Feature suggestion: checksums

Come here to discuss FileZilla and FTP in general

Moderator: Project members

Post Reply
500 Command not understood
Posts: 2
Joined: 2016-05-10 23:17
First name: Stephen
Last name: Dunn

Feature suggestion: checksums

#1 Post by entangledloops » 2016-05-10 23:25

I'd love to have the ability to do a quick checksum of two files (or folders) in the left/right pane, doesn't matter which algorithm.

I'm often working on servers where I FTP some medium-large size files (~5 gb) back-and-forth and it would be great to check a box at transfer time to verify sanity.
I know it can't be too much code to implement (*sigh*, nothing's ever easy, I realize that).

Seems like a perfect addition to the "Directory comparison" menu. Didn't see it suggested after briefly searching these forums, but I'll admit I didn't look too hard after a long day of build errors.

User avatar
Posts: 24914
Joined: 2006-05-01 03:28
Location: Germany

Re: Feature suggestion: checksums

#2 Post by boco » 2016-05-11 20:24

FTP unfortunately doesn't support this as there's no direct/random access to files on FTP servers. That would mean,

- the FTP server software has to be told by the user to hash the file on the server directly. Unfortunately, such an official feature doesn't exist. There's a draft proposal to the IETF for a HASH command that would allow this - but don't hold your breath, yet.


- using one of the unofficial commands in existence (CRC/XCRC, MD5/XMD5, SHA/XSHA etc.). FileZilla software will not use these as their implementation is not standardized and thus ambiguous.


- re-download each and any file to check the hash. The burning of resources and the introduced level of uncertainty make that approach effectively useless.


- have the server software maintain hash-tables. Could be a viable option for servers with relatively static content, but not for a live, actively used one.

Yes, it's not easy at all, in this case.
No support requests per PM! You will NOT get any reply!!!
FTP connection problems? Do yourself a favor and read Network Configuration.
All FileZilla products fully support IPv6. http://worldipv6launch.org

Post Reply