242
edits
Changes
→Summary diagram
| Gamecard
| Gamecard
| DISA
| DISA
| [[#CTR-SAV0|CTR-SAV0]]
| [[#CTR-NOR0|CTR-NOR0]]
| 0x19
| 0x19 / 0x33
|-
|-
| [[Savegames]]
| [[Savegames]]
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.
| 0x00
| 0x00
| 8
| 8
| Magic "CTR-SAV0"
| Magic "CTR-NOR0"
|-
|-
| 0x8
| 0x8
| 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
| 8
| 8
| Magic "CTR-NOR0"
| Magic "CTR-SAV0"
|-
|-
| 0x08
| 0x08
| 0x100
| 0x100
| Copy of the DISA header
| Copy of the DISA header
|}
|}
|}
| 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
| 0x100
| 0x100
| Copy of the DISA header
| Copy of the DISA header
|}
|}
|}
=== CTR-SYS0 ===
=== CTR-SYS0 ===
== Summary diagram ==
== Summary diagram ==
[[File:Disa-diff.png]]