diff --git a/src/main/java/libKonogonka/xtsaes/XTSAESCipher.java b/src/main/java/libKonogonka/xtsaes/XTSAESCipher.java
index be62679..13aee66 100644
--- a/src/main/java/libKonogonka/xtsaes/XTSAESCipher.java
+++ b/src/main/java/libKonogonka/xtsaes/XTSAESCipher.java
@@ -34,10 +34,8 @@ import java.util.function.LongFunction;
  * XTS-AES cipher with arbitrary (non 128-bit aligned) data unit lengths.
  *
  * @author Ahseya
- */
-
-/**
-* Updated for special usage by Dmitry Isaenko.
+ *
+ * Class updated for NCAs usage.
 * */
 @NotThreadSafe
 public class XTSAESCipher {
diff --git a/src/main/java/libKonogonka/xtsaes/XTSCore.java b/src/main/java/libKonogonka/xtsaes/XTSCore.java
index cc409e7..29342c9 100644
--- a/src/main/java/libKonogonka/xtsaes/XTSCore.java
+++ b/src/main/java/libKonogonka/xtsaes/XTSCore.java
@@ -26,7 +26,7 @@ package libKonogonka.xtsaes;
 import net.jcip.annotations.NotThreadSafe;
 import org.bouncycastle.crypto.BlockCipher;
 import org.bouncycastle.crypto.DataLengthException;
-import org.bouncycastle.crypto.engines.AESFastEngine;
+import org.bouncycastle.crypto.engines.AESEngine;
 import org.bouncycastle.crypto.params.KeyParameter;
 
 import java.util.Arrays;
@@ -36,10 +36,8 @@ import java.util.Objects;
  * XTS core functions.
  *
  * @author Ahseya
- */
-
-/**
- * Updated for special usage by Dmitry Isaenko.
+ *
+ * Class updated for NCAs usage.
  * */
 @NotThreadSafe
 class XTSCore {
@@ -56,7 +54,7 @@ class XTSCore {
     }
 
     XTSCore(XTSTweak tweak) {
-        this(new AESFastEngine(), tweak);
+        this(new AESEngine(), tweak);
     }
 
     XTSCore(boolean isDefault) {
@@ -64,7 +62,7 @@ class XTSCore {
     }
 
     XTSCore init(boolean forEncryption, KeyParameter key) throws IllegalArgumentException {
-        byte[] k = ((KeyParameter) key).getKey();
+        byte[] k = key.getKey();
         if (k.length != 32 && k.length != 64) {
             throw new IllegalArgumentException("bad key length: " + k.length);
         }
diff --git a/src/main/java/libKonogonka/xtsaes/XTSTweak.java b/src/main/java/libKonogonka/xtsaes/XTSTweak.java
index cd2c2af..1ff0ee7 100644
--- a/src/main/java/libKonogonka/xtsaes/XTSTweak.java
+++ b/src/main/java/libKonogonka/xtsaes/XTSTweak.java
@@ -26,7 +26,7 @@ package libKonogonka.xtsaes;
 import net.jcip.annotations.NotThreadSafe;
 import org.bouncycastle.crypto.BlockCipher;
 import org.bouncycastle.crypto.DataLengthException;
-import org.bouncycastle.crypto.engines.AESFastEngine;
+import org.bouncycastle.crypto.engines.AESEngine;
 import org.bouncycastle.crypto.params.KeyParameter;
 import org.bouncycastle.util.Pack;
 
@@ -38,29 +38,11 @@ import java.util.function.LongFunction;
  * XTS tweak with pluggable tweak function.
  *
  * @author Ahseya
- */
-
-/**
- * Updated for special usage by Dmitry Isaenko.
+ *
+ * Class updated for NCAs usage.
  * */
 @NotThreadSafe
 class XTSTweak {
-    static byte[] nintTweakFunction(long tweakValue) {
-        byte[] bs = new byte[BLOCK_SIZE];
-        byte[] twk = Pack.longToBigEndian(tweakValue);
-        int j = BLOCK_SIZE - twk.length;
-        for (byte b: twk){
-            bs[j++] = b;
-        }
-        return bs;
-    }
-
-    static byte[] defaultTweakFunction(long tweakValue) {
-        byte[] bs = Pack.longToLittleEndian(tweakValue);
-        bs = Arrays.copyOfRange(bs, 0, BLOCK_SIZE);
-        return bs;
-    }
-
     private static final long FDBK = 0x87;
     private static final long MSB = 0x8000000000000000L;
     private static final int BLOCK_SIZE = 16;
@@ -84,7 +66,7 @@ class XTSTweak {
     }
 
     XTSTweak(LongFunction<byte[]> tweakFunction) {
-        this(new AESFastEngine(), tweakFunction);
+        this(new AESEngine(), tweakFunction);
     }
 
     XTSTweak(boolean isDefault) {
@@ -92,6 +74,20 @@ class XTSTweak {
                 ? XTSTweak::defaultTweakFunction
                 : XTSTweak::nintTweakFunction);
     }
+    static byte[] defaultTweakFunction(long tweakValue) {
+        byte[] bs = Pack.longToLittleEndian(tweakValue);
+        bs = Arrays.copyOfRange(bs, 0, BLOCK_SIZE);
+        return bs;
+    }
+    static byte[] nintTweakFunction(long tweakValue) {
+        byte[] bs = new byte[BLOCK_SIZE];
+        byte[] twk = Pack.longToBigEndian(tweakValue);
+        int j = BLOCK_SIZE - twk.length;
+        for (byte b: twk){
+            bs[j++] = b;
+        }
+        return bs;
+    }
 
     XTSTweak init(KeyParameter key) throws IllegalArgumentException {
         cipher.init(true, key);