Support decrypting TLS 1.3 handshakes with PQ key exchange

[dcooper16]

Describe your changes

This PR modifies testssl.sh so that TLS 1.3 handshakes that use post-quantum algorithms for key exchange can be decrypted, if $OPENSSL supports the algorithms.

What is your pull request about?

• Bug fix
• Improvement
• New feature (adds functionality)
• Breaking change (bug fix, feature or improvement that would cause existing functionality to not work as expected)
• Typo fix
• Documentation update
• Update of other files

If it's a code change please check the boxes which are applicable

• For the main program: My edits contain no tabs, indentation is five spaces and any line endings do not contain any blank chars
• I've read CONTRIBUTING.md and Coding_Convention.md
• I have tested this fix or improvement against >=2 hosts and I couldn't spot a problem
• I have tested this new feature against >=2 hosts which show this feature and >=2 host which does not (in order to avoid side effects) . I couldn't spot a problem
• For the new feature I have made corresponding changes to the documentation and / or to help()
• If it's a bigger change: I added myself to CREDITS.md (alphabetical order) and the change to CHANGELOG.md

[drwetter]

Hi David,

first: awesome !

Looking forward if someone reads the code and like to understand what it does, it would be cool if there would be some comments explaining that better.

[drwetter]

Also, as it's worth to mention: Amending the CHANGELOG.md / Credits.md would be appropriate

[dcooper16]

I added some more comments, but I don't think anything more needs to be added to CHANGELOG.md orCredits.md. They already mention support for the PQC key exchange groups and for decrypting TLS 1.3 traffic.

[drwetter]

Super!