using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

        var saltedPassword = GenerateSaltedHashSHA256(UnicodeEncoding.Unicode.GetBytes("Password1!"), Convert.FromBase64String("gJBn9B+GmsPHTYgaP/PzhQ=="));

        Console.WriteLine(Convert.ToBase64String(saltedPassword));

    }

    private static byte[] GenerateSaltedHashSHA256(byte[] plainText, byte[] salt, DateTime? passwordDate = null)

{

    HashAlgorithm algorithm = new SHA256Managed();

​

    byte[] plainTextWithSaltBytes =

        new byte[plainText.Length + salt.Length];

​

    for (int i = 0; i < plainText.Length; i++)

    {

        plainTextWithSaltBytes[i] = plainText[i];

    }

​

    for (int i = 0; i < salt.Length; i++)

    {

        plainTextWithSaltBytes[plainText.Length + i] = salt[i];

    }

​

    if (passwordDate != null)

    {

        TimeSpan span = passwordDate.Value.Subtract(new DateTime(2006, 5, 27));

        int count = (span.Days / 30) + (span.Days % 30) * 40 + 1;

        while (count > 0)

        {

            plainTextWithSaltBytes = algorithm.ComputeHash(plainTextWithSaltBytes);

            count--;

        }

​

        return plainTextWithSaltBytes;

    }

    else

    {

        return algorithm.ComputeHash(plainTextWithSaltBytes);

    }

}

}