Nn idbe.rpl

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nn_idbe.rpl is a library that downloads and decrypts icon databases.

Addresses

The library can downloads icons for Wii U or 3DS titles.

For Wii U icons,

https://idbe-wup.cdn.nintendo.net/icondata/%02X/%016llX-%d.idbe

Replace %02X with the first two digits of the second half of the title ID (passing in 10 works fine) and %016llX with the 16-digit title ID. the last %d is the version number.

If you just want the latest icon, you can also use

https://idbe-wup.cdn.nintendo.net/icondata/%02X/%016llX.idbe

e.g. the icon for Splatoon is https://idbe-wup.cdn.nintendo.net/icondata/10/0005000010176A00.idbe

For 3DS icons:

https://idbe-ctr.cdn.nintendo.net/icondata/%02X/%016llX-%d.idbe

or

https://idbe-ctr.cdn.nintendo.net/icondata/%02X/%016llX.idbe

for latest.

These sites use a self-signed SSL certificate, but do allow access without special client certificates (i.e. accessible from a regular browser)

Encryption

nn_idbe contains hardcoded keys in one 0x50 sized block (0x10 * 5), consisting of the 16-byte hardcoded IV, and 4 hardcoded 16-byte AES-128 keys.

In OSv12 (000500101000400A), the keys are located at $.rodata+0x4c of nn_idbe.rpl.

Here are the keys: (no copyright issue as OSv12 is a free title Kappa)

IV = "A46987AE47D82BB4FA8ABC0450285FA4" 

K0 = "4AB9A40E146975A84BB1B4F3ECEFC47B" 
K1 = "90A0BB1E0E864AE87D13A6A03D28C9B8" 
K2 = "FFBB57C14E98EC6975B384FCF40786B5" 
K3 = "80923799B41F36A6A75FB8B48C95F66F" 

AES_KEYS = [K0, K1, K2, K3]

Icon format

Encrypted

Offset Length Description
0x0 0x1 Always 0
0x1 0x1 AES key index
0x2 Remainder Encrypted file contents

Decrypted

Offset Length Description
0x0 0x20 SHA256 hash of the rest of the data
0x20 0x8 Title ID
0x28 0x18 Unknown (See note 1 below)
0x40 0x4 Magic (ÀÀÀÀ)
0x44 0xC Padding?
0x50 0x200*16 Title Info (See note 2 below)
0x2050 Remainder Original TGA

Title Info

Offset Length Description
0x0 0x80 Short title name
0x80 0x100 Full title name
0x180 0x80 Publisher

Note 1: The first 8 bytes of this section seem to always be relatively empty, where as the last 16 seem to always been some combination of the characters € and À.

Examples:

  1. Breath of The Wild: https://i.imgur.com/qI9ehUQ.png
  2. Super Mario Maker: https://i.imgur.com/lNfcAM5.png
  3. Tekken Tag Tournament 2: https://i.imgur.com/8bJeD56.png
  4. Minecraft WiiU: https://i.imgur.com/fiC840J.png


Note 2: Each of the 16 0x200-length groups has 3 UTF-16-BE text blocks. There is always 3 blocks, even if the string does not take up the entire (or any of the) block. Each group is for a different language/region. The first group is for Japanese, the order of the other languages is unknown.

Examples:

  1. New SUPER MARIO BROS. U + New SUPER LUIGI U: https://i.imgur.com/IeAAKuZ.png
  2. Super Mario Maker: https://i.imgur.com/Q6yWYiO.png
  3. Tekken Tag Tournament 2: https://i.imgur.com/f4ENuT5.png
  4. Minecraft WiiU: https://i.imgur.com/xZPCbdQ.png


Example decryptor here: https://github.com/NexoDevelopment/idbe_decrypt/