103 lines
3.3 KiB
JavaScript
103 lines
3.3 KiB
JavaScript
// Downloaded from http://www-cs-students.stanford.edu/~tjw/jsbn/ by Jeremy White on 6/1/2012
|
|
|
|
/*
|
|
* Copyright (c) 2003-2005 Tom Wu
|
|
* All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
|
|
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
* IN NO EVENT SHALL TOM WU BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
|
|
* INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER
|
|
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF
|
|
* THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT
|
|
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* In addition, the following condition applies:
|
|
*
|
|
* All redistributions must retain an intact copy of this copyright notice
|
|
* and disclaimer.
|
|
*/
|
|
|
|
|
|
// 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;
|