Copy username + password

Hello!

Im trying to set up a FTP-server using PunBB-tables with userinformation needed for login. The problem is that PunBB uses SHA1 to encrypt the passwords and pure-ftpd can only read crypt(), md5() and plaintext.
Is there any ftp-server that can read sha1 maybe?

I assume that its not att problem to change punbb to save the passwords in md5 but i have read somewere that Rikard will remove md5 (and that sha1 is more secure then md5) in 1.3 so i thougt that i could create a table with only the username and the password (in md5) for the ftp-server and maby link the punbb users with it.

So when a user registers punbb will save the information in users and then mysql will copy it to the other table, lets call it ftp_users, and when a user is deleted it will remove the user from both users and ftp_users, is this possible?

If anyone has any different ideas on how i can solve my problem, please let me know!

//Dean