mysqlnd MariaDB ed25519 authentication plugin

[rusher]

implementation for #14258

This requires libsodium 1.0.17 or later

[rusher]

I've submitted this to current 8.5 branch, it would be great if this is backported to 8.4 as well, since 8.5 release date is 4 month from now

[bukka]

Why can't you use OpenSSL?

[rusher]

OpenSSL doesn't expose the low-level scalar multiplication directly, while libsodium (since 1.0.17) does

[bukka]

I thought that this is being addressed as per #14258 (comment) so it will be possible to use OpenSSL. Is that not the case?

[bukka]

You really need to do something that is possible to do using OpenSSL. Otherwise I don't think we can accept this without RFC.

[bukka]

Just to clarify my reservation here. The issue here is that libsodium stayed a single maintainer library and it's development slowed down a bit - it is still maintained but if that one person stops maintaining it, we will have to start considering removing the extension so I would prefer we do not add additional core dependencies on it. Or at least any new dependency on it really needs to be discussed and we will need to vote about it.