dav module and client ssl certificates

[Phillip Susi <psusi cfl rr com>]

It seems that the gnome-vfs dav module does not support using client ssl 
certificates to authenticate with the server.  Instead it only supports 
server certificates and basic http name/password authentication.

If this is indeed the case, then I would like to start some discussion 
on implementing support for client certificates.  It seems that what is 
needed is something like they keyring or ssh-agent where gnome-vfs can 
request a certificate from to connect to the server, and the daemon 
would prompt the user for their certificate password to decrypt it if 
this has not been done recently, then supply it to gnome-vfs.

Is this existing keyring service capable of handling a x.509 certificate 
instead of name/password plain text pairs?  If so, then would it be 
somewhat easy to patch gnome-vfs to ask it for a client certificate and 
pass it to neon ( it does use neon right? )?