private static void RegisterTokenAuthorizationOptions(IServiceCollection services)
{
RSACryptoServiceProvider keyService = new RSACryptoServiceProvider(2048);
keyService.FromXmlString(Resources.RsaProvider);
RsaSecurityKey key = new RsaSecurityKey(keyService.ExportParameters(true));
var tokenOptions = new TokenAuthorizationOptions
{
Audience = "MobileSecondHandApp",
Issuer = "MarcinSzyszka",
SigningCredentials = new SigningCredentials(key, SecurityAlgorithms.RsaSha256Signature)
};
services.AddSingleton <TokenAuthorizationOptions>(tokenOptions);
}