C#中的checksum计算公式

private Byte GetCheckSum(Byte[] bytes)
{
	Byte checksum = 0x00;
 
	foreach (byte bt in bytes)
	{
		checksum ^= bt;
	}
 
	return checksum;
}

private static string CheckSum(string message)
{
    char[] chars = message.ToCharArray();
    int checksum = 0;
    for (int i = 0; i < chars.Length; i++)
    {
        checksum += (int)chars[i];
    }
    checksum = (~checksum & 0xFFFF) + 0x0001;
    return Convert.ToString(checksum, 16).ToUpper();
}