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 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)); } }
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); }