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→MAC header
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* to calculate the checksum, a CRC16 of the block (with starting value 0xFFFF) is calculated, and the two bytes of the CRC16 are XORed together to produce the 8bit checksum
* to calculate the checksum, a CRC16 of the block (with starting value 0xFFFF) is calculated, and the two bytes of the CRC16 are XORed together to produce the 8bit checksum
−=== MAC header ===
+=== AES MAC header ===
{| class="wikitable"
{| class="wikitable"
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| 0x00
| 0x00
| 0x10
| 0x10
−| [[AES]]-CBC MAC over a 0x20-byte SHA256 hash
+| [[AES]] MAC over a 0x20-byte SHA256 hash
|-
|-
| 0x10
| 0x10
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|}
|}
−This MAC is used to "sign" the DISA/DIFF header. Each time the savegame is updated the hash stored in the DISA/DIFF is updated, therefore the MAC must be updated each time the save is modified as well. SHA256_Update() is used to calculate the hash with the blocks described below.
+This AES MAC is used to "sign" the DISA/DIFF header. Each time the savegame is updated the hash stored in the DISA/DIFF is updated, therefore the MAC must be updated each time the save is modified as well. SHA256_Update() is used to calculate the hash with the blocks described below.
==== Savegame Types ====
==== Savegame Types ====
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|-
|-
| CTR-9DB0
| CTR-9DB0
−| ?
+| /dbs extdata images
|}
|}
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|-
|-
| 0x4
| 0x4
−| ?
+| ID, value 0x2 for title.db.
|-
|-
| 0x100
| 0x100
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|}
|}
−This is likely used for the [[Title_Database|dbs]] images' MAC.
+This is used for the [[Title_Database|dbs]] images' MAC.
=== Partitions ===
=== Partitions ===