The "kx-*" features control default key exchange preferences. Its
implementation requires disabling APIs for manually setting curve
preferences via `set_curves()` or `set_curves_list()`.
In practice, most teams need to be able to override default preferences
at runtime anyway, which means these features were never really used.
This commit gets rid of them, thereby reducing some complexity in the
API.
SslStream::new() is fallible, but `SslStream::from_raw_parts()` and
`SslStreamBuilder::new()` now unwrap. Upstream has also deprecated the
`SslStreamBuilder`, maybe we should do the same.
Per BoringSSL's FIPS policy, its `main` branch is the "update branch"
for FedRAMP compliance's purposes.
This means that we can stop using a specific BoringSSL branch when
enabling FIPS, as well as a number of hacks that allowed us to build
more recent BoringSSL versions with an older pre-compiled FIPS modules.
This also required slightly updating the main BoringSSL submodule, as
the previous version had an issue when building with the FIPS option
enabled. This is turn required some changes to the PQ patch as well as
some APIs that don't seem to be exposed publicly, as well as changing
some paths in the other patches.
In order to allow a smooth upgrade of internal projects, the `fips-compat`
feature is reduced in scope and renamed to `legacy-compat-deprecated` so
that we can incrementally upgrade internal BoringSSL forks. In practice
this shouldn't really be something anyone else would need, since in
order to work it requires a specific mix of BoringSSL version and
backported patches.
As X509_STORE_CTX_init requires its arguments to outlive
the store context, we take ownership of all of them
and put them in the store context's ex data, ensuring
the soundness of the operation without the mandatory
call to X509_STORE_CTX_cleanup after a closure
is run.
Apoorv Kothari