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Load keys from the o3DS save mode native firm

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This commit is contained in:
B3n30 2018-10-14 00:06:39 +02:00
parent 1849e8b09c
commit 15c9db0883
1 changed files with 60 additions and 5 deletions
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65
src/core/hw/aes/key.cpp
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@ -11,6 +11,8 @@
#include "common/file_util.h"
#include "common/logging/log.h"
#include "common/string_util.h"
#include "core/file_sys/archive_ncch.h"
#include "core/hle/service/fs/archive.h"
#include "core/hw/aes/arithmetic128.h"
#include "core/hw/aes/key.h"
@ -85,6 +87,14 @@ AESKey HexToKey(const std::string& hex) {
return key;
}
std::string KeyToString(AESKey& key) {
std::string s;
for (auto pos : key) {
s += fmt::format("{:02X}", pos);
}
return s;
}
void LoadBootromKeys() {
constexpr std::array<KeyDesc, 80> keys = {
{{'X', 0x2C, false}, {'X', 0x2D, true}, {'X', 0x2E, true}, {'X', 0x2F, true},
@ -137,11 +147,8 @@ void LoadBootromKeys() {
}
}
std::string s;
for (auto pos : new_key) {
s += fmt::format("{:02X}", pos);
}
LOG_DEBUG(HW_AES, "Loaded Slot{:#02x} Key{}: {}", key.slot_id, key.key_type, s);
LOG_DEBUG(HW_AES, "Loaded Slot{:#02x} Key{}: {}", key.slot_id, key.key_type,
KeyToString(new_key));
switch (key.key_type) {
case 'X':
@ -160,6 +167,52 @@ void LoadBootromKeys() {
}
}
void LoadNativeFirmKeysOld3DS() {
// Use the save mode native firm instead of the normal mode since there are only 2 version of it
// and thus we can use fixed offsets
constexpr u64_le save_mode_native_firm_id_low = 0x0004013800000003;
FileSys::NCCHArchive archive(save_mode_native_firm_id_low, Service::FS::MediaType::NAND);
std::array<char, 8> exefs_filepath = {'.', 'f', 'i', 'r', 'm', 0, 0, 0};
FileSys::Path file_path = FileSys::MakeNCCHFilePath(
FileSys::NCCHFileOpenType::NCCHData, 0, FileSys::NCCHFilePathType::ExeFS, exefs_filepath);
FileSys::Mode open_mode = {};
open_mode.read_flag.Assign(1);
auto file_result = archive.OpenFile(file_path, open_mode);
if (file_result.Failed())
return;
auto firm = std::move(file_result).Unwrap();
const std::size_t size = firm->GetSize();
if (size != 843776) {
LOG_ERROR(HW_AES, "save mode native firm has wrong size {}", size);
return;
}
std::vector<u8> firm_buffer(size);
firm->Read(0, firm_buffer.size(), firm_buffer.data());
firm->Close();
AESKey key;
constexpr std::size_t SLOT_0x31_KEY_Y_OFFSET = 817672;
std::memcpy(key.data(), firm_buffer.data() + SLOT_0x31_KEY_Y_OFFSET, sizeof(key));
key_slots.at(0x31).SetKeyY(key);
LOG_DEBUG(HW_AES, "Loaded Slot0x31 KeyY: {}", KeyToString(key));
auto LoadCommonKey = [&firm_buffer](std::size_t key_slot) -> AESKey {
constexpr std::size_t START_OFFSET = 836533;
constexpr std::size_t OFFSET = 0x14; // 0x10 bytes for key + 4 bytes between keys
AESKey key;
std::memcpy(key.data(), firm_buffer.data() + START_OFFSET + OFFSET * key_slot, sizeof(key));
return key;
};
for (std::size_t key_slot{0}; key_slot < 6; ++key_slot) {
AESKey key = LoadCommonKey(key_slot);
common_key_y_slots[key_slot] = key;
LOG_DEBUG(HW_AES, "Loaded common key{}: {}", key_slot, KeyToString(key));
}
}
void LoadPresetKeys() {
const std::string filepath = FileUtil::GetUserPath(FileUtil::UserPath::SysDataDir) + AES_KEYS;
FileUtil::CreateFullPath(filepath); // Create path if not already created
@ -234,6 +287,8 @@ void InitKeys() {
if (initialized)
return;
LoadBootromKeys();
LoadNativeFirmKeysOld3DS();
// TODO(B3N30): Load new_3ds save_native_firm
LoadPresetKeys();
initialized = true;
}