我试图创建一个对licenseCheck功能具有篡改保护的基本程序,但它总是说它是正确的,即使我在Ollydbg中删除整个licenseCheck功能或更改并重建代码
我正在关注Surreptitious Software一书,并编写了以下程序:
#include "stdafx.h"
#define HASH 5131241
void BEGIN() {}
const std::string correctlicense("ABC");
bool licenseCheck() {
std::cout << "Enter license: ";
std::string license;
std::cin >> license;
volatile DWORD d;
// Fingerprint
__asm {
lea ebx, d
mov ebx, 0x050b072b
}
return license.compare(correctlicense) == 0;
}
UINT hash(UINT *beginAddress, UINT *endAddress) {
UINT h = *beginAddress;
for (; beginAddress <= endAddress; beginAddress++) {
h ^= *beginAddress;
}
return h;
}
void END() {}
int main()
{
UINT uHash = hash((UINT*)BEGIN, (UINT*)END);
std::cout << "[Protection checks]" << std::endl;
std::cout << "Tampering: ";
if (uHash != HASH) {
std::cout << "Tampering detected! ( " << uHash << " )" << std::endl;
system("PAUSE");
return 0;
}
else {
std::cout << "Correct" << std::endl;
}
if (licenseCheck()) {
std::cout << "Correct!" << std::endl;
}
else {
std::cout << "Failed!" << std::endl;
}
system("PAUSE");
return 0;
}
该程序基本上是哈希&#39; BEGIN函数和END函数之间的代码,但它似乎不起作用。即使在篡改之后,哈希仍然是正确的。
我使用Windows 7和Visual Studio 2017构建/运行程序。