Source can be found here:
https://download.kde.org/stable/calligra/3.2.0/calligra-3.2.0.tar.xz

Signed with key:
https://share.kde.org/index.php/s/pYwk5c7UNcXGYfP
Fingerprint:
42A6 0D06 F449 E895 F40F  09C0 1638 B8A6 1610 8B8A

-- 
Cheers, Dag