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dolphin/Source/Core/DiscIO/VolumeWii.cpp

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// Copyright 2008 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "DiscIO/VolumeWii.h"
#include <algorithm>
#include <array>
#include <cstddef>
#include <cstring>
#include <future>
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <thread>
#include <utility>
#include <vector>
#include "Common/Align.h"
#include "Common/Assert.h"
#include "Common/CommonTypes.h"
#include "Common/Crypto/AES.h"
#include "Common/Crypto/SHA1.h"
#include "Common/Logging/Log.h"
#include "Common/Swap.h"
#include "DiscIO/Blob.h"
#include "DiscIO/DiscExtractor.h"
#include "DiscIO/DiscUtils.h"
#include "DiscIO/Enums.h"
#include "DiscIO/FileSystemGCWii.h"
#include "DiscIO/Filesystem.h"
#include "DiscIO/Volume.h"
#include "DiscIO/WiiSaveBanner.h"
namespace DiscIO
{
VolumeWii::VolumeWii(std::unique_ptr<BlobReader> reader)
: m_reader(std::move(reader)), m_game_partition(PARTITION_NONE),
m_last_decrypted_block(UINT64_MAX)
{
ASSERT(m_reader);
m_has_hashes = m_reader->ReadSwapped<u8>(0x60) == u8(0);
m_has_encryption = m_reader->ReadSwapped<u8>(0x61) == u8(0);
if (m_has_encryption && !m_has_hashes)
ERROR_LOG_FMT(DISCIO, "Wii disc has encryption but no hashes! This probably won't work well");
for (u32 partition_group = 0; partition_group < 4; ++partition_group)
{
const std::optional<u32> number_of_partitions =
m_reader->ReadSwapped<u32>(0x40000 + (partition_group * 8));
if (!number_of_partitions)
continue;
const std::optional<u64> partition_table_offset =
ReadSwappedAndShifted(0x40000 + (partition_group * 8) + 4, PARTITION_NONE);
if (!partition_table_offset)
continue;
for (u32 i = 0; i < number_of_partitions; i++)
{
const std::optional<u64> partition_offset =
ReadSwappedAndShifted(*partition_table_offset + (i * 8), PARTITION_NONE);
if (!partition_offset)
continue;
const Partition partition(*partition_offset);
const std::optional<u32> partition_type =
m_reader->ReadSwapped<u32>(*partition_table_offset + (i * 8) + 4);
if (!partition_type)
continue;
// If this is the game partition, set m_game_partition
if (m_game_partition == PARTITION_NONE && *partition_type == 0)
m_game_partition = partition;
auto get_ticket = [this, partition]() -> IOS::ES::TicketReader {
std::vector<u8> ticket_buffer(sizeof(IOS::ES::Ticket));
if (!m_reader->Read(partition.offset, ticket_buffer.size(), ticket_buffer.data()))
return INVALID_TICKET;
return IOS::ES::TicketReader{std::move(ticket_buffer)};
};
auto get_tmd = [this, partition]() -> IOS::ES::TMDReader {
const std::optional<u32> tmd_size =
m_reader->ReadSwapped<u32>(partition.offset + WII_PARTITION_TMD_SIZE_ADDRESS);
const std::optional<u64> tmd_address = ReadSwappedAndShifted(
partition.offset + WII_PARTITION_TMD_OFFSET_ADDRESS, PARTITION_NONE);
if (!tmd_size || !tmd_address)
return INVALID_TMD;
if (!IOS::ES::IsValidTMDSize(*tmd_size))
{
// This check is normally done by ES in ES_DiVerify, but that would happen too late
// (after allocating the buffer), so we do the check here.
