DES加密算法代码.docx
- 文档编号:436301
- 上传时间:2022-10-10
- 格式:DOCX
- 页数:17
- 大小:20.16KB
DES加密算法代码.docx
《DES加密算法代码.docx》由会员分享,可在线阅读,更多相关《DES加密算法代码.docx(17页珍藏版)》请在冰豆网上搜索。
DES加密算法代码
实验二DES加密算法
用C语言编写DES算法代码,代码如下:
#include
#include
//明文IP置换坐标
intDatalP[]={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};
charpreData[8];//
用户输入的明文
charpreKey[8];
//用户输入的密钥
intData64[64];〃8
个明文通过十进制转二进制得到的64bit明文
intKey64[64];//8
个密钥通过十进制转二进制得到的64bit密钥
intDataTemp[64];〃Data64[]
到L0和R0
通过IP置换得到的64bit明文,用于得
intL0[32],R0[32];
0的时候表示
intflagDorK=0;//标志位,如果是1的时候表示明文,
密文
//此段全局变量服务于段雪琦所写所用函数
〃PC_1置换坐标表
intPC_1[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_2置换坐标表
intPC_2[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};
//迭代左移位数数组
intlsi[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
//逆初始置换表IPA-1
intIP_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};
intKeyOutBox[48]={0};//输出的子密钥数组
intIsinumber=0;//用于记录是第i次加密,Isinumber等于i
//sherry第二个函数所用
//f操作中将R0扩展为48位的置换坐标表
intfExpand48[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,
24,25,26,27,28,29,
28,29,30,31,32,31};
〃P变换置换坐标表
intfPChange[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};
〃S盒置换坐标表
intsBox[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},
{0,14,4,11,10,4,13,1,5,8,12,6,9,3,2,15},
{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},
{10,6,9,0,12,11,7,8,15,9,12,5,6,3,0,14},
},
{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}
}
};
/*生成R0L0*
**将输入的分别为8个的明文和密钥转化为64bit的明文和密钥,**
**分别放入Data64[]和Key64[];**
**将生成的64bit的明文通过IP置换得到L0[]和R0[]
***/
voidROandLO(chartempData[8])
{
inti,j,temp,y;
intk=0;
inttempBox[64];
intmtemp=0;for(i=0;i<8;i++){
for(j=7;j>=0;j--)
{
temp=tempData[i]&(1< if(0==temp) { tempBox[k]=0; k++; } else tempBox[k]=1; k++; } } } //当flagDorK等于1时,为明文转化,生成L0和R0 if(flagDorK==1) { printf("转化为64bit明文\n"); for(y=0;y<64;y++) { Data64[y]=tempBox[y]; tempBox[y]=0; printf("%d",Data64[y]); if(y==7||y==15||y==23||y==39||y==47||y==55||y==63) { printf(""); } if(y==31) printf("\n"); for(y=0;y<64;y++) { DataTemp[y]=Data64[DatalP[y]-1]; if(y<32) { L0[y]=DataTemp[y]; } else { R0[y-32]=DataTemp[y]; } } \n"); printf("\n明文Data过IP置换后得到: printf("L0: "); for(i=0;i<32;i++) if(i==7||i==15||i==23||i==31) printf(""); } } printf("\nRO: "); for(i=0;i<32;i++) { printf("%d",RO[i]); if(i==7||i==15||i==23||i==31) { printf(""); } } printf("\n\n"); } Key64 //当flagDorK等于0时,为密钥转化,生成密钥 if(flagDorK==0) printf("转化为64bit的密钥\n"); for(y=0;y<64;y++) Key64[y]=tempBox[y]; tempBox[y]=0; printf("%d",Key64[y]); if(y==7||y==15||y==23||y==39||y==47||y==55||y==63){ printf(""); } if(y==31) { printf("\n"); } } printf("\n\n"); } } /*输入函数 ***/ voidInput(){ inti; for(i=0;i<8;i++) scanf("%c",&preData[i]); } flagDorK=1; ROandLO(preData); getchar(); printf("请输入密钥: \n"); for(i=0;i<8;i++) { scanf("%c",&preKey[i]); } flagDorK=0; R0andL0(preKey); } //IP逆置换 intDES」P_1_Transform(intdata[64]){ intent; inttemp[64]; for(cnt=0;cnt<64;cnt++){ temp[cnt]=data[IP_1
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- DES 加密算法 代码