mirror of
https://github.com/noDRM/DeDRM_tools.git
synced 2025-10-23 23:07:47 -04:00
30 lines
858 B
Python
30 lines
858 B
Python
#!/usr/bin/env python
|
|
# vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab
|
|
|
|
|
|
def load_pycrypto():
|
|
try :
|
|
from Crypto.Cipher import DES as _DES
|
|
except:
|
|
return None
|
|
|
|
class DES(object):
|
|
def __init__(self, key):
|
|
if len(key) != 8 :
|
|
raise ValueError('DES improper key used')
|
|
self.key = key
|
|
self._des = _DES.new(key,_DES.MODE_ECB)
|
|
def desdecrypt(self, data):
|
|
return self._des.decrypt(data)
|
|
def decrypt(self, data):
|
|
if not data:
|
|
return ''
|
|
i = 0
|
|
result = []
|
|
while i < len(data):
|
|
block = data[i:i+8]
|
|
processed_block = self.desdecrypt(block)
|
|
result.append(processed_block)
|
|
i += 8
|
|
return ''.join(result)
|
|
return DES
|