c# - IdentityServer3 symmetric key issue on Relying Party -

i set selfhost(inmem ws-fed) thinktecture identityserver3 project example , i'm trying use jwt, problem recieve tokens signed asymmetric key using alg rs256 need them symmetric using alg hs256 can use same key on client.

i have tried follow some examples configuring relying party on server no success.

for example, see following markup:

var relyingparty = new relyingparty() {     enabled = true,     realm = "urn:carbon",     name = "test party",     symmetricsigningkey =        convert.frombase64string("r03w9kjersslh11px+r/o7eyfaadsmqfzd5haqzj6eu="),     tokenlifetime = 120 }; 

but when try on code, have error on symmetricsigningkey , says that:

'thinktecture.identityserver.wsfederation.models.relyingparty' not contain definition 'symmetricsigningkey'

what doing wrong?, in advance!

update

markup of startup file:

public void configuration(iappbuilder appbuilder) {     var factory = inmemoryfactory.create(         users: users.get(),         clients: clients.get(),         scopes: scopes.get()     );      var options = new identityserveroptions     {         issueruri = "https://idsrv3.com",         sitename = "thinktecture identityserver3 - wsfed",          signingcertificate = certificate.get(),         factory = factory,         pluginconfiguration = configureplugins,      };      appbuilder.useidentityserver(options); }  private void configureplugins(iappbuilder pluginapp, identityserveroptions options) {     var wsfedoptions = new wsfederationpluginoptions(options);      // data sources in-memory services     wsfedoptions.factory.register(new registration<ienumerable<relyingparty>>(relyingparties.get()));     wsfedoptions.factory.relyingpartyservice = new registration<irelyingpartyservice>(typeof(inmemoryrelyingpartyservice));      pluginapp.usewsfederationplugin(wsfedoptions); } 

markup of scope used:

new scope {     name = "api1" } 

markup of client used:

new client {     clientname = "silicon on behalf of carbon client",     clientid = "carbon",     enabled = true,     accesstokentype = accesstokentype.jwt,      flow = flows.resourceowner,     clientsecrets = new list<clientsecret>     {         new clientsecret("21b5f798-be55-42bc-8aa8-0025b903dc3b".sha256())     } } 

markup of user used:

new inmemoryuser{subject = "bob", username = "bob", password = "bob",      claims = new claim[]     {         new claim(constants.claimtypes.givenname, "bob"),         new claim(constants.claimtypes.familyname, "smith"),         new claim(constants.claimtypes.email, "bobsmith@email.com")     } } 

update

i check class model of relying party of identityserver3 , there's no property symmetric signing key... i'm lost...

any ideas?