做看雪的crackme才看出差距,包含的东西比别的多。
这个ck没别的,用代码校验和来做反调试,于是下硬件断点,直接还原上代码
// Reverse11.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include "windows.h" int _tmain(int argc, _TCHAR* argv[]) { char username[30] = { 0 }; char password[30] = { 0 }; scanf_s("%s", username, 30); scanf_s("%s", password, 30); BYTE v1 = 0; BYTE v2 = 0; char str[] = "ZWATRQLCGHPSXYENVBJDFKMU"; if (password[1] != ‘E‘ || strlen(password) != 0xa) { printf_s("wrong"); system("pause"); return 0; } for (int i = 0; i < strlen(password); i++) { if (password[i]<‘A‘ || password[i]>‘Z‘) { printf_s("wrong"); system("pause"); return 0; } } int temp1 = 0; for (int i = 0; i < strlen(username); i++) { temp1 += username[i]; } v1 = temp1 % 0x18; int temp2 = 0; for (int i = 0; i < 9; i++) { temp2 += password[i]; } v2 = temp2 / 0x9; if (v1 > 0x18) v1 -= 0x18; if (password[0] != str[v1]) { printf_s("wrong"); system("pause"); return 0; } BYTE v3 = v1 + (v1 + 0x18); if (v3 > 0x18) v3 -= 0x18; if (password[2] != str[v3]) { printf_s("wrong"); system("pause"); return 0; } for (int i = 2; i < 8; i++) { v1 -= 0x41; v3 += v1; if (v3 > 0x18) v3 -= 0x18; if (password[i] != str[v3]) { printf_s("wrong"); system("pause"); return 0; } } if (v2 == password[9]) { printf_s("right"); system("pause"); return 0; } return 0; }
时间: 2024-08-10 23:21:49