AMPXI:ValidateDSiWareSectionMAC
Revision as of 02:09, 10 January 2016 by Steveice10 (talk | contribs)
Request
| Index Word | Description |
|---|---|
| 0 | Header code [0x005500C4] |
| 1 | Buf0 size (must be 0x10) |
| 2 | Buf1 size (must be 0x20) |
| 3 | u8, DSiWare section index |
| 4 | (Buf0Size << 8) | 0x4 |
| 5 | Buf0 pointer |
| 6 | (Buf1Size << 8) | 0x14 |
| 7 | Buf1 pointer |
Response
| Index Word | Description |
|---|---|
| 0 | Header code [0x00550040] |
| 1 | Result code |
Description
This calculates an AES MAC over the 0x20-byte buf1 SHA-256 hash. When this MAC matches the MAC stored in buf0, result-code 0 is returned, otherwise an error is returned. This is used by AM module to verify the DSiWare section's metadata MAC after decrypting the payload data.