MATLAB 数据加密标准DES算法
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function C=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--------------------------------%以字符串形式输入的明文和密钥转换成01数字串MB=[];for i=1:16 Mi=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;KB=[];for i=1:16 Ki=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; 16,17,18,19,20,21; 20,21,22,23,24,25; 24,25,26,27,28,29; 28,29,30,31,32,1];S1=[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, 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, 11, 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, 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, 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, 5, 6, 11, 0, 14, 9, 2; 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8; 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11];P=[16,7,20,21,29,12,28,17,1,15,23,26,5,18,31,10,2,8,24,14,32,27,3,9,19,13,30,6,22,11,4,25];PC1=[57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,35,27,19,11,3,60,52,44,36,63,55,47,39,31,23,15,7,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,28,20,12,4];PC2=[14,17,11,24,1,5,3,28,15,6,21,10,23,19,12,4,26,8,16,7,27,20,13,2,41,52,31,37,47,55,30,40,51,45,33,48,44,49,39,56,34,53,46,42,50,36,29,32];%% -----------------第二步:产生子密钥------------------------------Ki=zeros(16,48);K_PC1=K(PC1);%经过密钥初始置换C0=K_PC1(1:28);D0=K_PC1(29:56);for i=1:16 if i==1||i==2||i==9||i==16%第1、2、9、16轮循环左移1位 C0=[C0(2:end),C0(1)]; D0=[D0(2:end),D0(1)]; else%其它轮循环左移2位 C0=[C0(3:end),C0(1:2)]; D0=[D0(3:end),D0(1:2)]; end K_LS=[C0,D0]; Ki(i,:)=K_LS(PC2);end%% -----------------第三步:16轮循环加密----------------------------L=M(1:32);%输入的左半部分明文R=M(33:64);%输入的右半部分明文%以下是16轮迭代for i=1:16 E0=reshape(E',1,48);%把E盒转换成行向量 R_E=R(E0);%E盒扩展 R_Ki=mod(R_E+Ki(i,:),2);%与子密钥相加 %经过S1盒 B=R_Ki(1:6); x=B(1)*2+B(6)+1; y=B(2)*8+B(3)*4+B(4)*2+B(5)+1; C=['0000',dec2bin(S1(x,y))]; C=C(end-3:end); C1=[str2num(C(1)),str2num(C(2)),str2num(C(3)),str2num(C(4))]; %经过S2盒 B=R_Ki(7:12); x=B(1)*2+B(6)+1; y=B(2)*8+B(3)*4+B(4)*2+B(5)+1; C=['0000',dec2bin(S2(x,y))]; C=C(end-3:end); C2=[str2num(C(1)),str2num(C(2)),str2num(C(3)),str2num(C(4))]; %经过S3盒 B=R_Ki(13:18); x=B(1)*2+B(6)+1; y=B(2)*8+B(3)*4+B(4)*2+B(5)+1; C=['0000',dec2bin(S3(x,y))]; C=C(end-3:end); C3=[str2num(C(1)),str2num(C(2)),str2num(C(3)),str2num(C(4))]; %经过S4盒 B=R_Ki(19:24); x=B(1)*2+B(6)+1; y=B(2)*8+B(3)*4+B(4)*2+B(5)+1; C=['0000',dec2bin(S4(x,y))]; C=C(end-3:end); C4=[str2num(C(1)),str2num(C(2)),str2num(C(3)),str2num(C(4))]; %经过S5盒 B=R_Ki(25:30); x=B(1)*2+B(6)+1; y=B(2)*8+B(3)*4+B(4)*2+B(5)+1; C=['0000',dec2bin(S5(x,y))]; C=C(end-3:end); C5=[str2num(C(1)),str2num(C(2)),str2num(C(3)),str2num(C(4))]; %经过S6盒 B=R_Ki(31:36); x=B(1)*2+B(6)+1; y=B(2)*8+B(3)*4+B(4)*2+B(5)+1; C=['0000',dec2bin(S6(x,y))]; C=C(end-3:end); C6=[str2num(C(1)),str2num(C(2)),str2num(C(3)),str2num(C(4))]; %经过S7盒 B=R_Ki(37:42); x=B(1)*2+B(6)+1; y=B(2)*8+B(3)*4+B(4)*2+B(5)+1; C=['0000',dec2bin(S7(x,y))]; C=C(end-3:end); C7=[str2num(C(1)),str2num(C(2)),str2num(C(3)),str2num(C(4))]; %经过S8盒 B=R_Ki(43:48); x=B(1)*2+B(6)+1; y=B(2)*8+B(3)*4+B(4)*2+B(5)+1; C=['0000',dec2bin(S8(x,y))]; C=C(end-3:end); C8=[str2num(C(1)),str2num(C(2)),str2num(C(3)),str2num(C(4))]; C=[C1,C2,C3,C4,C5,C6,C7,C8];%经过8个S盒的结果合并起来 R_P=C(P);%经过P盒置换 %交换左右两半部分 TEMP=L; L=R; R=mod(TEMP+R_P,2);end%交换左右两半部分TEMP=L;L=R;R=TEMP;%输出密文C=[L,R];CS=[];C=num2str(C);pos=find(C~=' ');C=C(pos);for i=1:4:61 Ci=C(i:i+3); CS=[CS,num2str(dec2hex(bin2dec(Ci)))];endC=CS;
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