A simple program to compute arguments for contract TxAdvanced

txAdvancedArgs.js

/*
 * a simple program to compute arguments for contract TxAdvanced
 */
const bsv = require('bsv')
const BN = bsv.crypto.BN
const pt = bsv.crypto.Point

const G = pt.getG()
const N = pt.getN()

const privateKey = bsv.PrivateKey.fromRandom('testnet')
console.log('privateKey: ' + privateKey.toHex())
const publicKey = bsv.PublicKey.fromPrivateKey(privateKey)
console.log('publicKey: ' + publicKey.toHex())

const kBuf = bsv.crypto.Random.getRandomBuffer(32)
const k = new BN(kBuf, 'hex')
console.log('k: ' + k.toString('hex'))
const invk = k.invm(N)
console.log('invk: ' + invk.toString('hex'))
const K = G.mul(k)
const r = K.getX()
console.log('r: ' + r.toString('hex'))
console.log('rBigEndian: ' + r.toSM({ endian: 'big'} ).toString('hex'))