private static string DeobfuscateFileName(string fileName, uint seed)
{
const string keyspace = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var sb = new StringBuilder(fileName.Length);
uint key = MersenneTwister.GenRand(seed);
int shift = (byte)((key >> 24) + (key >> 16) + (key >> 8) + key);
for (int i = 0; i < fileName.Length; i++, shift++)
{
char c = fileName[i];
// the crypto is basically caesar cipher on reversed keyspace, with shifting index
if (keyspace.Contains(c))
{
int idx = keyspace.IndexOf(c);
int reverseIdx = keyspace.Length - idx - 1;
c = keyspace[mod(reverseIdx - shift, keyspace.Length)];
}
sb.Append(c);
// mod function, because % operator is remainder
int mod(int x, int m) => (x % m + m) % m;
}
return(sb.ToString());
}
private static void UnobfuscateFileName(byte[] s, uint seed)
{
const string FWD = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
const string REV = "zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA";
//MersenneTwister.Seed(seed);
//uint key = MersenneTwister.GenRand();
uint key = MersenneTwister.GenRand(seed);
int shift = (byte)((key >> 24) + (key >> 16) + (key >> 8) + key);
for (int i = 0; i < s.Length; i++, shift++)
{
byte c = s[i];
if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
{
int index = 0;
int index2 = shift;
while (REV[index2 % 0x34] != c)
{
if (REV[(shift + index + 1) % 0x34] == c)
{
index += 1;
break;
}
if (REV[(shift + index + 2) % 0x34] == c)
{
index += 2;
break;
}
if (REV[(shift + index + 3) % 0x34] == c)
{
index += 3;
break;
}
index += 4;
index2 += 4;
if (index > 0x34)
{
break;
}
}
if (index < 0x34)
{
s[i] = (byte)FWD[index];
}
}
//shift++;
}
return;
}
/// <summary>
/// Unobfuscates the <see cref="KIFENTRY.FileNameRaw"/> field using the specified seed.
/// </summary>
/// <param name="fileName">The raw file name in bytes.</param>
/// <param name="seed">
/// The seed used to generate the unobfuscation key.
/// This is the value generated by <see cref="GenerateTocSeed"/> + entryIndex.
/// </param>
private static void UnobfuscateFileName(byte[] fileName, uint seed)
{
const int Length = 52;
const string FWD = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
const string REV = "zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA";
uint key = MersenneTwister.GenRand(seed);
int shift = (byte)((key >> 24) + (key >> 16) + (key >> 8) + key);
for (int i = 0; i < fileName.Length; i++, shift++)
{
byte c = fileName[i];
if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
{
int index = 0;
int index2 = shift;
while (REV[index2 % Length] != c)
{
if (REV[(shift + index + 1) % Length] == c)
{
index += 1;
break;
}
if (REV[(shift + index + 2) % Length] == c)
{
index += 2;
break;
}
if (REV[(shift + index + 3) % Length] == c)
{
index += 3;
break;
}
index += 4;
index2 += 4;
if (index >= Length) // We're outside the array, no need to continue
{
break;
}
}
if (index < Length) // Only assign if we're inside the array
{
fileName[i] = (byte)FWD[index];
}
}
}
}
private static string[] IdentifyFileTypes(Stream stream, string kifintPath, string vcode2)
{
BinaryReader reader = new BinaryReader(stream);
KIFHDR hdr = reader.ReadUnmanaged <KIFHDR>();
if (hdr.Signature != "KIF") // It's really a KIF INT file
{
throw new UnexpectedFileTypeException(kifintPath, "KIF");
}
KIFENTRY[] entries = reader.ReadUnmanagedArray <KIFENTRY>(hdr.EntryCount);
