SOExample, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Text;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine(enPwd("john", "test"));
        }
        
        public static string CreateMD5(string input, string salt = null, int iterations = 1)
        {
            // Use input string to calculate MD5 hash
            using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
            {
                byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
                if (!string.IsNullOrEmpty(salt) != null)
                {
                    inputBytes = System.Text.Encoding.ASCII.GetBytes(salt).Concat(inputBytes).ToArray();
                }
                
                byte[] hashBytes = md5.ComputeHash(inputBytes);

for (int i = 1; i < iterations; ++i)
                {
                    hashBytes = md5.ComputeHash(hashBytes);
                }

// Convert the byte array to hexadecimal string
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < hashBytes.Length; i++)
                {
                    sb.Append(hashBytes[i].ToString("X2"));
                }
                return sb.ToString();
            }
        }

public static string enPwd(string username, string pwd)
        {
            return CreateMD5(username + pwd, username, 2);
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,2 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 13 Mb, average nr of threads: 3, absolute service time: 0,33 sec