ERROR_LOG_FMT(DISCIO, "Invalid TMD size");
return INVALID_TMD;
}
std::vector<u8> tmd_buffer(*tmd_size);
if (!m_reader->Read(partition.offset + *tmd_address, *tmd_size, tmd_buffer.data()))
return INVALID_TMD;
return IOS::ES::TMDReader{std::move(tmd_buffer)};
};
auto get_cert_chain = [this, partition]() -> std::vector<u8> {
const std::optional<u32> size =
m_reader->ReadSwapped<u32>(partition.offset + WII_PARTITION_CERT_CHAIN_SIZE_ADDRESS);
const std::optional<u64> address = ReadSwappedAndShifted(
partition.offset + WII_PARTITION_CERT_CHAIN_OFFSET_ADDRESS, PARTITION_NONE);
if (!size || !address)
return {};
std::vector<u8> cert_chain(*size);
if (!m_reader->Read(partition.offset + *address, *size, cert_chain.data()))
return {};
return cert_chain;
};
auto get_h3_table = [this, partition]() -> std::vector<u8> {
if (!m_has_hashes)
return {};
const std::optional<u64> h3_table_offset = ReadSwappedAndShifted(
partition.offset + WII_PARTITION_H3_OFFSET_ADDRESS, PARTITION_NONE);
if (!h3_table_offset)
return {};
std::vector<u8> h3_table(WII_PARTITION_H3_SIZE);
if (!m_reader->Read(partition.offset + *h3_table_offset, WII_PARTITION_H3_SIZE,
h3_table.data()))
return {};
return h3_table;
};
auto get_key = [this, partition]() -> std::unique_ptr<Common::AES::Context> {
const IOS::ES::TicketReader& ticket = *m_partitions[partition].ticket;
if (!ticket.IsValid())
return nullptr;
return Common::AES::CreateContextDecrypt(ticket.GetTitleKey().data());
};
auto get_file_system = [this, partition]() -> std::unique_ptr<FileSystem> {
auto file_system = std::make_unique<FileSystemGCWii>(this, partition);
return file_system->IsValid() ? std::move(file_system) : nullptr;
};
auto get_data_offset = [this, partition]() -> u64 {
return ReadSwappedAndShifted(partition.offset + 0x2b8, PARTITION_NONE).value_or(0);
};
m_partitions.emplace(
partition, PartitionDetails{Common::Lazy<std::unique_ptr<Common::AES::Context>>(get_key),
Common::Lazy<IOS::ES::TicketReader>(get_ticket),
Common::Lazy<IOS::ES::TMDReader>(get_tmd),
Common::Lazy<std::vector<u8>>(get_cert_chain),
Common::Lazy<std::vector<u8>>(get_h3_table),
Common::Lazy<std::unique_ptr<FileSystem>>(get_file_system),
Common::Lazy<u64>(get_data_offset), *partition_type});
}
}
}
VolumeWii::~VolumeWii()
{
}
bool VolumeWii::Read(u64 offset, u64 length, u8* buffer, const Partition& partition) const
{
if (partition == PARTITION_NONE)
return m_reader->Read(offset, length, buffer);
auto it = m_partitions.find(partition);
if (it == m_partitions.end())
return false;
const PartitionDetails& partition_details = it->second;
const u64 partition_data_offset = partition.offset + *partition_details.data_offset;
if (m_has_hashes && m_has_encryption &&
m_reader->SupportsReadWiiDecrypted(offset, length, partition_data_offset))
{
return m_reader->ReadWiiDecrypted(offset, length, buffer, partition_data_offset);
}
if (!m_has_hashes)
{
return m_reader->Read(partition_data_offset + offset, length, buffer);
}
Common::AES::Context* aes_context = nullptr;
std::unique_ptr<u8[]> read_buffer = nullptr;
if (m_has_encryption)
{
aes_context = partition_details.key->get();
if (!aes_context)
return false;
read_buffer = std::make_unique<u8[]>(BLOCK_TOTAL_SIZE);
}
while (length > 0)
{
// Calculate offsets
u64 block_offset_on_disc = partition_data_offset + offset / BLOCK_DATA_SIZE * BLOCK_TOTAL_SIZE;
u64 data_offset_in_block = offset % BLOCK_DATA_SIZE;
if (m_last_decrypted_block != block_offset_on_disc)
{
if (m_has_encryption)
{
// Read the current block
if (!m_reader->Read(block_offset_on_disc, BLOCK_TOTAL_SIZE, read_buffer.get()))
return false;
// Decrypt the block's data
DecryptBlockData(read_buffer.get(), m_last_decrypted_block_data, aes_context);
