How to use the onelogin.saml2.utils.OneLogin_Saml2_Utils.format_cert function in onelogin

def format_idp_cert_multi(self):
        """
        Formats the Multple IdP certs.
        """
        if 'x509certMulti' in self.__idp:
            if 'signing' in self.__idp['x509certMulti']:
                for idx in range(len(self.__idp['x509certMulti']['signing'])):
                    self.__idp['x509certMulti']['signing'][idx] = OneLogin_Saml2_Utils.format_cert(self.__idp['x509certMulti']['signing'][idx])

            if 'encryption' in self.__idp['x509certMulti']:
                for idx in range(len(self.__idp['x509certMulti']['encryption'])):
                    self.__idp['x509certMulti']['encryption'][idx] = OneLogin_Saml2_Utils.format_cert(self.__idp['x509certMulti']['encryption'][idx])

def format_sp_cert(self):
        """
        Formats the SP cert.
        """
        self.__sp['x509cert'] = OneLogin_Saml2_Utils.format_cert(self.__sp['x509cert'])

def format_sp_cert_new(self):
        """
        Formats the SP cert.
        """
        self.__sp['x509certNew'] = OneLogin_Saml2_Utils.format_cert(self.__sp['x509certNew'])

def format_idp_cert(self):
        """
        Formats the IdP cert.
        """
        self.__idp['x509cert'] = OneLogin_Saml2_Utils.format_cert(self.__idp['x509cert'])

def __add_x509_key_descriptors(root, cert, signing):
        key_descriptor = OneLogin_Saml2_XML.make_child(root, '{%s}KeyDescriptor' % OneLogin_Saml2_Constants.NS_MD)
        root.remove(key_descriptor)
        root.insert(0, key_descriptor)
        key_info = OneLogin_Saml2_XML.make_child(key_descriptor, '{%s}KeyInfo' % OneLogin_Saml2_Constants.NS_DS)
        key_data = OneLogin_Saml2_XML.make_child(key_info, '{%s}X509Data' % OneLogin_Saml2_Constants.NS_DS)

        x509_certificate = OneLogin_Saml2_XML.make_child(key_data, '{%s}X509Certificate' % OneLogin_Saml2_Constants.NS_DS)
        x509_certificate.text = OneLogin_Saml2_Utils.format_cert(cert, False)
        key_descriptor.set('use', ('encryption', 'signing')[signing])

provider = list(providers[0].keys())[0]
        req['get_data']['provider'] = provider

    for index, provider_obj in enumerate(providers):
        if list(provider_obj.keys())[0] == provider:
            base_cfg = settings.SAML_PROVIDERS[index][provider]
            break

    if not base_cfg:
        raise SAMLSettingsError("Provider %s was not found in settings" % provider)

    final_cfg = base_cfg
    try:
        final_cfg['sp']['x509cert'] = OneLogin_Saml2_Utils.format_cert(final_cfg['sp']['x509cert'])
        final_cfg['sp']['privateKey'] = OneLogin_Saml2_Utils.format_private_key(final_cfg['sp']['privateKey'])
        final_cfg['idp']['x509cert'] = OneLogin_Saml2_Utils.format_cert(final_cfg['idp']['x509cert'])
    except KeyError:
        pass

    return final_cfg

def format_sp_cert(self):
        """
        Formats the SP cert.
        """
        self.__sp['x509cert'] = OneLogin_Saml2_Utils.format_cert(self.__sp['x509cert'])