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// Copyright (C) 2003-2008 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include <vector>
#include "AES/aes.h"
#include "VolumeCreator.h"
#include "Volume.h"
#include "VolumeGC.h"
#include "VolumeWiiCrypted.h"
#include "Hash.h"
namespace DiscIO
{
enum EDiscType
{
DISC_TYPE_UNK,
DISC_TYPE_WII,
DISC_TYPE_WII_CONTAINER,
DISC_TYPE_GC
};
#ifndef _WIN32
struct SPartition
{
u64 Offset;
u32 Type;
}; //gcc 4.3 cries if it's local
#endif
class CBlobBigEndianReader
{
public:
CBlobBigEndianReader(IBlobReader& _rReader) : m_rReader(_rReader) {}
u32 Read32(u64 _Offset)
{
u32 Temp;
m_rReader.Read(_Offset, 4, (u8*)&Temp);
return(Common::swap32(Temp));
}
private:
IBlobReader& m_rReader;
};
unsigned char g_MasterKey[16];
bool g_MasterKeyInit = false;
IVolume* CreateVolumeFromCryptedWiiImage(IBlobReader& _rReader, u32 _VolumeType);
EDiscType GetDiscType(IBlobReader& _rReader);
IVolume* CreateVolumeFromFilename(const std::string& _rFilename)
{
IBlobReader* pReader = CreateBlobReader(_rFilename.c_str());
if (pReader == NULL)
return NULL;
switch (GetDiscType(*pReader))
{
case DISC_TYPE_WII:
case DISC_TYPE_GC:
return(new CVolumeGC(pReader));
case DISC_TYPE_WII_CONTAINER:
{
IVolume* pVolume = CreateVolumeFromCryptedWiiImage(*pReader, 0);
if (pVolume == NULL)
{
delete pReader;
}
return(pVolume);
}
break;
case DISC_TYPE_UNK:
default:
delete pReader;
return NULL;
}
// unreachable code
return NULL;
}
bool IsVolumeWiiDisc(const IVolume *_rVolume)
{
u32 MagicWord = 0;
_rVolume->Read(0x18, 4, (u8*)&MagicWord);
return (Common::swap32(MagicWord) == 0x5D1C9EA3);
}
IVolume* CreateVolumeFromCryptedWiiImage(IBlobReader& _rReader, u32 _VolumeType)
{
if (!g_MasterKeyInit)
{
FILE* pT = fopen("WII/masterkey.bin", "rb");
if (pT == NULL)
{
PanicAlert("Can't open WII/masterkey.bin");
return NULL;
}
fread(g_MasterKey, 16, 1, pT);
fclose(pT);
const u32 keyhash = 0x4bc30936;
u32 hash = HashAdler32(g_MasterKey, 16);
if (hash != keyhash)
PanicAlert("Your Wii disc decryption key is bad.", keyhash, hash);
else
g_MasterKeyInit = true;
}
CBlobBigEndianReader Reader(_rReader);
u32 numPartitions = Reader.Read32(0x40000);
u64 PartitionsOffset = (u64)Reader.Read32(0x40004) << 2;
#ifdef _WIN32
struct SPartition
{
u64 Offset;
u32 Type;
};
#endif
std::vector<SPartition> PartitionsVec;
// read all partitions
for (u32 i = 0; i < numPartitions; i++)
{
SPartition Partition;
Partition.Offset = ((u64)Reader.Read32(PartitionsOffset + (i * 8) + 0)) << 2;
Partition.Type = Reader.Read32(PartitionsOffset + (i * 8) + 4);
PartitionsVec.push_back(Partition);
}
// find the partition with the game... type == 1 is prolly the firmware update partition
for (size_t i = 0; i < PartitionsVec.size(); i++)
{
const SPartition& rPartition = PartitionsVec[i];
if (rPartition.Type == _VolumeType)
{
u8 SubKey[16];
_rReader.Read(rPartition.Offset + 0x1bf, 16, SubKey);
u8 IV[16];
memset(IV, 0, 16);
_rReader.Read(rPartition.Offset + 0x44c, 8, IV);
AES_KEY AES_KEY;
AES_set_decrypt_key(g_MasterKey, 128, &AES_KEY);
u8 VolumeKey[16];
AES_cbc_encrypt(SubKey, VolumeKey, 16, &AES_KEY, IV, AES_DECRYPT);
return new CVolumeWiiCrypted(&_rReader, rPartition.Offset + 0x20000, VolumeKey);
}
}
return NULL;
}
EDiscType GetDiscType(IBlobReader& _rReader)
{
CBlobBigEndianReader Reader(_rReader);
// check for wii
{
u32 MagicWord = Reader.Read32(0x18);
if (MagicWord == 0x5D1C9EA3)
{
if (Reader.Read32(0x60) != 0)
return(DISC_TYPE_WII);
else
return(DISC_TYPE_WII_CONTAINER);
}
}
// check for GC
{
u32 MagicWord = Reader.Read32(0x1C);
if (MagicWord == 0xC2339F3D)
return(DISC_TYPE_GC);
}
return DISC_TYPE_UNK;
}
} // namespace
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