}
else
{
// Read the current block
if (!m_reader->Read(block_offset_on_disc + BLOCK_HEADER_SIZE, BLOCK_DATA_SIZE,
m_last_decrypted_block_data))
{
return false;
}
}
m_last_decrypted_block = block_offset_on_disc;
}
// Copy the decrypted data
u64 copy_size = std::min(length, BLOCK_DATA_SIZE - data_offset_in_block);
memcpy(buffer, &m_last_decrypted_block_data[data_offset_in_block],
static_cast<size_t>(copy_size));
// Update offsets
length -= copy_size;
buffer += copy_size;
offset += copy_size;
}
return true;
}
bool VolumeWii::HasWiiHashes() const
{
return m_has_hashes;
}
bool VolumeWii::HasWiiEncryption() const
{
return m_has_encryption;
}
std::vector<Partition> VolumeWii::GetPartitions() const
{
std::vector<Partition> partitions;
for (const auto& pair : m_partitions)
partitions.push_back(pair.first);
return partitions;
}
Partition VolumeWii::GetGamePartition() const
{
return m_game_partition;
}
std::optional<u32> VolumeWii::GetPartitionType(const Partition& partition) const
{
auto it = m_partitions.find(partition);
return it != m_partitions.end() ? it->second.type : std::optional<u32>();
}
std::optional<u64> VolumeWii::GetTitleID(const Partition& partition) const
{
const IOS::ES::TicketReader& ticket = GetTicket(partition);
if (!ticket.IsValid())
return {};
return ticket.GetTitleId();
}
const IOS::ES::TicketReader& VolumeWii::GetTicket(const Partition& partition) const
{
auto it = m_partitions.find(partition);
return it != m_partitions.end() ? *it->second.ticket : INVALID_TICKET;
}
const IOS::ES::TMDReader& VolumeWii::GetTMD(const Partition& partition) const
{
auto it = m_partitions.find(partition);
return it != m_partitions.end() ? *it->second.tmd : INVALID_TMD;
}
const std::vector<u8>& VolumeWii::GetCertificateChain(const Partition& partition) const
{
auto it = m_partitions.find(partition);
return it != m_partitions.end() ? *it->second.cert_chain : INVALID_CERT_CHAIN;
}
const FileSystem* VolumeWii::GetFileSystem(const Partition& partition) const
{
auto it = m_partitions.find(partition);
return it != m_partitions.end() ? it->second.file_system->get() : nullptr;
}
u64 VolumeWii::OffsetInHashedPartitionToRawOffset(u64 offset, const Partition& partition,
u64 partition_data_offset)
{
if (partition == PARTITION_NONE)
return offset;
return partition.offset + partition_data_offset + (offset / BLOCK_DATA_SIZE * BLOCK_TOTAL_SIZE) +
(offset % BLOCK_DATA_SIZE);
}
u64 VolumeWii::PartitionOffsetToRawOffset(u64 offset, const Partition& partition) const
{
auto it = m_partitions.find(partition);
if (it == m_partitions.end())
return offset;
const u64 data_offset = *it->second.data_offset;
if (!m_has_hashes)
return partition.offset + data_offset + offset;
return OffsetInHashedPartitionToRawOffset(offset, partition, data_offset);
}
std::string VolumeWii::GetGameTDBID(const Partition& partition) const
{
return GetGameID(partition);
}
Region VolumeWii::GetRegion() const
{
return RegionCodeToRegion(m_reader->ReadSwapped<u32>(0x4E000));
}
std::map<Language, std::string> VolumeWii::GetLongNames() const
{
std::vector<char16_t> names(NAMES_TOTAL_CHARS);
names.resize(ReadFile(*this, GetGamePartition(), "opening.bnr",
reinterpret_cast<u8*>(names.data()), NAMES_TOTAL_BYTES, 0x5C));
return ReadWiiNames(names);
}
std::vector<u32> VolumeWii::GetBanner(u32* width, u32* height) const
{
*width = 0;
*height = 0;
const std::optional<u64> title_id = GetTitleID(GetGamePartition());
if (!title_id)
return std::vector<u32>();
return WiiSaveBanner(*title_id).GetBanner(width, height);
}
Platform VolumeWii::GetVolumeType() const
{
return Platform::WiiDisc;
}
bool VolumeWii::IsDatelDisc() const
{
return m_game_partition == PARTITION_NONE;
