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Merge pull request #4020 from wwylele/loader-crypto-new

Browse source 
ncch_container: support encrypted games
This commit is contained in:
Weiyi Wang 2018-08-08 22:12:19 +03:00 committed by GitHub
parent 8ae126eb33 d4a808c885
commit 84fc8eaaba
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
17 changed files with 319 additions and 103 deletions
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2
src/core/CMakeLists.txt
View file

@ -64,6 +64,8 @@ add_library(core STATIC
file_sys/ncch_container.h
file_sys/path_parser.cpp
file_sys/path_parser.h
file_sys/romfs_reader.cpp
file_sys/romfs_reader.h
file_sys/savedata_archive.cpp
file_sys/savedata_archive.h
file_sys/title_metadata.cpp

9
src/core/file_sys/archive_ncch.cpp
View file

@ -74,14 +74,11 @@ ResultVal<std::unique_ptr<FileBackend>> NCCHArchive::OpenFile(const Path& path,
// NCCH RomFS
NCCHFilePathType filepath_type = static_cast<NCCHFilePathType>(openfile_path.filepath_type);
if (filepath_type == NCCHFilePathType::RomFS) {
std::shared_ptr<FileUtil::IOFile> romfs_file;
u64 romfs_offset = 0;
u64 romfs_size = 0;
std::shared_ptr<RomFSReader> romfs_file;
result = ncch_container.ReadRomFS(romfs_file, romfs_offset, romfs_size);
result = ncch_container.ReadRomFS(romfs_file);
std::unique_ptr<DelayGenerator> delay_generator = std::make_unique<RomFSDelayGenerator>();
file = std::make_unique<IVFCFile>(std::move(romfs_file), romfs_offset, romfs_size,
std::move(delay_generator));
file = std::make_unique<IVFCFile>(std::move(romfs_file), std::move(delay_generator));
} else if (filepath_type == NCCHFilePathType::Code ||
filepath_type == NCCHFilePathType::ExeFS) {
std::vector<u8> buffer;

17
src/core/file_sys/archive_selfncch.cpp
View file

@ -174,8 +174,7 @@ private:
std::unique_ptr<DelayGenerator> delay_generator =
std::make_unique<RomFSDelayGenerator>();
return MakeResult<std::unique_ptr<FileBackend>>(
std::make_unique<IVFCFile>(ncch_data.romfs_file, ncch_data.romfs_offset,
ncch_data.romfs_size, std::move(delay_generator)));
std::make_unique<IVFCFile>(ncch_data.romfs_file, std::move(delay_generator)));
} else {
LOG_INFO(Service_FS, "Unable to read RomFS");
return ERROR_ROMFS_NOT_FOUND;
@ -187,8 +186,7 @@ private:
std::unique_ptr<DelayGenerator> delay_generator =
std::make_unique<RomFSDelayGenerator>();
return MakeResult<std::unique_ptr<FileBackend>>(std::make_unique<IVFCFile>(
ncch_data.update_romfs_file, ncch_data.update_romfs_offset,
ncch_data.update_romfs_size, std::move(delay_generator)));
ncch_data.update_romfs_file, std::move(delay_generator)));
} else {
LOG_INFO(Service_FS, "Unable to read update RomFS");
return ERROR_ROMFS_NOT_FOUND;
@ -252,17 +250,14 @@ void ArchiveFactory_SelfNCCH::Register(Loader::AppLoader& app_loader) {
NCCHData& data = ncch_data[program_id];
std::shared_ptr<FileUtil::IOFile> romfs_file_;
if (Loader::ResultStatus::Success ==
app_loader.ReadRomFS(romfs_file_, data.romfs_offset, data.romfs_size)) {
std::shared_ptr<RomFSReader> romfs_file_;
if (Loader::ResultStatus::Success == app_loader.ReadRomFS(romfs_file_)) {
data.romfs_file = std::move(romfs_file_);
}
std::shared_ptr<FileUtil::IOFile> update_romfs_file;
if (Loader::ResultStatus::Success == app_loader.ReadUpdateRomFS(update_romfs_file,
data.update_romfs_offset,
data.update_romfs_size)) {
std::shared_ptr<RomFSReader> update_romfs_file;
if (Loader::ResultStatus::Success == app_loader.ReadUpdateRomFS(update_romfs_file)) {
data.update_romfs_file = std::move(update_romfs_file);
}

