Add editorconfig, fix issues

The implementation was woefully incomplete to begin with, and if working with 3DS cart images has taught anything, making sure that it can deserialize properly needs to be done first. Once CIA support can be started again, it should be built from the ground up.

.editorconfig

@@ -0,0 +1,167 @@
+# top-most EditorConfig file
+root = true
+
+# C# files
+[*.cs]
+
+# Indentation and spacing
+charset = utf-8
+indent_size = 4
+indent_style = space
+tab_width = 4
+trim_trailing_whitespace = true
+
+# New line preferences
+end_of_line = lf
+insert_final_newline = true
+max_line_length = unset
+
+# using directive preferences
+csharp_using_directive_placement = outside_namespace
+dotnet_diagnostic.IDE0005.severity = error
+
+# Code-block preferences
+csharp_style_namespace_declarations = block_scoped
+csharp_style_prefer_method_group_conversion = true
+csharp_style_prefer_top_level_statements = false
+
+# Expression-level preferences
+csharp_prefer_simple_default_expression = true
+csharp_style_inlined_variable_declaration = true
+csharp_style_unused_value_assignment_preference = discard_variable
+csharp_style_unused_value_expression_statement_preference = discard_variable
+dotnet_diagnostic.IDE0001.severity = warning
+dotnet_diagnostic.IDE0002.severity = warning
+dotnet_diagnostic.IDE0004.severity = warning
+dotnet_diagnostic.IDE0010.severity = error
+dotnet_diagnostic.IDE0051.severity = warning
+dotnet_diagnostic.IDE0052.severity = warning
+dotnet_diagnostic.IDE0072.severity = warning
+dotnet_diagnostic.IDE0080.severity = warning
+dotnet_diagnostic.IDE0100.severity = error
+dotnet_diagnostic.IDE0110.severity = error
+dotnet_diagnostic.IDE0120.severity = warning
+dotnet_diagnostic.IDE0121.severity = warning
+dotnet_diagnostic.IDE0240.severity = error
+dotnet_diagnostic.IDE0241.severity = error
+dotnet_style_coalesce_expression = true
+dotnet_style_namespace_match_folder = false
+dotnet_style_null_propagation = true
+dotnet_style_prefer_auto_properties = true
+dotnet_style_prefer_collection_expression = when_types_loosely_match
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true
+dotnet_style_prefer_compound_assignment = true
+csharp_style_prefer_simple_property_accessors = true
+dotnet_style_prefer_simplified_interpolation = true
+dotnet_style_prefer_simplified_boolean_expressions = true
+csharp_style_prefer_unbound_generic_type_in_nameof = true
+
+# Field preferences
+dotnet_diagnostic.IDE0044.severity = warning
+dotnet_style_readonly_field = true
+
+# Language keyword vs. framework types preferences
+dotnet_diagnostic.IDE0049.severity = error
+dotnet_style_predefined_type_for_locals_parameters_members = true
+dotnet_style_predefined_type_for_member_access = true
+
+# Modifier preferences
+csharp_prefer_static_local_function = true
+csharp_style_prefer_readonly_struct = true
+dotnet_diagnostic.IDE0036.severity = warning
+dotnet_diagnostic.IDE0040.severity = error
+dotnet_diagnostic.IDE0380.severity = error
+dotnet_style_require_accessibility_modifiers = always
+
+# New-line preferences
+dotnet_diagnostic.IDE2000.severity = warning
+dotnet_diagnostic.IDE2002.severity = warning
+dotnet_diagnostic.IDE2003.severity = warning
+dotnet_diagnostic.IDE2004.severity = warning
+dotnet_diagnostic.IDE2005.severity = warning
+dotnet_diagnostic.IDE2006.severity = warning
+csharp_style_allow_blank_line_after_colon_in_constructor_initializer_experimental = false
+csharp_style_allow_blank_line_after_token_in_arrow_expression_clause_experimental = false
+csharp_style_allow_blank_line_after_token_in_conditional_expression_experimental = false
+csharp_style_allow_blank_lines_between_consecutive_braces_experimental = false
+dotnet_style_allow_multiple_blank_lines_experimental = false
+dotnet_style_allow_statement_immediately_after_block_experimental = false
+
+# Null-checking preferences
+csharp_style_conditional_delegate_call = true
+
+# Parameter preferences
+dotnet_code_quality_unused_parameters = all
+dotnet_diagnostic.IDE0280.severity = error
+
+# Parentheses preferences
+dotnet_diagnostic.IDE0047.severity = warning
+dotnet_diagnostic.IDE0048.severity = warning
+dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity
+dotnet_style_parentheses_in_other_binary_operators = always_for_clarity
+dotnet_style_parentheses_in_other_operators = always_for_clarity
+dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity
+
+# Pattern-matching preferences
+dotnet_diagnostic.IDE0019.severity = warning
+dotnet_diagnostic.IDE0020.severity = warning
+dotnet_diagnostic.IDE0038.severity = warning
+dotnet_diagnostic.IDE0066.severity = none
+dotnet_diagnostic.IDE0083.severity = warning
+dotnet_diagnostic.IDE0260.severity = warning
+csharp_style_pattern_matching_over_as_with_null_check = true
+csharp_style_pattern_matching_over_is_with_cast_check = true
+csharp_style_prefer_not_pattern = true
+csharp_style_prefer_pattern_matching = true
+
+# this. and Me. preferences
+dotnet_style_qualification_for_event = false
+dotnet_style_qualification_for_field = false
+dotnet_style_qualification_for_method = false
+dotnet_style_qualification_for_property = false
+
+# var preferences
+csharp_style_var_for_built_in_types = false
+csharp_style_var_when_type_is_apparent = true
+
+# .NET formatting options
+dotnet_separate_import_directive_groups = false
+dotnet_sort_system_directives_first = true
+
+# C# formatting options
+csharp_indent_block_contents = true
+csharp_indent_braces = false
+csharp_indent_case_contents = true
+csharp_indent_case_contents_when_block = false
+csharp_indent_labels = one_less_than_current
+csharp_indent_switch_labels = true
+csharp_new_line_before_catch = true
+csharp_new_line_before_else = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_open_brace = all
+csharp_new_line_between_query_expression_clauses = true
+csharp_preserve_single_line_blocks = true
+csharp_preserve_single_line_statements = true
+csharp_space_after_cast = false
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_after_comma = true
+csharp_space_after_dot = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_after_semicolon_in_for_statement = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_around_declaration_statements = false
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_before_comma = false
+csharp_space_before_dot = false
+csharp_space_before_open_square_brackets = false
+csharp_space_before_semicolon_in_for_statement = false
+csharp_space_between_empty_square_brackets = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_parentheses = false
+csharp_space_between_square_brackets = false

