public async Task <ApplicationUser> VerifyUserAsync(RegistrationLoginModel model)
{
var user = new ApplicationUser {
Email = model.Email
};
var userInfo = await _repo.GetUserInfoAsync(u => u.Email == model.Email);
var salt = Convert.FromBase64String(userInfo.Salt);
var hashPassword = Convert.FromBase64String(userInfo.Password);
var isVerified = PasswordHashHelper.VerifyPassword(model.Password, salt, hashPassword);
return(isVerified ? userInfo : null);
}