首先新建头文件des_encode.H
内容如下：
void EncodeMain(); //EncodeMain function
void DecodeMain(); //Sorry ,it has not used
void Decode(int *str,int *keychar); //decode :input 8 chars,8 keychars
void Encode(int *str,int *keychar); //encode: input 8 chars,8 keychars
void keyBuild(int *keychar); //create key array
void StrtoBin(int *midkey,int *keychar); //change into binary
void keyCreate(int *midkey2,int movebit,int i); //call by keyBuild
void EncodeData(int *lData,int *rData,int *srt); //encodedata function
void F(int *rData,int *key); //F function
void Expand(int *rData,int *rDataP); //Expand function
void ExchangeS(int *rDataP,int *rData); //S-diagram change
void ExchangeP(int *rData); //P change
void FillBin(int *rData,int n,int s); // data to binary;call by S-Diagram change function
void DecodeData(int *str,int *lData,int *rData); //DecodeData from binary
int IP1[]={58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, //initial change
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 IP2[]={40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31, //opp initial change
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 s[][4][16]={{ //S-diagram array
{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 Ex[48]={ 32,1,2,3,4,5, //Expand array
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, //P-change
29,12,28,17,
1,15,23,26,
5,18,31,10,
2,8,24,14,
32,27,3,9,
19,13,30,6,
22,11,4,25
};
int PC1[56]={57,49,41,33,25,17,9, //PC-1 in keyBuild
1,58,50,42,34,26,18,
10,2,59,51,43,35,27,
19,11,3,60,52,44,36,
63,55,47,39,31,33,15,
7,62,54,46,38,30,22,
14,6,61,53,45,37,29,
21,13,5,28,20,12,4
};
int PC2[48]={14,17,11,24,1,5, //PC-2 in keyBuild
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
};
再创建des.cpp
内容如下：
#include
#include
#include"des_encode.h"
int key[16][48];
char str[8];
void main() //main function
{
EncodeMain();
}
void EncodeMain() //EncodeMain function
{
int i;
char keychar[8];
int key2[8];
int strkey[8];
printf("请输入8个要加密的字符：\n");
for(i=0;i<8;i++)
scanf("%c",&str[i]);
getchar();
for(i=0;i<8;i++)
strkey[i]=str[i];
printf("\n输入明文的十六进制为:\n");
for(i=0;i<8;i++)
printf("%10x",strkey[i]);
printf("\n请输入密钥(8个字符):\n");
for(i=0;i<8;i++)
scanf("%c",&keychar[i]);
for(i=0;i<8;i++)
key2[i]=keychar[i];
getchar();
// printf("%c",keychar[i]);
Encode(strkey,key2);
printf("\n加密后十六进制密文是:\n");
for(i=0;i<8;i++)
printf("%10x",strkey[i]);
printf("\n\n清输入解密密码\n");
for(i=0;i<8;i++)
scanf("%c",&keychar[i]);
for(i=0;i<8;i++)
key2[i]=keychar[i];
Decode(strkey,key2);
for(i=0;i<8;i++)
printf("%10x",strkey[i]);
for(i=0;i<8;i++)
str[i]=strkey[i];
printf("\n明文为：\t");
for(i=0;i<8;i++)
printf("%c",str[i]);
printf("\n\n");
}