9
src/core/file_sys/archive_selfncch.h
View file

@ -22,13 +22,8 @@ struct NCCHData {
std::shared_ptr<std::vector<u8>> icon;
std::shared_ptr<std::vector<u8>> logo;
std::shared_ptr<std::vector<u8>> banner;
std::shared_ptr<FileUtil::IOFile> romfs_file;
u64 romfs_offset = 0;
u64 romfs_size = 0;
std::shared_ptr<FileUtil::IOFile> update_romfs_file;
u64 update_romfs_offset = 0;
u64 update_romfs_size = 0;
std::shared_ptr<RomFSReader> romfs_file;
std::shared_ptr<RomFSReader> update_romfs_file;
};
/// File system interface to the SelfNCCH archive

16
src/core/file_sys/ivfc_archive.cpp
View file

@ -14,8 +14,7 @@
namespace FileSys {
IVFCArchive::IVFCArchive(std::shared_ptr<FileUtil::IOFile> file, u64 offset, u64 size)
: romfs_file(std::move(file)), data_offset(offset), data_size(size) {}
IVFCArchive::IVFCArchive(std::shared_ptr<RomFSReader> file) : romfs_file(std::move(file)) {}
std::string IVFCArchive::GetName() const {
return "IVFC";
@ -25,7 +24,7 @@ ResultVal<std::unique_ptr<FileBackend>> IVFCArchive::OpenFile(const Path& path,
const Mode& mode) const {
std::unique_ptr<DelayGenerator> delay_generator = std::make_unique<IVFCDelayGenerator>();
return MakeResult<std::unique_ptr<FileBackend>>(
std::make_unique<IVFCFile>(romfs_file, data_offset, data_size, std::move(delay_generator)));
std::make_unique<IVFCFile>(romfs_file, std::move(delay_generator)));
}
ResultCode IVFCArchive::DeleteFile(const Path& path) const {
@ -85,18 +84,15 @@ u64 IVFCArchive::GetFreeBytes() const {
////////////////////////////////////////////////////////////////////////////////////////////////////
IVFCFile::IVFCFile(std::shared_ptr<FileUtil::IOFile> file, u64 offset, u64 size,
IVFCFile::IVFCFile(std::shared_ptr<RomFSReader> file,
std::unique_ptr<DelayGenerator> delay_generator_)
: romfs_file(std::move(file)), data_offset(offset), data_size(size) {
: romfs_file(std::move(file)) {
delay_generator = std::move(delay_generator_);
}
ResultVal<size_t> IVFCFile::Read(const u64 offset, const size_t length, u8* buffer) const {
LOG_TRACE(Service_FS, "called offset={}, length={}", offset, length);
romfs_file->Seek(data_offset + offset, SEEK_SET);
size_t read_length = (size_t)std::min((u64)length, data_size - offset);
return MakeResult<size_t>(romfs_file->ReadBytes(buffer, read_length));
return MakeResult<size_t>(romfs_file->ReadFile(offset, length, buffer));
}
ResultVal<size_t> IVFCFile::Write(const u64 offset, const size_t length, const bool flush,
@ -107,7 +103,7 @@ ResultVal<size_t> IVFCFile::Write(const u64 offset, const size_t length, const b
}
u64 IVFCFile::GetSize() const {
return data_size;
return romfs_file->GetSize();
}
bool IVFCFile::SetSize(const u64 size) const {

