The `unix_md5_crypt()' provides a crypt()-compatible interface
to the rather new MD5-based crypt() function found in modern
operating systems. It's based on the implementation found on
FreeBSD 2.2.[56]-RELEASE.

`apache_md5_crypt()' provides a function compatible with
Apache's `.htpasswd' files.

This was contributed by Bryan Hart <bryan@eai.com>.
