No obvious way to set or use `NetMQCertificate` / cryptography.

[koddan2]

E.g. https://github.com/zeromq/netmq/blob/master/src/NetMQ.Tests/CurveTests.cs

Excerpt from test:

var serverPair = new NetMQCertificate();
using var server = new DealerSocket();
server.Options.CurveServer = true;
server.Options.CurveCertificate = serverPair;
server.Bind($"tcp://127.0.0.1:55367");

var clientPair = new NetMQCertificate();
using var client = new DealerSocket();
client.Options.CurveServerKey = serverPair.PublicKey;
client.Options.CurveCertificate = clientPair;
client.Connect("tcp://127.0.0.1:55367");