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F*: A general-purpose proof-oriented programming language
For engineers building security-critical or high-assurance systems, F* provides a path to formally verified code that runs in production environments, including the Linux kernel, Mozilla Firefox, and Azure's network stack via Hyper-V. The language's compilation targets (C via KaRaMeL, assembly via Vale, and Wasm) mean verified specifications can ship as performant native code rather than staying in academic prototypes.
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F* programs compile by default to OCaml, with extraction tools (KaRaMeL and Vale) enabling compilation of subsets to C, Wasm, and assembly for production deployment.
Verified cryptographic code from F* projects (HACL*, ValeCrypt, EverCrypt) is already running in production systems including Mozilla Firefox, the Linux kernel, Python, mbedTLS, the Tezos blockchain, the ElectionGuard SDK, and Wireguard VPN.
EverParse, a binary format parser generator producing C code extracted from formally proven F*, parses and validates every network packet passing through Azure's cloud platform in Windows Hyper-V and is also used in ebpf-for-windows.
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