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-rw-r--r--src/core/crypto/key_manager.cpp172
1 files changed, 165 insertions, 7 deletions
diff --git a/src/core/crypto/key_manager.cpp b/src/core/crypto/key_manager.cpp
index db8b22c85..0b6c07de8 100644
--- a/src/core/crypto/key_manager.cpp
+++ b/src/core/crypto/key_manager.cpp
@@ -12,11 +12,112 @@
#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();
@@ -24,12 +125,15 @@ KeyManager::KeyManager() {
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) {
@@ -56,17 +160,17 @@ void KeyManager::LoadFromFile(const std::string& filename, bool is_title_keys) {
u128 rights_id{};
std::memcpy(rights_id.data(), rights_id_raw.data(), rights_id_raw.size());
Key128 key = Common::HexStringToArray<16>(out[1]);
- SetKey(S128KeyType::Titlekey, key, rights_id[1], rights_id[0]);
+ 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]);
- SetKey(index.type, key, index.field1, index.field2);
+ 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]);
- SetKey(index.type, key, index.field1, index.field2);
+ s256_keys[{index.type, index.field1, index.field2}] = key;
}
}
}
@@ -100,11 +204,50 @@ Key256 KeyManager::GetKey(S256KeyType id, u64 field1, u64 field2) const {
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;
}
@@ -125,7 +268,16 @@ bool KeyManager::KeyFileExists(bool title) {
FileUtil::Exists(yuzu_keys_dir + DIR_SEP + "prod.keys");
}
-const std::unordered_map<std::string, KeyIndex<S128KeyType>> KeyManager::s128_file_id = {
+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}},
@@ -167,11 +319,17 @@ const std::unordered_map<std::string, KeyIndex<S128KeyType>> KeyManager::s128_fi
{"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 std::unordered_map<std::string, KeyIndex<S256KeyType>> KeyManager::s256_file_id = {
+const boost::container::flat_map<std::string, KeyIndex<S256KeyType>> KeyManager::s256_file_id = {
{"header_key", {S256KeyType::Header, 0, 0}},
- {"sd_card_save_key", {S256KeyType::SDSave, 0, 0}},
- {"sd_card_nca_key", {S256KeyType::SDNCA, 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
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-19 14:49:10 +0200