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Code Issues Releases Wiki Activity

Various key file improvements

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This commit is contained in:
Jonas Borgström 2013-06-20 13:42:10 +02:00
parent e22fcdc011
commit 0e5bed3ae5
1 changed files with 7 additions and 9 deletions
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16
darc/key.py
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@ -4,6 +4,7 @@
import msgpack
import shutil
import tempfile
import textwrap
import unittest
import hmac
from hashlib import sha256
@ -182,8 +183,6 @@ class KeyfileKey(AESKeyBase):
FILE_ID = 'DARC KEY'
TYPE = KEYFILE
IV = PREFIX + long_to_bytes(1)
@classmethod
def detect(cls, repository, manifest_data):
key = cls()
@ -226,25 +225,24 @@ def load(self, filename, passphrase):
def decrypt_key_file(self, data, passphrase):
d = msgpack.unpackb(data)
assert d[b'version'] == 1
assert d[b'algorithm'] == b'SHA256'
assert d[b'algorithm'] == b'sha256'
key = pbkdf2_sha256(passphrase.encode('utf-8'), d[b'salt'], d[b'iterations'], 32)
data = AES(key, self.IV).decrypt(d[b'data'])
data = AES(key).decrypt(d[b'data'])
if HMAC(key, data, sha256).digest() != d[b'hash']:
return None
return data
def encrypt_key_file(self, data, passphrase):
salt = get_random_bytes(32)
iterations = 10000
iterations = 100000
key = pbkdf2_sha256(passphrase.encode('utf-8'), salt, iterations, 32)
hash = HMAC(key, data, sha256).digest()
cdata = AES(key, self.IV).encrypt(data)
# cdata = AES.new(key, AES.MODE_CTR, counter=Counter.new(128)).encrypt(data)
cdata = AES(key).encrypt(data)
d = {
'version': 1,
'salt': salt,
'iterations': iterations,
'algorithm': 'SHA256',
'algorithm': 'sha256',
'hash': hash,
'data': cdata,
}
@ -262,7 +260,7 @@ def save(self, path, passphrase):
data = self.encrypt_key_file(msgpack.packb(key), passphrase)
with open(path, 'w') as fd:
fd.write('%s %s\n' % (self.FILE_ID, hexlify(self.repository_id).decode('ascii')))
fd.write(b2a_base64(data).decode('ascii'))
fd.write('\n'.join(textwrap.wrap(b2a_base64(data).decode('ascii'))))
self.path = path
def change_passphrase(self):