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Western Digital Hard Disk Drive OEM Specification
The NIST SP800-38F key wrap algorithm is used to encrypt a key with another key (KEK= Key Encryption Key). For
any band i, the KEK_i is derived from PIN_i and salt_i using the NIST 800-132 algorithm. The KEK_i is then used to
wrap a band’s encryption key.
9.21.4.5
Key Erasure
Cryptographic erase procedure
Erase and overwrite wrapped key material with 0x00.
Erase and store the new wrapped key material.
9.21.5
TCG Enterprise SSC Tables
Two copies of all TCG Enterprise SSC tables and data structures are stored in the RID; one is used as a primary
copy and the other as a backup copy. The backup copy is used in the event the primary copy becomes corrupted.
Each time a write is executed to any TCG table, both the primary and backup copies of the tables are updated and
saved in the RID. In the case of a corrupted copy, the good copy is always used to restore the corrupted copy to
the correct state. If both copies of the tables become corrupted during operation, the tables will be reinitialized to
default values automatically, and this will result in a key mismatch error when a read is attempted.
The default values in the TCG tables created at the time of manufacturing are per the TCG Enterprise SSC
specification. The following tables contain VU (Vendor Unique) entries, which are set at the time of manufacturing.
‘Admin SP’ C_PIN table
‘Locking SP’ C_PIN table
K_AES_256 table
‘Locking SP’ Locking Access Control table
‘Locking Info’ Table
‘Locking SP’ Locking Table
The VU entries for these tables are specified below. In addition, explanation of default values is given for non-VU
entries that require it.
9.21.5.1
‘Admin SP’ C_PIN and ‘Locking SP’ C_PIN Tables
Per TCG Enterprise SSC specification, the PIN is set to the MSID at manufacturing time. WDC has specified the
MSID to be the serial number of the drive concatenated 4x. Try Limit is set to 0, meaning that there is no limit. Tries
is set 0, meaning that there have been no fail attempts. Persistence is set to 0, meaning the “Tries” value does not
persist through power cycles (The “Tries” value is reset to 0 after successful attempt or a power cycle).
PIN
Try Limit
Tries
Persistence
SID
0
0
0
MSID
0
0
0
Table 76 WDC
Default Values for ‘Admin SP’ C_PIN & ‘Locking SP’ C_PIN