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LICENSE
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21
LICENSE
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MIT License
|
||||
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Copyright (c) 2023 rlaphoenix
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Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in all
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||||
copies or substantial portions of the Software.
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||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
SOFTWARE.
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||||
BIN
ModKey2Key.rc
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BIN
ModKey2Key.rc
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41
ModKey2Key.sln
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41
ModKey2Key.sln
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35
README.md
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README.md
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# Streamfab
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# ModKey2Key
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Simple C++ library to decrypt ModKey values used to authorize StreamFab API requests.
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## Background
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The team behind DVDFab, a software that does everything you could imagine with DVDs and Blu-rays, later released a new tool called StreamFab.
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StreamFab lets you download online videos that are protected by DRM from places like Netflix, Prime Video, Disney+, Hulu, and more.
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It worked by sending video and audio decryption jobs to an API they control. Their API would internally send a Widevine license request to the
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relevant streaming platform to obtain the video and audio decryption keys. These keys would then be sent back by the API to the StreamFab client
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for decryption.
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The DVDFab team did not want to allow their API to be used by other software or groups, understandably so it cannot be abused, overused, or re-sold.
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The API would ask for a certain key to be provided during API calls as authorization.
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## So, how was the API authorized?
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I don't fully remember anymore, as this project was written years before I created this README.
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However, generally from what I remember, at a high level, it would send you a relatively large amount of data.
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This data contained various information including an 'encrypted' key. These were referred to as 'modkeys'.
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## How was it reversed?
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This was relatively trivial to reverse engineer, thanks to the DVDFab team making a large mistake in one of the
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StreamFab releases. One of them had way less obfuscation then it typically has, including no virtualization or
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any kind of anti-debugging tricks. It had some obfuscation, but very very little.
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Because the encryption/decryption algorithm used is a typicall memory jumping bitwise operation, translating the code to another language was not possible.
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This is why I made it as a DLL that could be easily imported and used by other software, even Python 64-bit.
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Simply pass the ModKey to the `modkey2key` function, and voila it returns the real key you can use to authorize StreamFab API requests and decrypt responses.
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I simply took the function from the StreamFab.exe client, looked for the relevant function, had ghidra generate pseudocode, and made small changes to rework
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it as a new project in Visual Studio as a library. I also had to make some small changes to do with memory addressing to operate correctly when compiled as
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a 64-bit library.
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140
libModKey2Key/dllmain.cpp
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libModKey2Key/dllmain.cpp
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#define _CRT_SECURE_NO_WARNINGS
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#include <iostream>
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#include <string.h>
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#include "dllmain.h"
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typedef unsigned long long undefined8;
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typedef unsigned long undefined4;
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typedef unsigned char undefined;
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typedef unsigned char byte;
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typedef unsigned long ulong;
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typedef unsigned int uint;
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void hex_to_bytes(char* input, char* output, ulong buffer_size) {
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/*
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Hex to Bytes -- Returned as char* (0-255)
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Parameters:
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input: Input hex string data
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output: Output bytes buffer
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buffer_size: Output buffer size
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*/
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size_t len;
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ulong i;
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len = strlen(input);
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if (len + 1 >> 1 <= buffer_size) {
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for (i = 0; i < len; i = i + 2) {
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sscanf(input + i, "%2hhx", output + (i >> 1));
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}
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}
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return;
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}
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void bytes_to_hex(char* input, char* output, ulong buffer_size) {
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ulong i;
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for (i = 0; i < buffer_size; i = i + 1) {
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sprintf((char*)(output + i * 2), "%02x", (ulong) * (byte*)(input + i));
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}
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return;
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}
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void _modkey2key(uint* mod, uint* tok) {
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/* Secure function to undo modifications to "mod" key (In-place). */
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// - when doing pointer arithmetic, make sure to use (long long) and not (long) as we
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// are compiling for a 64-bit platform, not 32-bit.
