private static MemoryStream DecryptBhdFile(string filePath, GameVersion version)
{
string fileDirectory = Path.GetDirectoryName(filePath) ?? string.Empty;
string fileName = Path.GetFileName(filePath) ?? string.Empty;
string key = null;
switch (version)
{
case GameVersion.DarkSouls2:
string keyFileName = Regex.Replace(fileName, @"Ebl\.bhd$", "KeyCode.pem", RegexOptions.IgnoreCase);
string keyFilePath = Path.Combine(fileDirectory, keyFileName);
if (File.Exists(keyFilePath))
{
key = File.ReadAllText(keyFilePath);
}
break;
case GameVersion.DarkSouls3:
DecryptionKeys.TryGetRsaFileKey(fileName, out key);
break;
}
if (key == null)
{
throw new ApplicationException($"Missing decryption key for file \'{fileName}\'");
}
return(CryptographyUtility.DecryptRsa(filePath, key));
}
private static MemoryStream DecryptBhdFile(string filePath)
{
string fileName = Path.GetFileName(filePath);
string key;
if (!DecryptionKeys.TryGetRsaFileKey(fileName, out key))
{
throw new ApplicationException($"Missing decryption key for file \'{fileName}\'");
}
return(CryptographyUtility.DecryptRsa(filePath, key));
}
private static MemoryStream DecryptBhdFile(string filePath, GameVersion version)
{
string fileDirectory = Path.GetDirectoryName(filePath) ?? string.Empty;
string fileName = Path.GetFileName(filePath) ?? string.Empty;
string key = null;
// hack: bhd5 may already be decrypted!
FileStream fs = File.Open(filePath, FileMode.Open);
MemoryStream ms = new MemoryStream();
fs.CopyTo(ms);
fs.Close();
ms.Seek(0, SeekOrigin.Begin);
string bhd5_sig;
if (TryGetAsciiSignature(ms, 4, out bhd5_sig))
{
if (bhd5_sig == "BHD5")
{
return(ms);
}
}
switch (version)
{
case GameVersion.DarkSouls2:
string keyFileName = Regex.Replace(fileName, @"Ebl\.bhd$", "KeyCode.pem", RegexOptions.IgnoreCase);
string keyFilePath = Path.Combine(fileDirectory, keyFileName);
if (File.Exists(keyFilePath))
{
key = File.ReadAllText(keyFilePath);
}
break;
case GameVersion.DarkSouls3:
DecryptionKeys.TryGetRsaFileKey(fileName, out key);
break;
}
if (key == null)
{
throw new ApplicationException($"Missing decryption key for file \'{fileName}\'");
}
return(CryptographyUtility.DecryptRsa(filePath, key));
}
private static void UnpackBdtFile(Options options)
{
FileNameDictionary dictionary = FileNameDictionary.OpenFromFile(options.InputGameVersion);
string fileNameWithoutExtension = Path.GetFileName(options.InputPath).Replace("Ebl.bdt", "").Replace(".bdt", "");
string archiveName = fileNameWithoutExtension.ToLower();
using (Bdt5FileStream bdtStream = Bdt5FileStream.OpenFile(options.InputPath, FileMode.Open, FileAccess.Read))
{
Bhd5File bhdFile = Bhd5File.Read(
inputStream: DecryptBhdFile(
filePath: Path.ChangeExtension(options.InputPath, "bhd"),
version: options.InputGameVersion),
version: options.InputGameVersion
);
foreach (var bucket in bhdFile.GetBuckets())
{
foreach (var entry in bucket.GetEntries())
{
MemoryStream data;
if (entry.FileSize == 0)
{
long fileSize;
if (!TryReadFileSize(entry, bdtStream, out fileSize))
{
Console.WriteLine($"Unable to determine the length of file '{entry.FileNameHash:D10}'");
continue;
}
entry.FileSize = fileSize;
}
if (entry.IsEncrypted)
{
data = bdtStream.Read(entry.FileOffset, entry.PaddedFileSize);
CryptographyUtility.DecryptAesEcb(data, entry.AesKey.Key, entry.AesKey.Ranges);
data.Position = 0;
data.SetLength(entry.FileSize);
}
else
{
data = bdtStream.Read(entry.FileOffset, entry.FileSize);
}
string fileName;
string dataExtension = GetDataExtension(data);
bool fileNameFound = dictionary.TryGetFileName(entry.FileNameHash, archiveName, out fileName);
if (!fileNameFound)
{
fileNameFound = dictionary.TryGetFileName(entry.FileNameHash, archiveName, dataExtension, out fileName);
}
string extension;
if (fileNameFound)
{
extension = Path.GetExtension(fileName);
if (dataExtension == ".dcx" && extension != ".dcx")
{
extension = ".dcx";
fileName += ".dcx";
}
}
else
{
extension = dataExtension;
fileName = $"{entry.FileNameHash:D10}_{fileNameWithoutExtension}{extension}";
}
if (extension == ".enc")
{
byte[] decryptionKey;
if (DecryptionKeys.TryGetAesFileKey(Path.GetFileName(fileName), out decryptionKey))
{
EncFile encFile = EncFile.ReadEncFile(data, decryptionKey);
data = encFile.Data;
fileName = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));
extension = Path.GetExtension(fileName);
}
else
{
Debug.WriteLine($"No decryption key for file \'{fileName}\' found.");
}
}
if (extension == ".dcx")
{
DcxFile dcxFile = DcxFile.Read(data);
data = new MemoryStream(dcxFile.Decompress());
fileName = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));
if (fileNameFound)
{
extension = Path.GetExtension(fileName);
}
else
{
extension = GetDataExtension(data);
fileName += extension;
}
}
if (extension == ".bnd")
{
UnpackBnd3File(data, options.OutputPath);
continue; // don't actually unpack bnds
}
Debug.WriteLine(
"{0}\t{1}\t{2}\t{3}\t{4}\t{5}\t{6}\t{7}\t{8}",
fileNameWithoutExtension,
fileName,
extension,
entry.FileNameHash,
entry.FileOffset,
entry.FileSize,
entry.PaddedFileSize,
entry.IsEncrypted,
fileNameFound);
string newFileNamePath = Path.Combine(options.OutputPath, fileName);
Directory.CreateDirectory(Path.GetDirectoryName(newFileNamePath));
File.WriteAllBytes(newFileNamePath, data.ToArray());
}
}
}
}