AMPXI:ValidateDSiWareSectionMAC: Difference between revisions
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| Buf0 size | | Buf0 size (must be 0x10) | ||
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| Buf1 size | | Buf1 size (must be 0x20) | ||
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| u8 [[DSiWare_Exports|DSiWare]] section index | | u8, [[DSiWare_Exports|DSiWare]] section index | ||
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| Buf0Size<<8 <nowiki>|</nowiki> 0x4 | | (Buf0Size << 8) <nowiki>|</nowiki> 0x4 | ||
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| Buf0 | | Buf0 pointer | ||
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| Buf1Size<<8 <nowiki>|</nowiki> 0x14 | | (Buf1Size << 8) <nowiki>|</nowiki> 0x14 | ||
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| Buf1 | | Buf1 pointer | ||
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| 0 | | 0 | ||
| Header code | | Header code [0x00550040] | ||
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=Description= | =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 to verify the DSiWare section's [[DSiWare_Exports|metadata]] MAC after decrypting the payload data. | 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:ImportDSiWare|AM]] module to verify the DSiWare section's [[DSiWare_Exports|metadata]] MAC after decrypting the payload data. | ||