TLS grain could provide JA3(s) hashes (or at least what is needed to calculate them)

[gdemarcsek]

I was wondering why not to provide the following additional context for TLS client hello measurements:

https://docs.rs/rustls/0.15.1/rustls/internal/msgs/handshake/struct.ClientHelloPayload.html#structfield.extensions

https://docs.rs/rustls/0.15.1/rustls/internal/msgs/handshake/struct.ClientHelloPayload.html#method.get_ecpoints_extension

https://docs.rs/rustls/0.15.1/rustls/internal/msgs/handshake/struct.ClientHelloPayload.html#method.get_namedgroups_extension

This would allow the receiver to calculate JA3 (https://github.com/salesforce/ja3) hashes - or ingraind could do the calulcation itself depending on your design goals. (Data for JA3s could similarly be collected from server hello payloads)

[rsdy]

This is a great idea, and we'll definitely consider it. Thanks for bringing it up!