tweetStego

stego-bookmarklet

javascript:(function(s){s=document.createElement('script');document.body.appendChild(s);s.onload=function(){TSWidget()};s.src='https://cdn.rawgit.com/plugnburn/bc773a2f912acba406ef/raw/tweetStego.js'})(),void 0

tweetStego.js

TS = {
	codeAlphabet: '.abcdefghijklmnopqrstuvwxyz +-@#',
	coverAlphabets: [
		'aceijopsxyABCEFHIJKMNOPSTXYZ \u200b',
		'\u0430\u0441\u0435\u0456\u0458\u043e\u0440\u0455\u0445\u0443\u0410\u0412\u0421\u0415\u03dc\u041d\u0406\u0408\u041a\u041c\u039d\u041e\u0420\u0405\u0422\u0425\u03a5\u0396\u2005\u200c'
	],
	//return array of the cover text positions where hidden message bits can be placed according to the cover alphabets
	//params: cover text
	calcCoverTextPositions: function(coverText) {
		var i, positions=[], t=this, c;
		for(i=0;i<coverText.length;i++) {
			c = coverText[i];
			if(~t.coverAlphabets[0].indexOf(c) || ~t.coverAlphabets[1].indexOf(c)) {
				positions.push(i);
			}
		}
		return positions;
	},
	//main API functions
	hide: function(msg, coverText) {
		var t=this, ctPositions=[], i, p, c;
		msg=msg.replace(/\s+/g,' ').toLowerCase().replace(/[^a-z\d +-@]+/g,'').trim().replace(/at/g,'@')
		.replace(/\d+/g,function(seq){
			return'#'+seq.replace(/\d/g,function(d){return t.codeAlphabet[1+(d|0)]})+'#'
		})+'.';
		bits = msg.split('').map(function(c){return('00000'+t.codeAlphabet.indexOf(c).toString(2)).slice(-5)}).join('');
		do {
			ctPositions = t.calcCoverTextPositions(coverText);
			if(ctPositions.length<bits.length) coverText+='\u200b';
		} while(ctPositions.length<bits.length)
		for(i=0;i<ctPositions.length;i++) {
			if(i>bits.length) break;
			p = ctPositions[i];
			c = t.coverAlphabets[0].indexOf(coverText[p]);
			if(~c && bits[i]==1) coverText = coverText.slice(0,p)+t.coverAlphabets[1][c]+coverText.slice(p+1);
		}
		return coverText;
	},
	reveal: function(coverText) {
		var t=this, bits='', ctPositions = t.calcCoverTextPositions(coverText), i, c;
		for(i=0;i<ctPositions.length;i++) {
			c = coverText[ctPositions[i]];
			if(~t.coverAlphabets[0].indexOf(c)) bits += '0';
			else if(~t.coverAlphabets[1].indexOf(c)) bits += '1';
		}
		return bits.match(/.{5}/g).map(function(s){return t.codeAlphabet[parseInt(s,2)]}).join('').replace(/#[a-j]+#/g,function(seq){
			return seq.replace(/[a-j#]/g,function(d,i){i=t.codeAlphabet.indexOf(d);return i==31?'':(i-1)})
		}).replace(/@/g,'at').replace(/\.+$/,'').trim()
	}
};

//Widget

TSWidget = function() {
	if(document.querySelector('[data-stegosaurus]')) return;
	var widgetBlk = document.createElement('div'), widgetId = 'stegoWidget'+(Math.random()*32768|0)
	widgetBlk.id = widgetId;
	widgetBlk.setAttribute('data-stegosaurus', widgetId);
	widgetBlk.style.cssText = "box-sizing:border-box;background-color:#DDD!important;opacity:0.8;max-width:200px;width:100%;font:14px Arial,'Droid Sans','Liberation Sans',sans-serif;text-align:center;position:fixed;left:0;top:50%;-webkit-transition:all 0.5s ease;-moz-transition:all 0.5s ease;-o-transition:all 0.5s ease;transition:all 0.5s ease;padding:10px;border-radius:6px;z-index:100500";
	
	var widgetTitle = document.createElement('div');
	widgetTitle.innerHTML = 'Stegosaurus';
	widgetTitle.style.cssText = 'font-size:2em;box-sizing:border-box;-webkit-user-select:none;-moz-user-select:none;user-select:none';
	var coverArea = document.createElement('textarea'), msgArea = document.createElement('textarea');
	coverArea.style.cssText = msgArea.style.cssText = 'background-color:#eee;box-sizing:border-box;font:inherit;display:block;resize:none;outline:none;border:1px solid #ccc!important;width:100%;margin:5px auto;padding:5px;border-radius:5px;';
	coverArea.rows = 7;
	coverArea.placeholder = 'Cover text (plain or encoded)';
	msgArea.rows = 3;
	msgArea.placeholder = 'Secret message';
	var controlPanel = document.createElement('div');
	controlPanel.style.padding = '10px 0';
	controlPanel.style.boxSizing = 'border-box';
	var hideBtn = document.createElement('button');hideBtn.innerHTML = 'Hide';
	var revealBtn = document.createElement('button');revealBtn.innerHTML = 'Reveal';
	hideBtn.style.cssText = revealBtn.style.cssText = 'font:inherit;width:45%;max-width:90px;text-align:center;-moz-appearance: button!important;-webkit-appearance:button!important;appearance:button!important';
	hideBtn.onclick = function(){coverArea.value=TS.hide(msgArea.value,coverArea.value);coverArea.focus()}
	revealBtn.onclick = function(){msgArea.value=TS.reveal(coverArea.value)}
	coverArea.onfocus = function(){setTimeout(function(){coverArea.select()},15)}
	controlPanel.appendChild(hideBtn);
	controlPanel.appendChild(revealBtn);
	
	widgetBlk.appendChild(widgetTitle);
	widgetBlk.appendChild(coverArea);
	widgetBlk.appendChild(msgArea);
	widgetBlk.appendChild(controlPanel);
	
	widgetBlk.onmouseover = function(){widgetBlk.style.marginLeft=0}
	widgetBlk.onmouseout = function(){widgetBlk.style.marginLeft = '-'+(widgetBlk.clientWidth-10)+'px'}	
	document.body.appendChild(widgetBlk);
	widgetBlk.style.marginLeft = '-'+(widgetBlk.clientWidth-10)+'px'; 
	widgetBlk.style.marginTop = '-'+(widgetBlk.clientHeight/2)+'px';

}