HarmonyOS aes加密解密字符超出报错？

Question

加密的文字超出16个字就报错：

// let message = `this is a ttttttttttttt`
let message = `this is a tttt` 

长的报错短的不会。

Answer 1

不存在超过16个字节加密失败的问题，参考以下加解示例：

输出如下：

encryptText: text64  vDzat+EcLsrElIhplzR8MZ8QQdY2+SRo80lMW86Udl+fEEHWNvkkaPNJTFvOlHZfnxBB1jb5JGjzSUxbzpR2X8OcwsA85AvJQMGa2xH6hm4=
  encryptText: text16  BC3CDAB7E11C2ECAC494886997347C319F10xxx94C5BCE94765FC39CC2C03CE40BC940C19ADB11FA866E
this is a ttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt

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

@Entry()
@Component
struct AESEEBCrypto {
  @State message: string = '点击开始';

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

const name: string = ""

// 加密消息
function encryptMessage(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
  let cipher = cryptoFramework.createCipher('AES128|ECB|PKCS7');
  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('AES128|ECB|PKCS7');
  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('AES128');
  let symKey = await aesGenerator.convertKey(symKeyBlob);
  console.info('convertKey success');
  return symKey;
}

function uint8ArrayTo16(arr: Uint8Array) {
  // let arr = new Uint8Array([34, 22, 11, 34]);
  let str = buffer.from(arr).toString('hex')
  console.log(str) // 22160b22
  let str2 = str.toUpperCase()
  console.log(str2) // 22160B22
  return str2;
}

async function aesECB() {
  try {
    let base64 = new util.Base64Helper();

    let keyData = "ffaa622a942ba86b";
    let key16 = new Uint8Array(buffer.from(keyData, 'utf-8').buffer)
    let symKey = await genSymKeyByData(key16);

    let message = `this is a ttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt`
    let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
    let encryptText = encryptMessage(symKey, plainText);
    console.error('encryptText: ' + encryptText.data.toString());
    let text64 = base64.encodeToStringSync(encryptText.data)
    console.error('encryptText: text64  ' + text64);
    let text16 = uint8ArrayTo16(encryptText.data)
    console.error('encryptText: text16  ' + text16);

    let decryptText = decryptMessage(symKey, encryptText);
    console.info('decryptText: ' + decryptText.data.toString());
    console.info('decryptText: ' + buffer.from(decryptText.data).toString('utf-8'));
  } catch (error) {
    console.error(`AES ECB “${error}“, error code: ${error.code}`);
  }
}