version 2.001; 2006-08-30

  * add vms_username() and vms_password() functions for syntax checking
    and canonicalisation

version 2.0; 2006-08-27

  * rewrite by Zefram: based on a newer branch of Shawn Clifford's C
    code; proper Perlish error handling; allow arbitrary byte strings
    (including embedded NULs); new documentation; many test vectors

version 1.0; 2003-09-11

  * original version by <mikem@open.com.au>