest_size, digest_size)
117	n/a	self.assertEqual(h.block_size, block_size)
118	n/a
119	n/a	h = hmac.HMAC(key, data, digestmod=hash_name)
120	n/a	self.assertEqual(h.hexdigest().lower(), hexdigests[hashfunc])
121	n/a	self.assertEqual(h.name, hmac_name)
122	n/a	self.assertEqual(h.digest_size, digest_size)
123	n/a	self.assertEqual(h.block_size, block_size)
124	n/a
125	n/a
126	n/a	# 4.2. Test Case 1
127	n/a	hmactest(key = b'\x0b'*20,
128	n/a	data = b'Hi There',
129	n/a	hexdigests = {
130	n/a	hashlib.sha224: '896fb1128abbdf196832107cd49df33f'
131	n/a	'47b4b1169912ba4f53684b22',
132	n/a	hashlib.sha256: 'b0344c61d8db38535ca8afceaf0bf12b'
133	n/a	'881dc200c9833da726e9376c2e32cff7',
134	n/a	hashlib.sha384: 'afd03944d84895626b0825f4ab46907f'
135	n/a	'15f9dadbe4101ec682aa034c7cebc59c'
136	n/a	'faea9ea9076ede7f4af152e8b2fa9cb6',
137	n/a	hashlib.sha512: '87aa7cdea5ef619d4ff0b4241a1d6cb0'
138	n/a	'2379f4e2ce4ec2787ad0b30545e17cde'
139	n/a	'daa833b7d6b8a702038b274eaea3f4e4'
140	n/a	'be9d914eeb61f1702e696c203a126854',
141	n/a	})
142	n/a
143	n/a	# 4.3. Test Case 2
144	n/a	hmactest(key = b'Jefe',
145	n/a	data = b'what do ya want for nothing?',
146	n/a	hexdigests = {
147	n/a	hashlib.sha224: 'a30e01098bc6dbbf45690f3a7e9e6d0f'
148	n/a	'8bbea2a39e6148008fd05e44',
149	n/a	hashlib.sha256: '5bdcc146bf60754e6a042426089575c7'
150	n/a	'5a003f089d2739839dec58b964ec3843',
151	n/a	hashlib.sha384: 'af45d2e376484031617f78d2b58a6b1b'
152	n/a	'9c7ef464f5a01b47e42ec3736322445e'
153	n/a	'8e2240ca5e69e2c78b3239ecfab21649',
154	n/a	hashlib.sha512: '164b7a7bfcf819e2e395fbe73b56e0a3'
155	n/a	'87bd64222e831fd610270cd7ea250554'
156	n/a	'9758bf75c05a994a6d034f65f8f0e6fd'
157	n/a	'caeab1a34d4a6b4b636e070a38bce737',
158	n/a	})
159	n/a
160	n/a	# 4.4. Test Case 3
161	n/a	hmactest(key = b'\xaa'*20,
162	n/a	data = b'\xdd'*50,
163	n/a	hexdigests = {
164	n/a	hashlib.sha224: '7fb3cb3588c6c1f6ffa9694d7d6ad264'
165	n/a	'9365b0c1f65d69d1ec8333ea',
166	n/a	hashlib.sha256: '773ea91e36800e46854db8ebd09181a7'
167	n/a	'2959098b3ef8c122d9635514ced565fe',
168	n/a	hashlib.sha384: '88062608d3e6ad8a0aa2ace014c8a86f'
169	n/a	'0aa635d947ac9febe83ef4e55966144b'
170	n/a	'2a5ab39dc13814b94e3ab6e101a34f27',
171	n/a	hashlib.sha512: 'fa73b0089d56a284efb0f0756c890be9'
172	n/a	'b1b5dbdd8ee81a3655f83e33b2279d39'
173	n/a	'bf3e848279a722c806b485a47e67c807'
174	n/a	'b946a337bee8942674278859e13292fb',
175	n/a	})
176	n/a
177	n/a	# 4.5. Test Case 4
178	n/a	hmactest(key = bytes(x for x in range(0x01, 0x19+1)),
179	n/a	data = b'\xcd'*50,
180	n/a	hexdigests = {
181	n/a	hashlib.sha224: '6c11506874013cac6a2abc1bb382627c'
182	n/a	'ec6a90d86efc012de7afec5a',
