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<!--
Copyright (C) Daniel Stenberg, <[email protected]>, et al.
SPDX-License-Identifier: curl
-->
# Rustls
[Rustls is a TLS backend written in Rust](https://docs.rs/rustls/). Curl can
be built to use it as an alternative to OpenSSL or other TLS backends. We use
the [rustls-ffi C bindings](https://github.com/rustls/rustls-ffi/). This
version of curl depends on version v0.14.0 of rustls-ffi.
# Building with Rustls
First, [install Rust](https://rustup.rs/).
Next, check out, build, and install the appropriate version of rustls-ffi:
% git clone https://github.com/rustls/rustls-ffi -b v0.14.0
% 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
See the [rustls-ffi README] for more information on cryptography providers and
their build/platform requirements.
[rustls-ffi README]: https://github.com/rustls/rustls-ffi/blob/main/README.md#cryptography-provide
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