uint tocSeed = GenerateTocSeed(vcode2);
uint fileKey = 0;
bool decrypt = false;
// Obtain the decryption file key if one exists
for (int i = 0; i < hdr.EntryCount; i++)
{
if (entries[i].FileName == KeyFileName)
{
fileKey = MersenneTwister.GenRand(entries[i].Length);
decrypt = true;
break;
}
}
HashSet <string> extensions = new HashSet <string>();
// Decrypt the KIFINT entries using the file key
if (decrypt)
{
for (uint i = 0; i < hdr.EntryCount; i++)
{
if (entries[i].FileName == KeyFileName)
{
continue;
}
// Give the entry the correct name
UnobfuscateFileName(entries[i].FileNameRaw, tocSeed + i);
}
}
for (uint i = 0; i < hdr.EntryCount; i++)
{
string entryFileName = entries[i].FileName;
if (entryFileName == KeyFileName)
{
continue;
}
extensions.Add(Path.GetExtension(entryFileName));
}
return(extensions.ToArray());
}
public IEnumerable <IExtractableFile> LoadFilesFromArchive(string inputArchive)
{
// find keys from exe, if not present yet
if (key1 is null || key2 is null)
{
(key1, key2, indexRngSeed) = LoadKeys(Path.GetDirectoryName(inputArchive));
}
using (var fs = File.OpenRead(inputArchive))
using (var br = new BinaryReader(fs)) {
string magic = Encoding.ASCII.GetString(br.ReadBytes(4));
if (magic != FileMagic)
{
throw new InvalidMagicException();
}
int entries = br.ReadInt32();
BlowfishDecryptor dec = null;
for (int i = 0; i < entries + 1; i++)
{
string fileName = br.ReadBytes(0x40).ToCString();
ulong read = br.ReadUInt64();
if (fileName == "__key__.dat")
{
// don't make key multiple times
if (!(dec is null))
{
continue;
}
uint key = MersenneTwister.GenRand((uint)(read >> 32));
dec = new BlowfishDecryptor(new Blowfish(BitConverter.GetBytes(key)));
continue;
}
if (dec is null)
{
throw new Exception("First file entry wasn't encryption key");
}
fileName = DeobfuscateFileName(fileName, (uint)unchecked (indexRngSeed + i));
read += (ulong)i;
var newBytes = dec.TransformFinalBlock(BitConverter.GetBytes(read), 0, 8);
uint pos = BitConverter.ToUInt32(newBytes, 0);
uint len = BitConverter.ToUInt32(newBytes, 4);
yield return(new EncryptedFileSlice(fileName, pos, len, inputArchive, dec));
}
}
}
public void TestInitFromArray()
{
MersenneTwister mt = new MersenneTwister(new ulong[] {0x12345, 0x23456, 0x34567, 0x45678});
Assert.AreEqual(7266447313870364031, mt.GenRand());
}
public void TestNoSeed()
{
MersenneTwister mt = new MersenneTwister();
Assert.AreEqual(14514284786278117030, mt.GenRand());
}
/// <summary>
/// Decrypts the KIFINT archives using the known archive type, install directory, and name of executable with
/// the V_CODE2 used to decrypt.
/// </summary>
/// <param name="type">The type of archive to look for and decrypt.</param>
/// <param name="stream">The stream to the open KIFINT archive.</param>
/// <param name="installDir">The installation directory for both the archives and executable.</param>
/// <param name="exePath">The path to the executable to extract the V_CODE2 key from.</param>
/// <returns>The <see cref="KifintLookup"/> merged with all loaded archives.</returns>
///
/// <exception cref="ArgumentNullException">
/// <paramref name="stream"/>, <paramref name="kifintPath"/>, or <paramref name="exePath"/> is null.
/// </exception>
/// <exception cref="ObjectDisposedException">
/// The <paramref name="stream"/> is closed.
