import cgi
import crypt
import random

salts="abcdefghijklmnopqrstuvwxyz"
memoout={}
memoin={}

cgibase=cgi.FieldStorage()

def transmogrify (param, ix=None):
    if ix == None:
        ix=random.randint(0, len(salts)-3)

    return crypt.crypt(param, salts[ix:ix+2])

def memogrify (param):
    if memoout.has_key(param):
        return memoout[param]

    tmp=transmogrify(param)

    memoout[param]=tmp

    return tmp

def cgivalue (param):
    if memoin.has_key(param):
        return cgibase[memoin[param]]

    for i in range(len(salts)-2):
        token=transmogrify(param, i)

        if cgibase.has_key(token):
            memoin[param]=token

            return cgibase[memoin[param]]

    return None