[Java Script] Protejare fisiere .js

[XdotY]

De multe ori mi s-a intamplat ca dupa ce m-am chinuit zile,chiar saptamani la diferite scripturi JS,sa ma trezesc ca vine cate unul si altul si imi fura codul fara sa lase un © macar ,asa ca mi-am dezvoltat propria metoda de encriptie.Ma folosesc de ASP si cookieuri pentru a encripta codul in cadrul functiilor Java Script.Bineinteles exista o metoda de a trece peste aceasta encriptie zi a decoda codul,insa 99% din useri nu vor reusii,asa ca este o metoda cat se poate de buna.

Sursa:

http://rapidshare.com/files/235556770/Encryption_js.zip.html

cipher.js

var cipher_block_size=64, encoding_buffer=1024;
function b0f(c) {
	return c < 16 ? '0' + c.toString(16) : c.toString(16);
}
function bff(c) {
	return parseInt(c, 16);
}
function salt(s) {
	var n = 0;
	for (var i=0; i<s.length; i++) n += i&s.charCodeAt(i);
	return b0f(n%256);
}
function encrypt(s,k) {
	if (s.length > cipher_block_size) {
		var m=parseInt(s.length/cipher_block_size), t=Math.round(m/2)*cipher_block_size;
		return encrypt(s.substr(0, t), k) + encrypt(s.substr(t), k);
	}
	var r=parseInt(Math.random()*256), o=b0f(r), i;
	for (i=0; i<s.length; i++) {
		o += b0f(s.charCodeAt(i)^r^k.charCodeAt(i%k.length));
	}
	return o;
}
function decrypt(s,k) {
	var dbs = (cipher_block_size+1)*2;
	if (s.length > dbs) {
		var m=parseInt(s.length/dbs), t=Math.round(m/2)*dbs;
		return decrypt(s.substr(0, t), k) + decrypt(s.substr(t), k);
	}
	var n=bff(s.substr(0,2)), o='';
	for (var i=2; i<s.length; i+=2) {
		o += String.fromCharCode(bff(s.substr(i,2))^n^k.charCodeAt((i-2)/2%k.length));
	}
	return o;
}
function encipher(f) {
	var s=f.stream.value, k=salt(f.key.value), r=k, b=encoding_buffer,
		p=0, n=Math.floor(s.length/b)+1;
	while (n > p++) {
		self.status = 'Encrypting block ' + p + '/' + n;
		r += encrypt(s.substr((p-1)*b, , f.key.value);
	}
	f.stream.value = r;
	self.status = 'Done';
}
function decipher(f) {
	var s=f.stream.value.substr(2), k=salt(f.key.value), r='',
		b=2*(encoding_buffer+encoding_buffer/cipher_block_size), p=0, n=Math.floor(s.length/b)+1;
	if (k != f.stream.value.substr(0, 2)) {
		if (!confirm('The key is probably incorrect.\nContinue decryption?'))
			return;
	}
	while (p++ < n) {
		self.status = 'Decrypting block ' + p + '/' + n;
		r += decrypt(s.substr((p-1)*b, , f.key.value);
	}
	f.stream.value = r;
	return self.status = 'Done';
}

cookies.js

function setCookie(name, value, expires, path, domain, secure) {
  var curCookie = name + "=" + escape(value) +
      ((expires) ? "; expires=" + expires.toGMTString() : "") +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      ((secure) ? "; secure" : "");
  document.cookie = curCookie;
}


function getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1)
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}


function deleteCookie(name, path, domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" + 
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}


function fixDate(date) {
  var base = new Date(0);
  var skew = base.getTime();
  if (skew > 0)
    date.setTime(date.getTime() - skew);
}

serverCipher.js

<%
var cipher_block_size=64, encoding_buffer=1024;
function b0f(c) {
	return c < 16 ? '0' + c.toString(16) : c.toString(16);
}
function bff(c) {
	return parseInt(c, 16);
}
function salt(s) {
	var n = 0;
	for (var i=0; i<s.length; i++) n += i&s.charCodeAt(i);
	return b0f(n%256);
}
function encrypt(s,k) {
	if (s.length > cipher_block_size) {
		var m=parseInt(s.length/cipher_block_size), t=Math.round(m/2)*cipher_block_size;
		return encrypt(s.substr(0, t), k) + encrypt(s.substr(t), k);
	}
	var r=parseInt(Math.random()*256), o=b0f(r), i;
	for (i=0; i<s.length; i++) {
		o += b0f(s.charCodeAt(i)^r^k.charCodeAt(i%k.length));
	}
	return o;
}
function decrypt(s,k) {
	var dbs = (cipher_block_size+1)*2;
	if (s.length > dbs) {
		var m=parseInt(s.length/dbs), t=Math.round(m/2)*dbs;
		return decrypt(s.substr(0, t), k) + decrypt(s.substr(t), k);
	}
	var n=bff(s.substr(0,2)), o='';
	for (var i=2; i<s.length; i+=2) {
		o += String.fromCharCode(bff(s.substr(i,2))^n^k.charCodeAt((i-2)/2%k.length));
	}
	return o;
}
function encipher(f) {
	var s=f.stream.value, k=salt(f.key.value), r=k, b=encoding_buffer,
		p=0, n=Math.floor(s.length/b)+1;
	while (n > p++) {
		self.status = 'Encrypting block ' + p + '/' + n;
		r += encrypt(s.substr((p-1)*b, , f.key.value);
	}
	f.stream.value = r;
	self.status = 'Done';
}
function decipher(f) {
	var s=f.stream.value.substr(2), k=salt(f.key.value), r='',
		b=2*(encoding_buffer+encoding_buffer/cipher_block_size), p=0, n=Math.floor(s.length/b)+1;
	if (k != f.stream.value.substr(0, 2)) {
		if (!confirm('The key is probably incorrect.\nContinue decryption?'))
			return;
	}
	while (p++ < n) {
		self.status = 'Decrypting block ' + p + '/' + n;
		r += decrypt(s.substr((p-1)*b, , f.key.value);
	}
	f.stream.value = r;
	return self.status = 'Done';
}
%>

main.asp

<%@Language=JAVAScript%>


<!--#include file="serverCipher.js"-->


<%
var randomKey = "";
var i;
for (i=0; i < 4; i++)
{
	randomKey += "" + Math.round(10 * Math.random(),0);
}
Response.Cookies.Item("Key") = randomKey;
%>

<HTML>
<HEAD>
<TITLE>My main page</TITLE>
</HEAD>
<BODY>


<script src="cookies.js">
</script>
<script src="cipher.js">
</script>


<% 
function escapeJS(s) {
	Response.Write("eval(decrypt(\"" + encrypt(s,randomKey) + "\",a));" + "\n");
}


%>
<script>
function secretFunction() {
	var a = getCookie("Key");
	<%
		//encripted code
		escapeJS("var b = 1;");
		escapeJS("var c = 1;");
		escapeJS("alert('The result is : ' + (b + c));");
	%>
}
</script>

<P>	Welcome to XdotY's home page...</P>

<input type="button" value="Secret calculation..." onclick="secretFunction()">

</BODY>
</HTML>

Edited May 21, 2009 by XdotY