AES GCM Encryption in golang

aes-gcm-encryption.go

key := "Symmetric Key" //
func getGCM() {
	if block, err := aes.NewCipher(key); err != nil {
		return nil, err
	} else if gcm, err := cipher.NewGCM(block); err != nil {	
		return nil, err
	} else {
		return gcm, nil
	}
}

func Encrypt() {
	gcm := getGCM()
	nonce := make([]byte, gcm.NonceSize())
	plainText := []byte(message)
	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
		logrus.Error("Error occurred in io.ReadFull in CryptoService", err.Error())
		return "", nil
	}
	return base64.StdEncoding.EncodeToString(gcm.Seal(nonce, nonce, plainText, nil)), nil
}