cURL supports rustls

curl is an internet transfer engine. A rather modular one too. Parts of curl’s functionality is provided by selectable alternative implementations that we call backends . You select what backends to enable at build-time and in many cases the backends are enabled and powered by different 3rd party libraries.

Today, we merged support for yet another TLS library: rustls. This is a TLS library written in rust and it has a C API provided in a separate project called crustls. Strictly speaking, curl is built to use crustls.

This is still early days for the rustls backend and it is not yet feature complete. There’s more work to do and polish to apply before we can think of it as a proper competitor to the already established and well-used TLS backends, but with this merge it makes it much easier for more people to help out and test it out. Feel free and encouraged to join in!

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