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long local_50;
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long local_48;
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byte local_31;
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byte local_30;
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byte local_2f;
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short local_2e;
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uint local_28;
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uint local_24;
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int local_20;
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int local_1c;
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short local_18;
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byte local_15;
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int i;
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uint tok_xor = *tok ^ 0x2a2e3706;
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uint mod_deref = *mod;
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for (i = 1; i <= 3; i = i + 1) {
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tok_xor = tok_xor ^ mod_deref;
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local_2e = (short)(tok_xor >> 0x10);
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local_18 = (short)tok_xor;
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local_2f = (byte)(tok_xor >> 0x10);
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local_30 = (byte)(local_2e >> 5) & 0x1f;
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local_31 = (byte)((int)tok_xor >> 0x1a);
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tok[i] = tok[i] << (-local_31 & 0x1f) | tok[i] >> (local_31 & 0x1f);
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tok_xor = (int)(local_2e >> 0xf) ^
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(tok_xor >> (local_2f & 0x1f) | tok_xor << (-local_2f & 0x1f)) ^
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tok[i];
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byte t_l = *(byte*)((long long)&tok_xor + (tok[i] - i & 3)) >> 3;
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byte t_r = -(*(byte*)((long long)&tok_xor + (tok[i] - i & 3)) >> 3) & 0x1f;
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mod[i] = mod[i] << t_l | mod[i] >> t_r;
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for (local_20 = 0; local_20 < 4; local_20 = local_20 + 1) {
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local_15 = 0;
|
||||
for (local_1c = 0; local_1c < 4; local_1c = local_1c + 1) {
|
||||
if ((int)((int)local_18 & 3U) < local_1c) {
|
||||
local_24 = 0xff;
|
||||
}
|
||||
else {
|
||||
local_24 = (uint) * (byte*)((long long)&tok_xor + (ulong)(local_1c + local_20 & 3));
|
||||
}
|
||||
local_15 = local_15 ^ (byte)local_24;
|
||||
}
|
||||
for (local_1c = 0; local_1c < 4; local_1c = local_1c + 1) {
|
||||
if ((int)((int)(local_18 >> 2) & 3U) < local_1c) {
|
||||
local_28 = 0xff;
|
||||
}
|
||||
else {
|
||||
local_28 = (uint)local_15;
|
||||
}
|
||||
*(byte*)((long long)mod + (int)(i * 4 + (local_1c + local_20 & 3U))) =
|
||||
*(byte*)((long long)mod + (int)(i * 4 + (local_1c + local_20 & 3U))) ^
|
||||
(byte)local_28;
|
||||
}
|
||||
local_18 = local_18 >> 4;
|
||||
}
|
||||
mod_deref = mod[i];
|
||||
local_50 = (long)i;
|
||||
mod[i] = mod[i] << local_30 | mod[i] >> (-local_30 & 0x1f);
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
char* modkey2key(char* mod, char* tok) {
|
||||
size_t key_len;
|
||||
char key[32];
|
||||
char mod_bytes[16];
|
||||
char tok_bytes[16];
|
||||
char* key_buffer;
|
||||
|
||||
hex_to_bytes(mod, mod_bytes, 0x10);
|
||||
hex_to_bytes(tok, tok_bytes, 0x10);
|
||||
|
||||
_modkey2key((uint*)&mod_bytes, (uint*)&tok_bytes);
|
||||
|
||||
bytes_to_hex(mod_bytes, key, 0x10);
|
||||
|
||||
// copy key to new buffer as `key` is allocated on the func stack
|
||||
// it would get cleared on return if we don't do this
|
||||
key_len = strlen(key);
|
||||
key_buffer = (char*)malloc(key_len + 1); // +1 for null terminator
|
||||
strcpy(key_buffer, key);
|
||||
|
||||
//std::cout << key << std::endl;
|
||||
|
||||
return key;
|
||||
}
|
||||
24
libModKey2Key/dllmain.h
Normal file
24
libModKey2Key/dllmain.h
Normal file
@ -0,0 +1,24 @@
|
||||
#ifndef MY_LIBRARY_H
|
||||
#define MY_LIBRARY_H
|
||||
#define _CRT_SECURE_NO_WARNINGS
|
||||
|
||||
#include <iostream>
|
||||
#include <cstring>
|
||||
#include <stdio.h>
|
||||
|
||||
typedef unsigned long long undefined8;
|
||||
typedef unsigned long undefined4;
|
||||
typedef unsigned char undefined;
|
||||
typedef unsigned char byte;
|
||||
typedef unsigned long ulong;
|
||||
typedef unsigned int uint;
|
||||
|
||||
void hex_to_bytes(char* input, char* output, ulong buffer_size);
|
||||
|
||||
void bytes_to_hex(char* input, char* output, ulong buffer_size);
|
||||
|
||||
void _modkey2key(uint* mod, uint* tok);
|
||||
|
||||
extern "C" __declspec(dllexport) char* modkey2key(char* mod, char* tok);
|
||||
|
||||
#endif
|
||||
5
libModKey2Key/framework.h
Normal file
5
libModKey2Key/framework.h
Normal file
@ -0,0 +1,5 @@
|
||||
#pragma once
|
||||
|
||||
#define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers
|
||||
// Windows Header Files
|
||||
#include <windows.h>
|
||||
BIN
libModKey2Key/libModKey2Key.aps
Normal file
BIN
libModKey2Key/libModKey2Key.aps
Normal file
Binary file not shown.
