Chatto/chatto/src/main/resources/static/js/worker.js

// worker.js
importScripts('https://unpkg.com/promise-worker/dist/promise-worker.register.js');
importScripts('https://cdnjs.cloudflare.com/ajax/libs/sjcl/1.0.8/sjcl.min.js');

registerPromiseWorker((payload) => {
    // console.log(payload)
    // console.log('decrypted = ' + sjcl.decrypt(payload.passphrase, JSON.stringify(payload.cipher)));
    // return 'pong';
    return sjcl.decrypt(payload.passphrase, JSON.stringify(payload.cipher))
});