14
src/core/file_sys/ivfc_archive.h
View file

@ -13,6 +13,7 @@
#include "core/file_sys/archive_backend.h"
#include "core/file_sys/directory_backend.h"
#include "core/file_sys/file_backend.h"
#include "core/file_sys/romfs_reader.h"
#include "core/hle/result.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
@ -67,7 +68,7 @@ public:
*/
class IVFCArchive : public ArchiveBackend {
public:
IVFCArchive(std::shared_ptr<FileUtil::IOFile> file, u64 offset, u64 size);
IVFCArchive(std::shared_ptr<RomFSReader> file);
std::string GetName() const override;
@ -84,15 +85,12 @@ public:
u64 GetFreeBytes() const override;
protected:
std::shared_ptr<FileUtil::IOFile> romfs_file;
u64 data_offset;
u64 data_size;
std::shared_ptr<RomFSReader> romfs_file;
};
class IVFCFile : public FileBackend {
public:
IVFCFile(std::shared_ptr<FileUtil::IOFile> file, u64 offset, u64 size,
std::unique_ptr<DelayGenerator> delay_generator_);
IVFCFile(std::shared_ptr<RomFSReader> file, std::unique_ptr<DelayGenerator> delay_generator_);
ResultVal<size_t> Read(u64 offset, size_t length, u8* buffer) const override;
ResultVal<size_t> Write(u64 offset, size_t length, bool flush, const u8* buffer) override;
@ -104,9 +102,7 @@ public:
void Flush() const override {}
private:
std::shared_ptr<FileUtil::IOFile> romfs_file;
u64 data_offset;
u64 data_size;
std::shared_ptr<RomFSReader> romfs_file;
};
class IVFCDirectory : public DirectoryBackend {

