cloudflare/boring

cloudflare/boring

Description: BoringSSL bindings for the Rust programming language.

Language: Rust

Stars: 498

Forks: 160

Open issues: 47

Created: 2020-11-09T00:50:41Z

Pushed: 2026-06-04T14:29:29Z

Default branch: master

Fork: no

Archived: no

README:

boring

BoringSSL is Google's fork of OpenSSL for Chrome/Chromium and Android.

This crate provides safe bindings for the Rust programming language and TLS adapters for tokio and hyper built on top of it.

It supports FIPS-compatible builds of BoringSSL, as well as Post-Quantum crypto and Raw Public Key extensions.

Documentation

• Boring API:
• tokio TLS adapters:
• hyper HTTPS connector:
• FFI bindings:

Upgrading from boring v4

• First update to boring 4.22 and ensure it builds without any deprecation warnings.
• pq-experimental Cargo feature is no longer needed. Post-quantum crypto is enabled by default.
• fips-precompiled Cargo feature has been merged into fips. Set BORING_BSSL_FIPS_PATH env var to use a precompiled library.
• fips-compat Cargo feature has been renamed to legacy-compat-deprecated (4cb7e260a85b7)
• SslCurve and SslCurveNid have been removed. Curve names are more stable and portable identifiers. Use curve_name() and set_curves_list().
• Ssl::new_from_ref -> Ssl::new().
• X509Builder::append_extension2 -> X509Builder::append_extension.
• X509Store is now cheaply cloneable, but immutable. SslContextBuilder.cert_store_mut() can't be used after .set_cert_store(). If you need .cert_store_mut(), either don't overwrite the default store, or use .set_cert_store_builder().
• X509StoreBuilder::add_cert takes a reference.
• hyper 0.x support has been removed. Use hyper 1.x.

To support both v4 and v5, add boring = ">=4.22,=4.22,<6" as a direct dependency, and in your build.rs check if DEP_BORINGSSL_VERSION_MAJOR env var is set to 5. Versions older than 5.2.0 don't set it.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed under the terms of both the Apache License, Version 2.0 and the MIT license without any additional terms or conditions.

Accolades

The project is based on a fork of rust-openssl.