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Extra info for AACS Introduction and Common Cryptographic Elements
The AGID field identifies the Authentication Grant ID that was used for the authentication process. The other fields of the REPORT KEY Command Descriptor Block shall be set as described in the Mt. Fuji specification. 1 Getting Authentication Grant ID for AACS Table 4-7 shows the format of the data returned by the REPORT KEY command when Key Class of 0216 and Key Format of 0000002 are used. Table 4-7 – REPORT KEY Data Format (with Key Format = 0000002, Key Class = 0216) Bit Byte 0 1 2 3 4 5 6 7 7 6 (msb) 5 4 3 2 1 REPORT KEY Data Length (000616) 0 (lsb) Reserved Reserved Reserved Reserved Reserved AGID Reserved This Key Format requests the logical unit to return an Authentication Grant ID for AACS.
If the signature is successfully verified, the host shall replace the previously stored DRL data, if any, with the newly read DRL data. Note that the replacement process need not be performed during the drive authentication procedure but shall be performed before the media is ejected. When persistently storing DRL data, the host shall have at least 32K bytes of non-volatile memory for that purpose. This size is sufficient to store the first signature block of the Drive Revocation List Record. 10 Mt.
91 Page 37 Advanced Access Content System: Introduction and Common Cryptographic Elements 11. Upon receiving the write request the drive writes the encrypted Data associated with the Protected Area (ED), the Binding Nonce, and the association between the two to the media. 2 Protocol for Reading Protected Area Data The Protected Area Data is read by the host using the following procedure. Figure 4-11 shows the protocol flow of reading the Protected Area Data. AACS Optical Drive Host AACS-Auth Request to read Protected Area Data with specifying LBA extent If AACS-Auth successful If AACS-Auth successful Read Binding_Nonce from the media Calculate Dm = CMAC(BK, Binding_Nonce || Starting_LBA) Binding_Nonce || Dm Request to read the encrypted data with specifying the LBA extent Write the encrypted data, Binding_Nonce and the association between the two to the media Calculate Hm = CMAC(BK, Binding_ Nonce || Starting_LBA) Verify Dm == Hm Calculate Kpa = AES-G(Km, Binding_Nonce) Encrypted Data (ED) Decrypt data associated with Protected Area using Kpa Figure 4-11 – Protocol Flow of reading Protected Area Data 1.
AACS Introduction and Common Cryptographic Elements