/**
 * 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, appId, sessionKey) {
	// 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(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
