Added DecryptGIF for Flare-On 6 challenge 10 "Mugatu"

HomeSen · Oct 20, 2019 · 3b48512 · 3b48512
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diff --git a/Flare-On 6/10 - Mugatu/DecryptGIF/DecryptGIF.c b/Flare-On 6/10 - Mugatu/DecryptGIF/DecryptGIF.c
@@ -0,0 +1,157 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <memory.h>
+#include <stdint.h>
+
+void decipher(unsigned long *const v, unsigned long *const w, const unsigned long *const k)
+{
+	register unsigned long       y = v[0], z = v[1], sum = 0xC6EF3720,
+		delta = 0x9E3779B9, a = k[0], b = k[1], c = k[2],
+		d = k[3], n = 32;
+
+	/* sum = delta<<5, in general sum = delta * n */
+
+	while (n-- > 0)
+	{
+		z -= (y << 4) + c ^ y + sum ^ (y >> 5) + d;
+		y -= (z << 4) + a ^ z + sum ^ (z >> 5) + b;
+		sum -= delta;
+	}
+
+	w[0] = y; w[1] = z;
+}
+
+void decryptData(unsigned int rounds, uint32_t v[2], uint32_t const k[4])
+{
+	uint32_t v0, v1;
+	uint32_t sum;
+	const uint32_t delta = 0x9E3779B9;
+
+	v0 = v[0];
+	v1 = v[1];
+	sum = delta * rounds;
+	do {
+		v1 -= ((((v0 << 4) ^ (v0 >> 5)) + v0) ^ (k[(sum >> 0xb) & 3] + sum));
+		sum -= delta;
+		v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (k[sum & 3] + sum);
+
+		rounds--;
+	} while (rounds != 0);
+	v[0] = v0;
+	v[1] = v1;
+
+	return;
+}
+
+void long_to_string(uint32_t v[2], unsigned char buffer[8])
+{
+	buffer[0] = (v[0] >> 0) & 0xff;
+	buffer[1] = (v[0] >> 8) & 0xff;
+	buffer[2] = (v[0] >> 16) & 0xff;
+	buffer[3] = (v[0] >> 24) & 0xff;
+	buffer[4] = (v[1] >> 0) & 0xff;
+	buffer[5] = (v[1] >> 8) & 0xff;
+	buffer[6] = (v[1] >> 16) & 0xff;
+	buffer[7] = (v[1] >> 24) & 0xff;
+}
+
+int findKey(unsigned char *buffer, uint32_t k[4])
+{
+	unsigned char result[8];
+	char *target = "GIF8";
+	int found = 0;
+	uint32_t v[2];
+
+	while (found == 0)
+	{
+		for (k[0]=0x31; k[0] < 256; k[0]++)
+		{
+			for (k[1]=0x73; k[1] < 256; k[1]++)
+			{
+				for (k[2]=0x35; k[2] < 256; k[2]++)
+				{
+					for (k[3]=0xb1; k[3] < 256; k[3]++)
+					{
+						v[0] = (buffer[3] << 24) | (buffer[2] << 16) | (buffer[1] << 8) | buffer[0];
+						v[1] = (buffer[7] << 24) | (buffer[6] << 16) | (buffer[5] << 8) | buffer[4];
+
+						//decipher(v, v, k);
+						decryptData(32, v, k);
+						long_to_string(v, result);
+						found = 1;
+						for (int i = 0; i < 4; i++)
+						{
+							if (result[i] != target[i])
+							{
+								found = 0;
+								break;
+							}
+						}
+						if (found == 1)
+							break;
+					}
+					if (found == 1)
+						break;
+				}
+				if (found == 1)
+					break;
+			}
+			if (found == 1)
+				break;
+		}
+	}
+
+	return found;
+}
+
+int main(int argc, char *argv[])
+{
+	if (argc != 3)
+	{
+		printf("Usage: %s input_file output_file\n", argv[0]);
+		return 1;
+	}
+
+	unsigned char buffer[8];
+	uint32_t v[2];
+	uint32_t key[4];
+
+	FILE *hInputFile, *hOutputFile;
+	fopen_s(&hInputFile, argv[1], "rb");
+
+	fread(buffer, sizeof(buffer), 1, hInputFile);
+	if (findKey(buffer, key) == 0)
+	{
+		printf("Failed to find key!\n");
+		fclose(hInputFile);
+		return 2;
+	}
+
+	printf("Found key: ");
+	for (int i = 0; i < 4; i++)
+		printf("%08x", key[i]);
+	printf("\n");
+	fseek(hInputFile, 0, 0);
+
+	//key[0] = 0x31;
+	//key[1] = 0x73;
+	//key[2] = 0x35;
+	//key[3] = 0xb1;
+	fopen_s(&hOutputFile, argv[2], "wb");
+	do
+	{
+		memset(buffer, 0, sizeof(buffer));
+		fread(buffer, sizeof(buffer), 1, hInputFile);
+		v[0] = (buffer[3] << 24) | (buffer[2] << 16) | (buffer[1] << 8) | buffer[0];
+		v[1] = (buffer[7] << 24) | (buffer[6] << 16) | (buffer[5] << 8) | buffer[4];
+		//decipher(v, v, k);
+		decryptData(32, v, key);
+		long_to_string(v, buffer);
+		fwrite(buffer, sizeof(buffer), 1, hOutputFile);
+	} while (!feof(hInputFile));
+
+	fclose(hInputFile);
+	fclose(hOutputFile);
+
+	return 0;
+}
diff --git a/Flare-On 6/10 - Mugatu/DecryptGIF/DecryptGIF.sln b/Flare-On 6/10 - Mugatu/DecryptGIF/DecryptGIF.sln
@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Express 15 for Windows Desktop
+VisualStudioVersion = 15.0.28307.572
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "DecryptGIF", "DecryptGIF.vcxproj", "{82B0A257-B26F-40FD-8658-166D844667A9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{82B0A257-B26F-40FD-8658-166D844667A9}.Debug|x64.ActiveCfg = Debug|x64
