SHA512Managed is not thread safe

Test.cs

        static void Main(string[] args)
        {
            var hashAlgorithm = SHA512.Create();

            var text = "Hello world";
            var bytes = Encoding.Default.GetBytes(text);

            var hashes = new List<string>();

            Parallel.For(0, 10000, ignored =>
            {
                var hashed = hashAlgorithm.ComputeHash(bytes);
                var base64 = Convert.ToBase64String(hashed);
                hashes.Add(base64);
            });
            
            foreach (var hash in hashes)
            {
                Console.WriteLine(hash);
            }

            Console.ReadKey();
        }

No, List is not threadsafe. Use a ConcurrentBag instead....

@pbackhuvud Yes, List is not thread-safe, but ComputeHash is not thread-safe too, that's the problem, I suppose.