89 lines
2.5 KiB
Python
89 lines
2.5 KiB
Python
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# This file is part of 'NTLM Authorization Proxy Server' http://sourceforge.net/projects/ntlmaps/
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# Copyright 2001 Dmitry A. Rozmanov <dima@xenon.spb.ru>
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#
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# This library is free software: you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation, either
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# version 3 of the License, or (at your option) any later version.
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library. If not, see <http://www.gnu.org/licenses/> or <http://www.gnu.org/licenses/lgpl.txt>.
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import logging
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import six
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from ntlm_auth import des_c
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log = logging.getLogger(__name__)
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class DES:
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des_c_obj = None
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def __init__(self, key_str):
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k = str_to_key56(key_str)
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k = key56_to_key64(k)
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key_str = b''
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for i in k:
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key_str += six.int2byte(i & 0xFF)
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self.des_c_obj = des_c.DES(key_str)
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def encrypt(self, plain_text):
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return self.des_c_obj.encrypt(plain_text)
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def decrypt(self, crypted_text):
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return self.des_c_obj.decrypt(crypted_text)
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DESException = 'DESException'
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def str_to_key56(key_str):
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if not type(key_str) == six.binary_type:
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# TODO rsanders high - figure out how to make this not necessary
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key_str = key_str.encode('ascii')
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if len(key_str) < 7:
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key_str = key_str + b'\000\000\000\000\000\000\000'[:(7 - len(key_str))]
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key_56 = []
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for i in six.iterbytes(key_str[:7]):
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key_56.append(i)
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return key_56
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def key56_to_key64(key_56):
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key = []
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for i in range(8):
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key.append(0)
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key[0] = key_56[0]
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key[1] = ((key_56[0] << 7) & 0xFF) | (key_56[1] >> 1)
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key[2] = ((key_56[1] << 6) & 0xFF) | (key_56[2] >> 2)
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key[3] = ((key_56[2] << 5) & 0xFF) | (key_56[3] >> 3)
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key[4] = ((key_56[3] << 4) & 0xFF) | (key_56[4] >> 4)
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key[5] = ((key_56[4] << 3) & 0xFF) | (key_56[5] >> 5)
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key[6] = ((key_56[5] << 2) & 0xFF) | (key_56[6] >> 6)
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key[7] = (key_56[6] << 1) & 0xFF
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key = set_key_odd_parity(key)
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return key
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def set_key_odd_parity(key):
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for i in range(len(key)):
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for k in range(7):
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bit = 0
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t = key[i] >> k
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bit = (t ^ bit) & 0x1
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key[i] = (key[i] & 0xFE) | bit
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return key
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