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Technical Details: FreeOTFE Critical Data Block (CDB) Layout (CDB Format ID 4)

CDB layout format 4 is identical to CDB layout format 3, with the one exception that the Master key stored within the Volume details block may include multiple keys, one after the other

For example:
  • An LRW encrypted volume's "Master key" will be the encryption key, followed immediately by the tweak key.
  • An XTS encrypted volume's "Master key" will be the two XTS encryption keys, one after the other
In all cases, the Master key length will indicate the total length of all keys. It is the responsibility of the cypher driver to determine how the key material is used.

FreeOTFE v3.0 (and later) and FreeOTFE4PDA v3.0 (and later) create volumes using this layout.