BIN
libModKey2Key/libModKey2Key.rc
Normal file
BIN
libModKey2Key/libModKey2Key.rc
Normal file
Binary file not shown.
155
libModKey2Key/libModKey2Key.vcxproj
Normal file
155
libModKey2Key/libModKey2Key.vcxproj
Normal file
@ -0,0 +1,155 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||
<ItemGroup Label="ProjectConfigurations">
|
||||
<ProjectConfiguration Include="Debug|Win32">
|
||||
<Configuration>Debug</Configuration>
|
||||
<Platform>Win32</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Release|Win32">
|
||||
<Configuration>Release</Configuration>
|
||||
<Platform>Win32</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Debug|x64">
|
||||
<Configuration>Debug</Configuration>
|
||||
<Platform>x64</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Release|x64">
|
||||
<Configuration>Release</Configuration>
|
||||
<Platform>x64</Platform>
|
||||
</ProjectConfiguration>
|
||||
</ItemGroup>
|
||||
<PropertyGroup Label="Globals">
|
||||
<VCProjectVersion>16.0</VCProjectVersion>
|
||||
<Keyword>Win32Proj</Keyword>
|
||||
<ProjectGuid>{aed2c517-bb61-4ca0-9364-d1245f281878}</ProjectGuid>
|
||||
<RootNamespace>libModKey2Key</RootNamespace>
|
||||
<WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
|
||||
</PropertyGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<UseDebugLibraries>true</UseDebugLibraries>
|
||||
<PlatformToolset>v143</PlatformToolset>
|
||||
<CharacterSet>Unicode</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<UseDebugLibraries>false</UseDebugLibraries>
|
||||
<PlatformToolset>v143</PlatformToolset>
|
||||
<WholeProgramOptimization>true</WholeProgramOptimization>
|
||||
<CharacterSet>Unicode</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<UseDebugLibraries>true</UseDebugLibraries>
|
||||
<PlatformToolset>v143</PlatformToolset>
|
||||
<CharacterSet>Unicode</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
|
||||
<ConfigurationType>DynamicLibrary</ConfigurationType>
|
||||
<UseDebugLibraries>false</UseDebugLibraries>
|
||||
<PlatformToolset>v143</PlatformToolset>
|
||||
<WholeProgramOptimization>true</WholeProgramOptimization>
|
||||
<CharacterSet>Unicode</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
|
||||
<ImportGroup Label="ExtensionSettings">
|
||||
</ImportGroup>
|
||||
<ImportGroup Label="Shared">
|
||||
</ImportGroup>
|
||||
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
</ImportGroup>
|
||||
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
</ImportGroup>
|
||||
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
</ImportGroup>
|
||||
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
</ImportGroup>
|
||||
<PropertyGroup Label="UserMacros" />
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
|
||||
<ClCompile>
|
||||
<WarningLevel>Level3</WarningLevel>
|
||||
<SDLCheck>true</SDLCheck>
|
||||
<PreprocessorDefinitions>WIN32;_DEBUG;LIBMODKEY2KEY_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<ConformanceMode>true</ConformanceMode>
|
||||
<PrecompiledHeader>Use</PrecompiledHeader>
|
||||
<PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<EnableUAC>false</EnableUAC>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
|
||||
<ClCompile>
|
||||
<WarningLevel>Level3</WarningLevel>
|
||||
<FunctionLevelLinking>true</FunctionLevelLinking>
|
||||
<IntrinsicFunctions>true</IntrinsicFunctions>
|
||||
<SDLCheck>true</SDLCheck>
|
||||
<PreprocessorDefinitions>WIN32;NDEBUG;LIBMODKEY2KEY_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<ConformanceMode>true</ConformanceMode>
|
||||
<PrecompiledHeader>Use</PrecompiledHeader>
|
||||
<PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<EnableCOMDATFolding>true</EnableCOMDATFolding>
