OpenWebNet password

Calculates the password requested by ethernet gateways from the Legrand / Bticino MyHome OpenWebNet home automation system when the user's ip address is not in the gateway's whitelist

conversation goes as follows

< *#*1## > *99*0## < *#603356072##

at which point a password should be sent back, calculated from the "openpassword" that is set in the gateway, and the nonce that was just sent

> *#25280520## < *#*1##

Python

<lang python>#!/usr/bin/env python

1. -*- coding: utf-8 -*-

def ownCalcPass (password, nonce) :

   m_1 = 0xFFFFFFFFL
   m_8 = 0xFFFFFFF8L
   m_16 = 0xFFFFFFF0L
   m_128 = 0xFFFFFF80L
   m_16777216 = 0XFF000000L
   flag = True
   num1 = 0L
   num2 = 0L
   password = long(password)

   for c in nonce :
       num1 = num1 & m_1
       num2 = num2 & m_1
       if c == '1':
           length = not flag
           if not length :
               num2 = password
           num1 = num2 & m_128
           num1 = num1 >> 7
           num2 = num2 << 25
           num1 = num1 + num2
           flag = False
       elif c == '2':
           length = not flag
           if not length :
               num2 = password
           num1 = num2 & m_16
           num1 = num1 >> 4
           num2 = num2 << 28
           num1 = num1 + num2
           flag = False
       elif c == '3':
           length = not flag
           if not length :
               num2 = password
           num1 = num2 & m_8
           num1 = num1 >> 3
           num2 = num2 << 29
           num1 = num1 + num2
           flag = False
       elif c == '4':
           length = not flag

           if not length:
               num2 = password
           num1 = num2 << 1
           num2 = num2 >> 31
           num1 = num1 + num2
           flag = False
       elif c == '5':
           length = not flag
           if not length:
               num2 = password
           num1 = num2 << 5
           num2 = num2 >> 27
           num1 = num1 + num2
           flag = False
       elif c == '6':
           length = not flag
           if not length:
               num2 = password
           num1 = num2 << 12
           num2 = num2 >> 20
           num1 = num1 + num2
           flag = False
       elif c == '7':
           length = not flag
           if not length:
               num2 = password
           num1 = num2 & 0xFF00L
           num1 = num1 + (( num2 & 0xFFL ) << 24 )
           num1 = num1 + (( num2 & 0xFF0000L ) >> 16 )
           num2 = ( num2 & m_16777216 ) >> 8
           num1 = num1 + num2
           flag = False
       elif c == '8':
           length = not flag
           if not length:
               num2 = password
           num1 = num2 & 0xFFFFL
           num1 = num1 << 16
           num1 = num1 + ( num2 >> 24 )
           num2 = num2 & 0xFF0000L
           num2 = num2 >> 8
           num1 = num1 + num2
           flag = False
       elif c == '9':
           length = not flag
           if not length:
               num2 = password
           num1 = ~num2
           flag = False
       else :
           num1 = num2
       num2 = num1
   return num1 & m_1

def ownTestCalcPass (passwd, nonce, expected) :

       res = ownCalcPass(passwd, nonce)
       m = passwd+' '+nonce+' '+str(res)+' '+str(expected)
       if res == long(expected) :
               print 'PASS '+m
       else : 
               print 'FAIL '+m

if __name__ == '__main__':

   import sys

   ownTestCalcPass('12345','603356072','25280520')
   ownTestCalcPass('12345','410501656','119537670')