voussoir
/
megapy
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Decrypt now shared folders/files that do not belong to us

master
Julien LE JEUNE 2013-02-28 08:50:57 +01:00
parent 63d39dd8cd
commit fc8a03d649
1 changed files with 56 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
mega/mega.py
View File

@ -101,28 +101,69 @@ class Mega(object):
def process_file(self, file):
"""
Process a file...
Process a file
"""
if file['t'] == 0 or file['t'] == 1:
key = file['k'][file['k'].index(':') + 1:]
#fix for shared folder key format {k: foo1:bar1/foo2:bar2 }
uid = file['u']
keys = file['k'].split('/')
regex = re.compile('^%s:.*$' % uid)
key = None
for keytmp in keys:
if regex.match(keytmp):
key = keytmp[keytmp.index(':') + 1:]
break
# my objects
if key:
key = decrypt_key(base64_to_a32(key), self.master_key)
# file
if file['t'] == 0:
k = (key[0] ^ key[4], key[1] ^ key[5], key[2] ^ key[6],
key[3] ^ key[7])
file['iv'] = key[4:6] + (0, 0)
file['meta_mac'] = key[6:8]
# folder
else:
k = key
attributes = base64_url_decode(file['a'])
attributes = decrypt_attr(attributes, k)
file['a'] = attributes
# shared folders
elif 'su' in file and 'sk' in file and ':' in file['k']:
user_key = decrypt_key(base64_to_a32(file['sk']),
self.master_key)
key = decrypt_key(base64_to_a32(file['k'].split(':')[1]),
user_key)
# save user_key to decrypt shared files
self.users_keys[file['su']] = user_key
if file['t'] == 0:
k = (key[0] ^ key[4], key[1] ^ key[5], key[2] ^ key[6],
key[3] ^ key[7])
file['iv'] = key[4:6] + (0, 0)
file['meta_mac'] = key[6:8]
else:
k = file['k'] = key
k = key
attributes = base64_url_decode(file['a'])
attributes = decrypt_attr(attributes, k)
file['a'] = attributes
# shared files
elif file['u'] and ':' in file['k']:
user_key = self.users_keys[file['u']]
key = decrypt_key(base64_to_a32(file['k'].split(':')[1]),
user_key)
if file['t'] == 0:
k = (key[0] ^ key[4], key[1] ^ key[5], key[2] ^ key[6],
key[3] ^ key[7])
file['iv'] = key[4:6] + (0, 0)
file['meta_mac'] = key[6:8]
else:
k = key
attributes = base64_url_decode(file['a'])
attributes = decrypt_attr(attributes, k)
file['a'] = attributes
# other => wrong object
elif file['k'] == '':
file['a'] = False
elif file['t'] == 2:
self.root_id = file['h']
file['a'] = {'n': 'Cloud Drive'}