sim: Change to `ring` instead of `rust-crypto`
The ring crate's SHA256 is slightly slower than the one from
rust-crypto, but is much cleaner to use. It also has all of the hashing
operations we need.
This crate is somewhat opinionated, e.g. will not sign messages without
also performing the signature itself. Unfortunately, this means we'll
end up computing signatures of the same data many times, and perhaps
this should be improved, since we're always using the same data.
Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/sim/src/main.rs b/sim/src/main.rs
index aa7c75d..614def3 100644
--- a/sim/src/main.rs
+++ b/sim/src/main.rs
@@ -1,5 +1,5 @@
#[macro_use] extern crate log;
-extern crate crypto;
+extern crate ring;
extern crate env_logger;
extern crate enumflags;
#[macro_use] extern crate enumflags_derive;