183	n/a	hashlib.sha256: '82558a389a443c0ea4cc819899f2083a'
184	n/a	'85f0faa3e578f8077a2e3ff46729665b',
185	n/a	hashlib.sha384: '3e8a69b7783c25851933ab6290af6ca7'
186	n/a	'7a9981480850009cc5577c6e1f573b4e'
187	n/a	'6801dd23c4a7d679ccf8a386c674cffb',
188	n/a	hashlib.sha512: 'b0ba465637458c6990e5a8c5f61d4af7'
189	n/a	'e576d97ff94b872de76f8050361ee3db'
190	n/a	'a91ca5c11aa25eb4d679275cc5788063'
191	n/a	'a5f19741120c4f2de2adebeb10a298dd',
192	n/a	})
193	n/a
194	n/a	# 4.7. Test Case 6
195	n/a	hmactest(key = b'\xaa'*131,
196	n/a	data = b'Test Using Larger Than Block-Siz'
197	n/a	b'e Key - Hash Key First',
198	n/a	hexdigests = {
199	n/a	hashlib.sha224: '95e9a0db962095adaebe9b2d6f0dbce2'
200	n/a	'd499f112f2d2b7273fa6870e',
201	n/a	hashlib.sha256: '60e431591ee0b67f0d8a26aacbf5b77f'
202	n/a	'8e0bc6213728c5140546040f0ee37f54',
203	n/a	hashlib.sha384: '4ece084485813e9088d2c63a041bc5b4'
204	n/a	'4f9ef1012a2b588f3cd11f05033ac4c6'
205	n/a	'0c2ef6ab4030fe8296248df163f44952',
206	n/a	hashlib.sha512: '80b24263c7c1a3ebb71493c1dd7be8b4'
207	n/a	'9b46d1f41b4aeec1121b013783f8f352'
208	n/a	'6b56d037e05f2598bd0fd2215d6a1e52'
209	n/a	'95e64f73f63f0aec8b915a985d786598',
210	n/a	})
211	n/a
212	n/a	# 4.8. Test Case 7
213	n/a	hmactest(key = b'\xaa'*131,
214	n/a	data = b'This is a test using a larger th'
215	n/a	b'an block-size key and a larger t'
216	n/a	b'han block-size data. The key nee'
217	n/a	b'ds to be hashed before being use'
218	n/a	b'd by the HMAC algorithm.',
219	n/a	hexdigests = {
220	n/a	hashlib.sha224: '3a854166ac5d9f023f54d517d0b39dbd'
221	n/a	'946770db9c2b95c9f6f565d1',
222	n/a	hashlib.sha256: '9b09ffa71b942fcb27635fbcd5b0e944'
223	n/a	'bfdc63644f0713938a7f51535c3a35e2',
224	n/a	hashlib.sha384: '6617178e941f020d351e2f254e8fd32c'
225	n/a	'602420feb0b8fb9adccebb82461e99c5'
226	n/a	'a678cc31e799176d3860e6110c46523e',
227	n/a	hashlib.sha512: 'e37b6a775dc87dbaa4dfa9f96e5e3ffd'
228	n/a	'debd71f8867289865df5a32d20cdc944'
229	n/a	'b6022cac3c4982b10d5eeb55c3e4de15'
230	n/a	'134676fb6de0446065c97440fa8c6a58',
231	n/a	})
232	n/a
233	n/a	def test_sha224_rfc4231(self):
234	n/a	self._rfc4231_test_cases(hashlib.sha224, 'sha224', 28, 64)
235	n/a
236	n/a	def test_sha256_rfc4231(self):
237	n/a	self._rfc4231_test_cases(hashlib.sha256, 'sha256', 32, 64)
238	n/a
239	n/a	def test_sha384_rfc4231(self):
240	n/a	self._rfc4231_test_cases(hashlib.sha384, 'sha384', 48, 128)
241	n/a
242	n/a	def test_sha512_rfc4231(self):
243	n/a	self._rfc4231_test_cases(hashlib.sha512, 'sha512', 64, 128)
244	n/a
245	n/a	def test_legacy_block_size_warnings(self):
246	n/a	class MockCrazyHash(object):
247	n/a	"""Ain't no block_size attribute here."""
