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The first 0x10-bytes are all-zero except the first byte which is usually 0x80. It's unknown what the first 0x10-bytes are used for.
The first 0x10-bytes are all-zero except the first byte which is usually 0x80. It's unknown what the first 0x10-bytes are used for.
−The hash at offset 0x12 hashes the 0x12-byte data at offset 0x0 followed by a zero u16. The RSA signature is signed by Nintendo. Following this header is the actual content payload, which is written to a cleartext file under the [[extdata]] /boss directory. The data following the payload header is written to extdata, but it's unknown what data is written to the extdata file before the content payload.
+The hash at offset 0x12 hashes the 0x12-byte data at offset 0x0 followed by a zero u16. The RSA signature is signed by Nintendo. Following this header is the actual content payload, which is written to a cleartext file under the [[extdata]] /boss directory.
=== Payload Content Header ===
=== Payload Content Header ===
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Line 144:
| 0x18
| 0x18
| 0x4
| 0x4
−| ?
+| Probably some version field for the payload
|-
|-
| 0x1C
| 0x1C
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The hash at offset 0x1C hashes the 0x1C-byte data at offset 0x0 followed by a zero u16, followed by all of the remaining cleartext data following this header(the actual content data).
The hash at offset 0x1C hashes the 0x1C-byte data at offset 0x0 followed by a zero u16, followed by all of the remaining cleartext data following this header(the actual content data).
+
+The downloaded boss data is written in the following format to extdata.
+First an extdata header in the following format
+{| class="wikitable"
+|-
+! Offset
+! Length
+! Description
+|-
+| 0x0
+| 0x1
+| Size of header including this field. Always 0x18
+|-
+| 0x1
+| 0xB
+| Usually zero?
+|-
+| 0xC
+| 0x4
+| Unknown
+|-
+| 0x10
+| 0x4
+| Download date in format: Bit 0-6 = day, Bit 7-10 = month, Bit 11-21 = year
+|-
+| 0x14
+| 0x4
+| Usually zero? Padding?
+|}
+Followed by the Payload Content Header without the hash and signature (first 0x1C bytes) and the actual payload.
[[Category:Nintendo Software]]
[[Category:Nintendo Software]]