LDAP-Authentication based on CHAP

Hello, despite the FAQ- Entry "How do I make CHAP work with LDAP?": can anybody tell us if its basically possible to run a chap-Auth against an LDAP? I know, that a specific LDAP-Service must be able to retrieve a user-Pwd and often it cant, cause of the storage of the pwd as "one-directioned (hashed)". So, only a "simple bind" is ok. But if LDAP can run a chap-based password-check by retrieving a password: is the LDAP-Protocol (v3) basically capable of doing this? Hamburg/Germany, Rainer Brinkmann