View source for Rumble U NFC Figures

{{about|the Pokémon Rumble U NFC Figures|the later released Amiibo NFC Figures|https://www.3dbrew.org/wiki/Amiibo Amiibo}}

The '''Pokémon Rumble U NFC Figures''' are figures released for use with Pokémon Rumble U. The figures can be scanned using the [[GamePad]]'s NFC sensor.

Internally these figures are version 0 figures, while the later released Amiibo are version 2 figures.

= Tag Information =
* Type: Topaz-512 
* Manufacturer: Several (Broadcom Corporation, Innovision Research and Technology Plc (UK))
* Page size: 8 Bytes
* Page count: 64 (512 Bytes)

= Page layout =
{| class="wikitable" border="1"
|-
!  NFC page
!  Total pages
!  Raw byte offset in EEPROM
!  Total byte size
!  Writable
!  Description
|-
| 0x0
| 0x1
| 0x0
| 0x8
| style="background: red" | No
| 7-byte UID, then 1 reserved byte
|-
| 0x1
| 0x3
| 0x8
| 0x18
| style="background: green" | Yes
| Capability Container, Lock Control TLV, Memory Control TLV, NDEF Message TLV, NDEF Header with TNF 5
|-
| 0x4
| 0x4
| 0x20
| 0x20
| style="background: green" | Yes
| Start of NDEF payload, contains the "unfixed infos" HMAC
|-
| 0x8
| 0x1
| 0x40
| 0x8
| style="background: green" | Yes
| [[#NOFT Info]]
|-
| 0x9
| 0x4
| 0x48
| 0x20
| style="background: green" | Yes
| RW Area (1)
|-
| 0xD
| 0x1
| 0x68
| 0x8
| style="background: red" | No
| Reserved
|-
| 0xE
| 0x1
| 0x70
| 0x8
| style="background: red" | No
| 2 lock bytes locking out pages 0x1, 0xD, 0xE and 0xF, followed by 6 reserved bytes
|-
| 0xF
| 0x1
| 0x78
| 0x8
| style="background: red" | No
| 2 reserved bytes, followed by 6 lock bytes for pages 0x10 - 0x3F (as described by the Lock Control TLV).<br>This defines the locked area by locking out the last 16 pages.
|-
| 0x10
| 0x20
| 0x80
| 0x100
| style="background: green" | Yes
| RW Area (2)
|-
| 0x30
| 0x4
| 0x180
| 0x20
| style="background: red" | No
| Start of the locked area, contains the "locked secret" HMAC
|-
| 0x34
| 0x2
| 0x1A0
| 0x10
| style="background: red" | No
| [[#Area Info|RW Info]]
|-
| 0x36
| 0x2
| 0x1B0
| 0x10
| style="background: red" | No
| [[#Area Info|RO Info]]
|-
| 0x38
| 0x2
| 0x1C0
| 0x10
| style="background: red" | No
| RO Area
|-
| 0x3A
| 0x2
| 0x1D0
| 0x10
| style="background: red" | No
| [[#Format Info]]
|-
| 0x3C
| 0x4
| 0x1E0
| 0x20
| style="background: red" | No
| Key generation salt encrypted using AES-CTR with the NFC key
|}

== Encryption ==
The RW Area is encrypted using AES-CTR. The key and nonce is derived from the key generation salt, the Format Info, the write count in the NOFT Header, and the "unfixed infos" bytes.

RW Info, RO Info and RO Area are also encrypted using AES-CTR. The key and nonce is derived from the key generation salt, the Format Info, and the "locked secret" bytes.

== Internal structure ==
Internally the NDEF payload and locked area are copied to a contiguous buffer. This means the internal buffer starts at page 0x4 and does not include pages 0xD, 0xE and 0xF.

= Data structures =
== NOFT Info ==
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
! Notes
|-
| 0x0
| 0x4
| Magic
| 'NOFT' (0x4E4F4654) magic value
|-
| 0x4
| 0x1
| Version
| Always 1
|-
| 0x5
| 0x2
| Write count
| Incremented before encryption on each write to the RW Area
|-
| 0x7
| 0x1
| Padding/Unused
| 
|}

== Area Info ==
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
! Notes
|-
| 0x0
| 0x2
| Magic/Type
| 'RW' (0x5257) or 'RO' (0x524F) magic
|-
| 0x2
| 0x2
| Offset
| Offset in bytes to the internal buffer
|-
| 0x4
| 0x2
| Size
| The size of the area in bytes
|-
| 0x6
| 0x2
| Padding/Unused
| 
|-
| 0x8
| 0x4
| Maker Code
| This is '0001' (0x30303031) for the Pokémon Rumble U figures
|-
| 0xC
| 0x4
| Identify Code
| This is 'WCN-' (0x57434E2D) for the Pokémon Rumble U figures. This is the Pokémon Rumble U product code.
|}

== Format Info ==
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
! Notes
|-
| 0x0
| 0x2
| RW Info offset
| Offset in bytes to the start of the RW info
|-
| 0x2
| 0x2
| RW Size
| Total RW size, including info and area
|-
| 0x4
| 0x2
| RO Info offset
| Offset in bytes to the start of the RO info
|-
| 0x6
| 0x2
| RO Size
| Total RO size, including info and area
|-
| 0x8
| 0x7
| UID
| Copy of the UID from page 0
|-
| 0xF
| 0x1
| Format Version
| Always 0
|}

= Area structure =
This is the structure of the areas parsed by Pokemon Rumble U.
== RW Area ==
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
! Notes
|-
| 0x0
| 0x4
| Magic 
| 'CVRN' (0x4356524E) magic value. If this magic value isn't set, the RW area is not written yet.
|-
| 0x4
| 0x11C
| 
| Unknown
|}

== RO Area == 
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
! Notes
|-
| 0x0
| 0x1
| 
| Unknown (always 0x01?)
|-
| 0x1
| 0x1
|
|
{| class="wikitable" border="1"
|-
!  Value
!  Description
|-
| 0x00
| Default
|-
| 0x01
| Shiny
|-
| 0x02
| Unknown
|}
|-
| 0x2
| 0x2
| National Pokedex number
| 
|-
| 0x4
| 0x1
| Pokemon variant
| 
|-
| 0x5
| 0x1
| 
| Unknown
|-
| 0x6
| 0x2
| Initial move A
| 
|-
| 0x8
| 0x2
| Initial move B
| 
|-
| 0xA
| 0x1
| Base power level
| 
|-
| 0xB
| 0x1
| Special Trait / Prefix
| 
|-
| 0xC
| 0x4
| 
| Unknown
|}