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Clustered bruteforce password-cracking example
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| const cluster = require('cluster'); | |
| const numCPUs = require('os').cpus().length - 1; | |
| const {promisify} = require('util'); | |
| const pbkdf2 = promisify(require('crypto').pbkdf2); | |
| if (cluster.isMaster) { | |
| const workers = []; | |
| console.log(`Starting ${numCPUs} workers…`) | |
| for (let i = 0; i < numCPUs; i += 1) { | |
| workers.push(cluster.fork()); | |
| } | |
| (async function bruteforce() { | |
| const theSecret = (await pbkdf2('500', 'salt', 1e5, 32, 'sha512')).toString('hex'); | |
| let sample = 0; | |
| console.time('bruteforce'); | |
| workers.forEach(worker => { | |
| worker.send(sample++); | |
| worker.on('message', ({secret, hash}) => { | |
| if (theSecret != hash) return worker.send(sample++); | |
| console.timeEnd('bruteforce'); | |
| console.log(`Your secret is ${secret}`); | |
| workers.forEach(worker => worker.kill()); | |
| }); | |
| }); | |
| })(); | |
| return; | |
| } | |
| // Worker Code | |
| process.on('message', (sample) => { | |
| (async () => { | |
| console.log(`computing "${sample}"…`); | |
| const hash = (await pbkdf2(String(sample), 'salt', 1e5, 32, 'sha512')).toString('hex'); | |
| if (process.connected) process.send({secret: sample, hash}); | |
| })(); | |
| }); |
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