Getting update signature from package file

Is it possible to get the update signature from an uninstalled, locally
built, package?

I tried with

doas pkg_info -q -S
/usr/ports/packages/amd64/all/libtool-2.4.2p0.tgz

but got

file:/usr/ports/packages/amd64/all/libtool-2.4.2p0.tgz: unsigned package
(signify(1) doesn't see old-style signatures)

After installing the package, one can do "pkg_info -q -S", but I'd like
to see the signature without having to install it.

Regards,

--
Andreas Kusalananda Kähäri,
National Bioinformatics Infrastructure Sweden (NBIS),
Uppsala University, Sweden.








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