Encrypted large files cant decrypt

[David Shaw]

On Feb 24, 2012, at 7:21 PM, Astrid Staufer wrote:

> 
> Hallo,
> I encrypt with the folowing command on a server a backup and send it on an
> other server over FTP:
> 
> "tar -czf - $mysql_backup_file $directory_to_backup | gpg --no-tty --batch
> --always-trust --recipient $id_number --encrypt | curl --netrc-optional
> --silent --show-error --ftp-create-dirs --retry 10 -u $ftp_user:$ftp_pwd
> ftp://$ftp_host/$ftp_dir$full_backup_file -T -"
> 
> This works with some Backups around 35Mbytes. But I've tested it also with
> an 2.79Gbyte large Backup-File. It runs to the end, but the final encrypted
> File is corrupt. When I try to decrypt it, it says, "no encrypted data
> found"!

Since small files work, and 2.79gb doesn't, one thing to check is whether your whole pipeline (including the remote ftp server) can handle large (i.e. greater than 2^31 bytes) files.  That would manifest itself as things starting to break at the 2gb mark.

David