248	n/a	def __init__(self, *args):
249	n/a	self._x = hashlib.sha1(*args)
250	n/a	self.digest_size = self._x.digest_size
251	n/a	def update(self, v):
252	n/a	self._x.update(v)
253	n/a	def digest(self):
254	n/a	return self._x.digest()
255	n/a
256	n/a	with warnings.catch_warnings():
257	n/a	warnings.simplefilter('error', RuntimeWarning)
258	n/a	with self.assertRaises(RuntimeWarning):
259	n/a	hmac.HMAC(b'a', b'b', digestmod=MockCrazyHash)
260	n/a	self.fail('Expected warning about missing block_size')
261	n/a
262	n/a	MockCrazyHash.block_size = 1
263	n/a	with self.assertRaises(RuntimeWarning):
264	n/a	hmac.HMAC(b'a', b'b', digestmod=MockCrazyHash)
265	n/a	self.fail('Expected warning about small block_size')
266	n/a
267	n/a	def test_with_digestmod_warning(self):
268	n/a	with self.assertWarns(PendingDeprecationWarning):
269	n/a	key = b"\x0b" * 16
270	n/a	data = b"Hi There"
271	n/a	digest = "9294727A3638BB1C13F48EF8158BFC9D"
272	n/a	h = hmac.HMAC(key, data)
273	n/a	self.assertEqual(h.hexdigest().upper(), digest)
274	n/a
275	n/a
276	n/a	class ConstructorTestCase(unittest.TestCase):
277	n/a
278	n/a	@ignore_warning
279	n/a	def test_normal(self):
280	n/a	# Standard constructor call.
281	n/a	failed = 0
282	n/a	try:
283	n/a	h = hmac.HMAC(b"key")
284	n/a	except Exception:
285	n/a	self.fail("Standard constructor call raised exception.")
286	n/a
287	n/a	@ignore_warning
288	n/a	def test_with_str_key(self):
289	n/a	# Pass a key of type str, which is an error, because it expects a key
290	n/a	# of type bytes
291	n/a	with self.assertRaises(TypeError):
292	n/a	h = hmac.HMAC("key")
293	n/a
294	n/a	@ignore_warning
295	n/a	def test_dot_new_with_str_key(self):
296	n/a	# Pass a key of type str, which is an error, because it expects a key
297	n/a	# of type bytes
298	n/a	with self.assertRaises(TypeError):
299	n/a	h = hmac.new("key")
300	n/a
301	n/a	@ignore_warning
302	n/a	def test_withtext(self):
303	n/a	# Constructor call with text.
304	n/a	try:
305	n/a	h = hmac.HMAC(b"key", b"hash this!")
306	n/a	except Exception:
307	n/a	self.fail("Constructor call with text argument raised exception.")
308	n/a	self.assertEqual(h.hexdigest(), '34325b639da4cfd95735b381e28cb864')
309	n/a
310	n/a	def test_with_bytearray(self):
311	n/a	try:
312	n/a	h = hmac.HMAC(bytearray(b"key"), bytearray(b"hash this!"),
313	n/a	digestmod="md5")
314	n/a	except Exception:
315	n/a	self.fail("Constructor call with bytearray arguments raised exception.")
316	n/a	self.assertEqual(h.hexdigest(), '34325b639da4cfd95735b381e28cb864')
317	n/a
318	n/a	def test_with_memoryview_msg(self):
319	n/a	try:
320	n/a	h = hmac.HMAC(b"key", memoryview(b"hash this!"), digestmod="md5")
321	n/a	except Exception:
322	n/a	self.fail("Constructor call with memoryview msg raised exception.")
323	n/a	self.assertEqual(h.hexdigest(), '34325b639da4cfd95735b381e28cb864')
324	n/a
325	n/a	def test_withmodule(self):
326	n/a	# Constructor call with text and digest module.
327	n/a	try:
328	n/a	h = hmac.HMAC(b"key", b"", hashlib.sha1)
329	n/a	except Exception:
330	n/a	self.fail("Constructor call with hashlib.sha1 raised exception.")
331	n/a
332	n/a	class SanityTestCase(unittest.TestCase):
333	n/a
334	n/a	@ignore_warning
335	n/a	def test_default_is_md5(self):
336	n/a	# Testing if HMAC defaults to MD5 algorithm.
337	n/a	# NOTE: this whitebox test depends on the hmac class internals
338	n/a	h = hmac.HMAC(b"key")
339	n/a	self.assertEqual(h.digest_cons, hashlib.md5)
340	n/a
341	n/a	def test_exercise_all_methods(self):
342	n/a	# Exercising all methods once.
