C语言实现des加密
DES加密解密纯C语言实现
#include<stdio.h>#include<stdlib.h>#include<string.h>void show1() //主界面{printf("\n\n\n\t\t*************** DES加密解密系统******************\n\n");printf("\t\t--------------------------------------------------\n");//printf("\t\t--------------------------------------------------\n");printf("\t\t**************************************************\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t**\t\t\t1.加密\t\t\t**\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t**\t\t\t2.解密\t\t\t**\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t**\t\t\t3.退出\t\t\t**\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t--------------------------------------------------\n");}void show2() //加密界面{printf("\n\n\n\t\t****************** DES加密**********************\n\n");printf("\t\t--------------------------------------------------\n");printf("\t\t**************************************************\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t**\t请选择明文和密钥的输入方式:\t\t**\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t**\t\t1.直接输入\t\t\t**\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t**\t\t2.从文件读取\t\t\t**\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t**\t\t3.退出\t\t\t\t**\n");printf("\t\t**\t\t\t\t\t\t**\n");printf("\t\t--------------------------------------------------\n");printf("\t\t\t选择:");}void reader(char str[30],char s[8]) //读取明文和密钥{FILE *fp;fp=fopen(str,"r");if(fp==NULL){printf("明文读取失败!\n");}else{fscanf(fp,"%s",s);}fclose(fp);}void To2Bin(char p[8],int b[64]) //将字节转换成二进制流{int i,k=0;for(i=0;i<8;i++){int j=0x80;for(;j;j>>=1){if(j&p[i]){b[k++]=1;}else{b[k++]=0;}}}}int IP_Table[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, 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_Box[8][4][16] = { //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, 3,10, 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, 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, 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},{ 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 IP_1_Table[64] = //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, 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_Table[32] = //置换运算P{15,6,19,20,28,11,27,16,0,14,22,25,4,17,30,9,1,7,23,13,31,26,2,8,18,12,29,5,21,10,3,24};int PC_1[56] ={56,48,40,32,24,16,8, //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_2[48] = //密钥置换PC_2{13,16,10,23,0,4,2,27,14,5,20,9,22,18,11,3,25,7,15,6,26,19,12,1,40,51,30,36,46,54,29,39,50,44,32,47,43,48,38,55,33,52,45,41,49,35,28,31};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<num;i++){tmp=arry2[i];arry3[i]=arry1[tmp];}}int move_times[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}; //对左移位的规定void lif_move(int arry1[],int arry2[],int n) //左移位实现函数{int i;for(i=0;i<28;i++){arry2[i]=arry1[(n+i)%28];}}int K[16][48]; //存放16轮子密钥int c[64]; //存放明文或密文int L[17][32],R[17][32]; //存放加密过程中左右部分void SubKey(int K0[64]) //子密钥产生函数{int i;int K1[56],K2[56];int C[17][28],D[17][28];Replacement(K0,PC_1,K1,56); //密钥置换PC_1for(i=0;i<28;i++) //将PC_1输出的56比特分为左右两部分{C[0][i]=K1[i];D[0][i]=K1[i+28];}i=0;while(i<16){int j;lif_move(C[i],C[i+1],move_times[i]);lif_move(D[i],D[i+1],move_times[i]);for(j=0;j<28;j++){K2[j]=C[i+1][j];K2[j+28]=D[i+1][j];}Replacement(K2,PC_2,K[i],48); //密钥置换PC_2i++;}/*printf("\n子密钥生成过程中，左边生成的值:");for(i=0;i<17;i++){int j;printf("\nC[%d]:",i);for(j=0;j<28;j++){if(j%7==0){printf(" ");}printf("%d",C[i][j]);}}printf("\n子密钥生成过程中，右边生成的值:");for(i=0;i<17;i++){int j;printf("\nD[%d]:",i);for(j=0;j<28;j++){if(j%7==0){printf(" ");}printf("%d",D[i][j]);}}*/}void S_compress(int arry[],int shc[]) //S盒压缩变换，其中数组shc存放经过s盒的结果{int h,l; //行，列int sha[8]; //存放经过s盒的十进制结果int i,j;int temp[4];for(i=0;i<8;i++) //s盒压缩变换{h=arry[(1+(i*6))-1]*2 + arry[(6+(i*6))-1];l =arry[(2+(i*6))-1]*8 + arry[(3+(i*6))-1]*4 + arry[(4+(i*6))-1]*2 + arry[(5+(i*6))-1];sha[i]=S_Box[i][h][l];}for(i=0;i<8;i++){for(j=3;j>=0;j--){sha[i]=sha[i]/2;}for(j=0;j<4;j++){shc[4*i+j]=temp[j];}}/*printf("\n第%d次s盒的输出:",m++);for(i=0;i<32;i++){if(i%8==0){printf(" ");}printf("%d",shc[i]);}*/}void To10(int a[], int b[],int n)//二进制转十进制{int i,j;int temp;int arry[16][4];for(i=0;i<n/4;i++){for(j=0;j<4;j++){arry[i][j]=a[4*i+j];}}for (i=0;i<n/4;i++){temp=arry[i][0]*8+arry[i][1]*4+arry[i][2]*2+arry[i][3]*1;/*for(j=3;j>=0;j--){if(arry[i][j]==1){t=1;for(k=0;k<3-j;k++){t=t*2;}}}*/b[i]=temp;}}void To102(int a[], int b[],int n)//二进制转十进制{int i,j;int temp;int arry[8][8];int t=1,k;for(i=0;i<n/8;i++){for(j=0;j<8;j++){arry[i][j]=a[8*i+j];}}for (i=0;i<n/8;i++){temp=0;for(j=7;j>=0;j--){if(arry[i][j]==1){t=1;for(k=0;k<7-j;k++){t=t*2;}temp+=t;}}b[i]=temp;}}void F_Function(int a[32],int b[32],int n) //F函数{int i;int tmp[48];int tep[32];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;i<48;i++){if(i%8==0)printf(" ");printf("%d",tmp[i]);}*/for(i=0;i<48;i++) //与子密钥异或{tmp[i] ^= K[n][i];}/*printf("\n进入S盒的48比特:");for(i=0;i<48;i++){if(i%6==0){printf(" ");}printf("%d",tmp[i]);}*/S_compress(tmp,tep); //压缩变换SReplacement(tep,P_Table,b,32); //置换运算P/*printf("\n第%d次P置盒输出:",l++);for(i=0;i<32;i++){if(i%8==0)printf(" ");printf("%d",b[i]);}*//*printf("\nf[%d]的输出结果:",n);for(i=0;i<32;i++){if(i%8==0){printf(" ");}printf("%d",b[i]);}*/}void Encryption(int m0[64],int c1[64]){int i,k;int arry[32];int c0[64],m1[64];Replacement(m0,IP_Table,m1,64); //初始置换IP/*printf("\n初始置换:");for(i=0;i<64;i++){if(i%8==0)printf(" ");printf("%d",m1[i]);}*/for(i=0;i<32;i++){L[0][i]=m1[i];R[0][i]=m1[i+32];}k=1;while(k<17){F_Function(R[k-1],arry,k-1);for(i=0;i<32;i++){L[k][i]=R[k-1][i];R[k][i]=L[k-1][i]^arry[i];}k++;}for(i=0;i<32;i++){c0[i]=R[16][i];c0[i+32]=L[16][i];}Replacement(c0,IP_1_Table,c1,64); //逆初始置换}void changeKey(int a[16][48]){int i,j;int tmp[16][48];for(i=0;i<16;i++)for(j=0;j<48;j++){tmp[i][j]=a[i][j];}}for(i=0;i<16;i++){for(j=0;j<48;j++){K[i][j]=tmp[15-i][j];}}}void Decryption(int c1[],int m[]){int c0[64],t[64];int i,k;int arry[32];changeKey(K);/*printf("\n交换后的密钥:\n");for(i=0;i<16;i++){printf("\n");for(j=0;j<48;j++){if(j%8==0){printf(" ");}printf("%d",K[i][j]);}}*/Replacement(c1,IP_Table,c0,64); //初始IP for(i=0;i<32;i++){L[0][i]=c0[i];R[0][i]=c0[i+32];}k=1;while(k<17)F_Function(R[k-1],arry,k-1);for(i=0;i<32;i++){L[k][i]=R[k-1][i];R[k][i]=L[k-1][i]^arry[i];}k++;}for(i=0;i<32;i++){t[i]=R[16][i];t[i+32]=L[16][i];}Replacement(t,IP_1_Table,m,64); //逆初始置换}void print() //输出函数{int i;int a[12],b[12],d[3][16];int p[64],q[64];for(i=0;i<32;i++){p[i]=L[15][i];p[32+i]=R[15][i];q[i]=R[16][i];q[i+32]=L[16][i];}To10(K[14],a,48);To10(K[15],b,48);To10(c,d[0],64);To10(p,d[1],64);To10(q,d[2],64);printf("\n\t\t15轮密钥:");for(i=0;i<12;i++){printf("%x",a[i]);}printf("\t15轮结果:");for(i=0;i<16;i++){printf("%X",d[1][i]);printf("\n\t\t16轮密钥:");for(i=0;i<12;i++){printf("%X",b[i]);}printf("\t16轮结果:");for(i=0;i<16;i++){printf("%X",d[2][i]);}printf("\n\t\t最后结果:");for(i=0;i<16;i++){printf("%X",d[0][i]);}/*printf("\n最后结果二进制:");for(i=0;i<64;i++){printf("%d",c[i]);}*/}int main(){int num,i,t;char s1[8],s2[8];int m[64]; //m存放二进制明文/密文int d[64]; //存放二进制密钥int s[8];show1();printf("\t\tinput you choice:");while(1){scanf("%d",&num);switch(num){case 1:system("cls"); //调用清屏函数show2();{scanf("%d",&num);if(num==1){while(strlen(s1)!=8){printf("\t\t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("\t\t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;i<64;i++){printf("%d",m[i]);}*//*printf("\n初始二进制密钥:");for(i=0;i<64;i++){printf("%d",d[i]);}*/SubKey(d);/*printf("\n16轮子密钥如下:");for(i=0;i<16;i++){printf("\nK[%d]:",i+1);for(j=0;j<48;j++){if(j%8==0)printf(" ");printf("%d",K[i][j]);}}*/Encryption(m,c);/*printf("\n16次迭代左结果:");for(i=0;i<17;i++){printf("\nL[%d]:",i);for(j=0;j<32;j++){if(j%8==0){printf(" ");}printf("%d",L[i][j]);}}printf("\n16次迭代右结果:");for(i=0;i<17;i++){printf("\nR[%d]:",i);for(j=0;j<32;j++){if(j%8==0){printf(" ");}printf("%d",R[i][j]);}}*/print();/*printf("\n二进制密文:");for(i=0;i<64;i++){printf("%d",c[i]);}*/printf("\n\t\t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",&t);if(t==0){int s[8];int a[64];Decryption(c,a);/*printf("\n解密后的二进制:");for(i=0;i<64;i++){printf("%d",a[i]);}*/To102(a,s,64);printf("\n\t\t解密结果:");for(i=0;i<8;i++){printf("%c",s[i]);}printf("\n\t\t按1加密,2解密,3退出");}else if(t==1){system("cls");show2();}else if(t==2){system("cls");show1();}else{exit(0);}}else if(num==2){char str1[20],str2[20];printf("\t\t请输入明文文件名:");scanf("%s",str1);reader(str1,s1);To2Bin(s1,m);printf("\t\t请输入密钥文件名:");scanf("%s",str2);reader(str2,s2);To2Bin(s2,d);SubKey(d);Encryption(m,c);print();printf("\n\t\t按0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",&t);if(t==0){int a[64];Decryption(c,a);/*printf("\n解密后的二进制:");for(i=0;i<64;i++){printf("%d",a[i]);}*/To102(a,s,64);printf("\n\t\t解密结果:");for(i=0;i<8;i++){printf("%c",s[i]);}printf("\n\t\t按1加密,2解密,3退出");}else if(t==1){int a[16];char str[30];FILE *fw;printf("\n\t\t请输入文件名:");scanf("%s",str);fw=fopen(str,"w");if(fw==NULL){printf("\n\t\t文件打开失败!\n");}else{To10(c,a,64);for(i=0;i<16;i++){fprintf(fw,"%X",a[i]);}}fclose(fw);printf("\n\t\t密文保存成功!按1加密,2解密,3退出");}else if(t==2){system("cls");show1();}else{exit(0);}}else if(num==3){system("cls");exit(0);}else{printf("\n\t\t输入不正确，请重新输入:");}}break;case 2:{system("cls");printf("\n\n\t\t------------------DES解密----------------");while(strlen(s1)!=8){printf("\n\n\n\t\t请输入密文(8):");scanf("%s",s1);}To2Bin(s1,m);while(strlen(s2)!=8){printf("\t\t请输入密钥(8):");scanf("%s",s2);}To2Bin(s2,d);SubKey(d);Decryption(m,c);print();printf("\n\t\t按1返回上一层,2返回主界面,其他键退出.....");scanf("%d",&t);if(t==1){system("cls");printf("\n\n\t\t---------------DES解密-------------");while(strlen(s1)!=8){printf("\n\n\t\t请输入密文(8):");scanf("%s",s1);}To2Bin(s1,m);while(strlen(s2)!=8){printf("\t\t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();}else{exit(0);}}break;case 3:system("cls");exit(0);default:printf("输入不正确，请重新输入:");}}return 0;}说明：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，十六轮结果等程序运行主界面：加密界面：运行结果一：运行结果二：。
加密算法 c语言
加密算法 c语言C语言是一种广泛应用于计算机科学领域的编程语言，它具有高效、灵活、可靠的特点。
在密码学中，加密算法是一种用于保护信息安全的重要工具。
本文将介绍一些常见的加密算法和在C语言中的实现。
一、对称加密算法对称加密算法是一种使用相同的密钥进行加密和解密的算法。
其中，最常见的对称加密算法是DES（Data Encryption Standard）和AES（Advanced Encryption Standard）。
1. DES算法DES算法是一种将64位明文加密为64位密文的块加密算法。
它使用56位的密钥和一系列的置换、替换和移位操作来进行加密。
C语言中可以使用openssl库中的函数来实现DES算法的加密和解密。
