convert toxkey to toxDns secured with pin and back.

tox2dns2tox.py

import binascii
    def generateKey(dns,pin):
      pub = dns[11:75]
      logger.info(pub)
      check = dns[83:87]
      logger.info(check)
      nospam = binascii.a2b_base64(pin+"==")
      nospam =str(binascii.hexlify(nospam))
      nospam = nospam[2:-1]
      nospam = nospam.upper()
      print("lookupkey="+pub+nospam+check)
      return pub+nospam+check

    def generateDnsId(key):
      if len(key)==76:
        logger.info("init-lookupkey: "+key)
        pub = key[0:64]
        nospam = key[64:72]
        checksum = key[71:76]
        dns="v=tox2;pub="+pub+";check="+checksum
        logger.info(dns)
        binData = binascii.unhexlify(nospam)
        b64data= binascii.b2a_base64(binData)
        b64data=str(b64data)
        b64data=b64data[2:-5]
        pin=b64data.rstrip('=')
        logger.info(dns)
        self.ui.toxTryNotifications.append("Your pin is "+pin)
        return (dns,pin)
      else:
        logger.error("Wrong key size")