mirror of
https://github.com/MikroWizard/mikroman.git
synced 2025-07-04 11:04:33 +02:00
97 lines
3.1 KiB
Python
97 lines
3.1 KiB
Python
# This file is part of 'NTLM Authorization Proxy Server' http://sourceforge.net/projects/ntlmaps/
|
|
# Copyright 2001 Dmitry A. Rozmanov <dima@xenon.spb.ru>
|
|
#
|
|
# This library is free software: you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation, either
|
|
# version 3 of the License, or (at your option) any later version.
|
|
|
|
# This library is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
# Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with this library. If not, see <http://www.gnu.org/licenses/> or <http://www.gnu.org/licenses/lgpl.txt>.
|
|
from . import des_c
|
|
|
|
|
|
# ---------------------------------------------------------------------
|
|
class DES:
|
|
des_c_obj = None
|
|
|
|
# -----------------------------------------------------------------
|
|
def __init__(self, key_str):
|
|
""""""
|
|
k = str_to_key56(key_str)
|
|
k = key56_to_key64(k)
|
|
key_str = b""
|
|
for i in k:
|
|
key_str += bytes((i & 0xFF,))
|
|
self.des_c_obj = des_c.DES(key_str)
|
|
|
|
# -----------------------------------------------------------------
|
|
def encrypt(self, plain_text):
|
|
""""""
|
|
return self.des_c_obj.encrypt(plain_text)
|
|
|
|
# -----------------------------------------------------------------
|
|
def decrypt(self, crypted_text):
|
|
""""""
|
|
return self.des_c_obj.decrypt(crypted_text)
|
|
|
|
|
|
# ---------------------------------------------------------------------
|
|
# Some Helpers
|
|
# ---------------------------------------------------------------------
|
|
|
|
DESException = "DESException"
|
|
|
|
|
|
# ---------------------------------------------------------------------
|
|
def str_to_key56(key_str):
|
|
""""""
|
|
if type(key_str) != type(""):
|
|
# rise DESException, 'ERROR. Wrong key type.'
|
|
pass
|
|
if len(key_str) < 7:
|
|
key_str = key_str + b"\000\000\000\000\000\000\000"[: (7 - len(key_str))]
|
|
key_56 = []
|
|
for i in key_str[:7]:
|
|
key_56.append(i)
|
|
|
|
return key_56
|
|
|
|
|
|
# ---------------------------------------------------------------------
|
|
def key56_to_key64(key_56):
|
|
""""""
|
|
key = []
|
|
for i in range(8):
|
|
key.append(0)
|
|
|
|
key[0] = key_56[0]
|
|
key[1] = ((key_56[0] << 7) & 0xFF) | (key_56[1] >> 1)
|
|
key[2] = ((key_56[1] << 6) & 0xFF) | (key_56[2] >> 2)
|
|
key[3] = ((key_56[2] << 5) & 0xFF) | (key_56[3] >> 3)
|
|
key[4] = ((key_56[3] << 4) & 0xFF) | (key_56[4] >> 4)
|
|
key[5] = ((key_56[4] << 3) & 0xFF) | (key_56[5] >> 5)
|
|
key[6] = ((key_56[5] << 2) & 0xFF) | (key_56[6] >> 6)
|
|
key[7] = (key_56[6] << 1) & 0xFF
|
|
|
|
key = set_key_odd_parity(key)
|
|
|
|
return key
|
|
|
|
|
|
# ---------------------------------------------------------------------
|
|
def set_key_odd_parity(key):
|
|
""""""
|
|
for i in range(len(key)):
|
|
for k in range(7):
|
|
bit = 0
|
|
t = key[i] >> k
|
|
bit = (t ^ bit) & 0x1
|
|
key[i] = (key[i] & 0xFE) | bit
|
|
|
|
return key
|