private void InitializeWithPresetKeys(byte[] vkey, byte[] header_key, byte[] body_key, int cipher_type)
{
VersionKey = vkey;
HeaderKey = header_key;
BodyKey = body_key;
CipherType = cipher_type;
_headerBaseStream = new MemoryStream();
_bodyBaseStream = new MemoryStream();
_headerStream = new BBCipherStream(_headerBaseStream, HeaderKey, VersionKey, 0, cipher_type);
_bodyStream = new BBCipherStream(_bodyBaseStream, BodyKey, VersionKey, 0, cipher_type);
}
private void Initialize()
{
using (var br = new BinaryReader(_baseStream, Encoding.ASCII, true))
{
br.BaseStream.Position = 3;
var version = br.ReadByte();
_pgd_flag = version == 0x40 ? 1 : version == 0x44 ? 2 : throw new InvalidDataException($"Invalid PGD version: 0x{version:X2}");
//Set key index
br.BaseStream.Position = 4;
var key_index = br.ReadInt32();
//Set types and definitions
br.BaseStream.Position = 8;
var drm_type = br.ReadInt32();
int mac_type = 0;
if (drm_type == 1)
{
mac_type = 1;
_pgd_flag |= 4;
if (key_index > 1)
{
mac_type = 3;
_pgd_flag |= 8;
}
CipherType = 1;
}
else
{
mac_type = 2;
CipherType = 2;
}
GetVersionKey(mac_type);
GetHeaderKey();
_headerStream = new BBCipherStream(_baseStream, 0x30, 0x30, HeaderKey, VersionKey, 0, CipherType);
GetBodyKey();
_bodyStream = new BBCipherStream(_baseStream, 0x90, _baseStream.Length - 0x90, BodyKey, VersionKey, 0, CipherType);
}
}