SMM 2 Level Files

SMM 2 > Level Files

All level files have the same size in Super Mario Maker 2:

Offset	Size	Description
0x0	0x10	File header
0x10	0x5BFC0	File body (encrypted)
0x5BFD0	0x30	Crypto parameters

Encryption

The file body is encrypted with AES-CBC. The following structure is stored at the end of the level file:

Offset	Size	Description
0x0	16	Initialization vector
0x10	4 x 4	Random number generator state
0x20	16	AES-CMAC of decrypted data

The ENL key generation algorithm is used to generate the keys. However, instead of initializing the random number generator by seed, its internal state is initialized directly with the values from the structure above. Two keys are generated (with the same random number generator):

1. A 16-byte key to decrypt the file body
2. A 16-byte key to calculate or verify the CMAC

The following integer table is passed to the key generation algorithm:

table = [
	0x7AB1C9D2, 0xCA750936, 0x3003E59C, 0xF261014B,
	0x2E25160A, 0xED614811, 0xF1AC6240, 0xD59272CD,
	0xF38549BF, 0x6CF5B327, 0xDA4DB82A, 0x820C435A,
	0xC95609BA, 0x19BE08B0, 0x738E2B81, 0xED3C349A,
	0x045275D1, 0xE0A73635, 0x1DEBF4DA, 0x9924B0DE,
	0x6A1FC367, 0x71970467, 0xFC55ABEB, 0x368D7489,
	0x0CC97D1D, 0x17CC441E, 0x3528D152, 0xD0129B53,
	0xE12A69E9, 0x13D1BDB7, 0x32EAA9ED, 0x42F41D1B,
	0xAEA5F51F, 0x42C5D23C, 0x7CC742ED, 0x723BA5F9,
	0xDE5B99E3, 0x2C0055A4, 0xC38807B4, 0x4C099B61,
	0xC4E4568E, 0x8C29C901, 0xE13B34AC, 0xE7C3F212,
	0xB67EF941, 0x08038965, 0x8AFD1E6A, 0x8E5341A3,
	0xA4C61107, 0xFBAF1418, 0x9B05EF64, 0x3C91734E,
	0x82EC6646, 0xFB19F33E, 0x3BDE6FE2, 0x17A84CCA,
	0xCCDF0CE9, 0x50E4135C, 0xFF2658B2, 0x3780F156,
	0x7D8F5D68, 0x517CBED1, 0x1FCDDF0D, 0x77A58C94
]

File Header

The header is not encrypted.

Offset	Size	Description
0x0	4	Always 1
0x4	2	Always 16
0x6	2	Always 1
0x8	4	CRC32 of decrypted file body
0xC	4	Magic number (always SCDL)

File Body

Offset	Size	Description
0x0	0x200	Course metadata
0x200	0x2DEE0	Unknown
0x2E0E0	0x2DEE0	Unknown

Course Metadata

Offset	Size	Description
0x0	4	Unknown
0x4	2	Time limit
0x6	2	Unknown
0x8	2	Creation year
0xA	1	Creation month
0xB	1	Creation day
0xC	1	Creation hour
0xD	1	Creation minute
0xE	2	Unknown
0x10	4	Unknown
0x14	4	Unknown
0x18	8	Unknown
0x20	4	Unknown
0x24	4	Random number seed
0x28	0xC0	Unknown
0xF0	1	Unknown
0xF1	3	Unknown
0xF4	0x20	Level name (utf16)
0x114	0xEC	Unknown