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  • JS代码混淆初步

    一直以来,JS前端代码因为必须经过IE明文解析,某些加密的JS如:JScript.Encode也因为树大招风,早就被人破解了。还有些加密的手段,通过复杂的变换,改变源码,但最终都逃不脱最后的审判,像unescape,document.write,eval语句来还原。对于JS代码的保护,最好的手段就是混淆,混淆的目的就是让读懂代码的成本比直接写代码的成本高,混淆不是不可破解的,只是增加破解成本,JAVA,C#的加密都是采用混淆。这样对于非常核心的代码,混淆起不到保护代码的作用,不过JS有这样的代码么?本程序没有用到编译原理,其分词解析思想是基于mechiland(http://www.jzchen.net)的代码高亮程序,参考了蓝色经典的加密混淆专题讨论
    <HTML><HEAD><TITLE>Cunfusion</TITLE>
    <META content="MSHTML 6.00.2800.1528" name=GENERATOR>
    <META content="" name=Author>
    <META content="" name=Keywords>
    <META content="" name=Description></HEAD>
    <BODY>
    <SCRIPT language=JavaScript>
    <!--
    /**//*
    **    ==================================================================================================  
    **    类名:CLASS_CONFUSION
    **    功能:JS混淆  
    **    示例:  
        ---------------------------------------------------------------------------------------------------  
      
                var xx        = new CLASS_CONFUSION(code);            

                document.getElementById("display").innerHTML = xx.confusion(); 
      
        ---------------------------------------------------------------------------------------------------  
    **    作者:ttyp  
    **    邮件:ttyp@21cn.com  
    **    日期:2006-3-20  
    **    版本:0.12
    **    ==================================================================================================  
    *
    */
      

    function CLASS_CONFUSION(code){
        
    //哈希表类
        function Hashtable(){
            
    this._hash        = new Object();
            
    this.add        = function(key,value){
                                
    if(typeof(key)!="undefined"){
                                    
    if(this.contains(key)==false){
                                        
    this._hash[key]=typeof(value)=="undefined"?null:value;
                                        
    return true;
                                    }
     else {
                                        
    return false;
                                    }

                                }
     else {
                                    
    return false;
                                }

                            }

            
    this.remove        = function(key){delete this._hash[key];}
            
    this.count        = function(){var i=0;for(var k in this._hash){i++;} return i;}
            
    this.items        = function(key){return this._hash[key];}
            
    this.contains    = function(key){return typeof(this._hash[key])!="undefined";}
            
    this.clear        = function(){for(var k in this._hash){delete this._hash[k];}}

        }


        
    function VariableMap(parent){
            
    this.table = new Hashtable();
            
    this.level = parent?parent.level+1:0;
            
    this.parent= parent;
            
    this.add = function(key,value){this.table.add(key,value)};
            
    this.items = function(key){return this.table.items(key)};
            
    this.count = function(){return this.table.count()};
            
    this.contains = function(key){return this.table.contains(key);}
            
    this.isParameter    = false;
        }


        
    this._caseSensitive = true;

        
    //字符串转换为哈希表
        this.str2hashtable = function(key,cs){
            
            
    var _key    = key.split(/,/g);
            
    var _hash    = new Hashtable(); 
            
    var _cs        = true;

        
            
    if(typeof(cs)=="undefined"||cs==null){
                _cs 
    = this._caseSensitive;
            }
     else {
                _cs 
    = cs;
            }


            
    for(var i in _key){
                
    if(_cs){
                    _hash.add(_key[i]);
                }
     else {
                    _hash.add((_key[i]
    +"").toLowerCase());
                }


            }

            
    return _hash;
        }


        
    //获得需要转换的代码
        this._codetxt        = code;

        
    if(typeof(syntax)=="undefined"){
            syntax 
    = "";
        }


        
    this._deleteComment = false;
        
    //是否大小写敏感
        this._caseSensitive    = true;
        
    //得到关键字哈希表
        this._keywords        = this.str2hashtable("switch,case,delete,default,typeof,for,in,function,void,this,boolean,while,if,return,new,true,false,try,catch,throw,null,else,do,var");
        
    this._function        = this.str2hashtable("function");
        
    this._var            = "var";
        
    this._beginBlock    = "{";
        
    this._endBlock        = "}";
        
        
    this._window        = this.str2hashtable("alert,escape,unescape,document,parseInt,parseFloat");
        
    //得到内建对象哈希表
        this._commonObjects = this.str2hashtable("String,Number,Boolean,RegExp,Error,Math,Date,Object,Array,Global");
        