343	n/a	# This must not raise any exceptions
344	n/a	try:
345	n/a	h = hmac.HMAC(b"my secret key", digestmod="md5")
346	n/a	h.update(b"compute the hash of this text!")
347	n/a	dig = h.digest()
348	n/a	dig = h.hexdigest()
349	n/a	h2 = h.copy()
350	n/a	except Exception:
351	n/a	self.fail("Exception raised during normal usage of HMAC class.")
352	n/a
353	n/a	class CopyTestCase(unittest.TestCase):
354	n/a
355	n/a	def test_attributes(self):
356	n/a	# Testing if attributes are of same type.
357	n/a	h1 = hmac.HMAC(b"key", digestmod="md5")
358	n/a	h2 = h1.copy()
359	n/a	self.assertTrue(h1.digest_cons == h2.digest_cons,
360	n/a	"digest constructors don't match.")
361	n/a	self.assertEqual(type(h1.inner), type(h2.inner),
362	n/a	"Types of inner don't match.")
363	n/a	self.assertEqual(type(h1.outer), type(h2.outer),
364	n/a	"Types of outer don't match.")
365	n/a
366	n/a	def test_realcopy(self):
367	n/a	# Testing if the copy method created a real copy.
368	n/a	h1 = hmac.HMAC(b"key", digestmod="md5")
369	n/a	h2 = h1.copy()
370	n/a	# Using id() in case somebody has overridden __eq__/__ne__.
371	n/a	self.assertTrue(id(h1) != id(h2), "No real copy of the HMAC instance.")
372	n/a	self.assertTrue(id(h1.inner) != id(h2.inner),
373	n/a	"No real copy of the attribute 'inner'.")
374	n/a	self.assertTrue(id(h1.outer) != id(h2.outer),
375	n/a	"No real copy of the attribute 'outer'.")
376	n/a
377	n/a	def test_equality(self):
378	n/a	# Testing if the copy has the same digests.
379	n/a	h1 = hmac.HMAC(b"key", digestmod="md5")
380	n/a	h1.update(b"some random text")
381	n/a	h2 = h1.copy()
382	n/a	self.assertEqual(h1.digest(), h2.digest(),
383	n/a	"Digest of copy doesn't match original digest.")
384	n/a	self.assertEqual(h1.hexdigest(), h2.hexdigest(),
385	n/a	"Hexdigest of copy doesn't match original hexdigest.")
386	n/a
387	n/a	class CompareDigestTestCase(unittest.TestCase):
388	n/a
389	n/a	def test_compare_digest(self):
390	n/a	# Testing input type exception handling
391	n/a	a, b = 100, 200
392	n/a	self.assertRaises(TypeError, hmac.compare_digest, a, b)
393	n/a	a, b = 100, b"foobar"
394	n/a	self.assertRaises(TypeError, hmac.compare_digest, a, b)
395	n/a	a, b = b"foobar", 200
396	n/a	self.assertRaises(TypeError, hmac.compare_digest, a, b)
397	n/a	a, b = "foobar", b"foobar"
398	n/a	self.assertRaises(TypeError, hmac.compare_digest, a, b)
399	n/a	a, b = b"foobar", "foobar"
400	n/a	self.assertRaises(TypeError, hmac.compare_digest, a, b)
401	n/a
402	n/a	# Testing bytes of different lengths
403	n/a	a, b = b"foobar", b"foo"
404	n/a	self.assertFalse(hmac.compare_digest(a, b))
405	n/a	a, b = b"\xde\xad\xbe\xef", b"\xde\xad"
406	n/a	self.assertFalse(hmac.compare_digest(a, b))
407	n/a
408	n/a	# Testing bytes of same lengths, different values
409	n/a	a, b = b"foobar", b"foobaz"
410	n/a	self.assertFalse(hmac.compare_digest(a, b))
411	n/a	a, b = b"\xde\xad\xbe\xef", b"\xab\xad\x1d\xea"
412	n/a	self.assertFalse(hmac.compare_digest(a, b))
413	n/a
414	n/a	# Testing bytes of same lengths, same values
415	n/a	a, b = b"foobar", b"foobar"
416	n/a	self.assertTrue(hmac.compare_digest(a, b))
