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-rw-r--r--src/core/crypto/key_manager.cpp114
-rw-r--r--src/core/crypto/key_manager.h26
2 files changed, 135 insertions, 5 deletions
diff --git a/src/core/crypto/key_manager.cpp b/src/core/crypto/key_manager.cpp
index 95158e630..e4b33f750 100644
--- a/src/core/crypto/key_manager.cpp
+++ b/src/core/crypto/key_manager.cpp
@@ -12,11 +12,105 @@
#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)),
+ };
+
+ AESCipher<Key128> cipher(sd_kek, Mode::ECB);
+ for (size_t i = 0; i < 2; ++i) {
+ for (size_t j = 0; j < 0x20; ++j)
+ sd_key_sources[i][j] ^= sd_seed[j & 0xF];
+ cipher.Transcode(sd_key_sources[i].data(), sd_key_sources[i].size(), sd_keys[i].data(),
+ Op::Decrypt);
+ }
+
+ return Loader::ResultStatus::Success;
+}
+
KeyManager::KeyManager() {
// Initialize keys
const std::string hactool_keys_dir = FileUtil::GetHactoolConfigurationPath();
@@ -24,12 +118,15 @@ 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", false);
}
void KeyManager::LoadFromFile(const std::string& filename, bool is_title_keys) {
@@ -126,6 +223,13 @@ bool KeyManager::KeyFileExists(bool title) {
}
void KeyManager::DeriveSDSeedLazy() {
+ if (!HasKey(S128KeyType::SDSeed)) {
+ 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}},
@@ -168,11 +272,17 @@ const boost::container::flat_map<std::string, KeyIndex<S128KeyType>> KeyManager:
{"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", {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
diff --git a/src/core/crypto/key_manager.h b/src/core/crypto/key_manager.h
index 33b1ad383..31040dc55 100644
--- a/src/core/crypto/key_manager.h
+++ b/src/core/crypto/key_manager.h
@@ -23,9 +23,8 @@ static_assert(sizeof(Key128) == 16, "Key128 must be 128 bytes big.");
static_assert(sizeof(Key256) == 32, "Key128 must be 128 bytes big.");
enum class S256KeyType : u64 {
- Header, //
- SDSave, //
- SDNCA, //
+ Header, //
+ SDKeySource, // f1=SDKeyType
};
enum class S128KeyType : u64 {
@@ -37,6 +36,7 @@ enum class S128KeyType : u64 {
KeyArea, // f1=crypto revision f2=type {app, ocean, system}
SDSeed, //
Titlekey, // f1=rights id LSB f2=rights id MSB
+ Source, // f1=source type, f2= sub id
};
enum class KeyAreaKeyType : u8 {
@@ -45,6 +45,17 @@ enum class KeyAreaKeyType : u8 {
System,
};
+enum class SourceKeyType : u8 {
+ SDKEK,
+ AESKEKGeneration,
+ AESKeyGeneration,
+};
+
+enum class SDKeyType : u8 {
+ Save,
+ NCA,
+};
+
template <typename KeyType>
struct KeyIndex {
KeyType type;
@@ -83,6 +94,10 @@ public:
static bool KeyFileExists(bool title);
+ // Call before using the sd seed to attempt to derive it if it dosen't exist. Needs system save
+ // 8*43 and the private file to exist.
+ void DeriveSDSeedLazy();
+
private:
boost::container::flat_map<KeyIndex<S128KeyType>, Key128> s128_keys;
boost::container::flat_map<KeyIndex<S256KeyType>, Key256> s256_keys;
@@ -95,4 +110,9 @@ private:
static const boost::container::flat_map<std::string, KeyIndex<S128KeyType>> s128_file_id;
static const boost::container::flat_map<std::string, KeyIndex<S256KeyType>> s256_file_id;
};
+
+Key128 GenerateKeyEncryptionKey(Key128 source, Key128 master, Key128 kek_seed, Key128 key_seed);
+boost::optional<Key128> DeriveSDSeed();
+Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, const KeyManager& keys);
+
} // namespace Core::Crypto
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 05:54:11 +0100