.github/workflows/build_and_test.yml

@@ -0,0 +1,48 @@
+name: Build and Test
+
+on:
+    push:
+        branches: ["master"]
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v5
+              with:
+                  fetch-depth: 0
+
+            - name: Setup .NET
+              uses: actions/setup-dotnet@v5
+              with:
+                  dotnet-version: |
+                      8.0.x
+                      9.0.x
+                      10.0.x
+
+            - name: Run tests
+              run: dotnet test
+
+            - name: Run publish script
+              run: ./publish-nix.sh -d
+
+            - name: Update rolling tag
+              run: |
+                  git config user.name "github-actions[bot]"
+                  git config user.email "github-actions[bot]@users.noreply.github.com"
+                  git tag -f rolling
+                  git push origin :refs/tags/rolling || true
+                  git push origin rolling --force
+
+            - name: Upload to rolling
+              uses: ncipollo/release-action@v1.20.0
+              with:
+                  allowUpdates: True
+                  artifacts: "*.nupkg,*.snupkg,*.zip"
+                  body: "Last built commit: ${{ github.sha }}"
+                  name: "Rolling Release"
+                  prerelease: True
+                  replacesArtifacts: True
+                  tag: "rolling"
+                  updateOnlyUnreleased: True

.github/workflows/check_pr.yml

@@ -0,0 +1,20 @@
+name: Build PR
+
+on: [pull_request]
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v5
+
+            - name: Setup .NET
+              uses: actions/setup-dotnet@v5
+              with:
+                  dotnet-version: |
+                      8.0.x
+                      9.0.x
+                      10.0.x
+
+            - name: Build
+              run: dotnet build

.gitignore

@@ -258,4 +258,7 @@ paket-files/
 
 # Python Tools for Visual Studio (PTVS)
 __pycache__/
-*.pyc
+*.pyc
+
+# VSCode
+/NDecrypt/Properties/launchSettings.json

.vscode/launch.json

@@ -0,0 +1,27 @@
+{
+   // Use IntelliSense to find out which attributes exist for C# debugging
+   // Use hover for the description of the existing attributes
+   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
+   "version": "0.2.0",
+   "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            // If you have changed target frameworks, make sure to update the program path.
+            "program": "${workspaceFolder}/NDecrypt/bin/Debug/net10.0/NDecrypt.dll",
+            "args": [],
+            "cwd": "${workspaceFolder}/NDecrypt",
+            // For more information about the 'console' field, see https://aka.ms/VSCode-CS-LaunchJson-Console
+            "console": "internalConsole",
+            "stopAtEntry": false
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command:pickProcess}"
+        }
+    ]
+}