2. AES算法AES算法是一种使用128位、192位或256位密钥进行加密和解密的块加密算法。
它使用一系列的置换、替换和线性变换操作来进行加密。
C语言中可以使用openssl库中的函数来实现AES算法的加密和解密。
二、非对称加密算法非对称加密算法是一种使用不同的密钥进行加密和解密的算法。
其中，最常见的非对称加密算法是RSA（Rivest-Shamir-Adleman）算法。
1. RSA算法RSA算法是一种基于数论的非对称加密算法。
它使用一对公钥和私钥来进行加密和解密。
C语言中可以使用openssl库中的函数来实现RSA算法的加密和解密。
三、散列函数散列函数是一种将任意长度的输入映射为固定长度输出的算法。
其中，最常见的散列函数是MD5（Message Digest Algorithm 5）和SHA（Secure Hash Algorithm）系列算法。
1. MD5算法MD5算法是一种广泛使用的散列函数，它将任意长度的输入映射为128位的输出。
C语言中可以使用openssl库中的函数来实现MD5算法。
2. SHA算法SHA算法是一系列散列函数，其中最常见的是SHA-1、SHA-256和SHA-512。
DES算法的C语言实现
DES算法的C语⾔实现利⽤C语⾔实现DES算法，分组密码原理过程很简单，但是在写的过程中检查了好久才发现错误原因，主要有两点：1.在加密过程16轮迭代过程中，最后⼀轮迭代运算后的结果并没有进⾏交换，即C=IP-1（R16，L16），这样做的⽬的是为了加密解密使⽤同⼀个算法2.在S盒的过程中，移位后应该加括号，否则+的优先级⾼于<<,会出错，下⾯是算法源码：1 #include "des.h"2 #include <stdio.h>3 #include <stdlib.h>45const unsigned char IP_table[64] = {658, 50, 42, 34, 26, 18, 10, 2,760, 52, 44, 36, 28, 20, 12, 4,862, 54, 46, 38, 30, 22, 14, 6,964, 56, 48, 40, 32, 24, 16, 8,1057, 49, 41, 33, 25, 17, 9, 1,1159, 51, 43, 35, 27, 19, 11, 3,1261, 53, 45, 37, 29, 21, 13, 5,1363, 55, 47, 39, 31, 23, 15, 714 };1516const unsigned char IPR_table[64] = {1740, 8, 48, 16, 56, 24, 64, 32,1839, 7, 47, 15, 55, 23, 63, 31,1938, 6, 46, 14, 54, 22, 62, 30,2037, 5, 45, 13, 53, 21, 61, 29,2136, 4, 44, 12, 52, 20, 60, 28,2235, 3, 43, 11, 51, 19, 59, 27,2334, 2, 42, 10, 50, 18, 58, 26,2433, 1, 41, 9, 49, 17, 57, 2525 };2627const unsigned char E_table[48] = {2832, 1, 2, 3, 4, 5,294, 5, 6, 7, 8, 9,308, 9, 10, 11, 12, 13,3112, 13, 14, 15, 16, 17,3216, 17, 18, 19, 20, 21,3320, 21, 22, 23, 24, 25,3424, 25, 26, 27, 28, 29,3528, 29, 30, 31, 32, 136 };3738const unsigned char P_table[32] = {3916, 7, 20, 21, 29, 12, 28, 17,401, 15, 23, 26, 5, 18, 31, 10,412, 8, 24, 14, 32, 27, 3, 9,4219, 13, 30, 6, 22, 11, 4, 2543 };4445const unsigned char PC1_table[56] = {4657, 49, 41, 33, 25, 17, 9,471, 58, 50, 42, 34, 26, 18,4810, 2, 59, 51, 43, 35, 27,4919, 11, 3, 60, 52, 44, 36,5063, 55, 47, 39, 31, 23, 15,517, 62, 54, 46, 38, 30, 22,5214, 6, 61, 53, 45, 37, 29,5321, 13, 5, 28, 20, 12, 454 };5556const unsigned char LOOP_table[16] = {571, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 158 };5960const unsigned char PC2_table[48] = {6114, 17, 11, 24, 1, 5,623, 28, 15, 6, 21, 10,6323, 19, 12, 4, 26, 8,6416, 7, 27, 20, 13, 2,6541, 52, 31, 37, 47, 55,6630, 40, 51, 45, 33, 48,6744, 49, 39, 56, 34, 53,6846, 42, 50, 36, 29, 3269 };7071const unsigned char sbox[8][4][16] = {72// S17314, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,740, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,754, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,7615, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,77//S27815, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,793, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,800, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,8113, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,82//S38310, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,8413, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,8513, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,861, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,87//S4887, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,8913, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,9010, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,913, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,92//S5932, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,9414, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,954, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,9611, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,97//S69812, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,9910, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,1009, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,1014, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,102//S71034, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,10413, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,1051, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,1066, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,107//S810813, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,1091, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,1107, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,1112, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11112 };113114void ByteToBit(unsigned char* out, const unsigned char* in, const int bits){115for(int i=0;i<bits;i++)116out[i]=(in[i/8]>>(7-i%8))&1;117 }118119void BitToByte(unsigned char* out, const unsigned char* in, const int bits){120 memset(out, 0, (bits + 7) / 8);121for(int i=0;i<bits;i++)122out[i/8]|=in[i]<<(7-i%8);123 }124125void Transform(unsigned char* out,const unsigned char* in, const unsigned char* table, const int len){ 126 unsigned char tmp[64] = {0};127for (int i = 0; i < len; i++)128 tmp[i] = in[table[i] - 1];129 memcpy(out, tmp, len);130 }131132void RotateL(unsigned char* in, const int len, int loop){133static unsigned char tmp[64];134 memcpy(tmp, in, len);135 memcpy(in, in + loop, len - loop);136 memcpy(in + len - loop, tmp, loop);137 }138139static unsigned char subKey[16][48] = { 0 };140void setKey(const unsigned char* in){141char key[64] = { 0 };142 ByteToBit(key, in, 64);143char temp[56]={0};144 Transform(temp, key, PC1_table, 56);145for(int i=0;i<16;i++){146 RotateL(temp, 28, LOOP_table[i]);147 RotateL(temp + 28, 28, LOOP_table[i]);148 Transform(subKey[i], temp, PC2_table, 48);149 }150 }151152void xor(unsigned char* in1,const unsigned char* in2,int len){153for(int i=0;i<len;i++)154 in1[i]^=in2[i];155 }156157void sbox_exchange(unsigned char* out,const unsigned char* in){158char row, column;159for (int i = 0; i < 8; i++){160char num = 0;161 row = (in[6 * i]<<1)+ in[6 * i + 5];162 column = (in[6 * i + 1] << 3) + (in[6 * i + 2] << 2) + (in[6 * i + 3] << 1) + in[6 * i + 4]; 163 num = sbox[i][row][column];164for (int j = 0; j < 4; j++)165 {166out[4 * i + j] = (num >> (3 - j)) & 1;167 }168 }169 }170171void F_func(unsigned char* out,const unsigned char* in,unsigned char* subKey){172 unsigned char temp[48]={0};173 unsigned char res[32]={0};174 Transform(temp, in, E_table, 48);175 xor(temp,subKey,48);176 sbox_exchange(res,temp);177 Transform(out, res, P_table, 32);178 }179180void encryptDES(unsigned char* out,const unsigned char* in, const unsigned char* key){ 181 unsigned char input[64] = { 0 };182 unsigned char output[64] = { 0 };183 unsigned char tmp[64] = { 0 };184 ByteToBit(input, in, 64);185 Transform(tmp, input, IP_table, 64);186char* Li = &tmp[0], *Ri = &tmp[32];187 setKey(key);188for(int i=0;i<16;i++){189char temp[32]={0};190 memcpy(temp,Ri,32);191 F_func(Ri, Ri,subKey[i]);192 xor(Ri, Li, 32);193 memcpy(Li,temp,32);194 }195 RotateL(tmp, 64, 32);//the input is LR,output is RL196 Transform(output, tmp, IPR_table, 64);197 BitToByte(out, output,64);198 }199200void decryptDES(unsigned char* out,const unsigned char* in, const unsigned char* key){ 201 unsigned char input[64] = { 0 };202 unsigned char output[64] = { 0 };203 unsigned char tmp[64] = { 0 };204 ByteToBit(input, in, 64);205 Transform(tmp, input, IP_table, 64);206char* Li = &tmp[0], *Ri = &tmp[32];207 setKey(key);208 RotateL(tmp, 64, 32);209for (int i = 0; i < 16; i++){210char temp[32] = { 0 };211 memcpy(temp, Li, 32);212 F_func(Li, Li,subKey[15 - i]);213 xor(Li, Ri, 32);214 memcpy(Ri, temp, 32);215 }216 Transform(output, tmp, IPR_table, 64);217 BitToByte(out, output, 64);218 }。
用c语言实现des算法
用c语言实现des算法由于DES算法被广泛应用于加密和数据安全方面，因此在计算机科学领域，了解和实现DES算法是非常重要的。
C语言是一种强大的编程语言，其通用性和高效性使其成为实现DES算法的理想选择。
以下是使用C语言实现DES算法的步骤和方法：1.将明文和密钥转换为二进制格式在DES算法中，明文和密钥必须先转换为二进制格式才能进行加密或解密操作。
可以使用一个字符串数组来存储明文和密钥，然后使用C 语言的位运算符将每个字符转换为二进制格式。
2.对明文进行初始置换DES算法的第一步是对明文进行初始置换。
可以使用一个int型数据来存储初始置换后的结果。
3.密钥生成使用密钥生成算法来生成16个48位的子密钥。
可以使用一个二维数组来存储每个子密钥。
4.将初始置换后的明文分为左右两个部分将初始置换后的明文分为左右两个部分，每个部分32位。
5.进行16轮迭代在每轮迭代中，右半部分32位的明文和48位的子密钥进行异或运算，然后使用S盒置换和P盒置换来处理数据。
最后将结果与左半部分32位的明文异或，以更新下一轮迭代所需的数据。
6.合并左右两个部分在进行最后一轮迭代后，将左右两个部分合并成一段64位的二进制数据。
7.进行最后的逆置换使用逆置换来处理上一步生成的64位二进制数据，以生成最终的密文。
实现DES算法需要一定的数学知识和编程技能，因此建议有一定编程基础的人才尝试实现此算法。
列表：1.使用C语言实现DES算法步骤2.将明文和密钥转换为二进制格式的方法3.对明文进行初始置换的具体过程4.密钥生成算法的原理和实现方法5.如何将初始置换后的明文分为左右两个部分6.DES算法16轮迭代的详细过程7.如何合并左右两个部分的数据8.DES算法中的最后一步逆置换的作用和过程9.DES算法的应用场景和重要性10.如何使用C语言实现DES算法的具体步骤和技巧。
C语言的DES和3DES算法能真正运行
Linux下c语言实现DES和3DES算法(2010-12-09 20:56:21)转载分类：IT技术标签：linuxcdes3des加解密对称算法it一、DES算法理论DES算法属于对称加密算法，在一些对安全性要求较高的交易中运用广泛，如支付行业等。
关于DES算法的理论，网上有很多文章都有详细的讲解，写得很好，我这里不再赘述，这里给出链接：，请朋友们自己去学习，我的代码也是依据这里的理论写的。
二、实现环境及文件a、环境：Redhat Linux + cb、实现文件：des.hdes.cmakefile三、代码1、des.h文件//功能：实现DES及3DES加解密的算法//作者：XXX//日期：2008-9-23#ifndef DES_H#define DES_Hstatic int pc_1_table[56]={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};static int pc_2_table[48]={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};static int ls_num_table[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};static int ip_table[64]={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, 1,59,51,43,35,27,19,11, 3,61,53,45,37,29,21,13, 5,63,55,47,39,31,23,15, 7};static int ip_1_table[64]={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};static int e_table[48]={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};static int p_table[32]={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};static int s_box_table[8][4][16]={{{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}},{{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, 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, 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},{ 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}}};//函数声明int Do_DES(char* strSrc, char* strKey, char* strDest, char flag); #endif2、des.c文件//功能：实现DES及3DES加解密的算法//作者：XXX//日期：2008-9-23#include <stdio.h>#include <stdlib.h>#include <string.h>#include "des.h"//函数声明int Do_DES(char* strSrc, char* strKey, char* strDest, char flag);int Do_3DES(char* strSrc, char* strKey, char* strDest, char flag);//主函数int main(int argc, char** argv){char src16[16+1],key16[16+1],key48[48+1],dest16[16+1];if(argc != 3){fprintf(stderr,"Usage: [%s -e|-d s|3]\n",argv[0]);exit(1);}if(strcmp(argv[2],"-s") == 0){if(strcmp(argv[1],"-e") == 0){fprintf(stderr,"Please input the string that you want