Sealedkey / pfsSKKey: Difference between revisions
Jump to navigation
Jump to search
CelesteBlue (talk | contribs) No edit summary |
CelesteBlue (talk | contribs) No edit summary |
||
| Line 26: | Line 26: | ||
{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
! Offset !! Size !! Description !! | ! Offset !! Size !! Description !! Notes | ||
|- | |- | ||
| 0 || 8 || Magic || "pfsSKKey" | | 0 || 8 || Magic || "pfsSKKey" standing for PFS SealedKey Key | ||
|- | |- | ||
| 0x8 || 2 || [[#Keyset]] || | | 0x8 || 2 || [[#Keyset]] || | ||
| Line 34: | Line 34: | ||
| 0xA || 6 || Padding || Zeroed | | 0xA || 6 || Padding || Zeroed | ||
|- | |- | ||
| 0x10 || 16 || IV || | | 0x10 || 16 || IV || AES-128-CBC IV for use with the pfsSKKey__EncKey Key | ||
|- | |- | ||
| 0x20 || 32 || Encrypted Sealed Key || | | 0x20 || 32 || Encrypted Sealed Key || | ||
|- | |- | ||
| 0x40 || 32 || Digest || HMAC- | | 0x40 || 32 || Digest || HMAC-SHA256 digest for use with the pfsSKKey__Secret Key | ||
|} | |} | ||
| Line 62: | Line 62: | ||
| 2 || 4.55 || | | 2 || 4.55 || | ||
|- | |- | ||
| 3 || ?5.05? || | | 3 || ?4.70? || | ||
|- | |||
| 4 || 5.05 || | |||
|- | |||
| 5 || ? || | |||
|- | |||
| 6 || ? || | |||
|- | |||
| 7 || ? || | |||
|- | |||
| 8 || ? || | |||
|- | |||
| 9 || ? || | |||
|- | |- | ||
| 10 || 12.00 || | | 10 || 12.00 || | ||
|} | |} | ||
For example, in PS4 4.55 kernel, the function '''sceSblSsDecryptSealedKey''' checks that keyset is less or equal 2 before calling '''sceSblSsDecryptWithPortability'''. | For example, in PS4 4.55 kernel, the function '''sceSblSsDecryptSealedKey''' checks that the keyset is less or equal 2 before calling '''sceSblSsDecryptWithPortability'''. | ||
== Usage == | == Usage == | ||
With code execution in PS4 kernel, the sealed key can be decrypted by asking the PS4 kernel. | 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#%3C=_?7.55?_-_Missing_HMAC_key_length_check_in_Secure_Kernel_leading_to_Partial_SAMU_KeyRings_bruteforce]]). | |||
{{File Formats}} | {{File Formats}} | ||
<noinclude>[[Category:Main]]</noinclude> | <noinclude>[[Category:Main]]</noinclude> | ||
Revision as of 03:38, 14 December 2024
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 | 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).
