using System;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        string password = "abc";

        int passwordSaltKeySize = 5;

        var saltKey = CreateSaltKey(passwordSaltKeySize);

        string hashedPassword = CreatePasswordHash(password, saltKey);

        Console.WriteLine(saltKey);

        Console.WriteLine(hashedPassword);

    }

    private static string CreateSaltKey(int size)

    {

        //generate a cryptographic random number

        using var provider = new RNGCryptoServiceProvider();

        var buff = new byte[size];

        provider.GetBytes(buff);

​

        // Return a Base64 string representation of the random number

        return Convert.ToBase64String(buff);

    }

    private static string CreatePasswordHash(string password, string saltKey)

    {

        int trimByteCount = 0;

        byte[] data = Encoding.UTF8.GetBytes(string.Concat(password, saltKey));

        var algorithm = (HashAlgorithm)CryptoConfig.CreateFromName("SHA512");

        if (algorithm == null)

            throw new ArgumentException("Unrecognized hash name");

​

        if (trimByteCount > 0 && data.Length > trimByteCount)

        {

            var newData = new byte[trimByteCount];

            Array.Copy(data, newData, trimByteCount);

​

            return BitConverter.ToString(algorithm.ComputeHash(newData)).Replace("-", string.Empty);

        }

​

        return BitConverter.ToString(algorithm.ComputeHash(data)).Replace("-", string.Empty);

    }

}