debian archive integrity check tool?

[Václav Ovsík <vaclav.ovsik@i.cz>]

Hi,
please, is there any utility/script, that can verify integrity of Debian
archive?  A maintainer of the ftp mirror ftp.linux.cz asks for this in
a national mailling list about Linux systems. He needs this for non
Debian system.
I reply him, that it should not be too dificult to generate input for
`md5sum -c -' from Release & Packages files using perl and can do it,
but I think, that something must exists already.
So, is there some utility, that can verify checksums from archive index
files (integrity of archive)?
Thanks.
-- 
Zito