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"""Wrapper to the POSIX crypt library call and associated functionality.
Note that the ``methods`` and ``METHOD_*`` attributes are non-standard
extensions to Python 2.7, backported from 3.3"""
import _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 '' % self.name
def mksalt(method=None):
"""Generate a salt for the specified method.
If not specified, the strongest available method will be used.
This is a non-standard extension to Python 2.7, backported from 3.3
"""
if method is None:
method = methods[0]
s = '$%s$' % 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()``.
Note that these are non-standard extensions to Python 2.7's crypt.crypt()
entrypoint, backported from 3.3: the standard Python 2.7 crypt.crypt()
entrypoint requires two strings as the parameters, and does not support
keyword arguments.
"""
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