// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <array>
#include <fstream>
#include <locale>
#include <sstream>
#include <string_view>
#include "common/common_paths.h"
#include "common/file_util.h"
#include "common/hex_util.h"
#include "common/logging/log.h"
#include "core/crypto/aes_util.h"
#include "core/crypto/key_manager.h"
#include "core/settings.h"
namespace Core::Crypto {
Key128 GenerateKeyEncryptionKey(Key128 source, Key128 master, Key128 kek_seed, Key128 key_seed) {
Key128 out{};
AESCipher<Key128> cipher1(master, Mode::ECB);
cipher1.Transcode(kek_seed.data(), kek_seed.size(), out.data(), Op::Decrypt);
AESCipher<Key128> cipher2(out, Mode::ECB);
cipher2.Transcode(source.data(), source.size(), out.data(), Op::Decrypt);
if (key_seed != Key128{}) {
AESCipher<Key128> cipher3(out, Mode::ECB);
cipher3.Transcode(key_seed.data(), key_seed.size(), out.data(), Op::Decrypt);
}
return out;
}
boost::optional<Key128> DeriveSDSeed() {
const FileUtil::IOFile save_43(FileUtil::GetUserPath(FileUtil::UserPath::NANDDir) +
"/system/save/8000000000000043",
"rb+");
if (!save_43.IsOpen())
return boost::none;
const FileUtil::IOFile sd_private(
FileUtil::GetUserPath(FileUtil::UserPath::SDMCDir) + "/Nintendo/Contents/private", "rb+");
if (!sd_private.IsOpen())
return boost::none;
sd_private.Seek(0, SEEK_SET);
std::array<u8, 0x10> private_seed{};
if (sd_private.ReadBytes(private_seed.data(), private_seed.size()) != 0x10)
return boost::none;
std::array<u8, 0x10> buffer{};
size_t offset = 0;
for (; offset + 0x10 < save_43.GetSize(); ++offset) {
save_43.Seek(offset, SEEK_SET);
save_43.ReadBytes(buffer.data(), buffer.size());
if (buffer == private_seed)
break;
}
if (offset + 0x10 >= save_43.GetSize())
return boost::none;
Key128 seed{};
save_43.Seek(offset + 0x10, SEEK_SET);
save_43.ReadBytes(seed.data(), seed.size());
return seed;
}
Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, const KeyManager& keys) {
if (!keys.HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::SDKEK)))
return Loader::ResultStatus::ErrorMissingSDKEKSource;
if (!keys.HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKEKGeneration)))
return Loader::ResultStatus::ErrorMissingAESKEKGenerationSource;
if (!keys.HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKeyGeneration)))
return Loader::ResultStatus::ErrorMissingAESKeyGenerationSource;
const auto sd_kek_source =
keys.GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::SDKEK));
const auto aes_kek_gen =
keys.GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKEKGeneration));
const auto aes_key_gen =
keys.GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKeyGeneration));
const auto master_00 = keys.GetKey(S128KeyType::Master);
const auto sd_kek =
GenerateKeyEncryptionKey(sd_kek_source, master_00, aes_kek_gen, aes_key_gen);
if (!keys.HasKey(S128KeyType::SDSeed))
return Loader::ResultStatus::ErrorMissingSDSeed;
const auto sd_seed = keys.GetKey(S128KeyType::SDSeed);
if (!keys.HasKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::Save)))
return Loader::ResultStatus::ErrorMissingSDSaveKeySource;
if (!keys.HasKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::NCA)))
return Loader::ResultStatus::ErrorMissingSDNCAKeySource;
std::array<Key256, 2> sd_key_sources{
keys.GetKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::Save)),
keys.GetKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::NCA)),
};
// Combine sources and seed
for (auto& source : sd_key_sources) {
for (size_t i = 0; i < source.size(); ++i)
source[i] ^= sd_seed[i & 0xF];
}
AESCipher<Key128> cipher(sd_kek, Mode::ECB);
// The transform manipulates sd_keys as part of the Transcode, so the return/output is
// unnecessary. This does not alter sd_keys_sources.
std::transform(sd_key_sources.begin(), sd_key_sources.end(), sd_keys.begin(),
sd_key_sources.begin(), [&cipher](const Key256& source, Key256& out) {
cipher.Transcode(source.data(), source.size(), out.data(), Op::Decrypt);
return source; ///< Return unaltered source to satisfy output requirement.
