Sealedkey / pfsSKKey

The Sealed Key is a an encrypted key used on PS Vita, PS4 and PS5 to prevent files modification and extraction. It can be found on different places in the filesystem and is used for Save Data and Trophy Data decryption and encryption.

See also PS Vita Sealedkey.

PS4

Location

The sealedkey file is located in the folder of every savedata/trophies. It is not PFS encrypted.

Kind	Path
Trophy	/user/home/User Id/trophy/data/sce_trop/sealedkey
Save Data (internal HDD)	/user/home/User Id/Title ID/save data directory/sce_sys/
Save Data (USB Storage)	/PS4/SAVEDATA/User Id/Title ID/<sealed_filename>.bin

Structure

• Size is always 96 bytes.

Offset	Size	Description	Notes
0	8	Magic	"pfsSKKey" standing for PFS SealedKey Key
0x8	2	#Keyset
0xA	6	Padding	Zeroed
0x10	16	IV	AES-128-CBC IV for use with the pfsSKKey__EncKey Key
0x20	32	Encrypted Sealed Key
0x40	32	Digest	HMAC-SHA256 digest for use with the pfsSKKey__Secret Key

  typedef struct {
      const char magic[8];
      unsigned short keyset;
      unsigned char reserved[6];
      unsigned char iv[16];
      unsigned char encrypted_sealedkey[32];
      unsigned char digest[32];
  } sealed_key;

Keyset

Keyset	System Software version	Notes
1	1.01-1.73
2	4.55
3	?4.70?
4	5.05
5	?
6	?
7	?
8	?
9	?
10	?8.00?-12.00

For example, in PS4 4.55 kernel, the function sceSblSsDecryptSealedKey checks that the keyset is less or equal 2 before calling sceSblSsDecryptWithPortability.

Usage

With code execution in PS4 kernel, the sealed key can be decrypted by asking the PS4 kernel:

• with sceSblSsDecryptSealedKey (see Talk page),
• or with sceSblSsDecryptWithPortability (reimplement sceSblSsDecryptSealedKey by reversing Kernel),
• or with portability master keys (see Vulnerabilities#<=_?7.55?_-_Missing_HMAC_key_length_check_in_Secure_Kernel_leading_to_Partial_SAMU_KeyRings_bruteforce).