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encode_base64.js.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Source: encode/base64.js</title>
<script src="scripts/prettify/prettify.js"> </script>
<script src="scripts/prettify/lang-css.js"> </script>
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
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<div id="main">
<h1 class="page-title">Source: encode/base64.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>//
// Copyright (c) 2006-2020 Wade Alcorn - wade@bindshell.net
// Browser Exploitation Framework (BeEF) - http://beefproject.com
// See the file 'doc/COPYING' for copying permission
//
// Base64 code from http://stackoverflow.com/questions/3774622/how-to-base64-encode-inside-of-javascript/3774662#3774662
beef.encode = {};
/**
* Base64 code from http://stackoverflow.com/questions/3774622/how-to-base64-encode-inside-of-javascript/3774662#3774662
* @namespace beef.encode.base64
*/
beef.encode.base64 = {
keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
/**
* @memberof beef.encode.base64
* @param {string} input
* @return {string}
*/
encode : function (input) {
if (window.btoa) {
return btoa(unescape(encodeURIComponent(input)));
}
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
input = beef.encode.base64.utf8_encode(input);
while (i < input.length) {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output +
this.keyStr.charAt(enc1) + this.keyStr.charAt(enc2) +
this.keyStr.charAt(enc3) + this.keyStr.charAt(enc4);
}
return output;
},
/**
* @memberof beef.encode.base64
* @param {string} input
* @return {string}
*/
decode : function (input) {
if (window.atob) {
return escape(atob(input));
}
var output = "";
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
while (i < input.length) {
enc1 = this.keyStr.indexOf(input.charAt(i++));
enc2 = this.keyStr.indexOf(input.charAt(i++));
enc3 = this.keyStr.indexOf(input.charAt(i++));
enc4 = this.keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
}
output = beef.encode.base64.utf8_decode(output);
return output;
},
/**
* @memberof beef.encode.base64
* @param {string} string
* @return {string}
*/
utf8_encode : function (string) {
string = string.replace(/\r\n/g,"\n");
var utftext = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
}
else if((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
}
else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
},
/**
* @memberof beef.encode.base64
* @param {string} utftext
* @return {string}
*/
utf8_decode : function (utftext) {
var string = "";
var i = 0;
var c = c1 = c2 = 0;
while ( i < utftext.length ) {
c = utftext.charCodeAt(i);
if (c < 128) {
string += String.fromCharCode(c);
i++;
}
else if((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i+1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
}
else {
c2 = utftext.charCodeAt(i+1);
c3 = utftext.charCodeAt(i+2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
}
};
beef.regCmp('beef.encode.base64');
</code></pre>
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