Using the crypt module in Windows?

Question

In IDLE and Python version 3.3.2, I try and call the python module like so:

hash2 = crypt(word, salt)

I import it at the top of my program like so:

from crypt import *

The result I get is the following:

Traceback (most recent call last):
  File "C:\none\of\your\business\adams.py", line 10, in <module>
    from crypt import *
  File "C:\Python33\lib\crypt.py", line 3, in <module>
    import _crypt
ImportError: No module named '_crypt'

However, when I execute the same file adams.py in Ubuntu, with Python 2.7.3, it executes perfectly - no errors.

I tried the following to resolve the issue for my Windows & Python 3.3.2 (though I'm sure the OS isn't the issue, the Python version or my use of syntax is the issue):

1. Rename the directory in the Python33 directory from Lib to lib
2. Rename the crypt.py in lib to _crypt.py. However, it turns out the entire crypt.py module depends on an external module called _crypt.py too.
3. Browsed internet to download anything remotely appropriate to resemble _crypt.py

It's not Python, right? It's me...(?) I'm using syntaxes to import and use external modules that are acceptable in 2.7.3, but not in 3.3.2. Or have I found a bug in 3.3.2?

Answer 1

I assume that is because crypt is a Unix Specific Service.

Right at the top of the docs for crypt:

34.5. crypt — Function to check Unix passwords

Platforms: Unix

Answer 2

A better approach would be to use the python passlib module which generates compatible crypt hashes of linux passwords (I assume that's what you most probably want). I've verified this by using Kickstart files by injecting the generated hashed password value in rootpw and user attributes. The functions you need are:

from passlib.hash import md5_crypt as md5
from passlib.hash import sha256_crypt as sha256
from passlib.hash import sha512_crypt as sha512

md5_passwd = md5.encrypt(passwd, rounds=5000, implicit_rounds=True)
sha256_passwd = sha256.encrypt(passwd, rounds=5000, implicit_rounds=True)
sha512_passwd = sha512.encrypt(passwd, rounds=5000, implicit_rounds=True)

The first parameter is self-explanatory.
The second & third parameter have to do with specification compliance and are required to generate linux compatible password hashes^*** (see: Passlib: SHA256 spec, format & algorithm)

^***NOTE: Tested with SHA512 but I see no reason why it shouldn't work with SHA256 or MD5.

Answer 3

I found an alternative module called fcrypt available here:

• https://pypi.python.org/pypi/fcrypt/1.3.1
• http://carey.geek.nz/code/python-fcrypt/

It's old, so don't expect python3 compatibility.

Answer 4

You can use instead 'bcrypt' for this purpose on a Windows PC, this is done because crypt is a UNIX module only so wont be compatible in windows easily. Go for bcrypt

import bcrypt
password = b"passit" #passit is the word to encrypt
pass = bcrypt.hashpw(password, bcrypt.gensalt())
print(b)

This will get your work done. For further reference, visit: http://passlib.readthedocs.io/en/stable/install.html

https://pypi.python.org/pypi/bcrypt/2.0.0