信息安全实验--RSA算法(MFC)

这门课的第二个实验，用MFC实现的，效率较低，上课时没好好听课。。。不知道优化的算法

再加上本来就不感兴趣，后来知道有更好的算法也懒得改了。

用VS2012写的，没vs2012组件直接打开exe的话肯定是各种dll缺少。。.

 

界面：

 

代码依旧是各种混乱，真心不知道怎么写着写着就成这样了。。。

 

 

主要的RSADlg.cpp：

// RSADlg.cpp : 实现文件
//

#include "stdafx.h"
#include "RSA.h"
#include "RSADlg.h"
#include "afxdialogex.h"
#include "CBigInt.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

const CString init_n = TEXT("11118307997040540127125109823105301271848973550332368954427695640548513432576994259450033803985092311988645890908953534205158975851659781290866722576482516739954578771412610881330317110987253909648837");
const CString init_e = TEXT("17");
const CString init_d = TEXT("6540181174729729486544182248885471336381749147254334679075115082675596136809996623205902237638289590519567442714719605581557953788754188384094731719545461497844638924792771085828281336401032879552233");

CBigInt n, e, d;
int plainRadio = 2, cipherRadio = 2;

// 用于应用程序“关于”菜单项的 CAboutDlg 对话框

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

	// 对话框数据
	enum { IDD = IDD_ABOUTBOX };

protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持

	// 实现
protected:
	DECLARE_MESSAGE_MAP()
	//	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
};

CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CRSADlg 对话框



CRSADlg::CRSADlg(CWnd* pParent /*=NULL*/)
	: CDialogEx(CRSADlg::IDD, pParent)
	//	, plainRadio(0)
	//	, cipherRadio(0)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CRSADlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
	//  DDX_Radio(pDX, IDC_RADIO_PLAIN_STRING, plainRadio);
	//  DDX_Radio(pDX, IDC_RADIO_CIPHER_STRING, cipherRadio);
}

BEGIN_MESSAGE_MAP(CRSADlg, CDialogEx)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(ID_CAL_PRIVATE_KEY, &CRSADlg::OnBnClickedCalPrivateKey)
	ON_BN_CLICKED(IDC_BUTTON_ENCRYPT, &CRSADlg::OnBnClickedButtonEncrypt)
	ON_BN_CLICKED(IDC_BUTTON_DECRYPT, &CRSADlg::OnBnClickedButtonDecrypt)
	ON_BN_CLICKED(ID_RANDOM_KEY, &CRSADlg::OnBnClickedRandomKey)
	ON_BN_CLICKED(ID_CLEARALL, &CRSADlg::OnBnClickedClearall)
	ON_BN_CLICKED(IDC_RADIO_PLAIN_STRING, &CRSADlg::OnBnClickedRadioPlainString)
	ON_BN_CLICKED(IDC_RADIO_PLAIN_HEX, &CRSADlg::OnBnClickedRadioPlainHex)
	ON_BN_CLICKED(IDC_RADIO_PLAIN_DEC, &CRSADlg::OnBnClickedRadioPlainDec)
	ON_BN_CLICKED(IDC_RADIO_CIPHER_STRING, &CRSADlg::OnBnClickedRadioCipherString)
	ON_BN_CLICKED(IDC_RADIO_CIPHER_HEX, &CRSADlg::OnBnClickedRadioCipherHex)
	ON_BN_CLICKED(IDC_RADIO_CIPHER_DEC, &CRSADlg::OnBnClickedRadioCipherDec)
END_MESSAGE_MAP()


// CRSADlg 消息处理程序

BOOL CRSADlg::OnInitDialog()
{
	CDialogEx::OnInitDialog();

	// 将“关于...”菜单项添加到系统菜单中。

	// IDM_ABOUTBOX 必须在系统命令范围内。
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		BOOL bNameValid;
		CString strAboutMenu;
		bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
		ASSERT(bNameValid);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动
	//  执行此操作
	SetIcon(m_hIcon, TRUE);			// 设置大图标
	SetIcon(m_hIcon, FALSE);		// 设置小图标

