C# 生成字符串的 CheckSum

C# 生成字符串的 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();
}

例如，字符串“1234567890” 的 CheckSum 為：“FDF3”