findkey

#!/usr/bin/env node

'use strict';

const fs = require('fs');
const ed = require('@noble/ed25519');
const {
  pubKeyIsValid,
  keyPairFilename,
  keyIsUnderDifficultyThreshold
} = require('./common');

async function findMatchingKey (strict, rounds = 0, matchedResolver) {
  const next = findMatchingKey.bind(null, strict, rounds + 1);

  if (rounds === 0) {
    return new Promise((resolve) => next(resolve));
  }

  const privateKey = ed.utils.randomPrivateKey();
  const publicKey = Buffer.from(await ed.getPublicKey(privateKey));

  if (pubKeyIsValid(publicKey, strict) && keyIsUnderDifficultyThreshold(publicKey, {})) {
    return matchedResolver({ rounds, matched: { privateKey, publicKey } });
  }

  setTimeout(next.bind(null, matchedResolver), 0);
}

async function main () {
  const start = Date.now();
  ['SIGINT', 'SIGHUP'].forEach(sig => process.on(sig, () => process.exit()));

  const { rounds, matched } = await findMatchingKey(process.argv.length > 2 && process.argv[2] === '--strict');
  const outLines = Object.entries(matched).map(([, keyData]) => Buffer.from(keyData).toString('hex'));
  const outStr = outLines.join('');
  const outFileName = keyPairFilename(matched.publicKey);

  await fs.promises.writeFile(outFileName, outStr);
  console.log(`${rounds} in ${(Date.now() - start) / 1000}s.\nWrote: ${outFileName}`);
}

main();