In case some other lost person stumbles upon this question...
It's a lot of wizardry to me but here's how I got it to work.
1. Generate a public key from private key with:
ssh-keygen -f ~/.ssh/myserver.com-rsa -y -P old_passphrase -N
new_passphrase > ~/.ssh/myserver.com-rsa.pub
2. Put the public key in authorized_keys
cat ~/.ssh/myserver.com-rsa.pub >> ~/.ssh/authorized_keys
Now when getPublicKey is called, it calls getPrivateKey and all is well. You
can retrieve the passphrase however you want but I made an SSHAuthOptions class
to hold the keyfile and passphrase. Look at
https://github.com/twisted/twisted/blob/twisted-17.5.0/src/twisted/conch/client/default.py
and copy relevant parts from getPrivateKey and substitute your passphrase.
Take this for what you paid for it. I don't know much abut SSH2 and don't have
the interest to learn so my methods may be called into question.
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