HarmonyOS 字符串解密？

Question

后台先对vlue进行UTF-8转成2进制数组key进行MD5加密，然后进行Tripledes加密然后base64进行编码。前端先进行base64解码Tripledes解密结果是乱码。

uint8ArrayToHexStr(data: Uint8Array): string {
  let hexString = '';
  let i: number;
  for (i = 0; i < data.length; i++) {
    let char = ('00' + data[i].toString(16)).slice(-2);
    hexString += char;
  }
  console.info('Uint8Array转十六进制:' + hexString);
  return hexString;
}

encodeHtml(data:ePaperDetail){
  if(data.encrypt=='1') {
    //默认不传编码格式为hex
    let md5str =  CryptoJS.MD5(useInfo.epaperSubjectResult.decryptKey);
    Base64Util.decode(data.html).then((htmlString:Uint8Array)=>{
      let html=CryptoJS.enc.Utf8.stringify(CryptoJS.TripleDES.decrypt(this.uint8ArrayToHexStr(htmlString),CryptoJS.enc.Hex.stringify(md5str)))
    })
  }
}

Answer 1

加密解密必须使用同一个方式，可以使用3des加解密。参考示例如下：

import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } 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(() => {
            DES3Crypto()
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}

// 加密消息
function encryptMessage(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
  let cipher = cryptoFramework.createCipher('3DES192|ECB|PKCS7');
  cipher.initSync(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null);
  let encryptData = cipher.doFinalSync(plainText);
  return encryptData;
}

// 解密消息
function decryptMessage(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
  let decoder = cryptoFramework.createCipher('3DES192|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 symGenerator = cryptoFramework.createSymKeyGenerator('3DES192');
  let symKey = await symGenerator.convertKey(symKeyBlob);
  console.info('convertKey success');
  return symKey;
}

async function DES3Crypto() {
  let keyData =
    new Uint8Array([238, 249, 61, 55, 128, 220, 183, 224, 139, 253, 248, 239, 239, 41, 71, 25, 235, 206, 230, 162, 249,
      27, 234, 114]);
  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');
  }
}