Adventofcode Day 5 - Challenge 1

adventofcode-day5-1.cs

using System;
using System.Security.Cryptography;
using System.Text;

namespace ConsoleApplication
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var input = "abbhdwsy";
            var index = 0;
            var password = "";
            using (MD5 md5Hash = MD5.Create())
            {
                while(true){
                    var hash = GetMd5Hash(md5Hash, input + index);
                    if(startsWithFiveZeros(hash)){
                        password+=hash.Substring(5,1);
                    }
                    if(password.Length==8) break;
                    index++;
                }                    
            }                
            Console.WriteLine(password);
        }
        private static string GetMd5Hash(MD5 md5Hash, string input)
        {

            // Convert the input string to a byte array and compute the hash.
            byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));

            // Create a new Stringbuilder to collect the bytes
            // and create a string.
            StringBuilder sBuilder = new StringBuilder();

            // Loop through each byte of the hashed data 
            // and format each one as a hexadecimal string.
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }

            // Return the hexadecimal string.
            return sBuilder.ToString();
        }
        private static bool startsWithFiveZeros(string input){
            return input.Substring(0,5) == "00000";
        }     
    }
}