1、#include#include#includevoid show1() /主界面printf(“nnntt* DES加密解密系统 *nn“);printf(“tt-n“);/printf(“tt-n“);printf(“tt*n“);printf(“tt*tttttt*n“);printf(“tt*tttttt*n“);printf(“tt*ttt1.加密ttt*n“);printf(“tt*tttttt*n“);printf(“tt*ttt2.解密ttt*n“ );printf(“tt*tttttt*n“);printf(“tt*ttt3.退出ttt*n“);printf(“tt*tttt
2、tt*n“);printf(“tt*tttttt*n“);printf(“tt-n“);void show2() /加密界面printf(“nnntt* DES加密 *nn“);printf(“tt-n“);printf(“tt*n“);printf(“tt*tttttt*n“);printf(“tt*t请选择明文和密钥的输入方式 :tt*n“);printf(“tt*tttttt*n“);printf(“tt*tt1.直接输入ttt*n“);printf(“tt*tttttt*n“);printf(“tt*tt2.从文件读取ttt*n“);printf(“tt*tttttt*n“);prin
3、tf(“tt*tt3.退出 tttt*n“);printf(“tt*tttttt*n“);printf(“tt-n“);printf(“ttt选择:“);void reader(char str30,char s8) /读取明文和密钥FILE *fp;fp=fopen(str,“r“);if(fp=NULL)printf(“明文读取失败 !n“);elsefscanf(fp,“%s“,s);fclose(fp);void To2Bin(char p8,int b64) /将字节转换成二进制流int i,k=0;for(i=0;i=1) if(j else bk+=0; int IP_Table
4、64 = /初始置换(IP) 57, 49, 41, 33, 25, 17, 9, 1,59, 51, 43, 35, 27, 19, 11, 3,61, 53, 45, 37, 29, 21, 13, 5,63, 55, 47, 39, 31, 23, 15, 7,56, 48, 40, 32, 24, 16, 8, 0,58, 50, 42, 34, 26, 18, 10, 2,60, 52, 44, 36, 28, 20, 12, 4,62, 54, 46, 38, 30, 22, 14, 6; int E_Table = /扩展变换E31, 0, 1, 2, 3, 4,3, 4, 5,
5、 6, 7, 8,7, 8, 9, 10, 11, 12,11, 12, 13, 14, 15, 16,15, 16, 17, 18, 19, 20,19, 20, 21, 22, 23, 24,23, 24, 25, 26, 27, 28,27, 28, 29, 30, 31, 0;int S_Box8416 = /8个s盒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, 3,1
6、0, 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、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, 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,
8、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, 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
9、,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, 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
10、, 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 IP_1_Table64 = /逆初始置换IP-1 39, 7, 47, 15, 55, 23, 63, 31,38, 6, 46, 14, 54, 22, 62, 30,37, 5, 45,
11、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, 25,32, 0, 40, 8, 48, 16, 56, 24;int P_Table32 = /置换运算P15,6,19,20,28,11,27,16, 0,14,22,25,4,17,30,9, 1,7,23,13,31,26,2,8, 18,12,29,5,21,10,3,24; int PC_156 =56,48,40,
12、32,24,16,8, /密钥置换PC_10,57,49,41,33,25,17, 9,1,58,50,42,34,26, 18,10,2,59,51,43,35, 62,54,46,38,30,22,14, 6,61,53,45,37,29,21, 13,5,60,52,44,36,28, 20,12,4,27,19,11,3; int PC_248 = /密钥置换PC_213,16,10,23,0,4,2,27,14,5,20,9,22,18,11,3,25,7,15,6,26,19,12,1, 40,51,30,36,46,54,29,39,50,44,32,47,43,48,38,55
