tls: Hybrid key exchange of ECC and Post-Quantum

Kazu Yamamoto (山本和彦) via Haskell-Cafe <[email protected]> Thu, 26 Feb 2026 16:37:31 +0900 (JST)
Newsgroups gmane.comp.lang.haskell.cafe
Message-ID <[email protected]>
Hello,

TLS client of OpenSSL version 3.5 or later specifies hybrid key
exchange of ECC and Post-Quantum (such as X25519MLKEM768) and an ECC
key exchange (such as X25519) in TLS ClientHello.

I have implemented both the hybrid algorithms and the OpenSSL
specifying-method in the Haskell "tls" library. Interop with OpenSSL
is quite good.

I would like to discuss how to specify algorithms in ClientHello
before releasing. If you are interested, I would like to invite you to
this issue:

https://github.com/haskell-tls/hs-tls/issues/516

I thank Olivier Chéron for implementing excellent "mlkem" library.

--Kazu


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