react-native-hashcash

Expo-compatible C++ turbo module for the new architecture which implements SHA-256 based Hashcash algorithm against brute-force

(See react-native-hashcash-old for the version for the old architecture)

Installation

npm i github:tolgaatam/react-native-hashcash#v0.1.0

Usage

Import async function calculateHashcash and execute it with k (difficulty multiplier) and resource identifier

import { calculateHashcash } from 'react-native-hashcash-old'

const result = await calculateHashcash(19, "tolgaatam")

console.log(result) // 1:19:230505:tolgaatam::dwhWzS19EA2rnOes:157149

k must be an integer and the resource identifier must be a string.

With the current situation of smartphone chips, k=19 is the highest comfortable difficult multiplier to choose.

It is advisable to not allow colons in the resource identifier. It could make parsing the resulting hashcash string difficult. URL-encoding the resource identifier would be even safer.

Ceveats

Only the most recent Hashcash version 1 is supported.
Date format only supports yyMMdd.
Salt size is not configurable (16 chars fixed).

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

License

MIT

Made with create-react-native-library

Uses stbrumme's C++ hashing library for calculating SHA256 hashes