    //得到分割字符
        this._wordDelimiters= "  ,.?!;:\\/<>(){}[]\"'\r\n\t=+-|*%@#$^&";
        //引用字符
        this._quotation        = this.str2hashtable(
    "\",'");
        
    //行注释字符
        this._lineComment    = "//";
        
    //转义字符
        this._escape        = "\\";
        
    //多行引用开始
        this._commentOn        = "/*";
        
    //多行引用结束
        this._commentOff    = "*/";
        
    this._execute        = "eval";
        
    //引用调用字符
        this._call            = ".";
        
    this._varPause        = "=";
        
    this._varContinue    = ",";
        
    //变量个数
        this._varNum = 0;

        
    this.confusion    = function() {
            
    var codeArr = new Array();
            
    var word_index = 0;
            
    var htmlTxt = new Array();


            
    //得到分割字符数组(分词)
            for (var i = 0; i < this._codetxt.length; i++{
                
                
    if (this._wordDelimiters.indexOf(this._codetxt.charAt(i)) == -1{        //找不到关键字
                    if (codeArr[word_index] == null || typeof(codeArr[word_index]) == 'undefined') {
                        codeArr[word_index] 
    = "";
                    }

                    codeArr[word_index] 
    += this._codetxt.charAt(i);
                }
     else {
                    
    if (typeof(codeArr[word_index]) != 'undefined' && codeArr[word_index].length > 0)
                        word_index
    ++;
                    codeArr[word_index
    ++= this._codetxt.charAt(i);                
                }
     
            }



            
    var quote_opened                = false;    //引用标记
            var slash_star_comment_opened    = false;    //多行注释标记
            var slash_slash_comment_opened    = false;    //单行注释标记
            var line_num                    = 1;        //行号
            var quote_char                    = "";        //引用标记类型
            var call_opened                    = false;
            
    var call_string                    = "";
            
    var var_opened                    = false;
            
    var var_pause                    = false;
            
    var function_opened                = false;
            
    var parameter_opened            = false;

            
    var var_map                        = new VariableMap();
            
    var cur_var_map                    = var_map;
            
    var execute_opened                = false;

            
    //按分割字,分块显示
            for (var i=0; i <=word_index; i++){

                
    //单独处理指针引用
                if(call_opened&&typeof(codeArr[i])!="undefined"){                
                    
    if(call_string.length==0){
                        
    if(this.isVar(codeArr[i])){
                            call_string 
    +=codeArr[i];
                        }
    else{
                            htmlTxt[htmlTxt.length] 
    = "[\"" + this.toHex(call_string) + "\"]";
                            
    if(codeArr[i]!=this._call){
                                htmlTxt[htmlTxt.length] 
    = codeArr[i];                        
                                call_opened 
    = false;        
                            }

                            call_string 
    = "";
                        }

                    }
     else {
                        
    if(!this.isVar(codeArr[i])){
                            htmlTxt[htmlTxt.length] 
    = "[\"" + this.toHex(call_string) + "\"]";
                            
    if(codeArr[i]!=this._call){
                                htmlTxt[htmlTxt.length] 
    = codeArr[i];                            
                                call_opened 
    = false;    
                            }

                            call_string 
    = "";
                        }
    else{
                            htmlTxt[htmlTxt.length] 
    = "[\"" + this.toHex(call_string) + "\"]";
                        }

                    }

                    
    continue;
                }

                
                
    //处理空行(由于转义带来)
                if(typeof(codeArr[i])=="undefined"||codeArr[i].length==0){
                    
    continue;
                }
     else if(codeArr[i]==" "){
                    htmlTxt[htmlTxt.length] 
    = " ";
                }
     else if(codeArr[i]=="\n"){
                
    //处理换行
                }
     else if (codeArr[i] == "\r"){                                                                    
                    slash_slash_comment_opened 
    = false;        
                    quote_opened 
    = false;
                    var_opened 
    = false;
                    htmlTxt[htmlTxt.length] 
    = "\r\n";    
                    line_num
    ++;
                
    //处理function里的参数标记
                }
     else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&this.isFunction(codeArr[i])){
                    htmlTxt[htmlTxt.length] 
    = codeArr[i];
                    function_opened 
    = true;
                }
     else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]=="("){
                    htmlTxt[htmlTxt.length] 
    = codeArr[i];
                    
    if(function_opened == true){
                        function_opened 
    =false;
                        var_opened 
    = true;
                        cur_var_map 
    = new VariableMap(cur_var_map);
                        cur_var_map.isParameter 
    = true;
                    }

