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Filippo Valsorda authored
Implement a basic TLS 1.3 server handshake, only enabled if explicitly requested with MaxVersion. This CL intentionally leaves for future CLs: - PSK modes and resumption - client authentication - compatibility mode ChangeCipherSpecs - early data skipping - post-handshake messages - downgrade protection - KeyLogWriter support - TLS_FALLBACK_SCSV processing It also leaves a few areas up for a wider refactor (maybe in Go 1.13): - the certificate selection logic can be significantly improved, including supporting and surfacing signature_algorithms_cert, but this isn't new in TLS 1.3 (see comment in processClientHello) - handshake_server_tls13.go can be dried up and broken into more meaningful, smaller functions, but it felt premature to do before PSK and client auth support - the monstrous ClientHello equality check in doHelloRetryRequest can get both cleaner and more complete with collaboration from the parsing layer, which can come at the same time as extension duplicates detection Updates #9671 Change-Id: Id9db2b6ecc2eea21bf9b59b6d1d9c84a7435151c Reviewed-on: https://go-review.googlesource.com/c/147017 Run-TryBot: Filippo Valsorda <filippo@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Adam Langley <agl@golang.org>
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