in_data/checksum in AP-REQ?

[Chris Hecker]

What's the in_data for on an AP-REQ/mk_req?  It gets checksummed and 
stuffed in the authenticator, but it doesn't seem to be used anywhere 
(although I might be missing something).  The sim_client.c file passes 
the hostname in for the in_data, but sim_server.c ignores 
auth_context->authentp->checksum, which seems to be the only way to get 
to it after a rd_req.

Thanks,
Chris