Sealedkey / pfsSKKey

sealedkey file is located in sce_sys folder of savedata/trophies. It is not PFS encrypted.

It is used as a per savedata/trophy key in PFS encryption/decryption whilst gamedata/addcont uses klicensee.

Decryption
The first step is to check the HMAC of the file. The process is to use the HMAC key from the Keys page to check the HMAC 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.