RADIUS and AFS kerberos

[Aydin Edguer]

I am trying to get Merit RADIUS to work with AFS Kerberos.  The RADIUS
distribution includes a file named afs_stringtokey.c which includes an
empty function afs_passwd_to_key().  The file has a comment:

  /* Replace this file with the real file from the licensed source. */

How can I get a copy of just this file/function?  Is it publicly available?
If not, who should I contact about it?  Do I need to purchase an AFS source
license?

Thanks.