.vscode/tasks.json

@@ -0,0 +1,24 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "command": "dotnet",
+            "type": "shell",
+            "args": [
+                "build",
+                // Ask dotnet build to generate full paths for file names.
+                "/property:GenerateFullPaths=true",
+                // Do not generate summary otherwise it leads to duplicate errors in Problems panel
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "group": "build",
+            "presentation": {
+                "reveal": "silent"
+            },
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

3DSDecrypt.sln

@@ -1,25 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27004.2006
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "3DSDecrypt", "3DSDecrypt\3DSDecrypt.csproj", "{2E30006A-3C60-4576-A262-937B21C83C06}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Any CPU = Debug|Any CPU
-		Release|Any CPU = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{2E30006A-3C60-4576-A262-937B21C83C06}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{2E30006A-3C60-4576-A262-937B21C83C06}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{2E30006A-3C60-4576-A262-937B21C83C06}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{2E30006A-3C60-4576-A262-937B21C83C06}.Release|Any CPU.Build.0 = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
-	GlobalSection(ExtensibilityGlobals) = postSolution
-		SolutionGuid = {5AB50D9B-BA18-4F96-804B-52E7E0845B37}
-	EndGlobalSection
-EndGlobal

3DSDecrypt/3DSDecrypt.csproj

@@ -1,75 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
-  <PropertyGroup>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProjectGuid>{2E30006A-3C60-4576-A262-937B21C83C06}</ProjectGuid>
-    <OutputType>Exe</OutputType>
-    <AppDesignerFolder>Properties</AppDesignerFolder>
-    <RootNamespace>_3DSDecrypt</RootNamespace>
-    <AssemblyName>3DSDecrypt</AssemblyName>
-    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
-    <FileAlignment>512</FileAlignment>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
-    <DebugSymbols>true</DebugSymbols>
-    <DebugType>full</DebugType>
-    <Optimize>false</Optimize>
-    <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>pdbonly</DebugType>
-    <Optimize>true</Optimize>
-    <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-  </PropertyGroup>
-  <PropertyGroup>
-    <StartupObject />
-  </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="BouncyCastle.Crypto, Version=1.8.4.0, Culture=neutral, PublicKeyToken=0e99375e54769942">
-      <HintPath>..\packages\BouncyCastle.1.8.4\lib\BouncyCastle.Crypto.dll</HintPath>
-    </Reference>
-    <Reference Include="System" />
-    <Reference Include="System.Core" />
-    <Reference Include="System.Numerics" />
-    <Reference Include="System.Xml.Linq" />
-    <Reference Include="System.Data.DataSetExtensions" />
-    <Reference Include="Microsoft.CSharp" />
-    <Reference Include="System.Data" />
-    <Reference Include="System.Net.Http" />
-    <Reference Include="System.Xml" />
-  </ItemGroup>
-  <ItemGroup>
-    <Compile Include="Data\Constants.cs" />
-    <Compile Include="Headers\NCCHHeaderFlags.cs" />
-    <Compile Include="ThreeDSTool.cs" />
-    <Compile Include="Data\Enums.cs" />
-    <Compile Include="Headers\AccessControlInfo.cs" />
-    <Compile Include="Headers\ARM11KernelCapabilities.cs" />
-    <Compile Include="Headers\ARM11LocalSystemCapabilities.cs" />
-    <Compile Include="Headers\ARM9AccessControl.cs" />
-    <Compile Include="Headers\CodeSetInfo.cs" />
-    <Compile Include="Headers\CXIExtendedHeader.cs" />
-    <Compile Include="Headers\ExeFSFileHeader.cs" />
-    <Compile Include="Headers\ExeFSHeader.cs" />
-    <Compile Include="Headers\NCCHHeader.cs" />
-    <Compile Include="Headers\NCSDHeader.cs" />
-    <Compile Include="Headers\PartitionTableEntry.cs" />
-    <Compile Include="Headers\StorageInfo.cs" />
-    <Compile Include="Headers\SystemControlInfo.cs" />
-    <Compile Include="Headers\SystemInfo.cs" />
-    <Compile Include="Program.cs" />
-    <Compile Include="Properties\AssemblyInfo.cs" />
-  </ItemGroup>
-  <ItemGroup>
-    <None Include="packages.config" />
-  </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-</Project>

