Tracked here:
Issue 374 – Optionally compare checksums of file after transfer

OK, I'll try to contact VanDyke to see if this is feature of their client or of their server. It may be both. Thanks for hint.

Actually, I have. VanDyke's SecureFX has this capability. I think they permit command line SSH to the destination box and then run MD5. MD5 has to be loaded on the destination box for this to work -- but I have used it.

Have you seen any other FTP/SFTP/SCP client doing this? I cannot imagine how to do it wihout downloading the file back to local machine.

Since this a file transfer program with encryption capabilties, I would REALLY like to see an automated MD5 hash take place on the transferred file after transfer has been completed -- and have the MD5 result show somewhere on the screen. Or at least have this as an option for those who may not need to use it. https://www.fourmilab.ch/md5/ has a freeware/public-domain program that you might be able to incorporate easily into your product.