SFTP-6 has been implemented now. But I've found that WinSSHD actually implements the hashing already in SFTP-4, but it fails to announce the support for this (still the same with SFTP-6):
https://winscp.net/tracker/1191

This request has been added to tracker.

For this, I'm using WinSSHD (https://bitvise.com/download-area). An implementation of v6 would offer file hashing*, ctimes, and linking. There's a bunch of other stuff, too, as I'm sure you're aware, but those are the ones that matter to me.


*I know v5 has it, but as I mentioned, WinSSHD apparently doesn't support v5 (at least for now).

It should be easy. What server are you using? What function are you looking for?

Would it be hard to add sftp v6 support to WinSCP? The server I'm using apparently doesn't support SFTPv5... only sFTPv4 and sFTPv6. Four is lacking some features I'd like to use.