[jaas]

I think what you're quoting says what I was saying - assembly with some C around it, wrapped in a Rust API. At least for the "select" (read: most important) algorithms. The details of the C/asm boundary in aws-lc are hard to summarize.

Ideally the C would eventually move to Rust, but I think aws-lc needs to work in many contexts where a Rust toolchain is not available so it might be a while.

Graviola is an interesting option under development, in part because it gets rid of the C:

https://github.com/ctz/graviola