The Switch uses the NRR file format to verify NRO at load time. These files contain hashes of each NRO that is allowed to be loaded by the program. An NRO's SHA-256 hash must match any of the hashes in the hash table. NRRs are signed with RSASSA-PSS-2048/SHA-256.
NrrHeader
This is "nn::ro::detail::NrrHeader".
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | Signature ("NRR0") |
| 0x4 | 0x1 | [9.0.0+] SignKeyGeneration |
| 0x5 | 0xB | Reserved |
| 0x10 | 0x220 | Certification |
| 0x230 | 0x100 | Sign (signature verifiable with the certification key, over the rest of the file) |
| 0x330 | 0x8 | ProgramId |
| 0x338 | 0x4 | Size |
| 0x33C | 0x1 | NrrKind (0 = User, 1 = JitPlugin) |
| 0x33D | 0x3 | Reserved |
| 0x340 | 0x4 | HashListOffsetAddress (always 0x350) |
| 0x344 | 0x4 | NumHash |
| 0x348 | 0x8 | Reserved |
| 0x350 | 0x20 * NumHash | NroHashList (SHA-256) |
NrrCertification
This is "nn::ro::detail::NrrCertification".
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | ProgramIdMask |
| 0x8 | 0x8 | ProgramIdPattern |
| 0x10 | 0x10 | Reserved |
| 0x20 | 0x100 | PublicKey (modulus for verifying the NRR signature) |
| 0x120 | 0x100 | Sign (signature over the above contents) |