rust-asn1

The Python library proposed in TFA is to be based on a different, DER-only Rust ASN.1 library[1]. So ASN.1 in Rust is more than tangentially relevant here. [1] https://github.com/alex/rust-asn1

> I feel like this really only makes sense if pyca/cryptography had planned on adding the Rust dependency from the very beginning (or from very early on). Is there any indication that was the case? I am sure this idea surfaced several times in IRC or possibly in the mailing lists. Certainly, the authors have been toying with handling ASN.1 in rust since 2015 [1], which I guess will be the next logical step. I do agree that this is mostly a political stance. pyca/cryptography is a wrapper sandwiched between a gigantic runtime written in C (CPython/PyPy) and a gigantic library written in C (openssl). The addition of Rust as dependency enables the inclusion of just 90 lines of Rust [2] where the only part that really couldn't be implemented in pure Python is a line copied from OpenSSL [3] (i.e. it was already available), and which is purely