public void DecryptFirstChunkCorrectly()
{
byte[] encrypted = new byte[]
{
0x90, 0x94, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0x2D, 0x00, 0x00, 0x83, 0x1E, 0x4E, 0x60,
0xBE, 0xE9, 0xE8, 0x94, 0xE9, 0x51, 0x8B, 0x2E, 0x9E, 0xDF, 0x9E, 0x69, 0xCC, 0x8B, 0x55, 0x79
};
byte[] expected = new byte[]
{
0x78, 0x9C, 0xB5, 0x7D, 0x07, 0x9C, 0x14, 0x45, 0xF6, 0x7F, 0x75, 0x4F, 0x0E, 0xBB, 0x3B, 0x9B
};
var data = EgsEncryption.Decrypt(new MemoryStream(encrypted));
Assert.Equal(ToString(expected), ToString(data[0..16]));
public void GenerateKeyCorrectly()
{
byte[] expected = new byte[]
{
0x90, 0x94, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0xF0, 0x2D, 0x0A, 0x0B, 0x83, 0x1E, 0x4E, 0x60,
0x1F, 0x61, 0x9A, 0xEE, 0x1B, 0x64, 0x9C, 0xE9, 0xEB, 0x49, 0x96, 0xE2, 0x68, 0x57, 0xD8, 0x82,
0xF5, 0x54, 0xEF, 0xB1, 0xEE, 0x30, 0x73, 0x58, 0x05, 0x79, 0xE5, 0xBA, 0x6D, 0x2E, 0x3D, 0x38,
0xBF, 0x22, 0x88, 0xAC, 0x51, 0x12, 0xFB, 0xF4, 0x54, 0x6B, 0x1E, 0x4E, 0x39, 0x45, 0x23, 0x76,
0x27, 0xA3, 0xD1, 0x10, 0x76, 0xB1, 0x2A, 0xE4, 0x22, 0xDA, 0x34, 0xAA, 0x1B, 0x9F, 0x17, 0xDC,
0xB2, 0x42, 0x70, 0x15, 0xC4, 0xF3, 0x5A, 0xF1, 0xE6, 0x29, 0x6E, 0x5B, 0xFD, 0xB6, 0x79, 0x87,
0xAB, 0xD8, 0xF7, 0xE8, 0x6F, 0x2B, 0xAD, 0x19, 0x89, 0x02, 0xC3, 0x42, 0x74, 0xB4, 0xBA, 0xC5,
0x2E, 0x80, 0x83, 0x89, 0x41, 0xAB, 0x2E, 0x90, 0xC8, 0xA9, 0xED, 0xD2, 0xBC, 0x1D, 0x57, 0x17,
0x7C, 0x68, 0x62, 0xF5, 0x3D, 0xC3, 0x4C, 0x65, 0xF5, 0x6A, 0xA1, 0xB7, 0x49, 0x77, 0xF6, 0xA0,
0x80, 0xA8, 0x27, 0x58, 0xBD, 0x6B, 0x6B, 0x3D, 0x48, 0x01, 0xCA, 0x8A, 0x01, 0x76, 0x3C, 0x2A,
0xEF, 0x8F, 0x32, 0xD0, 0x52, 0xE4, 0x59, 0xED, 0x1A, 0xE5, 0x93, 0x67, 0x1B, 0x93, 0xAF, 0x4D,
};
var seed = new byte[]
{
0x90, 0x94, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0x2D, 0x00, 0x00, 0x83, 0x1E, 0x4E, 0x60
};
Assert.Equal(ToString(expected), ToString(EgsEncryption.GenerateKey(seed, 10)));
}
private List <EgsHdAsset.RemasteredEntry> ReplaceRemasteredAssets(string originalFile, EgsHdAsset asset, FileStream pkgStream, byte[] seed, byte[] originalAssetData, byte[] originalUncompressedData)
{
var newRemasteredHeaders = new List <EgsHdAsset.RemasteredEntry>();
var relativePath = GetRelativePath(originalFile, Path.Combine(InputFolder, ORIGINAL_FILES_FOLDER_NAME));
var baseRemasteredFolder = Path.Combine(InputFolder, REMASTERED_FILES_FOLDER_NAME, relativePath);
var remasteredAssetsFolder = GetHDAssetFolder(baseRemasteredFolder);
var remasteredAssetFiles = asset.Assets;
var allRemasteredAssetsData = new MemoryStream();
// 0x30 is the size of this header
var totalRemasteredAssetHeadersSize = (remasteredAssetFiles.Count() * 0x30);
var offsetPosition = originalUncompressedData.Length;
foreach (var remasteredAssetFile in remasteredAssetFiles)
{
var assetFilePath = Path.Combine(remasteredAssetsFolder, remasteredAssetFile);
var uncompressedData = new byte[] {};
var compressedData = new byte[] {};
var encryptedData = new byte[] {};
if (File.Exists(assetFilePath))
{
Console.WriteLine($"Replacing remastered file: {relativePath}/{remasteredAssetFile}");
uncompressedData = File.ReadAllBytes(assetFilePath);
compressedData = asset.RemasteredAssetHeaders[remasteredAssetFile].CompressedLength > -1 ? CompressData(uncompressedData) : uncompressedData;
Console.WriteLine(asset.RemasteredAssetHeaders[remasteredAssetFile].CompressedLength);
//Read the remastered file regardless, to set the correct offset
encryptedData = asset.ReadRawRemasteredAsset(remasteredAssetFile);
encryptedData = asset.RemasteredAssetHeaders[remasteredAssetFile].CompressedLength > -2 ? EgsEncryption.Encrypt(compressedData, seed) : compressedData;
}
else
{
Console.WriteLine($"Keeping remastered file: {relativePath}/{remasteredAssetFile}");
encryptedData = asset.ReadRawRemasteredAsset(remasteredAssetFile);
uncompressedData = new byte[asset.RemasteredAssetHeaders[remasteredAssetFile].DecompressedLength];
}
var currentOffset = totalRemasteredAssetHeadersSize + offsetPosition + 0x10;
var entryCompressedLength = encryptedData.Length;
