From the perldoc:
Crypt::PasswdMD5 - Provides interoperable MD5-based crypt() functions
SYNOPSIS
use Crypt::PasswdMD5;
$cryptedpassword = unix_md5_crypt($password, $salt);
$apachepassword = apache_md5_crypt($password, $salt);
DESCRIPTION
the "unix_md5_crypt()" provides a crypt()-compatible interface to the
rather new MD5-based crypt() function found in modern operating sys-
tems. It's based on the implementation found on FreeBSD
2.2.[56]-RELEASE and contains the following license in it:
6bad0fddf2