to encrypt(16 hex number):\n");memset(src16,0,sizeof(src16));scanf("%s",src16);fprintf(stderr,"Please input the Key string(16 hex number):\n");memset(key16,0,sizeof(key16));scanf("%s",key16);memset(dest16,0,sizeof(dest16));Do_DES(src16,key16,dest16,'e');fprintf(stderr,"Result: [%s]\n",dest16);}else if(strcmp(argv[1],"-d") == 0){fprintf(stderr,"Please input the string that you want to decrypt(16 hex number):\n");memset(src16,0,sizeof(src16));scanf("%s",src16);fprintf(stderr,"Please input the Key string(16 hex number):\n");memset(key16,0,sizeof(key16));scanf("%s",key16);memset(dest16,0,sizeof(dest16));Do_DES(src16,key16,dest16,'d');fprintf(stderr,"Result: [%s]\n",dest16);}elsereturn -1;}else if(strcmp(argv[2],"-3") == 0){if(strcmp(argv[1],"-e") == 0){fprintf(stderr,"Please input the string that you want to encrypt(16 hex number):\n");memset(src16,0,sizeof(src16));scanf("%s",src16);fprintf(stderr,"Please input the Key string(16 hex number):\n");memset(key48,0,sizeof(key48));scanf("%s",key48);memset(dest16,0,sizeof(dest16));Do_3DES(src16,key48,dest16,'e');fprintf(stderr,"Result: [%s]\n",dest16);}else if(strcmp(argv[1],"-d") == 0){fprintf(stderr,"Please input the string that you want to decrypt(16 hex number):\n");memset(src16,0,sizeof(src16));scanf("%s",src16);fprintf(stderr,"Please input the Key string(16 hex number):\n");memset(key48,0,sizeof(key48));scanf("%s",key48);memset(dest16,0,sizeof(dest16));Do_3DES(src16,key48,dest16,'d');fprintf(stderr,"Result: [%s]\n",dest16);}elsereturn -1;}elsereturn -1;return 0;}//做DES加密或解密运算int Do_DES(char* strSrc, char* strKey, char* strDest, char flag){int i,j;unsigned char subKey[16][48+1],byte8[8+1],bits[64+1],strTmp[64+1]; unsigned char L0[32+1],R0[32+1],Lx[32+1],Rx[32+1];if(!( flag == 'e' || flag == 'E' || flag == 'd' || flag == 'D'))return -1;if(strSrc == NULL || strKey == NULL)return -2;if(flag == 'e' || flag == 'E'){memset(byte8,0,sizeof(byte8));BCDToByte(strKey, 16, byte8);memset(bits,0,sizeof(bits));ByteToBit(byte8, 8, bits);Des_GenSubKey(bits,subKey);BCDToByte(strSrc, 16, byte8);ByteToBit(byte8, 8, bits);Des_IP(bits, strTmp);memcpy(L0,strTmp,32);memcpy(R0,strTmp+32,32);for(i=0;i<16;i++){memcpy(Lx,R0,32);Des_F(R0,subKey[i],Rx);Do_XOR(L0,32,Rx);memcpy(L0,Lx,32);memcpy(R0,Rx,32);}memcpy(bits,R0,32);memcpy(bits+32,L0,32);Des_IP_1(bits,strTmp);BitToByte(strTmp,64,byte8);ByteToBCD(byte8,8,strDest);}else{memset(byte8,0,sizeof(byte8));BCDToByte(strKey, 16, byte8);memset(bits,0,sizeof(bits));ByteToBit(byte8, 8, bits);Des_GenSubKey(bits,subKey);BCDToByte(strSrc, 16, byte8);ByteToBit(byte8, 8, bits);Des_IP(bits, strTmp);memcpy(L0,strTmp,32);memcpy(R0,strTmp+32,32);for(i=0;i<16;i++){memcpy(Lx,R0,32);Des_F(R0,subKey[15-i],Rx);Do_XOR(L0,32,Rx);memcpy(L0,Lx,32);memcpy(R0,Rx,32);}memcpy(bits,R0,32);memcpy(bits+32,L0,32);Des_IP_1(bits,strTmp);BitToByte(strTmp,64,byte8);ByteToBCD(byte8,8,strDest);}return 0;}//做3DES加密或解密运算int Do_3DES(char* strSrc, char* strKey, char* strDest, char flag) {unsigned char strBCDKey[32+1],strByteKey[16+1]; unsigned char strMidDest1[16+1],strMidDest2[16+1]; unsigned char strLKey[16+1],strMKey[16+1],strRKey[16+1];if(!( flag == 'e' || flag == 'E' || flag == 'd' || flag == 'D'))return -1;if(strSrc == NULL || strKey == NULL)return -2;if(strlen(strKey) < 32)return -3;if(flag == 'e' || flag == 'E'){memset(strBCDKey,0,sizeof(strBCDKey));memcpy(strBCDKey,strKey,32);memset(strLKey,0,sizeof(strLKey));memcpy(strLKey,strBCDKey,16);memset(strRKey,0,sizeof(strRKey));memcpy(strRKey,strBCDKey+16,16);Do_DES(strSrc,strLKey,strMidDest1,'e');Do_DES(strMidDest1,strRKey,strMidDest2,'d');Do_DES(strMidDest2,strLKey,strMidDest1,'e');memcpy(strDest,strMidDest1,16);}else{memset(strBCDKey,0,sizeof(strBCDKey));memcpy(strBCDKey,strKey,32);memset(strLKey,0,sizeof(strLKey));memcpy(strLKey,strBCDKey,16);memset(strRKey,0,sizeof(strRKey));memcpy(strRKey,strBCDKey+16,16);Do_DES(strSrc,strLKey,strMidDest1,'d');Do_DES(strMidDest1,strRKey,strMidDest2,'e');Do_DES(strMidDest2,strLKey,strMidDest1,'d');memcpy(strDest,strMidDest1,16);}return 0;}//对输入的字节串作BCD编码扩展int ByteToBCD(unsigned char* bytes, int count,unsigned char* strBCD) {unsigned char cTmp;int i;for(i=0;i<count;i++){cTmp = (bytes[i] & 0xF0) >> 4;strBCD[i*2] = (cTmp > 9) ? cTmp - 10 + 'A' : cTmp + '0';cTmp = bytes[i] & 0x0F;strBCD[i*2+1] = (cTmp > 9) ? cTmp - 10 + 'A' : cTmp + '0';}return (count*2);}//把输入的BCD编码串还原成字节串int BCDToByte(unsigned char* strBCD, int count, unsigned char* bytes) {unsigned char cTmp;int i;for(i=0;i<count/2;i++){cTmp = strBCD[i*2];if(cTmp >= 'A' && cTmp <= 'F')cTmp = cTmp - 'A' + 10;else if(cTmp >= 'a' && cTmp <= 'f')cTmp = cTmp - 'a' + 10;elsecTmp &= 0x0F;bytes[i] = cTmp << 4;cTmp = strBCD[i*2+1];if(cTmp >= 'A' && cTmp <= 'F')cTmp = cTmp - 'A' + 10;else if(cTmp >= 'a' && cTmp <= 'f')cTmp = cTmp - 'a' + 10;elsecTmp &= 0x0F;bytes[i] += cTmp;}return (count/2);}//把字节串变成比特串int ByteToBit(unsigned char* bytes, int count, unsigned char* strBit) {unsigned char cTmp;int i,j;for(i=0;i<count;i++){cTmp = 0x80;for(j=0;j<8;j++){strBit[i*8+j] = (bytes[i] & cTmp) >> (7-j);cTmp = cTmp >> 1;}}return (count*8);}//把比特串变成字节串int BitToByte(unsigned char* strBit, int count, unsigned char* bytes) {unsigned char cTmp;int i,j;for(i=0;i<(count/8);i++){cTmp = 0x00;for(j=0;j<8;j++){cTmp += (strBit[i*8+j] << (7-j));}bytes[i] = cTmp;}return (count/8);}//做异或操作int Do_XOR(unsigned char* strSrc, int count, unsigned char* strDest) {int i;if(strSrc == NULL || strDest == NULL)return -1;for(i=0;i<count;i++)strDest[i] ^= strSrc[i];return 0;}//des算法PC-1变换，把64比特的密钥K变换成56比特int Des_PC_1(unsigned char* strIn, unsigned char* strOut){int i;for(i=0;i<56;i++)strOut[i] = strIn[pc_1_table[i]-1];return 56;}//des算法PC-2变换，把56比特变换成48比特int Des_PC_2(unsigned char* strIn, unsigned char* strOut){int i;for(i=0;i<48;i++)strOut[i] = strIn[pc_2_table[i]-1];return 48;}//des算法的循环左移位运算int Des_LS(unsigned char* strIn, int count, unsigned char* strOut){int i;for(i=0;i<28;i++)strOut[i] = strIn[(i+count)(];return 28;}//des算法中通过父密钥产生16个48比特位的子密钥int Des_GenSubKey(unsigned char* strKey, unsigned char strSubKey[16][48+1]) {unsigned char tmp[56+1],C0[28+1],D0[28+1],Cx[28+1],Dx[28+1];int i,j;memset(tmp,0,sizeof(tmp));memset(C0,0,sizeof(C0));memset(D0,0,sizeof(D0));memset(Cx,0,sizeof(Cx));memset(Dx,0,sizeof(Dx));Des_PC_1(strKey, tmp);memcpy(C0,tmp,28);memcpy(D0,tmp+28,28);for(i=0;i<16;i++){Des_LS(C0,ls_num_table[i],Cx);Des_LS(D0,ls_num_table[i],Dx);memcpy(tmp,Cx,28);memcpy(tmp+28,Dx,28);Des_PC_2(tmp,strSubKey[i]);memcpy(C0,Cx,28);memcpy(D0,Dx,28);}return 0;}//des算法IP置换int Des_IP(unsigned char* strIn, unsigned char* strOut) {int i;for(i=0;i<64;i++)strOut[i] = strIn[ip_table[i]-1];return 64;}//des算法IP-1置换int Des_IP_1(unsigned char* strIn, unsigned char* strOut) {int i;for(i=0;i<64;i++)strOut[i] = strIn[ip_1_table[i]-1];return 64;}//des算法e变换，将32比特变成48比特int Des_E(unsigned char* strIn, unsigned char* strOut) {int i;for(i=0;i<48;i++)strOut[i] = strIn[e_table[i]-1];return 48;}//des算法P变换int Des_P(unsigned char* strIn, unsigned char* strOut){int i;for(i=0;i<32;i++)strOut[i] = strIn[p_table[i]-1];return 32;}//des算法S盒变换int Des_S_Box(unsigned char* strIn, int nSBox, unsigned char* strOut) {int x,y,i,nValue;unsigned char c;if(nSBox < 1 || nSBox > 8)return -1;x = strIn[0] * 2 + strIn[5];y = strIn[1] * 8 + strIn[2] * 4 + strIn[3] * 2 + strIn[4];nValue = s_box_table[nSBox-1][x][y];c = 0x08;for(i=0;i<4;i++){strOut[i] = (nValue & c) >> (3 - i);c = c >> 1;}return 4;}//des算法F函数，对Ri-1和Ki进行运算int Des_F(unsigned char* strR, unsigned char* strK, unsigned char* strOut){int i,j,k;unsigned char strAftE[48],strPreP[32],sbIn[8][6],sbOut[8][4];for(i=0;i<48;i++)strAftE[i] = strR[e_table[i]-1];Do_XOR(strK, 48, strAftE);for(i=0;i<8;i++)for(j=0;j<6;j++)sbIn[i][j] = strAftE[i*6+j];for(i=0;i<8;i++)Des_S_Box(sbIn[i], i+1, sbOut[i]);for(i=0;i<32;i++)strPreP[i] = sbOut[i/4][i%4];Des_P(strPreP, strOut);return 32;}3、makefile文件all: des@echo 'Compile is OK'des: des.occ -o des des.o@rm des.odes.o: des.ccc -c des.c四、测试数据DES加密测试数据：src: 12345678(33738)key: 99999999(3939393939393939)ret: 3B2C7C7E6829AEDADES解密测试数据：src: 12345678(3B2C7C7E6829AEDA)key: 99999999(3939393939393939)ret: 337383DES加密测试数据：src: 12345678(33738)key: 9999999988888888(39393939393939393838383838383838) ret: 3B2C7C7E6829AEDA3DES解密测试数据：src: 3B2C7C7E6829AEDAkey: 9999999988888888(39393939393939393838383838383838) ret: 12345678(33738)。
DES加解密算法C语言源代码
DES加解密算法C语言源代码以下是一个实现DES加解密算法的C语言源代码，包含了加密和解密函数。
请注意，这个代码只是为了演示DES算法的工作原理，并不是一个完整的、安全的加密算法实现。
```c#include <stdio.h>#include <stdint.h>typedef structuint8_t key[8];uint8_t subkeys[16][6];} DESKey;void generateSubkeys(uint8_t* key, uint8_t subkeys[16][6]) //略过子密钥生成算法的具体实现//这里只是假设生成的子密钥都是随机的，实际生成过程要更复杂for (int i = 0; i < 16; i++)for (int j = 0; j < 6; j++)subkeys[i][j] = (i+j) % 256;}}void DES(uint8_t* input, uint8_t key[8], uint8_t* output, int encrypt)//略过DES加密算法的具体实现DESKey desKey;for (int i = 0; i < 8; i++)desKey.key[i] = key[i];}generateSubkeys(key, desKey.subkeys);//这里只是假设输入输出是8字节长，实际上可以支持任意长度//执行加解密操作if (encrypt)printf("Encrypting: ");} elseprintf("Decrypting: ");}for (int i = 0; i < 8; i++)output[i] = encrypt ? input[i] ^ desKey.subkeys[0][i%6] : input[i] ^ desKey.subkeys[15][i%6];printf("%02X ", output[i]);}printf("\n");int maiuint8_t input[8] = {0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0};uint8_t key[8] = {0xA1, 0xB2, 0xC3, 0xD4, 0xE5, 0xF6, 0x07,0x08};uint8_t output[8];DES(input, key, output, 1);DES(output, key, output, 0);return 0;```在这个代码中，`generateSubkeys` 函数用于生成 16 个子密钥，之后分别在加密和解密函数 `DES` 中使用。
C语言加密与解密算法
C语言加密与解密算法在计算机科学与信息安全领域，加密与解密算法起着至关重要的作用。
加密算法用于将原始数据转换为不可读的密文，而解密算法则用于将密文还原为可读的原始数据。
C语言是一种常用的编程语言，具备高效性和灵活性，适用于加密与解密算法的开发。
本文将介绍几种常用的C语言加密与解密算法。
一、凯撒密码算法凯撒密码算法是一种最简单的替换加密算法，通过将字母按照固定的偏移量进行替换来实现加密与解密。
以下是一个简单的C语言凯撒密码实现例子：```c#include <stdio.h>void caesarEncrypt(char* message, int key) {int i = 0;while (message[i] != '\0') {if (message[i] >= 'a' && message[i] <= 'z') {message[i] = (message[i] - 'a' + key) % 26 + 'a';} else if (message[i] >= 'A' && message[i] <= 'Z') {message[i] = (message[i] - 'A' + key) % 26 + 'A';}i++;}}void caesarDecrypt(char* message, int key) {int i = 0;while (message[i] != '\0') {if (message[i] >= 'a' && message[i] <= 'z') {message[i] = (message[i] - 'a' - key + 26) % 26 + 'a'; } else if (message[i] >= 'A' && message[i] <= 'Z') {message[i] = (message[i] - 'A' - key + 26) % 26 + 'A'; }i++;}}int main() {char message[] = "Hello, World!";int key = 3;printf("Original message: %s\n", message);caesarEncrypt(message, key);printf("Encrypted message: %s\n", message);caesarDecrypt(message, key);printf("Decrypted message: %s\n", message);return 0;}```以上程序演示了凯撒密码的加密与解密过程，通过指定偏移量实现对消息的加密与解密。
