[gnutls-devel] GnuTLS | Ensure we are sending the right protocol version on second client hello (!724)

Development of GNU's TLS library gnutls-devel at lists.gnutls.org
Fri Aug 3 14:31:54 CEST 2018

New Merge Request !724


Branches: tmp-hrr-protov-fix to master
Author:    Nikos Mavrogiannopoulos
Approvers: Simon Josefsson, Dmitry Eremin-Solenikov, Hubert Kario, Tim Rühsen, Andreas Metzler, Daiki Ueno, Tom, Ander Juaristi, Tomáš Mráz, Anderson Sasaki and GnuTLS devel mailing list

That is, when we respond to a Hello Retry Request as client, we put the TLS1.2 version on the second client hello to send a hello that is as close as possible to the original hello. That effectively separates the handling of TLS1.2 rehandshake and TLS1.3 hello retry request when sending a client hello.
Resolves #535

## Checklist
 * [x] Code modified for feature
 * [x] Test suite updated with functionality tests

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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