	// TODO: 在此添加额外的初始化代码
	((CButton *)GetDlgItem(IDC_RADIO_PLAIN_DEC))->SetCheck(TRUE);
	((CButton *)GetDlgItem(IDC_RADIO_CIPHER_DEC))->SetCheck(TRUE);
	CheckRadioButton(IDC_RADIO_PLAIN_STRING, IDC_RADIO_PLAIN_HEX, IDC_RADIO_PLAIN_DEC);
	CheckRadioButton(IDC_RADIO_CIPHER_STRING, IDC_RADIO_CIPHER_HEX, IDC_RADIO_CIPHER_DEC);

	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_P))->SetWindowText(TEXT("1749216447926182514702512105742818919045636858560222269112115108465858265383133709531890334596655423"));
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_Q))->SetWindowText(TEXT("6356164790367747690013998348667958741992268820093032963081503584133406634652288529307215163417754619"));
	((CEdit*) GetDlgItem(IDC_EDIT_PUBLIC_KEY_PRIME_E))->SetWindowText(init_e);
	((CEdit*) GetDlgItem(IDC_EDIT_PRIVATE_KEY_PRIME_D))->SetWindowText(init_d);
	((CEdit*) GetDlgItem(IDC_EDIT_PLAINTEXT))->SetWindowText(TEXT("123456"));
	n.InPutFromStr(init_n);
	e.InPutFromStr(init_e);
	d.InPutFromStr(init_d);
	
	srand(unsigned(time(NULL)));	//初始化随机数

	return TRUE;  // 除非将焦点设置到控件，否则返回 TRUE
}

void CRSADlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialogEx::OnSysCommand(nID, lParam);
	}
}

// 如果向对话框添加最小化按钮，则需要下面的代码
//  来绘制该图标。对于使用文档/视图模型的 MFC 应用程序，
//  这将由框架自动完成。

void CRSADlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // 用于绘制的设备上下文

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast(dc.GetSafeHdc()), 0);

		// 使图标在工作区矩形中居中
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// 绘制图标
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialogEx::OnPaint();
	}
}

//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CRSADlg::OnQueryDragIcon()
{
	return static_cast(m_hIcon);
}


//手动输入数据
void CRSADlg::OnBnClickedCalPrivateKey()
{
	CBigInt  n1, p, q, cbi_t, cbi_t2;
	CString str;
	char ca[10];

	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_P))->GetWindowText(str);
	if (str.GetLength() < 1){
		MessageBox(TEXT("请输入素数p！"), TEXT("错误"), MB_OK);
		return;
	}
	p = p.InPutFromStr(str);
	cbi_t.Mov(2);
	if (cbi_t.Cmp(cbi_t.Mon(p, p)) != 0 && (p.Cmp(2) != 0)){
		MessageBox(TEXT("输入的p不是素数！"), TEXT("错误"), MB_OK);
		return;
	}

	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_Q))->GetWindowText(str);
	if (str.GetLength() < 1){
		MessageBox(TEXT("请输入素数q！"), TEXT("错误"), MB_OK);
		return;
	}
	q = q.InPutFromStr(str);
	if (cbi_t.Cmp(cbi_t.Mon(q, q)) != 0 && (q.Cmp(2) != 0)){
		MessageBox(TEXT("输入的q不是素数！"), TEXT("错误"), MB_OK);
		return;
	}
	if (p.Cmp(q) == 0){
		MessageBox(TEXT("q不能等于p！"), TEXT("错误"), MB_OK);
		return;
	}

