/// <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);
}