public AesXtsFile(OpenMode mode, IFile baseFile, U8String 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);
baseFile.GetSize(out long fileSize).ThrowIfFailure();
if (!Header.TryDecryptHeader(Path.ToString(), KekSeed, VerificationKey))
{
ThrowHelper.ThrowResult(ResultFs.AesXtsFileHeaderInvalidKeys.Value, "NAX0 key derivation failed.");
}
if (HeaderLength + Utilities.AlignUp(Header.Size, 0x10) > fileSize)
{
ThrowHelper.ThrowResult(ResultFs.AesXtsFileTooShort.Value, "NAX0 key derivation failed.");
}
var fileStorage = new FileStorage2(baseFile);
var encStorage = new SubStorage(fileStorage, HeaderLength, fileSize - HeaderLength);
encStorage.SetResizable(true);
BaseStorage = new CachedStorage(new Aes128XtsStorage(encStorage, Header.DecryptedKey1, Header.DecryptedKey2, BlockSize, true), 4, true);
}
public Result OpenContentStorageFileSystem(out IFileSystem fileSystem, ContentStorageId storageId)
{
fileSystem = default;
U8String contentDirPath = default;
IFileSystem baseFileSystem = default;
bool isEncrypted = false;
Result rc;
switch (storageId)
{
case ContentStorageId.System:
rc = OpenBisFileSystem(out baseFileSystem, string.Empty, BisPartitionId.System);
contentDirPath = $"/{ContentDirectoryName}".ToU8String();
break;
case ContentStorageId.User:
rc = OpenBisFileSystem(out baseFileSystem, string.Empty, BisPartitionId.User);
contentDirPath = $"/{ContentDirectoryName}".ToU8String();
break;
case ContentStorageId.SdCard:
rc = OpenSdCardFileSystem(out baseFileSystem);
contentDirPath = $"/{NintendoDirectoryName}/{ContentDirectoryName}".ToU8String();
isEncrypted = true;
break;
default:
rc = ResultFs.InvalidArgument.Log();
break;
}
if (rc.IsFailure())
{
return(rc);
}
rc = baseFileSystem.EnsureDirectoryExists(contentDirPath.ToString());
if (rc.IsFailure())
{
return(rc);
}
rc = FsCreators.SubDirectoryFileSystemCreator.Create(out IFileSystem subDirFileSystem,
baseFileSystem, contentDirPath);
if (rc.IsFailure())
{
return(rc);
}
if (!isEncrypted)
{
fileSystem = subDirFileSystem;
return(Result.Success);
}
return(FsCreators.EncryptedFileSystemCreator.Create(out fileSystem, subDirFileSystem,
EncryptedFsKeyId.Content, SdEncryptionSeed));
}