DES算法matlab代码

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1、%functionC=DES(M,K)%%---------------------------------------------------------------%数据加密标准DES算法的Matlab实现%输入明文M和密钥K用16进制数表示，字符串格式%--------------------------------------------------------------------------%%---------------第一步：数据初始化--------------------

2、------------%以字符串形式输入的明文转换成01数字串M='123456ABCD132536';MB=[];fori=1:16Mi=M(i);MBi=['0000',dec2bin(hex2dec(Mi))];MBi=MBi(end-3:end);MBi=[str2num(MBi(1)),str2num(MBi(2)),str2num(MBi(3)),str2num(MBi(4))];MB=[MB,MBi];endM=MB;%以字符串形式将输入的密钥转化成01数字串KB=[];K='A

3、ABB09182736CCDD';fori=1:16Ki=K(i);KBi=['0000',dec2bin(hex2dec(Ki))];KBi=KBi(end-3:end);KBi=[str2num(KBi(1)),str2num(KBi(2)),str2num(KBi(3)),str2num(KBi(4))];KB=[KB,KBi];endK=KB;E=[32,1,2,3,4,5;4,5,6,7,8,9;8,9,10,11,12,13;12,13,14,15,16,17;16,17,18,19

4、,20,21;20,21,22,23,24,25;24,25,26,27,28,29;28,29,30,31,32,1];%将32比特变成48比特的扩展换位表，如课本表6-2S1=[14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7;0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8;4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0;15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13];S2=[15

5、,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10;3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5;0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15;13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9];S3=[10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8;13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1;13,6,4,9,8,15,3,0,1

6、1,1,2,12,5,10,14,7;1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12];S4=[7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15;13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9;10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4;3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14];S5=[2,12,4,1,7,10,11,6,8,5,3,15,13,

7、0,14,9;14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6;4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14;11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3];S6=[12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11;10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8;9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6;4,3,2,12,9

8、,5,15,10,11,14,1,7,6,0,8,13];S7=[4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1;13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6;1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2;6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12];S8=[13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7;1,15,13,8,10,3,7,4,12,