RTG-3333 Support X25519MLKEM768 by default, but don't sent it as client #306
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X25519MLKEM768 is the standardised successor of the preliminary X25519Kyber768Draft00. Latest browsers have switched to X25519MLKEM768. Cloudflare supports both on the edge. We've had support for X25519MLKEM768 in this crate for a while, but didn't enable by default. We're now enabling serverside support by default. We also let clients advertise support when set to kx-client-pq-supported. We don't enable support by default yet for clients set to kx-client-pq-preferred, as that would cause an extra round-trip due to HelloRetryRequest if the server doesn't support X25519MLKEM768 yet. BoringSSL against which we build must support X25519MLKEM768, otherwise this will fail.
kornelski
approved these changes
Jan 13, 2025
rushilmehra
approved these changes
Jan 13, 2025
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X25519MLKEM768 is the standardised successor of the preliminary X25519Kyber768Draft00. Latest browsers have switched to X25519MLKEM768. Cloudflare supports both on the edge.
We've had support for X25519MLKEM768 in this crate for a while, but didn't enable by default. We're now enabling serverside support by default. We also let clients advertise support when set to kx-client-pq-supported.
We don't enable support by default yet for clients set to kx-client-pq-preferred, as that would cause an extra round-trip due to HelloRetryRequest if the server doesn't support X25519MLKEM768 yet.
BoringSSL against which we build must support X25519MLKEM768, otherwise this will fail.