C#/vbscript/JS如何加密保护HTML/javascript源代码
本文通过将源代码进行unicode转换后进行混淆加密，对HTML或者javascript源代码进行加密，将内容转换为一些看似乱码的内容，然后通过客户端的JS脚本反相解析回来。
HTML/javascript源代码加密混淆算法
1）ASCII编码内可见字符【33~126】，33~79进行+47操作操作，80~126进行-47操作
2）ASCII编码内部可见字符【0~32,127】，【128~133】，不操作，但是在后面增加【,】，变2个字符
3）其他，-5操作，后接@变2字符
客户端JS脚本解密函数
<script type="text/javascript">
_$_ = ["", "\x77\x72\x69\x74\x65", "\x6c\x65\x6e\x67\x74\x68", "\x63\x68\x61\x72\x43\x6f\x64\x65\x41\x74", "\x66\x72\x6f\x6d\x43\x68\x61\x72\x43\x6f\x64\x65", "\x73\x75\x62\x73\x74\x72", "\x40", "\x65"];
var a = { e: function (__0, __1) { var __2, __3, __4, __5 = _$_[0]; if (__1 == 0) { eval(__5) } else if (__1 == 1) { document[_$_[1]](__0) } else { for (__3 = 0; __3 < __0[_$_[2]]; __3++) { { __2 = __0[_$_[3]](__3); if (__2 >= 33 && __2 <= 79) { __5 = __5 + String[_$_[4]](__2 + 47) } else if (__2 >= 80 && __2 <= 126) { __5 = __5 + String[_$_[4]](__2 - 47) } else { __4 = __3 + 1; if (__0[_$_[5]](__4, 1) == _$_[6]) { __5 = __5 + String[_$_[4]](__2 + 5) } else { __5 = __5 + __0[_$_[5]](__3, 1) } __3++ } } } a[_$_[7]](__5, 1) } } };
//使用方法
//a.e("被加密混淆过的HTML或者javascript代码")
a.e("k2 ,9C67lQ9EEAi^^HHH]4@5:?8`ab]?6EQm缑@稆@讹@讜@罌@k^2mkD4C:AE ,EJA6lQE6IE^;2G2D4C:AEQm2=6CEW`abXk^D4C:AEm");
</script>
客户端JS脚本解密函数详解对照
//_$_ = ["", "\x77\x72\x69\x74\x65", "\x6c\x65\x6e\x67\x74\x68", "\x63\x68\x61\x72\x43\x6f\x64\x65\x41\x74", "\x66\x72\x6f\x6d\x43\x68\x61\x72\x43\x6f\x64\x65", "\x73\x75\x62\x73\x74\x72", "\x40", "\x65"];
_$_ = ["", "write", "length", "charCodeAt", "fromCharCode", "substr", "@", "e"]
var a = { e: function (__0, __1) {
var __2, __3, __4
//, __5 = _$_[0];
, __5 = ""; //用来保存实际解码成功后的内容
if (__1 == 0) {
//eval(__5)
eval("")
}
else if (__1 == 1) {
//document[_$_[1]](__0)
document.write(__0);
}
else {
//for (__3 = 0; __3 < __0[_$_[2]]; __3++) {
for (__3 = 0; __3 < __0.length; __3++) {
{
//__2 = __0[_$_[3]](__3);
__2 = __0.charCodeAt(__3); //获取当前字符数字编码
//当编码大于等于33且小于79的时候，对当前编码执行+47操作然后生成字符
if (__2 >= 33 && __2 <= 79) {//80~126为实际编码
//__5 = __5 + String[_$_[4]](__2 + 47)
__5 = __5 + String.fromCharCode(__2 + 47)
}
//当编码大于等于80且小于126的时候，对当前编码执行+47操作然后生成字符
else if (__2 >= 80 && __2 <= 126) {//33~79为实际编码
//__5 = __5 + String[_$_[4]](__2 - 47)
__5 = __5 + String.fromCharCode(__2 - 47)
}
/*33~79：PQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
80~126：!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO*/
else {//编码不在33~126之间
__4 = __3 + 1; //预读取
//if (__0[_$_[5]](__4, 1) == _$_[6]) { __5 = __5 + String[_$_[4]](__2 + 5) }
if (__0.substr(__4, 1) == "@") {//编码大于133的字符
//__5 = __5 + String[_$_[4]](__2 + 5)
__5 = __5 + String.fromCharCode(__2 + 5)
}
else {//ASCII表示范围内的不可见字符
// __5 = __5 + __0[_$_[5]](__3, 1)
__5 = __5 + __0.substr(__3, 1)
}
__3++;//通过算法2），3）知道这些内容占用2个字符，所以循环变量++到下一个字符
}
}
}
//a[_$_[7]](__5, 1)
//==>等价于
// a.e(__5, 1);
//==>等价于
document.write(__5);
}
}
};
下面贴出算法加密保护HTML/javascript实现源代码
javascript加密保护HTML/javascript实现源代码，一般很少用，因为是客户端的，不好直接读取文件进行加密
<script type="text/javascript">
function encrypt(v) {
var s = '',charCode;
for (var i = 0, len = v.length; i < len; i++) {
charCode = v.charCodeAt(i);
if (charCode >= 33 && charCode <= 79) s += String.fromCharCode(charCode + 47);
else if (charCode >= 80 && charCode <= 126) s += String.fromCharCode(charCode - 47);
