public void ConfigureServices(IServiceCollection services)
{
  services.AddDataProtection();
}

public class HomeController : Controller
{
  private readonly ISecureDataFormat<string> _dataFormat;

  public HomeController(IDataProtectionProvider _dataProtectionProvider)
  {
    var dataProtector = _dataProtectionProvider.CreateProtector(typeof(HomeController).FullName);
    _dataFormat = new SecureDataFormat<string>(new StringSerializer(), dataProtector);
  }

  public string GenerateToken()
  {
    return _dataFormat.Protect(Guid.NewGuid().ToString() + ";" + DateTime.Now.AddHours(10));
  }

  public string DecryptToken(string token)
  {
    return _dataFormat.Unprotect(token);
  }

  private class StringSerializer : IDataSerializer<string>
  {
    public string Deserialize(byte[] data)
    {
      return Encoding.UTF8.GetString(data);
    }

    public byte[] Serialize(string model)
    {
      return Encoding.UTF8.GetBytes(model);
    }
  }
}