[ecesena]

We rebuilt solo v2 [1] firmware in rust, compared to v1 in C [2]. I haven't written any rust code so take what I say with a grain of salt, but generally speaking I think our experience has been very positive.

Rust forced us to structure the code a bit better, that makes it easier for multiple people to collaborate on it. Slightly harder learning curve, but that wasn't an issue in our case.

In the history of solo, we had a couple security bugs that rust would probably have prevented, so this is a plus for the language. Moreover, the cryptography community is pretty active and we can leverage solid + well maintained libraries.

One downside has been collaboration with other OS projects. When we had the C firmware and fido2 library, in less than 1 year we've got 3 other products embedding our code and also a couple manufacturers making demos with it -- a great win. With rust to my knowledge we're not there yet, but of course we're very positive.

[1] https://github.com/solokeys/solo2

[2] https://github.com/solokeys/solo1