@proton/ccxt
Version:
A JavaScript / TypeScript / Python / C# / PHP cryptocurrency trading library with support for 130+ exchanges
51 lines (48 loc) • 1.51 kB
JavaScript
// ----------------------------------------------------------------------------
// PLEASE DO NOT EDIT THIS FILE, IT IS GENERATED AND WILL BE OVERWRITTEN:
// https://github.com/ccxt/ccxt/blob/master/CONTRIBUTING.md#how-to-contribute-code
// EDIT THE CORRESPONDENT .ts FILE INSTEAD
// prng4.js - uses Arcfour as a PRNG
export class Arcfour {
constructor() {
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]
init(key) {
let i;
let j;
let 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;
next() {
let 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];
}
}
// 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 let rng_psize = 256;