running openssl dhparam in %post

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For reSIProcate 1.10.0, we will support PFS on TLS connections, this
requires a DH parameters file to be generated on each installation of
the package.  There is probably a similar requirement for other packages
that have a TLS server and don't generate DH parameters at compile time.

My current solution involves adding the following to %post


    if [ ! -e %{_sysconfdir}/repro/dh2048.pem ] ;
    then
      /usr/bin/openssl dhparam -outform PEM \
           -out %{_sysconfdir}/repro/dh2048.pem 2048
      chown root:repro %{_sysconfdir}/repro/dh2048.pem
      chmod 0640 %{_sysconfdir}/repro/dh2048.pem
    fi


and then adding this to %files


    %config(missingok) %ghost %{_sysconfdir}/repro/dh2048.pem


The dh2048.pem file is created correctly during package installation but
it is not removed when the package is removed with "rpm -e"

Is there a better way to do this or does it look OK?
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