NPD

NPD is a packet format used on PS3 in NPDRM contents. It corresponds to 2 sort of packets: the ones in SDAT/EDAT files and the ones in SELF/SPRX NPDRM header in NPDRM SELF/SPRX files. NPD stands for Network Playstation Drm. The PS Vita equivalent of PS3 "NPD" packets are "DRM" packets.

Location

NPD packets are stored in EDAT files and in NPDRM SELF - SPRX files.

Structure

Offset	Name	Size	Type	Notes
0x00	Magic	4	char[4]	"NPD\0" (4E 50 44 00)
0x04	Version	4	uint32_t	ex: 1, 2, 3, 4. See EDAT_files#Footer for the precise NPD packager version.
0x08	DRM Type	4	uint32_t	For PS2 EDAT, PS3 OS requires it to be with activation (i.e. Local DRM). For PS1 PKG, PS3 System Software version 4.00 introduced some changes for installing them with regard to the EDAT DRM type.
0x0C	Application Type	4	uint32_t
0x10	Content ID	0x30	uint8_t[0x30]	Content ID (with padding to fit 48 bytes)
0x40	Digest	0x10	uint8[0x10]	QA digest. It seems to be a SHA-1 hash of the non-finalized file (debug SELF/SPRX created with make_fself_npdrm) or of the original EDAT data. Original data are unknown until the whole file is read, so it cannot be used as a check, however it can be used as watermark or zeroed on forged file.
0x50	CID-FN Hash	0x10	uint8_t[0x10]	CID-FN hash. AES-CMAC hash of concatenation of Content ID (48 bytes) and EDAT/SELF filename (eg "MINIS.EDAT", "EBOOT.BIN") using the npd_cid_fn_hash_aes_cmac_key. Example: aes_cmac(55 50 30 35 37 36 2D 4E 50 55 5A 30 30 31 34 39 5F 30 30 2D 56 41 4E 47 55 41 52 44 32 30 30 30 30 30 30 31 00 00 00 00 00 00 00 00 00 00 00 00 4D 49 4E 49 53 2E 45 44 41 54, npd_cid_fn_hash_aes_cmac_key).
0x60	Header Hash	0x10	uint8_t[0x10]	Header hash. AES CMAC hash of the 0x60 bytes from the beginning of the file using (klicensee XOR npd_header_hash_xor_key) as AES-CMAC key.
0x70	Limited Time Start	8	uint64_t milliseconds	Start of the validity period, filled with 00 if not used.
0x78	Limited Time End	8	uint64_t milliseconds	End of the validity period, filled with 00 if not used.

typedef struct PS3_NPD { //size is 0x80 bytes
  uint32_t magic; // 4E 50 44 00 ("NPD.")
  uint32_t version;
  uint32_t drm_type;
  uint32_t app_type;
  uint8_t content_id[0x30];
  uint8_t digest[0x10];
  uint8_t cid_fn_hash[0x10];
  uint8_t header_hash[0x10];
  uint64_t limited_time_start;
  uint64_t limited_time_end;
} PS3_NPD;

Tools

• The official tool to generate NPD packets is make_package_npdrm. See PKG_files#Package_Tools.
• The main tool to deal with NPD packets is make_npdata by Hykem.