	((CEdit*) GetDlgItem(IDC_EDIT_PUBLIC_KEY_PRIME_E))->GetWindowText(str);
	if (str.GetLength() < 1){
		MessageBox(TEXT("请输入素数e！"), TEXT("错误"), MB_OK);
		return;
	}
	e.~CBigInt();
	e = e.InPutFromStr(str);
	if (cbi_t.Cmp(cbi_t.Mon(e, e)) != 0 && (e.Cmp(2) != 0)){
		MessageBox(TEXT("输入的e不是素数！"), TEXT("错误"), MB_OK);
		return;
	}

	n.~CBigInt();
	n.Mov(p);
	n.Mul(q);

	n1.Mov(p.Sub(1));
	n1.Mul(q.Sub(1));

	if (e.Cmp(n1) != -1){
		MessageBox(TEXT("素数e要小于φ(n)=(p-1)(q-1)！"), TEXT("错误"), MB_OK);
		return;
	}
	cbi_t2.Mov(e);
	if (n1.Mon(cbi_t2.Sub(1), e).Cmp(1) != 0){
		MessageBox(TEXT("素数e和φ(n)=(p-1)(q-1)不互质！"), TEXT("错误"), MB_OK);
		return;
	}

	d.~CBigInt();
	d = e.Euc(n1);
	
	((CEdit*) GetDlgItem(IDC_EDIT_PRIVATE_KEY_PRIME_D))->SetWindowText(d.getResult());

	((CEdit*) GetDlgItem(IDC_EDIT_PUBLIC_KEY_PRIME_E))->GetWindowText(str);
	_itoa_s(str.GetLength(), ca, 10);
	str = ca;
	((CEdit*) GetDlgItem(IDC_EDIT_KEY_LENGTH))->SetWindowText(str);
	
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_P))->GetWindowText(str);
	_itoa_s(str.GetLength(), ca, 10);
	str = ca;
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_BITS_P))->SetWindowText(str);
	
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_Q))->GetWindowText(str);
	_itoa_s(str.GetLength(), ca, 10);
	str = ca;
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_BITS_Q))->SetWindowText(str);
}

//随机计算密钥
void CRSADlg::OnBnClickedRandomKey()
{
	CBigInt  n1, p, q, cbi_t, cbi_t2, tmp1, tmp2;
	CString str;
	int key_length, prime_bits_p, prime_bits_q, sign;

	((CEdit*) GetDlgItem(IDC_EDIT_KEY_LENGTH))->GetWindowText(str);
	key_length = _ttoi(str);
	//str.Format(TEXT("%d"), key_length);
	//MessageBox(str, TEXT("结果"), MB_OK);

	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_BITS_P))->GetWindowText(str);
	prime_bits_p = _ttoi(str);
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_BITS_Q))->GetWindowText(str);
	prime_bits_q = _ttoi(str);

	if (key_length < 1 || prime_bits_p < 1 || prime_bits_q < 1){
		MessageBox(TEXT("请输入公钥长度和随机素数的位数！"), TEXT("错误"), MB_OK);
		return;
	}

	str = random_prime(prime_bits_p);
	p = p.InPutFromStr(str);
	cbi_t.Mov(2);
	while(true){
		if (cbi_t.Cmp(cbi_t.Mon(p, p)) == 0 || (p.Cmp(2) == 0))
			break;
		p.Add(1);
		if (p.Cmp(pow(10, prime_bits_p)) != -1){
			str = random_prime(prime_bits_p);
			p.~CBigInt();
			p = p.InPutFromStr(str);
		}
	}
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_P))->SetWindowText(p.getResult());

	str = random_prime(prime_bits_q);
	q = q.InPutFromStr(str);
	cbi_t.Mov(2);
	while(true){
		if (cbi_t.Cmp(cbi_t.Mon(q, q)) == 0 || (q.Cmp(2) == 0))
			if (p.Cmp(q) != 0)
				break;
		q.Add(1);
		if (q.Cmp(pow(10, prime_bits_q)) != -1){
			str = random_prime(prime_bits_q);
			q.~CBigInt();
			q = q.InPutFromStr(str);
		}
	}
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_Q))->SetWindowText(q.getResult());

	n.~CBigInt();
	n.Mov(p);
	n.Mul(q);

	n1.Mov(p.Sub(1));
	n1.Mul(q.Sub(1));

