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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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