Comment by lukeh

I worked on a Swift ASN.1 compiler [1] a while back (not swift-asn1, mine used Codable). I saved myself some time by using the Heimdal JSON compiler, which can transform ASN.1 into a much more parseable JSON AST.

[1] https://github.com/PADL/ASN1Codable

[2] https://github.com/heimdal/heimdal/tree/master/lib/asn1