This is the certificate check written for Ignition.
I have provided old certificates as an example.
In Terminal
cd /path/to/revokeCheckerFolder/
chmod a+x check.sh
chmod a+x getCA.sh
chmod a+x readCerts.sh
chmod a+x request.sh
chmod a+x revokeChecker.sh
In terminal run
./revokeChecker.sh
Please Note, for this the password must be the p12 name.
In terminal run
./check.sh "/path/to/password.p12"