b678c70508
The default datatypes always have Universal as their class. If we encounter another class while parsing, it is a tagged block. I am not sure how (and if at all) we can distinguish explicitly and implicitly tagged data. For now they should be parsed as unknown (or explicit if they are a valid ASN.1 block).
Overview
This is a simple library for parsing DER-encoded data.
In particular, this library automates the process of understanding the DER encoded objects in an ASN.1 data stream. These tokens can then be parsed by your library, based on the ASN.1 description in your format.
For convenience, we create the traits ToASN1 and FromASN to abstract the
ability to decode a type from an ASN.1 token stream. If your type implements one
of these traits, your program or library can then use the convenience functions
der_encode and der_decode to do all the parsing work in one action.
Patches welcome!