void keyBuild(int *keychar){ //create key array
int i,j;
int movebit[]={1,1,2,2,2,2,2,2,
1,2,2,2,2,2,2,1};
int midkey2[56];
int midkey[64];
StrtoBin(midkey,keychar);
for(i=0;i<56;i++)
midkey2[i]=midkey[PC1[i]-1];
for(i=0;i<16;i++)
keyCreate(midkey2,movebit[i],i);
}
void StrtoBin(int *midkey,int *keychar){ //change into binary
int trans[8],i,j,k,n;
n=0;
for(i=0;i<8;i++){
j=0;
while(keychar[i]!=0){
trans[j]=keychar[i]%2;
keychar[i]=keychar[i]/2;
j++;
}
for(k=j;k<8;k++)trans[k]=0;
for(k=0;k<8;k++)
midkey[n++]=trans[7-k];
}
}
void keyCreate(int *midkey2,int movebit,int n){
int i,temp[4];
temp[0]=midkey2[0];
temp[1]=midkey2[1];
temp[2]=midkey2[28];
temp[3]=midkey2[29];
if(movebit==2){
for(i=0;i<26;i++){
midkey2[i]=midkey2[i+2];
midkey2[i+28]=midkey2[i+30];
}
midkey2[26]=temp[0];midkey2[27]=temp[1];
midkey2[54]=temp[2];midkey2[55]=temp[3]; }
else
{ for(i=0;i<27;i++){
midkey2[i]=midkey2[i+1];
midkey2[i+28]=midkey2[i+29];
}
midkey2[27]=temp[0];midkey2[55]=temp[2];
}
for(i=0;i<48;i++)
key[n][i]=midkey2[PC2[i]-1];
}
void EncodeData(int *lData,int *rData,int *str){ //encodedata function
int i,j,temp[8],lint,rint;//int h;
int data[64];
lint=0,rint=0;
for(i=0;i<4;i++){
j=0;
while(str[i]!=0){
temp[j]=str[i]%2;
str[i]=str[i]/2;
j++;
}
while(j<8)temp[j++]=0;
for(j=0;j<8;j++)
lData[lint++]=temp[7-j];
j=0;
while(str[i+4]!=0){
temp[j]=str[i+4]%2;
str[i+4]=str[i+4]/2;
j++;
}
while(j<8)temp[j++]=0;
for(j=0;j<8;j++)rData[rint++]=temp[7-j];
}
for(i=0;i<32;i++){
data[i]=lData[i];
data[i+32]=rData[i];
}
for(i=0;i<32;i++){
lData[i]=data[IP1[i]-1];//printf("P1:%5d:%5d,%5d\n",IP1[i],lData[i],data[IP1[i]-1]);
rData[i]=data[IP1[i+32]-1];
}
}
void F(int *rData,int *key){ //F function
int i,rDataP[48];
Expand(rData,rDataP);
for(i=0;i<48;i++){
rDataP[i]=rDataP[i]^key[i];// printf("%10d",rDataP[i]);if((i+1)%6==0)printf("\n");
}
ExchangeS(rDataP,rData);
ExchangeP(rData);
}
void Expand(int *rData,int *rDataP){ //Expand function
int i;
for(i=0;i<48;i++)
rDataP[i]=rData[Ex[i]-1];
}
void ExchangeS(int *rDataP,int *rData){ //S-diagram change
int i,n,linex,liney;
linex=liney=0;
for(i=0;i<48;i+=6){
n=i/6; //printf("%10d\n",(rDataP[i]<<1));
linex=(rDataP[i]<<1)+rDataP[i+5];
liney=(rDataP[i+1]<<3)+(rDataP[i+2]<<2)+(rDataP[i+3]<<1)+rDataP[i+4];
FillBin(rData,n,s[n][linex][liney]);
}
}
void ExchangeP(int *rData){ //P change
int i,temp[32];
for(i=0;i<32;i++)
temp[i]=rData[i];
for(i=0;i<32;i++)
rData[i]=temp[P[i]-1];
}
void FillBin(int *rData,int n,int s){ // data to binary;call by S-Diagram change function
int temp[4],i;
for(i=0;i<4;i++){
temp[i]=s%2;
s=s/2;
}
for(i=0;i<4;i++)
rData[n*4+i]=temp[3-i];
}
void DecodeData(int *str,int *lData,int *rData){ //DecodeData from binary
