简单的字符串加密

引入System.Web.Security命名空间

        /// <summary>
        /// encrypting string
        /// </summary>
        /// <param name="Password">encrypting string</param>
        /// <param name="Format">format,0 is SHA1,1 is MD5</param>
        /// <returns></returns>
        public static string ST_Encrypt(string Password,int Format)
        {
            string str = "";
            switch(Format)
            {
                case 0:
                    str = FormsAuthentication.HashPasswordForStoringInConfigFile(Password,"SHA1");
                    break;
                case 1:
                    str = FormsAuthentication.HashPasswordForStoringInConfigFile(Password,"MD5");
                    break;
            }
            return str;
        }
        /// <summary>
        /// decrypt string
        /// </summary>
        /// <param name="Passowrd">encrypted string</param>
        /// <returns></returns>
        public static string ST_Decrypt(string Passowrd)
        {
            string str="";
            str= FormsAuthentication.Decrypt(Passowrd).Name.ToString();
            return str;
        }