PUP
PUP files are update archives for the Vita.
PUP Structure
A good resource on the PUP structure can be found HERE.
Update .PKG files
Most of the files in the update PUP are .pkg files, a sort of Certified File.
Each component of the update is broken up into multiple parts, then optionally compressed, and finally encrypted into the PKG.
Package Header
Right after the Certified File header (usually at offset 0x400) is the update package header that provides information for piecing the component back together. The contents of this header is as follows:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | Version (0x4) |
| 0x4 | 0x4 | Type ID |
| 0x8 | 0x4 | Flags |
| 0xC | 0x4 | ? |
| 0x10 | 0x8 | Update FW Version |
| 0x18 | 0x8 | Final (decompressed) size |
| 0x20 | 0x8 | Decrypted size |
| 0x28 | 0x8 | ? |
| 0x30 | 0x4 | ? |
| 0x34 | 0x4 | ? |
| 0x38 | 0xC | ? |
| 0x3C | 0x4 | ? |
| 0x40 | 0x8 | ? |
| 0x48 | 0x8 | ? |
| 0x50 | 0x8 | Offset |
| 0x58 | 0x8 | Size |
| 0x60 | 0x8 | Part Index |
| 0x68 | 0x8 | Total Parts |
| 0x70 | 0x8 | ? |
| 0x78 | 0x8 | ? |
Flags
There are flags that are set in the package header. Some potential ones are listed here.
| Flag | Description |
|---|---|
| 0x10 | Set when compressed |
| 0x2 | Has multiple parts |
| 0x1 | Set when compressed |
Type ID
The type id determines which decryption routine to use in SceSblSsUpdateMgr. There is a truth table to determine which id can be handled by which decryption function. To see how this table is used, check out the example code for decrypting packages.
| Type ID | Func 1? | Func 2? | Func 3? |
|---|---|---|---|
| 0x0 | No | No | No |
| 0x1 | Yes | Yes | No |
| 0x2 | No | No | No |
| 0x3 | No | No | Yes |
| 0x4 | No | No | Yes |
| 0x5 | No | No | No |
| 0x6 | No | No | No |
| 0x7 | No | No | No |
| 0x8 | Yes | Yes | No |
| 0x9 | Yes | Yes | No |
| 0xA | Yes | Yes | Yes |
| 0xB | Yes | Yes | No |
| 0xC | Yes | Yes | No |
| 0xD | Yes | Yes | No |
| 0xE | No | No | No |
| 0xF | Yes | Yes | No |
| 0x10 | Yes | Yes | No |
| 0x11 | Yes | Yes | No |
| 0x12 | Yes | Yes | No |
| 0x13 | Yes | Yes | No |
| 0x14 | Yes | Yes | No |
| 0x15 | Yes | Yes | Yes |
| 0x16 | Yes | Yes | Yes |
| 0x17 | Yes | Yes | Yes |
| 0x18 | Yes | Yes | No |
| 0x19 | Yes | Yes | No |
| 0x1A | No | No | No |
| 0x1B | No | No | Yes |
Type ID (Identifier)
The type ID is also used to identify the component of the update.
| Type ID | Note |
|---|---|
| 0x0 | |
| 0x1 | os0 partition
|
| 0x2 | |
| 0x3 | |
| 0x4 | Permissions related to TAR archives of type 0x16 |
| 0x5 | |
| 0x6 | |
| 0x7 | |
| 0x8 | Syscon Update (0x9A54 type) |
| 0x9 | SLB2 bootloaders |
| 0xA | vs0 partition
|
| 0xB | Development CP firmware (same file as PUP entry 0x2006) |
| 0xC | Motion related |
| 0xD | Bbmc related |
| 0xE | |
| 0xF | Motion related |
| 0x10 | Touch/Syscon related |
| 0x11 | Touch related |
| 0x12 | Syscon related |
| 0x13 | Syscon related |
| 0x14 | Syscon Update (0x3665 type) |
| 0x15 | |
| 0x16 | TAR archive, patch update for vs0
|
| 0x17 | sa0 partition
|
| 0x18 | pd0 partition
|
| 0x19 | Syscon Update (0xC5E7 type) |
| 0x1A | |
| 0x1B | PSP Emulator lists |
SCEWM
Header
This is a watermark for PUPs. For development PUPs, the Issue ID is unique to the company/organization the PUP is issued to.
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x6 | Magic "SCEWM\0" |
| 0x6 | 0x2 | ?Version? (ex: 00 01) |
| 0x8 | 0x4 | Unknown (ex: 01 00 00 00) |
| 0xC | 0x4 | Content size including RSA area (ex: 0x1000) |
| 0x10 | 0x4 | Issue ID (ex: 0xD9) |
| 0x14 | 0x4 | Unknown (ex: 01 00 00 00) |
| 0x18 | 0x4 | Unknown (ex: 01 00 00 00) |
| 0x1C | 0x4 | Unknown (ex: 01 00 00 00) |
The Issue ID for SCE/retail PUPs seems to be 0x5A.
Content
The encrypted SCEWM file is composed of 3 parts:
- header: size 0x20 bytes.
- RSA signature of the PUP regardless of the watermark: size 0x100 bytes.
- SCEWM unique data per issue ID: size 0x900 bytes (may vary, check SCEWM header).
Security
When comparing same PUP signed for two different issue IDs, we can notice only 2 differences:
- the issue ID in SCEWM header
- the SCEWM unique data