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Make ESNI TLS 1.2 compatible #38

@kontaxis

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@kontaxis

ESNI seems to rely on TLS 1.3 KeyShareEntry which makes it incompatible with TLS 1.2.

That's unfortunate with that "The protocol designed in this document is quite straightforward."

The gist of ESNI comes down to "encrypted_server_name extension, which contains the true extension encrypted under the provider’s public key."

That seems pretty generic and backwards compatible.

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