PKG files

Firmware Packages

File Header

All values are in big endian format.

 typedef struct {
   u32 0x00, 0x53434500// magic
   u32 0x04, 2		// version
   u16 0x08, 0		// sdk type?
   u16 0x0a, 3		// SCE header type; pkg
   u32 0x0c, 0		// meta offset
   u64 0x10,           // size of sce_hdr + sizeof meta_hdr
   u64 0x18, 0x80      // + content_size_real
 }

Game Packages

All game packages are signed with the ECDSA signature. The public key for it can be found in download_plugin.prx or in nas_plugin.prx (this also applies to NPDRM SELFs). Usually game packages are signed with two signatures - one for the header and the other for the entry table.

File Header

All values are in big endian format.

 typedef struct {
   u32 magic;
   u32 pkg_type;
   u32 pkg_info_offset;
   u32 pkg_info_size;
   u32 header_size;
   u32 item_count;
   u64 total_size;
   u64 data_offset;
   u64 data_size;
   char contentid[0x30];
   u8 digest[0x10];
   u8 k_licensee[0x10];
 } PKG_HEADER;

field	offset	size	type	notes
Unencrypted header
magic	0x0	4	u32	Magic value of 0x7f504b47 "\x7fPKG"
pkg_type	0x4	4	u32	The package type is 1 for PS3 pkg and 2 for PSP (minis also)/Vita packages. the flag 0x80000000 is used for retail.
pkg_info_offset	0x8	4	u32	offset of the pkg_info structure
pkg_info_size	0xC	4	u32	pkg_info_size*8 = size of the pkg_info structure
header_size	0x10	4	u32	Size of the header
item_count	0x14	4	u32	Variable (0x**)
total_size	0x18	8	u64
data_offset	0x20	8	u64
data_size	0x28	8	u64
contentid	0x30	48	u8[48]	See PARAM.SFO#CONTENT_ID
digest	0x60	16	u8[16]
k_licensee	0x70	16	u8[16]

File Entry

All values are in big endian format

 typedef struct {
   u32 filename_offset;
   u32 filename_size;
   u64 data_offset;
   u64 data_size;
   u32 flags;
   u32 padding;
 } PKG_FILE_HEADER;

field	offset	type	notes
filename_offset	0x0	u32
filename_size	0x4	u32
data_offset	0x8	u64
data_size	0x10	u64
flags	0x18	u32	The file type
padding	0x1C	u32	zero

Misc/Note

From FW 4.00, install PKG from root device (but not as "bubble") for PS1 classic if not containing .EDAT files license type Free will abort.