code: func EncryptString(str, key string) string {
  	s := []byte(str)
  	k := []byte(key)
  	b64 := base64.StdEncoding
  	return b64.EncodeToString(Encrypt(s, k))
  }
docs: // Encrypt the data with key.
  // data is the string to be encrypted.
  // key is the string of encrypt key.