/**
 * Created by rd on 2017/5/4.
 */
// 引入CryptoJS  路径依个人导入情况变动
var Crypto = require('./cryptojs-master/cryptojs.js').Crypto;
var app = getApp();

function RdWXBizDataCrypt(appId, sessionKey) {
  this.appId = appId;
  this.sessionKey = sessionKey;
}

RdWXBizDataCrypt.prototype.decryptData = function (encryptedData, iv) {
  // base64 decode ：使用 CryptoJS 中 Crypto.util.base64ToBytes()进行 base64解码
  var encryptedData = Crypto.util.base64ToBytes(encryptedData);
  var key = Crypto.util.base64ToBytes(this.sessionKey);
  var iv = Crypto.util.base64ToBytes(iv);

  // 对称解密使用的算法为 AES-128-CBC，数据采用PKCS#7填充
  var mode = new Crypto.mode.CBC(Crypto.pad.pkcs7);

  try {
    // 解密
    var bytes = Crypto.AES.decrypt(encryptedData, key, {
      asBpytes: true,
      iv: iv,
      mode: mode,
    });
    var decryptResult = JSON.parse(bytes);
  } catch (err) {
    console.log(err);
  }

  return decryptResult;
};

module.exports = RdWXBizDataCrypt;