Encryption Function Error?

[Nyosy]

Vendor ID = HP
Product ID = Ultrium 6-SCSI
Product Name =[Ultrium 6-SCSI]

I have HP Ultrium 6 tape drive and I try to use the encryption function. (my tape drive support it)
I typed command
'mkltfs -d $SERIAL --kmi-backend=simple -o kmi_dki_for_format=$KEYINDEX -o kmi_dk_for_format=$KEY'
but the message displayed.
'LTFS30243E Encryption feature is not supported on the drive: 8454.'

in [src > tape_drivers > linux > sg > sg_tape.c]
I think the Function [is_encryption_capable] is not work properly.
maybe '!' missing in if statement

if (IS_LTO(priv->drive_type)) {
ltfsmsg(LTFS_ERR, 30243E, priv->drive_type);
return -EDEV_INTERNAL_ERROR;
}

[Nyosy]

or Does only the Jaguar tape drive support encryption?

[piste-jp]

Sorry the code might not be understandable. It looks encryption might work on both drive, LTO and Jaguar (only under T10 mode).

The backends below only allow LTO.

• cam (FreeBSD)
• lintape (Linux, obsoleted)

On the other hand, the backends below only Jaguar.

• sg (Linux)
• scsipi (NetBSD)
• iokit (MacOS)

[piste-jp]

I would like to make one more comment.

In the tape world, we have 4 basic encryption mode.

• None
• AME (Application Managed Encryption, by application itself)
• SME (System Managed Encryption, by tape driver)
• LME (Library Managed Encryption, by tape library)

In SME and LME, driver or library would fetch encryption key from a key server. So you need to import your key to a key server if you want to keep accessing the tape after you ingest the tape into a library. But I don't know Such kind of key server is existing or not.

Long story short, I never recommend to use encryption on SDE environment if you want to have a kind of access compatibility.

I think that's why the code in this area is remaining as a kind of "MONSTER".