hbprng

Hash-Based Pseudo-Random Number Generator

A deterministic number generator based on cryptographic hashing algorithms, with TypeScript typings.

Installation

$ npm install hbprng

Usage

import { Hbprng } from 'hbprng';

let generator = new Hbprng(Buffer.from('seed', 'utf8'), 'sha512');

console.log(generator.nextInt());
console.log(generator.nextInt());
console.log(generator.nextInt());

// Output:
// 3242175261
// 539230564
// 526738857

Hbprng Class API

constructor(seed: Buffer, [hashAlg: string = 'sha256'])

• seed: a Buffer used to initialise the number generator
• hashAlg: a string representing the hashing algorithm used to derive the sequence. Defaults to sha256. Please see the Node Crypto Docs for more information on available hashing algorithms.

Given the same seed and hashAlg, the generator will produce the same sequence.

nextByte(): number

Returns the next byte from the sequence.

nextInt(): number

Returns the next 32-bit unsigned integer from the sequence. Note that this method moves 4 bytes along the sequence.