netscreen.py

#!/usr/bin/env python
import hashlib

## Origional Block
def makepass(user, password):
    b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
    middle = "Administration Tools"
    s = "%s:%s:%s" % (user, middle, password)

    m = hashlib.md5(s).digest()

    #create pairs of characters from hash string
    narray = []
    for i in range(8):
        n1 = ord(m[2*i])
        n2 = ord(m[2*i+1])
        #uses n1 as high byte and n2 as low byte of 16 bit number
        narray.append( (n1<<8 & 0xff00) | (n2 & 0xff) )
    print narray

    #takes 8x 16bit numbers from above to create triples of chars
    res = ""
    for i in narray:
        p1 = i >> 12 & 0xf  #set to high4 bits of i
        p2 = i >> 6  & 0x3f #set to bits value 6-12
        p3 = i       & 0x3f #set to low 6 bits of i
        print i, p1 , p2 , p3
        print b64[p1],b64[p2], b64[p3]
        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