CopyAndHashFile.cs

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

namespace FileCopyAndHash
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = Path.GetTempFileName();
            var data = Guid.NewGuid().ToByteArray();
            File.WriteAllBytes(input, data);

            var output = Path.GetTempFileName();

            var hash = CopyAndHash(input, output, d => Console.WriteLine($"Progress: {d}%"), () => false);

            Console.WriteLine("Content: " + Convert.ToBase64String(data));

            if (data.SequenceEqual(File.ReadAllBytes(output)))
                Console.Out.WriteLine("File is equal!");
            else
                Console.Out.WriteLine("File is NOT equal!");

            Console.WriteLine("Hash: " + Convert.ToBase64String(hash));

            if (SHA512.Create().ComputeHash(File.ReadAllBytes(output)).SequenceEqual(hash))
                Console.Out.WriteLine("hash is equal!");
            else
                Console.Out.WriteLine("hash is NOT equal!");

            Console.ReadKey();
        }

        private static byte[] CopyAndHash(string source, string target, Action<double> progress, Func<bool> isCanceled)
        {
            var sha512 = SHA512.Create();

            using (var targetStream = File.OpenWrite(target))
            using (var cryptoStream = new CryptoStream(targetStream, sha512, CryptoStreamMode.Write))
            using (var sourceStream = File.OpenRead(source))
            {
                byte[] buffer = new byte[81920];
                int read;
                while ((read = sourceStream.Read(buffer, 0, buffer.Length)) > 0 && !isCanceled())
                {
                    cryptoStream.Write(buffer, 0, read);

                    progress?.Invoke((double) sourceStream.Length / sourceStream.Position * 100);
                }
            }

            File.SetAttributes(target, File.GetAttributes(source));

            var hash = sha512.Hash;
            sha512.Dispose();
            return hash;
        }
    }
}