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→NFC pages
Line 55:
Line 55:
+| ?+
| Last 3-bytes here are used with the following HMAC. The first byte is normally 0xA5. The remaining bytes are initially(before the Amiibo is written to) all-zero. Byte[2] here is increased each time the Amiibo is written to.
| Last 3-bytes here are used with the following HMAC. The first byte is normally 0xA5. The remaining bytes are initially(before the Amiibo is written to) all-zero. Byte[2] here is increased each time the Amiibo is written to.
|-
|-
−| ?
+| 5
+|
+| 0x14
+|
+| The system crypts 0x1A0-bytes with a buffer containing data loaded from here.
+|-
+| 0x20/32
| 8
| 8
−| ?
+| 0x80
| 0x20
| 0x20
−| SHA256-HMAC over 0x1DF-bytes: first 3-bytes are from the last 3-bytes of page[4], the rest is over the first 0x1DC-bytes of the plaintext data following this hash.
+| SHA256-HMAC over 0x1DF-bytes: first 3-bytes are from the last 3-bytes of page[4], the rest is over the first 0x1DC-bytes of the plaintext data.
+|}
+==== Encrypted data buffer structure ====
+{| class="wikitable" border="1"
|-
|-
−! Encrypted buffer offset
−|
+! Byte offset in the actual NFC data, relative to page[5]
−| ?
+! Size
−|
+|-
−| The system crypts 0x1A0-bytes starting here.
+| 0x0
+| 0x0
+| 0x20
|}
|}