13、,33,52,45,41,49,35,28,31; void Replacement(int arry1,int arry2,int arry3,int num) /置换函数(初始IP，逆初始IP，int i,tmp;for(i=0;i=0;j-)tempj=shai%2;shai=shai/2;for(j=0;j=0;j-)if(arryij=1)t=1;for(k=0;k=0;j-)if(arryij=1)t=1;for(k=0;k7-j;k+)t=t*2;temp+=t;bi=temp;void F_Function(int a32,int b32,int n) /F函数int i;in
14、t tmp48;int tep32;Replacement(a,E_Table,tmp,48); /扩展变换E/*printf(“n第%d轮E盒扩展结果:“,n);for(i=0;i48;i+)if(i%8=0)printf(“ “);printf(“%d“,tmpi);*/for(i=0;i48;i+) /与子密钥异或tmpi = Kni;/*printf(“n进入S盒的48比特:“);for(i=0;i48;i+)if(i%6=0)printf(“ “);printf(“%d“,tmpi);*/S_compress(tmp,tep); /压缩变换SReplacement(tep,P_Tab
15、le,b,32); /置换运算P/*printf(“n第%d次P置盒输出:“,l+);for(i=0;i32;i+)if(i%8=0)printf(“ “);printf(“%d“,bi);*/*printf(“nf%d的输出结果:“,n);for(i=0;i32;i+)if(i%8=0)printf(“ “);printf(“%d“,bi);*/void Encryption(int m064,int c164)int i,k;int arry32;int c064,m164;Replacement(m0,IP_Table,m1,64); /初始置换IP/*printf(“n初始置换 :“)
16、;for(i=0;i64;i+)if(i%8=0)printf(“ “);printf(“%d“,m1i);*/for(i=0;i32;i+)L0i=m1i;R0i=m1i+32;k=1;while(k17)F_Function(Rk-1,arry,k-1);for(i=0;i32;i+)Lki=Rk-1i;Rki=Lk-1iarryi;k+;for(i=0;i32;i+)c0i=R16i;c0i+32=L16i;Replacement(c0,IP_1_Table,c1,64); /逆初始置换void changeKey(int a1648)int i,j;int tmp1648;for(i=
17、0;i16;i+)for(j=0;j48;j+)tmpij=aij;for(i=0;i16;i+)for(j=0;j48;j+)Kij=tmp15-ij;void Decryption(int c1,int m)int c064,t64;int i,k;int arry32;changeKey(K);/*printf(“n交换后的密钥 :n“);for(i=0;i16;i+)printf(“n“);for(j=0;j48;j+)if(j%8=0)printf(“ “);printf(“%d“,Kij);*/Replacement(c1,IP_Table,c0,64); /初始IPfor(i=0
18、;i32;i+)L0i=c0i;R0i=c0i+32;k=1;while(k17)F_Function(Rk-1,arry,k-1);for(i=0;i32;i+)Lki=Rk-1i;Rki=Lk-1iarryi;k+;for(i=0;i32;i+)ti=R16i;ti+32=L16i;Replacement(t,IP_1_Table,m,64); /逆初始置换void print() /输出函数int i;int a12,b12,d316;int p64,q64;for(i=0;i32;i+)pi=L15i;p32+i=R15i;qi=R16i;qi+32=L16i;To10(K14,a,4
19、8);To10(K15,b,48);To10(c,d0,64);To10(p,d1,64);To10(q,d2,64);printf(“ntt15轮密钥 :“);for(i=0;i12;i+)printf(“%x“,ai);printf(“t15轮结果:“);for(i=0;i16;i+)printf(“%X“,d1i);printf(“ntt16轮密钥:“ );for(i=0;i12;i+)printf(“%X“,bi);printf(“t16轮结果:“);for(i=0;i16;i+)printf(“%X“,d2i);printf(“ntt最后结果:“);for(i=0;i16;i+)pr
20、intf(“%X“,d0i);/*printf(“n最后结果二进制 :“);for(i=0;i64;i+)printf(“%d“,ci);*/int main()int num,i,t;char s18,s28;int m64; /m存放二进制明文/ 密文int d64; /存放二进制密钥int s8;show1();printf(“ttinput you choice:“);while(1)scanf(“%d“,switch(num)case 1:system(“cls“); /调用清屏函数show2();scanf(“%d“,if(num=1)while(strlen(s1)!=8)pri
