Mii Maker

Mii Maker lets you create Miis, and is the successor of the Wii's Mii Channel.

It can transfer Miis over local wireless from other systems running Mii Maker (3DS/Wii U), or receive, but not send, from Mii Channel.

Wii Mii Channel transfer protocol

The Wii beacons are similar to the usual multi-cart NDS beacons, except: beacon_type is zero, and payload size is 0x14. The payload data is just the Wii UTF-16 nickname, with some extra unused zero data. The usual multi-cast NDS protocol is used for sending the 3DS nick to the Wii. After many keep-alive frames, it eventually sends a bunch of frames, each containing the whole Mii. There's a 6-byte header, followed by Mii data. At the end of these frames like most NDS frames is the 0200 byte marker.

Mii QR Code format

3DS Mii QR is a standard 57x57 pixel Level 10 High ECC QR code with 'Mii' logo in center (refer to Denso-Wave Inc web site for QR Code format specifications). It contains 0x70-bytes of binary data. 3DS seems to have a fully implemented QR-code decoder, as it can interpret such Mii binary data being encoded even in the smallest possible for that data size Level 6 Low ECC QR code.

The data itself is encrypted with AES-CCM, xorpads can be determined from known plaintext here. The Mii Maker application uses the NS APT Wrap/Unwrap commands to encrypt/decrypt this Mii data. For the NS Unwrap command, the Mii Maker application uses nonceoffset=12, noncesize=10, and inputbuffer-size=0x60. Note that the actual nonce size is 8 bytes due to Wrap/Unwrap implementation, and the nonce data should be moved 12 bytes afterwards after decryption. The rest of the data at 0x8-0x5F is encrypted, and should be split into two parts after decryption, with the nonce data in the middle. (See Wrap and Unwrap for more information)

Offset	Length
0x0	0x4	Mii ID (big-endian 32-bit unsigned integer) The most significant 3 bits determine whether the Mii is Special, Foreign, or Normal [1] time_offset = (mii_id & 0x0FFFFFFF) * 2; time_offset is the time the Mii was created, represented as the number of seconds since 01/01/2010 00:00:00
0x4	0x4	High 4 octets of MAC address [2]
0x8	0x4	Mii ID, the encrypted data begins here.
0xC	0x8	System ID
0x14	0x2	Low 2 octets of MAC address
0x16	0x2	padding (0000)
0x18	0x2	Bit-mapped: Birthday (4bit-day,5bit-month), Sex, Shirt, ??
0x1A	0x14	UTF-16 Mii Name (10 chars max)
0x2E	0x2	width & height
0x30	0x1	bit 0: disable sharing bit 1-4: face shape bit 5-7: skin color
0x31	0x1	bit 0-3: wrinkles bit 4-7: makeup
0x32	0x1	hair style
0x33	0x1	bit 0-2: hair color bit 3: flip hair
0x34	0x4	unknown
0x38	0x1	bit 0-4: eyebrow style bit 5-7: eyebrow color
0x39	0x1	bit 0-3: eyebrow scale bit 4-6: eyebrow yscale
0x3A	0x2	note that the bytes are swapped over (little-endian layout) bit 0-3: eyebrow rotation bit 5-8: eyebrow x spacing bit 9-13: eyebrow y position
0x3C	0x1	Allow Copying
0x3D	0x3	unknown
0x40	0x1	Mii Sharing Value
0x41	0x7	unknown
0x48	0x14	UTF-16 Author Name (10 chars max)
0x5C	0x2	unknown
0x5E	0x2	unknown
0x60	0x10	AES-CCM MAC

• QR codes made from the same 3DS for the same Mii are use the same AES-CCM nonce (you can recreate the xorpad by xoring with known values from this table).

Mii Database

Created, received, or even met-in-multiplayer Miis are saved in CFL_DB.dat.

Savedata

editSaveData.bin

Offset	Length
0x0	0x4	"TIDE" header (EDIT byteswapped)
0x4	0x4	zero
0xC	0x4 (?)	01000000 (constant?)
0x100	0x4	Number of scanned Special Mii QRs
0x104	-	Some data identifying each scanned Special Mii QRs, for the purpose of not making them scannable again. 8 or 12 byte each?
0x2904	0x4	Checksum?

ExtData

The ExtData File System for Mii Maker is as follows:

root
├── icon
├── boss
└── user
    └── ExBanner
        └── COMMON.bin

File	Details	Size	FW Introduced	Plaintext
icon	Duplicate from Application ExeFS. Always image 00000002.	0x36c0 Bytes	1.0.0-0	Download
COMMON.bin	Extended Banner for Home Menu. Always image 00000003.	0x20224 Bytes	1.0.0-0	Download