3DSDecrypt/Data/Constants.cs

@@ -1,66 +0,0 @@
-using System.Numerics;
-
-namespace ThreeDS.Data
-{
-    public static class Constants
-    {
-        // Setup Keys and IVs
-        public static byte[] PlainCounter = new byte[] { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
-        public static byte[] ExefsCounter = new byte[] { 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
-        public static byte[] RomfsCounter = new byte[] { 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
-
-        // Big Endian - 0x1F, 0xF9, 0xE9, 0xAA, 0xC5, 0xFE, 0x04, 0x08, 0x02, 0x45, 0x91, 0xDC, 0x5D, 0x52, 0x76, 0x8A
-        // Little Endian - 0x8A, 0x76, 0x52, 0x5D, 0xDC, 0x91, 0x45, 0x02, 0x08, 0x04, 0xFE, 0xC5, 0xAA, 0xE9, 0xF9, 0x1F
-        public static BigInteger AESHardwareConstant = new BigInteger(new byte[] { 0x8A, 0x76, 0x52, 0x5D, 0xDC, 0x91, 0x45, 0x02, 0x08, 0x04, 0xFE, 0xC5, 0xAA, 0xE9, 0xF9, 0x1F });
-
-        #region Retail keys
-
-        // KeyX 0x18 (New 3DS 9.3)
-        // Big Endian - 0x82, 0xE9, 0xC9, 0xBE, 0xBF, 0xB8, 0xBD, 0xB8, 0x75, 0xEC, 0xC0, 0xA0, 0x7D, 0x47, 0x43, 0x74
-        // Little Endian - 0x74, 0x43, 0x47, 0x7D, 0xA0, 0xC0, 0xEC, 0x75, 0xB8, 0xBD, 0xB8, 0xBF, 0xBE, 0xC9, 0xE9, 0x82
-        public static BigInteger KeyX0x18 = new BigInteger(new byte[] { 0x74, 0x43, 0x47, 0x7D, 0xA0, 0xC0, 0xEC, 0x75, 0xB8, 0xBD, 0xB8, 0xBF, 0xBE, 0xC9, 0xE9, 0x82, 0x00 });
-
-        // KeyX 0x1B (New 3DS 9.6)
-        // Big Endian - 0x45, 0xAD, 0x04, 0x95, 0x39, 0x92, 0xC7, 0xC8, 0x93, 0x72, 0x4A, 0x9A, 0x7B, 0xCE, 0x61, 0x82
-        // Little Endian - 0x82, 0x61, 0xCE, 0x7B, 0x9A, 0x4A, 0x72, 0x93, 0xC8, 0xC7, 0x92, 0x39, 0x95, 0x04, 0xAD, 0x45
-        public static BigInteger KeyX0x1B = new BigInteger(new byte[] { 0x82, 0x61, 0xCE, 0x7B, 0x9A, 0x4A, 0x72, 0x93, 0xC8, 0xC7, 0x92, 0x39, 0x95, 0x04, 0xAD, 0x45, 0x00 });
-
-        // KeyX 0x25 (> 7.x)
-        // Big Endian - 0xCE, 0xE7, 0xD8, 0xAB, 0x30, 0xC0, 0x0D, 0xAE, 0x85, 0x0E, 0xF5, 0xE3, 0x82, 0xAC, 0x5A, 0xF3
-        // Little Endian - 0xF3, 0x5A, 0xAC, 0x82, 0xE3, 0xF5, 0x0E, 0x85, 0xAE, 0x0D, 0xC0, 0x30, 0xAB, 0xD8, 0xE7, 0xCE
-        public static BigInteger KeyX0x25 = new BigInteger(new byte[] { 0xF3, 0x5A, 0xAC, 0x82, 0xE3, 0xF5, 0x0E, 0x85, 0xAE, 0x0D, 0xC0, 0x30, 0xAB, 0xD8, 0xE7, 0xCE, 0x00 });
-
-        // Dev KeyX 0x2C (< 6.x)
-        // Big Endian - 0xB9, 0x8E, 0x95, 0xCE, 0xCA, 0x3E, 0x4D, 0x17, 0x1F, 0x76, 0xA9, 0x4D, 0xE9, 0x34, 0xC0, 0x53
-        // Little Endian - 0x53, 0xC0, 0x34, 0xE9, 0x4D, 0xA9, 0x76, 0x1F, 0x17, 0x4D, 0x3E, 0xCA, 0xCE, 0x95, 0x8E, 0xB9
-        public static BigInteger KeyX0x2C = new BigInteger(new byte[] { 0x53, 0xC0, 0x34, 0xE9, 0x4D, 0xA9, 0x76, 0x1F, 0x17, 0x4D, 0x3E, 0xCA, 0xCE, 0x95, 0x8E, 0xB9, 0x00 });
-
-        #endregion
-
-        #region Dev Keys (Must be converted to LE)
-
-        // Dev KeyX 0x18 (New 3DS 9.3)
-        // Big Endian - 0x30, 0x4B, 0xF1, 0x46, 0x83, 0x72, 0xEE, 0x64, 0x11, 0x5E, 0xBD, 0x40, 0x93, 0xD8, 0x42, 0x76
-        // Little Endian - 0x76, 0x42, 0xD8, 0x93, 0x40, 0xBD, 0x5E, 0x11, 0x64, 0xEE, 0x72, 0x83, 0x46, 0xF1, 0x4B, 0x30
-        public static BigInteger DevKeyX0x18 = new BigInteger(new byte[] { 0x76, 0x42, 0xD8, 0x93, 0x40, 0xBD, 0x5E, 0x11, 0x64, 0xEE, 0x72, 0x83, 0x46, 0xF1, 0x4B, 0x30, 0x00 });
-
-        // Dev KeyX 0x1B New 3DS 9.6)
-        // Big Endian - 0x6C, 0x8B, 0x29, 0x44, 0xA0, 0x72, 0x60, 0x35, 0xF9, 0x41, 0xDF, 0xC0, 0x18, 0x52, 0x4F, 0xB6
-        // Little Endian - 0xB6, 0x4F, 0x52, 0x18, 0xC0, 0xDF, 0x41, 0xF9, 0x35, 0x60, 0x72, 0xA0, 0x44, 0x29, 0x8B, 0x6C
-        public static BigInteger DevKeyX0x1B = new BigInteger(new byte[] { 0xB6, 0x4F, 0x52, 0x18, 0xC0, 0xDF, 0x41, 0xF9, 0x35, 0x60, 0x72, 0xA0, 0x44, 0x29, 0x8B, 0x6C, 0x00 });
-
-        // Dev KeyX 0x25 (> 7.x)
-        // Big Endian - 0x81, 0x90, 0x7A, 0x4B, 0x6F, 0x1B, 0x47, 0x32, 0x3A, 0x67, 0x79, 0x74, 0xCE, 0x4A, 0xD7, 0x1B
-        // Little Endian - 0x1B, 0xD7, 0x4A, 0xCE, 0x74, 0x79, 0x67, 0x3A, 0x32, 0x47, 0x1B, 0x6F, 0x4B, 0x7A, 0x90, 0x81
-        public static BigInteger DevKeyX0x25 = new BigInteger(new byte[] { 0x1B, 0xD7, 0x4A, 0xCE, 0x74, 0x79, 0x67, 0x3A, 0x32, 0x47, 0x1B, 0x6F, 0x4B, 0x7A, 0x90, 0x81, 0x00 });
-
-        // Dev KeyX 0x2C (< 6.x)
-        // Big Endian - 0x51, 0x02, 0x07, 0x51, 0x55, 0x07, 0xCB, 0xB1, 0x8E, 0x24, 0x3D, 0xCB, 0x85, 0xE2, 0x3A, 0x1D
-        // Little Endian - 0x1D, 0x3A, 0xE2, 0x85, 0xCB, 0x3D, 0x24, 0x8E, 0xB1, 0xCB, 0x07, 0x55, 0x51, 0x07, 0x02, 0x51
-        public static BigInteger DevKeyX0x2C = new BigInteger(new byte[] { 0x1D, 0x3A, 0xE2, 0x85, 0xCB, 0x3D, 0x24, 0x8E, 0xB1, 0xCB, 0x07, 0x55, 0x51, 0x07, 0x02, 0x51, 0x00 });
-
-        #endregion
-
-        public const int CXTExtendedDataHeaderLength = 0x800;
-    }
-}

