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Initial commit
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zhupengfei
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// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <exception>
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#include <optional>
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#include <string>
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#include <fmt/format.h>
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#include "common/file_util.h"
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#include "common/logging/log.h"
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#include "core/key/arithmetic128.h"
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#include "core/key/key.h"
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namespace Key {
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namespace {
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// The generator constant was calculated using the 0x39 KeyX and KeyY retrieved from a 3DS and the
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// normal key dumped from a Wii U solving the equation:
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// NormalKey = (((KeyX ROL 2) XOR KeyY) + constant) ROL 87
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// On a real 3DS the generation for the normal key is hardware based, and thus the constant can't
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// get dumped . generated normal keys are also not accesible on a 3DS. The used formula for
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// calculating the constant is a software implementation of what the hardware generator does.
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constexpr AESKey generator_constant = {{0x1F, 0xF9, 0xE9, 0xAA, 0xC5, 0xFE, 0x04, 0x08, 0x02, 0x45,
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0x91, 0xDC, 0x5D, 0x52, 0x76, 0x8A}};
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struct KeyDesc {
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char key_type;
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std::size_t slot_id;
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// This key is identical to the key with the same key_type and slot_id -1
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bool same_as_before;
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};
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AESKey HexToKey(const std::string& hex) {
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if (hex.size() < 32) {
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throw std::invalid_argument("hex string is too short");
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}
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AESKey key;
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for (std::size_t i = 0; i < key.size(); ++i) {
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key[i] = static_cast<u8>(std::stoi(hex.substr(i * 2, 2), 0, 16));
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}
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return key;
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}
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struct KeySlot {
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std::optional<AESKey> x;
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std::optional<AESKey> y;
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std::optional<AESKey> normal;
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void SetKeyX(std::optional<AESKey> key) {
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x = key;
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GenerateNormalKey();
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}
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void SetKeyY(std::optional<AESKey> key) {
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y = key;
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GenerateNormalKey();
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}
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void SetNormalKey(std::optional<AESKey> key) {
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normal = key;
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}
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void GenerateNormalKey() {
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if (x && y) {
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normal = Lrot128(Add128(Xor128(Lrot128(*x, 2), *y), generator_constant), 87);
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} else {
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normal = {};
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}
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}
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void Clear() {
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x.reset();
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y.reset();
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normal.reset();
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}
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};
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std::array<KeySlot, KeySlotID::MaxKeySlotID> key_slots;
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std::array<std::optional<AESKey>, 6> common_key_y_slots;
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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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} // namespace
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void LoadBootromKeys(const std::string& path) {
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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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{'X', 0x30, false}, {'X', 0x31, true}, {'X', 0x32, true}, {'X', 0x33, true},
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{'X', 0x34, false}, {'X', 0x35, true}, {'X', 0x36, true}, {'X', 0x37, true},
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{'X', 0x38, false}, {'X', 0x39, true}, {'X', 0x3A, true}, {'X', 0x3B, true},
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{'X', 0x3C, false}, {'X', 0x3D, false}, {'X', 0x3E, false}, {'X', 0x3F, false},
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{'Y', 0x4, false}, {'Y', 0x5, false}, {'Y', 0x6, false}, {'Y', 0x7, false},
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{'Y', 0x8, false}, {'Y', 0x9, false}, {'Y', 0xA, false}, {'Y', 0xB, false},
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{'N', 0xC, false}, {'N', 0xD, true}, {'N', 0xE, true}, {'N', 0xF, true},
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{'N', 0x10, false}, {'N', 0x11, true}, {'N', 0x12, true}, {'N', 0x13, true},
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{'N', 0x14, false}, {'N', 0x15, false}, {'N', 0x16, false}, {'N', 0x17, false},
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{'N', 0x18, false}, {'N', 0x19, true}, {'N', 0x1A, true}, {'N', 0x1B, true},
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{'N', 0x1C, false}, {'N', 0x1D, true}, {'N', 0x1E, true}, {'N', 0x1F, true},
