Storing encryption trophy key in config.toml (#1930)

* get trophy key from toml file

* clang format fix

* get trophy key from toml file

* clang format fix

* merge fixes

* Update config.cpp

src/common/config.cpp

@@ -67,6 +67,7 @@ static int cursorHideTimeout = 5; // 5 seconds (default)
 static bool separateupdatefolder = false;
 static bool compatibilityData = false;
 static bool checkCompatibilityOnStartup = false;
+static std::string trophyKey = "";
 
 // Gui
 std::vector<std::filesystem::path> settings_install_dirs = {};
@@ -91,6 +92,14 @@ std::string emulator_language = "en";
 // Language
 u32 m_language = 1; // english
 
+std::string getTrophyKey() {
+    return trophyKey;
+}
+
+void setTrophyKey(std::string key) {
+    trophyKey = key;
+}
+
 bool isNeoMode() {
     return isNeo;
 }
@@ -652,6 +661,11 @@ void load(const std::filesystem::path& path) {
 
         m_language = toml::find_or<int>(settings, "consoleLanguage", 1);
     }
+
+    if (data.contains("Keys")) {
+        const toml::value& keys = data.at("Keys");
+        trophyKey = toml::find_or<std::string>(keys, "TrophyKey", "");
+    }
 }
 
 void save(const std::filesystem::path& path) {
@@ -712,6 +726,8 @@ void save(const std::filesystem::path& path) {
     data["Debug"]["DebugDump"] = isDebugDump;
     data["Debug"]["CollectShader"] = isShaderDebug;
 
+    data["Keys"]["TrophyKey"] = trophyKey;
+
     std::vector<std::string> install_dirs;
     for (const auto& dirString : settings_install_dirs) {
         install_dirs.emplace_back(std::string{fmt::UTF(dirString.u8string()).data});

src/common/config.h

@@ -15,6 +15,9 @@ void load(const std::filesystem::path& path);
 void save(const std::filesystem::path& path);
 void saveMainWindow(const std::filesystem::path& path);
 
+std::string getTrophyKey();
+void setTrophyKey(std::string key);
+
 bool isNeoMode();
 bool isFullscreenMode();
 bool getPlayBGM();

src/core/crypto/crypto.cpp

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <array>
+#include <common/config.h>
 #include "crypto.h"
 
 CryptoPP::RSA::PrivateKey Crypto::key_pkg_derived_key3_keyset_init() {
@@ -137,6 +138,13 @@ void Crypto::aesCbcCfb128DecryptEntry(std::span<const CryptoPP::byte, 32> ivkey,
     }
 }
 
+static void hexToBytes(const char* hex, unsigned char* dst) {
+    for (size_t i = 0; hex[i] != 0; i++) {
+        const unsigned char value = (hex[i] < 0x3A) ? (hex[i] - 0x30) : (hex[i] - 0x37);
+        dst[i / 2] |= ((i % 2) == 0) ? (value << 4) : (value);
+    }
+}
+
 void Crypto::decryptEFSM(std::span<CryptoPP::byte, 16> NPcommID,
                          std::span<CryptoPP::byte, 16> efsmIv, std::span<CryptoPP::byte> ciphertext,
                          std::span<CryptoPP::byte> decrypted) {
@@ -145,9 +153,15 @@ void Crypto::decryptEFSM(std::span<CryptoPP::byte, 16> NPcommID,
     // step 1: Encrypt NPcommID
     CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption encrypt;
 
+    const char* TrophyKeyget = Config::getTrophyKey().c_str();
+    std::vector<CryptoPP::byte> TrophyKey;
+    hexToBytes(TrophyKeyget, TrophyKey.data());
+
     std::vector<CryptoPP::byte> trpKey(16);
 
     encrypt.ProcessData(trpKey.data(), NPcommID.data(), 16);
+    encrypt.SetKeyWithIV(TrophyKey.data(), TrophyKey.size(), TrophyIV.data());
+
     // step 2: decrypt efsm.
     CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption decrypt;
     decrypt.SetKeyWithIV(trpKey.data(), trpKey.size(), efsmIv.data());