[erlang-patches] TLS 1.2: Calculate handshake hash only when needed

[Andreas Schultz]

Hi,

Some time ago we discussed how to split the TLS 1.2 changes
for review. Here is the first part of that. It is possibly
the most intrusive part, but also the simplest to review.

git fetch git@REDACTED:RoadRunnr/otp.git tls12-to-upstream

https://github.com/RoadRunnr/otp/compare/tls12-to-upstream
https://github.com/RoadRunnr/otp/compare/tls12-to-upstream.patch

Calculate handshake hash only when needed

TLS/SSL version before 1.2 always used a MD5/SHA combination
for the handshake hashes. With TLS 1.2 the default hash is
SHA256 and it is possible to negotiate a different hash.

This change delays the calculation of the handshake
hashes until they are really needed. At that point the hash
to use should be known.

For now MD5/SHA is still hard coded.

Andreas

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