Sealedkey

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File Structure

Offset Size Description
0x0 0x8 magic "pfsSKKey"
0x8 0x1 major version (always 2)
0x9 0x1 minor version (always 0)
0xA 0x6 00 Filler
0x10 0x10 IV for encrypted key
0x20 0x10 Encrypted key
0x30 0x20 HMAC Value

The first step is to check the HMAC of the file. The process is to use the HMAC key pfsSKKey__Secret from the Keys#PFS_Secret_Keys page to check the HMAC Value at position 0x30 in the file.

If it is correct, it proceeds to use the pfsSKKey__EncKey to decrypt the value at +0x20 using the value at +0x10 as the IV.