104 lines
3.2 KiB
Python
104 lines
3.2 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8; -*-
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"""
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* Copyright 2014 Alexandre Possebom
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* Copyright 2014 Red Dye No. 2
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* Copyright (C) 2011-2013 TG Byte Software GmbH
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* Copyright (C) 2009-2011 Thilo-Alexander Ginkel.
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* Copyright (C) 2010-2014 Eric Woodruff
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* Copyright (C) 2006-2010 Steve Cooper
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This file is part of twik.
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Twik is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Twik 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Twik. If not, see <http://www.gnu.org/licenses/>.
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"""
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import argparse
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import base64
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import getpass
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import hmac
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import sys
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from hashlib import sha1
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from .util import Util
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class Twik(object):
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def injectcharacter(self, mhash, offset, reserved, seed, length, cstart, cnum):
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pos0 = seed % length
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pos = (pos0 + offset) % length
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for i in range(0, length - reserved):
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tmp = (pos0 + reserved + i) % length
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char = ord(mhash[tmp])
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if char >= ord(cstart) and char < ord(cstart) + cnum:
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return mhash
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head = mhash[:pos] if pos > 0 else ''
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inject = ((seed + ord(mhash[pos])) % cnum) + ord(cstart)
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tail = mhash[pos+1:] if (pos + 1 < len(mhash)) else mhash
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return head + chr(inject) + tail
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def removespecialcharacters(self, mhash, seed, length):
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inputchars = list(mhash)
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pivot = 0
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for i in range(0, length):
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if not inputchars[i].isdigit() and not inputchars[i].isalpha():
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inputchars[i] = chr(((seed + pivot) % 26 + ord('A')))
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pivot = i + 1
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return ''.join(inputchars)
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def converttodigits(self, mhash, seed, length):
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inputchars = list(mhash)
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pivot = 0
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for i in range(0, length):
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if not inputchars[i].isdigit():
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inputchars[i] = chr(((seed + ord(inputchars[pivot])) % 10 +
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ord('0')))
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pivot = i + 1
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return ''.join(inputchars)
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def generatehash(self, tag, key, length, password_type):
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digest = hmac.new(str.encode(key), str.encode(tag), sha1).digest()
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mhash = base64.b64encode(digest)[:-1]
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mhash = mhash.decode('utf-8')
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seed = sum([ord(i) for i in mhash])
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# NUMERIC
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if password_type == 3:
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mhash = self.converttodigits(mhash, seed, length)
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else:
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mhash = self.injectcharacter(mhash, 0, 4, seed, length, '0', 10)
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# ALPHANUMERIC_AND_SPECIAL_CHARS
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if password_type == 1:
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mhash = self.injectcharacter(mhash, 1, 4, seed, length, '!', 15)
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mhash = self.injectcharacter(mhash, 2, 4, seed, length, 'A', 26)
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mhash = self.injectcharacter(mhash, 3, 4, seed, length, 'a', 26)
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# ALPHANUMERIC
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if password_type == 2:
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mhash = self.removespecialcharacters(mhash, seed, length)
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return mhash[:length]
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def getpassword(self, tag, private_key, master_key, length, password_type):
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if length > 26 or length < 4:
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return None
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mhash = self.generatehash(private_key, tag, 24, 1)
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password = self.generatehash(mhash, master_key, length, password_type)
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return password
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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