public static byte[] StringToByteArray(String hex)
        {
            int NumberChars = hex.Length;
            byte[] bytes = new byte[NumberChars / 2];
            for (int i = 0; i < NumberChars; i += 2)
                bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
            return bytes;
        }
    private void button3_Click(object sender, EventArgs e)
        {
            string featherearring = "00804804A02A1CA20100000000000000D2F8B6FABBB700000000000000000000";
            var strarray = StringToByteArray(featherearring);

            byte[] strarray_comp = Enc.Encrypt(strarray);

            string conv = BitConverter.ToString(strarray_comp);
            MessageBox.Show(conv.Replace("-", ""));
        }



        public static byte[] BitArrayToByteArray(BitArray bits)
        {
            byte[] bytes = new byte[bits.Length / 8];
            bits.CopyTo(bytes, 0);
            return bytes;
        }
        public static byte[] Encrypt(byte[] input)
        {
            BitArray source = new BitArray(input);
            BitArray target = new BitArray(source.Length);

            target[26] = source[0];
            target[31] = source[1];
            target[17] = source[2];
            target[10] = source[3];
            target[30] = source[4];
            target[16] = source[5];
            target[24] = source[6];
            target[2] = source[7];
            target[29] = source[8];
            target[8] = source[9];
            target[20] = source[10];
            target[15] = source[11];
            target[28] = source[12];
            target[11] = source[13];
            target[13] = source[14];
            target[4] = source[15];
            target[19] = source[16];
            target[23] = source[17];
            target[0] = source[18];
            target[12] = source[19];
            target[14] = source[20];
            target[27] = source[21];
            target[6] = source[22];
            target[18] = source[23];
            target[21] = source[24];
            target[3] = source[25];
            target[9] = source[26];
            target[7] = source[27];
            target[22] = source[28];
            target[1] = source[29];
            target[25] = source[30];
            target[5] = source[31];

            return BitArrayToByteArray(target);
    }