📄 main.cpp
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#include <windows.h>
#include <richedit.h>
#include "resource.h"
#include "LLongInt.h"
int GetPrime(int decBitCount, LLongInt &result)
{
int a = 0;
char number;
char *strDec;
strDec = new char[decBitCount+1];
if (strDec != NULL)
{
while (a < decBitCount)
{
__asm
{
rdtsc
mov number, al
}
number = number & 0x0f;
if (a > 0)
number = number ^ (strDec[a-1] - '0');
if (number > 9)
number = number - 6;
if (a==0 && number==0)
number = 5;
strDec[a] = number + '0';
a++;
}
strDec[decBitCount] = 0;
result = LLongInt(strDec);
if (result % LLongInt(2) == LLongInt("0"))
result = result + LLongInt(1);
while (result.IsPrime()==0)
result = result + LLongInt(2);
delete strDec;
return 1;
}
return 0;
}
int GetRandomLongInt(int decBitCount, LLongInt &result)
{
int a = 0;
char number;
char *strDec;
strDec = new char[decBitCount+1];
if (strDec != NULL)
{
while (a < decBitCount)
{
__asm
{
rdtsc
mov number, al
}
number = number & 0x0f;
if (a > 0)
number = number ^ (strDec[a-1] - '0');
if (number > 9)
number = number - 6;
if (a==0 && number==0)
number = 5;
strDec[a] = number + '0';
a++;
}
strDec[decBitCount] = 0;
result = LLongInt(strDec);
delete strDec;
return 1;
}
return 0;
}
LLongInt gcd(LLongInt a, LLongInt b)
{
LLongInt rm, quotient;
quotient = a.Divide(b, a, rm);
if (rm == LLongInt((__int64)0))
return b;
return gcd(b, rm);
}
LLongInt d, n, e;
int PrepareRSA(HWND hwnd)
{
char buff[1024];
GetDlgItemText(hwnd, IDC_EDIT_PUBLICKEY, buff, 200);
if (strlen(buff) < 50)
{
MessageBox(hwnd, "输入的公钥的长度太短！请输入一个至少为50个十进制位的。",
"错误", MB_ICONERROR);
return 0;
}
LLongInt p(buff);
if (p.IsPrime() == 0)
{
MessageBox(hwnd, "你输入的公钥不是素数！", "错误", MB_OK || MB_ICONERROR);
return 0;
}
GetDlgItemText(hwnd, IDC_EDIT_PRIVATEKEY, buff, 200);
if (strlen(buff) < 50)
{
MessageBox(hwnd, "输入的密钥的长度太短！请输入一个至少为50个十进制位的。",
"错误", MB_ICONERROR);
return 0;
}
LLongInt q(buff);
if (q.IsPrime() == 0)
{
MessageBox(hwnd, "你输入的密钥不是素数！", "错误", MB_OK || MB_ICONERROR);
return 0;
}
n = p * q;
LLongInt Rn = (p-LLongInt(1)) * (q-LLongInt(1));
GetRandomLongInt(10, e);
while (gcd(e, Rn) != LLongInt(1))
e = e + LLongInt(1);
int rc = e.ModRevert(Rn, d);
if (rc == 0)
{
MessageBox(hwnd, "e的对于Mod ∮(n) 的逆元不存在，你给出的密钥很可能有一个不是素数。", "错误", MB_ICONERROR);
return 0;
}
return 1;
}
DWORD CALLBACK RSADlgProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
static char *strEncrypt = NULL;
static char *strDecrypt = NULL;
static int enTxtLen = 0;
static int deTxtLen = 0;
static rsaPrepared = 0;
switch(msg)
{
case WM_INITDIALOG:
SetDlgItemText(hwnd, IDC_EDIT_PUBLICKEY, "4899540976259964394471845043944718734415425419221787504471845083734885697772440777425419227976260431");
SetDlgItemText(hwnd, IDC_EDIT_PRIVATEKEY, "8652875601744651885568756095429481687345073847847958699867386354255285560954255609542556095425429741");
SetDlgItemText(hwnd, IDC_EDIT_ENCRYPT, "你好，这是RSA加密和解密的演示程序。");
{
char buff[1024];
