':return:
None, or an asn1crypto.x509.Name object for the issuer of the cert'

@property
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 == u'directory_name'):
                    self._issuer_name = general_name.chosen
                    break
    return self._issuer_name
