public AesXtsFile(OpenMode mode, IFile baseFile, string path, ReadOnlySpan <byte> kekSeed, ReadOnlySpan <byte> verificationKey, int blockSize)
{
Mode = mode;
BaseFile = baseFile;
Path = path;
KekSeed = kekSeed.ToArray();
VerificationKey = verificationKey.ToArray();
BlockSize = blockSize;
Header = new AesXtsFileHeader(BaseFile);
if (!Header.TryDecryptHeader(Path, KekSeed, VerificationKey))
{
ThrowHelper.ThrowResult(ResultFs.AesXtsFileHeaderInvalidKeys, "NAX0 key derivation failed.");
}
if (HeaderLength + Util.AlignUp(Header.Size, 0x10) > baseFile.GetSize())
{
ThrowHelper.ThrowResult(ResultFs.AesXtsFileTooShort, "NAX0 key derivation failed.");
}
IStorage encStorage = BaseFile.AsStorage().Slice(HeaderLength, Util.AlignUp(Header.Size, 0x10));
BaseStorage = new CachedStorage(new Aes128XtsStorage(encStorage, Header.DecryptedKey1, Header.DecryptedKey2, BlockSize, true), 4, true);
}
private void RenameDirectoryImpl(string srcDir, string dstDir, bool doRollback)
{
IDirectory dir = OpenDirectory(dstDir, OpenDirectoryMode.All);
foreach (DirectoryEntry entry in dir.Read())
{
string subSrcPath = $"{srcDir}/{entry.Name}";
string subDstPath = $"{dstDir}/{entry.Name}";
if (entry.Type == DirectoryEntryType.Directory)
{
RenameDirectoryImpl(subSrcPath, subDstPath, doRollback);
}
if (entry.Type == DirectoryEntryType.File)
{
if (doRollback)
{
if (TryReadXtsHeader(subDstPath, subDstPath, out AesXtsFileHeader header))
{
WriteXtsHeader(header, subDstPath, subSrcPath);
}
}
else
{
AesXtsFileHeader header = ReadXtsHeader(subDstPath, subSrcPath);
WriteXtsHeader(header, subDstPath, subDstPath);
}
}
}
}
private void WriteXtsHeader(AesXtsFileHeader header, string filePath, string keyPath)
{
Debug.Assert(PathTools.IsNormalized(filePath.AsSpan()));
Debug.Assert(PathTools.IsNormalized(keyPath.AsSpan()));
header.EncryptHeader(keyPath, KekSource, ValidationKey);
using (IFile file = BaseFileSystem.OpenFile(filePath, OpenMode.ReadWrite))
{
file.Write(header.ToBytes(false), 0, WriteOption.Flush);
}
}
private bool TryReadXtsHeader(string filePath, string keyPath, out AesXtsFileHeader header)
{
Debug.Assert(PathTools.IsNormalized(filePath.AsSpan()));
Debug.Assert(PathTools.IsNormalized(keyPath.AsSpan()));
using (IFile file = BaseFileSystem.OpenFile(filePath, OpenMode.Read))
{
header = new AesXtsFileHeader(file);
return(header.TryDecryptHeader(keyPath, KekSource, ValidationKey));
}
}
/// <summary>
/// Creates a new <see cref="AesXtsFile"/> using the provided key.
/// </summary>
/// <param name="path">The full path of the file to create.</param>
/// <param name="size">The initial size of the created file.</param>
/// <param name="options">Flags to control how the file is created.
/// Should usually be <see cref="CreateFileOptions.None"/></param>
/// <param name="key">The 256-bit key containing a 128-bit data key followed by a 128-bit tweak key.</param>
public void CreateFile(string path, long size, CreateFileOptions options, byte[] key)
{
long containerSize = AesXtsFile.HeaderLength + Util.AlignUp(size, 0x10);
BaseFileSystem.CreateFile(path, containerSize, options);
var header = new AesXtsFileHeader(key, size, path, KekSource, ValidationKey);
using (IFile baseFile = BaseFileSystem.OpenFile(path, OpenMode.Write))
{
baseFile.Write(header.ToBytes(false), 0);
}
}
public AesXtsFile(OpenMode mode, IFile baseFile, string path, ReadOnlySpan <byte> kekSeed, ReadOnlySpan <byte> verificationKey, int blockSize)
{
Mode = mode;
BaseFile = baseFile;
Path = path;
KekSeed = kekSeed.ToArray();
VerificationKey = verificationKey.ToArray();
BlockSize = blockSize;
Header = new AesXtsFileHeader(BaseFile);
if (!Header.TryDecryptHeader(Path, KekSeed, VerificationKey))
{
throw new ArgumentException("NAX0 key derivation failed.");
}
IStorage encStorage = BaseFile.AsStorage().Slice(HeaderLength, Util.AlignUp(Header.Size, 0x10));
BaseStorage = new CachedStorage(new Aes128XtsStorage(encStorage, Header.DecryptedKey1, Header.DecryptedKey2, BlockSize, true), 4, true);
}
public void RenameFile(string srcPath, string dstPath)
{
srcPath = PathTools.Normalize(srcPath);
dstPath = PathTools.Normalize(dstPath);
AesXtsFileHeader header = ReadXtsHeader(srcPath, srcPath);
BaseFileSystem.RenameFile(srcPath, dstPath);
try
{
WriteXtsHeader(header, dstPath, dstPath);
}
catch (Exception)
{
BaseFileSystem.RenameFile(dstPath, srcPath);
WriteXtsHeader(header, srcPath, srcPath);
throw;
}
}