using System;

​

public class Program

{

    private static byte GetCheckSum(byte[] buff, int len)

    {

        var sum = 0;

        for (var i = 0; i < len; i++)

        {

            sum += (sbyte)buff[i];

        }

​

        var val = (byte)(0 - sum);

        return val;

    }

​

    public static void Main()

    {

        // 2023-11-02 02:16:56.7331|DEBUG|TransportsCommon.DumpLogger|FULL MESSAGE 7E 01 00 E9 00 81 20 62 00 00 00 00 00 00 02 00 00 00 58 F2 7F 61 50 4B 03 04 14 00 00 00 08 00 00 00 21 50 83 F4 3B 7B D4 2F 00 00 3D C4 00 00 18 00 00 00 47 65 6E 65 72 69 63 43 6C 69 44 65 73 63 72 69 70 74 6F 72 2E 78 6D 6C E5 7D 6B 73 DB B8 96 E0 F7 A9 9A FF 80 ED AA AD 38 B5 76 22 C9 AF 24 7B BD 55 B6 FC 52 B5 65 6B 2C 25 B9 B7 52 29 17 4D 41 12 27 12 C9 21 29 3F 7A 67 FE FB 9E 07 00 02 14 48 C9 4E 6E EF DD BB FD A1 63 01 20 70 00 1C 1C 9C 37 FE D2 4D 16 8B 20 1E 5F 45 79 F1 BF FE F5 5F 84 F8 8B 2A 10 D1 F8 E8 B7 D6 6F 22 5C C0 BF 17 B2 F8 22 B3 3C 4A E2 DF C4 4C CE 53 2A 11 DD AB 9E 78 D0 C5 51 9C 2E 8B A3 DF 7E 13 C9 B2 A0 BF BE 7D 7B A3 BE 79 B3 2D DE 5C BD F9 FE FD B7 F7 AB 23 00

        var bytes = Convert.FromHexString("7E0100E9008120620000000000000200000058F27F61504B03041400000008000000215083F43B7BD42F00003DC400001800000047656E65726963436C6944657363726970746F722E786D6CE57D6B73DBB896E0F7A99AFF80EDAAAD38B57622C9AF247BBD55B6FC52B5656B2C25B9B75229174D41122712C921293F7A67FEFB9E0700021448C94E6EEFDDBBFDA163012070001C1C9C37FED24D168B201E5F4579F1BFFEF55F84F88B2A10D1F8E8B7D66F225CC0BF17B2F822B33C4AE2DFC44CCE532A11DDAB9E78D0C5519C2E8BA3DF7E13C9B2A0BFBE7D7BA3BE79B32DDE5CBDF9FEFDB7F7AB2300");

        var cs = GetCheckSum(bytes, bytes.Length);

        var result = 0x11 == cs ? "Good" : "Bad";

        Console.WriteLine(result);

    }

}