Where is the PEM file format specified?

Question

I need to parse .PEM files.
I know that the standard for \"Privacy-enhanced Electronic Mail\" is defined in RFCs 1421-24. But they don\'t seem to mention some text I fin

Answer 1

I found an old thread regarding this issue. It looks like there is no "official" standard format for the encapsulation boundaries and the best way to determine this is by guessing the contents based on well-known keywords you find in the BEGIN statement.

As answered by indiv, for the full list of the keywords, refer to the OpenSSL crypto/pem/pem.h header file.