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{'N', 0x20, false}, {'N', 0x21, true}, {'N', 0x22, true}, {'N', 0x23, true},
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{'N', 0x24, false}, {'N', 0x25, true}, {'N', 0x26, true}, {'N', 0x27, true},
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{'N', 0x28, true}, {'N', 0x29, false}, {'N', 0x2A, false}, {'N', 0x2B, false},
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{'N', 0x2C, false}, {'N', 0x2D, true}, {'N', 0x2E, true}, {'N', 0x2F, true},
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{'N', 0x30, false}, {'N', 0x31, true}, {'N', 0x32, true}, {'N', 0x33, true},
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{'N', 0x34, false}, {'N', 0x35, true}, {'N', 0x36, true}, {'N', 0x37, true},
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{'N', 0x38, false}, {'N', 0x39, true}, {'N', 0x3A, true}, {'N', 0x3B, true},
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{'N', 0x3C, true}, {'N', 0x3D, false}, {'N', 0x3E, false}, {'N', 0x3F, false}}};
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// Bootrom sets all these keys when executed, but later some of the normal keys get overwritten
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// by other applications e.g. process9. These normal keys thus aren't used by any application
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// and have no value for emulation
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auto file = FileUtil::IOFile(path, "rb");
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if (!file) {
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return;
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}
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const std::size_t length = file.GetSize();
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if (length != 65536) {
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LOG_ERROR(Key, "Bootrom9 size is wrong: {}", length);
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return;
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}
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constexpr std::size_t KEY_SECTION_START = 55760;
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file.Seek(KEY_SECTION_START, SEEK_SET); // Jump to the key section
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AESKey new_key;
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for (const auto& key : keys) {
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if (!key.same_as_before) {
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file.ReadArray(new_key.data(), new_key.size());
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if (!file) {
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LOG_ERROR(Key, "Reading from Bootrom9 failed");
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return;
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}
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}
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LOG_DEBUG(Key, "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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key_slots.at(key.slot_id).SetKeyX(new_key);
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break;
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case 'Y':
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key_slots.at(key.slot_id).SetKeyY(new_key);
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break;
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case 'N':
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key_slots.at(key.slot_id).SetNormalKey(new_key);
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break;
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default:
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LOG_ERROR(Key, "Invalid key type {}", key.key_type);
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break;
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}
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}
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}
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void LoadMovableSedKeys(const std::string& path) {
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auto file = FileUtil::IOFile(path, "rb");
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if (!file) {
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return;
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}
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const std::size_t length = file.GetSize();
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if (length < 0x120) {
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LOG_ERROR(Key, "movable.sed size is too small: {}", length);
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return;
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}
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constexpr std::size_t KEY_SECTION_START = 0x118;
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file.Seek(KEY_SECTION_START, SEEK_SET); // Jump to the key section
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AESKey key;
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file.ReadArray(key.data(), key.size());
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if (!file) {
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LOG_ERROR(Key, "Reading from movable.sed failed");
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return;
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}
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SetKeyY(0x26, key);
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}
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void SetKeyX(std::size_t slot_id, const AESKey& key) {
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key_slots.at(slot_id).SetKeyX(key);
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}
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void SetKeyY(std::size_t slot_id, const AESKey& key) {
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key_slots.at(slot_id).SetKeyY(key);
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}
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void SetNormalKey(std::size_t slot_id, const AESKey& key) {
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key_slots.at(slot_id).SetNormalKey(key);
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}
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bool IsNormalKeyAvailable(std::size_t slot_id) {
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return key_slots.at(slot_id).normal.has_value();
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}
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AESKey GetNormalKey(std::size_t slot_id) {
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return key_slots.at(slot_id).normal.value_or(AESKey{});
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}
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void SelectCommonKeyIndex(u8 index) {
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key_slots[KeySlotID::TicketCommonKey].SetKeyY(common_key_y_slots.at(index));
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}
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} // namespace Key
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