3DSDecrypt/Data/Enums.cs

@@ -1,85 +0,0 @@
-using System;
-
-namespace ThreeDS.Data
-{
-    [Flags]
-    public enum BitMasks : byte
-    {
-        FixedCryptoKey = 0x01,
-        NoMountRomFs = 0x02,
-        NoCrypto = 0x04,
-        NewKeyYGenerator = 0x20,
-    }
-
-    public enum ContentPlatform : byte
-    {
-        CTR = 0x01,
-        Snake = 0x02, // New3DS
-    }
-
-    [Flags]
-    public enum ContentType : byte
-    {
-        Data = 0x01,
-        Executable = 0x02,
-        SystemUpdate = 0x04,
-        Manual = 0x08,
-        Child = 0x04 | 0x08,
-        Trial = 0x10,
-    }
-
-    public enum CryptoMethod : byte
-    {
-        Original = 0x00,
-        Seven = 0x01,
-        NineThree = 0x0A,
-        NineSix = 0x0B,
-    }
-
-    public enum FilesystemType : ulong
-    {
-        None = 0,
-        Normal = 1,
-        FIRM = 3,
-        AGB_FIRMSave = 4,
-    }
-
-    public enum MediaCardDeviceType : byte
-    {
-        NORFlash = 0x01,
-        None = 0x02,
-        BT = 0x03,
-    }
-
-    public enum MediaPlatformIndex : byte
-    {
-        CTR = 0x01,
-    }
-
-    public enum MediaTypeIndex : byte
-    {
-        InnerDevice = 0x00,
-        Card1 = 0x01,
-        Card2 = 0x02,
-        ExtendedDevice = 0x03,
-    }
-
-    public enum NCCHFlags
-    {
-        CryptoMethod = 0x03,
-        ContentPlatform = 0x04,
-        ContentTypeBitMask = 0x05,
-        ContentUnitSize = 0x06,
-        BitMasks = 0x07,
-    }
-
-    public enum NCSDFlags
-    {
-        BackupWriteWaitTime = 0x00,
-        MediaCardDevice3X = 0x03,
-        MediaPlatformIndex = 0x04,
-        MediaTypeIndex = 0x05,
-        MediaUnitSize = 0x06,
-        MediaCardDevice2X = 0x07,
-    }
-}

