Docs on string-to-key routines?

[Henry B. Hotz]

Where is the "real" description of the string-to-key functions, V4, 
AFS, and V5?

My specific question is whether any of them have hard upper bounds on 
password length.  Saw a reference that seemed to imply they were 
encryption type specific, but I can't find it again (and that doesn't 
seem quite right in any case).
-- 
The opinions expressed in this message are mine,
not those of Caltech, JPL, NASA, or the US Government.
Henry.B.Hotz at jpl.nasa.gov, or hbhotz at oxy.edu