	str = random_prime(key_length);
	e.~CBigInt();
	e = e.InPutFromStr(str);
	cbi_t.Mov(2);
	sign = 0;
	while(true){
		if (cbi_t.Cmp(cbi_t.Mon(e, e)) == 0 || (e.Cmp(2) == 0)){
			cbi_t2.Mov(e);
			if (n1.Mon(cbi_t2.Sub(1), e).Cmp(1) == 0)
				if (e.Cmp(n) == -1)
					break;
		}
		e.Add(1);
		if (e.Cmp(pow(10, key_length)) != -1){
			if (sign = 1000000){
				((CEdit*) GetDlgItem(IDC_EDIT_PUBLIC_KEY_PRIME_E))->SetWindowText(TEXT(""));
				((CEdit*) GetDlgItem(IDC_EDIT_PRIVATE_KEY_PRIME_D))->SetWindowText(TEXT(""));
				MessageBox(TEXT("根据p和q随机计算了e 1000000次还未算出，可能不存在符合条件的素数e，请重新随机计算！"), TEXT("错误"), MB_OK);
				return;
			}
			str = random_prime(key_length);
			e.~CBigInt();
			e = e.InPutFromStr(str);
			sign++;
		}
	}
	((CEdit*) GetDlgItem(IDC_EDIT_PUBLIC_KEY_PRIME_E))->SetWindowText(e.getResult());

	d.~CBigInt();
	d = e.Euc(n1);

	((CEdit*) GetDlgItem(IDC_EDIT_PRIVATE_KEY_PRIME_D))->SetWindowText(d.getResult());
}

//加密数据
void CRSADlg::OnBnClickedButtonEncrypt()
{
	CString str, des;
	if (d.Cmp(0) == 0){
		MessageBox(TEXT("请先计算私钥d，否则后果自负。。"), TEXT("严重警告"));
		return;
	}
	((CEdit*) GetDlgItem(IDC_EDIT_PLAINTEXT))->GetWindowText(str);
	if (str.GetLength() < 1){
		MessageBox(TEXT("请输入要加密的东东。。。（︶︿︶）"), TEXT("提示"));
		return;
	}
	des = RSAcalculate(str, true);
	((CEdit*) GetDlgItem(IDC_EDIT_CIPHERTEXT))->SetWindowText(des);
}

//解密数据
void CRSADlg::OnBnClickedButtonDecrypt()
{
	CString str, des;
	if (d.Cmp(0) == 0){
		MessageBox(TEXT("请先计算私钥d，否则后果自负。。"), TEXT("严重警告"));
		return;
	}
	((CEdit*) GetDlgItem(IDC_EDIT_CIPHERTEXT))->GetWindowText(str);
	if (str.GetLength() < 1){
		MessageBox(TEXT("请输入要解密的东东。。。（︶︿︶）"), TEXT("提示"));
		return;
	}
	des = RSAcalculate(str, false);
	((CEdit*) GetDlgItem(IDC_EDIT_PLAINTEXT))->SetWindowText(des);
}

//随机出素数，a为位数
CString CRSADlg::random_prime(int a)
{
	CString str;
	int i, t, len = a;
	//rand();	//不加这个，第一位很难改变，原因估计与time有关
	t = 1+(10-1)*rand()/(RAND_MAX + 1.0);
	str = (char)(t + 48);
	for (i = 1; i < a; ++i){
		t = 10*rand()/(RAND_MAX + 1.0);
		str += (char)(t + 48);
	}
	return str;
}

//清空所有输入输出
void CRSADlg::OnBnClickedClearall()
{
	((CEdit*) GetDlgItem(IDC_EDIT_KEY_LENGTH))->SetWindowText(TEXT(""));
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_BITS_P))->SetWindowText(TEXT(""));
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_BITS_Q))->SetWindowText(TEXT(""));
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_P))->SetWindowText(TEXT(""));
	((CEdit*) GetDlgItem(IDC_EDIT_PRIME_Q))->SetWindowText(TEXT(""));
	((CEdit*) GetDlgItem(IDC_EDIT_PUBLIC_KEY_PRIME_E))->SetWindowText(TEXT(""));
	((CEdit*) GetDlgItem(IDC_EDIT_PRIVATE_KEY_PRIME_D))->SetWindowText(TEXT(""));
	((CEdit*) GetDlgItem(IDC_EDIT_PLAINTEXT))->SetWindowText(TEXT(""));
	((CEdit*) GetDlgItem(IDC_EDIT_CIPHERTEXT))->SetWindowText(TEXT(""));
	n.~CBigInt();
	e.~CBigInt();
	d.~CBigInt();
}

