谁可以给我一个c语言写的DES代码,要求(输入任意一个字符串,可以得到相应的密文)

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 binarycall 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<stdio.h>

#include<string.h>

#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=0i<8i++)

scanf("%c",&str[i])

getchar()

for(i=0i<8i++)

strkey[i]=str[i]

printf("\n输入明文的十六进制为:\n")

for(i=0i<8i++)

printf("%10x",strkey[i])

printf("\n请输入密钥(8个字符):\n")

for(i=0i<8i++)

scanf("%c",&keychar[i])

for(i=0i<8i++)

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=0i<8i++)

printf("%10x",strkey[i])

printf("\n\n清输入解密密码\n")

for(i=0i<8i++)

scanf("%c",&keychar[i])

for(i=0i<8i++)

key2[i]=keychar[i]

Decode(strkey,key2)

for(i=0i<8i++)

printf("%10x",strkey[i])

for(i=0i<8i++)

str[i]=strkey[i]

printf("\n明文为：\t")

for(i=0i<8i++)

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=0i<56i++)

midkey2[i]=midkey[PC1[i]-1]

for(i=0i<16i++)

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=0i<8i++){

j=0

while(keychar[i]!=0){

trans[j]=keychar[i]%2

keychar[i]=keychar[i]/2

j++

}

for(k=jk<8k++)trans[k]=0

for(k=0k<8k++)

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=0i<26i++){

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=0i<27i++){

midkey2[i]=midkey2[i+1]

midkey2[i+28]=midkey2[i+29]

}

midkey2[27]=temp[0]midkey2[55]=temp[2]

}

for(i=0i<48i++)

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=0i<4i++){

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=0j<8j++)

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=0j<8j++)rData[rint++]=temp[7-j]

}

for(i=0i<32i++){

data[i]=lData[i]

data[i+32]=rData[i]

}

for(i=0i<32i++){

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=0i<48i++){

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=0i<48i++)

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=0i<48i+=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=0i<32i++)

temp[i]=rData[i]

for(i=0i<32i++)

rData[i]=temp[P[i]-1]

}

void FillBin(int *rData,int n,int s){ // data to binarycall by S-Diagram change function

int temp[4],i

for(i=0i<4i++){

temp[i]=s%2

s=s/2

}

for(i=0i<4i++)

rData[n*4+i]=temp[3-i]

}

void DecodeData(int *str,int *lData,int *rData){//DecodeData from binary

int iint a,bint data[64]

a=0,b=0

for(i=0i<32i++){

data[i]=lData[i]

data[i+32]=rData[i]

}

for(i=0i<32i++){

lData[i]=data[IP2[i]-1]

rData[i]=data[IP2[i+32]-1]

}

for(i=0i<32i++){

a=(lData[i]&0x1)+(a<<1)

b=(rData[i]&0x1)+(b<<1)

if((i+1)%8==0){

str[i/8]=aa=0//printf("%d",i/8)

str[i/8+4]=bb=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=0i<16i++){

for(j=0j<32j++)

temp[j]=rData[j]

F(rData,key[i])

for(j=0j<32j++){

rData[j]=rData[j]^lData[j]

}

for(j=0j<32j++)

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=0i<16i++){

for(j=0j<32j++)

temp[j]=rData[j]

F(rData,key[15-i])

for(j=0j<32j++){

rData[j]=rData[j]^lData[j]

}

for(j=0j<32j++){

lData[j]=temp[j]

}

}

DecodeData(str,rData,lData)

}

OK了

如果还有问题

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在C#中直接引用加密类库比在C中要方便和快速     des_demo cs代码如下

 using Systemusing System Security Cryptographyusing System IOusing System Textpublic class EncryptStringDES { public static void Main(String[] args) { if (args Length <) { Console WriteLine( Usage: des_demo <string to encrypt>args[ ])return}     // 使用UTF 函数加密输入参数

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