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分类: Java

2009-09-24 09:58:56

 
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.
 
 

<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>


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