Revision eaf80a57fa0feab78713bf35904b402b86266c84 authored by Navid Zolghadr on 20 March 2018, 17:08:44 UTC, committed by Navid Zolghadr on 20 March 2018, 17:08:44 UTC
1 parent 6e1b5f4
timing-attack.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>window.performance.now should not enable timing attacks</title>
<link rel="author" title="W3C" href="http://www.w3.org/" />
<link rel="help" href="http://w3c.github.io/hr-time/#privacy-security"/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
function check_resolutions(times, length) {
var end = length - 2;
// we compare each value with the following ones
for (var i = 0; i < end; i++) {
var h1 = times[i];
for (var j = i+1; j < end; j++) {
var h2 = times[j];
var diff = h2 - h1;
assert_true((diff === 0) || ((diff * 1000) >= 5),
"Differences smaller than 5 microseconds: " + diff);
}
}
return true;
}
var times = new Array(10);
var index = 0;
var hrt1, hrt2, hrt;
// rapid firing of performance.now
hrt1 = performance.now();
hrt2 = performance.now();
times[index++] = hrt1;
times[index++] = hrt2;
// ensure that we get performance.now() to return a different value
do {
hrt = performance.now();
times[index++] = hrt;
} while ((hrt - hrt1) === 0);
assert_true(check_resolutions(times, index), 'Difference should be at least 5 microseconds.');
}, 'The recommended minimum resolution of the Performance interface has been set to 5 microseconds');
</script>
</head>
<body>
<h1>Description</h1>
<p>The recommended minimum resolution of the Performance interface should be set to 5 microseconds.</p>
<div id="log"></div>
</body>
</html>
![swh spinner](/static/img/swh-spinner.gif)
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