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import hashlib
import unittest
from django.test import SimpleTestCase, ignore_warnings
from django.utils.crypto import (
InvalidAlgorithm, constant_time_compare, get_random_string, pbkdf2,
salted_hmac,
)
from django.utils.deprecation import RemovedInDjango40Warning
class TestUtilsCryptoMisc(SimpleTestCase):
def test_constant_time_compare(self):
# It's hard to test for constant time, just test the result.
self.assertTrue(constant_time_compare(b'spam', b'spam'))
self.assertFalse(constant_time_compare(b'spam', b'eggs'))
self.assertTrue(constant_time_compare('spam', 'spam'))
self.assertFalse(constant_time_compare('spam', 'eggs'))
def test_salted_hmac(self):
tests = [
((b'salt', b'value'), {}, 'b51a2e619c43b1ca4f91d15c57455521d71d61eb'),
(('salt', 'value'), {}, 'b51a2e619c43b1ca4f91d15c57455521d71d61eb'),
(
('salt', 'value'),
{'secret': 'abcdefg'},
'8bbee04ccddfa24772d1423a0ba43bd0c0e24b76',
),
(
('salt', 'value'),
{'secret': 'x' * hashlib.sha1().block_size},
'bd3749347b412b1b0a9ea65220e55767ac8e96b0',
),
(
('salt', 'value'),
{'algorithm': 'sha256'},
'ee0bf789e4e009371a5372c90f73fcf17695a8439c9108b0480f14e347b3f9ec',
),
(
('salt', 'value'),
{
'algorithm': 'blake2b',
'secret': 'x' * hashlib.blake2b().block_size,
},
'fc6b9800a584d40732a07fa33fb69c35211269441823bca431a143853c32f'
'e836cf19ab881689528ede647dac412170cd5d3407b44c6d0f44630690c54'
'ad3d58',
),
]
for args, kwargs, digest in tests:
with self.subTest(args=args, kwargs=kwargs):
self.assertEqual(salted_hmac(*args, **kwargs).hexdigest(), digest)
def test_invalid_algorithm(self):
msg = "'whatever' is not an algorithm accepted by the hashlib module."
with self.assertRaisesMessage(InvalidAlgorithm, msg):
salted_hmac('salt', 'value', algorithm='whatever')
class TestUtilsCryptoPBKDF2(unittest.TestCase):
# http://tools.ietf.org/html/draft-josefsson-pbkdf2-test-vectors-06
rfc_vectors = [
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": "0c60c80f961f0e71f3a9b524af6012062fe037a6",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 2,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": "ea6c014dc72d6f8ccd1ed92ace1d41f0d8de8957",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 4096,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": "4b007901b765489abead49d926f721d065a429c1",
},
# # this takes way too long :(
# {
# "args": {
# "password": "password",
# "salt": "salt",
# "iterations": 16777216,
# "dklen": 20,
# "digest": hashlib.sha1,
# },
# "result": "eefe3d61cd4da4e4e9945b3d6ba2158c2634e984",
# },
{
"args": {
"password": "passwordPASSWORDpassword",
"salt": "saltSALTsaltSALTsaltSALTsaltSALTsalt",
"iterations": 4096,
"dklen": 25,
"digest": hashlib.sha1,
},
"result": "3d2eec4fe41c849b80c8d83662c0e44a8b291a964cf2f07038",
},
{
"args": {
"password": "pass\0word",
"salt": "sa\0lt",
"iterations": 4096,
"dklen": 16,
"digest": hashlib.sha1,
},
"result": "56fa6aa75548099dcc37d7f03425e0c3",
},
]
regression_vectors = [
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha256,
},
"result": "120fb6cffcf8b32c43e7225256c4f837a86548c9",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha512,
},
"result": "867f70cf1ade02cff3752599a3a53dc4af34c7a6",
},
{
"args": {
"password": "password",
"salt": "salt",
"iterations": 1000,
"dklen": 0,
"digest": hashlib.sha512,
},
"result": ("afe6c5530785b6cc6b1c6453384731bd5ee432ee"
"549fd42fb6695779ad8a1c5bf59de69c48f774ef"
"c4007d5298f9033c0241d5ab69305e7b64eceeb8d"
"834cfec"),
},
# Check leading zeros are not stripped (#17481)
{
"args": {
"password": b'\xba',
"salt": "salt",
"iterations": 1,
"dklen": 20,
"digest": hashlib.sha1,
},
"result": '0053d3b91a7f1e54effebd6d68771e8a6e0b2c5b',
},
]
def test_public_vectors(self):
for vector in self.rfc_vectors:
result = pbkdf2(**vector['args'])
self.assertEqual(result.hex(), vector['result'])
def test_regression_vectors(self):
for vector in self.regression_vectors:
result = pbkdf2(**vector['args'])
self.assertEqual(result.hex(), vector['result'])
def test_default_hmac_alg(self):
kwargs = {'password': b'password', 'salt': b'salt', 'iterations': 1, 'dklen': 20}
self.assertEqual(pbkdf2(**kwargs), hashlib.pbkdf2_hmac(hash_name=hashlib.sha256().name, **kwargs))
class DeprecationTests(SimpleTestCase):
@ignore_warnings(category=RemovedInDjango40Warning)
def test_get_random_string(self):
self.assertEqual(len(get_random_string()), 12)
def test_get_random_string_warning(self):
msg = 'Not providing a length argument is deprecated.'
with self.assertRaisesMessage(RemovedInDjango40Warning, msg):
get_random_string()
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