// -----------------------------------------------------------------------
// rot13 v 0.0.1
//
// Written by Devadutta Ghat
//
// Last updated on May 13, 2007
//
// Tested on Greasemonkey 0.6.9
//
// What it does: Encrypts the contents of a text box using rot13 cipher
// when you click on the "e13" button next to the textbox.
//
// Why was this created?
// Many a times, I have encoded contents of some textbox
// on sites like orkut.com just to attain some privacy
// and some fun. I used to do this using a C program.
// So, this Greasemonkey script makes life easier for those
// who want to use the cipher frequently by allowing easy access within the
// browser.
//
// Why rot13?
// rot 13 is symmetric, which means that
// encryption and decryption can be done by the same algorithm!
//
// Does it work?
// Tested on many sites and works well!
//
// Acknowledgments
// Sean M. Burke, Dive into Greasemonkey and Mozdev
// Uses Sean M. Burke's code to add the little image next to the textbox.
// ------------------------------------------------------------------------
//
// ==UserScript==
// @name rot13
// @namespace http://devadutta.net
// @description Encrypts the contents of a text box using the rot13 cipher at the click of a button!!
// @version 0.0.1
// @include *
// @author devadutta.net
// ==/UserScript==
var imSrc='data:image/gif;base64,'+
'iVBORw0KGgoAAAANSUhEUgAAADYAAAAbCAQAAACdfrS+AAAACXBIWXMAAAsTAAALEwEAmpwYAAAA'+
'BGdBTUEAALGOfPtRkwAAACBjSFJNAAB6JQAAgIMAAPn/AACA6QAAdTAAAOpgAAA6mAAAF2+SX8VG'+
'AAABYUlEQVR42uyWXZWDMBBGL3WAhSABC7GABSykEqgEKoFKqAVWAiuBSsg+MCRAExbabs/Zc0re'+
'+Jmbb+abCYnlfdeBD+y/wXjAIApDg4k+L6ixsmr0yLE7YYbKhTGRjbTuDQ/cDdOLEGFYd4eyWKoB'+
'tr1m+aYEKwDOZCQkZFwkI+m+mil6LBUGs6LsiqWc3RnSqpdpLGlEdo9ZUbIGiyV2BssD2W5E/OMw'+
'JdvvST1MB8tqaYO432HpwpPGu3GoxuCaVDqlndp2N6yMW3/snSJQWCv+ek5Z6WFdUIOK9tP2mhmX'+
'MzX2mQpIt3QvmIUnMr4F+4ZBfOPoR8IBuAFwJAmu05O4L6miwMaRkv+JNi0KBXZyDjKurzRGDoo9'+
'W6ix1JMvciox3sXPxjLS1FPXaees5dKTwzG8uvkRU0RCdW6fdTSUb5oqMofU/XlmuM4Uzau4RdmQ'+
'/m4WpfCik89/4yuunwEA7S9IhzC92ksAAAAASUVORK5CYII=';
function setCharAt(str, index, ch) {
return str.substr(0, index) + ch + str.substr(index + 1);
}
var allTextareas, thisTextarea;
allTextareas = document.getElementsByTagName('textarea');
for (var i = 0; i < allTextareas.length; i++) {
thisTextarea = allTextareas[i];
mark_textarea(allTextareas[i]);
}
function mark_textarea (t) {
var d = t.ownerDocument;
var s = getComputedStyle(t, "" );
var
oh = num(s.height),
ow = num(s.width ),
td2 = make_table(d,t),
button = d.createElement('img');
button.setAttribute('src',imSrc);
button.setAttribute('height',20);
button.setAttribute('width' ,20);
button.setAttribute('alt','grabby');
td2.appendChild(button);
td2.style.verticalAlign = "bottom";
button.title = "Click on me to encode contents!";
button.addEventListener('mousedown', function(event) {
// Yes, I think we really do need this as a closure here-- otherwise
// there's no (easy) way to work back from the event target to the textarea.
if(t.value.length==0)
{
//alert("Enter some text to encode");
return;
}
//alert(t.value.length);
var toEnc=t.value;
var count=0;
for(count=0;count<t.value.length;count++)
{
if(toEnc.charAt(count)==' ')
{
//Space No need to encode
}
else
{
if(toEnc.charCodeAt(count)>=65 && toEnc.charCodeAt(count)<=90)
{
var newChar=(((toEnc.charCodeAt(count)-65)+13)%26)+65;
toEnc=setCharAt(toEnc, count, String.fromCharCode(newChar));
}
else if(toEnc.charCodeAt(count)>=97 && toEnc.charCodeAt(count)<=122)
{
var newChar=(((toEnc.charCodeAt(count)-97)+13)%26)+97;
toEnc=setCharAt(toEnc, count, String.fromCharCode(newChar));
}
}
}
t.value=toEnc;
event.preventDefault();
return;
},
true
);
if(ow && oh) {
t.style.height = oh.toString() + "px";
t.style.width = ow.toString() + "px";
}
return;
}
function make_table (doc,textarea) {
var
table = doc.createElement( 'table' ),
tbody = doc.createElement( 'tbody' ),
tr = doc.createElement( 'tr' ),
td1 = doc.createElement( 'td' ),
td2 = doc.createElement( 'td' );
tr.appendChild(td1);
tr.appendChild(td2);
tbody.appendChild(tr);
table.appendChild(tbody);
textarea.parentNode.replaceChild( table, textarea );
td1.appendChild(textarea);
td1.style.verticalAlign = "bottom";
table.style.borderSpacing = "0px";
return td2;
}
function num (i) {
var m;
if(typeof(i) == "string") {
m = i.match( /(\d+)(\.\d+)*px/ );
// nota bene: yes, the computed style can be fractional, like "123.56px"!!
if(m) {
i = parseInt(m[1], 10);
} else {
//trace(1, "Weird pseudonumerical value: \"" + i + "\"!");
}
} else if(typeof(i) == "number") {
// just fall thru
} else {
//trace(1, "Weird nonnumerical value: \"" + i + "\"!");
}
//trace( typeof(i) + ": " + i.toString() );
return i;
}
