code: def issuer_name(self):
          
  
          if self._issuer_name is False:
              self._issuer_name = None
              if self.certificate_issuer_value:
                  for general_name in self.certificate_issuer_value:
                      if general_name.name == 'directory_name':
                          self._issuer_name = general_name.chosen
                          break
          return self._issuer_name
docs: :return:
              None, or an asn1crypto.x509.Name object for the issuer of the cert