hasher-kawpow

This is a Node module for simple hashing and verifying inputs using the KawPOW proof-of-work algorithm as implemented by Ravencoin. Most of the native code comes from or is adapted from Ravencoin code.

This module has been developed and tested on Node v10.16.3 and Ubuntu 16.04 for the Ravencoin mining pool at MintPond.

Install

Install as Dependency in NodeJS Project

# Install from Github git package

sudo apt-get install build-essential
npm install mintpond/hasher-kawpow --save

-or-

# Install from Github NPM repository

sudo apt-get install build-essential
npm config set @mintpond:registry https://npm.pkg.github.com/mintpond
npm config set //npm.pkg.github.com/:_authToken <MY_GITHUB_AUTH_TOKEN>

npm install @mintpond/hasher-kawpow@1.0.0 --save

Install & Test

# Install nodejs v10
curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
sudo apt-get install nodejs -y

# Download hasher-kawpow
git clone https://github.com/MintPond/hasher-kawpow

# build
cd hasher-kawpow
sudo apt-get install build-essential
npm install

# test
npm test

Usage

Hash

const kawpow = require('@mintpond/hasher-kawpow');

const mixOutBuf = Buffer.alloc(32);
const hashOutBuf = Buffer.alloc(32);

/**
 * Hash using a single nonce and place results into the specified output Buffers.
 *
 * Note that all input values are expected to be in little-endian format.
 *
 * All output values are in little endian format
 *
 * @param headerHashBuf {Buffer} 32-byte header hash
 * @param nonceBuf {Buffer} 8-byte nonce value (64-bits)
 * @param blockHeight {number} Block height integer
 * @param mixOutBuf {Buffer} Mix hash result output Buffer
 * @param hashOutBuf {Buffer} Hash result output Buffer
 */
kawpow.hashOne(headerHashBuf, nonceBuf, blockHeight, mixOutBuf, hashOutBuf);

console.log(mixHashBuf.toString('hex'));
console.log(hashOutBuf.toString('hex'));

Verify

const kawpow = require('@mintpond/hasher-kawpow');

const hashValueOut = Buffer.alloc(32);

/**
 * Verify a mix hash.
 *
 * Note that all input values are expected to be in little-endian format.
 *
 * All output values are in little endian format.
 *
 * @param headerHashBuf {Buffer} 32-byte header hash
 * @param nonceBuf {Buffer} 8-byte nonce value (64-bits)
 * @param blockHeight {number} Block height integer
 * @param mixHashBuf {Buffer} Mix hash for verification
 * @param hashOutBuf {Buffer} Hash result output Buffer
 * @returns {boolean} True if valid, otherwise false.
 */
const isValid = kawpow.verify(headerHashBuf, nonceBuf, blockHeight, mixHashBuf, hashValueOut);

if (isValid) {
    console.log(hashValueOut.toString('hex'));
}
else {
    console.log('Invalid');
}

Dependencies

In Ubuntu:

   sudo apt-get install build-essential