});
return Loader::ResultStatus::Success;
}
KeyManager::KeyManager() {
// Initialize keys
const std::string hactool_keys_dir = FileUtil::GetHactoolConfigurationPath();
const std::string yuzu_keys_dir = FileUtil::GetUserPath(FileUtil::UserPath::KeysDir);
if (Settings::values.use_dev_keys) {
dev_mode = true;
AttemptLoadKeyFile(yuzu_keys_dir, hactool_keys_dir, "dev.keys", false);
AttemptLoadKeyFile(yuzu_keys_dir, yuzu_keys_dir, "dev.keys_autogenerated", false);
} else {
dev_mode = false;
AttemptLoadKeyFile(yuzu_keys_dir, hactool_keys_dir, "prod.keys", false);
AttemptLoadKeyFile(yuzu_keys_dir, yuzu_keys_dir, "prod.keys_autogenerated", false);
}
AttemptLoadKeyFile(yuzu_keys_dir, hactool_keys_dir, "title.keys", true);
AttemptLoadKeyFile(yuzu_keys_dir, yuzu_keys_dir, "title.keys_autogenerated", true);
}
void KeyManager::LoadFromFile(const std::string& filename, bool is_title_keys) {
std::ifstream file(filename);
if (!file.is_open())
return;
std::string line;
while (std::getline(file, line)) {
std::vector<std::string> out;
std::stringstream stream(line);
std::string item;
while (std::getline(stream, item, '='))
out.push_back(std::move(item));
if (out.size() != 2)
continue;
out[0].erase(std::remove(out[0].begin(), out[0].end(), ' '), out[0].end());
out[1].erase(std::remove(out[1].begin(), out[1].end(), ' '), out[1].end());
if (is_title_keys) {
auto rights_id_raw = Common::HexStringToArray<16>(out[0]);
u128 rights_id{};
std::memcpy(rights_id.data(), rights_id_raw.data(), rights_id_raw.size());
Key128 key = Common::HexStringToArray<16>(out[1]);
s128_keys[{S128KeyType::Titlekey, rights_id[1], rights_id[0]}] = key;
} else {
std::transform(out[0].begin(), out[0].end(), out[0].begin(), ::tolower);
if (s128_file_id.find(out[0]) != s128_file_id.end()) {
const auto index = s128_file_id.at(out[0]);
Key128 key = Common::HexStringToArray<16>(out[1]);
s128_keys[{index.type, index.field1, index.field2}] = key;
} else if (s256_file_id.find(out[0]) != s256_file_id.end()) {
const auto index = s256_file_id.at(out[0]);
Key256 key = Common::HexStringToArray<32>(out[1]);
s256_keys[{index.type, index.field1, index.field2}] = key;
}
}
}
}
void KeyManager::AttemptLoadKeyFile(const std::string& dir1, const std::string& dir2,
const std::string& filename, bool title) {
if (FileUtil::Exists(dir1 + DIR_SEP + filename))
LoadFromFile(dir1 + DIR_SEP + filename, title);
else if (FileUtil::Exists(dir2 + DIR_SEP + filename))
LoadFromFile(dir2 + DIR_SEP + filename, title);
}
bool KeyManager::HasKey(S128KeyType id, u64 field1, u64 field2) const {
return s128_keys.find({id, field1, field2}) != s128_keys.end();
}
bool KeyManager::HasKey(S256KeyType id, u64 field1, u64 field2) const {
return s256_keys.find({id, field1, field2}) != s256_keys.end();
}
Key128 KeyManager::GetKey(S128KeyType id, u64 field1, u64 field2) const {
if (!HasKey(id, field1, field2))
return {};
return s128_keys.at({id, field1, field2});
}
Key256 KeyManager::GetKey(S256KeyType id, u64 field1, u64 field2) const {
if (!HasKey(id, field1, field2))
return {};
return s256_keys.at({id, field1, field2});