|
||||
<OptimizeReferences>true</OptimizeReferences>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<EnableUAC>false</EnableUAC>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
|
||||
<ClCompile>
|
||||
<WarningLevel>Level3</WarningLevel>
|
||||
<SDLCheck>true</SDLCheck>
|
||||
<PreprocessorDefinitions>_DEBUG;LIBMODKEY2KEY_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<ConformanceMode>true</ConformanceMode>
|
||||
<PrecompiledHeader>Use</PrecompiledHeader>
|
||||
<PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<EnableUAC>false</EnableUAC>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
|
||||
<ClCompile>
|
||||
<WarningLevel>Level3</WarningLevel>
|
||||
<FunctionLevelLinking>true</FunctionLevelLinking>
|
||||
<IntrinsicFunctions>true</IntrinsicFunctions>
|
||||
<SDLCheck>true</SDLCheck>
|
||||
<PreprocessorDefinitions>NDEBUG;LIBMODKEY2KEY_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
<ConformanceMode>true</ConformanceMode>
|
||||
<PrecompiledHeader>NotUsing</PrecompiledHeader>
|
||||
<PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<SubSystem>Windows</SubSystem>
|
||||
<EnableCOMDATFolding>true</EnableCOMDATFolding>
|
||||
<OptimizeReferences>true</OptimizeReferences>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<EnableUAC>false</EnableUAC>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemGroup>
|
||||
<ClInclude Include="dllmain.h" />
|
||||
<ClInclude Include="framework.h" />
|
||||
<ClInclude Include="resource.h" />
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClCompile Include="dllmain.cpp" />
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ResourceCompile Include="libModKey2Key.rc" />
|
||||
</ItemGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
|
||||
<ImportGroup Label="ExtensionTargets">
|
||||
</ImportGroup>
|
||||
</Project>
|
||||
38
libModKey2Key/libModKey2Key.vcxproj.filters
Normal file
38
libModKey2Key/libModKey2Key.vcxproj.filters
Normal file
@ -0,0 +1,38 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||
<ItemGroup>
|
||||
<Filter Include="Source Files">
|
||||
<UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
|
||||
<Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
|
||||
</Filter>
|
||||
<Filter Include="Header Files">
|
||||
<UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
|
||||
<Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
|
||||
</Filter>
|
||||
<Filter Include="Resource Files">
|
||||
<UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
|
||||
<Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
|
||||
</Filter>
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClInclude Include="framework.h">
|
||||
<Filter>Header Files</Filter>
|
||||
</ClInclude>
|
||||
<ClInclude Include="dllmain.h">
|
||||
<Filter>Header Files</Filter>
|
||||
</ClInclude>
|
||||
<ClInclude Include="resource.h">
|
||||
<Filter>Header Files</Filter>
|
||||
</ClInclude>
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClCompile Include="dllmain.cpp">
|
||||
<Filter>Source Files</Filter>
|
||||
</ClCompile>
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ResourceCompile Include="libModKey2Key.rc">
|
||||
<Filter>Resource Files</Filter>
|
||||
</ResourceCompile>
|
||||
</ItemGroup>
|
||||
</Project>
|
||||
4
libModKey2Key/libModKey2Key.vcxproj.user
Normal file
4
libModKey2Key/libModKey2Key.vcxproj.user
Normal file
@ -0,0 +1,4 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||
<PropertyGroup />
|
||||
</Project>
|
||||
14
libModKey2Key/resource.h
Normal file
14
libModKey2Key/resource.h
Normal file
@ -0,0 +1,14 @@
|
||||
//{{NO_DEPENDENCIES}}
|
||||
// Microsoft Visual C++ generated include file.
