linux – How to check the integrity of files?

I have downloaded software (zipped) from a website

exemple-linux.gtk.x86_64.zip

There is another file given for verification

example-linux.gtk.x86_64.zip.asc

whose content are

—– BEGIN SIGNING PGP —–

Version: GnuPG v1

iQEcBAABAgAGBQJUPdCNAAoJEELXCMAlIIx7wV4IAI0GwTHy2biP4vp8E + YnYV4u
erog2kGvyU99bJud8CKfgBCKXSn9KdZovo4vCbOoyiVJ / iC8EHqNiK8J9IOMcbGz
hEcHnWE7LWaJPGnFokSh / UhSszDXIRyBUrq2pLg71cME1RYU / 2U85ctHxnzFOziD
L3 + rPzeFhJ14MpSWTiFh0fUxf299BzUUJBaKFllNmNHkWS4C / SFKmnmG + U8EIB1P
m / Fk6LP / C5X5OFB / XTmsRZRkMbhrMfn6ykfdNL / ltjynUIaoNJYZm5KJeWlvjyxf
XoBRGHslB4H + yv7Mf0qG9PPNWvBUan65t8YtEqyYlrGgTAzo / Umfkvswuv88TE0 =
= yhw9

—– END OF THE PGP SIGNATURE —–

I'm using linux machine and i want to know how can i check the integrity of .Zip *: French file using .zip.asc file ?