FastFiles and Zone files (BO2)

FastFile Structure

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

struct DB_AuthSignature
{
  char bytes[256];
};

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

Encryption & Compression

PS3

After the zone file 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 compression, then encrypted using salsa20.

FastFile Keys

XBOX 360

Thanks to Chocolate.

0x0E, 0x50, 0xF4, 0x9F,
0x41, 0x23, 0x17, 0x09, 
0x60, 0x38, 0x66, 0x56, 
0x22, 0xDD, 0x09, 0x13, 
0x32, 0xA2, 0x09, 0xBA, 
0x0A, 0x05, 0xA0, 0x0E, 
0x13, 0x77, 0xCE, 0xDB, 
0x0A, 0x3C, 0xB1, 0xD3

PS3

0xC8, 0x0B, 0x0E, 0x0C,
0x15, 0x4B, 0xFF, 0x91,
0x76, 0xA0, 0xC5, 0xC8,
0xD2, 0x4F, 0xA5, 0xE3,
0xEE, 0x09, 0xEE, 0x90,
0x6F, 0x72, 0x90, 0x80,
0xA3, 0x92, 0x75, 0xFD,
0x3E, 0xA7, 0x13, 0x39 

PC

Thanks to master131.

0x64, 0x1D, 0x8A, 0x2F,
0xE3, 0x1D, 0x3A, 0xA6,
0x36, 0x22, 0xBB, 0xC9,
0xCE, 0x85, 0x87, 0x22,
0x9D, 0x42, 0xB0, 0xF8, 
0xED, 0x9B, 0x92, 0x41,
0x30, 0xBF, 0x88, 0xB6,
0x5E, 0xDC, 0x50, 0xBE

Zone File

struct XAsset
{
  XAssetType type;
  XAssetHeader *header;
};

struct ScriptStringList
{
  int count;
  const char **strings;
};

struct XAssetList
{
  ScriptStringList stringList;
  int count;
  const char **strings;
  int assetCount;
  XAsset *assets;
};

enum
{
  XFILE_BLOCK_TEMP = 0,
  XFILE_BLOCK_RUNTIME_VIRTUAL = 1,
  XFILE_BLOCK_RUNTIME_PHYSICAL = 2,
  XFILE_BLOCK_DELAY_VIRTUAL = 3,
  XFILE_BLOCK_DELAY_PHYSICAL = 4,
  XFILE_BLOCK_VIRTUAL = 5,
  XFILE_BLOCK_PHYSICAL = 6,
  XFILE_BLOCK_STREAMER_RESERVE = 7,
  MAX_XFILE_COUNT
};

struct XFile
{
  int size;
  int unknown;
  int blockSize[MAX_XFILE_COUNT];
};