adler32 checksums strings calculated by StoRM WebDAV can be shorter than 8 characters, since the current code does not add leading 0s.

While this is fine according to the HTTP protocol specs, it would be better to align with the current StoRM GridFTP implementation that ensures the stored checksum is always 8-chars long by adding leading 0s:

https://github.com/italiangrid/storm-gridftp-dsi/blob/master/src/globus_gridftp_server_StoRM.c#L430