private RsaKey GetActiveKeyUseDelay(IEnumerable <RsaKey> keys, bool useActivationDelay = true)
{
if (keys == null)
{
return(null);
}
var activeKeys = keys.Where(key => _timeKeeper.IsActive(key, useActivationDelay)).ToArray();
return(activeKeys.OrderBy(key => key.Created).FirstOrDefault());
}
