#region 撒盐加密

            string salt = Guid.NewGuid().ToString();

            byte[] passwordAndSaltBytes = System.Text.Encoding.UTF8.GetBytes(model.Password + salt);

            byte[] hashBytes = new System.Security.Cryptography.SHA256Managed().ComputeHash(passwordAndSaltBytes);

            string hashString = Convert.ToBase64String(hashBytes);

            model.Password = hashString;

            model.Salt = salt;

            #endregion

            #region 撒盐解密，用户存在的情况下

            string _salt = model.Salt;

            string password = "123456";//用户输入的数据，获取过来

            byte[] _passwordAndSaltBytes = System.Text.Encoding.UTF8.GetBytes(password + salt);

            byte[] _hashBytes = new System.Security.Cryptography.SHA256Managed().ComputeHash(_passwordAndSaltBytes);

            string _hashString = Convert.ToBase64String(_hashBytes);

            if (_hashString==model.Password)

            {

                return Json(new

                {

                    error=0,

                    msg="验证成功"

                });

            }

            #endregion