Created
May 28, 2014 13:50
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generte a unix-shadow-compatible password on systems with python <3.3
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#!/usr/bin/python | |
# Wrapper to the POSIX crypt library call and associated functionality. | |
import sys | |
import crypt as _crypt | |
import string as _string | |
from random import SystemRandom as _SystemRandom | |
from collections import namedtuple as _namedtuple | |
_saltchars = _string.ascii_letters + _string.digits + './' | |
_sr = _SystemRandom() | |
class _Method(_namedtuple('_Method', 'name ident salt_chars total_size')): | |
"""Class representing a salt method per the Modular Crypt Format or the | |
legacy 2-character crypt method.""" | |
def __repr__(self): | |
return '<crypt.METHOD_{}>'.format(self.name) | |
def mksalt(method=None): | |
"""Generate a salt for the specified method. | |
If not specified, the strongest available method will be used. | |
""" | |
if method is None: | |
method = methods[0] | |
s = '${}$'.format(method.ident) if method.ident else '' | |
s += ''.join(_sr.sample(_saltchars, method.salt_chars)) | |
return s | |
def crypt(word, salt=None): | |
"""Return a string representing the one-way hash of a password, with a salt | |
prepended. | |
If ``salt`` is not specified or is ``None``, the strongest | |
available method will be selected and a salt generated. Otherwise, | |
``salt`` may be one of the ``crypt.METHOD_*`` values, or a string as | |
returned by ``crypt.mksalt()``. | |
""" | |
if salt is None or isinstance(salt, _Method): | |
salt = mksalt(salt) | |
return _crypt.crypt(word, salt) | |
# available salting/crypto methods | |
METHOD_CRYPT = _Method('CRYPT', None, 2, 13) | |
METHOD_MD5 = _Method('MD5', '1', 8, 34) | |
METHOD_SHA256 = _Method('SHA256', '5', 16, 63) | |
METHOD_SHA512 = _Method('SHA512', '6', 16, 106) | |
methods = [] | |
for _method in (METHOD_SHA512, METHOD_SHA256, METHOD_MD5): | |
_result = crypt('', _method) | |
if _result and len(_result) == _method.total_size: | |
methods.append(_method) | |
methods.append(METHOD_CRYPT) | |
del _result, _method | |
print "Enter Passwort and hit Enter:" | |
pwd = sys.stdin.readline() | |
print crypt(pwd, mksalt(METHOD_MD5)) | |
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