des密码算法实验c语言
des密码算法实验c语言以下是一个使用C语言实现DES密码算法的简单实验示例：```c#include <stdio.h>#include <stdlib.h>#include <string.h>#include <openssl/des.h>int main() {// 输入明文char plaintext[8] = "12345678";// 初始化DES密钥DES_cblock key = {0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF};DES_key_schedule keysched;DES_set_key_unchecked(&key, &keysched);// 加密unsigned char ciphertext[8];DES_cblock ivec = {0}; // 初始化向量DES_ncbc_encrypt(plaintext, ciphertext, sizeof(plaintext),&keysched, &ivec, DES_ENCRYPT);// 输出密文printf("Ciphertext: ");for (int i = 0; i < sizeof(plaintext); i++) {printf("%02X", ciphertext[i]);}printf("\n");// 解密unsigned char decryptedtext[8];memset(ivec, 0, sizeof(ivec)); // 重置初始化向量DES_ncbc_encrypt(ciphertext, decryptedtext, sizeof(plaintext), &keysched, &ivec, DES_DECRYPT);// 输出明文printf("Plaintext: ");for (int i = 0; i < sizeof(plaintext); i++) {printf("%c", decryptedtext[i]);}printf("\n");return 0;}```在这个实验中，我们使用了OpenSSL库中的DES函数来实现DES 密码算法。
des加密算法c语言源代码
#include<iostream.h>int IP[64] = {58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7};int IP_1[64] = {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 E[48] = {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};int P[32]={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 };void Char_to_Int(unsigned char in[],int out[],int len){for(int i=0;i<len;i++)out[i]=int(in[i]);}void Int_to_Char(int in[],unsigned char out[],int len){for(int i=0;i<len;i++)out[i]=char(in[i]);}void B_to_H(int in[],unsigned char out[]){for(int i=0;i<16;i++){int temp=in[i*4]*8+in[i*4+1]*4+in[i*4+2]*2+in[i*4+3];switch(temp){case 10 :out[i]='A';break;case 11 :out[i]='B';break;case 12 :out[i]='C';break;case 13 :out[i]='D';break;case 14 :out[i]='E';break;case 15 :out[i]='F';break;default :out[i]=unsigned char(temp+48);break;}}}void H_to_B(unsigned char in[],int out[]){for(int i=0;i<16;i++)switch(in[i]){case 'A':out[i*4]=1;out[i*4+1]=0;out[i*4+2]=1;out[i*4+3]=0;break;case 'B':out[i*4]=1;out[i*4+1]=0;out[i*4+2]=1;out[i*4+3]=1;break;case 'C':out[i*4]=1;out[i*4+1]=1;out[i*4+2]=0;out[i*4+3]=0;break;case 'D':out[i*4]=1;out[i*4+1]=1;out[i*4+2]=0;out[i*4+3]=1;break;case 'E':out[i*4]=1;out[i*4+1]=1;out[i*4+2]=1;out[i*4+3]=0;break;case 'F':out[i*4]=1;out[i*4+1]=1;out[i*4+2]=1;out[i*4+3]=1;break;case '0':out[i*4]=0;out[i*4+1]=0;out[i*4+2]=0;out[i*4+3]=0;break;case '1':out[i*4]=0;out[i*4+1]=0;out[i*4+2]=0;out[i*4+3]=1;break;case '2':out[i*4]=0;out[i*4+1]=0;out[i*4+2]=1;out[i*4+3]=0;break;case '3':out[i*4]=0;out[i*4+1]=0;out[i*4+2]=1;out[i*4+3]=1;break;case '4':out[i*4]=0;out[i*4+1]=1;out[i*4+2]=0;out[i*4+3]=0;break;case '5':out[i*4]=0;out[i*4+1]=1;out[i*4+2]=0;out[i*4+3]=1;break;case '6':out[i*4]=0;out[i*4+1]=1;out[i*4+2]=1;out[i*4+3]=0;break;case '7':out[i*4]=0;out[i*4+1]=1;out[i*4+2]=1;out[i*4+3]=1;break;case '8':out[i*4]=1;out[i*4+1]=0;out[i*4+2]=0;out[i*4+3]=0;break;case '9':out[i*4]=1;out[i*4+1]=0;out[i*4+2]=0;out[i*4+3]=1;break;}}void O_to_B(int in[],int out[],int len){int i,j;for(i=0;i<len;i++)for(j=i*len+7;j>=i*len;j--){out[j]=in[i]%2; in[i]=in[i]/2;}}void B_to_O(int in[],int out[],int len){int j;for(int i=0;i<len;i++){j=8*i;out[i]=in[j]*128+in[j+1]*64+in[j+2]*32+in[j+3]*16+in[j+4]*8+in[j+5]*4+in[j+6]*2+in[j+7]*1;}}void Convert(int in[],int out[],int table[],int len){for(int i=0;i<len;i++)out[i]=in[table[i]-1];}void Divide(int in[],int out1[],int out2[],int len){for(int i=0;i<len;i++)if(i<len/2)out1[i]=in[i];elseout2[i-len/2]=in[i];}//正确void Combine(int in1[],int in2[],int out[],int len){for(int i=0;i<len;i++)if(i<len/2)out[i]=in1[i];elseout[i]=in2[i-len/2];}//正确void RLC1(int in[],int out[],int len){int temp=in[0];for(int i=0;i<len-1;i++)out[i]=in[i+1];out[len-1]=temp;}//正确void RLC2(int in[],int out[],int len){int temp1=in[0],temp2=in[1];for(int i=0;i<len-2;i++)out[i]=in[i+2];out[len-2]=temp1;out[len-1]=temp2;}//正确void COPY(int in[],int out[],int len){for(int i=0;i<len;i++)out[i]=in[i];}//ZHENGQUEvoid XOR(int in1[],int in2[],int out[],int len){for(int i=0;i<len;i++)out[i]=(in1[i]+in2[i])%2;}void GetKey(unsigned char in[],int out[16][48]){int i;int Msg_Int[8],Msg_Bin[64],Msg_Bin_PC1[56],Key_Bin[56],C[17][28],D[17][28];char Msg_H[16];int PC1[56]={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[48]={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};Char_to_Int(in,Msg_Int,8);//正确O_to_B(Msg_Int,Msg_Bin,8);//正确cout<<endl;Convert(Msg_Bin,Msg_Bin_PC1,PC1,56); Divide(Msg_Bin_PC1,C[0],D[0],56);for(i=0;i<16;i++){if(i==0){RLC1(C[i],C[i+1],28);RLC1(D[i],D[i+1],28);}else if(i==1){RLC1(C[i],C[i+1],28);RLC1(D[i],D[i+1],28);}else if(i==8){RLC1(C[i],C[i+1],28);RLC1(D[i],D[i+1],28);}else if(i==15){RLC1(C[i],C[i+1],28);RLC1(D[i],D[i+1],28);}else{RLC2(C[i],C[i+1],28);RLC2(D[i],D[i+1],28);}Combine(C[i+1],D[i+1],Key_Bin,56);Convert(Key_Bin,out[i],PC2,48);}} //生成子密钥正确void S_box(int in[],int out[]){int i;int SBox[8][64] ={{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},{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},{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12},{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},{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,},{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},{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12},{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 s1,s3,s2[8];for(i=0;i<8;i++){s1=in[i*6]*2+in[i*6+5]*1;s3=in[i*6+1]*8+in[i*6+2]*4+in[i*6+3]*2+in[i*6+4]*1;s2[i]=SBox[i][s1*16+s3];}int j;for(i=0;i<8;i++)for(j=i*4+3;j>=i*4;j--){out[j]=s2[i]%2; s2[i]=s2[i]/2;}}void Encode(unsigned char in[],unsigned char Final_H[],int K[16][48]){int i;intORINT[8],ORBYTE[64],FinalBYTE[64],LR[64],R48[48],S_in[48],S_out[32],F_RL[32],FinalINT[8],L[17] [32],R[17][32];char ORH[16];Char_to_Int(in,ORINT,8);cout<<""<<endl;O_to_B(ORINT,ORBYTE,8);Convert(ORBYTE,LR,IP,64);Divide(LR,L[0],R[0],64);for(i=1;i<17;i++){Convert(R[i-1],R48,E,48);XOR(R48,K[i-1],S_in,48);S_box(S_in,S_out);Convert(S_out,F_RL,P,32);XOR(F_RL,L[i-1],R[i],32);COPY(R[i-1],L[i],32);}Combine(R[16],L[16],LR,64);Convert(LR,FinalBYTE,IP_1,64);cout<<"二进制的密文:"<<endl;for(i=0;i<64;i++){cout<<FinalBYTE[i];}cout<<endl<<endl;B_to_H(FinalBYTE,Final_H);}void DeCode(unsigned char in[],unsigned char Final_H[],int K[16][48]){int i;intORINT[8],ORBYTE[64],LR[64],R48[48],S_in[48],S_out[32],F_RL[32],FinalBYTE[64],FinalINT[8],L[17] [32],R[17][32];char ORH[16];Char_to_Int(in,ORINT,8);cout<<""<<endl;O_to_B(ORINT,ORBYTE,8);Convert(ORBYTE,LR,IP,64);Divide(LR,L[0],R[0],64);for(i=1;i<17;i++){COPY(R[i-1],L[i],32);Convert(R[i-1],R48,E,48);XOR(R48,K[16-i],S_in,48);S_box(S_in,S_out);Convert(S_out,F_RL,P,32);XOR(L[i-1],F_RL,R[i],32);}Combine(R[16],L[16],LR,64);Convert(LR,FinalBYTE,IP_1,64);B_to_H(FinalBYTE,Final_H);}void main(){int i;unsigned char Msg[8],UnCodeMsg[16],CodeMsg[16],Key[8],Msg_H[16],CodeChar[8];int SKey[16][48];int OrByte[64],OrInt[8],FinalByte[64],FinalInt[8];cout<<"请输入明文："<<endl;for(i=0;i<8;i++)cin>>Msg[i];cout<<"请输入初始密钥："<<endl;for(i=0;i<8;i++)cin>>Key[i];GetKey(Key,SKey);Encode(Msg,CodeMsg,SKey);cout<<"十六进制的密文："<<endl;for(i=0;i<16;i++)cout<<CodeMsg[i];cout<<endl;cout<<"字符型密文："<<endl;H_to_B(CodeMsg,FinalByte);B_to_O(FinalByte,FinalInt,8);Int_to_Char(FinalInt,CodeChar,8);for(i=0;i<8;i++)cout<<CodeChar[i];cout<<endl;cout<<"请输入十六进制的密文："<<endl;for(i=0;i<16;i++)cin>>CodeMsg[i];B_to_O(FinalByte,FinalInt,8);Int_to_Char(FinalInt,CodeChar,8);cout<<"请输入解密密钥："<<endl;for(i=0;i<8;i++)cin>>Key[i];GetKey(Key,SKey);DeCode(CodeChar,Msg_H,SKey);//for(i=0;i<16;i++)// cout<<Msg_H[i];cout<<endl;H_to_B(Msg_H,OrByte);B_to_O(OrByte,OrInt,8);Int_to_Char(OrInt,Msg,8);cout<<"明文是："<<endl;for(i=0;i<8;i++)cout<<Msg[i];cout<<endl;}。
关于实现C#8字节的DES加密算法（DESCryptoServiceProvider）
关于实现C#8字节的DES加密算法（DESCryptoServiceProvider）1.参考资料（1）原理（2）代码<1>C语⾔<2>C#2.C#实现（8字节加密）public class DES{private static int[] C, D;private int[] R, L;public int[] Data;public int[] Ciphertext = new int[64];public static int[] Key;private static int[] Temp, Kong;public static int[,] ZiKeyS = new int[16, 48];private static int[] PC_1HE;private static int[] ShiftHE;private static int[] PC_2HE;private int[] IP_Output;private int[] IPHE;private int[] EHE;private int[,] SHE;private int[] PHE;private int[] FMethod;private int[] SHEOutput;private int[] PHEOutput;private int[] IP_1HE;private int[] XorOutput;public byte[] ciphertext = new byte[8];public DES(){C = new int[28] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };D = new int[28] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };R = new int[32] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };L = new int[32] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };XorOutput = new int[48]{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};FMethod = new int[48]{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};SHEOutput = new int[32] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };PHEOutput = new int[32] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };Data = new int[64]{58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7};Key = new int[64] { 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0 };IP_Output = new int[64] { 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0 }; PC_1HE = new int[56] {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 };Temp = new int[56] {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 };Kong = new int[56] {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 };PC_2HE = new int[48]{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};ShiftHE = new int[16] { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };SHE = new int[8, 64]{{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 },{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 },{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12 },{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 },{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3 },{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 },{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12 },{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 }};IP_1HE = new int[64]{ 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 };EHE = new int[48] {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 };PHE = new int[32] { 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 };IPHE = new int[64]{58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7};}public void Encryption(int flag, int count, ref byte[] data_1){for (int n = 0; n < count; n++){BTD(data_1, n);int[] IP_ip = new int[64] { 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0 };int i;IP_Replace(flag);for (i = 0; i < 16; i++){Ffunction(i, flag);}for (i = 0; i < 32; i++){IP_ip[i] = L[i];IP_ip[i + 32] = R[i];}for (i = 0; i < 64; i++){Ciphertext[i] = IP_ip[IP_1HE[i] - 1];}TTB(ref data_1, n);}}protected void Ffunction(int n, int flag){int i;int[] Lzhongjian = new int[32] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };for (i = 0; i < 48; i++){FMethod[i] = R[EHE[i] - 1];}for (i = 0; i < 48; i++){if (flag == 1){XorOutput[i] = FMethod[i] ^ ZiKeyS[n, i];}else{XorOutput[i] = FMethod[i] ^ ZiKeyS[15 - n, i];}}SHE_Replace();for (i = 0; i < 32; i++){PHEOutput[i] = SHEOutput[PHE[i] - 1];}for (i = 0; i < 32; i++){Lzhongjian[i] = L[i];L[i] = R[i];}for (i = 0; i < 32; i++){if (n != 15){R[i] = Lzhongjian[i] ^ PHEOutput[i];}else{R[i] = L[i];L[i] = Lzhongjian[i] ^ PHEOutput[i];}}}protected void SHE_Replace(){int i, j, S_1, S_2;int[] S_S = new int[] { 0, 0, 0, 0, 0, 0, 0, 0 };for (i = 0; i < 8; i++){S_1 = XorOutput[i * 6] * 2 + XorOutput[i * 6 + 5];S_2 = XorOutput[i * 6 + 1] * 8 + XorOutput[i * 6 + 2] * 4 + XorOutput[i * 6 + 3] * 2 + XorOutput[i * 6 + 4]; S_S[i] = SHE[i, S_1 * 16 + S_2];}for (i = 0; i < 8; i++){for (j = 3; j >= 0; j--){SHEOutput[i * 4 + j] = S_S[i] % 2;S_S[i] = S_S[i] / 2;}}}protected void IP_Replace(int flag){int i;for (i = 0; i < 64; i++){IP_Output[i] = Data[IPHE[i] - 1];}for (i = 0; i < 32; i++){L[i] = IP_Output[i];R[i] = IP_Output[i + 32];}}public static void MiKey(byte[] key_1){int i;BTK(key_1);PC_1();for (i = 0; i < 16; i++){PC_2(ShiftHE[i], i);}}protected static void PC_1(){int i;for (i = 0; i < 56; i++){Temp[i] = Key[PC_1HE[i] - 1];}for (i = 0; i < 28; i++){C[i] = Temp[i];D[i] = Temp[i + 28];}}protected static void Shift_OP(int k){int i;int a = C[0], b = C[1], c = D[0], d = D[1];if (k == 2){for (i = 0; i < 26; i++){C[i] = C[i + 2];D[i] = D[i + 2];}C[26] = a;C[27] = b;D[26] = c;D[27] = d;}else{for (i = 0; i < 27; i++){C[i] = C[i + 1];D[i] = D[i + 1];}C[27] = a;D[27] = c;}}protected static void PC_2(int p, int LunCount){int i;Shift_OP(p);for (i = 0; i < 28; i++){Temp[i] = C[i];Temp[i + 28] = D[i];}for (i = 0; i < 48; i++){ZiKeyS[LunCount, i] = Temp[PC_2HE[i] - 1];}}protected void BTD(byte[] data_1, int _count){int i, j;int[] S_T_1 = new int[8] { 0, 0, 0, 0, 0, 0, 0, 0 };for (i = 0; i < 8; i++){S_T_1[i] = data_1[i + _count * 8];for (j = 0; j < 8; j++){Data[i * 8 + 7 - j] = S_T_1[i] % 2;S_T_1[i] = S_T_1[i] / 2;}}}protected static void BTK(byte[] key_1){int i, j;int[] S_T_1 = new int[8] { 0, 0, 0, 0, 0, 0, 0, 0 };for (i = 0; i < 8; i++){S_T_1[i] = key_1[i];for (j = 0; j < 8; j++){Key[i * 8 + 7 - j] = S_T_1[i] % 2;S_T_1[i] = S_T_1[i] / 2;}}}protected void TTB(ref byte[] buffer, int _count){int i, j;for (i = 0; i < 8; i++){int zeng = 1;int jieguo = 0;for (j = 0; j < 8; j++){if (j == 0){zeng = 1;}else{zeng = zeng * 2;}jieguo += Ciphertext[i * 8 + 7 - j] * zeng;}buffer[i + _count * 8] = (byte)jieguo;}}}internal sealed class Encryption{public static string EncryptDES(string paymnetCode, byte[] = null){var bytesText = Encoding.UTF8.GetBytes(paymnetCode);int mod = bytesText.Length % 8;int sMod = 8 - mod;byte[] mByte = new byte[bytesText.Length + sMod];for (int i = 0; i < bytesText.Length; i++){mByte[i] = bytesText[i];}for (int i = bytesText.Length; i < mByte.Length; i++){mByte[i] = (byte)sMod;}//==============================================================// if (key == null) key = Encoding.ASCII.GetBytes("默认⽹站密钥");byte[] keybuffer = new byte[8];for (int i = 0; i < keybuffer.Length; i++){keybuffer[i] = i < key.Length ? key[i] : (byte)0;}//==============================================================// DES des = new DES();DES.MiKey(keybuffer);//==============================================================// int div = mByte.Length / 8;if ((mByte.Length % 8) != 0) div += 1;byte[][] divmbyte = new byte[div][];for (int i = 0; i < div; i++){divmbyte[i] = new byte[8];divmbyte[i][0] = mByte[i * 8 + 0];divmbyte[i][1] = mByte[i * 8 + 1];divmbyte[i][2] = mByte[i * 8 + 2];divmbyte[i][3] = mByte[i * 8 + 3];divmbyte[i][4] = mByte[i * 8 + 4];divmbyte[i][5] = mByte[i * 8 + 5];divmbyte[i][6] = mByte[i * 8 + 6];divmbyte[i][7] = mByte[i * 8 + 7];}byte[][] divcint = new byte[div][];for (int i = 0; i < div; i++){divcint[i] = new byte[8];des.Encryption(1, 1, ref divmbyte[i]); divcint[i] = divmbyte[i];}byte[] cint = new byte[div * 8];for (int i = 0; i < div; i++){for (int j = 0; j < 8; j++){cint[i * 8 + j] = divcint[i][j];}}return Convert.ToBase64String(cint); }}。
C语言实现CBC模式DES加密
C语⾔实现CBC模式DES加密#define SECTION_SIZE 8 //每段密⽂字节数，DES为8个字节64位#define GET_BIT(x,y) (x |((BYTE)0xff <<9-y) | ((BYTE)0xff >>y)) //将X的第Y位保留，其余位置1#define FORM_DWORD(p1,p2,p3,p4) ((((DWORD)p1) <<24) | (((DWORD)p2) <<16) | (((DWORD)p3) <<8) | ((DWORD)p4)) //四个字节形成⼀个双字#define FORM_BYTE(x,y) ((BYTE)((x & ((DWORD)0xffffffff << 8*(4-y)) & ((DWORD)0xffffffff >> (y-1)*8)) >>(4-y)*8))//将双字X的第Y个字节提取出来#define GET_BIT_LOW(x,y) ((x & ( (BYTE)0xff<<(8-y)) & (BYTE)0xff >> (y-1)) >> (8-y)) //拿到字节X的第Y位//#define ENCRPT //如果定义则为加密，⽆定义为解密#define CHANGE //未⽤//------------------------------------------------------------------------------------------BYTE DisPlaceIPTable[] = { 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, 27, 19, 11, 3,61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7};BYTE DisPlaceRIPTable[] = { 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};BYTE DisPlaceKEYTable[] = { 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, };BYTE MoveCount[] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };BYTE PC_2[] = { 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 };BYTE E_Table[] = { 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 };BYTE S1[4][16] = { 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};BYTE S2[4][16] = { 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 };BYTE S3[4][16] = { 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 };BYTE S4[4][16] = { 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 };BYTE S5[4][16] = { 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 };BYTE S6[4][16] = { 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 };BYTE S7[4][16] = { 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 };BYTE S8[4][16] = { 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 };BYTE result[] = { 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 };//---------------------------------------------------------------------------------typedef struct _BIT{BYTE a : 1;BYTE b : 1;BYTE c : 1;BYTE d : 1;BYTE e : 1;BYTE f : 1;}BIT,*PBIT;typedef struct _8_BIT{BYTE a : 1;BYTE b : 1;BYTE c : 1;BYTE d : 1;BYTE e : 1;BYTE f : 1;BYTE g : 1;BYTE h : 1;}E_BIT,*P4_BIT;LPVOID getTable(int index);DWORD data_rl(DWORD x, BYTE y, BYTE z);PBYTE SHL_Connect(PBYTE p1, PBYTE p2, int index);void ExchangeDword(PVOID p1, PVOID p2);void DisPlaceItem(PVOID fileVa, PBYTE KEY, int length);// DESEncryption.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include "windows.h"#include "myEncpy.h"int _tmain(int argc, _TCHAR* argv[]){//get plaintextHANDLE hFile = CreateFile(L"d:\\a.txt", GENERIC_ALL, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_READONLY, NULL); if (hFile == INVALID_HANDLE_VALUE){printf_s("can not create file... d:a.txt");system("pause");return0;}HANDLE hFileMapping = CreateFileMapping(hFile, 0, PAGE_READWRITE, 0, 0, L"myshare");if (hFileMapping == INVALID_HANDLE_VALUE){printf_s("can not create filemapping");system("pause");return0;}LPVOID fileVa = MapViewOfFile(hFileMapping, FILE_MAP_ALL_ACCESS, 0, 0, 0);if (fileVa == NULL){printf_s("can not get mapview");system("pause");return0;}//printf_s("%s\n", fileVa);//使⽤内存映射打开⼤⽂件//---------------------------------------------------------------//get parameter,key,subkeyBYTE KEY[8] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h' }; //定义密钥DisPlaceItem(KEY, DisPlaceKEYTable,7);PBYTE SubKey[16];BYTE C0[4] = { KEY[0], KEY[1], KEY[2], KEY[3]&0xf0 };BYTE D0[4] = { KEY[3] & 0x0f, KEY[4], KEY[5], KEY[6] };for (int i = 0; i < 16; i++){PBYTE p = SHL_Connect(C0, D0, i);DisPlaceItem(p, PC_2, 6);SubKey[i] = p; //⽣成16个⼦密钥}//-----------------// begain encrypBYTE CBC_IV[] = { 0x11, 0x32, 0x43, 0x54, 0x65, 0x76, 0x87, 0xa8 };//初始化向量未向PBYTE fileOffset =(PBYTE)fileVa; //明⽂起始位置DWORD fileSize = GetFileSize(hFile, 0); //得到明⽂⼤⼩for (DWORD index = 0; index < fileSize / SECTION_SIZE ; index ++) //⽬前只针对凑满8个字节的部分进⾏加密{fileOffset = fileOffset + index *SECTION_SIZE;//for (int i = 0; i < SECTION_SIZE; i++)//{// *(fileOffset + i) ^= CBC_IV[i];//}#ifdef CHANGEDisPlaceItem(fileOffset, DisPlaceIPTable, 8); //IP置换#endif#ifdef ENCRPTfor (int j =0; j <16; j++)#elsefor (int j = 15; j >= 0; j--){#endifBYTE L0[4], R0[6];memcpy(L0, fileOffset, 4);memcpy(R0, fileOffset + 4, 4); //分别拿到左边右边4个字节#ifdef ENCRPTif (j !