public IActionResult Post([FromBody] RegisterRequest value) { var sel = (from user in context.Passwords where user.Username.ToUpper() == value.Username.ToUpper() select user).ToList(); if (sel.Count != 0) { return(BadRequest(new { error = "Account with given login already exists" })); } var salt = new byte[4]; using (var rng = RandomNumberGenerator.Create()) { rng.GetBytes(salt); } var passHash = hasher.ComputeHash(value.Password, salt); context.AddAccount(value.Username, passHash.Value, salt); return(Ok(new { answer = "Account created" })); }