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Extra resources for AACS Introduction and Common Cryptographic Elements
3. The REPORT KEY Data Length field specifies the length in bytes of the following REPORT KEY data that is available to be transferred to the host. The REPORT KEY Data Length value does not include the REPORT KEY Data Length field itself. For the Key Format of 0000012, the value of this field is 007216. Bytes 4 through 23 return the 160-bit nonce Dn value. 1. When the loaded disc is not AACS compliant media, this command with Key Format = 0000012 shall be terminated with CHECK CONDITION Status, 5/6F/01 COPY PROTECTION KEY EXCHANGE FAILURE – KEY NOT PRESENT.
If not, the host determines to use the DRL in its non-volatile memory for the subsequent drive authentication procedure and go to step 3. 2. If the version of MKB recorded on the media is higher than the version of DRL that the host has stored in its non-volatile memory, the host verifies the signature in the Drive Revocation List Record of MKB. If the signature is correctly verified, the host determines to use the DRL in the MKB for the subsequent drive authentication procedure; otherwise, the host shall abort the drive authentication procedure.
Key Format values defined for AACS are shown in Table 4-6. Table 4-6 – Key Format Code Definition for REPORT KEY command (Key Class = 0216) Key Format 0000002 0000012 0000102 1000002 1000012 1111112 Returned Data AGID for AACS Drive Certificate Challenge Drive Key Binding Nonce Binding Nonce None Description Returns an AUTHENTICATION GRANT ID for Authentication for AACS AGID Use Reserved & N/A Returns a Drive Certificate Challenge Valid AGID required Returns a Drive Key Generates and stores a Binding Nonce and returns it Returns a Binding Nonce Invalidate specified AGID for AACS Valid AGID required Valid AGID required Valid AGID required Valid AGID required The Reserved/Address field contains a value which depends on the value in the Key Format field.