193
src/core/file_sys/ncch_container.cpp
View file

@ -5,10 +5,13 @@
#include <cinttypes>
#include <cstring>
#include <memory>
#include <cryptopp/aes.h>
#include <cryptopp/modes.h>
#include "common/common_types.h"
#include "common/logging/log.h"
#include "core/core.h"
#include "core/file_sys/ncch_container.h"
#include "core/hw/aes/key.h"
#include "core/loader/loader.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
@ -142,6 +145,116 @@ Loader::ResultStatus NCCHContainer::Load() {
return Loader::ResultStatus::ErrorInvalidFormat;
has_header = true;
bool failed_to_decrypt = false;
if (!ncch_header.no_crypto) {
is_encrypted = true;
// Find primary and secondary keys
if (ncch_header.fixed_key) {
LOG_DEBUG(Service_FS, "Fixed-key crypto");
primary_key.fill(0);
secondary_key.fill(0);
} else {
using namespace HW::AES;
InitKeys();
std::array<u8, 16> key_y_primary, key_y_secondary;
std::copy(ncch_header.signature, ncch_header.signature + key_y_primary.size(),
key_y_primary.begin());
if (!ncch_header.seed_crypto) {
key_y_secondary = key_y_primary;
} else {
// Seed crypto is unimplemented.
LOG_ERROR(Service_FS, "Unsupported seed crypto");
failed_to_decrypt = true;
}
SetKeyY(KeySlotID::NCCHSecure1, key_y_primary);
if (!IsNormalKeyAvailable(KeySlotID::NCCHSecure1)) {
LOG_ERROR(Service_FS, "Secure1 KeyX missing");
failed_to_decrypt = true;
}
primary_key = GetNormalKey(KeySlotID::NCCHSecure1);
switch (ncch_header.secondary_key_slot) {
case 0:
LOG_DEBUG(Service_FS, "Secure1 crypto");
secondary_key = primary_key;
break;
case 1:
LOG_DEBUG(Service_FS, "Secure2 crypto");
SetKeyY(KeySlotID::NCCHSecure2, key_y_secondary);
if (!IsNormalKeyAvailable(KeySlotID::NCCHSecure2)) {
LOG_ERROR(Service_FS, "Secure2 KeyX missing");
failed_to_decrypt = true;
}
secondary_key = GetNormalKey(KeySlotID::NCCHSecure2);
break;
case 10:
LOG_DEBUG(Service_FS, "Secure3 crypto");
SetKeyY(KeySlotID::NCCHSecure3, key_y_secondary);
if (!IsNormalKeyAvailable(KeySlotID::NCCHSecure3)) {
LOG_ERROR(Service_FS, "Secure3 KeyX missing");
failed_to_decrypt = true;
}
secondary_key = GetNormalKey(KeySlotID::NCCHSecure3);
break;
case 11:
LOG_DEBUG(Service_FS, "Secure4 crypto");
SetKeyY(KeySlotID::NCCHSecure4, key_y_secondary);
if (!IsNormalKeyAvailable(KeySlotID::NCCHSecure4)) {
LOG_ERROR(Service_FS, "Secure4 KeyX missing");
failed_to_decrypt = true;
}
secondary_key = GetNormalKey(KeySlotID::NCCHSecure4);
break;
}
}
// Find CTR for each section
// Written with reference to
// https://github.com/d0k3/GodMode9/blob/99af6a73be48fa7872649aaa7456136da0df7938/arm9/source/game/ncch.c#L34-L52
if (ncch_header.version == 0 || ncch_header.version == 2) {
LOG_DEBUG(Loader, "NCCH version 0/2");
// In this version, CTR for each section is a magic number prefixed by partition ID
// (reverse order)
std::reverse_copy(ncch_header.partition_id, ncch_header.partition_id + 8,
exheader_ctr.begin());
exefs_ctr = romfs_ctr = exheader_ctr;
exheader_ctr[8] = 1;
exefs_ctr[8] = 2;
romfs_ctr[8] = 3;
} else if (ncch_header.version == 1) {
LOG_DEBUG(Loader, "NCCH version 1");
// In this version, CTR for each section is the section offset prefixed by partition
// ID, as if the entire NCCH image is encrypted using a single CTR stream.
std::copy(ncch_header.partition_id, ncch_header.partition_id + 8,
exheader_ctr.begin());
exefs_ctr = romfs_ctr = exheader_ctr;
auto u32ToBEArray = [](u32 value) -> std::array<u8, 4> {
return std::array<u8, 4>{
static_cast<u8>(value >> 24),
static_cast<u8>((value >> 16) & 0xFF),
static_cast<u8>((value >> 8) & 0xFF),
static_cast<u8>(value & 0xFF),
};
};
auto offset_exheader = u32ToBEArray(0x200); // exheader offset
auto offset_exefs = u32ToBEArray(ncch_header.exefs_offset * kBlockSize);
auto offset_romfs = u32ToBEArray(ncch_header.romfs_offset * kBlockSize);
std::copy(offset_exheader.begin(), offset_exheader.end(),
exheader_ctr.begin() + 12);
std::copy(offset_exefs.begin(), offset_exefs.end(), exefs_ctr.begin() + 12);
std::copy(offset_romfs.begin(), offset_romfs.end(), romfs_ctr.begin() + 12);
} else {
LOG_ERROR(Service_FS, "Unknown NCCH version {}", ncch_header.version);
failed_to_decrypt = true;
}
} else {
LOG_DEBUG(Service_FS, "No crypto");
is_encrypted = false;
}
// System archives and DLC don't have an extended header but have RomFS
if (ncch_header.extended_header_size) {
@ -149,6 +262,26 @@ Loader::ResultStatus NCCHContainer::Load() {
sizeof(ExHeader_Header))
return Loader::ResultStatus::Error;
if (is_encrypted) {
// This ID check is masked to low 32-bit as a toleration to ill-formed ROM created
// by merging games and its updates.
if ((exheader_header.system_info.jump_id & 0xFFFFFFFF) ==
(ncch_header.program_id & 0xFFFFFFFF)) {
LOG_WARNING(Service_FS, "NCCH is marked as encrypted but with decrypted "
"exheader. Force no crypto scheme.");
is_encrypted = false;
} else {
if (failed_to_decrypt) {
LOG_ERROR(Service_FS, "Failed to decrypt");
return Loader::ResultStatus::ErrorEncrypted;
