node-jsbnrsa/lib/rng.js

node rsa module url: http://www-cs-students.stanford.edu/~tjw/jsbn/

var crypt = require('crypto');
/*
var prng_newstate = require('./prng4.js');

var rng_state;
var rng_pool;
var rng_pptr;

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;
}

function rng_seed_time() {
    rng_seed_int(new Date().getTime());
}

if (rng_pool == null) {
    rng_pool = new Array();
    rng_pptr = 0;
    var t;
    if (window.crypto && window.crypto.getRandomValues) {
        var ua = new Uint8Array(32);
        window.crypto.getRandomValues(ua);
        for (t = 0; t < 32; ++t)
            rng_pool[rng_pptr++] = ua[t];
    }
    if (navigator.appName == "Netscape" && navigator.appVersion < "5" && window.crypto) {
        var z = window.crypto.random(32);
        for (t = 0; t < z.length; ++t)
            rng_pool[rng_pptr++] = z.charCodeAt(t) & 255;
    }
    while (rng_pptr < rng_psize) {
        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();
        rng_state = 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;
    }
    return rng_state.next();
}
*/
function rng_get_bytes(ba) {
    var i;
    var buff = crypto.randomBytes(ba.length);
    for (i = 0; i < ba.length; ++i) {
        ba[i] = buff[i];
        //ba[i] = rng_get_byte();
    }
}
function SecureRandom() {
}
SecureRandom.prototype.nextBytes = rng_get_bytes;


//module.exports = SecureRandom;