s0x's 4-Stage

Author:
s0x

Language:
C/C++

Upload:
2026-01-14 01:26

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Platform:
Windows

Difficulty:
3.5

Quality:
4.8

Arch:
x86-64

Downloads:
706

Size:
222.00 KB

Writeups:
1

Comments:
3

Description

Password is 8 characters long and made up of 4 stages, each using a different transformation.

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s0x on 2026-01-14 12:54: [Click to reveal]

lanc3r on 2026-01-15 14:24: [Click to reveal]

FTSyxcal on 2026-03-01 18:42: [Click to reveal]#include <iostream> #include <string> #include <cstdlib> #include <cerrno> #include <cstdint> uint16_t g_consoleModeFlags; uint16_t g_consoleMask; uint8_t stage1(const std::string& pass) { std::string sub = pass.substr(0, 2); char* end; errno = 0; long val = strtol(sub.c_str(), &end, 10); uint8_t b = (uint8_t)val; return (b << 7) | (b >> 1); } int16_t stage2(const std::string& pass) { char buf[2] = { pass[2], pass[3] }; for (int i = 0; i < 2; i++) { buf[i] = (buf[i] ^ (i * 7)) + i; } return *(int16_t*)buf; } uint16_t stage3(const std::string& pass) { uint8_t b0 = pass[4], b1 = pass[5]; uint16_t val = ((uint16_t)b1 << 7) | (b0 >> 1); return val & g_consoleMask; } int16_t stage4(const std::string& pass) { uint8_t b0 = pass[6]; uint8_t b1 = pass[7] ^ 0x5A; uint8_t high = (b1 << 2) | (b1 >> 6); uint8_t low = ((b0 + 3) * 2) | ((int8_t)(b0 + 3) < 0 ? 1 : 0); return (int16_t)((high << 8) | low); } bool checkPassword(const std::string& pass) { if (pass.size() != 8) { std::cout << "Password must be 8 characters long!\n"; return false; } if (stage1(pass) != 0x1E) { std::cout << "Stage 1 failed\n"; return false; } if (stage2(pass) != 0x646f) { std::cout << "Stage 2 failed\n"; return false; } if (stage3(pass) != g_consoleMask) { std::cout << "Stage 3 failed\n"; return false; } if (stage4(pass) != (int16_t)0xEDCA) { std::cout << "Stage 4 failed\n"; return false; } return true; } int main() { while (true) { std::cout << "Enter password: "; std::string input; std::cin >> input; if (checkPassword(input)) { std::cout << "Password IS Correct!\n"; } else { std::cout << "Password Is NOT Correct!\n"; } } return 0; }

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Solution by Ploxied on 2026-01-15 12:28:

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crackmes.one

crackmes.one

s0x's 4-Stage