if (asset.RemasteredAssetHeaders[remasteredAssetFile].CompressedLength == -1)
{
entryCompressedLength = (int)-1; // -1 is uncompressed
}
if (asset.RemasteredAssetHeaders[remasteredAssetFile].CompressedLength == -2)
{
entryCompressedLength = (int)-2; // -2 is uncompressed and unencrypted
}
var remasteredEntry = new EgsHdAsset.RemasteredEntry()
{
CompressedLength = entryCompressedLength,
DecompressedLength = (int)uncompressedData.Length,
Name = remasteredAssetFile,
Offset = currentOffset,
Unknown24 = asset.RemasteredAssetHeaders[remasteredAssetFile].Unknown24
};
newRemasteredHeaders.Add(remasteredEntry);
// Write asset header in the PKG stream
BinaryMapping.WriteObject <EgsHdAsset.RemasteredEntry>(pkgStream, remasteredEntry);
// Don't write into the PKG stream yet as we need to write
// all HD assets header juste after original file's data
allRemasteredAssetsData.Write(encryptedData);
if (encryptedData.Length % 0x10 != 0)
{
allRemasteredAssetsData.Write(Enumerable.Repeat((byte)0xCD, 16 - (encryptedData.Length % 0x10)).ToArray());
}
offsetPosition += uncompressedData.Length;
}
pkgStream.Write(originalAssetData);
pkgStream.Write(allRemasteredAssetsData.ReadAllBytes());
return(newRemasteredHeaders);
}
private Hed.Entry ReplaceFile(string filename, string inputFolder, FileStream hedStream, FileStream pkgStream, EgsHdAsset asset, Hed.Entry originalHedHeader = null)
{
var filesToReplace = GetAllFiles(inputFolder);
var originalfilename = GetRelativePath(filename, Path.Combine(InputFolder, ORIGINAL_FILES_FOLDER_NAME));
byte[] data = new byte[asset.OriginalAssetHeader.DecompressedLength];
byte[] compressedData = new byte[] {};
byte[] encryptedData = new byte[] {};
var header = CreateAssetHeader(
data,
asset.OriginalAssetHeader.CompressedLength,
asset.OriginalAssetHeader.RemasteredAssetCount,
asset.OriginalAssetHeader.Unknown0c
);
var encryptionKey = asset.Key;
if (filesToReplace.Contains(originalfilename))
{
Console.WriteLine($"Replacing original: {originalfilename}!");
Console.WriteLine(header.CompressedLength);
// Read Raw data to set the correct offset even if we're reading from an external file
data = asset.ReadRawData();
header.DecompressedLength = data.Length;
data = File.ReadAllBytes(filename);
header.DecompressedLength = data.Length;
compressedData = header.CompressedLength > -1 ? CompressData(data) : data;
if (header.CompressedLength > -1)
{
header.CompressedLength = compressedData.Length;
}
Console.WriteLine(header.CompressedLength);
if (header.CompressedLength > -2)
{
var seed = new MemoryStream();
// The seed used for encryption is the data header6
BinaryMapping.WriteObject <EgsHdAsset.Header>(seed, header);
encryptionKey = seed.ReadAllBytes();
// Encrypt file
encryptedData = header.CompressedLength > 2 ? EgsEncryption.Encrypt(compressedData, encryptionKey) : compressedData;
}
}
else
{
Console.WriteLine($"Keeping original: {originalfilename}!");
//data = asset.ReadRawData();
compressedData = asset.ReadRawData();
encryptedData = compressedData;
}
var offset = pkgStream.Position;
BinaryMapping.WriteObject <EgsHdAsset.Header>(pkgStream, header);
var remasteredHeaders = new List <EgsHdAsset.RemasteredEntry>();
// Is there remastered assets?
if (header.RemasteredAssetCount > 0)
{
remasteredHeaders = ReplaceRemasteredAssets(originalfilename, asset, pkgStream, encryptionKey, encryptedData, data);
// If a remastered asset is not replaced, we still want to count its size for the HED entry
foreach (var remasteredAssetName in asset.RemasteredAssetHeaders.Keys)
{
if (!remasteredHeaders.Exists(header => header.Name == remasteredAssetName))
{
remasteredHeaders.Add(asset.RemasteredAssetHeaders[remasteredAssetName]);
}
}
}
else
{
// Make sure to write the original file after remastered assets headers
pkgStream.Write(encryptedData);
}
// Write a new entry in the HED stream
var hedEntry = CreateHedEntry(originalfilename, data, (int)(pkgStream.Position - offset), offset, remasteredHeaders);
BinaryMapping.WriteObject <Hed.Entry>(hedStream, hedEntry);
return(hedEntry);
}