Nintendo Switch Brew

Savegames: Difference between revisions

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The final CMAC key used for this is generated using GenerateAesKek with a kek source and the device key, along with and LoadAesKey and a set key seed.
The final CMAC key used for this is generated using GenerateAesKek with a kek source and the device key, along with and LoadAesKey and a set key seed.


==== DISF ====
=== DISF ===


This section contains information about the structure of the save file.
This section contains information about the structure of the save file.
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|}
|}


==== DPFS ====
=== Duplex header ===


* This is located @ 0x300 in the image, following DISF.
* Block sizes are stored as powers of 2
* Block sizes are log2


{| class="wikitable"
{| class="wikitable"
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| 0x08
| 0x08
| 8
| 8
| Offset 0
| Master bitmap offset
|-
|-
| 0x10
| 0x10
| 8
| 8
| Size 0
| Master bitmap size
|-
|-
| 0x18
| 0x18
| 4
| 4
| Block Size 0, in log 2
| Master bitmap block size power
|-
|-
| 0x1C
| 0x1C
| 8
| 8
| Offset 1
| Level 1 offset
|-
|-
| 0x24
| 0x24
| 8
| 8
| Size 1
| Level 1 size
|-
|-
| 0x2C
| 0x2C
| 4
| 4
| Block Size 1, in log 2
| Level 1 block size power
|-
|-
| 0x30
| 0x30
| 8
| 8
| Offset 2
| Level 2 offset
|-
|-
| 0x38
| 0x38
| 8
| 8
| Size 2
| Level 2 size
|-
|-
| 0x40
| 0x40
| 4
| 4
| Block Size 2, in log 2
| Level 2 block size power
|-
|-
|}
|}


==== IVFC ====
=== Integrity verification header ===


* Generally follows DPFS, similar to 3DS.
* Offsets for levels 1-3 come from the metadata remap storage
* Offsets for level 4 comes from the main data remap storage
* This is the same header used in NCA files


{| class="wikitable"
{| class="wikitable"
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|-
|-
| 0x08
| 0x08
| 8
| Master hash size?
|-
| 0x10
| 8
| Level 1 offset
|-
| 0x18
| 8
| Level 1 size
|-
| 0x20
| 4
| 4
| Level 1 block size, in log2
| Master hash size
|-
|-
| 0x24
| 0xC
| 4
| 4
| Reserved
| Number of levels (Unused in save files)
|-
|-
| 0x28
| 0x10
| 8
| 0x18*6
| Level 2 offset
| Level information for up to 6 levels
|-
|-
| 0x30
| 0xA0
| 8
| 32
| Level 2 size
| Salt seed
|-
|-
| 0x38
|}
| 4
 
| Level 2 block size, in log2.
==== Level information ====
 
* 0x18 bytes long
* Block sizes are stored as powers of 2
 
{| class="wikitable"
|-
|-
| 0x3C
! Start
| 4
! Length
| Reserved
! Description
|-
|-
| 0x40
| 0x00
| 8
| 8
| Level 3 offset
| Offset
|-
|-
| 0x48
| 0x08
| 8
| 8
| Level 3 size
| Size
|-
|-
| 0x50
| 0x10
| 4
| 4
| Level 3 block size, in log2.
| Block size power
|-
|-
| 0x54
| 0x14
| 4
| 4
| Reserved
| Reserved
|-
| 0x58
| 8
| Level 4 offset
|-
| 0x60
| 8
| Level 4 size
|-
| 0x68
| 4
| Level 4 block size, in log2.
|-
| 0x6C
| 4
| Reserved
|-
| 0x70
| 48
| Unknown, reserved?
|-
| 0xA0
| 32
| Hash
|-
|-
|}
|}


==== JNGL ====
=== Journal header ===
 
* Generally follows IVFC


{| class="wikitable"
{| class="wikitable"
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| 0x04
| 0x04
| 4
| 4
| Magic Number (0x10000)
| Magic Number (0x10000 or less)
|-
|-
| 0x08
| 0x08
| 8
| 8
| Savedata Size
| Total size (Incl. journal)
|-
|-
| 0x10
| 0x10
| 8
| 8
| Unknown, Size
| Journal size
|-
|-
| 0x18
| 0x18
| 8
| 8
| Savedata Blocksize?
| Block size
|-
|-
| 0x20
| 0x20
| 4
| 4
| Unknown
| Unknown (Must be 0 or 1)
|-
|-
| 0x24
| 0x24
| 4
| 4
| Unknown
| Main data block count
|-
|-
| 0x28
| 0x28
| 8
| 8
| Unknown
| Journal block count
|-
|-
| 0x30
| 0x200
| 464
|  
| Padding?
| End
|-
|-
|}
|}


==== SAVE ====
=== Save FS header ===


* Generally follows JNGL, structure is different from 3DS.
* Structure is different than 3DS.


{| class="wikitable"
{| class="wikitable"
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| 0x08
| 0x08
| 8
| 8
| Unknown, number
| Number of blocks. Does not change if save file is resized.
|-
|-
| 0x10
| 0x10
| 8
| 8
| Unknown, block size
| Block Size
|-
|
|
| The below fields are read separately from the above fields
|-
|-
| 0x18
| 0x18
| 8
| 8
| Unknown, block size
| Block size
|-
|-
| 0x20
| 0x20
| 8
| 8
| Unknown
| FAT offset
|-
| 0x28
| 4
| FAT entry count
|-
| 0x2C
| 4
| Padding
|-
| 0x30
| 8
| Data offset
|-
| 0x38
| 4
| Data block count
|-
| 0x3C
| 4
| Padding
|-
| 0x40
| 8
| Directory table block index
|-
| 0x48
| 8
| File table block index
|-
|-
|}
|}


==== RMAP ====
=== RMAP ===


* There are generally two RMAP blocks in sequence.
* There are generally two RMAP blocks in sequence.
Retrieved from "https://switchbrew.org/wiki/Savegames"