encryptAES with iv parameter

HogeCipher.java

public class HogeCipher {
    private static final String keyString = "<your secret key>"

    public static String encryptString(String ivString, String input)
            throws
            java.io.UnsupportedEncodingException,
            NoSuchAlgorithmException,
            NoSuchPaddingException,
            InvalidKeyException,
            InvalidAlgorithmParameterException,
            IllegalBlockSizeException,
            BadPaddingException {
        byte[] ivBytes;
        ivBytes = new byte[]{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
        if (ivString !=null)
            ivBytes = ivString.getBytes("UTF-8");
            
        byte[] keyBytes = keyString.getBytes("UTF-8");

        return Base64.encodeToString(encryptAES(ivBytes, keyBytes, input.getBytes("UTF-8")), Base64.DEFAULT);
    }

    private static byte[] encryptAES(byte[] iv, byte[] key, byte[] enc)
            throws
            NoSuchAlgorithmException,
            NoSuchPaddingException,
            InvalidKeyException,
            InvalidAlgorithmParameterException,
            IllegalBlockSizeException,
            BadPaddingException{
        AlgorithmParameterSpec ivSpec = new IvParameterSpec(iv);
        SecretKeySpec newKey = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, newKey, ivSpec);

        return cipher.doFinal(enc);
    }

    private static byte[] decryptAES(byte[] iv, byte[] key, byte[] dec)
            throws
            NoSuchAlgorithmException,
            NoSuchPaddingException,
            InvalidKeyException,
            InvalidAlgorithmParameterException,
            IllegalBlockSizeException,
            BadPaddingException{
        AlgorithmParameterSpec ivSpec = new IvParameterSpec(iv);
        SecretKeySpec newKey = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, newKey);

        return cipher.doFinal(dec);
    }
}