}
BlobType VolumeWii::GetBlobType() const
{
return m_reader->GetBlobType();
}
u64 VolumeWii::GetDataSize() const
{
return m_reader->GetDataSize();
}
DataSizeType VolumeWii::GetDataSizeType() const
{
return m_reader->GetDataSizeType();
}
u64 VolumeWii::GetRawSize() const
{
return m_reader->GetRawSize();
}
const BlobReader& VolumeWii::GetBlobReader() const
{
return *m_reader;
}
std::array<u8, 20> VolumeWii::GetSyncHash() const
{
auto context = Common::SHA1::CreateContext();
// Disc header
ReadAndAddToSyncHash(context.get(), 0, 0x80, PARTITION_NONE);
// Region code
ReadAndAddToSyncHash(context.get(), 0x4E000, 4, PARTITION_NONE);
// The data offset of the game partition - an important factor for disc drive timings
const u64 data_offset = PartitionOffsetToRawOffset(0, GetGamePartition());
context->Update(reinterpret_cast<const u8*>(&data_offset), sizeof(data_offset));
// TMD
AddTMDToSyncHash(context.get(), GetGamePartition());
// Game partition contents
AddGamePartitionToSyncHash(context.get());
return context->Finish();
}
bool VolumeWii::CheckH3TableIntegrity(const Partition& partition) const
{
auto it = m_partitions.find(partition);
if (it == m_partitions.end())
return false;
const PartitionDetails& partition_details = it->second;
const std::vector<u8>& h3_table = *partition_details.h3_table;
if (h3_table.size() != WII_PARTITION_H3_SIZE)
return false;
const IOS::ES::TMDReader& tmd = *partition_details.tmd;
if (!tmd.IsValid())
return false;
const std::vector<IOS::ES::Content> contents = tmd.GetContents();
if (contents.size() != 1)
return false;
return Common::SHA1::CalculateDigest(h3_table) == contents[0].sha1;
}
bool VolumeWii::CheckBlockIntegrity(u64 block_index, const u8* encrypted_data,
const Partition& partition) const
{
auto it = m_partitions.find(partition);
if (it == m_partitions.end())
return false;
const PartitionDetails& partition_details = it->second;
if (block_index / BLOCKS_PER_GROUP * Common::SHA1::DIGEST_LEN >=
partition_details.h3_table->size())
{
return false;
}
HashBlock hashes;
u8 cluster_data_buffer[BLOCK_DATA_SIZE];
const u8* cluster_data;
if (m_has_encryption)
{
Common::AES::Context* aes_context = partition_details.key->get();
if (!aes_context)
return false;
DecryptBlockHashes(encrypted_data, &hashes, aes_context);
DecryptBlockData(encrypted_data, cluster_data_buffer, aes_context);
cluster_data = cluster_data_buffer;
}
else
{
std::memcpy(&hashes, encrypted_data, BLOCK_HEADER_SIZE);
cluster_data = encrypted_data + BLOCK_HEADER_SIZE;
}
for (u32 hash_index = 0; hash_index < 31; ++hash_index)
{
if (Common::SHA1::CalculateDigest(&cluster_data[hash_index * 0x400], 0x400) !=
hashes.h0[hash_index])
{
return false;
}
}
if (Common::SHA1::CalculateDigest(hashes.h0) != hashes.h1[block_index % 8])
return false;
if (Common::SHA1::CalculateDigest(hashes.h1) != hashes.h2[block_index / 8 % 8])
return false;
Common::SHA1::Digest h3_digest;
auto h3_digest_ptr =
partition_details.h3_table->data() + block_index / 64 * Common::SHA1::DIGEST_LEN;
memcpy(h3_digest.data(), h3_digest_ptr, sizeof(h3_digest));
if (Common::SHA1::CalculateDigest(hashes.h2) != h3_digest)
return false;
return true;
}
bool VolumeWii::CheckBlockIntegrity(u64 block_index, const Partition& partition) const
{
auto it = m_partitions.find(partition);
if (it == m_partitions.end())
return false;
const PartitionDetails& partition_details = it->second;
const u64 cluster_offset =
partition.offset + *partition_details.data_offset + block_index * BLOCK_TOTAL_SIZE;
std::vector<u8> cluster(BLOCK_TOTAL_SIZE);
if (!m_reader->Read(cluster_offset, cluster.size(), cluster.data()))
return false;
return CheckBlockIntegrity(block_index, cluster.data(), partition);
