HarmonyOS HmacSHA1 加密算法 参数问题

参考下demo:

import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } from '@kit.ArkTS';

@Entry
@Component
struct HmacSHaPage {
  @State message: string = 'Hello World';

  build() {
    Column(){
      Button('click').onClick(() => {
        getHmac('hello HarmonyOs')
      })

    }.height('100%').width('100%')
  }
}
// 可理解的字符串转成字节流
function stringToUint8Array(str: string) {
  let arr = new Uint8Array(str.length);
  for (let i = 0, j = str.length; i < j; ++i) {
    arr[i] = str.charCodeAt(i);
  }
  return arr;
}

async function getHmac(message: string) {
  try {
    let macAlgName = 'SHA1';
    let mac = cryptoFramework.createMac(macAlgName)
    let arr = stringToUint8Array('hello HarmonyOs')
    let KeyBlob: cryptoFramework.DataBlob = { data: arr };
    let symKeyGenerator = cryptoFramework.createSymKeyGenerator('HMAC');
    const symKey = await symKeyGenerator.convertKey(KeyBlob);
    await mac.init(symKey)
    await mac.update({ data: stringToUint8Array(message) });
    let macOutpt = await mac.doFinal();
    const res = buffer.from(macOutpt.data).toString('hex');
    console.log('Hmac—:' + res);
  } catch (err) {
    console.log('err:' + err)
  }
}