HarmonyOS 鸿蒙Next中国密加解密

以下是SM4加解密开发指南以及demo，SM2加解密、验签开发指南以及demo链接：

• SM2加密使用指南：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/crypto-sm2-asym-encrypt-decrypt-V5
• SM2密钥对签名验签：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/crypto-sm2-sign-sig-verify-pkcs1-V5
• SM4加密使用指南：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/crypto-sm4-sym-encrypt-decrypt-ecb-V5
• 加解密算法库框架API文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-cryptoframework-V5

关于ArkTS使用加解密时进行数据处理，可以参考以下demo：

import { systemDateTime } from '@kit.BasicServicesKit';
import { HashMap } from '@ohos.util.HashMap';
import { ArrayList, TreeMap, util } from '@kit.ArkTS';

private chnlId: string = "B2D051287CCC440AA35AC8A3A1A25DF7";
private sm4Key: string = "B43FEB3A704F41DAAB06C2129AFBEAB6";
private prvkey: string = "AIMA5mO+UsEIZwa+8SWiOr9YEPot2+pJzXM0NIDE5G0F";
private pubkey: string = "BH4K0o+TX/WyspBF7kI5vmHx7Q9RyUY58DjPgXxHnWzG9W9ECgpAQvmTKD+zKect9di4zfzSDc37saAJFL/EWxI=";
private version: string = "1.0.0";
private encType: string = "SM4";
private signType: string = "plain";
private ignoreSign: string[] = ['signData', 'encData', 'extra'];

// map用例 HashMap<string, string|number>，这里value数据类型使用 string|number ，可根据需求指定数据类型，ArtTS不支持泛型（比如TS中的any、unknown等）

function encryptMsg2(body: string): HashMap<string, string|number> {
  let map = new HashMap<string, string|number>();
  map.set("data", body);
  map.set("appId", this.chnlId);
  map.set("encType", this.encType);
  map.set("signType", this.signType);
  map.set("timestamp", systemDateTime.getTime());
  map.set("version", this.version);

  // 签名
  let signData: string = this.signature(map, this.sm4Key, this.prvkey);

  map.remove("data");
  map.set("signData", signData);
  map.set("encData", body);

  return map;
}

function signature(map: HashMap<string, string|number>, sm4Key: string, prvkey: string): string {
  let base64Helper = new util.Base64Helper();
  let byteArr: Array<number> = [];
  try {
    byteArr = this.getSignText(map, sm4Key);
  } catch (err) {
    byteArr = this.stringToArray(JSON.stringify(this.mapIterator(map)));
  }
  let chnlSecretByte = this.stringToArray(sm4Key);
  let prvkeyTemp: Uint8Array = base64Helper.decodeSync(prvkey);

  // return base64Helper.encodeToStringSync( this.signSm3WithSm2(byteArr,chnlSecretByte,prvkeyTemp) )
  return "";
}

function signSm3WithSm2(byteArr: Array<number>, chnlSecretByte: Array<number>, prvkeyTemp: Uint8Array) {
  // 无具体代码实现
  return new Uint8Array();
}

// Record没有hashmap这么灵活的操作方法，hashmap没有 Record 对象转换JSON串的优势，对应JAVA中如果需要将数据转换字符串处理使用Record

// 遍历map集合，去空值，并且生成一个Record对象（对应JAVA中JSONObject,可转换成类似于JSON串或者JSON对象的操作）
function mapIterator(map: HashMap<string, string|number>) {
  let record: Record<string, string|number> = {};
  try {
    let iter = map.keys();
    let temp: IteratorResult<string> = iter.next();
    while (!temp.done) {
      let key = temp.value;
      let value = map.get(key);
      if (value) { // 简单判空
        record[key] = value;
      }
      temp = iter.next();
    }
  } catch (err) {
    console.log(err);
  }
  return record;
}

// 将string字符串转换成byte数组
function stringToArray(str: string) {
  let arr: Array<number> = [];
  for (let i = 0, j = str.length; i < j; ++i) {
    arr.push(str.charCodeAt(i));
  }
  return arr;
}

function getSignText(map: HashMap<string, string|number>, appSecret: string): Array<number> {
  let treeMap: TreeMap<string, string|number> = new TreeMap<string, string|number>();
  // 1
  let iter = map.keys();
  let temp: IteratorResult<string> = iter.next();
  while (!temp.done) {
    let key = temp.value;
    let value = map.get(key);
    if (value && !this.ignoreSign.includes(key)) {
      treeMap.set(key, value);
    }
    temp = iter.next();
  }
  // 2 treeMap自动将key做了升序排序，存入List时就是升序的内容
  let strList: ArrayList<string|number> = new ArrayList<string|number>();
  let iterTreeMap = treeMap.keys();
  let tempTreeMap: IteratorResult<string> = iterTreeMap.next();
  while (!tempTreeMap.done) {
    let key = tempTreeMap.value;
    let value = treeMap.get(key);
    if (value) {
      strList.add(key + "=" + value + "&");
    }
    tempTreeMap = iterTreeMap.next();
  }
  let strTemp = "";
  for (let i = 0; i < strList.length; ++i) {
    strTemp += strList[i];
  }
  strTemp += "key=" + appSecret;
  return this.stringToArray(strTemp);
}