code: func (r *Store) Crypto(ctx context.Context, name string) backend.Crypto {
  	_, sub, _ := r.getStore(ctx, name)
  	if !sub.Valid() {
  		out.Debug(ctx, "Sub-Store not found for %s. Returning nil crypto backend", name)
  		return nil
  	}
  	return sub.Crypto()
  }
docs: // Crypto returns the crypto backend