Apex Crypto AES Encrypt

    public String encryptWithManagedIV(String data) throws Exception {
        byte[] random = new byte[IV_LENGTH];
        new Random().nextBytes(random);
        return encrypt(data.getBytes(), random);
    }

    protected String encrypt(byte[] data, byte[] initialVector) throws Exception {
        Cipher c = Cipher.getInstance(AES_CIPHER);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(initialVector);
        c.init(Cipher.ENCRYPT_MODE, key, ivParameterSpec);
        byte[] encVal = c.doFinal(data);
        byte[] encValWithIv = new byte[encVal.length + IV_LENGTH];
        System.arraycopy(initialVector, 0, encValWithIv, 0, IV_LENGTH);
        System.arraycopy(encVal, 0, encValWithIv, IV_LENGTH, encVal.length);
        String encryptedValue = Base64.encodeBase64String(encValWithIv);
        return encryptedValue;
    }