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# Copyright (C) 2015 Combox author(s). See AUTHORS.
#
# This file is part of Combox.
#
# Combox 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.
#
# Combox 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 Combox (see COPYING). If not, see
# <http://www.gnu.org/licenses/>.
import yaml
from filecmp import cmp
from glob import glob
from nose.tools import *
from os import path, remove
from shutil import copyfile
from combox.config import get_nodedirs
from combox.crypto import *
from combox.file import *
from tests.utils import get_config, rm_nodedirs, rm_configdir
class TestCrypto(object):
"""
Class that tests the crypto.py module.
"""
@classmethod
def setup_class(self):
"""Set things up."""
self.config = get_config()
FILES_DIR = self.config['combox_dir']
self.TEST_FILE = path.join(FILES_DIR,'thgttg-21st.png')
# create a copy of TEST_FILE (for later comparision)
self.TEST_FILE_COPY = "%s.copy" % self.TEST_FILE
copyfile(self.TEST_FILE, self.TEST_FILE_COPY)
def test_encryption(self):
""" Read file, encrypt it to a cipher, write cipher to file, read
encrypted file, decrypt it, write decrypted data to file.
"""
f = path.abspath(self.TEST_FILE)
f_content = read_file(f)
# encrypt
f_cipher = encrypt(f_content, self.config['topsecret'])
# decrypt
f_content_decrypted = decrypt(f_cipher, self.config['topsecret'])
assert f_content == f_content_decrypted
def test_split_encryption(self):
"""Read file, split it, encrypt shards, write encrypted shards to
file, read encrypted shards from file, decrypt the encrypted shards,
glue the shards together, write glued data to file.
"""
# no. of shards = no. of nodes
SHARDS = len(self.config['nodes_info'].keys())
f = path.abspath(self.TEST_FILE)
f_content = read_file(f)
f_shards = split_data(f_content, SHARDS)
# encrypt shards
ciphered_shards = encrypt_shards(f_shards, self.config['topsecret'])
# write ciphered shards to disk
# f_basename = path.basename(f)
f_basename = relative_path(f, self.config)
nodes = get_nodedirs(self.config)
write_shards(ciphered_shards, nodes, f_basename)
# read ciphered shards from disk
ciphered_shards = read_shards(nodes, f_basename)
# decrypt shards
f_parts = decrypt_shards(ciphered_shards, self.config['topsecret'])
# glue them shards together
f_content_glued = glue_data(f_parts)
assert f_content == f_content_glued
def test_convenience_crypto(self):
"""
Tests convenience crypto function(s) - split_and_encrypt, decrypt and glue.
"""
# splits file into shards, writes encrypted shards to respective
# node directories.
split_and_encrypt(self.TEST_FILE, self.config)
# reads encrypted shards from node directories, glues them and
# writes decrypted back to combox directory.
os.remove(self.TEST_FILE)
decrypt_and_glue(self.TEST_FILE, self.config, write=False)
assert not path.exists(self.TEST_FILE)
decrypt_and_glue(self.TEST_FILE, self.config)
assert path.exists(self.TEST_FILE)
assert cmp(self.TEST_FILE, self.TEST_FILE_COPY, False)
@classmethod
def teardown_class(self):
"""Purge the mess created by this test"""
rm_shards(self.TEST_FILE, self.config)
remove(self.TEST_FILE_COPY)
rm_nodedirs(self.config)
rm_configdir()
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