crackme.chm之figugegl_3

    使用Resource Hacker+IDA定位程序验证逻辑，不熟悉的可以看我逆向技巧栏目相关文章。按下F5分析，可以得出等价伪代码以及对应注册算法如下

#include <iostream>
using namespace std;

/*int main(HWND hWnd)
{
  int result; // eax@3
  char szSerial[33]; // [sp+Eh] [bp-42h]@1
  char szName[33]; // [sp+2Fh] [bp-21h]@1
  char szCipherText[] = "203945709398475029384750293875577934765620110289347563929867122287863095762304984875020398746563";

  int iSLen = GetDlgItemTextA(hWnd, 102, szSerial, 32);
  int iNLen = GetDlgItemTextA(hWnd, 101, szName, 32);
  if ( iSLen==iNLen && iNLen>=4)
  {
    for (int i=0; i<iNLen; ++i)
    {
      if (szSerial[i] != szCipherText[szName[i]-32])
      {
        MessageBoxA(hWnd, off_40204C, off_402048, 0);
        return 0;
      }
    }
    MessageBoxA(hWnd, off_40203C, off_402038, 0);
    result = 1;
  }
  else
  {
    MessageBoxA(hWnd, lpText, lpCaption, 0);
    result = 0;
  }
  return result;
}*/

void main()
{
	char szSerial[5] = {'\0'};
	char szName[] = "@@@@";
	char szCipherText[] = "203945709398475029384750293875577934765620110289347563929867122287863095762304984875020398746563";
	
	for (int i=0; i<4; ++i)
		szSerial[i] = szCipherText[szName[i]-32];
	cout<<"The Serial:"<<szSerial<<endl;
}