dolphin/Source/Core/DiscIO/VolumeWiiCrypted.cpp

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// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#include "VolumeWiiCrypted.h"
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#include "VolumeGC.h"
#include "StringUtil.h"
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#include <polarssl/sha1.h>
namespace DiscIO
{
CVolumeWiiCrypted::CVolumeWiiCrypted(IBlobReader* _pReader, u64 _VolumeOffset,
const unsigned char* _pVolumeKey)
: m_pReader(_pReader),
m_pBuffer(0),
m_VolumeOffset(_VolumeOffset),
dataOffset(0x20000),
m_LastDecryptedBlockOffset(-1)
{
m_AES_ctx = new aes_context;
aes_setkey_dec(m_AES_ctx, _pVolumeKey, 128);
m_pBuffer = new u8[0x8000];
}
CVolumeWiiCrypted::~CVolumeWiiCrypted()
{
delete m_pReader; // is this really our responsibility?
m_pReader = NULL;
delete[] m_pBuffer;
m_pBuffer = NULL;
delete m_AES_ctx;
m_AES_ctx = NULL;
}
bool CVolumeWiiCrypted::RAWRead( u64 _Offset, u64 _Length, u8* _pBuffer ) const
{
// HyperIris: hack for DVDLowUnencryptedRead
// Medal Of Honor Heroes 2 read this DVD offset for PartitionsInfo
// and, PartitionsInfo is not encrypted, let's read it directly.
if (!m_pReader->Read(_Offset, _Length, _pBuffer))
{
return(false);
}
return true;
}
bool CVolumeWiiCrypted::Read(u64 _ReadOffset, u64 _Length, u8* _pBuffer) const
{
if (m_pReader == NULL)
{
return(false);
}
while (_Length > 0)
{
static unsigned char IV[16];
// math block offset
u64 Block = _ReadOffset / 0x7C00;
u64 Offset = _ReadOffset % 0x7C00;
// read current block
if (!m_pReader->Read(m_VolumeOffset + dataOffset + Block * 0x8000, 0x8000, m_pBuffer))
{
return(false);
}
if (m_LastDecryptedBlockOffset != Block)
{
memcpy(IV, m_pBuffer + 0x3d0, 16);
aes_crypt_cbc(m_AES_ctx, AES_DECRYPT, 0x7C00, IV, m_pBuffer + 0x400, m_LastDecryptedBlock);
m_LastDecryptedBlockOffset = Block;
}
// copy the encrypted data
u64 MaxSizeToCopy = 0x7C00 - Offset;
u64 CopySize = (_Length > MaxSizeToCopy) ? MaxSizeToCopy : _Length;
memcpy(_pBuffer, &m_LastDecryptedBlock[Offset], (size_t)CopySize);
// increase buffers
_Length -= CopySize;
_pBuffer += CopySize;
_ReadOffset += CopySize;
}
return(true);
}
bool CVolumeWiiCrypted::GetTitleID(u8* _pBuffer) const
{
// Tik is at m_VolumeOffset size 0x2A4
// TitleID offset in tik is 0x1DC
return RAWRead(m_VolumeOffset + 0x1DC, 8, _pBuffer);
}
void CVolumeWiiCrypted::GetTMD(u8* _pBuffer, u32 * _sz) const
{
*_sz = 0;
u32 tmdSz,
tmdAddr;
RAWRead(m_VolumeOffset + 0x2a4, sizeof(u32), (u8*)&tmdSz);
RAWRead(m_VolumeOffset + 0x2a8, sizeof(u32), (u8*)&tmdAddr);
tmdSz = Common::swap32(tmdSz);
tmdAddr = Common::swap32(tmdAddr) << 2;
RAWRead(m_VolumeOffset + tmdAddr, tmdSz, _pBuffer);
*_sz = tmdSz;
}
std::string CVolumeWiiCrypted::GetUniqueID() const
{
if (m_pReader == NULL)
{
return std::string();
}
char ID[7];
if (!Read(0, 6, (u8*)ID))
{
return std::string();
}
ID[6] = '\0';
return ID;
}
IVolume::ECountry CVolumeWiiCrypted::GetCountry() const
{
if (!m_pReader)
return COUNTRY_UNKNOWN;
u8 CountryCode;
m_pReader->Read(3, 1, &CountryCode);
return CountrySwitch(CountryCode);
