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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Tests for the encryption manager."""
import unittest
from dfvfs.encryption import decrypter
from dfvfs.encryption import manager
from dfvfs.encryption import rc4_decrypter
from dfvfs.lib import definitions
from dfvfs.lib import errors
from tests import test_lib as shared_test_lib
class TestDecrypter(decrypter.Decrypter):
"""Test decrypter."""
ENCRYPTION_METHOD = 'test'
# pylint: disable=unused-argument
def Decrypt(self, encrypted_data, finalize=False):
"""Decrypt the encrypted data.
Args:
encrypted_data (bytes): the encrypted data.
finalize (Optional[bool]): True if the end of data has been reached and
the cipher context should be finalized.
Returns:
tuple[bytes, bytes]: byte string of the decrypted data and the remaining
encrypted data.
"""
return b'', b''
class EncryptionManagerTest(shared_test_lib.BaseTestCase):
"""Encryption manager tests."""
def testDecrypterRegistration(self):
"""Tests the DeregisterDecrypter and DeregisterDecrypter functions."""
# pylint: disable=protected-access
number_of_decrypters = len(manager.EncryptionManager._decrypters)
manager.EncryptionManager.RegisterDecrypter(TestDecrypter)
self.assertEqual(
len(manager.EncryptionManager._decrypters),
number_of_decrypters + 1)
with self.assertRaises(KeyError):
manager.EncryptionManager.RegisterDecrypter(TestDecrypter)
manager.EncryptionManager.DeregisterDecrypter(TestDecrypter)
self.assertEqual(
len(manager.EncryptionManager._decrypters), number_of_decrypters)
with self.assertRaises(KeyError):
manager.EncryptionManager.DeregisterDecrypter(TestDecrypter)
def testGetDecrypter(self):
"""Function to test the GetDecrypter function."""
try:
decrypter_object = manager.EncryptionManager.GetDecrypter(
definitions.ENCRYPTION_METHOD_RC4, key=b'test1')
except errors.BackEndError:
raise unittest.SkipTest('missing cryptograpy RC4 support')
self.assertIsInstance(decrypter_object, rc4_decrypter.RC4Decrypter)
decrypter_object = manager.EncryptionManager.GetDecrypter('bogus')
self.assertIsNone(decrypter_object)
if __name__ == '__main__':
unittest.main()
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