Quantum LTO 4, User Manual

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SCSI Commands: 44BSECURITY PROTOCOL OUT Page 201
Field Bytes Bits Description
Key Descriptor
Type 0 00h = Unauthenticated key-associated data (U-KAD).
Authenticated 1 0-2 Data-out: Reserved (0h)
Data-in:
2h = No attempt has been made to authenticate the value in
the Key Descriptor field.
Key Descriptor
Length
2-3 Length of the Key Descriptor field.
Key Descriptor 4-n Up to 32 bytes of unauthenticated key-associated data.
3.32.3.2 Authenticated Key-Associated Descriptor
In the Ultrium-4 format, A-KAD is up to twelve bytes in length. The A-KAD descriptor
format is shown below.
Byte Bits
7 6 5 4 3 2 1 0
0 Key Descriptor Type (01h)
1 Reserved Authenticated
2 (MSB)
3
Key Descriptor Length (n-3)
(LSB)
4 (MSB)
n
Key Descriptor
(LSB)
3.32.3.2.1 Authenticated Key-Associated Descriptor Field Descriptions
Field Bytes Bits Description
Key Descriptor
Type 0 01h = Authenticated key-associated data (A-KAD).
Authenticated 1 0-2 Data-out: Reserved (0h)
Data-in:
3h = Authenticated key-associated data on the medium was
authenticated.
4h = Authenticated key-associated data on the medium failed
authentication.
Key Descriptor
Length 2-3 Length of the Key Descriptor field.
Key Descriptor 4-n Up to twelve bytes of authenticated key-associated data.
3.32.3.3 Metadata Key-Associated Key Descriptor
•
In the Ultrium-4 format, the metadata key descriptor is 64 bytes in length.
The metadata descriptor format is shown below.
Byte Bits
7 6 5 4 3 2 1 0
0 Key Descriptor Type
1 Reserved Authenticated
2 (MSB)
3
Key Descriptor Length (0040h)
(LSB)