else if ((charCode >= 0 && charCode <= 32) || (charCode >= 127 && charCode <= 133)) s += String.fromCharCode(charCode) + ',';
else s += String.fromCharCode(charCode - 5)+'@';
}
return s;
}
var s = '<a href="/">Web开发网</a><script type="text/javascript">alert(123)</'+'script>';
alert('“'+s+'”加密后内容为:“'+encrypt(s)+'”')
</script>
C#加密保护HTML/javascript实现源代码
public string encrypt(string v)
{
if (string.IsNullOrEmpty(v)) return "";
string s = "";
long charCode;
System.Text.Encoding unicode = System.Text.Encoding.Unicode;
for (int i = 0, len = v.Length; i < len; i++)
{
charCode = (long)v[i];
if (charCode >= 33 && charCode <= 79) s += ((char)(charCode + 47)).ToString();
else if (charCode >= 80 && charCode <= 126) s += ((char)(charCode - 47)).ToString();
else if ((charCode >= 0 && charCode <= 32) || (charCode >= 127 && charCode <= 133)) s += ((char)(charCode)).ToString() + ",";
else s += ((char)(charCode - 5)).ToString() + "@";
}
return s;
}
protected void Page_Load(object sender, EventArgs e)
{
string s = "<a href=\"/\">Web开发网</a>";
Response.Write("“" + s + "”加密后内容为:“" + encrypt(s) + "”");
}
vbscript加密保护HTML/javascript实现源代码
function encrypt(v)
dim s,charcode,vlen
vlen=len(v)
for i=1 to vlen
charcode=clng("&H"&(hex(AscW(mid(v,i,1)))))
if charCode >= 33 and charCode <= 79 then
s=s&chrw(charcode+47)
elseif charCode >= 80 and charCode <= 126 then
s=s&chrw(charcode-47)
elseif (charCode >= 0 and charCode <= 32) or (charCode >= 127 and charCode <= 133) then
s=s&chrw(charcode)&","
else
s=s&chrw(charcode-5)&"@"
end if
next
encrypt=s
end function
dim v
v = "<a href=""/"">Web开发网</a>"
response.Write "“"&v&"”加密后内容为:“"&encrypt(v)&"”"
综合示例，JavaScript实现HTML/javascript源代码加密和解密
<form method="post" onsubmit="return _de_encrypt(this)">
<b>要加密/解密的代码</b><br />
<textarea name="source" rows="6" cols="80"></textarea>
<br /><b>类型：</b><input type="radio" name="type"/>加密 <input type="radio" name="type"/>解密<br />
<b>加密/解密结果</b><br />
<textarea name="target" rows="6" cols="80" readonly="readonly"></textarea><br />
<input type="submit" value="开始"/></form>
<script type="text/javascript">
function _de_encrypt(f){
if(f.source.value==''){alert('请输入“要加密/解密的代码”！');f.source.focus();return false;}
if(!f.type[0].checked&&!f.type[1].checked){alert('请选择“类型”！');f.type[0].focus();return false;}
f.target.value=window[f.type[0].checked?'encrypt':'decrypt'](f.source.value);
return false;
}
function encrypt(v) {
var s = '',charCode;
for (var i = 0, len = v.length; i < len; i++) {
charCode = v.charCodeAt(i);
if (charCode >= 33 && charCode <= 79) s += String.fromCharCode(charCode + 47);
else if (charCode >= 80 && charCode <= 126) s += String.fromCharCode(charCode - 47);
else if ((charCode >= 0 && charCode <= 32) || (charCode >= 127 && charCode <= 133)) s += String.fromCharCode(charCode) + ',';
else s += String.fromCharCode(charCode - 5)+'@';
}
return s;
}
function decrypt(v){
var i,charCode,s='',preIndex;
for (i = 0; i < v.length; i++) {
charCode = v.charCodeAt(i);
if (charCode >= 33 && charCode <= 79)s = s + String.fromCharCode(charCode + 47);
else if (charCode >= 80 && charCode <= 126)s = s + String.fromCharCode(charCode - 47);
else{
preIndex = i + 1;
if (v.substr(preIndex, 1) == "@") s = s + String.fromCharCode(charCode + 5)
else s = s + v.substr(i, 1);
i++;
}
}
return s;
}
</script>
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