3DSDecrypt/Headers/ARM11KernelCapabilities.cs

@@ -1,28 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class ARM11KernelCapabilities
-    {
-        public byte[][] Descriptors = new byte[28][];
-        public byte[] Reserved = new byte[0x10];
-
-        public static ARM11KernelCapabilities Read(BinaryReader reader)
-        {
-            ARM11KernelCapabilities kc = new ARM11KernelCapabilities();
-
-            try
-            {
-                for (int i = 0; i < 28; i++)
-                    kc.Descriptors[i] = reader.ReadBytes(4);
-
-                kc.Reserved = reader.ReadBytes(0x10);
-                return kc;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/ARM11LocalSystemCapabilities.cs

@@ -1,54 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class ARM11LocalSystemCapabilities
-    {
-        public byte[] ProgramID = new byte[8];
-        public uint CoreVersion;
-        public byte Flag1;
-        public byte Flag2;
-        public byte Flag0;
-        public byte Priority;
-        public byte[][] ResourceLimitDescriptors = new byte[16][];
-        public StorageInfo StorageInfo;
-        public byte[][] ServiceAccessControl = new byte[32][];
-        public byte[][] ExtendedServiceAccessControl = new byte[2][];
-        public byte[] Reserved = new byte[0xF];
-        public byte ResourceLimitCategory;
-
-        public static ARM11LocalSystemCapabilities Read(BinaryReader reader)
-        {
-            ARM11LocalSystemCapabilities lsc = new ARM11LocalSystemCapabilities();
-
-            try
-            {
-                lsc.ProgramID = reader.ReadBytes(8);
-                lsc.CoreVersion = reader.ReadUInt32();
-                lsc.Flag1 = reader.ReadByte();
-                lsc.Flag2 = reader.ReadByte();
-                lsc.Flag0 = reader.ReadByte();
-                lsc.Priority = reader.ReadByte();
-
-                for (int i = 0; i < 16; i++)
-                    lsc.ResourceLimitDescriptors[i] = reader.ReadBytes(2);
-
-                lsc.StorageInfo = StorageInfo.Read(reader);
-
-                for (int i = 0; i < 32; i++)
-                    lsc.ServiceAccessControl[i] = reader.ReadBytes(8);
-
-                for (int i = 0; i < 2; i++)
-                    lsc.ExtendedServiceAccessControl[i] = reader.ReadBytes(8);
-
-                lsc.Reserved = reader.ReadBytes(0xF);
-                lsc.ResourceLimitCategory = reader.ReadByte();
-                return lsc;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/ARM9AccessControl.cs

@@ -1,26 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class ARM9AccessControl
-    {
-        public byte[] Descriptors = new byte[15];
-        public byte DescriptorVersion;
-
-        public static ARM9AccessControl Read(BinaryReader reader)
-        {
-            ARM9AccessControl ac = new ARM9AccessControl();
-
-            try
-            {
-                ac.Descriptors = reader.ReadBytes(15);
-                ac.DescriptorVersion = reader.ReadByte();
-                return ac;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/AccessControlInfo.cs

@@ -1,28 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class AccessControlInfo
-    {
-        public ARM11LocalSystemCapabilities ARM11LocalSystemCapabilities;
-        public ARM11KernelCapabilities ARM11KernelCapabilities;
-        public ARM9AccessControl ARM9AccessControl;
-
-        public static AccessControlInfo Read(BinaryReader reader)
-        {
-            AccessControlInfo aci = new AccessControlInfo();
-
-            try
-            {
-                aci.ARM11LocalSystemCapabilities = ARM11LocalSystemCapabilities.Read(reader);
-                aci.ARM11KernelCapabilities = ARM11KernelCapabilities.Read(reader);
-                aci.ARM9AccessControl = ARM9AccessControl.Read(reader);
-                return aci;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/CXIExtendedHeader.cs

