SHA1 & MD5

            string a = "123456";

            byte[] buffer = Encoding.UTF8.GetBytes(a);

            var sha1 = SHA1.Create();
            byte[] hash = sha1.ComputeHash(buffer);

            foreach (var b in hash)
            {
                Console.Write(b.ToString("X2"));

            }

  

            string a = "123456";

            byte[] buffer = Encoding.UTF8.GetBytes(a);

            var md5 = MD5.Create();
            byte[] hash = md5.ComputeHash(buffer);

            foreach (var b in hash)
            {
                Console.Write(b.ToString("X2"));
            }