madeline-ton
Version:
Pure JS client-side implementation of the Telegram TON blockchain protocol
102 lines (79 loc) • 2.68 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.rng_get_byte = rng_get_byte;
exports.rng_get_bytes = rng_get_bytes;
exports.rng_seed_int = rng_seed_int;
exports.rng_seed_time = rng_seed_time;
exports.rng_state = exports.rng_pool = void 0;
var _prng = require("./prng4");
var _poly = require("../crypto-sync/poly");
// Random number generator - requires a PRNG backend, e.g. prng4.js
// For best results, put code like
// <body onClick='rng_seed_time();' onKeyPress='rng_seed_time();'>
// in your main HTML document.
// Pool size must be a multiple of 4 and greater than 32.
// An array of bytes the size of the pool will be passed to init()
var rng_psize = 256;
var rng_state;
exports.rng_state = rng_state;
var rng_pool;
exports.rng_pool = rng_pool;
var rng_pptr; // Mix in a 32-bit integer into the pool
function rng_seed_int(x) {
rng_pool[rng_pptr++] ^= x & 255;
rng_pool[rng_pptr++] ^= x >> 8 & 255;
rng_pool[rng_pptr++] ^= x >> 16 & 255;
rng_pool[rng_pptr++] ^= x >> 24 & 255;
if (rng_pptr >= rng_psize) rng_pptr -= rng_psize;
} // Mix in the current time (w/milliseconds) into the pool
function rng_seed_time() {
rng_seed_int(new Date().getTime());
} // Initialize the pool with junk if needed.
if (rng_pool == null) {
exports.rng_pool = rng_pool = new Array();
rng_pptr = 0;
var t;
if (_poly.windowObject.crypto && _poly.windowObject.crypto.getRandomValues) {
// Use webcrypto if available
var ua = new Uint8Array(32);
_poly.windowObject.crypto.getRandomValues(ua);
for (t = 0; t < 32; ++t) {
rng_pool[rng_pptr++] = ua[t];
}
}
if (navigator.appName == "Netscape" && navigator.appVersion < "5" && _poly.windowObject.crypto) {
// Extract entropy (256 bits) from NS4 RNG if available
var z = _poly.windowObject.crypto.random(32);
for (t = 0; t < z.length; ++t) {
rng_pool[rng_pptr++] = z.charCodeAt(t) & 255;
}
}
while (rng_pptr < rng_psize) {
// extract some randomness from Math.random()
t = Math.floor(65536 * Math.random());
rng_pool[rng_pptr++] = t >>> 8;
rng_pool[rng_pptr++] = t & 255;
}
rng_pptr = 0;
rng_seed_time();
}
function rng_get_byte() {
if (rng_state == null) {
rng_seed_time();
exports.rng_state = rng_state = (0, _prng.prng_newstate)();
rng_state.init(rng_pool);
for (rng_pptr = 0; rng_pptr < rng_pool.length; ++rng_pptr) {
rng_pool[rng_pptr] = 0;
}
rng_pptr = 0; //rng_pool = null;
} // TODO: allow reseeding after first request
return rng_state.next();
}
function rng_get_bytes(ba) {
var i;
for (i = 0; i < ba.length; ++i) {
ba[i] = rng_get_byte();
}
}