| 1 | /* basic entropy accumulator */
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| 2 | var accum = (function() {
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| 3 |
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| 4 | var pool, // randomness pool
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| 5 | time, // start timestamp
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| 6 | last; // last step timestamp
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| 7 |
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| 8 | /* initialize with default pool */
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| 9 | function init() {
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| 10 | pool = [];
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| 11 | time = new Date().getTime();
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| 12 | last = time;
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| 13 | // use Math.random
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| 14 | pool.push((Math.random() * 0xffffffff)|0);
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| 15 | // use current time
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| 16 | pool.push(time|0);
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| 17 | }
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| 18 |
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| 19 | /* perform one step */
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| 20 | function step() {
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| 21 | if (!to)
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| 22 | return;
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| 23 | if (pool.length >= 255) { // stop at 255 values (1 more is added on fetch)
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| 24 | stop();
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| 25 | return;
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| 26 | }
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| 27 | var now = new Date().getTime();
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| 28 | // use actual time difference
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| 29 | pool.push(now-last);
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| 30 | // always compute, occasionally use Math.random
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| 31 | var rnd = (Math.random() * 0xffffffff)|0;
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| 32 | if (now % 2)
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| 33 | pool[pool.length-1] += rnd;
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| 34 | last = now;
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| 35 | to = setTimeout(step, 100+Math.random()*512); // use hypothetical time difference
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| 36 | }
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| 37 |
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| 38 | var to = null;
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| 39 |
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| 40 | /* starts accumulating */
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| 41 | function start() {
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| 42 | if (to) return;
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| 43 | to = setTimeout(step, 100+Math.random()*512);
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| 44 | if (console.log)
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| 45 | console.log("bcrypt-isaac: collecting entropy...");
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| 46 | // install collectors
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| 47 | if (typeof window !== 'undefined' && window && window.addEventListener)
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| 48 | window.addEventListener("load", loadCollector, false),
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| 49 | window.addEventListener("mousemove", mouseCollector, false),
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| 50 | window.addEventListener("touchmove", touchCollector, false);
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| 51 | else if (typeof document !== 'undefined' && document && document.attachEvent)
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| 52 | document.attachEvent("onload", loadCollector),
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| 53 | document.attachEvent("onmousemove", mouseCollector);
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| 54 | }
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| 55 |
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| 56 | /* stops accumulating */
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| 57 | function stop() {
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| 58 | if (!to) return;
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| 59 | clearTimeout(to); to = null;
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| 60 | // uninstall collectors
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| 61 | if (typeof window !== 'undefined' && window && window.removeEventListener)
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| 62 | window.removeEventListener("load", loadCollector, false),
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| 63 | window.removeEventListener("mousemove", mouseCollector, false),
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| 64 | window.removeEventListener("touchmove", touchCollector, false);
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| 65 | else if (typeof document !== 'undefined' && document && document.detachEvent)
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| 66 | document.detachEvent("onload", loadCollector),
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| 67 | document.detachEvent("onmousemove", mouseCollector);
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| 68 | }
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| 69 |
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| 70 | /* fetches the randomness pool */
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| 71 | function fetch() {
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| 72 | // add overall time difference
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| 73 | pool.push((new Date().getTime()-time)|0);
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| 74 | var res = pool;
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| 75 | init();
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| 76 | if (console.log)
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| 77 | console.log("bcrypt-isaac: using "+res.length+"/256 samples of entropy");
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| 78 | // console.log(res);
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| 79 | return res;
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| 80 | }
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| 81 |
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| 82 | /* adds the current time to the top of the pool */
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| 83 | function addTime() {
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| 84 | pool[pool.length-1] += new Date().getTime() - time;
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| 85 | }
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| 86 |
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| 87 | /* page load collector */
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| 88 | function loadCollector() {
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| 89 | if (!to || pool.length >= 255)
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| 90 | return;
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| 91 | pool.push(0);
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| 92 | addTime();
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| 93 | }
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| 94 |
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| 95 | /* mouse events collector */
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| 96 | function mouseCollector(ev) {
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| 97 | if (!to || pool.length >= 255)
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| 98 | return;
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| 99 | try {
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| 100 | var x = ev.x || ev.clientX || ev.offsetX || 0,
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| 101 | y = ev.y || ev.clientY || ev.offsetY || 0;
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| 102 | if (x != 0 || y != 0)
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| 103 | pool[pool.length-1] += ((x-mouseCollector.last[0]) ^ (y-mouseCollector.last[1])),
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| 104 | addTime(),
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| 105 | mouseCollector.last = [x,y];
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| 106 | } catch (e) {}
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| 107 | }
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| 108 | mouseCollector.last = [0,0];
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| 109 |
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| 110 | /* touch events collector */
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| 111 | function touchCollector(ev) {
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| 112 | if (!to || pool.length >= 255)
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| 113 | return;
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| 114 | try {
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| 115 | var touch = ev.touches[0] || ev.changedTouches[0];
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| 116 | var x = touch.pageX || touch.clientX || 0,
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| 117 | y = touch.pageY || touch.clientY || 0;
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| 118 | if (x != 0 || y != 0)
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| 119 | pool[pool.length-1] += (x-touchCollector.last[0]) ^ (y-touchCollector.last[1]),
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| 120 | addTime(),
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| 121 | touchCollector.last = [x,y];
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| 122 | } catch (e) {}
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| 123 | }
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| 124 | touchCollector.last = [0,0];
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| 125 |
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| 126 | init();
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| 127 | return {
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| 128 | "start": start,
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| 129 | "stop": stop,
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| 130 | "fetch": fetch
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| 131 | }
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| 132 |
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| 133 | })();
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