curl/docs/RUSTLS.md

Rustls

Rustls is a TLS backend written in Rust. Curl can be built to use it as an alternative to OpenSSL or other TLS backends. We use the rustls-ffi C bindings. This version of curl depends on version v0.9.2 of rustls-ffi.

Building with rustls

First, install Rust.

Next, check out, build, and install the appropriate version of rustls-ffi:

% cargo install cbindgen
% git clone https://github.com/rustls/rustls-ffi -b v0.9.2
% cd rustls-ffi
% make
% make DESTDIR=${HOME}/rustls-ffi-built/ install

Now configure and build curl with rustls:

% git clone https://github.com/curl/curl
% cd curl
% autoreconf -fi
% ./configure --with-rustls=${HOME}/rustls-ffi-built
% make