SpotPass: Difference between revisions

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@@ Line 27: / Line 27: @@
 == Content Container ==
-All SpotPass content uses this container to encrypt the payload.(and possibly sign it) The cleartext payload is stored in [[extdata]].
+All SpotPass content uses this container to encrypt the payload and sign it. The cleartext payload is stored in [[extdata]]. This header format is big-endian.
 {| class="wikitable"
@@ Line 41: / Line 41: @@
 | 0x4
 | 0x4
-| Always 00 01 00 01
+| Magic Number 0x1000100
 |-
 | 0x8
@@ Line 48: / Line 48: @@
 |-
 | 0xC
-| 0x4
+| 0x8
-| Always 00 00 00 00
+| u64 release date (UNIX timestamp)
-|-
-| 0x10
-| 0x4
-| Release date (UNIX timestamp)
 |-
 | 0x14
@@ Line 59: / Line 55: @@
 | Always 00 01 00 00 00 02 00 02
 |-
-| 0x1c
+| 0x1C
-| 0x27a?
+| 0xC
-| Unknown, going by the size of this a RSA-4096 signature might be stored here among other things?
+| First 12 bytes of the CTR
 |}
-Data following the header is encrypted, the CTR used is likely based on metadata in the header.(like the timestamp)
+Data following the header is encrypted with AES-CTR. The first 12 bytes of the CTR are from offset 0x1C of the header, while the last word of the CTR in big-endian is 0x1. The cleartext data begins with another unknown SpotPass header which contains the RSA-2048 signature. Following that header is the actual content.
-It appears that this file format is big-endian, unlike other 3DS formats.
 [[Category:Nintendo Software]]