code: def import_keys(self, keyspec):
          
          for where, spec in keyspec.items():
              if where == 'file':
                  for typ, files in spec.items():
                      if typ == 'rsa':
                          for fil in files:
                              _key = RSAKey(
                                  key=import_private_rsa_key_from_file(fil),
                                  use='sig')
                              _kb = KeyBundle()
                              _kb.append(_key)
                              self.keyjar.add_kb('', _kb)
              elif where == 'url':
                  for iss, url in spec.items():
                      kb = KeyBundle(source=url)
                      self.keyjar.add_kb(iss, kb)
docs: The client needs it's own set of keys. It can either dynamically
          create them or load them from local storage.
          This method can also fetch other entities keys provided the
          URL points to a JWKS.
  
          :param keyspec: