基于VC的Ceasar加密和解密技术

基于VC的Ceasar加密和解密技术

一、Clear原理

对每一明文字母P，代换成密文字母C：

C=E(P)=(P+3) mod (26)

移位就可以是任意整数K，这样就得到了一般的Ceasar算法：

C=E(P)=(P+K) mod (26)

这里K的取值范围从1到25。解密算法是：

P=D(C)=(C-K)mod (26)

二、开发平台及语言

1、开发平台：Microsoft Visual Studio c++ 6.0

2.语言： c++

三、应用程序界面设计及变量的连接和方法的名称

对象	ID	Caption	连接变量或方法
成组框	IDC_STATIC	产生密钥
编辑框	IDC_NUMBER_EDIT	无	m_NumberEdit/CEdit
编辑框	IDC_RESOURCE_EDIT	无	m_ResourceEdit/CEdit OnChangeResourceEdit()
编辑框	IDC_ENCRYPT_EDIT	无	m_EncryptEdit/CEdit
编辑框	IDC_OPEN_EDIT	无	m_OpenEdit/CEdit
编辑框	IDC_LINE	无	m_Line/CEdit
编辑框	IDC_CHAR	无	m_Char/CEdit
编辑框	IDC_KEY_EDIT	无	m_KeyEdit/CEdit
命令按钮	IDC_CLEARNUM_BUTTON	重置	OnClearnumButton()
命令按钮	IDC_HIDEKEY_BUTTON	隐藏密钥	OnHidekeyButton()
命令按钮	IDC_SHOWKEY_BUTTON	显示密钥	OnShowkeyButton()
命令按钮	IDC_CLEARKEY_BUTTON	重置	OnClearkeyButton()
命令按钮	IDC_HIDETEXT_BUTTON	隐藏密文	OnHidetextButton()
命令按钮	IDC_SHOWTEXT_BUTTON	显示密文	OnShowtextButton()
命令按钮	IDC_OK_BUTTON	确定	OnOkButton()
命令按钮	IDC_CLEAR_BUTTON	Clear	OnClearButton()
命令按钮	IDC_EXIT_BUTTON	Exit	OnExitButton()
命令按钮	IDC_ENCRYPT_BUTTON	加密	OnEncryptButton()
命令按钮	IDC_OPEN_BUTTON	解密	OnOpenButton()
编辑框	IDC_FORCE_OPEN_EDIT	无	m_ForceOpenEdit/CEdit
编辑框	IDC_GETENCRYPT_EDIT	无	m_GetEncryptEdit/CEdit
菜单	ID_ENCRYPT_MENU	加密	OnEncryptMenu()
菜单	ID_OPEN_MENU	解密	OnOpenMenu()
菜单	ID_CLEAR_MENU	清除	OnClearMenu()
菜单	ID_EXIT_MENU	退出	OnExitMenu()
菜单	ID_ABOUT_MENU	关于	OnAboutMenu()

四、CeasarDlg.h声明

// CeasarDlg.h : header file

#if !defined(AFX_CEASARDLG_H__E2ECB937_D748_475D_BDA2_6D8728998EFC__INCLUDED_)

#define AFX_CEASARDLG_H__E2ECB937_D748_475D_BDA2_6D8728998EFC__INCLUDED_

#if _MSC_VER > 1000

#pragma once

#endif // _MSC_VER > 1000

Const char lowerArray[26]={'a','b','c','d','e','f','g','h','i','j','k','l',

'm','n','o','p','q','r','s','t','u','v','w','x','y','z'};

const char upperArray[26]={'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','

Q','R','S','T','U','V','W','X','Y','Z'};

/////////////////////////////////////////////////////////////////////////////

// CCeasarDlg dialog

class CCeasarDlg : public CDialog

{

// Construction

public:

CCeasarDlg(CWnd* pParent = NULL); // standard constructor

// Dialog Data

//{{AFX_DATA(CCeasarDlg)

enum { IDD = IDD_CEASAR_DIALOG };

CEdit m_GetEncryptEdit;

CEdit m_GetEnryptEdit;

CEdit m_ForceOpenEdit;

CEdit m_NumberEdit;

CEdit m_KeyEdit;

CEdit m_EncryptEdit;

CEdit m_ResourceEdit;

CEdit m_OpenEdit;

CEdit m_Line;

CEdit m_Char;

CEdit m_keyEdit;

//}}AFX_DATA

// ClassWizard generated virtual function overrides

//{{AFX_VIRTUAL(CCeasarDlg)

protected:

virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support

//}}AFX_VIRTUAL

// Implementation

protected:

HICON m_hIcon;

// Generated message map functions

//{{AFX_MSG(CCeasarDlg)

virtual BOOL OnInitDialog();

afx_msg void OnSysCommand(UINT nID, LPARAM lParam);

afx_msg void OnPaint();

afx_msg HCURSOR OnQueryDragIcon();

afx_msg void OnClearkeyButton();

afx_msg void OnHidekeyButton();

afx_msg void OnShowkeyButton();

afx_msg void OnChangeResourceEdit();

afx_msg void OnClearButton();

afx_msg void OnExitButton();

afx_msg void OnHidetextButton();

afx_msg void OnShowtextButton();

afx_msg void OnEncryptButton();

afx_msg void OnOpenButton();

afx_msg void OnOkButton();

afx_msg void OnClearnumButton();

afx_msg void OnEncryptMenu();

afx_msg void OnOpenMenu();

afx_msg void OnExitMenu();

afx_msg void OnClearMenu();

afx_msg void OnAboutMenu();

//}}AFX_MSG

DECLARE_MESSAGE_MAP()

};

//{{AFX_INSERT_LOCATION}}

// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_CEASARDLG_H__E2ECB937_D748_475D_BDA2_6D8728998EFC__INCLUDED_)

五、映射消息的应用程序代码

1、void CCeasarDlg::OnClearkeyButton()

{

// TODO: Add your control notification handler code here

m_KeyEdit.SetSel(0,-1);

m_KeyEdit.ReplaceSel("");

}

2、void CCeasarDlg::OnHidekeyButton()

{

// TODO: Add your control notification handler code here

m_KeyEdit.ShowWindow(SW_HIDE);

}

3、void CCeasarDlg::OnShowkeyButton()

{

// TODO: Add your control notification handler code here

m_KeyEdit.ShowWindow(SW_SHOW);

}

4、void CCeasarDlg::OnChangeResourceEdit()

{

// TODO: Add your control notification handler code here

CString METext;

char Count[10];

int nCharNum,nLineNum;

m_ResourceEdit.GetWindowText(METext);

nCharNum=METext.GetLength();

nLineNum=m_ResourceEdit.GetLineCount();

itoa(nCharNum,Count,10);

m_Char.SetWindowText(Count);

itoa(nLineNum,Count,10);

m_Line.SetWindowText(Count);

}

5、void CCeasarDlg::OnClearButton()

{

// TODO: Add your control notification handler code here

m_ResourceEdit.SetSel(0,-1);

m_ResourceEdit.ReplaceSel("");

m_EncryptEdit.SetSel(0,-1);

m_EncryptEdit.ReplaceSel("");

m_OpenEdit.SetSel(0,-1);

m_OpenEdit.ReplaceSel("");

UpdateData(FALSE);

}

6、void CCeasarDlg::OnExitButton()

{

// TODO: Add your control notification handler code here

OnOK();

}

7、void CCeasarDlg::OnHidetextButton()

{

// TODO: Add your control notification handler code here

m_EncryptEdit.ShowWindow(SW_HIDE);

}

8、void CCeasarDlg::OnShowtextButton()

{

// TODO: Add your control notification handler code here

m_EncryptEdit.ShowWindow(SW_SHOW);

}

9、void CCeasarDlg::OnEncryptButton()

{

// TODO: Add your control notification handler code here

char sArray[10];

int nCount;

int nKey;

m_Char.GetWindowText(sArray,10);

nCount=atoi(sArray);

m_KeyEdit.GetWindowText(sArray,10);

nKey=atoi(sArray);

char sResourceText[300];

char sEncryptText[300];

char *pResourceText=sResourceText;

char *pEncryptText=sEncryptText;

m_ResourceEdit.GetWindowText(sResourceText,300);

int nTemp1,nTemp2,i,j;

for(i=0;i<nCount;i++)

{

if((*pResourceText>='A'&&*pResourceText<='Z')||(*pResourceText>='a'&&*pResourceText<='z'))

{

if(*pResourceText>='A'&&*pResourceText<='Z')

{

for(j=0;j<26;j++)

if(upperArray[j]==*pResourceText)

{

nTemp1=j;

break;

}

nTemp2=(nTemp1+nKey%26)%26;

*pEncryptText=upperArray[nTemp2];

}

else

{

for(j=0;j<26;j++)

if(lowerArray[j]==*pResourceText)

{

nTemp1=j;

break;

