C语言实现DES加密解密算法(1).docx

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1、C语言实现DES加密解密算法#include<stdio.h>int asciim8,m_1616,m64,asciik8,k_1616,k64,m_ip64,l32,r32,k_pc156,c28,d28,cd56,k_pc248,re48,sh32,tempr32,m064,m0064,res8;int type;int ip64=58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33,25,17,9,1,59,51,43,35,2

2、7,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7;int ip_164=40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25;int pc_156=57,49,41,33,25,17,9,1,58,50,42,34,26,18

3、,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;int pc_248=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;int exe48=32,1,2,3,4,5,4,5,6,7,8

4、,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;int p32=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;int s8416=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

5、,6,2,11,15,12,9,7,3,10,5,0,15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13,15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9,10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,13,6,4,

6、9,8,15,3,0,11,1,2,12,5,10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12,7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14,2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,4,2

7、,1,11,10,13,7,8,15,9,12,5,6,3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13,4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6

8、,1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12,13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11;int print(int *jg,int a,int b)/ 输出函数，第一个参数是要输出的数组，第二个参数数组的长度，第三个参数是每行数的

9、个数int i;for(i=0;i<a;i+)if(i%b=0)printf(n);printf(%d,jgi);return 1;int ascii_to_erjinzhi(int *ascii,int *jg)/这是将8位的ascii矩阵转换成为64位二进制的jg矩阵int i,j,tempb;for(i=0,j=7;i<8;i+)tempb=(int) asciii;while(tempb>1)jgj=(int) (tempb%2);tempb=(int) (tempb/2);j-;switch(tempb)case 0:jgj=0;break;case 1:jgj=1;br

10、eak;while(j%8!=0)j-;jgj=0;j=(i+1)*8+7;return 1;int input_16(int *ja,int *jb,int *jc)/以16进制的形式输入，ja是16进制的矩阵，jb是16进制矩阵转换成8位的十进制矩阵，/jc是再将它转换成64位的二进制矩阵int i,j;for(i=0;i<16;i+)jai=getchar;if(jai= |jai=n)i-;for(i=0;i<16;i+)if(i%2=0&i!=0)printf(H );printf(%c,jai);for(i=0;i<16;i+)if(jai<=9)jai=jai-4

11、8;else if(jai>=A&jai<=F)jai=jai-55;elsejai=jai-87;for(i=0,j=0;i<8;i+,j=j+2)jbi=jaj*16+jaj+1;ascii_to_erjinzhi(jb,jc);/printf(n二进制表示是:);/print(jc,64,8);return 1;int shuziinput(int *ja,int *jb)/以ascii码的数字的形式输入int i;for(i=0;i<8;i+)scanf(%d,&jai);ascii_to_erjinzhi(ja,jb);return 1;int zifuinput(i

12、nt *ja,int *jb)/以ascii码的字符形式输入int i;for(i=0;i<8;i+) jai=getchar;if(jai= |jai=n)/如果没有换行符在密钥输入的时候密钥初始值就是10/如果写的是换行时break是那么密钥不能输入，直接出结果。如果先调用密钥输入明文直接出结果i-;elsecontinue;for(i=0;i<8;i+)printf(%d ,jai);ascii_to_erjinzhi(ja,jb);/printf(n二进制表示是:);/print(jb,64,8);getchar;return 1;int input(int signal)/输

13、入明文或者密文函数printf(请选择输入方式 (ASCII码字符形式输入1，ASCII码数字形式输入2，十六进制形式输入3);scanf(%d,&type);if(signal=1)printf(请输入明文:n);else if(signal=2)printf(请输入密文:n);if(type=1)zifuinput(asciim,m);else if(type=2)shuziinput(asciim,m);/printf(chenggong);elseinput_16(m_16,asciim,m);return 1;int miyaoinput/密钥的输入printf(n请输入密钥:n);

14、if(type=1)zifuinput(asciik,k);else if(type=2)shuziinput(asciik,k);elseinput_16(k_16,asciik,k);return 1;int ipzhihuan/IP置换int i,j;for(i=0;i<64;i+)j=(ipi-1);m_ipi=mj;/printf(nIP置换后:);/print(m_ip,64,8);return 1;int ipnizhihuan/IP逆置换int i,j;/print(m0,64,8);for(i=0;i<64;i+)j=(ip_1i-1);m00i=m0j;/print

15、f(n nizhihuanhoun);/print(m00,64,8);return 1;int pc1zhihuan/PC1置换int i,j;for(i=0;i<56;i+)j=(pc_1i-1);k_pc1i=kj;/printf(npc_1置换后的结果是:);/print(k_pc1,56,7);return 1;int pc2zhihuan(int *ja,int *jb)/PC2置换int i,j;for(i=0;i<48;i+)j=(pc_2i-1);jbi=jaj;/printf(npc_2置换后的结果是:);/print(jb,48,6);return 1;int p

16、zhihuan(int *ja,int *jb)/P置换int i,j;for(i=0;i<32;i+)j=(pi-1);jbi=jaj;/printf(np置换后的结果是:);/print(jb,32,8);return 1;int initlr(int *ja)/初始化l和rint i;for(i=0;i<32;i+)li=jai;for(i=32;i<64;i+)ri-32=jai;/printf(nl是:);/print(l,32,8);/printf(nr是:);/print(r,32,8);return 1;int initcd(int *ja)/初始化C Dint i

