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| -rw-r--r-- | combox/combox.py | 243 |
1 files changed, 0 insertions, 243 deletions
diff --git a/combox/combox.py b/combox/combox.py deleted file mode 100644 index 3f15dd5..0000000 --- a/combox/combox.py +++ /dev/null @@ -1,243 +0,0 @@ -# Copyright (C) 2014 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 base64 -import os -import yaml -import getpass -import hashlib -import sys -import stat - -from Crypto.Cipher import AES -from os import path -from sys import exit -from glob import glob - - -#### Start of combox config function - -def config_cb(): - """ - Configure combox, if not already configured. - """ - # First whether combox is already configured. - config_dir = os.path.join(os.getenv('HOME'),'.combox/') - if not os.path.exists(config_dir): - # Create combox dir and configure. - os.mkdir(config_dir, 0700) - config_file_path = os.path.join(config_dir, 'config.yaml') - config_info = {} - - config_info['combox_dir'] = raw_input('path to combox directory: ') - config_info['topsecret'] = hashlib.sha224(getpass.getpass('passphrase: ')).hexdigest() - - no_nodes = int(raw_input('number of nodes: ')) - - nodes = {} - for i in range(no_nodes): - node_name = raw_input('node %d name: ' % i) - nodes[node_name] = {} - nodes[node_name]['path'] = raw_input('node %d path: ' % i) - nodes[node_name]['size'] = raw_input('node %d size (in mega bytes): ' % i) - nodes[node_name]['available'] = nodes[node_name]['size'] - - config_info['nodes_info'] = nodes - config_file = open(config_file_path, 'w') - yaml.dump(config_info, config_file, default_flow_style=False) - os.chmod(config_file_path,stat.S_IRUSR|stat.S_IWUSR) - else: - # should put something here later - pass - -#### End of combox config function - - - - -#### Start of crypto functions. -def pad(data): - """Pad data such that its length is a multiple of BLOCK_SIZE. - """ - - padding = (BLOCK_SIZE - (len(data) % BLOCK_SIZE)) * PAD_CHAR - data += padding - - return data - - -def encrypt(data, secret): - """Encrypt byestream and return cipher. - """ - aes = AES.new(pad(secret)) - cipher = base64.b64encode(aes.encrypt(pad(data))) - - return cipher - - -def decrypt(cipher, secret): - """Decrypt cipher and return data. - """ - aes = AES.new(pad(secret)) - data = aes.decrypt(base64.b64decode(cipher)).rstrip(PAD_CHAR) - - return data - -def encrypt_shards(shards, secret): - """Encrypt the shards of data and return a list of ciphers. - - shards: list of shards (string, bytes). - secret: top secret passphrase - """ - - ciphers = [] - for shard in shards: - cipher = encrypt(shard, secret) - ciphers.append(cipher) - - return ciphers - - -def decrypt_shards(ciphers, secret): - """Decrypt the ciphered shards and return a list of shards. - - shards: list of ciphered shards. - secret: top secret passphrase - """ - - shards = [] - for cipher in ciphers: - shard = decrypt(cipher, secret) - shards.append(shard) - - return shards - -#### End of crypto functions. - - - -#### Start of File related functions - -def split_data(data, n): - """Split data into `n' parts and return them as an array. - - data: Stream of bytes or string - n: Number of parts the file has to be split. - """ - - d_parts = [] - # File size in bytes. - data_size = len(data) - # No. of bytes for each data part. - part_size = data_size / n - # Take note of remaining bytes; this is non-zero when data_size is - # not divisible by `n'. - rem_bytes = data_size % n - - start = 0 - end = part_size - while end <= data_size: - d_parts.append(data[start:end]) - start = end - end = end + part_size - - # read the remaining bytes into the last data part. - end += start + rem_bytes - d_parts[n-1] += data[start:end] - - return d_parts - - -def glue_data(d_parts): - """Glue different parts of the data to one. - - d_parts: Array containing different parts of the data. Each part - is a sequence of bytes. - """ - - data = '' - for part in d_parts: - data += part - - return data - - -def read_file(filename): - """Read file and return it as a string. - - filename: Absolute pathname of the file. - """ - file_ = None - try: - file_ = open(filename, 'rb') - except IOError: - print "ERROR: opening %s" % (filename) - exit(1) - - return file_.read() - - -def write_file(filename, filecontent): - """Write `filecontent' to `filename'. - - filename: Absolute pathname of the file. - filecontent: String/bytstream to write to filename. - """ - file_ = None - try: - file_ = open(filename, 'wb') - file_.write(filecontent) - except IOError: - print "ERROR: creating and writing content to %s" % (filename) - exit(1) - -def write_shards(shards, directory, shard_basename): - """Write shards to respective files respective files. - - shard: list of strings (ciphers or data). - directory: absolute path of directory to which it shards must be written to. - shard_basename: base name of the shard. - """ - - # partial filename of the shard - p_filename = path.join(directory, shard_basename) - shard_no = 0 - for shard in shards: - shard_name = "%s.shard%s" % (p_filename, shard_no) - write_file(shard_name, shard) - shard_no += 1 - -def read_shards(directory, shard_basename): - """Read the shards from directory and return it as a list. - - directory: absolute path of directory from which to read the shards. - shard_basename: base name of the shard. - """ - - shards = [] - # partial filename of the shard - p_filename = "%s.shard*" % path.join(directory, shard_basename) - for shard_file in sorted(glob(p_filename)): - shard_content = read_file(shard_file) - shards.append(shard_content) - - return shards - - - -#### End of File related functions. |