// Copyright 2008 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <cstddef>
#include <cstring>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include <mbedtls/aes.h>
#include "Common/CommonTypes.h"
#include "Common/Logging/Log.h"
#include "Common/StringUtil.h"
#include "DiscIO/Blob.h"
#include "DiscIO/Volume.h"
#include "DiscIO/VolumeCreator.h"
#include "DiscIO/VolumeDirectory.h"
#include "DiscIO/VolumeGC.h"
#include "DiscIO/VolumeWad.h"
#include "DiscIO/VolumeWiiCrypted.h"
namespace DiscIO
{
enum EDiscType
{
DISC_TYPE_UNK,
DISC_TYPE_WII,
DISC_TYPE_WII_CONTAINER,
DISC_TYPE_GC,
DISC_TYPE_WAD
};
static const unsigned char s_master_key[16] = {0xeb, 0xe4, 0x2a, 0x22, 0x5e, 0x85, 0x93, 0xe4,
0x48, 0xd9, 0xc5, 0x45, 0x73, 0x81, 0xaa, 0xf7};
static const unsigned char s_master_key_korean[16] = {
0x63, 0xb8, 0x2b, 0xb4, 0xf4, 0x61, 0x4e, 0x2e, 0x13, 0xf2, 0xfe, 0xfb, 0xba, 0x4c, 0x9b, 0x7e};
static std::unique_ptr<IVolume> CreateVolumeFromCryptedWiiImage(std::unique_ptr<IBlobReader> reader,
u32 partition_group,
u32 volume_type, u32 volume_number);
EDiscType GetDiscType(IBlobReader& _rReader);
std::unique_ptr<IVolume> CreateVolumeFromFilename(const std::string& filename, u32 partition_group,
u32 volume_number)
{
std::unique_ptr<IBlobReader> reader(CreateBlobReader(filename));
if (reader == nullptr)
return nullptr;
switch (GetDiscType(*reader))
{
case DISC_TYPE_WII:
case DISC_TYPE_GC:
return std::make_unique<CVolumeGC>(std::move(reader));
case DISC_TYPE_WAD:
return std::make_unique<CVolumeWAD>(std::move(reader));
case DISC_TYPE_WII_CONTAINER:
return CreateVolumeFromCryptedWiiImage(std::move(reader), partition_group, 0, volume_number);
case DISC_TYPE_UNK:
default:
std::string name, extension;
SplitPath(filename, nullptr, &name, &extension);
name += extension;
NOTICE_LOG(DISCIO,
"%s does not have the Magic word for a gcm, wiidisc or wad file\n"
"Set Log Verbosity to Warning and attempt to load the game again to view the values",
name.c_str());
}
return nullptr;
}
std::unique_ptr<IVolume> CreateVolumeFromDirectory(const std::string& directory, bool is_wii,
const std::string& apploader,
const std::string& dol)
{
if (CVolumeDirectory::IsValidDirectory(directory))
return std::make_unique<CVolumeDirectory>(directory, is_wii, apploader, dol);
return nullptr;
}
void VolumeKeyForPartition(IBlobReader& _rReader, u64 offset, u8* VolumeKey)
{
u8 SubKey[16];
_rReader.Read(offset + 0x1bf, 16, SubKey);
u8 IV[16];
memset(IV, 0, 16);
_rReader.Read(offset + 0x44c, 8, IV);
// Issue: 6813
// Magic value is at partition's offset + 0x1f1 (1byte)
// If encrypted with the Korean key, the magic value would be 1
// Otherwise it is zero
u8 using_korean_key = 0;
_rReader.Read(offset + 0x1f1, sizeof(u8), &using_korean_key);
u8 region = 0;
_rReader.Read(0x3, sizeof(u8), ®ion);
mbedtls_aes_context AES_ctx;
mbedtls_aes_setkey_dec(
&AES_ctx, (using_korean_key == 1 && region == 'K' ? s_master_key_korean : s_master_key), 128);
mbedtls_aes_crypt_cbc(&AES_ctx, MBEDTLS_AES_DECRYPT, 16, IV, SubKey, VolumeKey);
