+++ /dev/null
-// 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.
-
-var rng_state;
-var 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) {
- rng_pool = new Array();
- rng_pptr = 0;
- var t;
- if(navigator.appName == "Netscape" && navigator.appVersion < "5" && window.crypto) {
- // Extract entropy (256 bits) from NS4 RNG if available
- 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) { // 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();
- //rng_seed_int(window.screenX);
- //rng_seed_int(window.screenY);
-}
-
-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;
- //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();
-}
-
-function SecureRandom() {}
-
-SecureRandom.prototype.nextBytes = rng_get_bytes;
projects / atutor.git / blobdiff