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// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <exception>
#include <sstream>
#include <boost/optional.hpp>
#include "common/common_paths.h"
#include "common/file_util.h"
#include "common/logging/log.h"
#include "common/string_util.h"
#include "core/hw/aes/arithmetic128.h"
#include "core/hw/aes/key.h"
namespace HW {
namespace AES {
namespace {
boost::optional<AESKey> generator_constant;
struct KeySlot {
boost::optional<AESKey> x;
boost::optional<AESKey> y;
boost::optional<AESKey> normal;
void SetKeyX(const AESKey& key) {
x = key;
if (y && generator_constant) {
GenerateNormalKey();
}
}
void SetKeyY(const AESKey& key) {
y = key;
if (x && generator_constant) {
GenerateNormalKey();
}
}
void SetNormalKey(const AESKey& key) {
normal = key;
}
void GenerateNormalKey() {
normal = Lrot128(Add128(Xor128(Lrot128(*x, 2), *y), *generator_constant), 87);
}
void Clear() {
x.reset();
y.reset();
normal.reset();
}
};
std::array<KeySlot, KeySlotID::MaxKeySlotID> key_slots;
void ClearAllKeys() {
for (KeySlot& slot : key_slots) {
slot.Clear();
}
generator_constant.reset();
}
AESKey HexToKey(const std::string& hex) {
if (hex.size() < 32) {
throw std::invalid_argument("hex string is too short");
}
AESKey key;
for (size_t i = 0; i < key.size(); ++i) {
key[i] = static_cast<u8>(std::stoi(hex.substr(i * 2, 2), 0, 16));
}
return key;
}
void LoadPresetKeys() {
const std::string filepath = FileUtil::GetUserPath(D_SYSDATA_IDX) + AES_KEYS;
FileUtil::CreateFullPath(filepath); // Create path if not already created
std::ifstream file;
OpenFStream(file, filepath, std::ios_base::in);
if (!file) {
return;
}
while (!file.eof()) {
std::string line;
std::getline(file, line);
std::vector<std::string> parts;
Common::SplitString(line, '=', parts);
if (parts.size() != 2) {
LOG_ERROR(HW_AES, "Failed to parse %s", line.c_str());
continue;
}
const std::string& name = parts[0];
AESKey key;
try {
key = HexToKey(parts[1]);
} catch (const std::logic_error& e) {
LOG_ERROR(HW_AES, "Invalid key %s: %s", parts[1].c_str(), e.what());
continue;
}
if (name == "generator") {
generator_constant = key;
continue;
}
size_t slot_id;
char key_type;
if (std::sscanf(name.c_str(), "slot0x%zXKey%c", &slot_id, &key_type) != 2) {
LOG_ERROR(HW_AES, "Invalid key name %s", name.c_str());
continue;
}
if (slot_id >= MaxKeySlotID) {
LOG_ERROR(HW_AES, "Out of range slot ID 0x%zX", slot_id);
continue;
}
switch (key_type) {
case 'X':
key_slots.at(slot_id).SetKeyX(key);
break;
case 'Y':
key_slots.at(slot_id).SetKeyY(key);
break;
case 'N':
key_slots.at(slot_id).SetNormalKey(key);
break;
default:
LOG_ERROR(HW_AES, "Invalid key type %c", key_type);
break;
}
}
}
} // namespace
void InitKeys() {
ClearAllKeys();
LoadPresetKeys();
}
void SetGeneratorConstant(const AESKey& key) {
generator_constant = key;
}
void SetKeyX(size_t slot_id, const AESKey& key) {
key_slots.at(slot_id).SetKeyX(key);
}
void SetKeyY(size_t slot_id, const AESKey& key) {
key_slots.at(slot_id).SetKeyY(key);
}
void SetNormalKey(size_t slot_id, const AESKey& key) {
key_slots.at(slot_id).SetNormalKey(key);
}
bool IsNormalKeyAvailable(size_t slot_id) {
return key_slots.at(slot_id).normal.is_initialized();
}
AESKey GetNormalKey(size_t slot_id) {
return key_slots.at(slot_id).normal.value_or(AESKey{});
}
} // namespace AES
} // namespace HW
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