Improve ECC support in TLS 1.2 (RFC 8422) #424
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The Go implementation of TLS dislikes client hello without a ECPointFormats extension, so let's revert from mirleft#413 and re-add this extension with a single value (uncompressed) to client hello (and server hello if client sent it, and an ECC ciphersuite was selected). In TLS 1.3 only settings, this change is a no-op.
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CHANGES: * Re-add ECPointFormats hello extension (both client and server) to avoid handshake failures with Go's TLS stack (RFC 8422 makes it optional, but go (1.15.5) requires it) - reported by @jeffa5 at https://discuss.ocaml.org/t/strange-prohibited-tls-1-2-cipher-suite-9d-issue/ fix by @hannesm mirleft/ocaml-tls#424
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The Go implementation of TLS dislikes client hello without a ECPointFormats
extension, so let's revert from #413 and re-add this extension with a single
value (uncompressed) to client hello (and server hello if client sent it, and
an ECC ciphersuite was selected).
In TLS 1.3 only settings, this change is a no-op.