facebookincubator/fizz

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

1200 stars · 172 forks observed · 2026-09-03

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Fizz is a C++14 implementation of the TLS 1.3 protocol, supporting all major handshake modes including PSK resumption, early data, client authentication, and HelloRetryRequest. It provides asynchronous APIs built on folly Futures and is optimized for high-throughput, low-memory server workloads.

Use cases

• implement TLS 1.3 encryption in a C++ server
• add TLS 1.3 support to a custom network protocol
• secure client-server communication with PSK resumption and early data
• replace OpenSSL-based TLS with a faster async library
• build a TLS client or server in C++ with folly integration
• offload certificate signing and ticket decryption asynchronously

When to choose

• you need a modern TLS 1.3 implementation in C++ with async APIs
• your stack already uses folly and you want tight integration
• you need high-throughput TLS with low memory overhead per connection
• you need TLS 1.3 features like early data, PSK resumption, or HelloRetryRequest

When to avoid

• you need a general-purpose TLS library supporting TLS 1.2 and older versions
• you want a simple synchronous API without a folly dependency
• you work in a language other than C++
• you need a small dependency footprint - fizz requires folly, OpenSSL, and libsodium

Facets

library · maturity active

security cryptography networking http-server http-client security networking backend developer-tools cpp windows cross-platform tls-1-3 tls ssl folly openssl libsodium async facebook linux macos

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markdown · JSON · MCP: product_card(name="facebookincubator/fizz")