                }
     else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==")"){
                    htmlTxt[htmlTxt.length] 
    = codeArr[i];
                    
    //处理var a = new Class(),b=new Date();类似的问题
                    if(cur_var_map.isParameter){
                        var_opened 
    = false;
                        var_pause 
    = false;
                    }

                }
     else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==";"){
                    htmlTxt[htmlTxt.length] 
    = codeArr[i];
                    var_opened 
    = false;
                    var_pause 
    = false;
                    
    if(execute_opened){    
                        execute_opened 
    = false;
                    }

                }
     else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._var){
                    htmlTxt[htmlTxt.length] 
    = codeArr[i];
                    var_opened 
    = true;
                    var_pause 
    = false;
                }
     else if(!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._varPause){
                    htmlTxt[htmlTxt.length] 
    = codeArr[i];
                    var_pause 
    = true;
                }
     else if(!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._varContinue){
                    htmlTxt[htmlTxt.length] 
    = codeArr[i];
                    var_pause 
    = false;
                }
     else if(!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._beginBlock){
                    cur_var_map 
    = new VariableMap(cur_var_map);
                    var_opened 
    = false;
                    htmlTxt[htmlTxt.length] 
    = codeArr[i];
                }
     else if(!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._endBlock){
                    cur_var_map 
    = cur_var_map.parent;
                    
    if(cur_var_map.isParameter){
                        cur_var_map 
    = cur_var_map.parent;
                    }

                    htmlTxt[htmlTxt.length] 
    = codeArr[i];
                
    //处理引用调用
                }
     else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._call){
                    
    //判断引用(.)后面第一个是否为字母货_$
                    if(i<word_index-1){
                        
    if(this.isVar(codeArr[i+1])){                        
                            
    if(call_opened){
                                htmlTxt[htmlTxt.length] 
    = this.toHex(call_string);
                            }

                            call_opened 
    = true;    
                        }
    else{
                            htmlTxt[htmlTxt.length] 
    = this._call;
                        }

                    }
    else{
                        htmlTxt[htmlTxt.length] 
    = this._call;
                    }

                
    //处理关键字
                }
     else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && this.isKeyword(codeArr[i])){        
                  htmlTxt[htmlTxt.length] 
    = codeArr[i];
                
    //处理eval后的字符串
                }
     else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && codeArr[i]==this._execute){        
                  htmlTxt[htmlTxt.length] 
    = "window[\"" + this.toHex(codeArr[i]) + "\"]";
                  execute_opened 
    = true;
                
    //window内置对象
                }
     else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && this.isWindow(codeArr[i])){        
                  htmlTxt[htmlTxt.length] 
    = "window[\"" + this.toHex(codeArr[i]) + "\"]";
                
    //处理普通对象
                }
     else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && this.isCommonObject(codeArr[i])){    
                    htmlTxt[htmlTxt.length] 
    =  "window[\"" + this.toHex(codeArr[i]) + "\"]";
                
    //处理双引号(引号前不能为转义字符)    
                }
     else if (!slash_star_comment_opened&&!slash_slash_comment_opened&&this._quotation.contains(codeArr[i])){                                                    
                    
    if (quote_opened){
                        
    //是相应的引号
                        if(quote_char==codeArr[i]){
                            htmlTxt[htmlTxt.length] 
    = codeArr[i];                    
                            quote_opened    
    = false;
                            quote_char        
    = "";
                        }
     else {
                            htmlTxt[htmlTxt.length] 
    = this.toHex(codeArr[i]);            
                        }

                    }
     else {
                        htmlTxt[htmlTxt.length] 
    =  codeArr[i];
                        quote_opened    
    = true;
                        quote_char        
    = codeArr[i];
                    }
                        
                
    //处理转义字符
                }
     else if(codeArr[i] == this._escape){    
                    htmlTxt[htmlTxt.length] 
    = codeArr[i]; 
                    
    if(i<word_index-1){
                        
    if(codeArr[i+1].charCodeAt(0)>=32&&codeArr[i+1].charCodeAt(0)<=127){
                            htmlTxt[htmlTxt.length] 
    = codeArr[i+1].substr(0,1);
                            htmlTxt[htmlTxt.length] 
    = this.toHex(codeArr[i+1].substr(1));
                            i
    =i+1;
                        }

