public static boolean equals(byte[] a, byte[] b) {
        if (a == null && b == null)
            return true;

        if (a == null || b == null)
            return false;

        if (a.length != b.length)
            return false;

        for (int i = 0; i < a.length; i++) {
            if (a[i] != b[i]) {
                return false;
            }
        }
        return true;
    }