}
CryptoPP::byte* data = reinterpret_cast<CryptoPP::byte*>(&exheader_header);
CryptoPP::CTR_Mode<CryptoPP::AES>::Decryption(
primary_key.data(), primary_key.size(), exheader_ctr.data())
.ProcessData(data, data, sizeof(exheader_header));
}
}
is_compressed = (exheader_header.codeset_info.flags.flag & 1) == 1;
u32 entry_point = exheader_header.codeset_info.text.address;
u32 code_size = exheader_header.codeset_info.text.code_size;
@ -173,12 +306,6 @@ Loader::ResultStatus NCCHContainer::Load() {
LOG_DEBUG(Service_FS, "System Mode: {}",
static_cast<int>(exheader_header.arm11_system_local_caps.system_mode));
if (exheader_header.system_info.jump_id != ncch_header.program_id) {
LOG_ERROR(Service_FS,
"ExHeader Program ID mismatch: the ROM is probably encrypted.");
return Loader::ResultStatus::ErrorEncrypted;
}
has_exheader = true;
}
@ -194,6 +321,13 @@ Loader::ResultStatus NCCHContainer::Load() {
if (file.ReadBytes(&exefs_header, sizeof(ExeFs_Header)) != sizeof(ExeFs_Header))
return Loader::ResultStatus::Error;
if (is_encrypted) {
CryptoPP::byte* data = reinterpret_cast<CryptoPP::byte*>(&exefs_header);
CryptoPP::CTR_Mode<CryptoPP::AES>::Decryption(primary_key.data(),
primary_key.size(), exefs_ctr.data())
.ProcessData(data, data, sizeof(exefs_header));
}
exefs_file = FileUtil::IOFile(filepath, "rb");
has_exefs = true;
}
@ -293,6 +427,17 @@ Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vect
(section.offset + exefs_offset + sizeof(ExeFs_Header) + ncch_offset);
exefs_file.Seek(section_offset, SEEK_SET);
std::array<u8, 16> key;
if (strcmp(section.name, "icon") == 0 || strcmp(section.name, "banner") == 0) {
key = primary_key;
} else {
key = secondary_key;
}
CryptoPP::CTR_Mode<CryptoPP::AES>::Decryption dec(key.data(), key.size(),
exefs_ctr.data());
dec.Seek(section.offset + sizeof(ExeFs_Header));
if (strcmp(section.name, ".code") == 0 && is_compressed) {
// Section is compressed, read compressed .code section...
std::unique_ptr<u8[]> temp_buffer;
@ -305,6 +450,10 @@ Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vect
if (exefs_file.ReadBytes(&temp_buffer[0], section.size) != section.size)
return Loader::ResultStatus::Error;
if (is_encrypted) {
dec.ProcessData(&temp_buffer[0], &temp_buffer[0], section.size);
}
// Decompress .code section...
u32 decompressed_size = LZSS_GetDecompressedSize(&temp_buffer[0], section.size);
buffer.resize(decompressed_size);
@ -315,6 +464,9 @@ Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vect
buffer.resize(section.size);
if (exefs_file.ReadBytes(&buffer[0], section.size) != section.size)
return Loader::ResultStatus::Error;
if (is_encrypted) {
dec.ProcessData(&buffer[0], &buffer[0], section.size);
}
}
return Loader::ResultStatus::Success;
}
@ -354,13 +506,12 @@ Loader::ResultStatus NCCHContainer::LoadOverrideExeFSSection(const char* name,
return Loader::ResultStatus::ErrorNotUsed;
}
Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file,
u64& offset, u64& size) {
Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<RomFSReader>& romfs_file) {
Loader::ResultStatus result = Load();
if (result != Loader::ResultStatus::Success)
return result;
if (ReadOverrideRomFS(romfs_file, offset, size) == Loader::ResultStatus::Success)
if (ReadOverrideRomFS(romfs_file) == Loader::ResultStatus::Success)
return Loader::ResultStatus::Success;
if (!has_romfs) {
@ -381,26 +532,30 @@ Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<FileUtil::IOFile>&
return Loader::ResultStatus::Error;
// We reopen the file, to allow its position to be independent from file's
romfs_file = std::make_shared<FileUtil::IOFile>(filepath, "rb");
if (!romfs_file->IsOpen())
FileUtil::IOFile romfs_file_inner(filepath, "rb");
if (!romfs_file_inner.IsOpen())
return Loader::ResultStatus::Error;
offset = romfs_offset;
size = romfs_size;
if (is_encrypted) {
romfs_file = std::make_shared<RomFSReader>(std::move(romfs_file_inner), romfs_offset,
romfs_size, secondary_key, romfs_ctr, 0x1000);
} else {
romfs_file =
std::make_shared<RomFSReader>(std::move(romfs_file_inner), romfs_offset, romfs_size);
}
return Loader::ResultStatus::Success;
}
Loader::ResultStatus NCCHContainer::ReadOverrideRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file,
u64& offset, u64& size) {
Loader::ResultStatus NCCHContainer::ReadOverrideRomFS(std::shared_ptr<RomFSReader>& romfs_file) {
// Check for RomFS overrides
std::string split_filepath = filepath + ".romfs";
if (FileUtil::Exists(split_filepath)) {
romfs_file = std::make_shared<FileUtil::IOFile>(split_filepath, "rb");
if (romfs_file->IsOpen()) {
FileUtil::IOFile romfs_file_inner(split_filepath, "rb");
if (romfs_file_inner.IsOpen()) {
LOG_WARNING(Service_FS, "File {} overriding built-in RomFS", split_filepath);
offset = 0;
size = romfs_file->GetSize();
romfs_file = std::make_shared<RomFSReader>(std::move(romfs_file_inner), 0,
romfs_file_inner.GetSize());
return Loader::ResultStatus::Success;
}
}

