[Bug 49543] New: Several games require bcrypt DH support

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49543

            Bug ID: 49543
           Summary: Several games require bcrypt DH support
           Product: Wine
           Version: 5.12
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bcrypt
          Assignee: wine-bugs at winehq.org
          Reporter: bshanks at codeweavers.com
      Distribution: ---

There are a few games that need DH support in bcrypt.

- The Rockstar Games Launcher, GTA V, and RDR 2 all open DH and generate+export
a public key. With DH unimplemented, the only effect I know of is that RDR 2's
online mode fails to load.
- Astroneer dedicated server (see
https://www.reddit.com/r/wine_gaming/comments/gvaa9a/bcryptopenalgorithmprovider_algorithm_ldh_not/).
>From a disassembler, it looks like the server imports/exports public/private
keys, and uses BCryptDeriveKey() with the "HASH" KDF and SHA256.

Microsoft has sample code which tests (some of) the functionality:
https://github.com/microsoft/Windows-classic-samples/blob/master/Samples/Security/DhOakleyGroup1/cpp/DhOakleyGroup1.cpp

Unfortunately GnuTLS doesn't currently export the needed functionality. There's
an issue open: https://gitlab.com/gnutls/gnutls/-/issues/894

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