=15)#elseif (j != 0)#endifmemcpy(fileOffset, R0, 4); //如果不是最后⼀次加密或者解密，则右边直接写回左边elsememcpy(fileOffset + 4, R0, 4);DisPlaceItem(R0, E_Table, 6); //扩展置换PBYTE pbyte1 = SubKey[j];for (int i = 0; i < 6; i++){R0[i] ^= pbyte1[i]; //与右边进⾏异或}//partion----------------------------------------BIT mybit[8] = {0};///////////////////////BYTE t[48]; //把6字节分为6位⼀组共8组int tIndex = 1;int rIdex = 0;for (int i = 0; i < 48; i++){BYTE a = R0[rIdex];t[i] = GET_BIT_LOW(R0[rIdex], tIndex);if (tIndex % 8 == 0){rIdex++;tIndex = 1;}else{tIndex++;}}tIndex = 0;for (int i = 0; i < 48; i+=6){mybit[tIndex].a = t[i];mybit[tIndex].b = t[i+1];mybit[tIndex].c = t[i+2];mybit[tIndex].d = t[i+3];mybit[tIndex].e = t[i+4];mybit[tIndex].f = t[i+5];tIndex++;}//此时mybit⾥⾯放着分组之后的每⼀位////////////////////////BYTE Str[4];int EIndex = 0;BYTE(*tempTable)[16] = 0;for (char i = 0; i < 8; i += 2) //根据mybit拿到表中的数并组合成str{tempTable = (BYTE(*)[16])getTable(i + 1);BYTE sum1 = tempTable[mybit[i].a*2 + mybit[i].f][mybit[i].b*8 + mybit[i].c*4 + mybit[i].d*2 + mybit[i].e];tempTable = (BYTE(*)[16])getTable(i + 2);BYTE sum2 = tempTable[mybit[i + 1].a*2 + mybit[i + 1].f][mybit[i + 1].b*8 + mybit[i + 1].c*4 + mybit[i + 1].d*2 + mybit[i + 1].e]; BYTE sum = sum1 << 4 | sum2;memcpy(Str + EIndex, &sum, 1);EIndex++;}#ifdef CHANGEDisPlaceItem(Str, result, 4); //结果与左边置换#endiffor (int i = 0; i < 4; i++){L0[i] ^= Str[i];}#ifdef ENCRPTif (j != 15)#elseif (j != 0) //将左边写到右边#endifmemcpy(fileOffset + 4, L0, 4);elsememcpy(fileOffset, L0, 4);}#ifdef CHANGEDisPlaceItem(fileOffset, DisPlaceRIPTable, 8);//IP逆置换#endif//memcpy(CBC_IV, fileOffset, 8);//-----------------------------------------------}printf_s("got it");for (int i = 0; i < 16; i++){free(SubKey[i]);}CloseHandle(hFile);CloseHandle(hFileMapping);UnmapViewOfFile(fileVa);system("pause");return0;}void DisPlaceItem(PVOID fileVa,PBYTE KEY,int length) //fileva为需要置换的内容⾸地址 key为置换表,length为输出字节数{PBYTE File = (PBYTE)fileVa;BYTE Result[8] ;memset(Result, 0xff, 8);int DisIndex = 1;for (int i = 0; i < length; i++){int bitofEach = 1;while (true){BYTE temp1 = KEY[DisIndex-1];BYTE ByteIndex = temp1 / 8;ByteIndex = temp1 % 8 == 0 ? ByteIndex -1 : ByteIndex;BYTE BitIndex = temp1- ByteIndex*8;BYTE temptemp = *(File + ByteIndex);if (bitofEach < BitIndex){temptemp = *(File + ByteIndex) << (BitIndex - bitofEach);}else if (bitofEach>BitIndex){temptemp = *(File + ByteIndex) >> (bitofEach - BitIndex);}BYTE t = GET_BIT(temptemp, bitofEach);Result[i] = Result[i] & GET_BIT(temptemp, bitofEach);if (DisIndex % 8 == 0)break;DisIndex++;bitofEach++;}DisIndex++;}memcpy(fileVa, Result, length);}PBYTE SHL_Connect(PBYTE p1, PBYTE p2, int index) //循环移位并连接{PBYTE pbyte = (PBYTE)malloc(7);DWORD d1 = FORM_DWORD(p1[0], p1[1], p1[2], p1[3]);DWORD d2 = FORM_DWORD(p2[0], p2[1], p2[2], p2[3]) <<4;d1 = data_rl(d1, MoveCount[index], 32);d2 = data_rl(d2, MoveCount[index], 32) >>4;for (int i = 0; i < 4; i++){*(p1 + i) = FORM_BYTE(d1, i + 1);*(p2 + i) = FORM_BYTE(d2, i + 1);}memcpy(pbyte, p1, 3);BYTE temp = p1[3] | p2[0];*(pbyte + 3) = temp;memcpy(pbyte + 4, p2, 3);return pbyte;}DWORD data_rl(DWORD x, BYTE y, BYTE z) //移位的实现{DWORD temp;temp = x >> (y - z );temp = temp << 4;x = x << z;x = x | temp;return x;}LPVOID getTable(int index) {switch (index){case1:return S1;break;case2:return S2;break;case3:return S3;break;case4:return S4;break;case5:return S5;break;case6:return S6;break;case7:return S7;break;case8:return S8;break;default:break;}}。
des密码算法程序c语言
des密码算法程序c语言一、概述DES（数据加密标准）是一种常用的对称加密算法，它采用64位的密钥，对数据进行加密和解密。
本程序使用C语言实现DES算法，包括密钥生成、数据加密和解密等操作。
二、算法实现1.密钥生成：使用初始置换算法IP(56位)将明文转化为56位的分组，再将该分组经过一系列的逻辑函数F进行6轮处理，最终生成一个56位的密文。
其中密钥包括56位数据位和8位奇偶校验位。
2.数据加密：将需要加密的数据转化为56位的分组，再经过DES 算法处理，得到密文。
3.数据解密：将密文经过DES算法处理，还原成原始明文。
三、程序代码```c#include<stdio.h>#include<string.h>#include<stdlib.h>#include<time.h>//DES算法参数定义#defineITERATIONS6//加密轮数#defineKEY_LENGTH8//密钥长度，单位为字节#defineBLOCK_SIZE8//数据分组长度，单位为字节#definePADDINGPKCS7Padding//填充方式#defineMAX_INPUT_LENGTH(BLOCK_SIZE*2)//数据输入的最大长度//初始置换函数voidinit_permutation(unsignedcharinput[BLOCK_SIZE]){inti;for(i=0;i<BLOCK_SIZE;i++){input[i]=i;}}//逻辑函数F的定义voidlogic_function(unsignedcharinput[BLOCK_SIZE],unsigned charoutput[BLOCK_SIZE]){inti;for(i=0;i<BLOCK_SIZE;i++){output[i]=input[(i+1)%BLOCK_SIZE]^input[i]^(i+1)/BLOCK_SI ZE;}}//DES算法主函数voiddes_encrypt(unsignedchar*input,unsignedchar*output){ unsignedcharkey[KEY_LENGTH];//密钥数组unsignedchariv[BLOCK_SIZE];//初始置换的输入数组unsignedcharciphertext[MAX_INPUT_LENGTH];//密文数组unsignedcharpadding[BLOCK_SIZE];//填充数组unsignedintlength=strlen((char*)input);//数据长度（以字节为单位）unsignedintpadding_length=(length+BLOCK_SIZE-1)%BLOCK_SIZE;//需要填充的字节数unsignedintround=0;//加密轮数计数器unsignedintj=0;//数据指针，用于循环读取数据和填充数据intkey_offset=((1<<(32-KEY_LENGTH))-1)<<(32-(ITERATIONS*BLOCK_SIZE));//密钥索引值，用于生成密钥数组和填充数组的初始值unsignedintk=0;//DES算法中每个轮次的密钥索引值，用于生成每个轮次的密钥数组和填充数组的值unsignedintkplus1=(k+1)%((1<<(32-BLOCK_SIZE))-1);//DES算法中每个轮次的密钥索引值加一后的值，用于下一个轮次的密钥生成charseed[32];//使用MD5作为初始种子值生成随机数序列chartmp[MAX_INPUT_LENGTH];//临时变量数组，用于数据交换和中间计算结果存储等操作time_tt;//时间戳变量，用于生成随机数序列的种子值srand((unsignedint)time(&t));//设置随机数种子值，确保每次运行生成的随机数序列不同init_permutation(iv);//初始置换操作，将输入数据转化为56位分组（需要重复填充时）或一个随机的分组（不需要重复填充时）memcpy(key,key_offset,sizeof(key));//将初始化的密钥数组复制到相应的位置上，以便于接下来的轮次生成不同的密钥值memcpy(padding,seed,sizeof(seed));//将种子值复制到填充数组中，以便于接下来的轮次生成不同的随机数序列值for(round=0;round<ITERATIONS;round++){//进行加密轮次操作，每轮包括。
DES加密C语言实现源代码
void *memcpy( void *dest, const void *src, unsigned char count ){// ASSERT((dest != NULL)&&(src != NULL));unsigned char *temp_dest = (unsigned char *)dest;unsigned char *temp_src = (unsigned char *)src;while(count--) // 不对是否存在重叠区域进行判断{*temp_dest++ = *temp_src++;}return dest;}unsigned char *memset(unsigned char *dst,unsigned char value,unsigned char count) {unsigned char *start = dst;while (count--)*dst++ = value;return(start);}// 初始置换表IPunsigned char IP_Table[64] = { 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};//逆初始置换表IP^-1unsigned char IP_1_Table[64] = {39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25,32,0,40,8,48,16,56,24};//扩充置换表Eunsigned char E_Table[48] = {31, 0, 1, 2, 3, 4,3, 4, 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};//置换函数Punsigned char P_Table[32] = {15,6,19,20,28,11,27,16, 0,14,22,25,4,17,30,9,1,7,23,13,31,26,2,8,18,12,29,5,21,10,3,24};//S盒unsigned char S[8][4][16] =// 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}}};//置换选择1unsigned char PC_1[56] = {56,48,40,32,24,16,8, 0,57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,35,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,60,52,44,36,28,20,12,4,27,19,11,3};//置换选择2unsigned char PC_2[48] = {13,16,10,23,0,4,2,27,14,5,20,9,22,18,11,3,25,7,15,6,26,19,12,1,40,51,30,36,46,54,29,39,50,44,32,46,43,48,38,55,33,52,45,41,49,35,28,31};// 对左移次数的规定unsigned char MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}; //字节转换成二进制unsigned char ByteToBit(unsigned char ch, unsigned char bit[8]) {unsigned char cnt;for(cnt = 0;cnt < 8; cnt++){*(bit+cnt) = (ch>>cnt)&1;}return 0;}// 二进制转换成字节unsigned char BitToByte(unsigned char bit[8],unsigned char *ch){unsigned char cnt;for(cnt = 0;cnt < 8; cnt++){*ch |= *(bit + cnt)<<cnt;}return 0;}// 将长度为8的字符串转为二进制位串unsigned char Char8ToBit64(unsigned char ch[8],unsigned char bit[64]){unsigned char cnt;for(cnt = 0; cnt < 8; cnt++){ByteToBit(*(ch+cnt),bit+(cnt<<3));}return 0;}// 将二进制位串转为长度为8的字符串unsigned char Bit64ToChar8(unsigned char bit[64],unsigned char ch[8]){unsigned char cnt;memset(ch,0,8);for(cnt = 0; cnt < 8; cnt++){BitToByte(bit+(cnt<<3),ch+cnt);}return 0;}// 密钥置换1unsigned char DES_PC1_Transform(unsigned char key[64], unsigned char tempbts[56]) {unsigned char cnt;for(cnt = 0; cnt < 56; cnt++){tempbts[cnt] = key[PC_1[cnt]];}return 0;}//密钥置换2unsigned char DES_PC2_Transform(unsigned char key[56], unsigned char tempbts[48]) {unsigned char cnt;for(cnt = 0; cnt < 48; cnt++){tempbts[cnt] = key[PC_2[cnt]];}return 0;}//循环左移unsigned char DES_ROL(unsigned char data[56], unsigned char time){unsigned char temp[56];//保存将要循环移动到右边的位memcpy(temp,data,time);memcpy(temp+time,data+28,time);//前28位移动memcpy(data,data+time,28-time);memcpy(data+28-time,temp,time);//后28位移动memcpy(data+28,data+28+time,28-time);memcpy(data+56-time,temp+time,time);return 0;}//IP置换unsigned char DES_IP_Transform(unsigned char data[64]){unsigned char cnt;unsigned char temp[64];for(cnt = 0; cnt < 64; cnt++){temp[cnt] = data[IP_Table[cnt]];}memcpy(data,temp,64);return 0;}// IP逆置换unsigned char DES_IP_1_Transform(unsigned char data[64]) {unsigned char cnt;unsigned char temp[64];for(cnt = 0; cnt < 64; cnt++){temp[cnt] = data[IP_1_Table[cnt]];}memcpy(data,temp,64);return 0;}//扩展置换unsigned char DES_E_Transform(unsigned char data[48]) {unsigned char cnt;unsigned char temp[48];for(cnt = 0; cnt < 48; cnt++){temp[cnt] = data[E_Table[cnt]];}memcpy(data,temp,48);return 0;}//P置换unsigned char DES_P_Transform(unsigned char data[32]) {unsigned char cnt;unsigned char temp[32];for(cnt = 0; cnt < 32; cnt++){temp[cnt] = data[P_Table[cnt]];}memcpy(data,temp,32);return 0;}// 异或unsigned char DES_XOR(unsigned char R[48], unsigned char L[48] ,unsigned char count) {unsigned char cnt;for(cnt = 0; cnt < count; cnt++){R[cnt] ^= L[cnt];}return 0;}// S盒置换unsigned char DES_SBOX(unsigned char data[48]){unsigned char cnt;unsigned char line,row,output;unsigned char cur1,cur2;for(cnt = 0; cnt < 8; cnt++){cur1 = cnt*6;cur2 = cnt<<2;// 计算在S盒中的行与列line = (data[cur1]<<1) + data[cur1+5];row = (data[cur1+1]<<3) + (data[cur1+2]<<2)+ (data[cur1+3]<<1) + data[cur1+4];output = S[cnt][line][row];// 化为2进制data[cur2] = (output&0X08)>>3;data[cur2+1] = (output&0X04)>>2;data[cur2+2] = (output&0X02)>>1;data[cur2+3] = output&0x01;}return 0;}//交换unsigned char DES_Swap(unsigned char left[32], unsigned char right[32]){unsigned char temp[32];memcpy(temp,left,32);memcpy(left,right,32);memcpy(right,temp,32);return 0;}//生成子密钥unsigned char DES_MakeSubKeys(unsigned char key[64],unsigned char subKeys[16][48]) {unsigned char temp[56];unsigned char cnt;DES_PC1_Transform(key,temp);// PC1置换for(cnt = 0; cnt < 16; cnt++) //16轮跌代，产生16个子密钥{DES_ROL(temp,MOVE_TIMES[cnt]);// 循环左移DES_PC2_Transform(temp,subKeys[cnt]);//PC2置换，产生子密钥}return 0;}//加密单个分组unsigned char DES_EncryptBlock(unsigned char plainBlock[8], unsigned char subKeys[16][48], unsigned char cipherBlock[8]){unsigned char plainBits[64];unsigned char copyRight[48];unsigned char cnt;Char8ToBit64(plainBlock,plainBits);//初始置换（IP置换）DES_IP_Transform(plainBits);// 16轮迭代for(cnt = 0; cnt < 16; cnt++){memcpy(copyRight,plainBits+32,32);DES_E_Transform(copyRight); // 将右半部分进行扩展置换，从32位扩展到48位DES_XOR(copyRight,subKeys[cnt],48); // 将右半部分与子密钥进行异或操作DES_SBOX(copyRight); // 异或结果进入S盒，输出32位结果 DES_P_Transform(copyRight); // P置换DES_XOR(plainBits,copyRight,32); //将明文左半部分与右半部分进行异或 if(cnt != 15){DES_Swap(plainBits,plainBits+32);//最终完成左右部的交换}}DES_IP_1_Transform(plainBits); //逆初始置换（IP^1置换）Bit64ToChar8(plainBits,cipherBlock);return 0;}// 解密单个分组unsigned char DES_DecryptBlock(unsigned char cipherBlock[8], unsigned char subKeys[16][48],unsigned char plainBlock[8]){unsigned char cipherBits[64];unsigned char copyRight[48];short cnt;Char8ToBit64(cipherBlock,cipherBits);//初始置换（IP置换）DES_IP_Transform(cipherBits);// 16轮迭代for(cnt = 15; cnt >= 0; cnt--){memcpy(copyRight,cipherBits+32,32);//将右半部分进行扩展置换，从32位扩展到48位DES_E_Transform(copyRight);// 将右半部分与子密钥进行异或操作DES_XOR(copyRight,subKeys[cnt],48);//异或结果进入S盒，输出32位结果DES_SBOX(copyRight);// P置换DES_P_Transform(copyRight);//将明文左半部分与右半部分进行异或DES_XOR(cipherBits,copyRight,32);if(cnt != 0){// 最终完成左右部的交换DES_Swap(cipherBits,cipherBits+32);}}// 逆初始置换（IP^1置换）DES_IP_1_Transform(cipherBits);Bit64ToChar8(cipherBits,plainBlock);return 0;}//加密文件unsigned char DES_Encrypt(unsigned char *keyStr,unsigned char *plainFile,unsigned char *cipherFile){unsigned char keyBlock[8],bKey[64],subKeys[16][48];memcpy(keyBlock,keyStr,8); //设置密钥Char8ToBit64(keyBlock,bKey); //将密钥转换为二进制流 DES_MakeSubKeys(bKey,subKeys); //生成子密钥DES_EncryptBlock(plainFile,subKeys,cipherFile);return 1;}//解密文件unsigned char DES_Decrypt(unsigned char *keyStr,unsigned char *cipherFile,unsigned char *plainFile){// unsigned char plainBlock[8],cipherBlock[8],unsigned char bKey[64],keyBlock[8],subKeys[16][48];memcpy(keyBlock,keyStr,8); //设置密钥Char8ToBit64(keyBlock,bKey); //将密钥转换为二进制流 DES_MakeSubKeys(bKey,subKeys); //生成子密钥DES_DecryptBlock(cipherFile,subKeys,plainFile);return 1;}/****************************************************************************** ****************** 作者：win2kddk* 说明：3重DES是使用16字节密钥将8字节明文数据块进行3次DES加密和解密。
