private static Modulus LoadKey(string file, ushort header, bool loadModulus, bool loadEncKey, bool loadDecKey, bool loadXOrKey)
{
var key = new Modulus();
using (var f = File.OpenRead(file))
{
var fheader = Serializer.Deserialize <ENCDEC_FILEHEADER>(f);
if (fheader.sFileHeader != header)
{
throw new Exception("Invalid file format");
}
var Size = 6;
Size += loadModulus ? 16 : 0;
Size += loadEncKey ? 16 : 0;
Size += loadDecKey ? 16 : 0;
Size += loadXOrKey ? 16 : 0;
if (fheader.Size != Size)
{
throw new ArgumentException("Invalid file size");
}
var temp = new byte[16];
if (loadModulus)
{
f.Read(temp, 0, 16);
for (var i = 0; i < 4; i++)
{
key.modulus[i] = s_saveLoadXor[i] ^ BitConverter.ToUInt32(temp, i * 4);
}
}
if (loadEncKey)
{
f.Read(temp, 0, 16);
for (var i = 0; i < 4; i++)
{
key.encryptionKey[i] = s_saveLoadXor[i] ^ BitConverter.ToUInt32(temp, i * 4);
}
}
if (loadDecKey)
{
f.Read(temp, 0, 16);
for (var i = 0; i < 4; i++)
{
key.decryptionKey[i] = s_saveLoadXor[i] ^ BitConverter.ToUInt32(temp, i * 4);
}
}
if (loadXOrKey)
{
f.Read(temp, 0, 16);
for (var i = 0; i < 4; i++)
{
key.xor[i] = s_saveLoadXor[i] ^ BitConverter.ToUInt32(temp, i * 4);
}
}
}
return(key);
}
public static void LoadDecryptionKey(string file)
{
s_dec = LoadKey(file, 4370, true, false, true, true);
}