Perl and Passwords

[Daniel Davidson <danield@life.uiuc.edu>]

I need to write a CGI so that people can modify their passwords, which are 
stored in LDAP over the web.  Currently the passwords are changed by them 
coming to us and us typing in the commands, then letting them type in their 
new passwords (we do not allow shell access).  Does anyone have something to 
do this, I have had difficulty in finding one.  In particular I need to find 
how to encrypt the password so that it matches the one regularly stored in 
/etc/shadow.

thanks,

Daniel Davidson