As of today, Rustls has made AWS Libcrypto its default cryptographic library, offering FIPS support as an option. This change opens up safer TLS possibilities for many organizations. The introduction of pluggable cryptography allows users to choose between aws-lc-rs and ring for cryptography, with additional support coming soon from Rust Crypto, Mbed TLS, and BoringSSL. The decision to make aws-lc-rs the default was due to its high quality and FIPS support, as well as the great collaboration with the AWS cryptography team. Benchmarking has also been implemented to ensure optimal performance. With future plans for an OpenSSL compatibility layer, Rustls is making big strides towards a more secure Internet with support from funders like AWS, Google, and more.
https://www.memorysafety.org/blog/rustls-with-aws-crypto-back-end-and-fips/