                    }
                
                
    //处理多行注释的开始
                }
     else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._commentOn,codeArr,i)){                                                
                    slash_star_comment_opened 
    = true;
                    htmlTxt[htmlTxt.length] 
    = this._commentOn;
                    i 
    = i + this.getSkipLength(this._commentOn);    
                
    //处理单行注释
                }
     else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._lineComment,codeArr,i)){                                                
                    slash_slash_comment_opened 
    = true;
                    
    if(!this._deleteComment){
                        htmlTxt[htmlTxt.length] 
    =  this._lineComment;
                    }

                    i 
    = i + this.getSkipLength(this._lineComment);    
                
    //处理忽略词
                }
     else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._ignore,codeArr,i)){                                                
                    slash_slash_comment_opened 
    = true;
                    htmlTxt[htmlTxt.length] 
    = this._ignore;
                    i 
    = i + this.getSkipLength(this._ignore);                    
                
    //处理多行注释结束    
                }
     else if (!quote_opened&&!slash_slash_comment_opened&&this.isStartWith(this._commentOff,codeArr,i)){                                
                    
    if (slash_star_comment_opened) {
                        slash_star_comment_opened 
    = false;
                        
    if(!this._deleteComment){
                            htmlTxt[htmlTxt.length] 
    =  this._commentOff;
                        }

                        i 
    = i + this.getSkipLength(this._commentOff);        
                    }

                }
     else {
                    
    //不是在字符串中
                    if(!quote_opened){
                        
    //如果不是在注释重
                        if(!slash_slash_comment_opened && !slash_star_comment_opened){    
                            
    //不是在定义变量时
                            if(!var_opened){
                                
    if(this.translateVar(cur_var_map,codeArr[i])==""){
                                    htmlTxt[htmlTxt.length] 
    = codeArr[i];
                                }
    else{
                                    htmlTxt[htmlTxt.length] 
    = this.translateVar(cur_var_map,codeArr[i]);
                                }

                            }
    else{
                                
    //不是在暂停变量定义时
                                if(var_pause){
                                    
    if(this.translateVar(cur_var_map,codeArr[i])==""){
                                        htmlTxt[htmlTxt.length] 
    = codeArr[i];
                                    }
    else{
                                        htmlTxt[htmlTxt.length] 
    = this.translateVar(cur_var_map,codeArr[i]);
                                    }
                                    
                                }
    else{
                                    
    //变量符合命名规则,并且(变量前为空格或制表符或逗号如:var a;var    a;var a,b;,还有如果是函数参数,如:function(a,b,c)
                                    if(this.isVar(codeArr[i])&&(i>0&&codeArr[i-1]==" "||codeArr[i-1]=="\t"||codeArr[i-1]==this._varContinue||cur_var_map.isParameter)){
                                        
    var name = this.getRandName();                                
                                        cur_var_map.add(codeArr[i],name);
                                        htmlTxt[htmlTxt.length] 
    = this.translateVar(cur_var_map,codeArr[i]);
                                    }
    else{
                                        htmlTxt[htmlTxt.length] 
    = codeArr[i];
                                    }

                                }

                            }

                        
    //注释中                            
                        }
    else{
                            
    if(!this._deleteComment){
                                htmlTxt[htmlTxt.length] 
    = codeArr[i];
                            }

                        }

                    }
    else{
                        
    if(execute_opened){
                            
    if(this.translateVar(cur_var_map,codeArr[i])==""){
                                htmlTxt[htmlTxt.length] 
    = codeArr[i];
                            }
    else{
                                htmlTxt[htmlTxt.length] 
    = this.translateVar(cur_var_map,codeArr[i]);
                            }

                        }
    else{
                            htmlTxt[htmlTxt.length] 
    = this.toHex(codeArr[i]);
                        }

                    }

                }

                
            }


            
    return htmlTxt.join("");
        }


        
    this.isStartWith = function(str,code,index){

            
    if(typeof(str)!="undefined"&&str.length>0){        
                
    var cc = new Array();            
                
    for(var i=index;i<index+str.length;i++){
                    cc[cc.length] 
    = code[i];
                }

                
    var c = cc.join("");
                
    if(this._caseSensitive){
                    
    if(str.length>=code[index].length&&c.indexOf(str)==0){
                        
    return true;
                    }

                }
    else{
                    
    if(str.length>=code[index].length&&c.toLowerCase().indexOf(str.toLowerCase())==0){
                        
    return true;
                    }

                }

                
    return false;

            }
     else {
                
    return false;
            }

        }


        
    this.isFunction = function(val){
            
    return this._function.contains(this._caseSensitive?val:val.toLowerCase());
        }

