$cksum = {
 'chat3-a1.pl' => {
   shortname => 'chat31.pl',
   size => 12927,
   'md5' => '84a0fc0a1a98f83832d64c1dff955596',
   'md5-ungz' => 'd41d8cd98f00b204e9800998ecf8427e'
 }
};