38
src/core/file_sys/ncch_container.h
View file

@ -13,6 +13,7 @@
#include "common/file_util.h"
#include "common/swap.h"
#include "core/core.h"
#include "core/file_sys/romfs_reader.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
/// NCCH header (Note: "NCCH" appears to be a publicly unknown acronym)
@ -32,7 +33,28 @@ struct NCCH_Header {
u8 extended_header_hash[0x20];
u32_le extended_header_size;
u8 reserved_2[4];
u8 flags[8];
u8 reserved_flag[3];
u8 secondary_key_slot;
u8 platform;
enum class ContentType : u8 {
Application = 0,
SystemUpdate = 1,
Manual = 2,
Child = 3,
Trial = 4,
};
union {
BitField<0, 1, u8> is_data;
BitField<1, 1, u8> is_executable;
BitField<2, 3, ContentType> content_type;
};
u8 content_unit_size;
union {
BitField<0, 1, u8> fixed_key;
BitField<1, 1, u8> no_romfs;
BitField<2, 1, u8> no_crypto;
BitField<5, 1, u8> seed_crypto;
};
u32_le plain_region_offset;
u32_le plain_region_size;
u32_le logo_region_offset;
@ -211,8 +233,7 @@ public:
* @param size The size of the romfs
* @return ResultStatus result of function
*/
Loader::ResultStatus ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset,
u64& size);
Loader::ResultStatus ReadRomFS(std::shared_ptr<RomFSReader>& romfs_file);
/**
* Get the override RomFS of the NCCH container
@ -222,8 +243,7 @@ public:
* @param size The size of the romfs
* @return ResultStatus result of function
*/
Loader::ResultStatus ReadOverrideRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file,
u64& offset, u64& size);
Loader::ResultStatus ReadOverrideRomFS(std::shared_ptr<RomFSReader>& romfs_file);
/**
* Get the Program ID of the NCCH container
@ -263,6 +283,14 @@ private:
bool is_loaded = false;
bool is_compressed = false;
bool is_encrypted = false;
// for decrypting exheader, exefs header and icon/banner section
std::array<u8, 16> primary_key{};
std::array<u8, 16> secondary_key{}; // for decrypting romfs and .code section
std::array<u8, 16> exheader_ctr{};
std::array<u8, 16> exefs_ctr{};
std::array<u8, 16> romfs_ctr{};
u32 ncch_offset = 0; // Offset to NCCH header, can be 0 for NCCHs or non-zero for CIAs/NCSDs
u32 exefs_offset = 0;

