[jcifs] Obtaining username to/from NT SID

[eglass1 at attbi.com]

I'm currently working on a project where I have the need 
to match a user's NT SID to their username.  Previously, 
I was using a native call to LookupAccountSid with the 
SID to retrieve the username.  However, I was wondering 
if it would be possible via jCIFS to either do this or 
go the other way -- i.e., the user has authenticated via 
NTLM, and I want to retrieve the SID (using perhaps the 
NtlmPasswordAuthentication object?).  I essentially have 
2 sources (one with the SID and one with a username), 
and I need to match them.  Anyone have any ideas?  
Ideally, I would like to do this in pure Java (I can 
already do it natively, but that ties me to a specific 
platform).

Eric