Despite BoringSSL’s “not intended for general use” warning, it’s used by many projects:
- The “ring” rust crate’s crypto primitives (used by Rustls)
- Cloudflare: used everywhere, including Quiche.
- Apple’s Secure Transport (it’s in both major mobile OSes!)
- Optionally: Nginx, libcurl
I use nginx-quic with BoringSSL without issue, although I did have to use a separate script to manage the OCSP cache. The script manages the cache better than Nginx ever did, so I recommend it; it should be trivial to switch it from OpenSSL to LibreSSL.