22
src/core/file_sys/romfs_reader.cpp Normal file
View file

@ -0,0 +1,22 @@
#include <algorithm>
#include <cryptopp/aes.h>
#include <cryptopp/modes.h>
#include "core/file_sys/romfs_reader.h"
namespace FileSys {
std::size_t RomFSReader::ReadFile(std::size_t offset, std::size_t length, u8* buffer) {
if (length == 0)
return 0; // Crypto++ does not like zero size buffer
file.Seek(file_offset + offset, SEEK_SET);
std::size_t read_length = std::min(length, data_size - offset);
read_length = file.ReadBytes(buffer, read_length);
if (is_encrypted) {
CryptoPP::CTR_Mode<CryptoPP::AES>::Decryption d(key.data(), key.size(), ctr.data());
d.Seek(crypto_offset + offset);
d.ProcessData(buffer, buffer, read_length);
}
return read_length;
}
} // namespace FileSys

37
src/core/file_sys/romfs_reader.h Normal file
View file

@ -0,0 +1,37 @@
#pragma once
#include <array>
#include "common/common_types.h"
#include "common/file_util.h"
namespace FileSys {
class RomFSReader {
public:
RomFSReader(FileUtil::IOFile&& file, std::size_t file_offset, std::size_t data_size)
: is_encrypted(false), file(std::move(file)), file_offset(file_offset),
data_size(data_size) {}
RomFSReader(FileUtil::IOFile&& file, std::size_t file_offset, std::size_t data_size,
const std::array<u8, 16>& key, const std::array<u8, 16>& ctr,
std::size_t crypto_offset)
: is_encrypted(true), file(std::move(file)), key(key), ctr(ctr), file_offset(file_offset),
crypto_offset(crypto_offset), data_size(data_size) {}
std::size_t GetSize() const {
return data_size;
}
std::size_t ReadFile(std::size_t offset, std::size_t length, u8* buffer);
private:
bool is_encrypted;
FileUtil::IOFile file;
std::array<u8, 16> key;
std::array<u8, 16> ctr;
std::size_t file_offset;
std::size_t crypto_offset;
std::size_t data_size;
};
} // namespace FileSys

12
src/core/hw/aes/key.cpp
View file

@ -56,13 +56,6 @@ struct KeySlot {
std::array<KeySlot, KeySlotID::MaxKeySlotID> key_slots;
void ClearAllKeys() {
for (KeySlot& slot : key_slots) {
slot.Clear();
}
generator_constant.reset();
}
AESKey HexToKey(const std::string& hex) {
if (hex.size() < 32) {
throw std::invalid_argument("hex string is too short");
@ -141,8 +134,11 @@ void LoadPresetKeys() {
} // namespace
void InitKeys() {
ClearAllKeys();
static bool initialized = false;
if (initialized)
return;
LoadPresetKeys();
initialized = true;
}
void SetGeneratorConstant(const AESKey& key) {

10
src/core/hw/aes/key.h
View file

@ -12,8 +12,16 @@ namespace HW {
namespace AES {
enum KeySlotID : size_t {
// AES Keyslot used to generate the UDS data frame CCMP key.
// AES keyslots used to decrypt NCCH
NCCHSecure1 = 0x2C,
NCCHSecure2 = 0x25,
NCCHSecure3 = 0x18,
NCCHSecure4 = 0x1B,
// AES keyslot used to generate the UDS data frame CCMP key.
UDSDataKey = 0x2D,
// AES keyslot used for APT:Wrap/Unwrap functions
APTWrap = 0x31,
MaxKeySlotID = 0x40,

