desdlg.cpp

用VC做的数据加密标准DES算法可视化实现.简单易懂,有密码学和C或C++基础即可理解

// DESDlg.cpp : implementation file
//

#include "stdafx.h"
#include "DES.h"
#include "DESDlg.h"
#include <stdio.h> 
#include <string.h> 
#include <windows.h> 




#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/**********此处定义DES的置换表、DES的S盒、以及DES密钥的使用(置换选择表)***********/
/**********定义DES的置换表********/


//初使转换(Initial Permutation IP)
DWORDLONG dwlData_IP[65]={ 
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, 
63,55,47,39,31,23,15,7,0}; 

//逆初始转换(Inverse Initial Permutation IP-1)
DWORDLONG dwlData_FP[65]={ 
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, 
33,1,41,9,49,17,57,25,0};

//扩充置换(Expansion Permutation(E))
DWORDLONG dwlData_Expansion[64]={ 
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, 
28,29,30,31,32,1,0};
 
//置换函数(Permutation Function (P))
DWORDLONG dwlData_P[33]={ 
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, 4,25,0}; 


/*******DES密钥的使用)*********/

//选择置换1 (PC-1)
DWORDLONG subKey_PC_1[64]={ 
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, 
21,13,5,28,20,12,4,0}; 

//选择置换2 (PC-2)
DWORDLONG subKey_PC_2[57]={ 
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,
34,53,46,42,50,36,29,32,0};
 

/******DES的S盒的定义 (Definition of DES S-Boxes)******/
DWORDLONG OS[512]={
/*S1*/
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, 
/*S2*/
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, 
/*S3*/
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, 
/*S4*/
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, 
/*S5*/
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, 
/*S6*/
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, 
/*S7*/
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, 
/*S8*/
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 
}; 


/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDESDlg dialog

CDESDlg::CDESDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDESDlg::IDD, pParent)
{	m_subKey=0; 
	m_dwlData=0; 
	for(int i=0;i<16;i++)
		{ 
		  step[i]=2; 
	      mask[i]=0xc000000; //0xc000000为十六进制数,相当于28位二进制数:1100 0000 0000 0000 0000 0000 0000
		} 
		step[0]=step[1]=step[8]=step[15]=1; 
		mask[0]=mask[1]=mask[8]=mask[15]=0x8000000; //0x8000000 相当于(1000 0000 0000 0000 0000 0000 0000)
	ConvertTableToMask(subKey_PC_1,64); 
	ConvertTableToMask(subKey_PC_2,56); 
	ConvertTableToMask(dwlData_IP,64); 
	ConvertTableToMask(dwlData_Expansion,32); 
	ConvertTableToMask(dwlData_FP,64); 
	ConvertTableToMask(dwlData_P,32); 
	Generate_S(); 
	//{{AFX_DATA_INIT(CDESDlg)
	m_strData = _T("");
	m_strKey = _T("");
	m_strOutput = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

//以下为各成员函数的实现
 
//密钥产生
void CDESDlg::EncryptKey(char *key){ 


m_subKey=Char_to_Byte((unsigned char*)key,TRUE);  
m_subKey=Permutation(m_subKey,subKey_PC_1,56); 
Generate_K(); 

} 

//子密钥Ki的产生(注:ki作为函数F(Ri-1,Ki)的输入)
void CDESDlg::Generate_K(void){ 

DWORDLONG C[17],D[17],tmp; 
//由置换选择1(PC-1)所得的56位密钥(m_subKey)分为两个28位数据C[0]和D[0]
C[0]=m_subKey>>28; //将m_subKey各二进制位右移28位,移到右端的低位舍去,高位补0,这样就取得左端的28位数据赋给C[0]
D[0]=m_subKey&0xfffffff;//与0xfffffff按位与运算,取得m_subKey的右端(低)28位,其它位清零.
//以下为C[i-1]和D[i-1]每轮循环左移
for(int i=1;i<=16;i++){ 
	tmp=(C[i-1]&mask[i-1])>>(28-step[i-1]); //tmp保存左移1位或2位时溢出左端的数据
	C[i]=((C[i-1]<<step[i-1])|tmp)&0x0fffffff;  
/*C[i-1]的其它不溢的位左移并与tmp按位或运算,使得溢出的数据补在C[i-1]右端,以实现循环左移*/

	tmp=(D[i-1]&mask[i-1])>>(28-step[i-1]); 
	D[i]=((D[i-1]<<step[i-1])|tmp)&0x0fffffff; 
	m_dwl_K[i]=(C[i]<<28)|D[i]; //移位后的值为m_dwl_K[i]
	m_dwl_K[i]=Permutation(m_dwl_K[i],subKey_PC_2,48);//m_dwl_K[i]作为置换选择2(PC-2)输入,产生48位子密钥 
	} 
}

 
//字符转换函数：长度为8字节的(密钥、明文、密文)转换为64位二进制数
DWORDLONG CDESDlg::Char_to_Byte(unsigned char *key,BOOL shift){ 

unsigned char tmp; 
DWORDLONG byte=0;  
int i=0; 

while(i<8)
{ 
	while(*key){ 
		if(byte!=0) byte<<=8; 
		tmp=*key;			//每次循环把key中的1个字节(8位)赋给tmp
		if(shift) tmp<<=1;	//tmp的二进制数左移1位后再赋给tmp,
		byte|=tmp;			//tmp与byte按位或运算再赋给byte
		i++; 
		key++; 
		} 
	if(i<8) 
	byte<<=8; 
	i++; 
} 
return byte; 
} 

//置换函数：可用来对中间数据或子密钥的进行各种置换选择
DWORDLONG CDESDlg::Permutation(DWORDLONG dwlPara,DWORDLONG* dwlTable,int Len){ 

int i=0; 
DWORDLONG tmp=0,moveBit; 

while(i<Len){ 
moveBit=1; 
if(dwlTable[i]&dwlPara){ 
moveBit<<=Len-i-1; 
tmp|=moveBit; 
} 
i++; 
} 
return tmp; 
} 

void CDESDlg::ConvertTableToMask(DWORDLONG *mask,int max){ 

int i=0; 
DWORDLONG nBit=1; 

while(mask[i]!=0){ 
nBit=1; 
nBit<<=max-mask[i]; 
mask[i++]=nBit; 
} 
} 

//S盒的产生
void CDESDlg::Generate_S(void){ 

 int i; 
 int j,m,n; 
 m=n=0; 
 j=1; 
 for(i=0;i<512;i++)
	{ 
	   Des_S[j][m][n]=OS[i]; 
	   n=(n+1)%16; 
       if(!n)