//明文字符串
void CRSADlg::OnBnClickedRadioPlainString()
{
	plainRadio = 0;
	OnBnClickedButtonDecrypt();
}

//明文16进制
void CRSADlg::OnBnClickedRadioPlainHex()
{
	plainRadio = 1;
	OnBnClickedButtonDecrypt();
}

//明文10进制
void CRSADlg::OnBnClickedRadioPlainDec()
{
	plainRadio = 2;
	OnBnClickedButtonDecrypt();
}



//密文字符串
void CRSADlg::OnBnClickedRadioCipherString()
{
	cipherRadio = 0;
	OnBnClickedButtonEncrypt();
}

//密文16进制
void CRSADlg::OnBnClickedRadioCipherHex()
{
	cipherRadio = 1;
	OnBnClickedButtonEncrypt();
}

//密文10进制
void CRSADlg::OnBnClickedRadioCipherDec()
{
	cipherRadio = 2;
	OnBnClickedButtonEncrypt();
}

//将一个16进制字符转为对应的10进制数
int CRSADlg::HEXtoDEC(char a)
{
	int b;
	if (a >= 'a' && a <= 'f')
		b = (int)a - 87;
	else if (a >= 'A' && a <= 'F')
		b = (int)a - 55;
	else if (a >= '0' && a <= '9')
		b = (int)a - 48;
	else
		b = 0;
	return b;
}

//将一个10进制数转为对应的16进制字符
char CRSADlg::DECtoHEX(int a)
{
	char b;
	if (a >= 0 && a <= 9)
		b = a + 48;
	else if (a >= 10 && a <= 15)
		b = a + 55;
	else
		b = 0;
	return b;
}

//加密，解密的具体实现
CString CRSADlg::RSAcalculate(CString str, bool isEncrypt)
{
	CString des, s1, s2;
	CBigInt m, c, tmp;
	__int64 i, j, a, b, ach, byte2;
	if (isEncrypt){
		if (plainRadio == 0 || plainRadio == 1){
			if (plainRadio == 1){
				if (!isCorrectFormat(str, 1)){
					::MessageBox(NULL, TEXT("输入的明文字符串不是十六进制数！！请重新输入！！"), TEXT("错误"), MB_OK);
					return NULL;
				}
			}
			if (plainRadio == 0){
				s1 = str;
				str.Empty();
				for (j = 0; j < s1.GetLength(); ++j){
					s2.Format(TEXT("%x"), (int)s1[j]);
					str += s2;
				}
			}
			a = HEXtoDEC(str[0]);
			b = HEXtoDEC(str[1]);
			ach = a*16 + b;
			m.~CBigInt();
			m.Mov(ach);
			for (i = 2; i < str.GetLength(); ++i){
				m.Mul(16);
				m.Mul(16);
				a = HEXtoDEC(str[i]);
				i++;
				b = HEXtoDEC(str[i]);
				ach = a*16 + b;
				m.Add(ach);
			}
		} else if (plainRadio == 2){
			if (!isCorrectFormat(str, 2)){
				::MessageBox(NULL, TEXT("输入的明文字符串不是十进制数！！请重新输入！！"), TEXT("错误"), MB_OK);
				return NULL;
			}
			m = m.InPutFromStr(str);
		}
		if (m.Cmp(n) == 1){
			::MessageBox(NULL, TEXT("素数p，q太小，要加密的数据大于n！！\n请重新输入要加密的数据或者更改p和q！"), TEXT("错误"), MB_OK);
			return NULL;
		}
		c = m.Mon(e, n);

