Difference between revisions of "DSiWare Exports"
Line 48: | Line 48: | ||
| 0x10 | | 0x10 | ||
| 0x10 | | 0x10 | ||
− | | IV, generated by the RNG. | + | | IV, generated by the [[PSPXI:GenerateRandomBytes|RNG]]. |
|} | |} | ||
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| 0x3C + X | | 0x3C + X | ||
| 0x180 | | 0x180 | ||
− | | ECDSA "APXXXXXXXXXXXXXXXX" cert signed by the below [[CTCert]], where X is random lowercase ASCII hex data. | + | | ECDSA "APXXXXXXXXXXXXXXXX" cert signed by the below [[CTCert]], where X is [[PSPXI:GenerateRandomBytes|random]] lowercase ASCII hex data. |
|- | |- | ||
| 0x1BC + X | | 0x1BC + X |
Revision as of 02:14, 26 April 2013
The DSiWare exported from a 3DS is located at "sdmc:/Nintendo 3DS/<ID0>/<ID1>/Nintendo DSiWare". Filenames are same format as DSi: "<TitleID-Low>.bin". The below sizes include the 0x20-byte block metadata.
DSiWare exported from 3DS use console-unique keyslots initialized by movable.sed. Each section is encrypted with AES-CBC.
The content sections are ordered the same way as DSi: TMD, SRL from content0, <content1-7 for format v2>, public.sav, and banner.sav when banner.sav exists. When the DSiWare export type is 7-11, the 12th content section is the private.sav, if it exists.(ContentX here is the .app data from TWL-NAND /title)
DSiWare Export Types
Value | Format version | Description |
---|---|---|
0-6 | Same as value 14. | |
7-11 | v2 | 12 content sections |
12 | v2 | 4 content sections |
13 | v1 | 4 content sections |
14 | v2 | 11 content sections |
For NATIVE_FIRM versions where this DSiWare export type field is unused, format version v1 is used with 4 content sections. Otherwise when this field is used, see the above table. System Settings uses type 1 for exporting DSiWare, regardless of the System Settings title-version.
Block Metadata
Offset | Size | Description |
---|---|---|
0x0 | 0x10 | AES MAC over a SHA-256 hash |
0x10 | 0x10 | IV, generated by the RNG. |
Each section begins with the payload encrypted data, followed by this block metadata. The SHA-256 hash used for the MAC is calculated over the cleartext payload. This hash used for generating the MAC is also stored in the footer.
Offset | Size | Description |
---|---|---|
0x0 | X | SHA-256 hashes over the banner, header, and content sections. When a content section doesn't exist, the corresponding hash here is uninitialized. |
0x0 + X | 0x3C | ECDSA signature over the previous hashes, signed by the APCert. |
0x3C + X | 0x180 | ECDSA "APXXXXXXXXXXXXXXXX" cert signed by the below CTCert, where X is random lowercase ASCII hex data. |
0x1BC + X | 0x180 | ECDSA CTCert |
0x33C + X | 0x4 | Uninitialized padding. |
These hashes are the same hashes used for generating each section's MAC stored in the metadata block. X = 0x40 + totalcontentsections*0x20.
File Structure v1
Offset | Size | Description |
---|---|---|
0x0 | 0x4020 | Banner section |
0x4020 | 0xC0 | Header section |
0x40E0 | 0x340 + 0x20 + X, where X is the total size of the hashes stored in the footer. | Footer section |
0x40E0 + footer_size | Content sections |
Header
Offset | Size | Description |
---|---|---|
0x0 | 0x4 | Magic number 0x54444633, "3FDT". |
0x4 | 0x2 | Byte-swapped groupID from the TWL TMD. |
0x6 | 0x2 | Byte-swapped title version from the TWL TMD. |
0x8 | 0x20 | SHA-256 hash calculated over the encrypted movable.sed. |
0x28 | 0x10 | Encrypted AES block from encrypting an all-zero 0x10-byte block with AES-CBC, where the IV is all-zero. |
0x38 | 0x8 | Byte-swapped titleID from the TWL TMD. |
0x40 | 0x8 | ? |
0x48 | 0x10 | u32 payload sizes for the 4 content sections. |
0x58 | 0x4 | ? |
0x5C | 0x3E | Data from the TWL TMD reserved section. Only the first 0x20-bytes from the TWL TMD is written here, the rest is uninitialized. |
0x9A | 0x6 | Padding? |
File Structure v2
Offset | Size | Description |
---|---|---|
0x0 | 0x4020 | Banner section |
0x4020 | 0x110 | Header section |
0x4130 | 0x340 + 0x20 + X, where X is the total size of the hashes stored in the footer. | Footer section |
0x4130 + footer_size | Content sections |
Header
Offset | Size | Description |
---|---|---|
0x0 | 0x4 | Magic number 0x54444633, "3FDT". |
0x4 | 0x2 | Byte-swapped groupID from the TWL TMD. |
0x6 | 0x2 | Byte-swapped title version from the TWL TMD. |
0x8 | 0x20 | SHA-256 hash calculated over the encrypted movable.sed. |
0x28 | 0x10 | Encrypted AES block from encrypting an all-zero 0x10-byte block with AES-CBC, where the IV is all-zero. |
0x38 | 0x8 | Byte-swapped titleID from the TWL TMD. |
0x40 | 0x8 | ? |
0x48 | 0x2C | u32 payload sizes for the 11 content sections. |
0x74 | 0x30 | ? |
0xA4 | 0x3E | Data from the TWL TMD reserved section. Only the first 0x20-bytes from the TWL TMD is written here, the rest is uninitialized. |
0xE2 | 0x0E | Padding? |