// Random number generator - requires a PRNG backend, e.g. prng4.js
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import { prng_newstate, rng_psize } from "./prng4";
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var rng_state;
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var rng_pool = null;
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var rng_pptr;
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// Initialize the pool with junk if needed.
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if (rng_pool == null) {
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rng_pool = [];
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rng_pptr = 0;
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var t = void 0;
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if (typeof window !== 'undefined' && window.crypto && window.crypto.getRandomValues) {
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// Extract entropy (2048 bits) from RNG if available
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var z = new Uint32Array(256);
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window.crypto.getRandomValues(z);
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for (t = 0; t < z.length; ++t) {
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rng_pool[rng_pptr++] = z[t] & 255;
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}
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}
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// Use mouse events for entropy, if we do not have enough entropy by the time
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// we need it, entropy will be generated by Math.random.
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var count = 0;
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var onMouseMoveListener_1 = function (ev) {
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count = count || 0;
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if (count >= 256 || rng_pptr >= rng_psize) {
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if (window.removeEventListener) {
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window.removeEventListener("mousemove", onMouseMoveListener_1, false);
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}
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else if (window.detachEvent) {
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window.detachEvent("onmousemove", onMouseMoveListener_1);
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}
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return;
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}
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try {
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var mouseCoordinates = ev.x + ev.y;
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rng_pool[rng_pptr++] = mouseCoordinates & 255;
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count += 1;
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}
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catch (e) {
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// Sometimes Firefox will deny permission to access event properties for some reason. Ignore.
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}
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};
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if (typeof window !== 'undefined') {
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if (window.addEventListener) {
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window.addEventListener("mousemove", onMouseMoveListener_1, false);
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}
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else if (window.attachEvent) {
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window.attachEvent("onmousemove", onMouseMoveListener_1);
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}
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}
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}
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function rng_get_byte() {
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if (rng_state == null) {
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rng_state = prng_newstate();
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// At this point, we may not have collected enough entropy. If not, fall back to Math.random
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while (rng_pptr < rng_psize) {
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var random = Math.floor(65536 * Math.random());
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rng_pool[rng_pptr++] = random & 255;
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}
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rng_state.init(rng_pool);
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for (rng_pptr = 0; rng_pptr < rng_pool.length; ++rng_pptr) {
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rng_pool[rng_pptr] = 0;
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}
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rng_pptr = 0;
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}
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// TODO: allow reseeding after first request
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return rng_state.next();
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}
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var SecureRandom = /** @class */ (function () {
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function SecureRandom() {
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}
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SecureRandom.prototype.nextBytes = function (ba) {
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for (var i = 0; i < ba.length; ++i) {
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ba[i] = rng_get_byte();
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}
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};
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return SecureRandom;
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}());
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export { SecureRandom };
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