}
bool VolumeWii::HashGroup(const std::array<u8, BLOCK_DATA_SIZE> in[BLOCKS_PER_GROUP],
HashBlock out[BLOCKS_PER_GROUP],
const std::function<bool(size_t block)>& read_function)
{
std::array<std::future<void>, BLOCKS_PER_GROUP> hash_futures;
bool success = true;
for (size_t i = 0; i < BLOCKS_PER_GROUP; ++i)
{
if (read_function && success)
success = read_function(i);
hash_futures[i] = std::async(std::launch::async, [&in, &out, &hash_futures, success, i]() {
const size_t h1_base = Common::AlignDown(i, 8);
if (success)
{
// H0 hashes
for (size_t j = 0; j < 31; ++j)
out[i].h0[j] = Common::SHA1::CalculateDigest(in[i].data() + j * 0x400, 0x400);
// H0 padding
out[i].padding_0 = {};
// H1 hash
out[h1_base].h1[i - h1_base] = Common::SHA1::CalculateDigest(out[i].h0);
}
if (i % 8 == 7)
{
for (size_t j = 0; j < 7; ++j)
hash_futures[h1_base + j].get();
if (success)
{
// H1 padding
out[h1_base].padding_1 = {};
// H1 copies
for (size_t j = 1; j < 8; ++j)
out[h1_base + j].h1 = out[h1_base].h1;
// H2 hash
out[0].h2[h1_base / 8] = Common::SHA1::CalculateDigest(out[i].h1);
}
if (i == BLOCKS_PER_GROUP - 1)
{
for (size_t j = 0; j < 7; ++j)
hash_futures[j * 8 + 7].get();
if (success)
{
// H2 padding
out[0].padding_2 = {};
// H2 copies
for (size_t j = 1; j < BLOCKS_PER_GROUP; ++j)
out[j].h2 = out[0].h2;
}
}
}
});
}
// Wait for all the async tasks to finish
hash_futures.back().get();
return success;
}
bool VolumeWii::EncryptGroup(
u64 offset, u64 partition_data_offset, u64 partition_data_decrypted_size,
const std::array<u8, AES_KEY_SIZE>& key, BlobReader* blob,
std::array<u8, GROUP_TOTAL_SIZE>* out,
const std::function<void(HashBlock hash_blocks[BLOCKS_PER_GROUP])>& hash_exception_callback)
{
std::vector<std::array<u8, BLOCK_DATA_SIZE>> unencrypted_data(BLOCKS_PER_GROUP);
std::vector<HashBlock> unencrypted_hashes(BLOCKS_PER_GROUP);
const bool success =
HashGroup(unencrypted_data.data(), unencrypted_hashes.data(), [&](size_t block) {
if (offset + (block + 1) * BLOCK_DATA_SIZE <= partition_data_decrypted_size)
{
if (!blob->ReadWiiDecrypted(offset + block * BLOCK_DATA_SIZE, BLOCK_DATA_SIZE,
unencrypted_data[block].data(), partition_data_offset))
{
return false;
}
}
else
{
unencrypted_data[block].fill(0);
}
return true;
});
if (!success)
return false;
if (hash_exception_callback)
hash_exception_callback(unencrypted_hashes.data());
const unsigned int threads =
std::min(BLOCKS_PER_GROUP, std::max<unsigned int>(1, std::thread::hardware_concurrency()));
std::vector<std::future<void>> encryption_futures(threads);
auto aes_context = Common::AES::CreateContextEncrypt(key.data());
for (size_t i = 0; i < threads; ++i)
{
encryption_futures[i] = std::async(
std::launch::async,
[&unencrypted_data, &unencrypted_hashes, &aes_context, &out](size_t start, size_t end) {
for (size_t j = start; j < end; ++j)
{
u8* out_ptr = out->data() + j * BLOCK_TOTAL_SIZE;
aes_context->CryptIvZero(reinterpret_cast<u8*>(&unencrypted_hashes[j]), out_ptr,
BLOCK_HEADER_SIZE);
aes_context->Crypt(out_ptr + 0x3D0, unencrypted_data[j].data(),
out_ptr + BLOCK_HEADER_SIZE, BLOCK_DATA_SIZE);
}
},
i * BLOCKS_PER_GROUP / threads, (i + 1) * BLOCKS_PER_GROUP / threads);
}
for (std::future<void>& future : encryption_futures)
future.get();
return true;
}
void VolumeWii::DecryptBlockHashes(const u8* in, HashBlock* out, Common::AES::Context* aes_context)
{
aes_context->CryptIvZero(in, reinterpret_cast<u8*>(out), sizeof(HashBlock));
}
void VolumeWii::DecryptBlockData(const u8* in, u8* out, Common::AES::Context* aes_context)
{
aes_context->Crypt(&in[0x3d0], &in[sizeof(HashBlock)], out, BLOCK_DATA_SIZE);
}
} // namespace DiscIO
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