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Date: Tue, 07 Sep 2010 11:16:33 -0400
From: Brad Tilley <brad@...ystems.com>
To: john-users@...ts.openwall.com
Subject: Re: patch of JtR's netscreen.py script, now version
 2.01

Robert Harris wrote:
> John-Users,
> 
>  
> 
> I made a minor change to the current netscreen python script, netscreen.py
> in the "/run" directory
> 
>  
> 
> The file initially looked ok, but gave errors when ran.   
> 
>  
> 
> The enhanced version had a "tab" in it that caused the problem (since
> indention in Python is very important).
> 
>  
> 
> Please note this and previous versions do not run in Python version 3.x
> 
>  
> 
> I'm thinking about converting this script into a Perl script, so we don't
> have separate versions, one for python 2.x and one for python 3.x]


I believe I have the script working in Python 2.4, 2.6 and 3.x:

$ python2.4 netscreen.py 123 123
123:123$nAU8NurYC15Kcb5IasHCAJOt2QEArn

$ python2.6 netscreen.py 123 123
netscreen.py:14: DeprecationWarning: the md5 module is deprecated; use
hashlib instead
  import md5
123:123$nAU8NurYC15Kcb5IasHCAJOt2QEArn

$ python3 netscreen.py 123 123
123:123$nAU8NurYC15Kcb5IasHCAJOt2QEArn

Here is the script (only tested on Debian Linux):

# netscreen.py
# Generate passwords in netscreen format.

import sys

def net(user, password):

        b64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
        middle = "Administration Tools"
        s = "%s:%s:%s" % (user, middle, password)

        # For versions of Python 2.5 and older (Python will complain on
2.6 or higher)
        if sys.version_info[0] == 2 and sys.version_info[0] < 6:
                import md5
                m = md5.new(s).digest()
        else:
                import hashlib
                m = hashlib.md5(s.encode('latin_1')).digest()

        narray = []
        for i in range(8):
                if sys.version_info[0] == 2:
                        n1 = ord(m[2*i])
                        n2 = ord(m[2*i+1])
                        narray.append( (n1<<8 & 0xff00) | (n2 & 0xff) )

                if sys.version_info[0] == 3:
                        n1 = ord(chr(m[2*i]))
                        n2 = ord(chr(m[2*i+1]))
                        narray.append( (n1<<8 & 0xff00) | (n2 & 0xff) )

        res = ""
        for i in narray:
                p1 = i >> 12 & 0xf
                p2 = i >> 6  & 0x3f
                p3 = i       & 0x3f
                res = res + b64[p1] + b64[p2] + b64[p3]

        for c, n in  zip("nrcstn", [0, 6, 12, 17, 23, 29]):
                 res = res[:n] + c + res[n:]
        return res


if __name__ == '__main__':

        user = sys.argv[1]
        password = sys.argv[2]

        ciphertext = net(user,password)
        print(("%s:%s$%s" % (user,user,ciphertext)))

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