Fix encryption disabling & some refactoring

src/main/java/net/limework/data/Encryption.java

@@ -0,0 +1,37 @@
+package net.limework.data;
+
+import org.bukkit.configuration.Configuration;
+import org.cryptomator.siv.SivMode;
+import org.cryptomator.siv.UnauthenticCiphertextException;
+
+import javax.crypto.IllegalBlockSizeException;
+import java.nio.charset.StandardCharsets;
+
+public class Encryption {
+
+    private boolean encryptionEnabled;
+    private String encryptionKey;
+    private String macKey;
+    private final SivMode AES_SIV = new SivMode();
+
+    public Encryption(Configuration config){
+        encryptionEnabled = config.getBoolean("Redis.EncryptMessages");
+        if (encryptionEnabled) {
+            // AES-128 encryption
+            encryptionKey = config.getString("Redis.EncryptionKey");
+            macKey = config.getString("Redis.MacKey");
+        }
+    }
+
+    public boolean isEncryptionEnabled() { return encryptionEnabled; }
+
+    public String decrypt(byte[] message) throws UnauthenticCiphertextException, IllegalBlockSizeException {
+        return new String(AES_SIV.decrypt(encryptionKey.getBytes(), macKey.getBytes(), message), StandardCharsets.UTF_8);
+    }
+
+    public byte[] encrypt(String message) {
+        return AES_SIV.encrypt(encryptionKey.getBytes(), macKey.getBytes(), message.getBytes());
+    }
+
+
+}