/**
 * An API for getting cryptographically-secure random bytes. The bytes are
 * generated using the Fortuna algorithm devised by Bruce Schneier and
 * Niels Ferguson.
 *
 * Getting strong random bytes is not yet easy to do in javascript. The only
 * truish random entropy that can be collected is from the mouse, keyboard, or
 * from timing with respect to page loads, etc. This generator makes a poor
 * attempt at providing random bytes when those sources haven't yet provided
 * enough entropy to initially seed or to reseed the PRNG.
 *
 * @author Dave Longley
 *
 * Copyright (c) 2009-2014 Digital Bazaar, Inc.
 */
var forge = require('./forge');
require('./aes');
require('./sha256');
require('./prng');
require('./util');

(function() {

// forge.random already defined
if(forge.random && forge.random.getBytes) {
  module.exports = forge.random;
  return;
}

(function(jQuery) {

// the default prng plugin, uses AES-128
var prng_aes = {};
var _prng_aes_output = new Array(4);
var _prng_aes_buffer = forge.util.createBuffer();
prng_aes.formatKey = function(key) {
  // convert the key into 32-bit integers
  var tmp = forge.util.createBuffer(key);
  key = new Array(4);
  key[0] = tmp.getInt32();
  key[1] = tmp.getInt32();
  key[2] = tmp.getInt32();
  key[3] = tmp.getInt32();

  // return the expanded key
  return forge.aes._expandKey(key, false);
};
prng_aes.formatSeed = function(seed) {
  // convert seed into 32-bit integers
  var tmp = forge.util.createBuffer(seed);
  seed = new Array(4);
  seed[0] = tmp.getInt32();
  seed[1] = tmp.getInt32();
  seed[2] = tmp.getInt32();
  seed[3] = tmp.getInt32();
  return seed;
};
prng_aes.cipher = function(key, seed) {
  forge.aes._updateBlock(key, seed, _prng_aes_output, false);
  _prng_aes_buffer.putInt32(_prng_aes_output[0]);
  _prng_aes_buffer.putInt32(_prng_aes_output[1]);
  _prng_aes_buffer.putInt32(_prng_aes_output[2]);
  _prng_aes_buffer.putInt32(_prng_aes_output[3]);
  return _prng_aes_buffer.getBytes();
};
prng_aes.increment = function(seed) {
  // FIXME: do we care about carry or signed issues?
  ++seed[3];
  return seed;
};
prng_aes.md = forge.md.sha256;

/**
 * Creates a new PRNG.
 */
function spawnPrng() {
  var ctx = forge.prng.create(prng_aes);

  /**
   * Gets random bytes. If a native secure crypto API is unavailable, this
   * method tries to make the bytes more unpredictable by drawing from data that
   * can be collected from the user of the browser, eg: mouse movement.
   *
   * If a callback is given, this method will be called asynchronously.
   *
   * @param count the number of random bytes to get.
   * @param [callback(err, bytes)] called once the operation completes.
   *
   * @return the random bytes in a string.
   */
  ctx.getBytes = function(count, callback) {
    return ctx.generate(count, callback);
  };

  /**
   * Gets random bytes asynchronously. If a native secure crypto API is
   * unavailable, this method tries to make the bytes more unpredictable by
   * drawing from data that can be collected from the user of the browser,
   * eg: mouse movement.
   *
   * @param count the number of random bytes to get.
   *
   * @return the random bytes in a string.
   */
  ctx.getBytesSync = function(count) {
    return ctx.generate(count);
  };

  return ctx;
}

// create default prng context
var _ctx = spawnPrng();

// add other sources of entropy only if window.crypto.getRandomValues is not
// available -- otherwise this source will be automatically used by the prng
var getRandomValues = null;
var globalScope = forge.util.globalScope;
var _crypto = globalScope.crypto || globalScope.msCrypto;
if(_crypto && _crypto.getRandomValues) {
  getRandomValues = function(arr) {
    return _crypto.getRandomValues(arr);
  };
}

if(forge.options.usePureJavaScript ||
  (!forge.util.isNodejs && !getRandomValues)) {
  // if this is a web worker, do not use weak entropy, instead register to
  // receive strong entropy asynchronously from the main thread
  if(typeof window === 'undefined' || window.document === undefined) {
    // FIXME:
  }

  // get load time entropy
  _ctx.collectInt(+new Date(), 32);

  // add some entropy from navigator object
  if(typeof(navigator) !== 'undefined') {
    var _navBytes = '';
    for(var key in navigator) {
      try {
        if(typeof(navigator[key]) == 'string') {
          _navBytes += navigator[key];
        }
      } catch(e) {
        /* Some navigator keys might not be accessible, e.g. the geolocation
          attribute throws an exception if touched in Mozilla chrome://
          context.

          Silently ignore this and just don't use this as a source of
          entropy. */
      }
    }
    _ctx.collect(_navBytes);
    _navBytes = null;
  }

  // add mouse and keyboard collectors if jquery is available
  if(jQuery) {
    // set up mouse entropy capture
    jQuery().mousemove(function(e) {
      // add mouse coords
      _ctx.collectInt(e.clientX, 16);
      _ctx.collectInt(e.clientY, 16);
    });

    // set up keyboard entropy capture
    jQuery().keypress(function(e) {
      _ctx.collectInt(e.charCode, 8);
    });
  }
}

/* Random API */
if(!forge.random) {
  forge.random = _ctx;
} else {
  // extend forge.random with _ctx
  for(var key in _ctx) {
    forge.random[key] = _ctx[key];
  }
}

// expose spawn PRNG
forge.random.createInstance = spawnPrng;

module.exports = forge.random;

})(typeof(jQuery) !== 'undefined' ? jQuery : null);

})();
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