code: def _compute_permanent_id(private_key):
      
      pub = private_key.public_key()
      p = pub.public_bytes(
          encoding=serialization.Encoding.PEM,
          format=serialization.PublicFormat.PKCS1
      )
      z = ''.join(p.decode('ascii').strip().split('\n')[1:-1])
      b = base64.b64decode(z)
      h1 = hashlib.new('sha1')
      h1.update(b)
      permanent_id = h1.digest()[:10]
      return base64.b32encode(permanent_id).lower().decode('ascii')
docs: Internal helper. Return an authenticated service's permanent ID
      given an RSA private key object.
  
      The permanent ID is the base32 encoding of the SHA1 hash of the
      first 10 bytes (80 bits) of the public key.