ZeroMQ curve-based security in Node js

Question

I am trying to connect my web app (Node js) to a zmq backend which is written in python and using zmq curve encryption. But I am unable to find any helpful example or another resource about curve encryption in Node js. I tried this code :

      const zmq = require("zeromq");

      async function run(){
          const sock = new zmq.Request;
          sock.curve_publickey =  'wka2b<1234]+x64D%/a?+l0QS*3XRfhn$i!}3lM}'  // Not the original keys. ;-)
          sock.curve_secretkey =  '?frhwU4mFY1g168tXp64(N6sr/nn{=pQdYP**Ej*'
          sock.curve_serverkey =  '4:U}SW6z?:!]uE44]46.TRGV^4z55+(TTX$}C(DC'
          
          sock.connect("tcp://localhost:9090")
          console.log("Connected to Server")
          
          await sock.send(`Request=GenerateModels|UserId=${user}|FileName=${req.params.name}`)
          const [result] = await sock.receive()
          console.log(result.toString('utf8'))
      }
      
      run()

But it doesn't connect to the server. I think I am missing the correct syntax for this. Any help or link to the documentation (searched but no luck) to curve security in zmq (Node js) would be really helpful.

Answer 1

Server:

s.setsockopt(zmq.ZMQ_CURVE_SERVER, 1);
s.setsockopt(zmq.ZMQ_CURVE_SECRETKEY, new Buffer.from("]W{YFJ^->}wG7*m-o/z8L$yWw}<R%c*]EcU.xDQV"));
s.setsockopt(zmq.ZMQ_CURVE_PUBLICKEY, new Buffer.from("rHLUXzqQG$ex{KD/7B#GcT%)f}Li&wo^Ctd*+?Ir"));

Client:

ckeys = zmq.zmqCurveKeypair();
c.setsockopt(zmq.ZMQ_CURVE_SERVER, 0);
c.setsockopt(zmq.ZMQ_CURVE_SECRETKEY, new Buffer.from(ckeys.secret));
c.setsockopt(zmq.ZMQ_CURVE_PUBLICKEY, new Buffer.from(ckeys.public));
c.setsockopt(zmq.ZMQ_CURVE_SERVERKEY, new Buffer.from("rHLUXzqQG$ex{KD/7B#GcT%)f}Li&wo^Ctd*+?Ir"));

Answer 2

Here's how you do it with the latest version 6.x.x.

var zmq = require('zeromq');

const serverKeypair = zmq.curveKeyPair();
const clientKeypair = zmq.curveKeyPair();

// SERVER
(async () => {

    const sock = new zmq.Publisher({
        linger: 0,
        curveServer: true,
        curvePublicKey: serverKeypair.publicKey,
        curveSecretKey: serverKeypair.secretKey,
    });

    await sock.bind("tcp://127.0.0.1:3000");
    ...

})();

// CLIENT
(async () => {

    const sock = new zmq.Subscriber({
        linger: 0,
        curveServerKey: serverKeypair.publicKey,
        curvePublicKey: clientKeypair.publicKey,
        curveSecretKey: clientKeypair.secretKey,
    });

    sock.connect("tcp://127.0.0.1:3000")
    ...

})();