You could also try this "Hash Checker"
HOW TO INSTALL/UNINSTALL
Just run ‘Setup’ script and follow the instructions.
cd into Hash Checker’s folder and type ‘./Setup –help’ (without quotes) to see available language switches
Using with Nautilus:
Right-click somewhere in Nautilus, go to Scripts > Check hash(es) then browse to the file you want to check
or (to avoid browsing for a file)
just right-click on the file you want to check then go to Scripts > Check hash(es).
Using with any File Manager:
Click at the Hash Checker’s desktop icon to run it, then browse to the file you want to check
Zenity (for displaying GUI)
md5sum and sha256sum (most distros have them both by default)
I got it from this site
You can also see this
This was mentioned in the comments of the first site.