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performance improvements using multiple child processes #20

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merged 1 commit into from
Jan 10, 2023
Merged

performance improvements using multiple child processes #20

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85 changes: 49 additions & 36 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,19 +2,20 @@

"use strict";

const crypto = require('crypto');
const variationsStream = require('variations-stream');
const pkg = require('./package');
const variationsStream = require("variations-stream");
const pkg = require("./package");
const { fork } = require("child_process");

const defaultAlphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
const defaultAlphabet =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
const defaultMaxLength = 12;
const token = process.argv[2];
const alphabet = process.argv[3] || defaultAlphabet;
const maxLength = Number(process.argv[4]) || defaultMaxLength;

if (typeof(token) === 'undefined' || token === '--help') {
if (typeof token === "undefined" || token === "--help") {
console.log(
`jwt-cracker version ${pkg.version}
`jwt-cracker version ${pkg.version}

Usage:
jwt-cracker <token> [<alphabet>] [<maxLength>]
Expand All @@ -23,50 +24,62 @@ if (typeof(token) === 'undefined' || token === '--help') {
alphabet the alphabet to use for the brute force (default: ${defaultAlphabet})
maxLength the max length of the string generated during the brute force (default: ${defaultMaxLength})
`
);
);
process.exit(0);
}

const generateSignature = function(content, secret) {
return (
crypto.createHmac('sha256', secret)
.update(content)
.digest('base64')
.replace(/=/g, '')
.replace(/\+/g, '-')
.replace(/\//g, '_')
);
};

const printResult = function(startTime, attempts, result) {
const printResult = function (startTime, attempts, result) {
if (result) {
console.log('SECRET FOUND:', result);
console.log("SECRET FOUND:", result);
} else {
console.log('SECRET NOT FOUND');
console.log("SECRET NOT FOUND");
}
console.log('Time taken (sec):', ((new Date).getTime() - startTime)/1000);
console.log('Attempts:', attempts);
console.log("Time taken (sec):", (new Date().getTime() - startTime) / 1000);
console.log("Attempts:", attempts);
};

const [header, payload, signature] = token.split('.');
const [header, payload, signature] = token.split(".");
const content = `${header}.${payload}`;

const startTime = new Date().getTime();
let attempts = 0;
const chunkSize = 20000;
let chunk = [];

variationsStream(alphabet, maxLength)
.on('data', function(comb) {
attempts++;
const currentSignature = generateSignature(content, comb);
if (attempts%100000 === 0) {
console.log('Attempts:', attempts);
}
if (currentSignature == signature) {
printResult(startTime, attempts, comb);
process.exit(0);
.on("data", function (comb) {
chunk.push(comb);
if (chunk.length >= chunkSize) {
// save chunk and reset it
forkChunk(chunk);
chunk = [];
}
})
.on('end', function(){
.on("end", function () {
printResult(startTime, attempts);
process.exit(1);
})
;
});

function forkChunk(chunk) {
const child = fork("process-chunk.js");
child.send({ chunk, content, signature });
child.on("message", function (result) {
attempts += chunkSize;
if (result === null && attempts % 100000 === 0) {
console.log("Attempts:", attempts);
}
if (result) {
// secret found, print result and exit
printResult(startTime, attempts, result);
process.exit(0);
}
});
child.on("exit", function () {
// check if all child processes have finished, and if so, exit
checkFinished();
});
}

function checkFinished() {
// check if all child processes have finished, and if so, exit
}
23 changes: 23 additions & 0 deletions process-chunk.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
const crypto = require("crypto");

const generateSignature = function (content, secret) {
return crypto
.createHmac("sha256", secret)
.update(content)
.digest("base64")
.replace(/=/g, "")
.replace(/\+/g, "-")
.replace(/\//g, "_");
};
process.on("message", function ({ chunk, content, signature }) {
console.log("process spawned", chunk.length);
for (let i = 0; i < chunk.length; i++) {
const currentSignature = generateSignature(content, chunk[i]);
if (currentSignature == signature) {
process.send(chunk[i]);
process.exit(0);
}
}
process.send(null);
process.exit(1);
});