113498266Sopenharmony_ci# Rustls 213498266Sopenharmony_ci 313498266Sopenharmony_ci[Rustls is a TLS backend written in Rust](https://docs.rs/rustls/). Curl can 413498266Sopenharmony_cibe built to use it as an alternative to OpenSSL or other TLS backends. We use 513498266Sopenharmony_cithe [rustls-ffi C bindings](https://github.com/rustls/rustls-ffi/). This 613498266Sopenharmony_civersion of curl depends on version v0.10.0 of rustls-ffi. 713498266Sopenharmony_ci 813498266Sopenharmony_ci# Building with rustls 913498266Sopenharmony_ci 1013498266Sopenharmony_ciFirst, [install Rust](https://rustup.rs/). 1113498266Sopenharmony_ci 1213498266Sopenharmony_ciNext, check out, build, and install the appropriate version of rustls-ffi: 1313498266Sopenharmony_ci 1413498266Sopenharmony_ci % cargo install cbindgen 1513498266Sopenharmony_ci % git clone https://github.com/rustls/rustls-ffi -b v0.10.0 1613498266Sopenharmony_ci % cd rustls-ffi 1713498266Sopenharmony_ci % make 1813498266Sopenharmony_ci % make DESTDIR=${HOME}/rustls-ffi-built/ install 1913498266Sopenharmony_ci 2013498266Sopenharmony_ciNow configure and build curl with rustls: 2113498266Sopenharmony_ci 2213498266Sopenharmony_ci % git clone https://github.com/curl/curl 2313498266Sopenharmony_ci % cd curl 2413498266Sopenharmony_ci % autoreconf -fi 2513498266Sopenharmony_ci % ./configure --with-rustls=${HOME}/rustls-ffi-built 2613498266Sopenharmony_ci % make 27