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Notes:
- https://gist.github.com/Soarez/9688998 : How to setup your own CA with OpenSSL
- https://medium.com/@raul_11817/export-import-pem-files-in-go-67614624adc7
- https://gist.github.com/ukautz/cd118e298bbd8f0a88fc : Load all .pem files containing private key and certificate(s) from directory
- https://wiki.hackzine.org/sysadmin/openssl-commands.html