HarmonyOS base64如何解密？

Question

用以下方式对string进行加密了，现在需要再解密，如何做？

let base = new util.Base64Helper();
base.encodeToStringSync(stringToUint8Array("密码"))

// 字符串转成字节流
export function stringToUint8Array(str: string) {
  return new Uint8Array(buffer.from(str, 'utf-8').buffer);
}

Answer 1

let textEncoder = new util.TextEncoder("utf-8");
let textDecoder = util.TextDecoder.create('utf-8')
let baseHelper = new util.Base64Helper();
let inputStr = '密码';
let unitArr = textEncoder.encodeInto(inputStr)
let result = baseHelper.encodeToStringSync(unitArr);
let waitDecodeArr = baseHelper.decodeSync(result)
let decodeResult = textDecoder.decodeWithStream(waitDecodeArr)