* .gz files on "http://www.measurement-factory.com/tmp/ecap/" are not in a gzip compressed format (are not compressed). Also all md5sum are wrong!
Link to a FAQ
Do not panic! They are compressed and checksums are correct, but your browser is trying to be helpful and is decompressing them for you.
$ wget http://www.measurement-factory.com/tmp/ecap/checksums
$ wget http://www.measurement-factory.com/tmp/ecap/ecap_clamav_adapter-2.0.0.tar.gz
$ file ecap_clamav_adapter-2.0.0.tar.gz
ecap_clamav_adapter-2.0.0.tar.gz: gzip compressed data, ...
$ gunzip -vt ecap_clamav_adapter-2.0.0.tar.gz
$ md5sum ecap_clamav_adapter-2.0.0.tar.gz
$ fgrep ecap_clamav_adapter-2.0.0.tar.gz checksums
MD5 (ecap_clamav_adapter-2.0.0.tar.gz) = 2647c1125c69bd83d66f56bee56a9a68
Thanks a lot! Not used to use Chrome. Firefox doesn't operate like that...