public static void DecryptXCI(Stream input, byte[] xci_header_key)
{
if (!input.CanWrite)
{
throw new Exception("File not writeable. Is it open somewhere?");
}
if (!SHA256.Create(xci_header_key).SequenceEqual(xci_sha256))
{
throw new InvalidDataException("The given XCI Header Key is wrong.");
}
using (var bw = new BinaryWriterX(input, true))
using (var br = new BinaryReaderX(input, true))
{
//Decrypt XCI Header
br.BaseStream.Position = 0x120;
var iv = br.ReadBytes(0x10).Reverse().ToArray();
br.BaseStream.Position = 0x190;
var encrypted_xci_header = br.ReadBytes(0x70);
bw.BaseStream.Position = 0x190;
bw.Write(Decryption.CBC128(encrypted_xci_header, xci_header_key, iv));
//Get HFS0 entries for NCA's
br.BaseStream.Position = 0x130;
var hfs0_offset = br.ReadInt64();
var hfs0_header_size = br.ReadInt64();
var ncaEntries = ParseHFS0List(br.BaseStream, hfs0_offset);
//Decrypt NCA's
foreach (var entry in ncaEntries)
{
if (entry.name.Contains(".nca"))
{
DecryptNCA(input, entry.entry.offset);
}
}
}
}
public static void DecryptXCI(Stream input)
{
if (!input.CanWrite)
{
throw new Exception("File not writeable. Is it open somewhere?");
}
var keyset = new Keyset();
using (var bw = new BinaryWriterX(input, true))
using (var br = new BinaryReaderX(input, true))
{
//Decrypt XCI Header
br.BaseStream.Position = 0x120;
var iv = br.ReadBytes(0x10).Reverse().ToArray();
br.BaseStream.Position = 0x190;
var encrypted_xci_header = br.ReadBytes(0x70);
bw.BaseStream.Position = 0x190;
bw.Write(Decryption.CBC128(encrypted_xci_header, keyset["xci_header_key"], iv));
//Get HFS0 entries for NCA's
br.BaseStream.Position = 0x130;
var hfs0_offset = br.ReadInt64();
var hfs0_header_size = br.ReadInt64();
var ncaEntries = ParseHFS0List(br.BaseStream, hfs0_offset);
//Decrypt NCA's
foreach (var entry in ncaEntries)
{
if (entry.name.Contains(".nca"))
{
DecryptNCA(input, entry.entry.offset, keyset);
}
}
}
}