HarmonyOS 鸿蒙Next是否有支持AES256的数据加解密的库或者第三方支持

可以试一下：[https://ohpm.openharmony.cn/#/cn/detail/@hw-agconnect%2Fpetal-aegis](https://ohpm.openharmony.cn/#/cn/detail/@hw-agconnect%2Fpetal-aegis)

AES加密可以试一下下面的demo

import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { util } from '@kit.ArkTS';
@Entry
@Component
struct AESCBCCrypto {
  @State message: string = '点击开始';
  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .onClick(() => {
            testSyncGenerateAesKey()
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}
async function testSyncGenerateAesKey() {
  // 创建SymKeyGenerator实例
  let symKeyGenerator = cryptoFramework.createSymKeyGenerator('AES256');
  // 使用密钥生成器随机生成对称密钥
  let promiseSymKey = symKeyGenerator.generateSymKeySync();
  // 获取对称密钥的二进制数据，输出256位密钥。长度为32字节
  let encodedKey = promiseSymKey.getEncoded();
  console.info('key hex:' + encodedKey.data);
  // console.info('key hex:' + encodedKey);
  let base64 = new util.Base64Helper();
  let keyString = await base64.encodeToString(encodedKey.data);
  let keyString1 = base64.encodeToStringSync(encodedKey.data);
  // console.info('key stringify:' + JSON.stringify(keyString));
  console.info('key string:' + keyString);
  console.info('key string1:' + keyString1);
}

使用鸿蒙的 @ohos.security.cryptoFramework 进行 AES256 加解密的话，对应的key应当是32字节。提供的 key 字节数不正确，建议使用三方库 crypto-js 进行加解密：https://gitee.com/openharmony-sig/crypto-js

//加密
const content: string = '{"from":"com.csair.opwsMobile", "parameter":{"username":"vote","roleId":"88954","roleName":"vote","businessType":"vote","toUsername":"vote","groupId":"1608259460000889551","pluginId":"vote","pluginName":"vote","createTime":"vote","extra":{"extra1":"123"}}}';
const AES_ENCRYPT_KEY: string = '1a2a23a';
this.result = CryptoJS.AES.encrypt(content, AES_ENCRYPT_KEY).toString();
console.log("AES encrypt = " + this.result);
//解密
let decrypted: string = CryptoJS.AES.decrypt(this.result, AES_ENCRYPT_KEY).toString(CryptoJS.enc.Utf8);
console.log("AES decrypt = " + decrypted);