int i;int a,b;int data[64];
a=0,b=0;
for(i=0;i<32;i++){
data[i]=lData[i];
data[i+32]=rData[i];
}
for(i=0;i<32;i++){
lData[i]=data[IP2[i]-1];
rData[i]=data[IP2[i+32]-1];
}
for(i=0;i<32;i++){
a=(lData[i]&0x1)+(a<<1);
b=(rData[i]&0x1)+(b<<1);
if((i+1)%8==0){
str[i/8]=a;a=0;//printf("%d",i/8);
str[i/8+4]=b;b=0;//printf("%d",i/8+4);
}
}
}
void Encode(int *str,int *keychar){ //encode: input 8 chars,8 keychars
int lData[32],rData[32],temp[32],rDataP[48];
int i,j;
keyBuild(keychar);
EncodeData(lData,rData,str);
for(i=0;i<16;i++){
for(j=0;j<32;j++)
temp[j]=rData[j];
F(rData,key[i]);
for(j=0;j<32;j++){
rData[j]=rData[j]^lData[j];
}
for(j=0;j<32;j++)
lData[j]=temp[j];
}
DecodeData(str,rData,lData);
}
void Decode(int *str,int *keychar){ //decode :input 8 chars,8 keychars
int lData[32],rData[32],temp[32],rDataP[48];
int i,j;
keyBuild(keychar);
EncodeData(lData,rData,str); //这个位置
for(i=0;i<16;i++){
for(j=0;j<32;j++)
temp[j]=rData[j];
F(rData,key[15-i]);
for(j=0;j<32;j++){
rData[j]=rData[j]^lData[j];
}
for(j=0;j<32;j++){
lData[j]=temp[j];
}
}
DecodeData(str,rData,lData);
}
OK了
如果还有问题
给我发站内信
http://hi.baidu.com/gaojinshan/blog/item/b2a73d1f41631ff0e0fe0bfd.html
DES算法的介绍与实现
http://hi.baidu.com/gaojinshan/blog/item/8b2710c4ece4b3ce39db49e9.html
DES算法的源代码
1、 程序源文件
//作者：高金山
//日期：2004年3月
//说明：本文件包含了DES加密解密的函数。
//循环移位表,PC-1表,PC-2表,IP表,IP-1表,
//E扩展表,P变换表,S盒等都可以自己设置
#define g_RUN_ON_PC//pc上运行的标志
#ifndef g_RUN_ON_PC
#include "release.h"
#else
#include "stdlib.h"
#define bmalloc malloc
#endif
#include "gjsDES.h"
void xTran(unsigned char q[8],unsigned char p[8],unsigned char xTab[],int xLen)
{//根据置换表xTab将64位q转换成p
int i,qt,pt,tt;//qt,pt分别表示q,p的第几个字节,tt暂存
for(i=0;i<8;i++)
p[i]=0;//先清零
for(i=0;i
pt=i/8;
qt=(xTab[i]-1)/8;
tt=q[qt] << ((xTab[i]-1) % 8);
tt=tt & 0x80;//1000 0000
tt=tt >> (i % 8);
p[pt]=p[pt] | tt;
}
}
void genKey(unsigned char *key,unsigned char nkey[16][8])
{//由初始密钥okey生成16个子密钥nkey
unsigned char movebit[16]={//循环移位表。
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
unsigned char pc_1[56]={//PC-1置换。
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};
unsigned char pc_2[48]={//PC-2置换。
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};
unsigned char tkey[8],tt[8];//暂存64字节
unsigned long key_c,key_d; //前28位,后28位
int i=0,j=0;
for(i=0;i<8;i++) tkey[i]=0;
i=0;//strcpy(tkey,key);
while((*(key+i)!='\0')&&(i<8))
{ tkey[i]=*(key+i);i++; }
xTran(tkey,tt,pc_1,56); //PC-1置换
key_c=(*(tt+0)<<24)+(*(tt+1)<<16)+(*(tt+2)<<8)+(*(tt+3));
key_c=key_c & 0xfffffff0;//将前28位移入key_c的高28位
key_d=(*(tt+3)<<24)+(*(tt+4)<<16)+(*(tt+5)<<8)+(*(tt+6));
key_d=key_d & 0x0fffffff;//将后28位移入key_d低28位
for(i=0;i<16;i++)
{ //移位以得到各个子密钥
//根据移位表对c,d进行循环左移
key_c=(key_c<
key_d=((key_d<