}
static std::unique_ptr<IVolume> CreateVolumeFromCryptedWiiImage(std::unique_ptr<IBlobReader> reader,
u32 partition_group,
u32 volume_type, u32 volume_number)
{
CBlobBigEndianReader big_endian_reader(*reader);
u32 num_partitions;
if (!big_endian_reader.ReadSwapped(0x40000 + (partition_group * 8), &num_partitions))
return nullptr;
// Check if we're looking for a valid partition
if ((int)volume_number != -1 && volume_number > num_partitions)
return nullptr;
u32 partitions_offset_unshifted;
if (!big_endian_reader.ReadSwapped(0x40000 + (partition_group * 8) + 4,
&partitions_offset_unshifted))
return nullptr;
u64 partitions_offset = (u64)partitions_offset_unshifted << 2;
struct SPartition
{
SPartition(u64 offset_, u32 type_) : offset(offset_), type(type_) {}
u64 offset;
u32 type;
};
struct SPartitionGroup
{
u32 num_partitions;
u64 partitions_offset;
std::vector<SPartition> partitions;
};
SPartitionGroup partition_groups[4];
// Read all partitions
for (SPartitionGroup& group : partition_groups)
{
for (u32 i = 0; i < num_partitions; i++)
{
u32 partition_offset, partition_type;
if (big_endian_reader.ReadSwapped(partitions_offset + (i * 8) + 0, &partition_offset) &&
big_endian_reader.ReadSwapped(partitions_offset + (i * 8) + 4, &partition_type))
{
group.partitions.emplace_back((u64)partition_offset << 2, partition_type);
}
}
}
// Return the partition type specified or number
// types: 0 = game, 1 = firmware update, 2 = channel installer
// some partitions on SSBB use the ASCII title id of the demo VC game they hold...
for (size_t i = 0; i < partition_groups[partition_group].partitions.size(); i++)
{
const SPartition& partition = partition_groups[partition_group].partitions.at(i);
if ((partition.type == volume_type && (int)volume_number == -1) || i == volume_number)
{
u8 volume_key[16];
VolumeKeyForPartition(*reader, partition.offset, volume_key);
return std::make_unique<CVolumeWiiCrypted>(std::move(reader), partition.offset, volume_key);
}
}
return nullptr;
}
EDiscType GetDiscType(IBlobReader& _rReader)
{
CBlobBigEndianReader Reader(_rReader);
// Check for Wii
u32 WiiMagic = 0;
Reader.ReadSwapped(0x18, &WiiMagic);
u32 WiiContainerMagic = 0;
Reader.ReadSwapped(0x60, &WiiContainerMagic);
if (WiiMagic == 0x5D1C9EA3 && WiiContainerMagic != 0)
return DISC_TYPE_WII;
if (WiiMagic == 0x5D1C9EA3 && WiiContainerMagic == 0)
return DISC_TYPE_WII_CONTAINER;
// Check for WAD
// 0x206962 for boot2 wads
u32 WADMagic = 0;
Reader.ReadSwapped(0x02, &WADMagic);
if (WADMagic == 0x00204973 || WADMagic == 0x00206962)
return DISC_TYPE_WAD;
// Check for GC
u32 GCMagic = 0;
Reader.ReadSwapped(0x1C, &GCMagic);
if (GCMagic == 0xC2339F3D)
return DISC_TYPE_GC;
WARN_LOG(DISCIO, "No known magic words found");
WARN_LOG(DISCIO, "Wii offset: 0x18 value: 0x%08x", WiiMagic);
WARN_LOG(DISCIO, "WiiC offset: 0x60 value: 0x%08x", WiiContainerMagic);
WARN_LOG(DISCIO, "WAD offset: 0x02 value: 0x%08x", WADMagic);
WARN_LOG(DISCIO, "GC offset: 0x1C value: 0x%08x", GCMagic);
return DISC_TYPE_UNK;
}
} // namespace