CODE EXAMPLE FOR JAVASCRIPT

hex decode and encode js

String.prototype.hexEncode = function(){
    var hex, i;

    var result = "";
    for (i=0; i<this.length; i++) {
        hex = this.charCodeAt(i).toString(16);
        result += ("00"+hex).slice(-2);
    }

    return result
}

String.prototype.hexDecode = function(){
    var j;
    var hexes = this.match(/.{1,2}/g) || [];
    var back = "";
    for(j = 0; j<hexes.length; j++) {
        back += String.fromCharCode(parseInt(hexes[j], 16));
    }

    return back;
}