samba - Jun 1999 - HP-UX 10.20 Trusted Systems

Hello,
        We are running HP-UX 10.20 trusted systems and Samba 1.9.18p2.  
     Samba is not authenticating the user password from the /etc/passwd 
     file because the passwords are not encrypted in this file.
     
        Does anyone have an idea on how to get around this issue?  One 
     option could be smbpasswd, but the SAs are not happy with this option.
     
     Thanks,
     
     Joe Adams