PyDERASN – strict and fast ASN.1 DER/BER library for Python¶
I’m going to build my own ASN.1 library with slots and blobs! (C) PyDERASN’s author
ASN.1 (Abstract Syntax
Notation One) is a standard for abstract data serialization. PyDERASN is
yet another library for dealing with ASN.1 structures, decoding them in
BER/CER/DER formats and
encoding to DER (Distinguished Encoding Rules). Although ASN.1 is
written more than 30 years ago by wise Ancients (taken from pyasn1
’s
README), it is still often can be seen anywhere in our life.
PyDERASN is free software, licenced under GNU LGPLv3.

An example of pretty printed X.509 certificate with automatically parsed DEFINED BY fields.