}

nTemp2=(nTemp1+nKey%26)%26;

*pEncryptText=lowerArray[nTemp2];

}

}

else

*pEncryptText=*pResourceText;

pResourceText++;

pEncryptText++;

}

*pEncryptText='\0';

m_EncryptEdit.SetWindowText(sEncryptText);

}

10、void CCeasarDlg::OnOpenButton()

{

// TODO: Add your control notification handler code here

char sArray[10];

int nCount;

int nKey;

m_Char.GetWindowText(sArray,10);

nCount=atoi(sArray);

m_KeyEdit.GetWindowText(sArray,10);

nKey=atoi(sArray);

char sOpenText[300];

char sEncryptText[300];

char *pOpenText=sOpenText;

char *pEncryptText=sEncryptText;

m_EncryptEdit.GetWindowText(sEncryptText,300);

int nTemp1,nTemp2,i,j;

for(i=0;i<nCount;i++)

{

if((*pEncryptText>='A'&&*pEncryptText<='Z')||(*pEncryptText>='a'&&*pEncryptText<='z'))

{

if(*pEncryptText>='A'&&*pEncryptText<='Z')

{

for(j=0;j<26;j++)

if(upperArray[j]==*pEncryptText)

{

nTemp1=j;

break;

}

nTemp2=(nTemp1-nKey%26+26)%26;

*pOpenText=upperArray[nTemp2];

}

else

{

for(j=0;j<26;j++)

if(lowerArray[j]==*pEncryptText)

{

nTemp1=j;

break;

}

nTemp2=(nTemp1-nKey%26+26)%26;

*pOpenText=lowerArray[nTemp2];

}

}

else

*pOpenText=*pEncryptText;

pEncryptText++;

pOpenText++;

}

*pOpenText='\0';

m_OpenEdit.SetWindowText(sOpenText);

}

11、void CCeasarDlg::OnOkButton()

{

// TODO: Add your control notification handler code here

char sArray[10];

int nCount;

int nNumber;

m_Char.GetWindowText(sArray,10);

nCount=atoi(sArray);

m_NumberEdit.GetWindowText(sArray,10);

nNumber=atoi(sArray);

char sForceOpenText[300];

char sGetEncryptText[300];

char *pForceOpenText=sForceOpenText;

char *pGetEncryptText=sGetEncryptText;

m_GetEncryptEdit.GetWindowText(sGetEncryptText,300);

int nTemp1,nTemp2,i,j;

for(i=0;i<nCount;i++)

{

if((*pGetEncryptText>='A'&&*pGetEncryptText<='Z')||(*pGetEncryptText>='a'&&*pGetEncryptText<='z'))

{

if(*pGetEncryptText>='A'&&*pGetEncryptText<='Z')

{

for(j=0;j<26;j++)

if(upperArray[j]==*pGetEncryptText)

{

nTemp1=j;

break;

}

nTemp2=(nTemp1-nNumber+26)%26;

*pForceOpenText=upperArray[nTemp2];

}

else

{

for(j=0;j<26;j++)

if(lowerArray[j]==*pGetEncryptText)

{

nTemp1=j;

break;

}

nTemp2=(nTemp1-nNumber+26)%26;

*pForceOpenText=lowerArray[nTemp2];

}

}

else

*pForceOpenText=*pGetEncryptText;

pGetEncryptText++;

pForceOpenText++;

}

*pForceOpenText='\0';

m_ForceOpenEdit.SetWindowText(sForceOpenText);

}

12、void CCeasarDlg::OnClearnumButton()

{

// TODO: Add your control notification handler code here

m_NumberEdit.SetSel(0,-1);

m_NumberEdit.ReplaceSel("");

m_ForceOpenEdit.SetSel(0,-1);

m_ForceOpenEdit.ReplaceSel("");

m_GetEncryptEdit.SetSel(0,-1);

m_GetEncryptEdit.ReplaceSel("");

}

13、void CCeasarDlg::OnEncryptMenu()

{

// TODO: Add your command handler code here

OnEncryptButton();

}

14、void CCeasarDlg::OnOpenMenu()

{

// TODO: Add your command handler code here

OnOpenButton();

}

15、void CCeasarDlg::OnExitMenu()

{

// TODO: Add your command handler code here

OnExitButton();

}

16、void CCeasarDlg::OnClearMenu()

{

// TODO: Add your command handler code here

OnClearButton();

}

17、void CCeasarDlg::OnAboutMenu()

{

// TODO: Add your command handler code here

MessageBox("This is a Clear!");

}