using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

        while (true)

        {

            Console.WriteLine("Enter the plain text password : \n");

            string plainTextPassword = Console.ReadLine();

            string Sha512Hash = GetSHA512Hash(plainTextPassword);

            string Sha512HashAsHex = GetSHA512HashAsHex(plainTextPassword);

            Console.WriteLine("SHA512 hash bytes encoded as string " + Sha512Hash);

            Console.WriteLine("SHA512 hash bytes encoded as Hex " + Sha512HashAsHex);

            Console.WriteLine("SHA512 hash bytes back to original " + GetSHA512HashAsOriginal(Sha512Hash));

        }

    }

    static string GetSHA512Hash(string message)

    {

        using (var sha512 = SHA512.Create())

        {

            byte[] hashedBytes = sha512.ComputeHash(Encoding.UTF8.GetBytes(message));

            return Encoding.UTF8.GetString(hashedBytes);

        }

    }

​

    static string GetSHA512HashAsHex(string message)

    {

        using (var sha512 = SHA512.Create())

        {

            byte[] hashedBytes = sha512.ComputeHash(Encoding.UTF8.GetBytes(message));

            return BitConverter.ToString(hashedBytes).Replace("-", "");

        }

    }

    static string GetSHA512HashAsOriginal(string message)

    {

        byte[] hashAsBytes = Encoding.UTF8.GetBytes(message);

        return BitConverter.ToString(hashAsBytes).Replace("-", "");

    }

}