If you ran into ASN.1 run away (if you can). It's so insane hopeless overenginered with so many intersecting standard, different representations and nobes that

If you ran into ASN.1 run away (if you can). It's so insane hopeless overenginered with so many intersecting standard, different representations and nobes that it can easily become a nightmare. Most parsers also only support an opinionated subset for a specific purpose simply rejecting everything outside of the supported sunset even if they by specification should support it. This night sound fine, until you actually run into it in production and two supposedly compatible systems more are incompatible with no easy fix around.