Apace C Code Modification

As it works now once a user is logged into htaccess, if apache receives new credentials, it validates them, but does not log the new user in. I need an apache modification to log in a new user to htaccess if the new creditials are different than the old ones. I will provide the mod_auth_digest.c module to test with as well as all of the html and javascript ajax. You would need to create a simple database to support the htacess digest. Upon completion, I will need to know the exact modifications made to the c code.