/// <summary>

/// 获取MAC校验字节数据

/// </summary>

/// <param name="bankData">报文字节</param>

/// <returns>MAC校验字节数据</returns>

internal static byte[] GetMacData(byte[] bankData)

{

    var lstMacKey = new List<byte>(_macKey);

    var leftKey = lstMacKey.GetRange(, ).ToArray();

    var rightKey = lstMacKey.GetRange(, ).ToArray();

    var lstPlaintext = new List<byte>(bankData);

    while (lstPlaintext.Count %  != )

        lstPlaintext.Add();

    long intMacData = ;

    for (var i = ; i < lstPlaintext.Count / ; i++)

    {

        if (i == )

            intMacData = BitConverter.ToInt64(lstPlaintext.GetRange(i * , ).ToArray(), );

        else

            intMacData = intMacData ^ BitConverter.ToInt64(lstPlaintext.GetRange(i * , ).ToArray(), );

        intMacData = BitConverter.ToInt64(Encrypt(BitConverter.GetBytes(intMacData), GetKey(leftKey)), );

    }

    var bysRet = Decrypt(BitConverter.GetBytes(intMacData), GetKey(rightKey));

    bysRet = Encrypt(bysRet, GetKey(leftKey));

    return Encoding.ASCII.GetBytes(BytesToHex(bysRet).ToUpper().Substring(,));

}