diff options
| -rw-r--r-- | src/leap/common/crypto.py | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/src/leap/common/crypto.py b/src/leap/common/crypto.py index d7a8457..3d6030b 100644 --- a/src/leap/common/crypto.py +++ b/src/leap/common/crypto.py @@ -15,13 +15,13 @@ # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. +import os +import binascii from Crypto.Cipher import AES -from Crypto.Random import random from Crypto.Util import Counter from leap.common.check import leap_assert, leap_assert_type - # # encryption methods # @@ -70,10 +70,10 @@ def encrypt_sym(data, key, method=EncryptionMethods.AES_256_CTR): leap_assert( len(key) == 32, # 32 x 8 = 256 bits. 'Wrong key size: %s bits (must be 256 bits long).' % (len(key)*8)) - iv = random.getrandbits(256) - ctr = Counter.new(128, initial_value=iv) + iv = os.urandom(8) + ctr = Counter.new(64, prefix=iv) cipher = AES.new(key=key, mode=AES.MODE_CTR, counter=ctr) - return iv, cipher.encrypt(data) + return binascii.b2a_base64(iv), cipher.encrypt(data) # raise if method is unknown raise UnknownEncryptionMethod('Unkwnown method: %s' % method) @@ -106,8 +106,8 @@ def decrypt_sym(data, key, method=EncryptionMethods.AES_256_CTR, **kwargs): leap_assert( 'iv' in kwargs, 'AES-256-CTR needs an initial value given as.') - ctr = Counter.new(128, initial_value=kwargs['iv']) - cipher = AES.new(key, AES.MODE_CTR, counter=ctr) + ctr = Counter.new(64, prefix=binascii.a2b_base64(kwargs['iv'])) + cipher = AES.new(key=key, mode=AES.MODE_CTR, counter=ctr) return cipher.decrypt(data) # raise if method is unknown |