using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
    class Program
    {

        static void Main(string[] args)
        {
            DSACryptoServiceProvider myDSA = new DSACryptoServiceProvider(1024);
            byte[] signature1;
            byte[] signature2;
            Console.WriteLine("-------- I. --------");


            Console.WriteLine("Cale Fiser: ");
            string caleFiser = Console.ReadLine();
            signature1 = myDSA.SignData(System.Text.Encoding.ASCII.GetBytes(caleFiser));
            bool verified;
            verified = myDSA.VerifyData(System.Text.Encoding.ASCII.GetBytes(caleFiser),  signature1);
            Console.WriteLine(Encoding.Default.GetString(signature1));
            if (verified)
            {
                    StreamWriter scrie = new StreamWriter("sig.txt");
                    scrie.WriteLine(Encoding.ASCII.GetString(signature1));
                    scrie.Close();
            }
            Console.WriteLine("-------- II. --------");
            Console.WriteLine("Cale Fiser: ");
             caleFiser = Console.ReadLine();
            StreamReader read = new StreamReader("sig.txt");
            signature1 = myDSA.SignData(System.Text.Encoding.ASCII.GetBytes(caleFiser));
            char[] sir = read.ReadToEnd().ToCharArray();
            signature2 = myDSA.SignData(Encoding.ASCII.GetBytes(sir, 0, sir.Length));
            read.Close();//afisam semnatura pe ecran transformand variabila sig din byte in string pt a putea vedea pe consola semnatura
            int n1, n2;
            n1 = signature1.Length;
            n2 = signature2.Length;
            Console.WriteLine(n1);
            Console.WriteLine(n2);
            bool itSame = true;

                for (int i = 0; i < n1; i++)
                    if (signature1[i].CompareTo(signature2[i + 1]) == 0)
                    {
                        itSame = false;
                        Console.WriteLine( "Semnaturi diferite ");
                        break;
                    }
                if (itSame)
                {
                Console.WriteLine( "Semnaturi identice");
                }


            Console.WriteLine("-------- III. --------");
            System.Diagnostics.Stopwatch swatch = new System.Diagnostics.Stopwatch();
            SHA256Managed myHash = new SHA256Managed();
            int count = 100;
            byte[] signature;
            swatch.Reset();
            swatch.Start();
            for (int i = 0; i < count; i++)
            {
                signature = myDSA.SignData(signature1);
            }
            swatch.Stop();

            Console.WriteLine("Timpul semnarii: " + ((double)swatch.ElapsedMilliseconds / count) + " ms");

            Console.Read();  //scriem asta pt a mentine consola pe ecran, in caz contrar nu ramane pe ecran
        }
    }
}