DISA and DIFF - Revision history

TimmSkiller: /* DISA Header structure */

2025-06-30T22:01:50Z

DISA Header structure

← Older revision		Revision as of 02:01, 1 July 2025
Line 320:		Line 320:
	\| 0x69		\| 0x69
	\| 1		\| 1
	\| Number of used [[Anti_Savegame_Restore\|Save Data Secure Value]] entries in the DISA header ~~(only for gamecard saves)~~		\| Number of used [[Anti_Savegame_Restore\|Save Data Secure Value]] entries in the DISA header
	\|-		\|-
	\| 0x6A		\| 0x6A
Line 332:		Line 332:
	\| 0x8C		\| 0x8C
	\| 0x30 (0xC * 0x4)		\| 0x30 (0xC * 0x4)
	\| [[DISA_and_DIFF#SaveDataSecureValue\|Save Data Secure Value]] entries (4~~) (only for gamecard saves~~)		\| [[DISA_and_DIFF#SaveDataSecureValue\|Save Data Secure Value]] entries (4)
	\|-		\|-
	\| 0xBC		\| 0xBC
	\| 0x8		\| 0x8
	\| Unused randomly generated u64 value. ~~(only for gamecard saves)~~		\| Unused randomly generated u64 value.
	\|-		\|-
	\| 0xC4		\| 0xC4

2025-06-30T20:48:20Z

DISA Header structure

← Older revision		Revision as of 00:48, 1 July 2025
Line 320:		Line 320:
	\| 0x69		\| 0x69
	\| 1		\| 1
	\| Number of used [[Anti_Savegame_Restore\|Save Data Secure Value]] entries in the DISA header		\| Number of used [[Anti_Savegame_Restore\|Save Data Secure Value]] entries in the DISA header (only for gamecard saves)
	\|-		\|-
	\| 0x6A		\| 0x6A
Line 332:		Line 332:
	\| 0x8C		\| 0x8C
	\| 0x30 (0xC * 0x4)		\| 0x30 (0xC * 0x4)
	\| [[DISA_and_DIFF#SaveDataSecureValue\|Save Data Secure Value]] entries (4)		\| [[DISA_and_DIFF#SaveDataSecureValue\|Save Data Secure Value]] entries (4) (only for gamecard saves)
	\|-		\|-
	\| 0xBC		\| 0xBC
	\| ~~0x44~~		\| 0x8
			\| Unused randomly generated u64 value. (only for gamecard saves)
			\|-
			\| 0xC4
			\| 0x3C
	\| Unused		\| Unused
	\|}		\|}

2025-06-30T19:21:16Z

Add SaveDataSecureValue struct

← Older revision		Revision as of 23:21, 30 June 2025
Line 238:		Line 238:
	=== DISA header ===		=== DISA header ===

			==== SaveDataSecureValue ====
			{\| class="wikitable" border="1"
			\|-
			! Offset !! Length !! Description
			\|-
			\| 0x0 \|\| 0x4 \|\| u32, [[Anti_Savegame_Restore\|Secure Value]] slot
			\|-
			\| 0x4 \|\| 0x8 \|\| u64, [[Anti_Savegame_Restore\|Secure Value]]
			\|}

			==== DISA Header structure ====
	{\| class="wikitable" border="1"		{\| class="wikitable" border="1"
	! Offset		! Offset
Line 321:		Line 332:
	\| 0x8C		\| 0x8C
	\| 0x30 (0xC * 0x4)		\| 0x30 (0xC * 0x4)
	\| [[SaveDataSecureValue\|Save Data Secure Value]] entries (4)		\| [[DISA_and_DIFF#SaveDataSecureValue\|Save Data Secure Value]] entries (4)
	\|-		\|-
	\| 0xBC		\| 0xBC

2025-06-30T19:18:21Z

added Secure Value fields to DISA header structure

← Older revision		Revision as of 23:18, 30 June 2025
Line 308:		Line 308:
	\|-		\|-
	\| 0x69		\| 0x69
	\| 3		\| 1
			\| Number of used [[Anti_Savegame_Restore\|Save Data Secure Value]] entries in the DISA header
			\|-
			\| 0x6A
			\| 2
	\| Padding		\| Padding
	\|-		\|-
Line 316:		Line 320:
	\|-		\|-
	\| 0x8C		\| 0x8C
	\| ~~0x74~~		\| 0x30 (0xC * 0x4)
			\| [[SaveDataSecureValue\|Save Data Secure Value]] entries (4)
			\|-
			\| 0xBC
			\| 0x44
	\| Unused		\| Unused
	\|}		\|}

2020-01-02T05:21:18Z

Summary diagram

← Older revision		Revision as of 08:21, 2 January 2020
Line 688:		Line 688:
	== Summary diagram ==		== Summary diagram ==

			[[File:Disa-diff.png]]
	~~external link~~: ~~https://i.imgur.com/BjwShJZ~~.png
	* Please move this into 3dbrew when file uploading is fixed.

