On Aug 11, 2015, at 2:03 PM, Robert Sandilands <rsandila at netscape.net> wrote: > So this leads to the next question: > > How do I teach OpenSSL the format of the value for a custom extension without writing code? What do you want OpenSSL to do with that knowledge? Presumably, the reason you're adding a custom extension is that some software, somewhere, is going to look for it and act upon it. That software will need some coding, right?