|
||||
// Used by libModKey2Key.rc
|
||||
|
||||
// Next default values for new objects
|
||||
//
|
||||
#ifdef APSTUDIO_INVOKED
|
||||
#ifndef APSTUDIO_READONLY_SYMBOLS
|
||||
#define _APS_NEXT_RESOURCE_VALUE 101
|
||||
#define _APS_NEXT_COMMAND_VALUE 40001
|
||||
#define _APS_NEXT_CONTROL_VALUE 1001
|
||||
#define _APS_NEXT_SYMED_VALUE 101
|
||||
#endif
|
||||
#endif
|
||||
155
main.cpp
Normal file
155
main.cpp
Normal file
@ -0,0 +1,155 @@
|
||||
// Online C++ compiler to run C++ program online
|
||||
#define _CRT_SECURE_NO_WARNINGS
|
||||
#include <iostream>
|
||||
#include <string.h>
|
||||
|
||||
|
||||
typedef unsigned long long undefined8;
|
||||
typedef unsigned long undefined4;
|
||||
typedef unsigned char undefined;
|
||||
typedef unsigned char byte;
|
||||
typedef unsigned long ulong;
|
||||
typedef unsigned int uint;
|
||||
|
||||
|
||||
void hex_to_bytes(char* input, char* output, ulong buffer_size) {
|
||||
/*
|
||||
Hex to Bytes -- Returned as char* (0-255)
|
||||
|
||||
Parameters:
|
||||
input: Input hex string data
|
||||
output: Output bytes buffer
|
||||
buffer_size: Output buffer size
|
||||
*/
|
||||
size_t len;
|
||||
ulong i;
|
||||
|
||||
len = strlen(input);
|
||||
if (len + 1 >> 1 <= buffer_size) {
|
||||
for (i = 0; i < len; i = i + 2) {
|
||||
sscanf(input + i, "%2hhx", output + (i >> 1));
|
||||
}
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
void bytes_to_hex(char* input, char* output, ulong buffer_size) {
|
||||
ulong i;
|
||||
|
||||
for (i = 0; i < buffer_size; i = i + 1) {
|
||||
sprintf((char*)(output + i * 2), "%02x", (ulong) * (byte*)(input + i));
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
void _modkey2key(uint* mod, uint* tok) {
|
||||
/* Secure function to undo modifications to "mod" key (In-place). */
|
||||
// - when doing pointer arithmetic, make sure to use (long long) and not (long) as we
|
||||
// are compiling for a 64-bit platform, not 32-bit.
|
||||
long local_50;
|
||||
long local_48;
|
||||
byte local_31;
|
||||
byte local_30;
|
||||
byte local_2f;
|
||||
short local_2e;
|
||||
uint local_28;
|
||||
uint local_24;
|
||||
int local_20;
|
||||
int local_1c;
|
||||
short local_18;
|
||||
byte local_15;
|
||||
|
||||
int i;
|
||||
uint tok_xor = *tok ^ 0x2a2e3706;
|
||||
uint mod_deref = *mod;
|
||||
|
||||
for (i = 1; i <= 3; i = i + 1) {
|
||||
tok_xor = tok_xor ^ mod_deref;
|
||||
|
||||
local_2e = (short)(tok_xor >> 0x10);
|
||||
local_18 = (short)tok_xor;
|
||||
local_2f = (byte)(tok_xor >> 0x10);
|
||||
local_30 = (byte)(local_2e >> 5) & 0x1f;
|
||||
local_31 = (byte)((int)tok_xor >> 0x1a);
|
||||
|
||||
tok[i] = tok[i] << (-local_31 & 0x1f) | tok[i] >> (local_31 & 0x1f);
|
||||
tok_xor = (int)(local_2e >> 0xf) ^
|
||||
(tok_xor >> (local_2f & 0x1f) | tok_xor << (-local_2f & 0x1f)) ^
|
||||
tok[i];
|
||||
|
||||
byte t_l = *(byte*)((long long)&tok_xor + (tok[i] - i & 3)) >> 3;
|
||||
