Feature flags of Boring crate // Lib.rs

Cargo Features

Boring has no features set by default.

[dependencies]
boring = { version = "4.6.0", features = ["fips", "fips-link-precompiled", "rpk", "pq-experimental", "underscore-wildcards", "kx-safe-default", "kx-client-pq-supported", "kx-client-pq-preferred", "kx-client-nist-required"] }

fips: Controlling the build

Use a FIPS-validated version of boringssl.

Enables fips of boring-sys
fips-link-precompiled: Link with precompiled FIPS-validated bcm.o module.

Enables fips-link-precompiled of boring-sys
rpk: Enables Raw public key API (https://datatracker.ietf.org/doc/html/rfc7250) This feature is necessary in order to compile the bindings for the default branch of boringSSL. Alternatively, a version of boringSSL that implements the same feature set can be provided by setting BORING_BSSL{,_FIPS}_SOURCE_PATH and BORING_BSSL{,_FIPS}_ASSUME_PATCHED.

Enables rpk of boring-sys
pq-experimental: Applies a patch to the boringSSL source code that enables support for PQ key exchange. This feature is necessary in order to compile the bindings for the default branch of boringSSL. Alternatively, a version of boringSSL that implements the same feature set can be provided by setting BORING_BSSL{,_FIPS}_SOURCE_PATH and BORING_BSSL{,_FIPS}_ASSUME_PATCHED.

Enables pq-experimental of boring-sys
underscore-wildcards: Applies a patch to enable ffi::X509_CHECK_FLAG_UNDERSCORE_WILDCARDS. Same caveats as those for pq-experimental feature apply.

Enables underscore-wildcards of boring-sys
kx-safe-default kx-client-nist-required? kx-client-pq-preferred? kx-client-pq-supported?: Controlling key exchange preferences at compile time
Choose key exchange preferences at compile time. This prevents the user from choosing their own preferences.
kx-client-pq-supported kx-client-pq-preferred? = kx-safe-default: Support PQ key exchange. The client will prefer classical key exchange, but will upgrade to PQ key exchange if requested by the server. This is the safest option if you don't know if the peer supports PQ key exchange. This feature implies "kx-safe-default".
kx-client-pq-preferred = kx-client-pq-supported, kx-safe-default: Prefer PQ key exchange. The client will prefer PQ exchange, but fallback to classical key exchange if requested by the server. This is the best option if you know the peer supports PQ key exchange. This feature implies "kx-safe-default" and "kx-client-pq-supported".
kx-client-nist-required = kx-safe-default: Disable key exchange involving non-NIST key exchange on the client side.
Implies "kx-safe-default".