Add a dictionary for Encryption public keys (#1862)

src/main/java/emu/grasscutter/server/http/dispatch/RegionHandler.java

@@ -154,8 +154,12 @@ public final class RegionHandler implements Router {
                 }
 
                 String key_id = ctx.queryParam("key_id");
+
+                if(key_id == null)
+                    throw new Exception("Key ID was not set");
+
                 Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
-                cipher.init(Cipher.ENCRYPT_MODE, key_id.equals("3") ? Crypto.CUR_OS_ENCRYPT_KEY : Crypto.CUR_CN_ENCRYPT_KEY);
+                cipher.init(Cipher.ENCRYPT_MODE, Crypto.EncryptionKeys.get(Integer.valueOf(key_id)));
                 var regionInfo = Utils.base64Decode(event.getRegionInfo());
 
                 //Encrypt regionInfo in chunks

src/main/java/emu/grasscutter/server/packet/recv/HandlerGetPlayerTokenReq.java

@@ -114,8 +114,7 @@ public class HandlerGetPlayerTokenReq extends PacketHandler {
                     .putLong(Crypto.ENCRYPT_SEED ^ client_seed)
                     .array();
 
-                //Kind of a hack, but whatever
-                cipher.init(Cipher.ENCRYPT_MODE, req.getKeyId() == 3 ? Crypto.CUR_OS_ENCRYPT_KEY : Crypto.CUR_CN_ENCRYPT_KEY);
+                cipher.init(Cipher.ENCRYPT_MODE, Crypto.EncryptionKeys.get(req.getKeyId()));
                 var seed_encrypted = cipher.doFinal(seed_bytes);
 
                 Signature privateSignature = Signature.getInstance("SHA256withRSA");

src/main/java/emu/grasscutter/utils/Crypto.java

@@ -6,6 +6,8 @@ import java.security.PublicKey;
 import java.security.SecureRandom;
 import java.security.spec.PKCS8EncodedKeySpec;
 import java.security.spec.X509EncodedKeySpec;
+import java.util.Map;
+import java.util.HashMap;
 
 import emu.grasscutter.Grasscutter;
 
@@ -19,10 +21,10 @@ public final class Crypto {
     public static long ENCRYPT_SEED = Long.parseUnsignedLong("11468049314633205968");
     public static byte[] ENCRYPT_SEED_BUFFER = new byte[0];
 
-    public static PublicKey CUR_OS_ENCRYPT_KEY;
-    public static PublicKey CUR_CN_ENCRYPT_KEY;
     public static PrivateKey CUR_SIGNING_KEY;
 
+    public static Map<Integer, PublicKey> EncryptionKeys = new HashMap<>();
+
     public static void loadKeys() {
         DISPATCH_KEY = FileUtils.readResource("/keys/dispatchKey.bin");
         DISPATCH_SEED = FileUtils.readResource("/keys/dispatchSeed.bin");
@@ -31,15 +33,17 @@ public final class Crypto {
         ENCRYPT_SEED_BUFFER = FileUtils.readResource("/keys/secretKeyBuffer.bin");
 
         try {
-            //These should be loaded from ChannelConfig_whatever.json
             CUR_SIGNING_KEY = KeyFactory.getInstance("RSA")
                 .generatePrivate(new PKCS8EncodedKeySpec(FileUtils.readResource("/keys/SigningKey.der")));
 
-            CUR_OS_ENCRYPT_KEY = KeyFactory.getInstance("RSA")
-                .generatePublic(new X509EncodedKeySpec(FileUtils.readResource("/keys/OSCB_Pub.der")));
+            var CNRelSign = KeyFactory.getInstance("RSA")
+                .generatePublic(new X509EncodedKeySpec(FileUtils.readResource("/keys/CNRel_Pub.der")));
+
+            var OSRelSign = KeyFactory.getInstance("RSA")
+                .generatePublic(new X509EncodedKeySpec(FileUtils.readResource("/keys/OSRel_Pub.der")));
 
-            CUR_CN_ENCRYPT_KEY = KeyFactory.getInstance("RSA")
-                .generatePublic(new X509EncodedKeySpec(FileUtils.readResource("/keys/OSCN_Pub.der")));
+            EncryptionKeys.put(2, CNRelSign);
+            EncryptionKeys.put(3, OSRelSign);
         }
         catch (Exception e) {
             Grasscutter.getLogger().error("An error occurred while loading keys.", e);