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<html>
<head>
<title>Entropy Generator Progress</title>
<!-- ProgressBar source: http://stackoverflow.com/questions/7190898/progress-bar-with-html-and-css -->
<style>
#progressbar {
background-color: black;
border-radius: 13px; /* (height of inner div) / 2 + padding */
padding: 3px;
}
#progressbar > div {
background-color: orange;
width: 0%; /* Adjust with JavaScript */
height: 20px;
border-radius: 10px;
}
</style>
<script type="text/javascript" src="../sjcl.js">
</script>
<script type="text/javascript">
var busy = 0;
var collecting = 0;
function showprogress () {
var barwidth = document.getElementById ("progresswidth");
var paranoia = parseInt (document.getElementById ("paranoialevel").value);
var progress = 100 * sjcl.random.getProgress (paranoia);
barwidth.style.width = progress+"%";
if (!sjcl.random.isReady (paranoia)) {
setTimeout ("showprogress()", 10, "JavaScript");
} else {
busy = 0;
document.getElementById ("startbutton").style.disabled = 1;
}
}
function startup () {
if (collecting == 0) {
sjcl.random.startCollectors ();
collecting = 1;
}
if (busy == 0) {
busy = 1;
document.getElementById ("startbutton").style.disabled = 1;
showprogress ();
}
}
function consume (numbits) {
var collector = document.getElementById ("collector");
collector.value = "retrieving random data";
var paranoia = document.getElementById ("paranoialevel").value;
var numwords = Math.ceil (numbits / 32);
var bits = sjcl.random.randomWords (numwords, paranoia);
collector.value = '';
for (var i=0; i<numwords; i++) {
var hi = (bits [i] >> 16) & 0x0000ffff;
var lo = bits [i] & 0x0000ffff;
collector.value = collector.value + hi.toString (16) + lo.toString (16);
}
startup ();
}
</script>
</head>
<body>
<h1>Entropy Generator Progress</h1>
<p>Target: 192 bits, available at paranoia level 5.</p>
<p>Corresponding paranoia level from [0,1..10]: <input type="text" value="5" id="paranoialevel"/> <input type=button onclick="startup ()" id="startbutton" value=" Start >> "> (the idea being that you can see the progress bar advance gently from empty/black to full/yellow after you press this)</p>
<p><input type=button onclick="consume (192)" value=" Consume 192 bits >> "><input type=text id=collector size=50 value="" onkeypress="consume (192)"> (also consumes 192 bits with every keypress in the text field; use key repeat to consume swiftly)</p>
<div id="progressbar">
<div id="progresswidth"></div>
</div>
<p>Please move your mouse, play around and generally introduce entropy into your environment.</p>
</body>
</html>
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