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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Tests for the triple DES decrypter object."""
from __future__ import unicode_literals
import unittest
from dfvfs.encryption import des3_decrypter
from dfvfs.lib import definitions
from tests.encryption import test_lib
class DES3DecrypterTestCase(test_lib.DecrypterTestCase):
"""Tests for the triple DES decrypter object."""
_DES3_INITIALIZATION_VECTOR = b'This IV!'
_DES3_KEY = b'This is a key123'
def testInitialization(self):
"""Tests the initialization method."""
# Test missing arguments.
with self.assertRaises(ValueError):
des3_decrypter.DES3Decrypter()
# Test unsupported block cipher mode.
with self.assertRaises(ValueError):
des3_decrypter.DES3Decrypter(
cipher_mode='bogus', key=self._DES3_KEY)
# Test missing initialization vector.
with self.assertRaises(ValueError):
des3_decrypter.DES3Decrypter(
cipher_mode=definitions.ENCRYPTION_MODE_CBC, key=self._DES3_KEY)
# Test missing initialization vector with valid block cipher mode.
des3_decrypter.DES3Decrypter(
cipher_mode=definitions.ENCRYPTION_MODE_ECB, key=self._DES3_KEY)
# Test incorrect key size.
with self.assertRaises(ValueError):
des3_decrypter.DES3Decrypter(
cipher_mode=definitions.ENCRYPTION_MODE_ECB, key=b'Wrong key size')
# Test incorrect initialization vector type.
with self.assertRaises(TypeError):
des3_decrypter.DES3Decrypter(
cipher_mode=definitions.ENCRYPTION_MODE_CBC,
initialization_vector='Wrong IV type', key=self._DES3_KEY)
# Test incorrect initialization vector size.
with self.assertRaises(ValueError):
des3_decrypter.DES3Decrypter(
cipher_mode=definitions.ENCRYPTION_MODE_CBC,
initialization_vector=b'Wrong IV size', key=self._DES3_KEY)
def testDecrypt(self):
"""Tests the Decrypt method."""
decrypter = des3_decrypter.DES3Decrypter(
cipher_mode=definitions.ENCRYPTION_MODE_CBC,
initialization_vector=self._DES3_INITIALIZATION_VECTOR,
key=self._DES3_KEY)
# Test full decryption.
expected_decrypted_data = b'This is secret encrypted text!!!'
decrypted_data, remaining_encrypted_data = decrypter.Decrypt(
b'e\x86k\t\x01W\xd7d\xe4\xa4\xb3~\x80\xd3\xc3\x7fq{E}:L\n '
b'.2\xd1\xcf\x8a\xf1\xa0!', finalize=True)
self.assertEqual(decrypted_data, expected_decrypted_data)
self.assertEqual(remaining_encrypted_data, b'')
# Reset decrypter.
decrypter = des3_decrypter.DES3Decrypter(
cipher_mode=definitions.ENCRYPTION_MODE_CBC,
initialization_vector=self._DES3_INITIALIZATION_VECTOR,
key=self._DES3_KEY)
# Test partial decryption.
partial_encrypted_data = b'e\x86k\t\x01W\xd7d\xe4\xa4\xb3~\x80'
decrypted_data, remaining_encrypted_data = decrypter.Decrypt(
partial_encrypted_data)
self.assertEqual(decrypted_data, b'')
self.assertEqual(remaining_encrypted_data, partial_encrypted_data)
if __name__ == '__main__':
unittest.main()
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