crypt
— 用于校验 Unix 口令的函数
¶
This module implements an interface to the crypt(3) routine, which is a one-way hash function based upon a modified DES algorithm; see the Unix man page for further details. Possible uses include allowing Python scripts to accept typed passwords from the user, or attempting to crack Unix passwords with a dictionary.
Notice that the behavior of this module depends on the actual implementation of the crypt(3) routine in the running system. Therefore, any extensions available on the current implementation will also be available on this module.
crypt.
crypt
(
word
,
salt
)
¶
word
will usually be a user’s password as typed at a prompt or in a graphical interface.
salt
is usually a random two-character string which will be used to perturb the DES algorithm in one of 4096 ways. The characters in
salt
must be in the set
[./a-zA-Z0-9]
. Returns the hashed password as a string, which will be composed of characters from the same alphabet as the salt (the first two characters represent the salt itself).
Since a few crypt(3) extensions allow different values, with different sizes in the salt , it is recommended to use the full crypted password as salt when checking for a password.
阐明典型用法的简单范例：
import crypt, getpass, pwd def login(): username = raw_input('Python login:') cryptedpasswd = pwd.getpwnam(username)[1] if cryptedpasswd: if cryptedpasswd == 'x' or cryptedpasswd == '*': raise NotImplementedError( "Sorry, currently no support for shadow passwords") cleartext = getpass.getpass() return crypt.crypt(cleartext, cryptedpasswd) == cryptedpasswd else: return 1