HarmonyOS AES加密？

Question

麻烦针对下面这段java代码给出HarmonyOS 的代码，试着找了几个但是总报错

java代码如下：

try {
  SecretKeySpec keySpec = new SecretKeySpec(KEY.getBytes("UTF-8"), "AES");
  Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
  cipher.init(Cipher.ENCRYPT_MODE, keySpec);
  byte[] encryptedBytes = cipher.doFinal(input.getBytes("UTF-8"));
  return Base64.encodeToString(encryptedBytes, Base64.DEFAULT);
} catch (Exception e) {
  e.printStackTrace();
}
return "";

Answer 1

示例参考：

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

// 加密消息
function encryptMessage(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
  let cipher = cryptoFramework.createCipher('AES256|ECB|PKCS5');
  cipher.initSync(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null);
  let cipherData = cipher.doFinalSync(plainText);
  return cipherData;
}
// 解密消息
function decryptMessage(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
  let decoder = cryptoFramework.createCipher('AES256|ECB|PKCS5');
  decoder.initSync(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, null);
  let decryptData = decoder.doFinalSync(cipherText);
  return decryptData;
}

async function genSymKeyByData(symKeyData: Uint8Array) {
  let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
  let aesGenerator = cryptoFramework.createSymKeyGenerator('AES256');
  let symKey = await aesGenerator.convertKey(symKeyBlob);
  console.info('convertKey success');
  return symKey;
}

async function main() {
  try {
    let keystr = 'Bp(M+ub%pmnOns79UsevKDd]xy4WcyUO'
    // let base64Helper = new util.Base64Helper();
    let keyData = stringToUint8Array(keystr)
    // let keyData = base64Helper.decodeSync(keystr)
    let symKey = await genSymKeyByData(keyData);
    let message = "This is a test";
    let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
    let encryptText = encryptMessage(symKey, plainText);
    let decryptText = decryptMessage(symKey, encryptText);
    if (plainText.data.toString() === decryptText.data.toString()) {
      console.info('decrypt ok');
      console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
    } else {
      console.error('decrypt failed');
    }
  } catch (error) {
    console.error(`AES ECB “${error}“, error code: ${error.code}`);
  }
}

@Entry
@Component
struct AESDemo {
  @State message: string = 'Hello World';
  aboutToAppear(): void {
    main()
  }

  build() {
    RelativeContainer() {
      Text(this.message)
        .id('AESDemoHelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
    }
    .height('100%')
    .width('100%')
  }
}

function stringToUint8Array(str: string) {
  return new Uint8Array(buffer.from(str, 'utf-8').buffer);
}

encryptText转换成base64，参考示例如下：

let base64Helper = new util.Base64Helper();
let base64Str = base64Helper.encodeToStringSync(encryptText .data);

根据密钥长度，我们这边只能使用AES256这种规格