byte t_r = -(*(byte*)((long long)&tok_xor + (tok[i] - i & 3)) >> 3) & 0x1f;
|
||||
mod[i] = mod[i] << t_l | mod[i] >> t_r;
|
||||
|
||||
for (local_20 = 0; local_20 < 4; local_20 = local_20 + 1) {
|
||||
local_15 = 0;
|
||||
for (local_1c = 0; local_1c < 4; local_1c = local_1c + 1) {
|
||||
if ((int)((int)local_18 & 3U) < local_1c) {
|
||||
local_24 = 0xff;
|
||||
}
|
||||
else {
|
||||
local_24 = (uint) * (byte*)((long long)&tok_xor + (ulong)(local_1c + local_20 & 3));
|
||||
}
|
||||
local_15 = local_15 ^ (byte)local_24;
|
||||
}
|
||||
for (local_1c = 0; local_1c < 4; local_1c = local_1c + 1) {
|
||||
if ((int)((int)(local_18 >> 2) & 3U) < local_1c) {
|
||||
local_28 = 0xff;
|
||||
}
|
||||
else {
|
||||
local_28 = (uint)local_15;
|
||||
}
|
||||
*(byte*)((long long)mod + (int)(i * 4 + (local_1c + local_20 & 3U))) =
|
||||
*(byte*)((long long)mod + (int)(i * 4 + (local_1c + local_20 & 3U))) ^
|
||||
(byte)local_28;
|
||||
}
|
||||
local_18 = local_18 >> 4;
|
||||
}
|
||||
mod_deref = mod[i];
|
||||
local_50 = (long)i;
|
||||
mod[i] = mod[i] << local_30 | mod[i] >> (-local_30 & 0x1f);
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
char* modkey2key(char* mod, char* tok) {
|
||||
size_t key_len;
|
||||
char key[32];
|
||||
char mod_bytes[16];
|
||||
char tok_bytes[16];
|
||||
char* key_buffer;
|
||||
|
||||
hex_to_bytes(mod, mod_bytes, 0x10);
|
||||
hex_to_bytes(tok, tok_bytes, 0x10);
|
||||
|
||||
_modkey2key((uint*)&mod_bytes, (uint*)&tok_bytes);
|
||||
|
||||
bytes_to_hex(mod_bytes, key, 0x10);
|
||||
|
||||
// copy key to new buffer as `key` is allocated on the func stack
|
||||
// it would get cleared on return if we don't do this
|
||||
key_len = strlen(key);
|
||||
key_buffer = (char*)malloc(key_len + 1); // +1 for null terminator
|
||||
strcpy(key_buffer, key);
|
||||
|
||||
return key_buffer;
|
||||
}
|
||||
|
||||
int main(int argc, char* argv[]) {
|
||||
//char mod[] = "dadcf4783dd85c97bcf1d7b90cc55d51";
|
||||
//char tok[] = "cab66d47305016a723586c4778c0b521";
|
||||
char* mod = argv[1];
|
||||
char* tok = argv[2];
|
||||
|
||||
//std::cout << "mod: " << mod << std::endl;
|
||||
//std::cout << "tok: " << tok << std::endl;
|
||||
|
||||
char* key = modkey2key(mod, tok);
|
||||
|
||||
std::cout << key << std::endl;
|
||||
// key == "dadcf478e4a50085f22bb673864b0ae9"
|
||||
|
||||
return 0;
|
||||
}
|
||||
16
resource.h
Normal file
16
resource.h
Normal file
@ -0,0 +1,16 @@
|
||||
//{{NO_DEPENDENCIES}}
|
||||
// Microsoft Visual C++ generated include file.
|
||||
// Used by ModKey2Key.rc
|
||||
//
|
||||
#define IDI_ICON1 101
|
||||
|
||||
// Next default values for new objects
|
||||
//
|
||||
#ifdef APSTUDIO_INVOKED
|
||||
#ifndef APSTUDIO_READONLY_SYMBOLS
|
||||
#define _APS_NEXT_RESOURCE_VALUE 102
|
||||
#define _APS_NEXT_COMMAND_VALUE 40001
|
||||
#define _APS_NEXT_CONTROL_VALUE 1001
|
||||
#define _APS_NEXT_SYMED_VALUE 101
|
||||
#endif
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user