for(j=0;j<8;j++)
tt[j]=0;//清零
*(tt+0)=key_c>>24;*(tt+1)=key_c>>16;
*(tt+2)=key_c>>8;*(tt+3)=key_c;//合并c到tt
*(tt+3)|=(key_d>>24);*(tt+4)=key_d>>16;
*(tt+5)=key_d>>8;*(tt+6)=key_d;//合并d到tt
xTran(tt,nkey[i],pc_2,48);//PC-2置换
}
}//生产子密钥结束
void sReplace(unsigned char right_s[8])
{//查找S盒，把扩展成48位的数据，替换成32位的数据
unsigned char p[32]={//P置换。
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 } ;
unsigned char s[][4][16] =
{{//S盒1。 S盒都可以自己设置
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 },
{//S盒2
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 },
{//S盒3
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 },
{//S盒4
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 },
{ //S盒5
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 },
{//S盒6
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 },
{//S盒7
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 },
{//S盒8
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 }};
unsigned char row,col,tmp_s[8]={0,0,0,0,0,0,0,0};
unsigned short tt;
int i=0;
for(i=0;i<=7;i++)
{//从S盒中取数
row=0,col=0;tt=0;
tt=((right_s[i*6/8]<<8) + (right_s[i*6/8+1])) >> (10-i*6 % 8);//取六位放到tt低6位
row=(row | ((tt>>5) & 0x01)) << 1;//取6位的第0位付给row的6位
row=(row | ((tt>>0) & 0x01)) << 0;//取6位的第5位付给row的7位
col=(tt >> 1) & 0x0f;//取6位的第1,2,3,4位付给row的低四位
//根据行和列的值从S盒中取数
tmp_s[i/2]=tmp_s[i/2]|s[i][row][col]<<4*((i+1)%2);
} //s_out[0-3]:???????? ???????? ???????? ???????? 00000000...
xTran(tmp_s,right_s,p,32); //P置换
}//S代替的结束
#define g_ENCRYPT_FLAG 1
#define g_DECRYPT_FLAG 2
unsigned char comDES(unsigned char in[8],unsigned char out[8],
unsigned char subkey[16][8],unsigned char flg)
{//单重DES加解密的公共函数 in输入数据 key密钥 out输出数据
unsigned char ip[64]={////IP置换。
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 };
unsigned char ip_1[64]={//IP-1置换。可根据IP表生成
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 };
unsigned char e[48] ={//E扩展。
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};
unsigned char left[8],right[8],temp[8];//数据的左32位,右32位,暂存
int i=0,j=0,k=0;
xTran(in,temp,ip,64); //IP置换
for(i=0;i<=3;i++) left[i]=temp[i] ;//将明文左32位放到left中
for(i=4;i<=7;i++) right[i-4]=temp[i] ;//将明文右32位放到right中
for(i=0;i<16;i++)
{//16层循环
if(flg==g_ENCRYPT_FLAG) k=i;
else if(flg==g_DECRYPT_FLAG) k=15-i;
else return 0;
for(j=0;j<=3;j++)
{
temp[j]=left[j];//将left暂存起来
left[j]=right[j];//L(n) = R(n-1)
}
xTran(left,right,e,48);//对right进行E扩展
for(j=0;j<6;j++)
right[j]=right[j]^subkey[k][j];//48位的数据右部与密钥异或
sReplace(right) ;//将48位的right变为32位
for(j=0;j<=3;j++)
{//获得下一个right
right[j]=temp[j] ^ right[j] ;//f(R(n-1),k)
}
}
for(i=0;i<4;i++) temp[i]=right[i]; //合并right和left到temp(64位)
for(i=4;i<8;i++) temp[i]=left[i-4];//右边左边互换,因为最后一次不用交换