@@ -1,32 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class CXIExtendedHeader
-    {
-        public SystemControlInfo SCI;
-        public AccessControlInfo ACI;
-        public byte[] AccessDescSignature = new byte[0x100];
-        public byte[] NCCHHDRPublicKey = new byte[0x100];
-        public AccessControlInfo ACIForLimitations;
-
-        public static CXIExtendedHeader Read(BinaryReader reader)
-        {
-            CXIExtendedHeader header = new CXIExtendedHeader();
-
-            try
-            {
-                header.SCI = SystemControlInfo.Read(reader);
-                header.ACI = AccessControlInfo.Read(reader);
-                header.AccessDescSignature = reader.ReadBytes(0x100);
-                header.NCCHHDRPublicKey = reader.ReadBytes(0x100);
-                header.ACIForLimitations = AccessControlInfo.Read(reader);
-                return header;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/CodeSetInfo.cs

@@ -1,28 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class CodeSetInfo
-    {
-        public byte[] Address = new byte[0x04];
-        public uint PhysicalRegionSizeInPages;
-        public uint SizeInBytes;
-
-        public static CodeSetInfo Read(BinaryReader reader)
-        {
-            CodeSetInfo csi = new CodeSetInfo();
-
-            try
-            {
-                csi.Address = reader.ReadBytes(4);
-                csi.PhysicalRegionSizeInPages = reader.ReadUInt32();
-                csi.SizeInBytes = reader.ReadUInt32();
-                return csi;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/ExeFSFileHeader.cs

@@ -1,32 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class ExeFSFileHeader
-    {
-        private const string codeSegment = ".code\0\0\0";
-
-        public string FileName;
-        public bool IsCodeBinary { get { return FileName == codeSegment; } }
-        public uint FileOffset;
-        public uint FileSize;
-        public byte[] FileHash = new byte[0x20];
-
-        public static ExeFSFileHeader Read(BinaryReader reader)
-        {
-            ExeFSFileHeader header = new ExeFSFileHeader();
-
-            try
-            {
-                header.FileName = new string(reader.ReadChars(8));
-                header.FileOffset = reader.ReadUInt32();
-                header.FileSize = reader.ReadUInt32();
-                return header;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/ExeFSHeader.cs

@@ -1,35 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class ExeFSHeader
-    {
-        public ExeFSFileHeader[] FileHeaders = new ExeFSFileHeader[10];
-        public byte[] Reserved = new byte[0x20];
-
-        public static ExeFSHeader Read(BinaryReader reader)
-        {
-            ExeFSHeader header = new ExeFSHeader();
-
-            try
-            {
-                for (int i = 0; i < 10; i++)
-                    header.FileHeaders[i] = ExeFSFileHeader.Read(reader);
-
-                header.Reserved = reader.ReadBytes(0x20);
-
-                for (int i = 0; i < 10; i++)
-                {
-                    byte[] fileHash = reader.ReadBytes(0x20);
-                    header.FileHeaders[9 - i].FileHash = fileHash;
-                }
-
-                return header;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/NCCHHeader.cs

