Last active

Embed URL

HTTPS clone URL

SSH clone URL

You can clone with HTTPS or SSH.

Download Gist

A Super simple encryption cipher using XOR and Base64 in JavaScript

View XORCipher.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
// XORCipher - Super simple encryption using XOR and Base64
//
// Depends on [Underscore](http://underscorejs.org/).
//
// As a warning, this is **not** a secure encryption algorythm. It uses a very
// simplistic keystore and will be easy to crack.
//
// The Base64 algorythm is a modification of the one used in phpjs.org
// * http://phpjs.org/functions/base64_encode/
// * http://phpjs.org/functions/base64_decode/
//
// Examples
// --------
//
// XORCipher.encode("test", "foobar"); // => "EgocFhUX"
// XORCipher.decode("test", "EgocFhUX"); // => "foobar"
//
/* jshint forin:true, noarg:true, noempty:true, eqeqeq:true, strict:true,
undef:true, unused:true, curly:true, browser:true, indent:2, maxerr:50 */
/* global _ */
(function(exports) {
"use strict";
 
var XORCipher = {
encode: function(key, data) {
data = xor_encrypt(key, data);
return b64_encode(data);
},
decode: function(key, data) {
data = b64_decode(data);
return xor_decrypt(key, data);
}
};
 
var b64_table = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
 
function b64_encode(data) {
var o1, o2, o3, h1, h2, h3, h4, bits, r, i = 0, enc = "";
if (!data) { return data; }
do {
o1 = data[i++];
o2 = data[i++];
o3 = data[i++];
bits = o1 << 16 | o2 << 8 | o3;
h1 = bits >> 18 & 0x3f;
h2 = bits >> 12 & 0x3f;
h3 = bits >> 6 & 0x3f;
h4 = bits & 0x3f;
enc += b64_table.charAt(h1) + b64_table.charAt(h2) + b64_table.charAt(h3) + b64_table.charAt(h4);
} while (i < data.length);
r = data.length % 3;
return (r ? enc.slice(0, r - 3) : enc) + "===".slice(r || 3);
}
 
function b64_decode(data) {
var o1, o2, o3, h1, h2, h3, h4, bits, i = 0, result = [];
if (!data) { return data; }
data += "";
do {
h1 = b64_table.indexOf(data.charAt(i++));
h2 = b64_table.indexOf(data.charAt(i++));
h3 = b64_table.indexOf(data.charAt(i++));
h4 = b64_table.indexOf(data.charAt(i++));
bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;
o1 = bits >> 16 & 0xff;
o2 = bits >> 8 & 0xff;
o3 = bits & 0xff;
result.push(o1);
if (h3 !== 64) {
result.push(o2);
if (h4 !== 64) {
result.push(o3);
}
}
} while (i < data.length);
return result;
}
 
function keyCharAt(key, i) {
return key.charCodeAt( Math.floor(i % key.length) );
}
 
function xor_encrypt(key, data) {
return _.map(data, function(c, i) {
return c.charCodeAt(0) ^ keyCharAt(key, i);
});
}
 
function xor_decrypt(key, data) {
return _.map(data, function(c, i) {
return String.fromCharCode( c ^ keyCharAt(key, i) );
}).join("");
}
 
exports.XORCipher = XORCipher;
 
})(this);

Hi,
What is the license applied on XORCipher.js ? MIT ?
Thanks

Thanks a lot for the code. I'm using it for SafeMessage which is an open-source freely-distributed project for exchanging messages securely. An alpha version is now running at http://opentox.ntua.gr/safemsg/create.php.

@alphaville I hope you know this is a highly insecure encryption algorithm. (not meant to be used for encryption of secret messages) You won't be able to exchange message securely...

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Something went wrong with that request. Please try again.