Fix the issue for #2025

Author: gefeili

core/src/main/java/org/bouncycastle/crypto/engines/RomulusEngine.java

@@ -855,7 +855,7 @@ static void hirose_128_128_256(byte[] h, byte[] g, byte[] m, int mOff)
     }
 
     @Override
-    public void init(byte[] key, byte[] iv)
+    protected void init(byte[] key, byte[] iv)
         throws IllegalArgumentException
     {
         npub = iv;

core/src/main/java/org/bouncycastle/crypto/engines/XoodyakEngine.java

@@ -43,7 +43,7 @@ public XoodyakEngine()
     }
 
     @Override
-    public void init(byte[] key, byte[] iv)
+    protected void init(byte[] key, byte[] iv)
         throws IllegalArgumentException
     {
         K = key;