added back combox/config.py and combox/crypto.py

2 files changed, 166 insertions, 0 deletions

diff --git a/combox/config.py b/combox/config.py
new file mode 100644
index 0000000..adaecf5
--- /dev/null
+++ b/combox/config.py
@@ -0,0 +1,82 @@
+#    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/>.
+
+##################################################
+## YAML Config format
+##################################################
+##
+## combox_dir: path/to/combox/
+##
+## topsecret: dba0079f1cb3a3b56e102dd5e04fa2af
+##
+## nodes_info:
+##  node_name:
+##      path: path/to/shard1/dir/
+##      size: 1000 # in MB
+##      available: 500 # in MB
+##  node name:
+##      path: path/to/shard2/dir/
+##      size: 2000
+##      available: 1500
+##  node name:
+##      path: path/to/shard3/dir
+##      size: 3000
+##      available: 1500
+##
+##################################################
+
+import os
+import yaml
+import getpass
+import hashlib
+import sys
+import stat
+
+
+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
diff --git a/combox/crypto.py b/combox/crypto.py
new file mode 100644
index 0000000..3f17cc0
--- /dev/null
+++ b/combox/crypto.py
@@ -0,0 +1,84 @@
+#    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/>.
+
+## Adapted from https://gist.github.com/sekondus/4322469
+
+import base64
+import os
+
+from Crypto.Cipher import AES
+
+BLOCK_SIZE = 32
+PAD_CHAR = '#'
+
+
+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