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Check integrity of file transfers (XMD5, XSHA1)
From mail by Stan (19/1/2014, subject 'ftp server')
I'm using fireftp in firefox as client. If enabled, FireFTP will do a hash check after a file transfer. This is used to verify that every bit of the file has transfered correctly. Although rare, sometimes a file can be corrupted when downloaded or uploaded, and a bit can change or could be lost. A hash of a file gives you a short string of characters that uniquely identifies a file. If the FTP server's hash of the file and FireFTP's hash match then splendid, all is well - if they don't match, then your file is corrupted and you should transfer it again. (The FTP server must be configured to allow the XMD5 or XSHA1 command for this option to work.)"
The draft "File Transfer Protocol HASH Command for Cryptographic Hashes" looks more promising than other extensions.