public XciHeader(KeySet keySet, Stream stream)
{
using (var reader = new BinaryReader(stream, Encoding.Default, true))
{
Signature = reader.ReadBytes(SignatureSize);
Magic = reader.ReadAscii(4);
if (Magic != HeaderMagic)
{
throw new InvalidDataException("Invalid XCI file: Header magic invalid.");
}
reader.BaseStream.Position = SignatureSize;
byte[] sigData = reader.ReadBytes(SignatureSize);
reader.BaseStream.Position = SignatureSize + 4;
SignatureValidity = CryptoOld.Rsa2048Pkcs1Verify(sigData, Signature, _xciHeaderPubk);
RomAreaStartPage = reader.ReadInt32();
BackupAreaStartPage = reader.ReadInt32();
byte keyIndex = reader.ReadByte();
KekIndex = (byte)(keyIndex >> 4);
TitleKeyDecIndex = (byte)(keyIndex & 7);
GameCardSize = (GameCardSizeInternal)reader.ReadByte();
CardHeaderVersion = reader.ReadByte();
Flags = (GameCardAttribute)reader.ReadByte();
PackageId = reader.ReadUInt64();
ValidDataEndPage = reader.ReadInt64();
AesCbcIv = reader.ReadBytes(Aes.KeySize128);
Array.Reverse(AesCbcIv);
RootPartitionOffset = reader.ReadInt64();
RootPartitionHeaderSize = reader.ReadInt64();
RootPartitionHeaderHash = reader.ReadBytes(Sha256.DigestSize);
InitialDataHash = reader.ReadBytes(Sha256.DigestSize);
SelSec = reader.ReadInt32();
SelT1Key = reader.ReadInt32();
SelKey = reader.ReadInt32();
LimAreaPage = reader.ReadInt32();
if (keySet != null && !keySet.XciHeaderKey.IsZeros())
{
byte[] encHeader = reader.ReadBytes(EncryptedHeaderSize);
byte[] decHeader = new byte[EncryptedHeaderSize];
Aes.DecryptCbc128(encHeader, decHeader, keySet.XciHeaderKey, AesCbcIv);
using (var decReader = new BinaryReader(new MemoryStream(decHeader)))
{
FwVersion = decReader.ReadUInt64();
AccCtrl1 = (CardClockRate)decReader.ReadInt32();
Wait1TimeRead = decReader.ReadInt32();
Wait2TimeRead = decReader.ReadInt32();
Wait1TimeWrite = decReader.ReadInt32();
Wait2TimeWrite = decReader.ReadInt32();
FwMode = decReader.ReadInt32();
UppVersion = decReader.ReadInt32();
decReader.BaseStream.Position += 4;
UppHash = decReader.ReadBytes(8);
UppId = decReader.ReadUInt64();
}
}
ImageHash = new byte[Sha256.DigestSize];
Sha256.GenerateSha256Hash(sigData, ImageHash);
reader.BaseStream.Position = RootPartitionOffset;
byte[] headerBytes = reader.ReadBytes((int)RootPartitionHeaderSize);
Span <byte> actualHeaderHash = stackalloc byte[Sha256.DigestSize];
Sha256.GenerateSha256Hash(headerBytes, actualHeaderHash);
PartitionFsHeaderValidity = Utilities.SpansEqual(RootPartitionHeaderHash, actualHeaderHash) ? Validity.Valid : Validity.Invalid;
}
}