GetDlgItemText(hwnd, IDC_EDIT_PUBLICKEY, buff, 200);
LLongInt p(buff);
GetDlgItemText(hwnd, IDC_EDIT_PRIVATEKEY, buff, 200);
LLongInt q(buff);
n = p * q;
LLongInt Rn = (p-LLongInt(1)) * (q-LLongInt(1));
GetRandomLongInt(10, e);
while (gcd(e, Rn) != LLongInt(1))
e = e + LLongInt(1);
int rc = e.ModRevert(Rn, d);
rsaPrepared = 1;
}
break;
case WM_COMMAND:
{
if (HIWORD(wParam) == EN_CHANGE)
{
switch(LOWORD(wParam))
{
case IDC_EDIT_ENCRYPT:
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_DECRYPT), "");
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_DECRYPTRESULT), "");
break;
case IDC_EDIT_DECRYPT:
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_ENCRYPT), "");
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_DECRYPTRESULT), "");
break;
case IDC_EDIT_PUBLICKEY:
case IDC_EDIT_PRIVATEKEY:
rsaPrepared = 0;
enTxtLen = 0;
deTxtLen = 0;
break;
default:
break;
}
}
switch(LOWORD(wParam))
{
case IDC_BUTTON_ABOUT:
MessageBox(hwnd, "作者: 卢学东\nEMail: LuXueDong@163.net", "关于RSA演示", MB_ICONINFORMATION);
break;
case IDC_BUTTON_GENKEYS:
{
LLongInt p, q;
GetPrime(100, p);
GetPrime(100, q);
char buff[1024];
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_PUBLICKEY), p.LLongInt2A(buff, 10));
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_PRIVATEKEY), q.LLongInt2A(buff, 10));
n = p * q;
LLongInt Rn = (p-LLongInt(1)) * (q-LLongInt(1));
GetRandomLongInt(10, e);
while (gcd(e, Rn) != LLongInt(1))
e = e + LLongInt(1);
int rc = e.ModRevert(Rn, d);
if (rc == 0)
{
MessageBox(hwnd, "e的对于Mod ∮(n) 的逆元不存在，你给出的密钥很可能有一个不是素数。", "错误", MB_ICONERROR);
return 0;
}
rsaPrepared = 1;
}
break;
case IDC_BUTTON_ENCRYPT:
{
if (rsaPrepared == 0)
if (PrepareRSA(hwnd) == 0)
break;
rsaPrepared = 1;
if (strEncrypt != NULL)
{
delete strEncrypt;
strEncrypt = NULL;
}
int txtLen;
txtLen = SendMessage(GetDlgItem(hwnd, IDC_EDIT_ENCRYPT), EM_GETLIMITTEXT, 0, 0);
if (txtLen > 0)
{
strEncrypt = new char[txtLen + 4];
if (strEncrypt != NULL)
{
if (strDecrypt != NULL)
{
delete strDecrypt;
strDecrypt = NULL;
}
strDecrypt = new char[((txtLen+3)/4)*(n.GetBuffLength()+1)];
if (strDecrypt != NULL)
{
GetDlgItemText(hwnd, IDC_EDIT_ENCRYPT, strEncrypt, txtLen+1);
SetDlgItemText(hwnd, IDC_EDIT_DECRYPT, "");
SetDlgItemText(hwnd, IDC_EDIT_DECRYPTRESULT, "");
enTxtLen = strlen(strEncrypt);
enTxtLen = (enTxtLen + 3) /4 * 4;
deTxtLen = 0;
if (enTxtLen > 0)
{
strEncrypt[enTxtLen+1] = 0;
strEncrypt[enTxtLen+2] = 0;
strEncrypt[enTxtLen+3] = 0;
unsigned int *pInt = (unsigned int*)strEncrypt;
unsigned int *pIntDecrypt = (unsigned int*)strDecrypt;
int intLen = (enTxtLen + 3) / 4;
int a, b;
for (a=0; a<intLen; a++)
{
__int64 i64 = *pInt;
LLongInt m(i64);
LLongInt c;
c = m.ExpMod(e, n);
*(unsigned int*)pIntDecrypt = c.GetBuffLength();
pIntDecrypt++;
memcpy(pIntDecrypt, c.GetBuff(), c.GetBuffLength()*sizeof(unsigned int));
pIntDecrypt += c.GetBuffLength();
deTxtLen = deTxtLen + c.GetBuffLength()*sizeof(unsigned int) + sizeof(unsigned int);
pInt++;
