Check for valid file access first

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/BungeeManager.java

@@ -106,15 +106,16 @@ public class BungeeManager {
         Path legacyFile = plugin.getPluginFolder().resolve(LEGACY_FILE_NAME);
         try {
             if (Files.notExists(proxiesFile)) {
-                if (Files.notExists(legacyFile)) {
-                    Files.createFile(proxiesFile);
-                }
-
                 if (Files.exists(legacyFile)) {
                     Files.move(legacyFile, proxiesFile);
                 }
+
+                if (Files.notExists(legacyFile)) {
+                    Files.createFile(proxiesFile);
+                }
             }
 
+            Files.deleteIfExists(legacyFile);
             try (Stream<String> lines = Files.lines(proxiesFile)) {
                 return lines.map(String::trim)
                         .map(UUID::fromString)

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocollib/EncryptionUtil.java

@@ -85,7 +85,7 @@ public class EncryptionUtil {
     /**
      * Decrypts the content and extracts the key spec.
      *
-     * @param privateKey decryption cipher initialized with the private key
+     * @param cipher     decryption cipher initialized with the private key
      * @param sharedKey  the encrypted shared key
      * @return shared secret key
      * @throws GeneralSecurityException if it fails to decrypt the data