JMeter学习笔记3：JSR223 PreProcessor前置处理器对密码进行RSA加密

在网站中密码往往不是明文发送的，其中RSA加密方式，前台Javascript脚本对密码进行加密，然后发送加密后密码进行服务器验证。

1、首先明白网站加密逻辑

网站部分代码如下：

    //与后台交互获取公钥
    function getPublicKey() {
        var pubKey = '';
        //if ($.cookie('publicKey') == null) {
        $.ajax({
            url: "/Home/GetRsaPublicKey",
            type: "get",
            contentType: "application/x-www-form-urlencoded; charset=utf-8",
            async: false,
            cache: false,
            data: {},
            dataType: "json",
            success: function (data) {
                if (data.Code == 0) {
                    pubKey = data.RsaPublicKey + "," + data.Key;
                    //$.cookie('publicKey', pubKey, { expires: 1 / 1440 });
                } else {
                    Config.Method.JudgeCode(data, 1);
                }
            }
        });
        //} else {
        //    pubKey = $.cookie('publicKey');
        //}
        return pubKey;
    }

    //公钥加密用户密码Pwd为RSA加密后参数
    function rsaEncrypt(pwd) {
        var publicKey = getPublicKey();
        setMaxDigits(129);
        var rsaKey = new RSAKeyPair(publicKey.split(",")[0], "", publicKey.split(",")[1]);
        var pwdRtn = encryptedString(rsaKey, pwd);
        return pwdRtn + "," + publicKey.split(",")[2];
    }



    var flag = true;
    oLoginIn.onclick = function () {
        if (flag == false) return;
        flag = false;
        var strUsername = $("#username").val();
        var strPassword = $("#password").val();
        //var remflag = document.getElementById("RememberMe").checked;
        //Save(strUsername, remflag);
        //var postData = {
        //    username: strUsername,
        //    password: strPassword,//strPassword,
        //    key: strPassword
        //}
        var strUsername = $("#username").val();
            var strPassword = $("#password").val();
            var enPwd = rsaEncrypt(strPassword);
            var remflag = document.getElementById("RememberMe").checked;
            Save(strUsername, remflag);
            var postData = {
                username: strUsername,
                password: enPwd.split(",")[0],//strPassword,
                key: enPwd.split(",")[1]
            }
        $.ajax({
            url: "/Home/UserLogin",
            type: "POST",
            async: false,
            //dataType:'text',
            data: JSON.stringify(postData),//要传递的参数
            contentType: "application/json",
            ...........略........
   

通过查看Js代码了解到：

a、getPublicKey()作用：通过get请求/Home/GetRsaPublicKey，获取RsaPublicKey和Key

b、rsaEncrypt(pwd)作用：对pwd和a步骤获取的key进行加密

c、进行参数传递：

     var postData = {
                username: strUsername,
                password: enPwd.split(",")[0],//strPassword,
                key: enPwd.split(",")[1]
            }

2、编写JSR223 PreProcessor

 请注意load js脚本，否则提示变量或者方法未定义

vars.put("key"，value)：将value存到jmeter变量key中，在后续请求中使用${“key”}进行引用。

load("BigInt.js");
load("Barrett.js");
load("RSA.js");

function rsaEncrypt(pwd) {
//     访问/Home/GetRsaPublicKey，并通过正则表达提取RsaPublicKey和Key，在JS中直接使用
        var publicKey = "${RsaPublicKey}"+","+"${GetKey}";

        log.info(publicKey);
        setMaxDigits(129);
        var rsaKey = new RSAKeyPair(publicKey.split(",")[0], "", publicKey.split(",")[1]);
        var pwdRtn = encryptedString(rsaKey, pwd);

        return pwdRtn + "," + publicKey.split(",")[2];

    }
    
var enPwd = rsaEncrypt("hisense");
var password = enPwd.split(",")[0];
log.info(password);
vars.put("Password",password);
var key = enPwd.split(",")[1];
log.info(key);
vars.put("Key",key);

3、Jmeter整个计划如图