密码学实验三DES算法的实现文档格式.docx
- 文档编号:21202647
- 上传时间:2023-01-28
- 格式:DOCX
- 页数:28
- 大小:134.63KB
密码学实验三DES算法的实现文档格式.docx
《密码学实验三DES算法的实现文档格式.docx》由会员分享,可在线阅读,更多相关《密码学实验三DES算法的实现文档格式.docx(28页珍藏版)》请在冰豆网上搜索。
if(_length>
8)
{
return;
}
for(inti=0;
i<
_length;
i++)
msg[i]=_msg[i];
//转换成二进制
Char2Bit(msg,bmsg,8);
};
2.输入密钥:
SetKey(char*_key,int_length)
key[i]=_key[i];
//转成二进制
Char2Bit(key,bkey,8);
3.各种置换:
InitSwap(boolin[64])
//打乱
32;
lmsgi[i]=in[ip[i]-1];
rmsgi[i]=in[ip[i+32]-1];
//
//初始逆置换函数
voidDES:
InitReSwap(boolout[64])
//组合成64数组
booltemp[64];
temp[i]=rmsgi[i];
temp[32+i]=lmsgi[i];
//按照逆ip矩阵
64;
out[i]=temp[back_ip[i]-1];
SubKeyOff(bool*_subkey,int_off)
booltemp;
_off;
temp=_subkey[0];
for(inti=0;
27;
{
_subkey[i]=_subkey[i+1];
}
_subkey[27]=temp;
4.S盒处理:
DealSBox(boolin[48],boolout[32])
bool_in[6],_out[4];
//8个盒子
8;
//提取盒子
for(intj=0;
j<
6;
j++)
_in[j]=in[i*6+j];
//压缩
_DealSBox(_in,_out,i);
//放进out数组
for(intjj=0;
jj<
4;
jj++)
out[i*4+jj]=_out[jj];
5.加密函数:
CrypteFunction(boolin[32],intisubkey,boolout[32])
//e操作
booltemp1[48];
EOperation(in,temp1);
booltemp2[48];
Mode2Add(temp1,(bool*)subkey[isubkey],temp2,48);
//ok
//盒子压缩
booltemp3[48];
DealSBox(temp2,temp3);
//置换运算p
POperation(temp3,out);
6.解密函数:
Decipher()
booltemp1[32],temp2[32];
//初始置换ip
InitSwap(bcryptedmsg);
//16轮迭代加密
16;
if(i%2==0)
//L1=R0
CopyArray(rmsgi,lmsgi1,32);
//f(R0,k0)
CrypteFunction(rmsgi,15-i,temp1);
//L0+f(R0,k0)
Mode2Add(lmsgi,temp1,temp2,32);
//R1=L0+f(R0,k0)
CopyArray(temp2,rmsgi1,32);
else
//L2=R1
CopyArray(rmsgi1,lmsgi,32);
//f(R1,k1)
CrypteFunction(rmsgi1,15-i,temp1);
//L1+f(R1,k1)
Mode2Add(lmsgi1,temp1,temp2,32);
//R2=L1+f(R1,k1)
CopyArray(temp2,rmsgi,32);
//逆初始置换ip
InitReSwap(bdecipher);
//转成字符
Bit2Char(bdecipher,decipher);
四、软件使用说明(开发环境、参数使用详细说明、实验结果+相应截图等)
【开发环境】
MicrosoftVisualStudio2015
MicrosoftWindows10
【参数使用】
char*msg;
char*key;
【实验结果】
实验数据:
六、参考资料(书籍或网络文章)
《密码编码学与网络安全——原理与实践(第五版)》
XX
七、实验心得和总结
做这次DES加解密实验前首先要充分了解其原理,在这个实验中,比较难的就是,要将明文和密钥经过初始变换和十六轮加密变换等一系列变换后才能得到置换,其中的变换步骤比较多,而且比较复杂,还要将十六进制转化为二进制,工作量比较大。
附:
程序源代码
#include"
stdafx.h"
#include<
iostream>
string.h>
usingnamespacestd;
classDES
private:
//明文
charmsg[8];
boolbmsg[64];
//密钥
charkey[8];
boolbkey[64];
//16个子密钥
boolsubkey[16][48];
//l0r0中间变量
boolrmsgi[32],lmsgi[32];
//第i个
boolrmsgi1[32],lmsgi1[32];
//第i+1个
//密文
boolbcryptedmsg[64];
charcryptedmsg[8];
//解密的结果
boolbdecipher[64];
chardecipher[8];
//静态常量
//不允许在类内初始化
//初始值换ip
conststaticintip[64];
//子密钥
//置换选择1
conststaticintc0[28];
conststaticintd0[28];
//循环左移表
conststaticintkeyoff[16];
//置换选择2
conststaticintdi[48];
//加密函数
//e运算
conststaticinte_operate[48];
//sbox
conststaticintsbox[8][64];
conststaticintp_operate[32];
conststaticintback_ip[64];
//位掩码
conststaticcharbitmask[8];
public:
//设置明文和密钥
//_length要小于或等于8
voidSetMsg(char*_msg,int_length);
voidSetKey(char*_msg,int_length);
//生产子密钥
voidProduceSubKey();
//总的的加密流程
voidCrypte();
//解密
voidDecipher();
//输出密文
voidOutPutCryptedMsg();
//二进制转成字符
voidBit2Char(bool*_barray,char*_carray);
//length=64
//输出解密后的明文
voidOutPutDecipher();
//字符转成二进制,并保存到64位bool数组中
voidChar2Bit(char*_carray,bool*_barray,intlength);
////二进制转成字符
//voidBit2Char(bool*_barray,char*_carray);
//初始置换
voidInitSwap(boolin[64]);
//初始逆置换
voidInitReSwap(boolout[64]);
//循环左移
voidSubKeyOff(bool*_subkey,int_off);
//e运算操作函数
voidEOperation(boola[32],boolb[48]);
//模2相加
//相同为0不同为1
voidMode2Add(boola[],boolb[],boolc[],intlength);
voidDealSBox(boolin[48],boolout[32]);
void_DealSBox(boolin[6],boolout[4],intbox);
//popraration
voidPOperation(booltemp[32],boolresult[32]);
voidCrypteFunction(boolin[32],intisubkey,boolout[32]);
//数组之间赋值
voidCopyArray(boolarray1[],boolarray2[],intsize);
//静态常量
constintDES:
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
c0[28]={
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
d0[28]={
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
keyoff[16]={
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
di[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
e_operate[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
sbox[8][64]={
14,4,13,1,1,15,11,8,3,10,6,12,5,9,0,7,
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
13,2,8,4,6,15,11,1,10,9,13,14,5,0,12,7,
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
p_operate[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
back_ip[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
constcharDES:
bitmask[8]={128,64,32,16,8,4,2,1};
//实现函数
//设置明文
//设置密钥
//字符转成二进制
Char2Bit(char*_carray,bool*_barray,intlength)
//intindex=0;
length;
_barray[i*8+7-j]=(_carray[i]>
>
j)&
1;
//二进制转成字符
Bit2Char(bool*_barray,char*_carray)
chartemp;
//数学方法转成字符
temp=0;
if(_barray[i*8+j]==1)
{
temp|=bitmask[j];
}
//cout<
<
temp;
_carr
- 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:
- 密码学 实验 DES 算法 实现
![提示](https://static.bdocx.com/images/bang_tan.gif)