using System;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        long contractId = 11607410420840;

        long count = 128;

        long from = 0;

        long hash = HashFromLong(contractId);

        var bucketId = ModuloBucketOfLongHash(hash, count, from);

        Console.WriteLine(bucketId);

    }

      public static long HashFromLong(long input)

    {

        Span<byte> buf = stackalloc byte[sizeof(long)];

        bool written = BitConverter.TryWriteBytes(buf, input);

​

        Span<byte> result = stackalloc byte[SHA256.HashSizeInBytes];

        bool hashed = SHA256.TryHashData(source: buf, destination: result, out _);

​

        return BitConverter.ToInt64(result);

    }

​

​

    public static long ModuloBucketOfLongHash(long hash, long сount, long fromId)

    {

        long result = hash % сount + fromId;

​

        return result < 0

            ? result + сount

            : result;

    }

​

}