// prng4.js - uses Arcfour as a PRNG
|
var Arcfour = /** @class */ (function () {
|
function Arcfour() {
|
this.i = 0;
|
this.j = 0;
|
this.S = [];
|
}
|
// Arcfour.prototype.init = ARC4init;
|
// Initialize arcfour context from key, an array of ints, each from [0..255]
|
Arcfour.prototype.init = function (key) {
|
var i;
|
var j;
|
var t;
|
for (i = 0; i < 256; ++i) {
|
this.S[i] = i;
|
}
|
j = 0;
|
for (i = 0; i < 256; ++i) {
|
j = (j + this.S[i] + key[i % key.length]) & 255;
|
t = this.S[i];
|
this.S[i] = this.S[j];
|
this.S[j] = t;
|
}
|
this.i = 0;
|
this.j = 0;
|
};
|
// Arcfour.prototype.next = ARC4next;
|
Arcfour.prototype.next = function () {
|
var t;
|
this.i = (this.i + 1) & 255;
|
this.j = (this.j + this.S[this.i]) & 255;
|
t = this.S[this.i];
|
this.S[this.i] = this.S[this.j];
|
this.S[this.j] = t;
|
return this.S[(t + this.S[this.i]) & 255];
|
};
|
return Arcfour;
|
}());
|
export { Arcfour };
|
// Plug in your RNG constructor here
|
export function prng_newstate() {
|
return new Arcfour();
|
}
|
// Pool size must be a multiple of 4 and greater than 32.
|
// An array of bytes the size of the pool will be passed to init()
|
export var rng_psize = 256;
|