//for(i=0;i<64;i++) ip_1[ip[i]-1]=i+1;//生成IP-1置换表
xTran(temp,out,ip_1,64);//IP-1置换
return 1;
}//单重DES加解密结束
//=======================================DES====================================
unsigned char enDES(unsigned char* indata,unsigned long inlen,unsigned char* key,\
unsigned char* outdata,unsigned long* outlen)
{//加密
unsigned char *p,*p1,s_key[16][8],tt[8];
long tlen=0,i=0,ttlen=0;
if((indata==NULL)||(outdata==NULL)||(key==NULL)
||(outlen==NULL)||(inlen<=0)||(*outlen
p=indata;
tlen=inlen/8;
if(inlen%8!=0)
tlen=tlen+1;
tlen=tlen*8;//补整
*outlen=tlen;//密文长度
p1=outdata;tlen=inlen;
for(i=0;i<8;i++) tt[i]=0;
genKey(key,s_key);//获取16个子密钥
while(tlen>0)
{//逐64位循环加密
for(i=0;i<8;i++) tt[i]=0;
ttlen=(tlen<8)?tlen:8;
for(i=0;i
comDES(tt,p1,s_key,g_ENCRYPT_FLAG);
p=p+8;p1=p1+8;tlen=tlen-8;
}
return 1;
}
unsigned char unDES(unsigned char* indata,unsigned long inlen,unsigned char* key,\
unsigned char* outdata,unsigned long* outlen)
{//解密
unsigned char *p,*p1,s_key[16][8],tt[8];
long tlen=0,i=0,ttlen=0;
if((indata==NULL)||(outdata==NULL)||(key==NULL)
||(outlen==NULL)||(inlen<=0)||(*outlen
p=indata;
tlen=inlen/8;
if(inlen%8!=0)
tlen=tlen+1;
tlen=tlen*8;//补整
*outlen=tlen;//明文长度
p1=outdata;tlen=inlen;
for(i=0;i<8;i++) tt[i]=0;
genKey(key,s_key);//获取16个子密钥
while(tlen>0)
{//逐64位循环解密
for(i=0;i<8;i++) tt[i]=0;
ttlen=(tlen<8)?tlen:8;
for(i=0;i
comDES(tt,p1,s_key,g_DECRYPT_FLAG);
p=p+8;p1=p1+8;tlen=tlen-8;
}
return 1;
}
//================随机生成密钥========================
void randKey(unsigned char key[8])
{//根随机生成一个64位(8字节)的密钥
unsigned char i;
for(i=0;i<8;i++)
key[i]=rand() % 0x0100;
};
//==============DES-CBC============================================================
unsigned char enDES_cbc(unsigned char* indata,unsigned long inlen,unsigned char* key,\
unsigned char* outdata,unsigned long* outlen,unsigned char* iv)
{//DES-CBC加密
unsigned char *p,*p1,s_key[16][8],tt[8],ivt[8];
long tlen=0,i=0,ttlen=0;
if((indata==NULL)||(outdata==NULL)||(key==NULL)||(iv==NULL)
||(outlen==NULL)||(inlen<=0)||(*outlen
for(i=0;i<8;i++)
ivt[i]=iv[i];
p=indata;
tlen=inlen/8;
if(inlen%8!=0)
tlen=tlen+1;
tlen=tlen*8;//补整
*outlen=tlen;//密文长度
p1=outdata;tlen=inlen;
for(i=0;i<8;i++) tt[i]=0;
genKey(key,s_key);//获取16个子密钥
while(tlen>0)
{//逐64位循环加密
for(i=0;i<8;i++) tt[i]=0;
ttlen=(tlen<8)?tlen:8;
for(i=0;i
for(i=0;i<8;i++)//与iv异或
tt[i]=tt[i] ^ ivt[i];
comDES(tt,p1,s_key,g_ENCRYPT_FLAG);
for(i=0;i<8;i++)
ivt[i]=p1[i];
p=p+8;p1=p1+8;tlen=tlen-8;
}
return 1;
}
unsigned char unDES_cbc(unsigned char* indata,unsigned long inlen,unsigned char* key,\
unsigned char* outdata,unsigned long* outlen,unsigned char* iv)
{//DES-CBC解密
unsigned char *p,*p1,s_key[16][8],tt[8],ivt[8];