11
src/core/loader/3dsx.cpp
View file

@ -283,8 +283,7 @@ ResultStatus AppLoader_THREEDSX::Load(Kernel::SharedPtr<Kernel::Process>& proces
return ResultStatus::Success;
}
ResultStatus AppLoader_THREEDSX::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file,
u64& offset, u64& size) {
ResultStatus AppLoader_THREEDSX::ReadRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) {
if (!file.IsOpen())
return ResultStatus::Error;
@ -307,12 +306,12 @@ ResultStatus AppLoader_THREEDSX::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& ro
LOG_DEBUG(Loader, "RomFS size: {:#010X}", romfs_size);
// We reopen the file, to allow its position to be independent from file's
romfs_file = std::make_shared<FileUtil::IOFile>(filepath, "rb");
if (!romfs_file->IsOpen())
FileUtil::IOFile romfs_file_inner(filepath, "rb");
if (!romfs_file_inner.IsOpen())
return ResultStatus::Error;
offset = romfs_offset;
size = romfs_size;
romfs_file = std::make_shared<FileSys::RomFSReader>(std::move(romfs_file_inner),
romfs_offset, romfs_size);
return ResultStatus::Success;
}

3
src/core/loader/3dsx.h
View file

@ -35,8 +35,7 @@ public:
ResultStatus ReadIcon(std::vector<u8>& buffer) override;
ResultStatus ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset,
u64& size) override;
ResultStatus ReadRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) override;
private:
std::string filename;

11
src/core/loader/loader.h
View file

@ -13,6 +13,7 @@
#include <boost/optional.hpp>
#include "common/common_types.h"
#include "common/file_util.h"
#include "core/file_sys/romfs_reader.h"
#include "core/hle/kernel/kernel.h"
namespace Kernel {
@ -160,12 +161,9 @@ public:
* Get the RomFS of the application
* Since the RomFS can be huge, we return a file reference instead of copying to a buffer
* @param romfs_file The file containing the RomFS
* @param offset The offset the romfs begins on
* @param size The size of the romfs
* @return ResultStatus result of function
*/
virtual ResultStatus ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset,
u64& size) {
virtual ResultStatus ReadRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) {
return ResultStatus::ErrorNotImplemented;
}
@ -173,12 +171,9 @@ public:
* Get the update RomFS of the application
* Since the RomFS can be huge, we return a file reference instead of copying to a buffer
* @param romfs_file The file containing the RomFS
* @param offset The offset the romfs begins on
* @param size The size of the romfs
* @return ResultStatus result of function
*/
virtual ResultStatus ReadUpdateRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset,
u64& size) {
virtual ResultStatus ReadUpdateRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) {
return ResultStatus::ErrorNotImplemented;
}

12
src/core/loader/ncch.cpp
View file

@ -211,17 +211,15 @@ ResultStatus AppLoader_NCCH::ReadProgramId(u64& out_program_id) {
return ResultStatus::Success;
}
ResultStatus AppLoader_NCCH::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset,
u64& size) {
return base_ncch.ReadRomFS(romfs_file, offset, size);
ResultStatus AppLoader_NCCH::ReadRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) {
return base_ncch.ReadRomFS(romfs_file);
}
ResultStatus AppLoader_NCCH::ReadUpdateRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file,
u64& offset, u64& size) {
ResultStatus result = update_ncch.ReadRomFS(romfs_file, offset, size);
ResultStatus AppLoader_NCCH::ReadUpdateRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) {
ResultStatus result = update_ncch.ReadRomFS(romfs_file);
if (result != ResultStatus::Success)
return base_ncch.ReadRomFS(romfs_file, offset, size);
return base_ncch.ReadRomFS(romfs_file);
return ResultStatus::Success;
}

6
src/core/loader/ncch.h
View file

@ -51,11 +51,9 @@ public:
ResultStatus ReadProgramId(u64& out_program_id) override;
ResultStatus ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset,
u64& size) override;
ResultStatus ReadRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) override;
ResultStatus ReadUpdateRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset,
u64& size) override;
ResultStatus ReadUpdateRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) override;
ResultStatus ReadTitle(std::string& title) override;