17、;for(i=0;i<28;i+)ci=jai;for(i=28;i<56;i+)di-28=jai;/printf(nc是:);/print(c,28,7);/printf(nd是:);/print(d,28,7);return 1;int zuoyi1(int *ja)/以下都是左移int i,temp28;/printf(n左移一位前的结果:);/print(ja,28,7);temp27=ja0;for(i=1;i<28;i+)tempi-1=jai;for(i=0;i<28;i+)jai=tempi;/printf(n左移一位后的结果:);/print(ja,28,7

18、);return 1;int youyi1(int *ja)int i,temp28;/printf(n右移一位之前:n);/print(ja,28,7);temp0=ja27;for(i=1;i<28;i+)tempi=jai-1;for(i=0;i<28;i+)jai=tempi;/printf(n右移一位后的结果:);/print(ja,28,7);return 1;int zuoyi2(int *ja)int i,temp28;/printf(n左移两位前的结果:);/print(ja,28,7);temp26=ja0;temp27=ja1;for(i=0;i<26;i+)

19、tempi=jai+2;for(i=0;i<28;i+)jai=tempi;/printf(n左移两位后的结果:);/print(ja,28,7);return 1;int youyi2(int *ja)int i,temp28;/printf(n右移两位前的结果:);/print(ja,28,7);temp0=ja26;temp1=ja27;for(i=2;i<28;i+)tempi=jai-2;for(i=0;i<28;i+)jai=tempi;/printf(n右移两位后的结果:);/print(ja,28,7);return 1;int exetent(int *ja,in

20、t *jb)/E膨胀int i,k;for(i=0;i<48;i+)k=(exei-1);jbi=jak;/printf(nE膨胀后的结果是:);/print(jb,48,6);return 1;int yihuo48(int *ja,int *jb)/48位异或int i;for(i=0;i<48;i+)jai=(jaijbi);/printf(n异或后的结果是:);/print(ja,48,6);return 1;int yihuo32(int *ja,int *jb)int i;for(i=0;i<32;i+)jai=(jaijbi);/printf(n异或后的结果是:);/

21、print(ja,32,8);return 1;int shzhihuan(int *ja,int *jb)/S盒置换int i,j,a,b,temp;for(j=0;j<8;j+)i=j*6;a=jai*2+jai+5*1;b=jai+1*8+jai+2*4+jai+3*2+jai+4*1;temp=sjab;i=j*4+3;while(temp>1)jbi=(int) (temp%2);temp=(int) (temp/2);i-;switch(temp)case 0:jbi=0;break;case 1:jbi=1;break;while(i%4!=0)i-;jbi=0;/pri

22、ntf(n经过s盒置换后结果是:);/print(jb,32,8);return 1;int zuhecd(int *ja,int *jb)/将C D组合int i;for(i=0;i<28;i+)cdi=jai;cdi+28=jbi;/print(cd,56,7);return 1;int zhuanhuan(int *ja,int *jb)/将32位的jb赋值给jaint i;for(i=0;i<32;i+)jai=jbi;return 1;int zuhe64(int *ja,int *jb,int *jc)int i;for(i=0;i<32;i+)jci=jai;jci+

23、32=jbi;return 1;int erjinzhi_to_ascii(int *jz,int *jg)/二进制转换成ASCII码int i,j;for(i=0;i<8;i+)j=i*8;jgi=(jzj*128+jzj+1*64+jzj+2*32+jzj+3*16+jzj+4*8+jzj+5*4+jzj+6*2+jzj+7*1);return 1;int mainint i,signal;printf(DES 加密与解密 t(加密输入1，解密输入2)n);scanf(%d,&signal);input(signal);miyaoinput;ipzhihuan;initlr(m_ip)

24、;pc1zhihuan;initcd(k_pc1);for(i=0;i<16;i+)if(i>0)initcd(cd);if(signal=1)if(i=0|i=1|i=8|i=15)zuoyi1(c);zuoyi1(d);elsezuoyi2(c);zuoyi2(d);else if(signal=2)if(i=1|i=8|i=15)youyi1(c);youyi1(d);else if(i=0)zuhecd(c,d);pc2zhihuan(cd,k_pc2);zhuanhuan(tempr,r);exetent(r,re);yihuo48(re,k_pc2);shzhihuan(r

25、e,sh);pzhihuan(sh,r);yihuo32(r,l);zhuanhuan(l,tempr);continue;elseyouyi2(c);youyi2(d);zuhecd(c,d);pc2zhihuan(cd,k_pc2);zhuanhuan(tempr,r);exetent(r,re);yihuo48(re,k_pc2);shzhihuan(re,sh);pzhihuan(sh,r);yihuo32(r,l);zhuanhuan(l,tempr);zhuanhuan(tempr,l);zhuanhuan(l,r);zhuanhuan(r,tempr);zuhe64(l,r,m0);ipnizhihuan;erjinzhi_to_ascii(m00,res);printf(n结果是:n);for(i=0;i<8;i+)printf(%d ,resi);printf(n);for(i=0;i<8;i+)printf(%c ,resi);return 1;