MD5 带salt 加密

根据输入的password而生成salt和pwdHash

        /// <summary>
        /// 根据pwd分别生成Salt和Pwd的值（新增插入时使用）
        /// </summary>
        /// <param name="pwd">明文的密码</param>
        /// <param name="salt">密文后的salt</param>
        /// <param name="pwdhash">密文后的pwd</param>
        public static void GetPwdhashAndSalt(string pwd, out string salt, out string pwdHash)
        {
            Rfc2898DeriveBytes db = new Rfc2898DeriveBytes(pwd, 32, 1000);
            salt = Convert.ToBase64String(db.Salt);
            pwdHash = Convert.ToBase64String(db.GetBytes(32));
        }

根据salt和pwdHash来判断密码的正确性

// <summary>
        /// 根据salt和pwdHash来判断密码的正确性（验证时使用）
        /// </summary>
        /// <param name="pwd">明文的密码</param>
        /// <param name="salt">密文的salt</param>
        /// <returns>密文的salt</returns>
        public static string GetPwdhash(string pwd, string salt)
        {
            string pwdHash = "";
            System.Security.Cryptography.Rfc2898DeriveBytes db;
            db = new System.Security.Cryptography.Rfc2898DeriveBytes(pwd, System.Convert.FromBase64String(salt), 1000);
            return pwdHash = System.Convert.ToBase64String(db.GetBytes(32));
        }