I read RFC 3280 (
https://tools.ietf.org/html/rfc3280#section-4), but apparently missing something and can not correctly understand the structure of the certificate.
For RFC 4346 the wiki has a good article where it is clearly visible in all fields (
https://en.wikipedia.org/wiki/Transport_Layer_Secu... not do the same for X. 509 v3 certificate?
I studied the output of WireShark, but for some reason it skips some of the bits in the certificate, apparently considering them too obvious and self-explanatory...
The issue has been resolved by the application program commands for working with X509 certificates from composition OpenSSL: openssl x509 -in certificate.der -inform der -text-noout