C语言加密与解密算法详解
C语言加密与解密算法详解1. 引言在信息时代，数据的保密性至关重要。
加密与解密算法是一种重要的保护数据安全性的技术手段。
本文将详细介绍C语言中的加密与解密算法，包括常用的对称加密算法和非对称加密算法。
2. 对称加密算法2.1 Caesar密码Caesar密码是一种简单的替换密码算法，通过将每个字母向后移动固定的位数来加密消息。
解密操作是将每个字母向前移动相同的位数。
2.2 DES算法数据加密标准（DES）是一种对称加密算法，使用56位的密钥对64位的数据进行加密。
DES算法通过多轮迭代和复杂的置换与代换操作来实现高强度的加密。
3. 非对称加密算法3.1 RSA算法RSA算法是一种常用的非对称加密算法。
它通过使用两个密钥：一个公钥和一个私钥，来实现加密和解密操作。
发送方使用接收方的公钥进行加密，而接收方使用自己的私钥进行解密。
3.2 椭圆曲线加密算法椭圆曲线加密算法（ECC）是一种基于椭圆曲线数学原理的非对称加密算法。
它具有较小的密钥长度和高安全性的特点，适用于资源受限的设备。
4. 加密与解密实例4.1 使用Caesar密码加密与解密字符串下面是使用C语言实现Caesar密码算法的示例代码： ```// Caesar密码加密函数void caesarEncrypt(char* text, int key) {int i = 0;while (text[i] != '\0') {if (isalpha(text[i])) {if (islower(text[i])) {text[i] = (text[i] - 'a' + key) % 26 + 'a';} else {text[i] = (text[i] - 'A' + key) % 26 + 'A';}}i++;}}// Caesar密码解密函数void caesarDecrypt(char* text, int key) {caesarEncrypt(text, 26 - key);}```4.2 使用RSA算法加密与解密数据下面是使用C语言中的openssl库实现RSA算法的示例代码：```// RSA加密函数int rsaEncrypt(unsigned char* plainText, int plainTextLen, unsigned char* encryptedText) {// 使用公钥进行加密操作// ...}// RSA解密函数int rsaDecrypt(unsigned char* encryptedText, int encryptedTextLen, unsigned char* decryptedText) {// 使用私钥进行解密操作// ...}```5. 总结加密与解密算法在数据保密性方面发挥着重要的作用。
C#DES（cbc）加密解密（最简单的加密解密）
C#DES（cbc）加密解密（最简单的加密解密）微软官⽹的这个⽰例正的是该换了，⼀点⽤处没看出来/// <summary>/// DES CBC 加密/// </summary>/// <param name="encryStr"></param>/// <param name="key"></param>/// <param name="iv"></param>/// <returns></returns>public static string DesCBCEncryptor(string encryStr,string key,string iv){byte[] rgbKey = Encoding.UTF8.GetBytes(key);byte[] rgbIV = Encoding.UTF8.GetBytes(iv);byte[] inputByteArray = Encoding.UTF8.GetBytes(encryStr);DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();using (MemoryStream mStream = new MemoryStream()){using (CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write)) {cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();byte[] srteamArray = mStream.ToArray();mStream.Close();mStream.Dispose();return Convert.ToBase64String(srteamArray);}}}/// <summary>/// DES CBC 解密/// </summary>/// <param name="decryStr"></param>/// <param name="key"></param>/// <param name="iv"></param>/// <returns></returns>public static string DesCBCDecryptor(string decryStr, string key, string iv){byte[] rgbKey = Encoding.UTF8.GetBytes(key);byte[] rgbIV = Encoding.UTF8.GetBytes(iv);byte[] inputByteArray = Convert.FromBase64String(decryStr);DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();using (MemoryStream mStream = new MemoryStream()){using (CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write)) {cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();byte[] srteamArray = mStream.ToArray();mStream.Close();mStream.Dispose();return Encoding.UTF8.GetString(srteamArray);}}}。
C语言实现DES加密解密算法
C语言实现DES加密解密算法
最近几十年里，DES（Data Encryption Standard）算法的发展起到
了极其重要的作用。
Des算法是一种基于分组密码的算法。
算法将64位
的明文数据块按位分组成8个字节，每一组以8位为单位转换成一个64
位的密文数据块，采用16轮的分组加密，每次密码变化，保证加密强度。
本文详细介绍了DES算法的C语言实现，并分别介绍了加解密算法的实现
步骤以及DES加解密测试过程。
一、DES算法C语言实现
1.函数原型
DES算法的实现包括加密和解密函数，函数原型如下：
unsigned char* DesEncrypt(unsigned char *src, unsigned char
*key); // DES加密函数
unsigned char* DesDecrypt(unsigned char *src, unsigned char
*key); // DES解密函数
输入参数src是指明文源数据，key是加解密密钥，输出参数为一个
指向加解密结果的字符串指针。
2.加解密算法
（1）DES加密算法
DES加密算法步骤如下：
（i）初始置换：将64位明文块做一次IP置换得到L0R0。
（ii）迭代轮换：对L0R0经过16次迭代轮换后，最终结果为
L16R16
（iii）逆置换：L16R16进行逆置换得到64位密文。
（2）DES解密算法
DES解密算法步骤和DES加密算法步骤是一样的，只是将置换步骤改为逆置换，将轮换步骤改为逆轮换即可。
三、DES加解密测试
1.程序测试
在C语言编写完DES加解密算法之后。
C语言实现数据加密算法
C语言实现数据加密算法数据加密是对敏感信息进行转换的过程，以保护数据的机密性和完整性。
C语言提供了强大的工具和库来实现各种加密算法，包括对称加密和非对称加密等。
对称加密算法是一种使用相同密钥加密和解密数据的方法。
其中最常见的算法是DES(Data Encryption Standard)和AES(Advanced Encryption Standard)。
下面是一个实现AES算法的示例代码：```c#include <stdio.h>#include <stdlib.h>#include <string.h>#include <openssl/aes.h>void encrypt_data(const unsigned char *data, size_t len, const unsigned char *key, unsigned char *encrypted_data) AES_KEY aes_key;AES_set_encrypt_key(key, 128, &aes_key);AES_encrypt(data, encrypted_data, &aes_key);void decrypt_data(const unsigned char *encrypted_data,size_t len, const unsigned char *key, unsigned char *data) AES_KEY aes_key;AES_set_decrypt_key(key, 128, &aes_key);AES_decrypt(encrypted_data, data, &aes_key);int maiunsigned char data[AES_BLOCK_SIZE] = "hello world!";size_t len = sizeof(data);unsigned char encrypted_data[AES_BLOCK_SIZE];encrypt_data(data, len, key, encrypted_data);unsigned char decrypted_data[AES_BLOCK_SIZE];decrypt_data(encrypted_data, len, key, decrypted_data);printf("Original Data: %s\n", data);printf("Encrypted Data: ");for (int i = 0; i < len; i++)printf("%02x ", encrypted_data[i]);}printf("\nDecrypted Data: %s\n", decrypted_data);return 0;```以上代码使用了OpenSSL库中的AES加密算法。
DES加密C语言实现源代码
void *memcpy( void *dest, const void *src, unsigned char count ){// ASSERT((dest != NULL)&&(src != NULL));unsigned char *temp_dest = (unsigned char *)dest;unsigned char *temp_src = (unsigned char *)src;while(count--) // 不对是否存在重叠区域进行判断{*temp_dest++ = *temp_src++;}return dest;}unsigned char *memset(unsigned char *dst,unsigned char value,unsigned char count) {unsigned char *start = dst;while (count--)*dst++ = value;return(start);}// 初始置换表IPunsigned char IP_Table[64] = { 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};//逆初始置换表IP^-1unsigned char IP_1_Table[64] = {39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25,32,0,40,8,48,16,56,24}; //扩充置换表Eunsigned char E_Table[48] = {31, 0, 1, 2, 3, 4,3, 4, 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};//置换函数Punsigned char P_Table[32] = {15,6,19,20,28,11,27,16,0,14,22,25,4,17,30,9,1,7,23,13,31,26,2,8,18,12,29,5,21,10,3,24};//S盒unsigned char S[8][4][16] =// 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}}};//置换选择1unsigned char PC_1[56] = {56,48,40,32,24,16,8,0,57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,35,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,60,52,44,36,28,20,12,4,27,19,11,3};//置换选择2unsigned char PC_2[48] = {13,16,10,23,0,4,2,27,14,5,20,9,22,18,11,3,25,7,15,6,26,19,12,1,40,51,30,36,46,54,29,39,50,44,32,46,43,48,38,55,33,52,45,41,49,35,28,31};// 对左移次数的规定unsigned char MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}; //字节转换成二进制unsigned char ByteToBit(unsigned char ch, unsigned char bit[8]) {unsigned char cnt;for(cnt = 0;cnt < 8; cnt++){*(bit+cnt) = (ch>>cnt)&1;}return 0;}// 二进制转换成字节unsigned char BitToByte(unsigned char bit[8],unsigned char *ch){unsigned char cnt;for(cnt = 0;cnt < 8; cnt++){*ch |= *(bit + cnt)<<cnt;}return 0;}// 将长度为8的字符串转为二进制位串unsigned char Char8ToBit64(unsigned char ch[8],unsigned char bit[64]){unsigned char cnt;for(cnt = 0; cnt < 8; cnt++){ByteToBit(*(ch+cnt),bit+(cnt<<3));}return 0;}// 将二进制位串转为长度为8的字符串unsigned char Bit64ToChar8(unsigned char bit[64],unsigned char ch[8]){unsigned char cnt;memset(ch,0,8);for(cnt = 0; cnt < 8; cnt++){BitToByte(bit+(cnt<<3),ch+cnt);}return 0;}// 密钥置换1unsigned char DES_PC1_Transform(unsigned char key[64], unsigned char tempbts[56]) {unsigned char cnt;for(cnt = 0; cnt < 56; cnt++){tempbts[cnt] = key[PC_1[cnt]];}return 0;}//密钥置换2unsigned char DES_PC2_Transform(unsigned char key[56], unsigned char tempbts[48]) {unsigned char cnt;for(cnt = 0; cnt < 48; cnt++){tempbts[cnt] = key[PC_2[cnt]];}return 0;}//循环左移unsigned char DES_ROL(unsigned char data[56], unsigned char time){unsigned char temp[56];//保存将要循环移动到右边的位memcpy(temp,data,time);memcpy(temp+time,data+28,time);//前28位移动memcpy(data,data+time,28-time);memcpy(data+28-time,temp,time);//后28位移动memcpy(data+28,data+28+time,28-time);memcpy(data+56-time,temp+time,time);return 0;}//IP置换unsigned char DES_IP_Transform(unsigned char data[64]){unsigned char cnt;unsigned char temp[64];for(cnt = 0; cnt < 64; cnt++){temp[cnt] = data[IP_Table[cnt]];}memcpy(data,temp,64);return 0;}// IP逆置换unsigned char DES_IP_1_Transform(unsigned char data[64]) {unsigned char cnt;unsigned char temp[64];for(cnt = 0; cnt < 64; cnt++){temp[cnt] = data[IP_1_Table[cnt]];}memcpy(data,temp,64);return 0;}//扩展置换unsigned char DES_E_Transform(unsigned char data[48]) {unsigned char cnt;unsigned char temp[48];for(cnt = 0; cnt < 48; cnt++){temp[cnt] = data[E_Table[cnt]];}memcpy(data,temp,48);return 0;}//P置换unsigned char DES_P_Transform(unsigned char data[32]) {unsigned char cnt;unsigned char temp[32];for(cnt = 0; cnt < 32; cnt++){temp[cnt] = data[P_Table[cnt]];}memcpy(data,temp,32);return 0;}// 异或unsigned char DES_XOR(unsigned char R[48], unsigned char L[48] ,unsigned char count) {unsigned char cnt;for(cnt = 0; cnt < count; cnt++){R[cnt] ^= L[cnt];}return 0;}// S盒置换unsigned char DES_SBOX(unsigned char data[48]){unsigned char cnt;unsigned char line,row,output;unsigned char cur1,cur2;for(cnt = 0; cnt < 8; cnt++){cur1 = cnt*6;cur2 = cnt<<2;// 计算在S盒中的行与列line = (data[cur1]<<1) + data[cur1+5];row = (data[cur1+1]<<3) + (data[cur1+2]<<2)+ (data[cur1+3]<<1) + data[cur1+4];output = S[cnt][line][row];// 化为2进制data[cur2] = (output&0X08)>>3;data[cur2+1] = (output&0X04)>>2;data[cur2+2] = (output&0X02)>>1;data[cur2+3] = output&0x01;}return 0;}//交换unsigned char DES_Swap(unsigned char left[32], unsigned char right[32]){unsigned char temp[32];memcpy(temp,left,32);memcpy(left,right,32);memcpy(right,temp,32);return 0;}//生成子密钥unsigned char DES_MakeSubKeys(unsigned char key[64],unsigned char subKeys[16][48]){unsigned char temp[56];unsigned char cnt;DES_PC1_Transform(key,temp);// PC1置换for(cnt = 0; cnt < 16; cnt++) //16轮跌代，产生16个子密钥{DES_ROL(temp,MOVE_TIMES[cnt]);// 循环左移DES_PC2_Transform(temp,subKeys[cnt]);//PC2置换，产生子密钥}return 0;}//加密单个分组unsigned char DES_EncryptBlock(unsigned char plainBlock[8], unsigned char subKeys[16][48], unsigned char cipherBlock[8]){unsigned char plainBits[64];unsigned char copyRight[48];unsigned char cnt;Char8ToBit64(plainBlock,plainBits);//初始置换（IP置换）DES_IP_Transform(plainBits);// 16轮迭代for(cnt = 0; cnt < 16; cnt++){memcpy(copyRight,plainBits+32,32);DES_E_Transform(copyRight); // 将右半部分进行扩展置换，从32位扩展到48位DES_XOR(copyRight,subKeys[cnt],48); // 将右半部分与子密钥进行异或操作DES_SBOX(copyRight); // 异或结果进入S盒，输出32位结果DES_P_Transform(copyRight); // P置换DES_XOR(plainBits,copyRight,32); //将明文左半部分与右半部分进行异或if(cnt != 15){DES_Swap(plainBits,plainBits+32);//最终完成左右部的交换}}DES_IP_1_Transform(plainBits); //逆初始置换（IP^1置换）Bit64ToChar8(plainBits,cipherBlock);return 0;}// 解密单个分组unsigned char DES_DecryptBlock(unsigned char cipherBlock[8], unsigned char subKeys[16][48],unsigned char plainBlock[8]){unsigned char cipherBits[64];unsigned char copyRight[48];short cnt;Char8ToBit64(cipherBlock,cipherBits);//初始置换（IP置换）DES_IP_Transform(cipherBits);// 16轮迭代for(cnt = 15; cnt >= 0; cnt--){memcpy(copyRight,cipherBits+32,32);//将右半部分进行扩展置换，从32位扩展到48位DES_E_Transform(copyRight);// 将右半部分与子密钥进行异或操作DES_XOR(copyRight,subKeys[cnt],48);//异或结果进入S盒，输出32位结果DES_SBOX(copyRight);// P置换DES_P_Transform(copyRight);//将明文左半部分与右半部分进行异或DES_XOR(cipherBits,copyRight,32);if(cnt != 0){// 最终完成左右部的交换DES_Swap(cipherBits,cipherBits+32);}}// 逆初始置换（IP^1置换）DES_IP_1_Transform(cipherBits);Bit64ToChar8(cipherBits,plainBlock);return 0;}//加密文件unsigned char DES_Encrypt(unsigned char *keyStr,unsigned char *plainFile,unsigned char *cipherFile){unsigned char keyBlock[8],bKey[64],subKeys[16][48];memcpy(keyBlock,keyStr,8); //设置密钥Char8ToBit64(keyBlock,bKey); //将密钥转换为二进制流DES_MakeSubKeys(bKey,subKeys); //生成子密钥DES_EncryptBlock(plainFile,subKeys,cipherFile);return 1;}//解密文件unsigned char DES_Decrypt(unsigned char *keyStr,unsigned char *cipherFile,unsigned char *plainFile){// unsigned char plainBlock[8],cipherBlock[8],unsigned char bKey[64],keyBlock[8],subKeys[16][48];memcpy(keyBlock,keyStr,8); //设置密钥Char8ToBit64(keyBlock,bKey); //将密钥转换为二进制流DES_MakeSubKeys(bKey,subKeys); //生成子密钥DES_DecryptBlock(cipherFile,subKeys,plainFile);return 1;}/****************************************************************************** ****************** 作者：win2kddk* 说明：3重DES是使用16字节密钥将8字节明文数据块进行3次DES加密和解密。
DES加密算法的C语言实现
DES加密算法的C语言实现DES（Data Encryption Standard）是一种对称密钥加密算法，它的核心思想是将明文分成64位的数据块，并通过一系列的轮次操作对数据块进行加密，最终得到密文。
下面是一种用C语言实现DES加密算法的示例代码：```c#include <stdio.h>unsigned char initial_permutation(unsigned char block)unsigned char result = 0;result ，= (block & 0x80) >> 7;result ，= (block & 0x40) >> 5;result ，= (block & 0x20) >> 3;result ，= (block & 0x10) >> 1;result ，= (block & 0x08) << 1;result ，= (block & 0x04) << 3;result ，= (block & 0x02) << 5;result ，= (block & 0x01) << 7;return result;unsigned char final_permutation(unsigned char block)unsigned char result = 0;result ，= (block & 0x80) >> 7;result ，= (block & 0x40) >> 5;result ，= (block & 0x20) >> 3;result ，= (block & 0x10) >> 1;result ，= (block & 0x08) << 1;result ，= (block & 0x04) << 3;result ，= (block & 0x02) << 5;result ，= (block & 0x01) << 7;return result;void des_encrypt(unsigned char* plaintext, unsigned char* key, unsigned char* ciphertext)unsigned char block;unsigned char round_key;unsigned char i;// Initial Permutationblock = initial_permutation(*plaintext);// Round Permutationfor (i = 0; i < 16; i++)round_key = key[i];block ^= round_key;block = substitution(block);block = permutation(block);}// Final Permutation*ciphertext = final_permutation(block);int maiunsigned char plaintext = 0x55; // 明文unsigned char key[16] = {0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xEF, 0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10}; // 密钥unsigned char ciphertext;des_encrypt(&plaintext, key, &ciphertext);printf("明文: 0x%02X\n", plaintext);printf("密钥: ");for (unsigned char i = 0; i < 16; i++)printf("%02X ", key[i]);}printf("\n");printf("密文: 0x%02X\n", ciphertext);return 0;```上述代码实现了DES算法的加密功能。
C#DES加密，KEY和IV不同设置的写法
C#DES加密，KEY和IV不同设置的写法1、KEY和IV分别赋值//默认密钥向量private static byte[] Iv= { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };///<summary>/// DES加密字符串///</summary>///<param name="encryptString">待加密的字符串</param>///<param name="encryptKey">加密密钥,要求为8位</param>///<returns>加密成功返回加密后的字符串，失败返回源串</returns>public static string EncryptDES(string encryptString, string encryptKey){try{byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));byte[] rgbIV = Iv;byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();var mStream = new MemoryStream();var cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey,rgbIV), CryptoStreamMode.Write);cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();return Convert.ToBase64String(mStream.ToArray());}catch{return encryptString;}}2、根据8位密钥，建⽴KEY和IVpublic static string Encrypt(string pToEncrypt, string sKey){var des = new DESCryptoServiceProvider();//把字符串放到byte数组中byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);//建⽴加密对象的密钥和偏移量des.Key = Encoding.ASCII.GetBytes(sKey);des.IV = Encoding.ASCII.GetBytes(sKey);var ms = new MemoryStream();var cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();return Encoding.UTF8.GetString(ms.ToArray());}3、KEY和IV为空，调⽤⽅法以创建新的随机key ，调⽤⽅法以创建新的随机 IV using System;using System.Security.Cryptography;using System.Text;class EncryptorExample{private static string quote ="Things may come to those who wait, but only the " +"things left by those who hustle. -- Abraham Lincoln";public static void Main(){AesCryptoServiceProvider aesCSP = new AesCryptoServiceProvider();aesCSP.GenerateKey();aesCSP.GenerateIV();byte[] encQuote = EncryptString(aesCSP, quote);Console.WriteLine("Encrypted Quote:\n");Console.WriteLine(Convert.ToBase64String(encQuote));Console.WriteLine("\nDecrypted Quote:\n");Console.WriteLine(DecryptBytes(aesCSP, encQuote));}public static byte[] EncryptString(SymmetricAlgorithm symAlg, string inString){byte[] inBlock = UnicodeEncoding.Unicode.GetBytes(inString);ICryptoTransform xfrm = symAlg.CreateEncryptor();byte[] outBlock = xfrm.TransformFinalBlock(inBlock, 0, inBlock.Length);return outBlock;}public static string DecryptBytes(SymmetricAlgorithm symAlg, byte[] inBytes){ICryptoTransform xfrm = symAlg.CreateDecryptor();byte[] outBlock = xfrm.TransformFinalBlock(inBytes, 0, inBytes.Length);return UnicodeEncoding.Unicode.GetString(outBlock);}}另外：⼀般DES加密完的字符串⼤概长这样：U2FsdGVkX1+PX0/VZiqtq/fOMdgdX7mTQh3RNACgods=因为有⼀些特殊符号，如果拼在querystring中不便于传输，可以考虑这样写：var str= new StringBuilder();foreach (byte b in ms.ToArray()){str.AppendFormat("{0:X2}", b);}return str.ToString();来代替直接返回return Encoding.UTF8.GetString(ms.ToArray());这样加密后的字符串长这样：4BD2B330AA45FFAD57109EE56D34E21B7E3858BA45A096220EB6634A5B779E80。
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void DES_Swap(ElemType left[32],ElemType right[32]);
void DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]);
{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},
{
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,
{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},
2, 8, 24, 14, 32, 27, 3, 9, 19,13, 30, 6, 22,11, 4, 25
};//p盒置换表
//S盒
int S[8][4][16] =//S1
{{{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7},
void DES_IP_1_Transform(ElemType data[64]);//末置换
void DES_E_Transform(ElemType data[48]);//数据右部扩展
void DES_P_Transform(ElemType data[32]);//p置换
void DES_SBOX(ElemType data[48]);//s置换
#define OK 1
typedef char ElemType;
//初始置换表IP
int IP_Table[64] =
{
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,
{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},
//对左移位数表
int MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
void ByteToBit(ElemType ch,ElemType bit[8]);//字节转换成二进制
void BitToByte(ElemType bit[8],ElemType *ch);//二进制转换成字节
void DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]);//密钥扩展
void DES_ROL(ElemType data[56], int time);//密钥移动方法
void DES_IP_Transform(ElemType data[64]);//初始变换
16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25,
24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1
};//扩展置换表
//置换函数P
int P_Table[32] =
{
16, 7, 20, 21, 29, 12, 28, 17,1, 15, 23, 26,5, 18, 31, 10,
{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}},
//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},
}
}
//将长度为8的字符串转为二进制位串
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
};//密钥压缩表
{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}},
#include "stdio.h"
#include "memory.h"
#include "time.h"
#include "stdlib.h"
#define PLAIN_FILE_OPEN_ERROR -1
#define KEY_FILE_OPEN_ERROR -2
#define CIPHER_FILE_OPEN_ERROR -3
{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}},
*(bit+cnt) = (ch>>cnt)&1;
}
}
//二进制转换成字ElemType *ch){
int cnt;
for(cnt = 0;cnt < 8; cnt++){
*ch |= *(bit + cnt)<<cnt;
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
};//初始置换表
//逆初始置换表IP^-1
int IP_1_Table[64] =
void DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48], ElemType plainBlock[8]);
int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile);//加密方法
//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},
void Char8ToBit64(ElemType ch[8],ElemType bit[64]);//将长度为8的字符串转为二进制位串
void DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]);//生成子密钥
void DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]);//密钥置换
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
};
//置换选择2
int PC_2[48] =
{
14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
//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},
{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},