private int FindKeyGeneration(Keyset keyset, Stream stream)
{
var counter = new byte[0x10];
var decBuffer = new byte[0x10];
stream.Position = 0x100;
stream.Read(counter, 0, 0x10);
for (int i = 0; i < 0x20; i++)
{
var dec = new Aes128CtrStream(stream, keyset.Package2Keys[i], 0x100, 0x100, counter);
dec.Position = 0x50;
dec.Read(decBuffer, 0, 0x10);
if (BitConverter.ToUInt32(decBuffer, 0) == Pk21Magic)
{
stream.Position = 0;
return(i);
}
}
throw new InvalidDataException("Failed to decrypt package2! Is the correct key present?");
}
public Package1(Keyset keyset, Stream stream)
{
StreamSource = new SharedStreamSource(stream);
var reader = new BinaryReader(stream);
BuildHash = reader.ReadBytes(0x10);
BuildDate = reader.ReadAscii(0xE);
Field1E = reader.ReadUInt16();
reader.BaseStream.Position = 0x3FE0;
Pk11Size = reader.ReadInt32();
reader.BaseStream.Position += 0xC;
Counter = reader.ReadBytes(0x10);
// Try decrypting the PK11 blob with all known package1 keys
Stream encStream = StreamSource.CreateStream(0x4000, Pk11Size);
var decBuffer = new byte[0x10];
for (int i = 0; i < 0x20; i++)
{
var dec = new Aes128CtrStream(encStream, keyset.Package1Keys[i], Counter);
dec.Read(decBuffer, 0, 0x10);
if (BitConverter.ToUInt32(decBuffer, 0) == Pk11Magic)
{
KeyRevision = i;
dec.Position = 0;
Pk11 = new Pk11(new RandomAccessSectorStream(dec));
return;
}
}
throw new InvalidDataException("Failed to decrypt PK11! Is the correct key present?");
}