}
std::string CVolumeWiiCrypted::GetMakerID() const
{
if (m_pReader == NULL)
{
return std::string();
}
char makerID[3];
if (!Read(0x4, 0x2, (u8*)&makerID))
{
return std::string();
}
makerID[2] = '\0';
return makerID;
}
std::vector<std::string> CVolumeWiiCrypted::GetNames() const
{
std::vector<std::string> names;
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auto const string_decoder = CVolumeGC::GetStringDecoder(GetCountry());
char name[0xFF] = {};
if (m_pReader != NULL && Read(0x20, 0x60, (u8*)&name))
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names.push_back(string_decoder(name));
return names;
}
u32 CVolumeWiiCrypted::GetFSTSize() const
{
if (m_pReader == NULL)
{
return 0;
}
u32 size;
if (!Read(0x428, 0x4, (u8*)&size))
{
return 0;
}
return size;
}
std::string CVolumeWiiCrypted::GetApploaderDate() const
{
if (m_pReader == NULL)
{
return std::string();
}
char date[16];
if (!Read(0x2440, 0x10, (u8*)&date))
{
return std::string();
}
date[10] = '\0';
return date;
}
u64 CVolumeWiiCrypted::GetSize() const
{
if (m_pReader)
{
return m_pReader->GetDataSize();
}
else
{
return 0;
}
}
u64 CVolumeWiiCrypted::GetRawSize() const
{
if (m_pReader)
{
return m_pReader->GetRawSize();
}
else
{
return 0;
}
}
bool CVolumeWiiCrypted::CheckIntegrity() const
{
// Get partition data size
u32 partSizeDiv4;
RAWRead(m_VolumeOffset + 0x2BC, 4, (u8*)&partSizeDiv4);
u64 partDataSize = (u64)Common::swap32(partSizeDiv4) * 4;
u32 nClusters = (u32)(partDataSize / 0x8000);
for (u32 clusterID = 0; clusterID < nClusters; ++clusterID)
{
u64 clusterOff = m_VolumeOffset + dataOffset + (u64)clusterID * 0x8000;
// Read and decrypt the cluster metadata
u8 clusterMDCrypted[0x400];
u8 clusterMD[0x400];
u8 IV[16] = { 0 };
if (!m_pReader->Read(clusterOff, 0x400, clusterMDCrypted))
{
NOTICE_LOG(DISCIO, "Integrity Check: fail at cluster %d: could not read metadata", clusterID);
return false;
}
aes_crypt_cbc(m_AES_ctx, AES_DECRYPT, 0x400, IV, clusterMDCrypted, clusterMD);
// Some clusters have invalid data and metadata because they aren't
// meant to be read by the game (for example, holes between files). To
// try to avoid reporting errors because of these clusters, we check
// the 0x00 paddings in the metadata.
//
// This may cause some false negatives though: some bad clusters may be
// skipped because they are *too* bad and are not even recognized as
// valid clusters. To be improved.
bool meaningless = false;
for (u32 idx = 0x26C; idx < 0x280; ++idx)
if (clusterMD[idx] != 0)
meaningless = true;
if (meaningless)
continue;
u8 clusterData[0x7C00];
if (!Read((u64)clusterID * 0x7C00, 0x7C00, clusterData))
{
NOTICE_LOG(DISCIO, "Integrity Check: fail at cluster %d: could not read data", clusterID);
return false;
}
for (u32 hashID = 0; hashID < 31; ++hashID)
{
u8 hash[20];
sha1(clusterData + hashID * 0x400, 0x400, hash);
// Note that we do not use strncmp here
if (memcmp(hash, clusterMD + hashID * 20, 20))
{
NOTICE_LOG(DISCIO, "Integrity Check: fail at cluster %d: hash %d is invalid", clusterID, hashID);
return false;
}
}
}
return true;
}
} // namespace