I haven'be been able to debug why this is happening.
For my PHP 8.3, Ubuntu 20 box.
I've got the latest composer on it and the latest phpseclib3.
I connect to the server, I try to login based on examples and I get:
pkcs8 is not a supported format
Why is it trying pkcs8 when I'm trying to use username/password?
I don't know how to get at debugging this or if I'm missing some additional package that I need.