From 15c9db08835cac26e17c3d0657fae400401fff6d Mon Sep 17 00:00:00 2001 From: B3n30 Date: Sun, 14 Oct 2018 00:06:39 +0200 Subject: [PATCH] Load keys from the o3DS save mode native firm --- src/core/hw/aes/key.cpp | 65 +++++++++++++++++++++++++++++++++++++---- 1 file changed, 60 insertions(+), 5 deletions(-) diff --git a/src/core/hw/aes/key.cpp b/src/core/hw/aes/key.cpp index b69aad977..eb0518111 100644 --- a/src/core/hw/aes/key.cpp +++ b/src/core/hw/aes/key.cpp @@ -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 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 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 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; }