417	n/a	a, b = b"\xde\xad\xbe\xef", b"\xde\xad\xbe\xef"
418	n/a	self.assertTrue(hmac.compare_digest(a, b))
419	n/a
420	n/a	# Testing bytearrays of same lengths, same values
421	n/a	a, b = bytearray(b"foobar"), bytearray(b"foobar")
422	n/a	self.assertTrue(hmac.compare_digest(a, b))
423	n/a
424	n/a	# Testing bytearrays of diffeent lengths
425	n/a	a, b = bytearray(b"foobar"), bytearray(b"foo")
426	n/a	self.assertFalse(hmac.compare_digest(a, b))
427	n/a
428	n/a	# Testing bytearrays of same lengths, different values
429	n/a	a, b = bytearray(b"foobar"), bytearray(b"foobaz")
430	n/a	self.assertFalse(hmac.compare_digest(a, b))
431	n/a
432	n/a	# Testing byte and bytearray of same lengths, same values
433	n/a	a, b = bytearray(b"foobar"), b"foobar"
434	n/a	self.assertTrue(hmac.compare_digest(a, b))
435	n/a	self.assertTrue(hmac.compare_digest(b, a))
436	n/a
437	n/a	# Testing byte bytearray of diffeent lengths
438	n/a	a, b = bytearray(b"foobar"), b"foo"
439	n/a	self.assertFalse(hmac.compare_digest(a, b))
440	n/a	self.assertFalse(hmac.compare_digest(b, a))
441	n/a
442	n/a	# Testing byte and bytearray of same lengths, different values
443	n/a	a, b = bytearray(b"foobar"), b"foobaz"
444	n/a	self.assertFalse(hmac.compare_digest(a, b))
445	n/a	self.assertFalse(hmac.compare_digest(b, a))
446	n/a
447	n/a	# Testing str of same lengths
448	n/a	a, b = "foobar", "foobar"
449	n/a	self.assertTrue(hmac.compare_digest(a, b))
450	n/a
451	n/a	# Testing str of diffeent lengths
452	n/a	a, b = "foo", "foobar"
453	n/a	self.assertFalse(hmac.compare_digest(a, b))
454	n/a
455	n/a	# Testing bytes of same lengths, different values
456	n/a	a, b = "foobar", "foobaz"
457	n/a	self.assertFalse(hmac.compare_digest(a, b))
458	n/a
459	n/a	# Testing error cases
460	n/a	a, b = "foobar", b"foobar"
461	n/a	self.assertRaises(TypeError, hmac.compare_digest, a, b)
462	n/a	a, b = b"foobar", "foobar"
463	n/a	self.assertRaises(TypeError, hmac.compare_digest, a, b)
464	n/a	a, b = b"foobar", 1
465	n/a	self.assertRaises(TypeError, hmac.compare_digest, a, b)
466	n/a	a, b = 100, 200
467	n/a	self.assertRaises(TypeError, hmac.compare_digest, a, b)
468	n/a	a, b = "fooÃ¤", "fooÃ¤"
469	n/a	self.assertRaises(TypeError, hmac.compare_digest, a, b)
470	n/a
471	n/a	# subclasses are supported by ignore __eq__
472	n/a	class mystr(str):
473	n/a	def __eq__(self, other):
474	n/a	return False
475	n/a
476	n/a	a, b = mystr("foobar"), mystr("foobar")
477	n/a	self.assertTrue(hmac.compare_digest(a, b))
478	n/a	a, b = mystr("foobar"), "foobar"
479	n/a	self.assertTrue(hmac.compare_digest(a, b))
480	n/a	a, b = mystr("foobar"), mystr("foobaz")
481	n/a	self.assertFalse(hmac.compare_digest(a, b))
482	n/a
483	n/a	class mybytes(bytes):
484	n/a	def __eq__(self, other):
485	n/a	return False
486	n/a
487	n/a	a, b = mybytes(b"foobar"), mybytes(b"foobar")
488	n/a	self.assertTrue(hmac.compare_digest(a, b))
489	n/a	a, b = mybytes(b"foobar"), b"foobar"
490	n/a	self.assertTrue(hmac.compare_digest(a, b))
491	n/a	a, b = mybytes(b"foobar"), mybytes(b"foobaz")
492	n/a	self.assertFalse(hmac.compare_digest(a, b))
493	n/a
494	n/a
495	n/a	if __name__ == "__main__":
496	n/a	unittest.main()