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v0.5.1
https://github.com/python/cpython
Revision ce1bd6ac7ffaf396157a9ceb55b281a3b196323f authored by Mariatta on 23 June 2017, 02:18:05 UTC, committed by GitHub on 23 June 2017, 02:18:05 UTC
When a class and its subclass are present, the latter is skipped. (cherry picked from commit 6580c19bbbe7bc9bc0884699afd69184f523b32e)
1 parent 491afb5
Tip revision: ce1bd6ac7ffaf396157a9ceb55b281a3b196323f authored by Mariatta on 23 June 2017, 02:18:05 UTC
[3.5] bpo-30619: Clarify typing.Union documentation (GH-2326) (GH-2338)
[3.5] bpo-30619: Clarify typing.Union documentation (GH-2326) (GH-2338)
Tip revision: ce1bd6a
crypt.py
"""Wrapper to the POSIX crypt library call and associated functionality."""
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 '<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.choice(_saltchars) for char in range(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
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