DES算法的C语言代码及实现.docx
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DES算法的C语言代码及实现
DES算法的C语言代码及实现
首先新建头文件des_encode.H
内容如下：
voidEncodeMain（）;//EncodeMainfunction
voidDecodeMain（）;//Sorry,ithasnotused
voidDecode（int*str,int*keychar）;//decode:
input8chars,8keychars
voidEncode（int*str,int*keychar）;//encode:
input8chars,8keychars
voidkeyBuild（int*keychar）;//createkeyarray
voidStrtoBin（int*midkey,int*keychar）;//changeintobinary
voidkeyCreate（int*midkey2,intmovebit,inti）;//callbykeyBuild
voidEncodeData（int*lData,int*rData,int*srt）;//encodedatafunction
voidF（int*rData,int*key）;//Ffunction
voidExpand（int*rData,int*rDataP）;//Expandfunction
voidExchangeS（int*rDataP,int*rData）;//S-diagramchange
voidExchangeP（int*rData）;//Pchange
voidFillBin（int*rData,intn,ints）;//datatobinary;callbyS-Diagramchangefunction
voidDecodeData（int*str,int*lData,int*rData）;//DecodeDatafrombinary
intIP1[]={58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,//initialchange
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,
};
intIP2[]={40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,//oppinitialchange
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
};
ints[][4][16]={{//S-diagramarray
{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}
}
};
intEx[48]={32,1,2,3,4,5,//Expandarray
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
};
intP[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
};
intPC1[56]={57,49,41,33,25,17,9,//PC-1inkeyBuild
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
};
intPC2[48]={14,17,11,24,1,5,//PC-2inkeyBuild
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"
intkey[16][48];
charstr[8];
voidmain（）//mainfunction
{
EncodeMain（）;
}
voidEncodeMain（）//EncodeMainfunction
{
inti;
charkeychar[8];
intkey2[8];
intstrkey[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"）;
}
voidkeyBuild（int*keychar）{//createkeyarray
inti,j;
intmovebit[]={1,1,2,2,2,2,2,2,
1,2,2,2,2,2,2,1};
intmidkey2[56];
intmidkey[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）;
}
voidStrtoBin（int*midkey,int*keychar）{//changeintobinary
inttrans[8],i,j,k,n;
n=0;
for（i=0;i<8;i++）{
j=0;
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