code: func GetCryptoBackend(ctx context.Context) CryptoBackend {
  	be, ok := ctx.Value(ctxKeyCryptoBackend).(CryptoBackend)
  	if !ok {
  		return GPGCLI
  	}
  	return be
  }
docs: // GetCryptoBackend returns the selected crypto backend or the default (GPGCLI)