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/*! # Using rustls with FIPS-approved cryptography
To use FIPS-approved cryptography with rustls, you should take
these actions:
## 1. Enable the `fips` crate feature for rustls.
Use:
```toml
rustls = { version = "0.23", features = [ "fips" ] }
```
## 2. Use the FIPS `CryptoProvider`
This is [`default_fips_provider()`]:
```rust,ignore
rustls::crypto::default_fips_provider()
.install_default()
.expect("default provider already set elsewhere");
```
This snippet makes use of the process-default provider,
and that assumes all your uses of rustls use that.
See [`CryptoProvider`] documentation for other ways to
specify which `CryptoProvider` to use.
## 3. Validate the FIPS status of your `ClientConfig`/`ServerConfig` at run-time
See [`ClientConfig::fips()`] or [`ServerConfig::fips()`].
You could, for example:
```rust,ignore
# let client_config = unreachable!();
assert!(client_config.fips());
```
But maybe your application has an error handling
or health-check strategy better than panicking.
# aws-lc-rs FIPS approval status
This is covered by [FIPS 140-3 certificate #4816][cert-4816].
See [the security policy][policy-4816] for precisely which
environments and functions this certificate covers.
Later releases of aws-lc-rs may be covered by later certificates,
or be pending certification.
For the most up-to-date details see the latest documentation
for the [`aws-lc-fips-sys`] crate.
[`aws-lc-fips-sys`]: https://crates.io/crates/aws-lc-fips-sys
[`default_fips_provider()`]: crate::crypto::default_fips_provider
[`CryptoProvider`]: crate::crypto::CryptoProvider
[`ClientConfig::fips()`]: crate::client::ClientConfig::fips
[`ServerConfig::fips()`]: crate::server::ServerConfig::fips
[cert-4816]: https://csrc.nist.gov/projects/cryptographic-module-validation-program/certificate/4816
[policy-4816]: https://csrc.nist.gov/CSRC/media/projects/cryptographic-module-validation-program/documents/security-policies/140sp4816.pdf
*/