long tlen=0,i=0,ttlen=0;
if((indata==NULL)||(outdata==NULL)||(key==NULL)||(iv==NULL)
||(outlen==NULL)||(inlen<=0)||(*outlen
for(i=0;i<8;i++)
ivt[i]=iv[i];
p=indata;
tlen=inlen/8;
if(inlen%8!=0)
tlen=tlen+1;
tlen=tlen*8;//补整
*outlen=tlen;//明文长度
p1=outdata;tlen=inlen;
for(i=0;i<8;i++) tt[i]=0;
genKey(key,s_key);//获取16个子密钥
while(tlen>0)
{//逐64位循环解密
for(i=0;i<8;i++) tt[i]=0;
ttlen=(tlen<8)?tlen:8;
for(i=0;i
comDES(tt,p1,s_key,g_DECRYPT_FLAG);
for(i=0;i<8;i++)//与iv异或
p1[i]=p1[i] ^ ivt[i];
for(i=0;i<8;i++)
ivt[i]=tt[i];
p=p+8;p1=p1+8;tlen=tlen-8;
}
return 1;
}
unsigned char enY5DES(gYan5DES* y5)
{//研五DES加密
int flag=0;
if((y5==NULL)||(y5->len>g_YAN5_DES_LEN)
||(y5->len==0)||(y5->len%8!=0))
return 0;//传入参数错误
flag=enDES(y5->indata,y5->len,y5->key,y5->outdata,&(y5->len));
if(flag) return 1;
else return 0;
}
unsigned char unY5DES(gYan5DES* y5)
{//研五DES解密
int flag=0;
if((y5==NULL)||(y5->len>g_YAN5_DES_LEN)
||(y5->len==0)||(y5->len%8!=0))
return 0;//传入参数错误
flag=unDES(y5->indata,y5->len,y5->key,y5->outdata,&(y5->len));
if(flag) return 1;
else return 0;
}
void clrYan5DES(gYan5DES* y5)
{//清空结构
int i=0;
if(y5==NULL) return;
for(i=0;i
y5->indata[i]=0;
y5->outdata[i]=0;
}
for(i=0;i<8;i++)
y5->key[i]=0;
y5->len=0;
}
2、 程序头文件
#ifndef _GJS_DES_H
#define _GJS_DES_H
//====================研5专用接口=======================
#define g_YAN5_DES_LEN 128
typedef struct g_Yan5DES
{//研五加解密专用结构
unsigned char indata[g_YAN5_DES_LEN];
unsigned char outdata[g_YAN5_DES_LEN];
unsigned char key[8];
unsigned long len;
} gYan5DES;
unsigned char enY5DES(gYan5DES* y5);//加密
unsigned char unY5DES(gYan5DES* y5);//解密
void clrYan5DES(gYan5DES* y5);
//====================CBC-DES和ECB-DES接口=====================
unsigned char enDES_cbc(unsigned char* indata,unsigned long inlen,unsigned char key[8],\
unsigned char* outdata,unsigned long* outlen,unsigned char* iv);//加密
unsigned char unDES_cbc(unsigned char* indata,unsigned long inlen,unsigned char key[8],\
unsigned char* outdata,unsigned long* outlen,unsigned char* iv);//解密
unsigned char enDES(unsigned char* indata,unsigned long inlen,unsigned char key[8],\
unsigned char* outdata,unsigned long* outlen);//加密
unsigned char unDES(unsigned char* indata,unsigned long inlen,unsigned char key[8],\
unsigned char* outdata,unsigned long* outlen);//解密
void randKey(unsigned char key[8]);//生成随机密钥
//====================以下函数自己调用========================
//加解密的公共函数
unsigned char comDES(unsigned char in[8],unsigned char out[8],\
unsigned char subkey[16][8],unsigned char flg);
//生成16个子密钥(48位有效)
void genKey(unsigned char*,unsigned char[16][8]);
//S盒代替和P置换(48位->32位)
void sReplace(unsigned char*) ;
#endif
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