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Extra resources for AACS Introduction and Common Cryptographic Elements
The last MKB Pack may end with unused bytes, which shall be zero-filled. The MEDIA KEY BLOCK Pack Data field returns the requested MKB Pack. The MEDIA KEY BLOCK Pack Data length is 32,768 and the DISC STRUCTURE Data Length is 800216. 4 SEND KEY Command Extensions The SEND KEY command with Key Class 0216 is used for AACS. The SEND KEY command with Key Class 0216 provides data necessary for authentication and for generating a Bus Key and ends the authentication process. 91 Page 48 Advanced Access Content System: Introduction and Common Cryptographic Elements Table 4-18 – SEND KEY Command Bit Byte 0 1 2 3 4 5 6 7 8 9 10 11 7 6 5 4 3 2 1 0 Operation code (A316) Reserved Reserved Reserved Reserved Reserved Reserved Key Class (msb) Parameter List Length AGID Vendor-Specific Reserved Key Format NACA (lsb) Flag Link The Key Format field indicates the type of information that is sent to the logical unit.
However, it is common for proactivelyrenewed devices to find themselves revoked if they are at a down-level version. In this case, the update to the new version should be as seamless as possible for the consumer. The length of this record will always be a multiple of 4 bytes. Thus, there may be unused bytes at the end of the record. 6 Subset-Difference Index Record Table 3-8 – Subset-Difference Index Record Format Bit Byte 0 1 2 3 4 … 7 8 9 10 11 12 13 14 … 7 6 5 4 3 2 1 0 Record Type: 0716 Record Length Span (number of devices) Offset 0 Offset 1 Offsets 2 – Offset N Length-1 This is a speed-up record which can be ignored by devices not wishing to take advantage of it.
AACS Optical Drive Host AACS-Auth Request PMSN If AACS-Auth successful If AACS-Auth successful Read PMSN from the media Calculate Dm = CMAC(BK, PMSN) PMSN || Dm Calculate Hm = CMAC(BK, PMSN) Verify Dm == Hm Figure 4-8 – Protocol Flow of transferring Pre-recorded Media Serial Number 1. 2. 3. 4. 5. 6. 3. If the AACS-Auth procedure is successful, the drive and the host proceed with the remaining steps. 3. Dm = CMAC(BK, PMSN) The drive sends PMSN read in step 3 and the message authentication code Dm calculated in step 3 to the host.
AACS Introduction and Common Cryptographic Elements