/// </exception>
private static KifintArchive LoadLookup(KifintType type, Stream stream, string kifintPath, string vcode2,
KifintProgressArgs progress, KifintProgressCallback callback)
{
if (kifintPath == null)
{
throw new ArgumentNullException(nameof(kifintPath));
}
if (vcode2 == null)
{
throw new ArgumentNullException(nameof(vcode2));
}
BinaryReader reader = new BinaryReader(stream);
KIFHDR hdr = reader.ReadUnmanaged <KIFHDR>();
UnexpectedFileTypeException.ThrowIfInvalid(hdr.Signature, KIFHDR.ExpectedSignature);
KIFENTRY[] entries = reader.ReadUnmanagedArray <KIFENTRY>(hdr.EntryCount);
progress.EntryName = null;
progress.EntryIndex = 0;
progress.EntryCount = entries.Length;
// Table of contents seed
uint tocSeed = GenerateTocSeed(vcode2);
uint fileKey = 0;
int fileKeyIndex = -1;
Blowfish blowfish = null;
// Obtain the decryption file key if one exists
for (int i = 0; i < hdr.EntryCount; i++)
{
if (entries[i].FileName == KeyFileName)
{
fileKey = MersenneTwister.GenRand(entries[i].Length);
blowfish = CatDebug.NewBlowfish(fileKey);
fileKeyIndex = i;
break;
}
}
const int ProgressThreshold = 500;
// Decrypt the KIFINT entries using the file key
if (fileKeyIndex != -1)
{
for (uint i = 0; i < hdr.EntryCount; i++, progress.EntryIndex++)
{
if (unchecked ((int)i) == fileKeyIndex)
{
continue;
}
// Give the entry the correct name
UnobfuscateFileName(entries[i].FileNameRaw, unchecked (tocSeed + i));
// Apply the extra offset before decryption
entries[i].Offset += i;
// Decrypt the entry's offset and length
blowfish.Decrypt(ref entries[i].Info);
progress.EntryName = entries[i].FileName;
if (i % ProgressThreshold == 0 || i + 1 == hdr.EntryCount)
{
callback?.Invoke(progress);
}
}
}
return(new KifintArchive(kifintPath, entries, fileKeyIndex != -1, fileKey, type, blowfish));
}
private static bool DecryptArchive(Stream inStream, string kifintPath, string kifintBackup, string vcode2, bool isBackup,
KifintProgressArgs progress, KifintProgressCallback callback)
{
if (kifintPath == null)
{
throw new ArgumentNullException(nameof(kifintPath));
}
if (vcode2 == null)
{
throw new ArgumentNullException(nameof(vcode2));
}
/*const string BackupName = "intbackup";
* string dir = Path.GetDirectoryName(kifintPath);
* string name = Path.GetFileName(kifintPath);
* string kifintBackup = Path.Combine(dir, BackupName, name);
* bool isBackup = Path.GetFileName(dir).ToLower() == BackupName;
* if (isBackup) {
* dir = Path.GetDirectoryName(dir);
* kifintPath = Path.Combine(dir, name);
* }
* else {
*
* }*/
Directory.CreateDirectory(Path.GetDirectoryName(kifintBackup));
BinaryReader reader = new BinaryReader(inStream);
KIFHDR hdr = reader.ReadUnmanaged <KIFHDR>();
try {
UnexpectedFileTypeException.ThrowIfInvalid(hdr.Signature, KIFHDR.ExpectedSignature);
} catch (UnexpectedFileTypeException) {
if (!isBackup && File.Exists(kifintBackup))
{
inStream.Close();
// We must have stopped while decrypting an archive. Let's restart from the already-made backup
using (inStream = File.OpenRead(kifintBackup))
DecryptArchive(inStream, kifintPath, kifintBackup, vcode2, true, progress, callback);
return(true);
}
throw;
}
List <KIFENTRY> entries = new List <KIFENTRY>(hdr.EntryCount);
entries.AddRange(reader.ReadUnmanagedArray <KIFENTRY>(hdr.EntryCount));
// Table of contents seed
uint tocSeed = GenerateTocSeed(vcode2);
uint fileKey = 0;
bool decrypt = false;
Blowfish blowfish = null;
int keyIndex = -1;
// Obtain the decryption file key if one exists
for (int i = 0; i < hdr.EntryCount; i++)
{
if (entries[i].FileName == KeyFileName)
{
fileKey = MersenneTwister.GenRand(entries[i].Length);
decrypt = true;
blowfish = CatDebug.NewBlowfish(fileKey);
keyIndex = i;
break;
}
}
// This archive is already decrypted, return and let the calling method know
if (!decrypt)
{
return(false);
}
if (isBackup)
{