        
        
    this.isKeyword = function(val) {        
            
    return this._keywords.contains(this._caseSensitive?val:val.toLowerCase());
        }


        
    this.isWindow = function(val) {        
            
    return this._window.contains(this._caseSensitive?val:val.toLowerCase());
        }


        
    this.isCommonObject = function(val) {
            
    return this._commonObjects.contains(this._caseSensitive?val:val.toLowerCase());
        }


        
    this.getSkipLength = function(val){    
            
    var count = 0;
            
    for(var i=0;i<val.length;i++){
                
    if(this._wordDelimiters.indexOf(val.charAt(i))>=0){
                    count
    ++;
                }

            }

            
    if(count>0){
                count
    =count-1;
            }

            
    return count;
        }


        
    //字符串转换为16进制形式
        this.toHex = function(val){
            
    var str = new Array();
            
    for(var i=0;i<val.length;i++){
                
    var c = val.charCodeAt(i);
                
    if(c>=0&&c<256){
                    str[str.length] 
    = "\\x" + val.charCodeAt(i).toString(16);
                }
    else{
                    str[str.length] 
    = "\\u" + val.charCodeAt(i).toString(16);
                }

            }

            
    return str.join("");
        }


        
    //获得变量随机名
        this.getRandName = function(){
            
    var style = parseInt(Math.random()*4);
            
    var len = parseInt(Math.random()*9)+1;
            
    var n = [];

            
    this._varNum++;
            
    var c = "abcdefghijklmnopqrstuvwsyzABCDEFGHIJKLMNOPQRSTUVWXYZ_$";

            
    for(var i=0;i<len;i++){
                n[n.length] 
    = c.charAt(parseInt(Math.random()*54)); 
            }


            
    return n.join("")+this._varNum;

        }


        
    //是否符合变量命名字首规则
        this.isVar = function(val){
            
    return /^[a-zA-Z_\$].*$/.test(val);
        }


        
    //翻译变量,如果返回为空则不存在此变量
        this.translateVar = function(node,key){
            
    if(node.contains(key)){
                
    return node.items(key);
            }


            
    var cn = node.parent;
            
    while(cn!=null){
                
    if(cn.contains(key)){
                    
    return cn.items(key);
                }

                cn 
    = cn.parent;        
            }

            
    return "";    
        }



    }


    function doConfusion(o){
        
    var htmltxt = "";

        
    if (o == null){
            alert(
    "domNode is null!");
            
    return;
        }


        
    var _codetxt = "";
        
        
    if(typeof(o)=="object"){
            
    switch(o.tagName){
                
    case "TEXTAREA":
                
    case "INPUT":
                    _codetxt 
    = o.value;
                    
    break;
                
    case "DIV":
                
    case "SPAN":
                    _codetxt 
    = o.innerText;
                    
    break;
                
    default:
                    _codetxt 
    = o.innerHTML;
                    
    break;
            }

        }
    else{
            _codetxt 
    = o;
        }


        
    var _syn = new CLASS_CONFUSION(_codetxt);
        htmltxt 
    = _syn.confusion();
        
    return  htmltxt;
    }



    function go()
    {
        
    var code    = document.getElementById("code").value;
        
    var xx      = new CLASS_CONFUSION(code);    
        
    var a       = new Date();
        document.getElementById(
    "display").value = xx.confusion();
        alert(
    "共花:" + (new Date().getTime()-a.getTime()) + "ms");
    }

    //-->
    </SCRIPT>
    <TEXTAREA id=code rows=12 cols=100>
    /*
    这个是一个类
    */
    function xx(num,str)
    {
    //说明
    var a = num;
    this.aa = a;
    this.bb = function(){alert(str);}
    this.cc = function(){for(var i=0;i
    <10;i++){document.title=i;}}
    }

    xx.prototype.dd
    = function(){
    alert("dd");
    }

    var a 
    = new xx(100,"hello"),b=new xx(0,"ttyp");
    eval("a.aa
    =20");
    a.bb();
    b.dd();
    alert(a.aa);

    </TEXTAREA
    > <BR><INPUT onclick=go() type=button value=go><br>
    <textarea id=display rows=12 cols=100>
    </textarea>
    </BODY></HTML>

    最后,本人原则上不赞成代码混淆加密,写本程序是出于研究目的,本程序本人原创,后续的代码压缩等功能陆续加上,程序中有任何问题请指正,任何转载请写明出处。
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  • 原文地址:https://www.cnblogs.com/ttyp/p/354057.html
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