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## -*- coding: utf-8 -*-
# test_crypto.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Tests for the crypto submodule.
"""
import os
import binascii
from leap.common.testing.basetest import BaseLeapTest
from leap.common import crypto
from Crypto import Random
class CryptoTestCase(BaseLeapTest):
def setUp(self):
pass
def tearDown(self):
pass
def test_encrypt_decrypt_sym(self):
# generate 256-bit key
key = Random.new().read(32)
iv, cyphertext = crypto.encrypt_sym(
'data', key,
method=crypto.EncryptionMethods.AES_256_CTR)
self.assertTrue(cyphertext is not None)
self.assertTrue(cyphertext != '')
self.assertTrue(cyphertext != 'data')
plaintext = crypto.decrypt_sym(
cyphertext, key, iv=iv,
method=crypto.EncryptionMethods.AES_256_CTR)
self.assertEqual('data', plaintext)
def test_decrypt_with_wrong_iv_fails(self):
key = Random.new().read(32)
iv, cyphertext = crypto.encrypt_sym(
'data', key,
method=crypto.EncryptionMethods.AES_256_CTR)
self.assertTrue(cyphertext is not None)
self.assertTrue(cyphertext != '')
self.assertTrue(cyphertext != 'data')
# get a different iv by changing the first byte
rawiv = binascii.a2b_base64(iv)
wrongiv = rawiv
while wrongiv == rawiv:
wrongiv = os.urandom(1) + rawiv[1:]
plaintext = crypto.decrypt_sym(
cyphertext, key, iv=binascii.b2a_base64(wrongiv),
method=crypto.EncryptionMethods.AES_256_CTR)
self.assertNotEqual('data', plaintext)
def test_decrypt_with_wrong_key_fails(self):
key = Random.new().read(32)
iv, cyphertext = crypto.encrypt_sym(
'data', key,
method=crypto.EncryptionMethods.AES_256_CTR)
self.assertTrue(cyphertext is not None)
self.assertTrue(cyphertext != '')
self.assertTrue(cyphertext != 'data')
wrongkey = Random.new().read(32) # 256-bits key
# ensure keys are different in case we are extremely lucky
while wrongkey == key:
wrongkey = Random.new().read(32)
plaintext = crypto.decrypt_sym(
cyphertext, wrongkey, iv=iv,
method=crypto.EncryptionMethods.AES_256_CTR)
self.assertNotEqual('data', plaintext)
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