+		{82B0A257-B26F-40FD-8658-166D844667A9}.Debug|x64.Build.0 = Debug|x64
+		{82B0A257-B26F-40FD-8658-166D844667A9}.Debug|x86.ActiveCfg = Debug|Win32
+		{82B0A257-B26F-40FD-8658-166D844667A9}.Debug|x86.Build.0 = Debug|Win32
+		{82B0A257-B26F-40FD-8658-166D844667A9}.Release|x64.ActiveCfg = Release|x64
+		{82B0A257-B26F-40FD-8658-166D844667A9}.Release|x64.Build.0 = Release|x64
+		{82B0A257-B26F-40FD-8658-166D844667A9}.Release|x86.ActiveCfg = Release|Win32
+		{82B0A257-B26F-40FD-8658-166D844667A9}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1A871118-36A7-462B-B9F1-B398F180D340}
+	EndGlobalSection
+EndGlobal
diff --git a/Flare-On 6/10 - Mugatu/DecryptGIF/DecryptGIF.vcxproj b/Flare-On 6/10 - Mugatu/DecryptGIF/DecryptGIF.vcxproj
@@ -0,0 +1,161 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" 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>15.0</VCProjectVersion>
+    <ProjectGuid>{82B0A257-B26F-40FD-8658-166D844667A9}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>DecryptGIF</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0.17763.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
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+    <CharacterSet>Unicode</CharacterSet>
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+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
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+    <PlatformToolset>v141</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
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+    <ConfigurationType>Application</ConfigurationType>
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+    <PlatformToolset>v141</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
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+  <ImportGroup Label="ExtensionSettings">
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+    <LinkIncremental>true</LinkIncremental>
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+  </PropertyGroup>
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+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <DisableLanguageExtensions>true</DisableLanguageExtensions>
+      <CompileAs>CompileAsC</CompileAs>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
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+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
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+    <ClCompile>
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+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <DisableLanguageExtensions>true</DisableLanguageExtensions>
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+    <Link>
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+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
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+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="DecryptGIF.c" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
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diff --git a/Flare-On 6/10 - Mugatu/DecryptGIF/DecryptGIF.vcxproj.filters b/Flare-On 6/10 - Mugatu/DecryptGIF/DecryptGIF.vcxproj.filters
@@ -0,0 +1,22 @@
+<?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;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;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>
+    <ClCompile Include="DecryptGIF.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+</Project>
diff --git a/Flare-On 6/10 - Mugatu/DecryptGIF/pch.h b/Flare-On 6/10 - Mugatu/DecryptGIF/pch.h
@@ -0,0 +1,14 @@
+// Tips for Getting Started: 
+//   1. Use the Solution Explorer window to add/manage files
+//   2. Use the Team Explorer window to connect to source control
+//   3. Use the Output window to see build output and other messages
+//   4. Use the Error List window to view errors
+//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
+//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file
+
+#ifndef PCH_H
+#define PCH_H
+
+// TODO: add headers that you want to pre-compile here
+
+#endif //PCH_H