}
char *strTmp = new char[deTxtLen*8];
if (strTmp != NULL)
{
strTmp[0] = 0;
pInt = (unsigned int*)strDecrypt;
for (a=0; a<intLen; a++)
{
b = *pInt;
pIntDecrypt = pInt + 1;
while (b > 0)
{
wsprintf(strTmp + strlen(strTmp), "%08x ", *pIntDecrypt);
pIntDecrypt++;
b--;
}
int len = strlen(strTmp);
strTmp[len-1] = '\n';
strTmp[len] = 0;
pInt = pInt + *pInt + 1;
}
SetDlgItemText(hwnd, IDC_EDIT_DECRYPT, strTmp);
delete strTmp;
}
}
}
}
}
}
break;
case IDC_BUTTON_DECRYPT:
{
if (rsaPrepared == 0)
if (PrepareRSA(hwnd) == 0)
break;
rsaPrepared = 1;
if (deTxtLen > 0)
{
char *strTmp = new char[deTxtLen+4];
if (strTmp != NULL)
{
int len = deTxtLen;
int a = 0;
unsigned int *pInt = (unsigned int*)strDecrypt;
while (len > 0)
{
LLongInt c(pInt+1, *pInt, 0);
LLongInt dc = c.ExpMod(d, n);
*(int*)(strTmp+a) = *(dc.GetBuff());
len = len - 4 - *pInt*4;
pInt = pInt + *pInt + 1;
a += 4;
}
strTmp[a] = 0;
SetDlgItemText(hwnd, IDC_EDIT_DECRYPTRESULT, strTmp);
delete strTmp;
}
}
}
break;
case IDC_BUTTON_EN_TOFILE:
{
OPENFILENAME ofn;
char fn[MAX_PATH];
fn[0] = 0;
memset(&ofn, 0, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.hwndOwner = hwnd;
ofn.lpstrFilter = "所有文本文件（*.txt）\0*.txt\0\0";
ofn.lpstrTitle = "保存要加密的文字";
ofn.lpstrFile = fn;
ofn.lpstrDefExt = "txt";
ofn.nMaxFile = sizeof(fn);
ofn.Flags = OFN_OVERWRITEPROMPT;
int rc;
rc = GetSaveFileName(&ofn);
if (rc != 0)
{
int txtLen;
txtLen = SendMessage(GetDlgItem(hwnd, IDC_EDIT_ENCRYPT), EM_GETLIMITTEXT, 0, 0);
if (txtLen > 0)
{
if (strEncrypt != NULL)
{
delete strEncrypt;
strEncrypt = NULL;
}
strEncrypt = new char[txtLen + 4];
if (strEncrypt != NULL)
{
GetWindowText(GetDlgItem(hwnd, IDC_EDIT_ENCRYPT), strEncrypt, txtLen+1);
HANDLE hFile = CreateFile(ofn.lpstrFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile != INVALID_HANDLE_VALUE)
{
DWORD dwWritten;
WriteFile(hFile, strEncrypt, strlen(strEncrypt), &dwWritten, NULL);
CloseHandle(hFile);
}
}
}
}
}
break;
case IDC_BUTTON_DE_TOFILE:
{
OPENFILENAME ofn;
char fn[MAX_PATH];
fn[0] = 0;
memset(&ofn, 0, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.hwndOwner = hwnd;
ofn.lpstrFilter = "所有RSA加密文件（*.rsa）\0*.rsa\0\0";
ofn.lpstrTitle = "保存加密了的文字";
ofn.lpstrFile = fn;
ofn.lpstrDefExt = "rsa";
ofn.nMaxFile = sizeof(fn);
ofn.Flags = OFN_OVERWRITEPROMPT;
int rc;
rc = GetSaveFileName(&ofn);
if (rc != 0)
{
if (deTxtLen > 0)
{
if (strDecrypt != NULL)
{
HANDLE hFile = CreateFile(ofn.lpstrFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile != INVALID_HANDLE_VALUE)
{
DWORD dwWritten;
WriteFile(hFile, strDecrypt, deTxtLen, &dwWritten, NULL);
CloseHandle(hFile);
}
}
}
}
}
break;
case IDC_BUTTON_EN_FROMFILE:
{
OPENFILENAME ofn;
char fn[MAX_PATH];
fn[0] = 0;
memset(&ofn, 0, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.hwndOwner = hwnd;
ofn.lpstrFilter = "所有文本文件（*.txt）\0*.txt\0\0";
ofn.lpstrTitle = "打开要加密的文件";
ofn.lpstrFile = fn;
ofn.nMaxFile = sizeof(fn);
ofn.Flags = OFN_FILEMUSTEXIST;
int rc;
