Checking identity and team ID of process' code signature in a kext

In order to add more security to certain functionality in a kext, given a proc_t*, I would like to verify certain aspects of the code signature on a process, such as identity or Team ID. Unfortunately, the csproc_* and csblob_* functions declared in bsd/sys/codesign.h, which seem to exist for exactly that purpose, are private. Is there an Apple-supported way to check code signature information on processes for certain criteria from within a kext?