Sample.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

public class HashGenerator
{
    public static string GenerateHash(Dictionary<string, object> data, string botToken)
    {
        // Step 1: Create data_check_string
        var sortedKeys = data.Keys.Where(k => k != "hash").OrderBy(k => k);
        StringBuilder dataCheckStringBuilder = new StringBuilder();

        foreach (var key in sortedKeys)
        {
            dataCheckStringBuilder.Append($"{key}={data[key]}\n");
        }

        string dataCheckString = dataCheckStringBuilder.ToString().TrimEnd('\n');

        // Step 2: Generate secret key using SHA256
        byte[] secretKey = SHA256.Create().ComputeHash(Encoding.UTF8.GetBytes(botToken));

        // Step 3: Compute HMAC-SHA256
        using (var hmac = new HMACSHA256(secretKey))
        {
            byte[] hashBytes = hmac.ComputeHash(Encoding.UTF8.GetBytes(dataCheckString));
            string computedHash = BitConverter.ToString(hashBytes).Replace("-", "").ToLowerInvariant();
            return computedHash;
        }
    }
}

// Example usage
class Program
{
    static void Main()
    {
        // Sample data
        var data = new Dictionary<string, object>
        {
            { "id", 837151456 },
            { "first_name", "Таёжныи ишак" },
            { "username", "UNDRCRXWN" },
            { "photo_url", "https://t.me/i/userpic/320/CFg5yjsNuLaPzr9jbyeFAonIv-EpIwWu_wq6zvuK1-Y.jpg" },
            { "auth_date", 1721555915 },
            { "hash", "<to-be-computed>" }
        };

        // Telegram Bot API Token
        string botToken = "8800712301:ABiOf-KfIAvqE139fEmcAlm3015hf3DFsC";

        // Generate hash
        string hashValue = HashGenerator.GenerateHash(data, botToken);
        Console.WriteLine("Generated Hash: " + hashValue);
    }
}