		if (cipherRadio == 0 || cipherRadio == 1) {
			s1.Empty();
			s2.Empty();
			tmp.Mov(c);
			for (; tmp.Cmp(0) != 0; ){
				byte2 = tmp.Mod(256);
				tmp.Div(256);
				/*_itoa_s(byte2, ca, 10);
				s2 = ca;
				MessageBox(s2);*/
				if (cipherRadio == 0){
					s1 += (char)byte2;
				} else {
					s2.Format(TEXT("%x"), (int)byte2);
					if (s2.GetLength() == 2)
					{
						s1 += s2[1];
						s1 += s2[0];
					} else {
						s1 += s2[0];
						s1 += '0';
					}
					s1.MakeUpper();
				}
			}
			str.Empty();
			for (i = s1.GetLength(); i > 0; --i){
				str += s1[i-1];
				s2 = s1[i-1];
			}
		} else if (cipherRadio == 2) {
			str = c.getResult();
		}
		//::MessageBox(NULL, str, TEXT(""), MB_OK);
		return str;
	} else {
		if (cipherRadio == 0 || cipherRadio == 1){
			if (cipherRadio == 1){
				if (!isCorrectFormat(str, 1)){
					::MessageBox(NULL, TEXT("输入的密文字符串不是十六进制数！！请重新输入！！"), TEXT("错误"), MB_OK);
					return NULL;
				}
			}
			if (cipherRadio == 0){
				s1 = str;
				str.Empty();
				for (j = 0; j < s1.GetLength(); ++j){
					s2.Format(TEXT("%x"), (int)s1[j]);
					str += s2;
				}
			}
			a = HEXtoDEC(str[0]);
			b = HEXtoDEC(str[1]);
			ach = a*16 + b;
			c.~CBigInt();
			c.Mov(ach);
			for (i = 2; i < str.GetLength(); ++i){
				c.Mul(16);
				c.Mul(16);
				a = HEXtoDEC(str[i]);
				i++;
				b = HEXtoDEC(str[i]);
				ach = a*16 + b;
				c.Add(ach);
			}
		} else if (cipherRadio == 2){
			if (!isCorrectFormat(str, 2)){
				::MessageBox(NULL, TEXT("输入的密文字符串不是十进制数！！请重新输入！！"), TEXT("错误"), MB_OK);
				return NULL;
			}
			c = c.InPutFromStr(str);
		}
		if (c.Cmp(n) == 1){
			::MessageBox(NULL, TEXT("素数p，q太小，要解密的数据大于n！！\n请重新输入要解密的数据或者更改p和q！"), TEXT("错误"), MB_OK);
			return NULL;
		}
		m = c.Mon(d, n);

		if (plainRadio == 0 || plainRadio == 1) {
			s1.Empty();
			s2.Empty();
			tmp.Mov(m);
			for (; tmp.Cmp(0) != 0; ){
				byte2 = tmp.Mod(256);
				tmp.Div(256);
				/*_itoa_s(byte2, ca, 10);
				s2 = ca;
				MessageBox(s2);*/
				if (plainRadio == 0){
					s1 += (char)byte2;
				} else {
					s2.Format(TEXT("%x"), (int)byte2);
					if (s2.GetLength() == 2)
					{
						s1 += s2[1];
						s1 += s2[0];
					} else {
						s1 += s2[0];
						s1 += '0';
					}
					s1.MakeUpper();
				}
			}
			str.Empty();
			for (i = s1.GetLength(); i > 0; --i){
				str += s1[i-1];
				s2 = s1[i-1];
			}
		} else if (plainRadio == 2) {
			str = m.getResult();
		}
		return str;
	}
}

//判断字符串是否符合指定格式
bool CRSADlg::isCorrectFormat(CString str, int form)
{
	if (form == 1)
		return (str == str.SpanIncluding(TEXT("0123456789ABCDEFabcdef")));
	else if (form == 2)
		return (str == str.SpanIncluding(TEXT("0123456789")));
	return false;
}