21、ntf(“tt请输入明文(8):“);scanf(“%s“,s1);To2Bin(s1,m); /将明文转换成二进制流while(strlen(s2)!=8)printf(“tt请输入密钥(8):“);scanf(“%s“,s2);To2Bin(s2,d); /将密钥转换成二进制/*printf(“n初始二进制明文:“);for(i=0;i64;i+)printf(“%d“,mi);*/*printf(“n初始二进制密钥:“);for(i=0;i64;i+)printf(“%d“,di);*/SubKey(d);/*printf(“n16轮子密钥如下:“);for(i=0;i16;i+)pri
22、ntf(“nK%d:“,i+1);for(j=0;j48;j+)if(j%8=0)printf(“ “);printf(“%d“,Kij);*/Encryption(m,c);/*printf(“n16次迭代左结果:“);for(i=0;i17;i+)printf(“nL%d:“,i);for(j=0;j32;j+)if(j%8=0)printf(“ “);printf(“%d“,Lij);printf(“n16次迭代右结果:“);for(i=0;i17;i+)printf(“nR%d:“,i);for(j=0;j32;j+)if(j%8=0)printf(“ “);printf(“%d“,R
23、ij);*/print();/*printf(“n二进制密文:“);for(i=0;i64;i+)printf(“%d“,ci);*/printf(“ntt按0将此密文解密,1返回上一层,2 返回主界面,其他键退出.“);scanf(“%d“,if(t=0)int s8;int a64;Decryption(c,a);/*printf(“n解密后的二进制:“);for(i=0;i64;i+)printf(“%d“,ai);*/To102(a,s,64);printf(“ntt解密结果:“);for(i=0;i8;i+)printf(“%c“,si);printf(“ntt按1加密,2解密,3退
24、出“);else if(t=1)system(“cls“);show2();else if(t=2)system(“cls“);show1();elseexit(0);else if(num=2)char str120,str220;printf(“tt请输入明文文件名:“);scanf(“%s“,str1);reader(str1,s1);To2Bin(s1,m);printf(“tt请输入密钥文件名:“);scanf(“%s“,str2);reader(str2,s2);To2Bin(s2,d);SubKey(d);Encryption(m,c);print();printf(“ntt按0
25、将此密文解密,1将密文存入文件,2 返回主界面,其他键退出.“);scanf(“%d“,if(t=0)int a64;Decryption(c,a);/*printf(“n解密后的二进制:“);for(i=0;i64;i+)printf(“%d“,ai);*/To102(a,s,64);printf(“ntt解密结果:“);for(i=0;i8;i+)printf(“%c“,si);printf(“ntt按1加密,2解密,3退出“);else if(t=1)int a16;char str30;FILE *fw;printf(“ntt请输入文件名:“);scanf(“%s“,str);fw=f
26、open(str,“w“);if(fw=NULL)printf(“ntt文件打开失败!n“ );elseTo10(c,a,64);for(i=0;i16;i+)fprintf(fw,“%X“,ai);fclose(fw);printf(“ntt密文保存成功!按1加密,2解密,3退出“);else if(t=2)system(“cls“);show1();elseexit(0);else if(num=3)system(“cls“);exit(0);elseprintf(“ntt输入不正确，请重新输入:“);break;case 2:system(“cls“);printf(“nntt-DES解
27、密-“);while(strlen(s1)!=8)printf(“nnntt请输入密文(8):“);scanf(“%s“,s1);To2Bin(s1,m);while(strlen(s2)!=8)printf(“tt请输入密钥(8):“);scanf(“%s“,s2);To2Bin(s2,d);SubKey(d);Decryption(m,c);print();printf(“ntt按1返回上一层,2返回主界面,其他键退出.“);scanf(“%d“,if(t=1)system(“cls“);printf(“nntt-DES解密-“);while(strlen(s1)!=8)printf(“n
28、ntt请输入密文(8):“);scanf(“%s“,s1);To2Bin(s1,m);while(strlen(s2)!=8)printf(“tt请输入密钥(8):“);scanf(“%s“,s);To2Bin(s2,d);SubKey(d);Decryption(m,c);print();else if(t=2)system(“cls“);show1();elseexit(0);break;case 3:system(“cls“);exit(0);default:printf(“输入不正确，请重新输入 :“);return 0;程序中有大部分的注释代码，去掉注释可查看各部分中间结果，如:十六轮子密钥，十六轮结果等