using (Stream outStream = File.Create(kifintPath))
DecryptArchiveSave(hdr, entries, tocSeed, fileKey, blowfish, keyIndex, inStream, outStream,
progress, callback);
}
else
{
if (File.Exists(kifintBackup))
{
File.Delete(kifintBackup);
}
inStream.Close();
File.Move(kifintPath, kifintBackup);
using (inStream = File.OpenRead(kifintBackup))
using (Stream outStream = File.Create(kifintPath))
DecryptArchiveSave(hdr, entries, tocSeed, fileKey, blowfish, keyIndex, inStream, outStream,
progress, callback);
}
return(true);
}
private static void Run(Stream stream, string intFile, string exeFile,
string outputDir, ExkifintCallback progress = null)
{
Stopwatch watch = Stopwatch.StartNew();
DateTime startTime = DateTime.UtcNow;
string gameId = FindVCode2(exeFile);
BinaryReader reader = new BinaryReader(stream);
KIFHDR hdr = reader.ReadStruct <KIFHDR>();
if (hdr.Signature != "KIF") // It's really a KIF INT file
{
throw new InvalidFileException(Path.GetFileName(intFile), "INT");
}
KIFENTRY[] entries = reader.ReadStructArray <KIFENTRY>(hdr.EntryCount);
uint tocSeed = GenTocSeed(gameId);
uint fileKey = 0;
bool decrypt = false;
/*const string fileName = "bom_s.hg3";
* const uint offset = 1112718577;
* const int length = 1907629000;
* const uint fileKey2 = 1457527205;
* KIFENTRY kifEntry = new KIFENTRY {
* FileNameRaw = new char[64],
* Offset = offset,
* Length = length,
* };
* Array.Copy(fileName.ToCharArray(), kifEntry.FileNameRaw, fileName.Length);
* DecryptEntry(ref kifEntry, fileKey2);*/
ExkifintArgs args = new ExkifintArgs();
for (int i = 0; i < hdr.EntryCount; i++)
{
if (entries[i].FileName == "__key__.dat")
{
if (!decrypt)
{
//MersenneTwister.Seed(entries[i].Length);
//fileKey = MersenneTwister.GenRand();
fileKey = MersenneTwister.GenRand(entries[i].Length);
decrypt = true;
}
}
else
{
args.FileCount++;
}
}
DateTime lastRefresh = DateTime.MinValue;
Stopwatch writeTime = new Stopwatch();
TimeSpan refreshTime = TimeSpan.FromMilliseconds(20);
//Stopwatch processTime = new Stopwatch();
for (uint i = 0; i < hdr.EntryCount; i++)
{
if (entries[i].FileName == "__key__.dat")
{
continue;
}
if (decrypt)
{
UnobfuscateFileName(entries[i].FileNameRaw, tocSeed + i);
//UnobfuscateFileName(ref entries[i].FileName, tocSeed + i);
entries[i].Offset += i;
DecryptEntry(ref entries[i].Info, fileKey);
/*Blowfish bf = new Blowfish();
* bf.Set_Key((byte*) &file_key, 4);
* byte[] entry_buff = entries[i].bytes;
* bf.Decrypt(entry_buff, 8);
* entries[i].bytes = entry_buff;*/
}
args.Ellapsed = DateTime.UtcNow - startTime;
// Round to nearest hundredth
args.Percent = Math.Round((double)args.FileIndex / args.FileCount * 10000) / 100;
args.FileName = entries[i].FileName;
TimeSpan sinceRefresh = DateTime.UtcNow - lastRefresh;
if (sinceRefresh >= refreshTime)
{
lastRefresh = DateTime.UtcNow;
writeTime.Start();
progress?.Invoke(args);
writeTime.Stop();
}
//processTime.Restart();
stream.Position = entries[i].Offset;
byte[] buffer = reader.ReadBytes(entries[i].Length);
if (decrypt)
{
DecryptData(buffer, entries[i].Length, fileKey);
/*Blowfish bf = new Blowfish();
* bf.Set_Key((byte*)&file_key, 4);
* bf.Decrypt(buff, (len / 8) * 8);*/
}
string path = Path.Combine(outputDir, entries[i].FileName);
File.WriteAllBytes(path, buffer);
args.FileIndex++;
//processTime.Stop();
//if (processTime.ElapsedMilliseconds >= 500)
// Trace.WriteLine($"Large File: {buffer.Length / 1024:###,###,###,###}KB [{processTime.ElapsedMilliseconds}ms]");
}
args.Ellapsed = DateTime.UtcNow - startTime;
args.Percent = 100.0;
progress?.Invoke(args);
Trace.WriteLine($"Console Write Time: {writeTime.Elapsed:mm\\:ss\\.fff}");
}
public static void GH()
{
ulong[] arr = { 0x12345, 0x23456, 0x34567, 0x45678 };
MersenneTwister mt = new MersenneTwister(arr);
for (int i = 0; i < 5; i++) {
Console.Write(String.Format("{0:d20} ", mt.GenRand()));
}
Console.WriteLine();
}