HarmonyOS 3DES的key长度不符合

3des的key长度超过24的话只能使用三方库crypto-js来实现这个32位密钥长度的加解密能力。

参考下面crypto-js的代码3des cbc demo实例：

import CryptoJS from '@ohos/crypto-js'

@Entry
@Component
struct TDes3Crypto {
  @State message: string = '点击开始';

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .onClick(() => {
            DES3Crypto()
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}

function DES3Crypto() {
  let str: string = "xxx";
  let key: string = "xxx";
  let UTF8key: string = CryptoJS.enc.Hex.parse(key);
  let encrypted: string = CryptoJS.TripleDES.encrypt(str, UTF8key, {
    mode: CryptoJS.mode.CBC,
    padding: CryptoJS.pad.Pkcs5,
    iv: CryptoJS.enc.Hex.parse('xxx')
  }).ciphertext.toString(CryptoJS.enc.Base64);
  console.log("TripleDES encrypt:" + encrypted);
  let decrypted: string = CryptoJS.TripleDES.decrypt(encrypted, UTF8key, {
    mode: CryptoJS.mode.CBC,
    padding: CryptoJS.pad.Pkcs5,
    iv: CryptoJS.enc.Hex.parse('xxx')
  }).toString(CryptoJS.enc.Utf8);
  console.log("TripleDES decrypt:" + decrypted);
}
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