}
template <size_t Size>
void KeyManager::WriteKeyToFile(bool title_key, std::string_view keyname,
const std::array<u8, Size>& key) {
const std::string yuzu_keys_dir = FileUtil::GetUserPath(FileUtil::UserPath::KeysDir);
std::string filename = "title.keys_autogenerated";
if (!title_key)
filename = dev_mode ? "dev.keys_autogenerated" : "prod.keys_autogenerated";
const auto add_info_text = !FileUtil::Exists(yuzu_keys_dir + DIR_SEP + filename);
FileUtil::CreateFullPath(yuzu_keys_dir + DIR_SEP + filename);
std::ofstream file(yuzu_keys_dir + DIR_SEP + filename, std::ios::app);
if (!file.is_open())
return;
if (add_info_text) {
file
<< "# This file is autogenerated by Yuzu\n"
<< "# It serves to store keys that were automatically generated from the normal keys\n"
<< "# If you are experiencing issues involving keys, it may help to delete this file\n";
}
file << fmt::format("\n{} = {}", keyname, Common::HexArrayToString(key));
AttemptLoadKeyFile(yuzu_keys_dir, yuzu_keys_dir, filename, title_key);
}
void KeyManager::SetKey(S128KeyType id, Key128 key, u64 field1, u64 field2) {
const auto iter = std::find_if(
s128_file_id.begin(), s128_file_id.end(),
[&id, &field1, &field2](const std::pair<std::string, KeyIndex<S128KeyType>> elem) {
return std::tie(elem.second.type, elem.second.field1, elem.second.field2) ==
std::tie(id, field1, field2);
});
if (iter != s128_file_id.end())
WriteKeyToFile(id == S128KeyType::Titlekey, iter->first, key);
s128_keys[{id, field1, field2}] = key;
}
void KeyManager::SetKey(S256KeyType id, Key256 key, u64 field1, u64 field2) {
const auto iter = std::find_if(
s256_file_id.begin(), s256_file_id.end(),
[&id, &field1, &field2](const std::pair<std::string, KeyIndex<S256KeyType>> elem) {
return std::tie(elem.second.type, elem.second.field1, elem.second.field2) ==
std::tie(id, field1, field2);
});
if (iter != s256_file_id.end())
WriteKeyToFile(false, iter->first, key);
s256_keys[{id, field1, field2}] = key;
}
bool KeyManager::KeyFileExists(bool title) {
const std::string hactool_keys_dir = FileUtil::GetHactoolConfigurationPath();
const std::string yuzu_keys_dir = FileUtil::GetUserPath(FileUtil::UserPath::KeysDir);
if (title) {
return FileUtil::Exists(hactool_keys_dir + DIR_SEP + "title.keys") ||
FileUtil::Exists(yuzu_keys_dir + DIR_SEP + "title.keys");
}
if (Settings::values.use_dev_keys) {
return FileUtil::Exists(hactool_keys_dir + DIR_SEP + "dev.keys") ||
FileUtil::Exists(yuzu_keys_dir + DIR_SEP + "dev.keys");
}
return FileUtil::Exists(hactool_keys_dir + DIR_SEP + "prod.keys") ||
FileUtil::Exists(yuzu_keys_dir + DIR_SEP + "prod.keys");
}
void KeyManager::DeriveSDSeedLazy() {
if (HasKey(S128KeyType::SDSeed))
return;
const auto res = DeriveSDSeed();
if (res != boost::none)
SetKey(S128KeyType::SDSeed, res.get());
}
const boost::container::flat_map<std::string, KeyIndex<S128KeyType>> KeyManager::s128_file_id = {
{"master_key_00", {S128KeyType::Master, 0, 0}},
{"master_key_01", {S128KeyType::Master, 1, 0}},
{"master_key_02", {S128KeyType::Master, 2, 0}},
{"master_key_03", {S128KeyType::Master, 3, 0}},