rc = GetOpenFileName(&ofn);
if (rc != 0)
{
if (strEncrypt != NULL)
{
delete strEncrypt;
strEncrypt = NULL;
}
WIN32_FILE_ATTRIBUTE_DATA wfad;
rc = GetFileAttributesEx(ofn.lpstrFile, GetFileExInfoStandard, &wfad);
if (rc != 0)
{
strEncrypt = new char[wfad.nFileSizeLow + 4];
if (strEncrypt != NULL)
{
HANDLE hFile = CreateFile(ofn.lpstrFile, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile != INVALID_HANDLE_VALUE)
{
DWORD dwRead;
ReadFile(hFile, strEncrypt, wfad.nFileSizeLow, &dwRead, NULL);
strEncrypt[dwRead] = 0;
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_ENCRYPT), strEncrypt);
CloseHandle(hFile);
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_DECRYPT), "");
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_DECRYPTRESULT), "");
}
}
enTxtLen = wfad.nFileSizeLow;
deTxtLen = 0;
}
}
}
break;
case IDC_BUTTON_DE_FROMFILE:
{
OPENFILENAME ofn;
char fn[MAX_PATH];
fn[0] = 0;
memset(&ofn, 0, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.hwndOwner = hwnd;
ofn.lpstrFilter = "所有RSA加密文件（*.rsa）\0*.rsa\0\0";
ofn.lpstrTitle = "打开已经加密了的文件";
ofn.lpstrFile = fn;
ofn.nMaxFile = sizeof(fn);
ofn.Flags = OFN_FILEMUSTEXIST;
int rc;
rc = GetOpenFileName(&ofn);
if (rc != 0)
{
if (strDecrypt != NULL)
{
delete strDecrypt;
strDecrypt = NULL;
}
WIN32_FILE_ATTRIBUTE_DATA wfad;
rc = GetFileAttributesEx(ofn.lpstrFile, GetFileExInfoStandard, &wfad);
if (rc != 0)
{
strDecrypt = new char[wfad.nFileSizeLow + 4];
if (strDecrypt != NULL)
{
HANDLE hFile = CreateFile(ofn.lpstrFile, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile != INVALID_HANDLE_VALUE)
{
DWORD dwRead;
ReadFile(hFile, strDecrypt, wfad.nFileSizeLow, &dwRead, NULL);
strDecrypt[dwRead] = 0;
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_DECRYPT), strDecrypt);
CloseHandle(hFile);
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_ENCRYPT), "");
SetWindowText(GetDlgItem(hwnd, IDC_EDIT_DECRYPTRESULT), "");
}
}
deTxtLen = wfad.nFileSizeLow;
enTxtLen = 0;
rsaPrepared = 0;
char *strTmp = new char[deTxtLen*8];
if (strTmp != NULL)
{
strTmp[0] = 0;
int a, b;
int len = deTxtLen;
unsigned int *pInt = (unsigned int*)strDecrypt;
unsigned int *pDecryptBlock;
while (len > 0)
{
b = *pInt;
pDecryptBlock = pInt + 1;
while (b > 0)
{
wsprintf(strTmp + strlen(strTmp), "%08x ", *pDecryptBlock);
pDecryptBlock++;
b--;
}
int lenStrTmp = strlen(strTmp);
strTmp[lenStrTmp-1] = '\n';
strTmp[lenStrTmp] = 0;
len = len - *pInt * 4 - 4;
pInt = pInt + *pInt + 1;
}
SetDlgItemText(hwnd, IDC_EDIT_DECRYPT, strTmp);
delete strTmp;
}
}
}
}
break;
case IDCANCEL:
if (strEncrypt != NULL)
delete strEncrypt;
if (strDecrypt != NULL)
delete strDecrypt;
EndDialog(hwnd, 0);
break;
default:
break;
}
}
break;
default:
break;
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstThis, HINSTANCE hInstPrev, LPSTR strCmd, int showCmd)
{
DialogBox(hInstThis, MAKEINTRESOURCE(IDD_RSADLG), 0, (DLGPROC)RSADlgProc);
}
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