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go/api/next/68500.txt
Roland Shoemaker f69711434a crypto/tls: add server-side ECH
Adds support for server-side ECH.

We make a couple of implementation decisions that are not completely
in-line with the spec. In particular, we don't enforce that the SNI
matches the ECHConfig public_name, and we implement a hybrid
shared/backend mode (rather than shared or split mode, as described in
Section 7). Both of these match the behavior of BoringSSL.

The hybrid server mode will either act as a shared mode server, where-in
the server accepts "outer" client hellos and unwraps them before
processing the "inner" hello, or accepts bare "inner" hellos initially.
This lets the server operate either transparently as a shared mode
server, or a backend server, in Section 7 terminology. This seems like
the best implementation choice for a TLS library.

Fixes #68500

Change-Id: Ife69db7c1886610742e95e76b0ca92587e6d7ed4
Reviewed-on: https://go-review.googlesource.com/c/go/+/623576
Reviewed-by: Filippo Valsorda <filippo@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>
Auto-Submit: Roland Shoemaker <roland@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
2024-11-21 22:50:04 +00:00

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pkg crypto/tls, type Config struct, EncryptedClientHelloKeys []EncryptedClientHelloKey #68500
pkg crypto/tls, type EncryptedClientHelloKey struct #68500
pkg crypto/tls, type EncryptedClientHelloKey struct, Config []uint8 #68500
pkg crypto/tls, type EncryptedClientHelloKey struct, PrivateKey []uint8 #68500
pkg crypto/tls, type EncryptedClientHelloKey struct, SendAsRetry bool #68500