SecureRandom Class / solvr:bignum Library / Dart Documentation

SecureRandom Class

Constructors

Code new SecureRandom() #

SecureRandom() {
  rng = new Mathx.Random();
  rng_pool_init();
  
}

Methods

Code nextBytes(ba) #

nextBytes(ba) {
  var i;
  for(i = 0; i < ba.length; ++i) ba[i] = rng_get_byte();
}

Code rng_get_byte() #

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();
}

Code rng_pool_init() #

rng_pool_init() {
  // Initialize the pool with junk if needed.
  if(rng_pool == null) {
    rng_pool = new Map();
    rng_pptr = 0;
    var t;
    while(rng_pptr < rng_psize) {  // extract some randomness from Mathx.random()
      //t = (65536 * Mathx.random()).floor();
      t = (65536 * rng.nextDouble()).floor();
      rng_pool[rng_pptr++] = t.toInt() >> 8;
      rng_pool[rng_pptr++] = t.toInt() & 255;
    }
    rng_pptr = 0;
    rng_seed_time();
    //rng_seed_int(window.screenX);
    //rng_seed_int(window.screenY);
  }
}

Code rng_seed_int(x) #

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;
}

Code rng_seed_time() #

rng_seed_time() {
  // Use pre-computed date to avoid making the benchmark
  // results dependent on the current date.
  rng_seed_int(1122926989487);
}

Fields

Code Random rng #

Mathx.Random rng;

Code var rng_pool #

var rng_pool;

Code var rng_pptr #

var rng_pptr;

Code var rng_psize #

var rng_psize = 256;

Code var rng_state #

var rng_state;