added support for loading aeskeydb.bin to the aes code

This is an ammendment to pull request #2569 to allow it to both load from the text file and load from aeskeydb.bin. It contains if statements within the switch cases to check if the key is already initialized

src/common/common_paths.h

@@ -46,3 +46,4 @@
 // Sys files
 #define SHARED_FONT "shared_font.bin"
 #define AES_KEYS "aes_keys.txt"
+#define AES_KEYS_DB "aeskeydb.bin"

src/core/hw/aes/key.cpp

@@ -76,7 +76,29 @@ AESKey HexToKey(const std::string& hex) {
     return key;
 }
 
-void LoadPresetKeys() {
+void SetKeySlot(const AESKey& key, size_t slot_id, char key_type) {
+    switch (key_type) {
+    case 'X':
+        if (!key_slots.at(slot_id).x.is_initialized()) {
+            SetKeyX(slot_id, key);
+        }
+        break;
+    case 'Y':
+        if (!key_slots.at(slot_id).y.is_initialized()) {
+            SetKeyY(slot_id, key);
+        }
+        break;
+    case 'N':
+        if (!key_slots.at(slot_id).normal.is_initialized()) {
+            SetNormalKey(slot_id, key);
+        }
+        break;
+    default:
+        LOG_ERROR(HW_AES, "Invalid key type %c", key_type);
+        break;
+    }
+}
+void LoadKeysFromText() {
     const std::string filepath = FileUtil::GetUserPath(D_SYSDATA_IDX) + AES_KEYS;
     FileUtil::CreateFullPath(filepath); // Create path if not already created
     std::ifstream file;
@@ -121,21 +143,44 @@ void LoadPresetKeys() {
             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;
+        SetKeySlot(key, slot_id, key_type);
     }
+}
+/*
+ * This is used to load the aeskeydb.bin file from the sysdata directory.
+ * This file comes from Decrypt9 and can be built using the Build Key Database option.
+ * It requires bin files containing the key data following the format slot0x??key?.bin.
+ * The wiki describes that this database can be encrypted or decrypted however as of right now only
+ * the decrypted format is supported.
+ */
+void LoadKeysFromDB() {
+    // aeskeydb.bin struct taken from https://git.io/vyzHF
+    struct AesKeyInfo {
+        u8 slot;                 // keyslot, 0x00...0x3F
+        char type;               // type 'X' / 'Y' / 'N' for normalKey
+        std::array<char, 10> id; // key ID for special keys, all zero for standard keys
+        u8 reserved[2];          // reserved space
+        u8 is_devkitkey;         // 0 for retail units / 1 for DevKit units
+        u8 is_encrypted;         // 0 if not / anything else if it is
+        AESKey key;
+    };
+
+    const std::string filepath = FileUtil::GetUserPath(D_SYSDATA_IDX) + AES_KEYS_DB;
+    FileUtil::CreateFullPath(filepath); // Create path if not already created
+    std::ifstream file;
+    OpenFStream(file, filepath, std::ios_base::in);
+    if (!file) {
+        return;
     }
+    AesKeyInfo key_info;
+    while (!file.eof()) {
+        file.read((char*)&key_info, sizeof(key_info));
+        SetKeySlot(key_info.key, key_info.slot, key_info.type);
+    }
+}
+void LoadPresetKeys() {
+    LoadKeysFromText();
+    LoadKeysFromDB();
 }
 
 } // namespace