{"master_key_04", {S128KeyType::Master, 4, 0}},
{"package1_key_00", {S128KeyType::Package1, 0, 0}},
{"package1_key_01", {S128KeyType::Package1, 1, 0}},
{"package1_key_02", {S128KeyType::Package1, 2, 0}},
{"package1_key_03", {S128KeyType::Package1, 3, 0}},
{"package1_key_04", {S128KeyType::Package1, 4, 0}},
{"package2_key_00", {S128KeyType::Package2, 0, 0}},
{"package2_key_01", {S128KeyType::Package2, 1, 0}},
{"package2_key_02", {S128KeyType::Package2, 2, 0}},
{"package2_key_03", {S128KeyType::Package2, 3, 0}},
{"package2_key_04", {S128KeyType::Package2, 4, 0}},
{"titlekek_00", {S128KeyType::Titlekek, 0, 0}},
{"titlekek_01", {S128KeyType::Titlekek, 1, 0}},
{"titlekek_02", {S128KeyType::Titlekek, 2, 0}},
{"titlekek_03", {S128KeyType::Titlekek, 3, 0}},
{"titlekek_04", {S128KeyType::Titlekek, 4, 0}},
{"eticket_rsa_kek", {S128KeyType::ETicketRSAKek, 0, 0}},
{"key_area_key_application_00",
{S128KeyType::KeyArea, 0, static_cast<u64>(KeyAreaKeyType::Application)}},
{"key_area_key_application_01",
{S128KeyType::KeyArea, 1, static_cast<u64>(KeyAreaKeyType::Application)}},
{"key_area_key_application_02",
{S128KeyType::KeyArea, 2, static_cast<u64>(KeyAreaKeyType::Application)}},
{"key_area_key_application_03",
{S128KeyType::KeyArea, 3, static_cast<u64>(KeyAreaKeyType::Application)}},
{"key_area_key_application_04",
{S128KeyType::KeyArea, 4, static_cast<u64>(KeyAreaKeyType::Application)}},
{"key_area_key_ocean_00", {S128KeyType::KeyArea, 0, static_cast<u64>(KeyAreaKeyType::Ocean)}},
{"key_area_key_ocean_01", {S128KeyType::KeyArea, 1, static_cast<u64>(KeyAreaKeyType::Ocean)}},
{"key_area_key_ocean_02", {S128KeyType::KeyArea, 2, static_cast<u64>(KeyAreaKeyType::Ocean)}},
{"key_area_key_ocean_03", {S128KeyType::KeyArea, 3, static_cast<u64>(KeyAreaKeyType::Ocean)}},
{"key_area_key_ocean_04", {S128KeyType::KeyArea, 4, static_cast<u64>(KeyAreaKeyType::Ocean)}},
{"key_area_key_system_00", {S128KeyType::KeyArea, 0, static_cast<u64>(KeyAreaKeyType::System)}},
{"key_area_key_system_01", {S128KeyType::KeyArea, 1, static_cast<u64>(KeyAreaKeyType::System)}},
{"key_area_key_system_02", {S128KeyType::KeyArea, 2, static_cast<u64>(KeyAreaKeyType::System)}},
{"key_area_key_system_03", {S128KeyType::KeyArea, 3, static_cast<u64>(KeyAreaKeyType::System)}},
{"key_area_key_system_04", {S128KeyType::KeyArea, 4, static_cast<u64>(KeyAreaKeyType::System)}},
{"sd_card_kek_source", {S128KeyType::Source, static_cast<u64>(SourceKeyType::SDKEK), 0}},
{"aes_kek_generation_source",
{S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKEKGeneration), 0}},
{"aes_key_generation_source",
{S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKeyGeneration), 0}},
{"sd_seed", {S128KeyType::SDSeed, 0, 0}},
};
const boost::container::flat_map<std::string, KeyIndex<S256KeyType>> KeyManager::s256_file_id = {
{"header_key", {S256KeyType::Header, 0, 0}},
{"sd_card_save_key_source", {S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::Save), 0}},
{"sd_card_nca_key_source", {S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::NCA), 0}},
};
} // namespace Core::Crypto
