pak are not decrypted and then decompressed in their entirety before they are parsed. pak don't have LZO-compressed data sections (BUUR header)). pak files, not the LZO compression specific to. (Note: this is about the deflate compression specific to. Not addressing these will result in corrupt data. gbx files, which may not seem important at first sight but actually make a world of difference when extracting them. There are some not-so-obvious details about compressed. The type of the file can be found from the extension in the name, or, if this is not available (many file names are actually just hashes), from the class ID. If FileDesc.flags & 0x7C is not zero, the file is compressed and should be decompressed using zlib deflate after decryption (it will end up at FileDesc.uncompressedSize bytes). Then, pressedSize bytes are read and decrypted using Blowfish in CBC mode, using the same key that was used to decrypt the header. From version 15, the data block starts at HeaderMaxSize. The content of each file starts at Header.dataStart + FileDesc.offset in the. If version = 15: DataStart = HeaderMaxSize Uint32 GbxHeadersStart // Offset to the metadata section String UsageSubDir // to known the kind of pack it isīlowfish encrypted: // Unencrypted if neither SHeaderFlagsUncrypt.IsHeaderPrivate nor SHeaderFlagsUncrypt.UseDefaultHeaderKey are set Uint64 CreationDate // Win32 FILETIME structure Uint256 ContentsChecksum // Checksum Sha256 of the pack contents starting at next byte Lopart = (pInput | 0xAA) ^ ((lopart > 19)) IvXor is initially zero, but if requested, its value can be changed through the following function: It should be noted that the file data is not hashed, nor cryptographically signed. To calculate it, set the md5 field in the header to all zeros, and calculate the MD5 hash of the entire encrypted part of the header. The header contains a checksum hash of itself for integrity checking purposes. Uint32 classID // indicates the type of the file Uint32 parentFolderIndex // index into folders -1 if this is a root folder Uint32 gbxHeadersStart // offset to metadata section Header version 3 byte magic // "NadeoPak" gbx files embedded in packs.Ī description of the used data types can be found on the GBX page. So if you don't take this into account, half your file table will be messed up (which is likely what Nadeo was intending with this trick). pak header, of which the effect usually kicks in somewhere in the middle of the file list. Crucially though it does get assigned a non-zero value while reading the. ivXor is initialized to zero and is also reset to zero every time it is applied, so most times it doesn't have an effect. There is one gotcha where Nadeo deviates from regular CBC: on the first read and after every 256 bytes read, the current IV is xor'd with a value we'll call ivXor (this happens before the IV is applied to the Blowfish-decrypted block). The keys for the different packs are found in packlist.dat. From then on, Blowfish decryption commences.Įach. When an encrypted block begins, decryption is initialized by reading an 8-byte, plaintext IV ( initialization vector) from the file.
In a short time it will extract the contents of the folder for you to start playing with.pak files are encrypted using Blowfish in CBC mode with a 16-byte key. To use this tool, go to your Runic Games/Torchlight II/PAKS folder (for Steam users this is located somewhere like C:\Program Files (x86)\Steam\steamapps\common\Torchlight II\PAKS).
#.PAK FILE EXTRACTOR HOW TO#
At this time (on launch day, September 20th) modding is not yet officially supported, but according to the developers it should be possible to get the game to load some form of mod by using a similar technique to Torchlight 1 - recreating the MEDIA folder's structure with replacement files under a specific folder.Īt the time of this writing, no one one has verified how to load mods, but hopefully some persistent or lucky person will figure it out and share it soon, at which point this post and database will be updated.
#.PAK FILE EXTRACTOR MODS#
The purpose of this tool is to allow for people to start making mods as soon as we figure out how to load them. This is a tool used to extract the data files from Torchlight 2's DATA.PAK file.
#.PAK FILE EXTRACTOR DOWNLOAD#
This tool is causing some confusion, so I have removed the download from this entry. Please follow the mirror link to the Modified Extractor Tool, as that one properly creates.
0 kommentar(er)
