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import Crypto only when needed

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This commit is contained in:
Frank Morgner
2015-05-18 07:28:24 +02:00
parent 2ef0e7828c
commit bca53f92f1
1 changed files with 1 additions and 1 deletions
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2
virtualsmartcard/src/vpicc/virtualsmartcard/CryptoUtils.py
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@@ -17,7 +17,6 @@
# virtualsmartcard. If not, see <http://www.gnu.org/licenses/>. # virtualsmartcard. If not, see <http://www.gnu.org/licenses/>.
# #
import sys, binascii, random, logging import sys, binascii, random, logging
from Crypto.Cipher import DES3, DES, AES, ARC4#@UnusedImport
from struct import pack from struct import pack
from binascii import b2a_hex, a2b_hex from binascii import b2a_hex, a2b_hex
from random import randint from random import randint
@@ -264,6 +263,7 @@ def calculate_MAC(session_key, message, iv=CYBERFLEX_IV):
Cyberflex MAC is the last Block of the input encrypted with DES3-CBC Cyberflex MAC is the last Block of the input encrypted with DES3-CBC
""" """
from Crypto.Cipher import DES3
cipher = DES3.new(session_key, DES3.MODE_CBC, iv) cipher = DES3.new(session_key, DES3.MODE_CBC, iv)
padded = append_padding(8, message, 0x01) padded = append_padding(8, message, 0x01)
block_count = len(padded) / cipher.block_size block_count = len(padded) / cipher.block_size