2019-12-22T18:12:17Z

AES CMAC: Explicitly shows the nested hash block format

← Older revision		Revision as of 21:12, 22 December 2019
Line 103:		Line 103:
	\| 0x20		\| 0x20
	\| SHA-256 of the following 0x108-byte block		\| SHA-256 of the following 0x108-byte block
	\|-		{\| class="wikitable" border="1"
	\|		! Offset
			! Length
	\|		! Description

	\|

	\|-		\|-
	\| 0x00		\| 0x00
Line 118:		Line 115:
	\| 0x100		\| 0x100
	\| Copy of the DISA header		\| Copy of the DISA header
			\|}
	\|}		\|}

Line 140:		Line 138:
	\| 0x20		\| 0x20
	\| SHA-256 of the following 0x108-byte block		\| SHA-256 of the following 0x108-byte block
	\|-		{\| class="wikitable" border="1"
	\|		! Offset
			! Length
	\|		! Description

	\|

	\|-		\|-
	\| 0x00		\| 0x00
Line 156:		Line 151:
	\| Copy of the DISA header		\| Copy of the DISA header
	\|}		\|}
			\|}


	=== CTR-SYS0 ===		=== CTR-SYS0 ===

2019-10-25T19:18:27Z

Correct CMAC for cart save

← Older revision		Revision as of 23:18, 25 October 2019
Line 17:		Line 17:
	\| Gamecard		\| Gamecard
	\| DISA		\| DISA
	\| [[#CTR-~~SAV0~~\|CTR-~~SAV0~~]]		\| [[#CTR-NOR0\|CTR-NOR0]]
	\| 0x19		\| 0x19 / 0x33
	\|-		\|-
	\| [[Savegames]]		\| [[Savegames]]
Line 87:		Line 87:
	The data being authenticated by the AES CMAC is a 0x20-byte SHA-256 hash of a data block. The data block has different content formats among CMAC types. All types of data block contain a copy or a hash of the header, which is the start of the the rest of the verification chain, so the AES CMAC effectively authenticates the whole save image. Each type of data block is explained below.		The data being authenticated by the AES CMAC is a 0x20-byte SHA-256 hash of a data block. The data block has different content formats among CMAC types. All types of data block contain a copy or a hash of the header, which is the start of the the rest of the verification chain, so the AES CMAC effectively authenticates the whole save image. Each type of data block is explained below.

	=== CTR-~~SAV0~~ ===		=== CTR-NOR0 ===

	This CMAC type is used for gamecard savegames. It is 0x28-byte long.		This CMAC type is used for gamecard savegames. It is 0x28-byte long.
Line 98:		Line 98:
	\| 0x00		\| 0x00
	\| 8		\| 8
	\| Magic "CTR-~~SAV0~~"		\| Magic "CTR-NOR0"
	\|-		\|-
	\| 0x8		\| 0x8
Line 113:		Line 113:
	\| 0x00		\| 0x00
	\| 8		\| 8
	\| Magic "CTR-~~NOR0~~"		\| Magic "CTR-SAV0"
	\|-		\|-
	\| 0x08		\| 0x08

2019-05-26T13:35:47Z

Partition table & partition descriptor: The padding doesn't actually belongs to the descriptor, according to the descriptor size in the header

2018-01-22T10:35:50Z

IVFC descriptor: fix padding

2018-01-02T14:56:17Z

← Older revision		Revision as of 17:56, 2 January 2018
Line 685:		Line 685:
	* In the partition table, each descriptor verifies level 1 of its IVFC tree via the master hash.		* In the partition table, each descriptor verifies level 1 of its IVFC tree via the master hash.
	* Each IVFC level verifies the next level, until the level 4, which is the inner content.		* Each IVFC level verifies the next level, until the level 4, which is the inner content.

			== Summary diagram ==


			external link: https://i.imgur.com/BjwShJZ.png
			* Please move this into 3dbrew when file uploading is fixed.