FastFiles and Zone files (BO1)

FastFile Structure

struct DB_Header
{
  char magic[8]; // "IWff0100"
  int version;
};

struct DB_AuthHeader
{
  int unknown;
  char magic[8]; // "PHEEBs71"
  int reserved;
  char fastfileName[32];
  DB_AuthSignature signedSubheaderHash;
};

Encryption & Compression

PS3

After the zone is created, it is split into blocks. The first block is the 0x28 byte XFile header . After that, each block is 0x7FC0 bytes. Each block is first compressed using best zlib compression and encrypted using salsa20.

Salsa20 Keys

PS3

0x0C, 0x99, 0xB3, 0xDD, 
0xB8, 0xD6, 0xD0, 0x84, 
0x5D, 0x11, 0x47, 0xE4, 
0x70, 0xF2, 0x8A, 0x8B, 
0xF2, 0xAE, 0x69, 0xA8, 
0xA9, 0xF5, 0x34, 0x76, 
0x7B, 0x54, 0xE9, 0x18,
0x0F, 0xF5, 0x53, 0x70

XBOX 360

0x1a, 0xc1, 0xd1, 0x2d, 
0x52, 0x7c, 0x59, 0xb4, 
0x0e, 0xca, 0x61, 0x91, 
0x20, 0xff, 0x82, 0x17, 
0xcc, 0xff, 0x09, 0xcd, 
0x16, 0x89, 0x6f, 0x81, 
0xb8, 0x29, 0xc7, 0xf5, 
0x27, 0x93, 0x40, 0x5d

Zone File

<syntaxhighlight lang="c"> struct XAsset {

 XAssetType type;
 XAssetHeader * header;

};

struct ScriptStringList {

 int count;
 const char **strings;

};

struct XAssetList {

 ScriptStringList stringList;
 int assetCount;
 XAsset *assets;

};

enum {

 XFILE_BLOCK_TEMP 		= 0,
 XFILE_BLOCK_RUNTIME 		= 1,
 XFILE_BLOCK_LARGE_RUNTIME 	= 2,
 XFILE_BLOCK_PHYSICAL_RUNTIME 	= 3,
 XFILE_BLOCK_VIRTUAL 		= 4,
 XFILE_BLOCK_LARGE 		= 5,
 XFILE_BLOCK_PHYSICAL 		= 6,
 MAX_XFILE_COUNT

};

struct XFile {

 int size;
 int unknown;
 int blockSize[MAX_XFILE_COUNT];

};