PARAM.PFD

PARAM.PFD

This file is responsible for making sure the save games aren't tampered with. To prevent file modification of this file and other games files, the cryptographic signatures are inside this file. Some games don't sign their files here though (more info on unprotected saves:Game Saves).

Structure

File size is 0x8000 bytes

Offset	Size	Description	Value
0x00	0x04 bytes	Nothing	All zeroes
0x04	0x04 bytes	Magic value	"PFDB" in ASCII
0x08	0x08 bytes	Unknown	0x3
0x10	0x50 bytes	Public key	Method unknown
0x60	0x08 bytes	Unknown	0x39
0x68	0x08 bytes	Unknown	0x72
0x70	0x08 bytes	Number of files	= x

then:

table of consisting 60 * 8byte-words
0x72 = no entry
0- x = entry id

each entry:

 65 bytes null-terminated filename (filename appears to be 0x72 bytes in length?
 (followed by the certificate?)
 - bob)
 4 bytes unknown (first byte zero, 2 bytes vary, third byte fixed)
 0x54 bytes certificate (if param.sfo is file, then size = 0x90 bytes)
 0x2c bytes zero padding (only if after param.sfo; otherwise 0x68 bytes zero padding -bob)
 4 bytes file size
 8 bytes table-entry again (???)

 weird repeating 20-byte pattern on file-end (some kind of sha-1 hash??)

 The weird repeating pattern 60 x 12 bytes so an entry for each potential file with the blank entry (I.E. no file)
 being represented by the repeating byte pattern.

Source: http://ps3dev.wikispaces.com/PARAM.PFD