Load keys from the o3DS save mode native firm
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@ -11,6 +11,8 @@
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#include "common/file_util.h"
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#include "common/logging/log.h"
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#include "common/string_util.h"
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#include "core/file_sys/archive_ncch.h"
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#include "core/hle/service/fs/archive.h"
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#include "core/hw/aes/arithmetic128.h"
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#include "core/hw/aes/key.h"
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@ -85,6 +87,14 @@ AESKey HexToKey(const std::string& hex) {
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return key;
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}
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std::string KeyToString(AESKey& key) {
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std::string s;
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for (auto pos : key) {
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s += fmt::format("{:02X}", pos);
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}
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return s;
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}
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void LoadBootromKeys() {
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constexpr std::array<KeyDesc, 80> keys = {
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{{'X', 0x2C, false}, {'X', 0x2D, true}, {'X', 0x2E, true}, {'X', 0x2F, true},
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@ -137,11 +147,8 @@ void LoadBootromKeys() {
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}
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}
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std::string s;
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for (auto pos : new_key) {
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s += fmt::format("{:02X}", pos);
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}
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LOG_DEBUG(HW_AES, "Loaded Slot{:#02x} Key{}: {}", key.slot_id, key.key_type, s);
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LOG_DEBUG(HW_AES, "Loaded Slot{:#02x} Key{}: {}", key.slot_id, key.key_type,
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KeyToString(new_key));
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switch (key.key_type) {
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case 'X':
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@ -160,6 +167,52 @@ void LoadBootromKeys() {
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}
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}
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void LoadNativeFirmKeysOld3DS() {
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// Use the save mode native firm instead of the normal mode since there are only 2 version of it
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// and thus we can use fixed offsets
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constexpr u64_le save_mode_native_firm_id_low = 0x0004013800000003;
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FileSys::NCCHArchive archive(save_mode_native_firm_id_low, Service::FS::MediaType::NAND);
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std::array<char, 8> exefs_filepath = {'.', 'f', 'i', 'r', 'm', 0, 0, 0};
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FileSys::Path file_path = FileSys::MakeNCCHFilePath(
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FileSys::NCCHFileOpenType::NCCHData, 0, FileSys::NCCHFilePathType::ExeFS, exefs_filepath);
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FileSys::Mode open_mode = {};
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open_mode.read_flag.Assign(1);
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auto file_result = archive.OpenFile(file_path, open_mode);
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if (file_result.Failed())
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return;
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auto firm = std::move(file_result).Unwrap();
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const std::size_t size = firm->GetSize();
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if (size != 843776) {
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LOG_ERROR(HW_AES, "save mode native firm has wrong size {}", size);
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return;
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}
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std::vector<u8> firm_buffer(size);
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firm->Read(0, firm_buffer.size(), firm_buffer.data());
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firm->Close();
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AESKey key;
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constexpr std::size_t SLOT_0x31_KEY_Y_OFFSET = 817672;
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std::memcpy(key.data(), firm_buffer.data() + SLOT_0x31_KEY_Y_OFFSET, sizeof(key));
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key_slots.at(0x31).SetKeyY(key);
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LOG_DEBUG(HW_AES, "Loaded Slot0x31 KeyY: {}", KeyToString(key));
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auto LoadCommonKey = [&firm_buffer](std::size_t key_slot) -> AESKey {
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constexpr std::size_t START_OFFSET = 836533;
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constexpr std::size_t OFFSET = 0x14; // 0x10 bytes for key + 4 bytes between keys
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AESKey key;
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std::memcpy(key.data(), firm_buffer.data() + START_OFFSET + OFFSET * key_slot, sizeof(key));
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return key;
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};
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for (std::size_t key_slot{0}; key_slot < 6; ++key_slot) {
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AESKey key = LoadCommonKey(key_slot);
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common_key_y_slots[key_slot] = key;
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LOG_DEBUG(HW_AES, "Loaded common key{}: {}", key_slot, KeyToString(key));
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}
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}
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void LoadPresetKeys() {
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const std::string filepath = FileUtil::GetUserPath(FileUtil::UserPath::SysDataDir) + AES_KEYS;
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FileUtil::CreateFullPath(filepath); // Create path if not already created
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@ -234,6 +287,8 @@ void InitKeys() {
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if (initialized)
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return;
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LoadBootromKeys();
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LoadNativeFirmKeysOld3DS();
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// TODO(B3N30): Load new_3ds save_native_firm
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LoadPresetKeys();
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initialized = true;
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}
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