SLB2
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SLB2 is the format used to store the encrypted bootloaders on the device.
Structure
See [SLB2 structure]
SLB2 embedded ENC Files in PUP SPKG
On 3.50 reset, 3.60 retail:
- second_loader.enc, size: 0xD400 bytes
- second_loader.enp, size: 0xD400 bytes
- secure_kernel.enc, size: 0x8400 bytes
- secure_kernel.enp, size: 0x8400 bytes
SLB2 embedded ENC Files on PSVita eMMC
On 3.50 reset, 3.60 retail:
- second_loader.enp_, size: 0xD400 bytes
- second_loader.enp, size: 0xD400 bytes
- secure_kernel.enp_, size: 0x8400 bytes
- secure_kernel.enp, size: 0x8400 bytes
ENC file structure
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | 0x64B2C8E5 Magic
|
| 0x4 | 0x4 | Data segment location |
| 0x8 | 0x4 | Unknown |
| 0xC | 0x4 | Unknown/Zero |
| 0x10 | 0x4 | Data size |
| 0x14 | 0xC | Unknown |
| 0x20 | 0x20 | Data segment SHA256 |
| 0x40 | 0x10 | System Software version in ASCII (ex: "0000360000000000") |
| 0x50 | 0x90 | Zero |
| 0xE0 | 0x1E0 | Encrypted Header |
The last 0x340 bytes is a footer that likely contains a signed MAC of the plaintext data.