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import testtools
from keystoneclient.middleware import memcache_crypt
class MemcacheCryptPositiveTests(testtools.TestCase):
def _setup_keys(self, strategy):
return memcache_crypt.derive_keys('token', 'secret', strategy)
def test_constant_time_compare(self):
# make sure it works as a compare, the "constant time" aspect
# isn't appropriate to test in unittests
ctc = memcache_crypt.constant_time_compare
self.assertTrue(ctc('abcd', 'abcd'))
self.assertTrue(ctc('', ''))
self.assertFalse(ctc('abcd', 'efgh'))
self.assertFalse(ctc('abc', 'abcd'))
self.assertFalse(ctc('abc', 'abc\x00'))
self.assertFalse(ctc('', 'abc'))
def test_derive_keys(self):
keys = memcache_crypt.derive_keys('token', 'secret', 'strategy')
self.assertEqual(len(keys['ENCRYPTION']),
len(keys['CACHE_KEY']))
self.assertEqual(len(keys['CACHE_KEY']),
len(keys['MAC']))
self.assertNotEqual(keys['ENCRYPTION'],
keys['MAC'])
self.assertIn('strategy', keys.keys())
def test_key_strategy_diff(self):
k1 = self._setup_keys('MAC')
k2 = self._setup_keys('ENCRYPT')
self.assertNotEqual(k1, k2)
def test_sign_data(self):
keys = self._setup_keys('MAC')
sig = memcache_crypt.sign_data(keys['MAC'], 'data')
self.assertEqual(len(sig), memcache_crypt.DIGEST_LENGTH_B64)
def test_encryption(self):
keys = self._setup_keys('ENCRYPT')
# what you put in is what you get out
for data in ['data', '1234567890123456', '\x00\xFF' * 13
] + [chr(x % 256) * x for x in range(768)]:
crypt = memcache_crypt.encrypt_data(keys['ENCRYPTION'], data)
decrypt = memcache_crypt.decrypt_data(keys['ENCRYPTION'], crypt)
self.assertEqual(data, decrypt)
self.assertRaises(memcache_crypt.DecryptError,
memcache_crypt.decrypt_data,
keys['ENCRYPTION'], crypt[:-1])
def test_protect_wrappers(self):
data = 'My Pretty Little Data'
for strategy in ['MAC', 'ENCRYPT']:
keys = self._setup_keys(strategy)
protected = memcache_crypt.protect_data(keys, data)
self.assertNotEqual(protected, data)
if strategy == 'ENCRYPT':
self.assertNotIn(data, protected)
unprotected = memcache_crypt.unprotect_data(keys, protected)
self.assertEqual(data, unprotected)
self.assertRaises(memcache_crypt.InvalidMacError,
memcache_crypt.unprotect_data,
keys, protected[:-1])
self.assertIsNone(memcache_crypt.unprotect_data(keys, None))
def test_no_pycrypt(self):
aes = memcache_crypt.AES
memcache_crypt.AES = None
self.assertRaises(memcache_crypt.CryptoUnavailableError,
memcache_crypt.encrypt_data, 'token', 'secret',
'data')
memcache_crypt.AES = aes
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