Adds a class for AES encryption which might be used instead of the current encryption methods

src/test/java/net/knarcraft/bookswithoutborders/encryption/AESTest.java

@@ -0,0 +1,23 @@
+package net.knarcraft.bookswithoutborders.encryption;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+public class AESTest {
+
+    @Test
+    public void encryptDecryptTest() {
+        String plainText = "A lot of text";
+        String password = "abc123";
+
+        AES aes = new AES(AES.generateIV(), AES.generateIV());
+
+        String encrypted = aes.encryptDecryptText(plainText, password, true);
+        assertFalse(encrypted.equals(plainText));
+        String decrypted = aes.encryptDecryptText(encrypted, password, false);
+        assertEquals(plainText, decrypted);
+    }
+
+}