CTCert
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Summary
The console-unique CTCert is used for signing CTX files, the DeviceCert used by eShop, and presumably for DSiWare exports. This ECDSA signature, the ECDSA private key, and the IssuerID is loaded from memory instead of NAND. This is the 3DS equivalent of DSi TWCert.
Structure
| Offset | Size | Description |
|---|---|---|
| 0x00 | 0x04 | Type |
| 0x04 | 0x3C | ECDSA Signature |
| 0x40 | 0x40 | Padding |
| 0x80 | 0x40 | Cert Issuer ID, for retail this is "Nintendo CA - G3_NintendoCTR2prod", for dev "Nintendo CA - G3_NintendoCTR2dev" |
| 0xC0 | 0x04 | Key Type |
| 0xC4 | 0x40 | Key ID: "CT<DeviceId>-<ConsoleType>", where DeviceId is the hex DeviceId, and ConsoleType is 00 for retail, 01 for dev |
| 0x104 | 0x3C | ECDSA Public Key |
| 0x140 | 0x40 | Padding |
The ECDSA private key is located 0x3C bytes before this cert in internal memory.