function?[?output?]?=?DES（?datainkeyinsel?）
%DES?algorithm:?implement?the?encryption?and?decryption
%datain:?the?input?data
%keyin:??the?key?used?
%sel:?choose?the?mode??0--encryption???1---decryption
%=====方式選擇=====
%EN_DE=0：加密?????EN_DE=1：解密
EN_DE=sel;
%=====明文=====
m=datain;
%=====密鑰=====
key=keyin;
%if?length（key）<64
%????key=[key?zeros（164-length（key））];
%end
%if?length（key）>64
%????temp=key;
%????key=[];
%????key=temp（1:64）;
%end
%=====初始置換表=====
table_init=[585042342618102605244362820124...
	????????625446383022146645648403224168...
	????????574941332517?91595143352719113...
????????????615345372921135635547393123157];
%=====終止置換表=====????????
table_final=[408481656246432397471555236331...?
	?????????386461454226230375451353216129...?
	?????????364441252206028353431151195927...?
	?????????3424210501858?2633141?949175725];
%=====擴展置換表=====????????
table_expend=[32?1?2?3?4?5?4?5?6?7?8?9?8?9?1011...?
	??????????12131213141516171617181920212021...?
??????????????222324252425262728292829303132?1];??
%=====直接置換表=====??????????
table_direct=[167202129122817?1152326?5183110...?
	??????????2824143227?3?9191330?62211?425];
%=====壓縮置換1======??????????
table_redu1=[57494133251791585042342618...	?????????
	?????????10259514335271911360524436...	
	?????????635547393123157625446383022...	
	?????????1466153453729211352820124];?
%=====壓縮置換2======???????????
table_redu2=[14171124?1?5?32815?62110...
	?????????231912?426?816?7272013?2...
	?????????415231374755304051453348...
	?????????444939563453464250362932];??
%=====移位（左移次數）=====
table_LS=[1122222212222221];
%=====S盒=====?????????
box_s（::1）=[1441312151183106125907?
	??????????0157414213110612119538?
	??????????4114813621115129731050?
	??????????1512824917511314100613];
box_s（::2）=[1518146113497213120510?
	??????????3134715281412011069115?
	??????????0147111041315812693215?
	??????????1381013154211671205149];
box_s（::3）=[1009146315511312711428?
	??????????1370934610285141211151?
	??????????1364981530111212510147?
	??????????1101306987415143115212];
box_s（::4）=[7131430691012851112415?
	??????????1381156150347212110149?
	??????????1069012117131513145284?
??????????????3150610113894511127214];
box_s（::5）=[2124171011685315130149?
	??????????1411212471315015103986?
	??????????4211110137815912563014?
	??????????1181271

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????5395??2012-05-24?16:00??DES\DES.m
?????文件?????????275??2012-05-24?16:06??DES\test_DES.m
?????目錄???????????0??2012-05-24?16:07??DES\