@@ -1,101 +0,0 @@
-using System;
-using System.IO;
-using System.Linq;
-using ThreeDS.Data;
-
-namespace ThreeDS.Headers
-{
-    public class NCCHHeader
-    {
-        private const string NCCHMagicNumber = "NCCH";
-
-        public byte[] RSA2048Signature = new byte[0x100];
-        public uint ContentSizeInMediaUnits;
-        public uint ContentSizeInBytes { get { return ContentSizeInMediaUnits * 0x200; } }
-        public byte[] PartitionId = new byte[8];
-        public byte[] MakerCode = new byte[2];
-        public byte[] Version = new byte[2];
-        public byte[] VerificationHash = new byte[4];
-        public byte[] ProgramId = new byte[4];
-        public byte[] Reserved1 = new byte[0x10];
-        public byte[] LogoRegionHash = new byte[0x20];
-        public byte[] ProductCode = new byte[0x10];
-        public byte[] ExtendedHeaderHash = new byte[0x20];
-        public uint ExtendedHeaderSizeInBytes;
-        public byte[] Reserved2 = new byte[4];
-        public NCCHHeaderFlags Flags;
-        public uint PlainRegionOffsetInMediaUnits;
-        public uint PlainRegionOffsetInBytes { get { return PlainRegionOffsetInMediaUnits * 0x200; } }
-        public uint PlainRegionSizeInMediaUnits;
-        public uint PlainRegionSizeInBytes { get { return PlainRegionSizeInMediaUnits * 0x200; } }
-        public uint LogoRegionOffsetInMediaUnits;
-        public uint LogoRegionOffsetInBytes { get { return LogoRegionOffsetInMediaUnits * 0x200; } }
-        public uint LogoRegionSizeInMediaUnits;
-        public uint LogoRegionSizeInBytes { get { return LogoRegionSizeInMediaUnits * 0x200; } }
-        public uint ExeFSOffsetInMediaUnits;
-        public uint ExeFSOffsetInBytes { get { return ExeFSOffsetInMediaUnits * 0x200; } }
-        public uint ExeFSSizeInMediaUnits;
-        public uint ExeFSSizeInBytes { get { return ExeFSSizeInMediaUnits * 0x200; } }
-        public uint ExeFSHashRegionOffsetInMediaUnits;
-        public uint ExeFSHashRegionOffsetInBytes { get { return ExeFSHashRegionOffsetInMediaUnits * 0x200; } }
-        public uint ExeFSHashRegionSizeInMediaUnits;
-        public uint ExeFSHashRegionSizeInBytes { get { return ExeFSHashRegionSizeInMediaUnits * 0x200; } }
-        public uint RomFSOffsetInMediaUnits;
-        public uint RomFSOffsetInBytes { get { return RomFSOffsetInMediaUnits * 0x200; } }
-        public uint RomFSSizeInMediaUnits;
-        public uint RomFSSizeInBytes { get { return RomFSSizeInMediaUnits * 0x200; } }
-        public uint RomFSHashRegionOffsetInMediaUnits;
-        public uint RomFSHashRegionOffsetInBytes { get { return RomFSHashRegionOffsetInMediaUnits * 0x200; } }
-        public uint RomFSHashRegionSizeInMediaUnits;
-        public uint RomFSHashRegionSizeInBytes { get { return RomFSHashRegionSizeInMediaUnits * 0x200; } }
-        public byte[] ExeFSSuperblockHash = new byte[0x20];
-        public byte[] RomFSSuperblockHash = new byte[0x20];
-
-        public static NCCHHeader Read(BinaryReader reader)
-        {
-            NCCHHeader header = new NCCHHeader();
-
-            try
-            {
-                header.RSA2048Signature = reader.ReadBytes(0x100);
-
-                if (new string(reader.ReadChars(4)) != NCCHMagicNumber)
-                    return null;
-
-                header.ContentSizeInMediaUnits = reader.ReadUInt32();
-                header.PartitionId = reader.ReadBytes(8).Reverse().ToArray();
-                header.MakerCode = reader.ReadBytes(2);
-                header.Version = reader.ReadBytes(2);
-                header.VerificationHash = reader.ReadBytes(4);
-                header.ProgramId = reader.ReadBytes(8);
-                header.Reserved1 = reader.ReadBytes(0x10);
-                header.LogoRegionHash = reader.ReadBytes(0x20);
-                header.ProductCode = reader.ReadBytes(0x10);
-                header.ExtendedHeaderHash = reader.ReadBytes(0x20);
-                header.ExtendedHeaderSizeInBytes = reader.ReadUInt32();
-                header.Reserved2 = reader.ReadBytes(4);
-                header.Flags = NCCHHeaderFlags.Read(reader);
-                header.PlainRegionOffsetInMediaUnits = reader.ReadUInt32();
-                header.PlainRegionSizeInMediaUnits = reader.ReadUInt32();
-                header.LogoRegionOffsetInMediaUnits = reader.ReadUInt32();
-                header.LogoRegionSizeInMediaUnits = reader.ReadUInt32();
-                header.ExeFSOffsetInMediaUnits = reader.ReadUInt32();
-                header.ExeFSSizeInMediaUnits = reader.ReadUInt32();
-                header.ExeFSHashRegionOffsetInMediaUnits = reader.ReadUInt32();
-                header.ExeFSHashRegionSizeInMediaUnits = reader.ReadUInt32();
-                header.RomFSOffsetInMediaUnits = reader.ReadUInt32();
-                header.RomFSSizeInMediaUnits = reader.ReadUInt32();
-                header.RomFSHashRegionOffsetInMediaUnits = reader.ReadUInt32();
-                header.RomFSHashRegionSizeInMediaUnits = reader.ReadUInt32();
-                header.ExeFSSuperblockHash = reader.ReadBytes(0x20);
-                header.RomFSSuperblockHash = reader.ReadBytes(0x20);
-
-                return header;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/NCCHHeaderFlags.cs

@@ -1,58 +0,0 @@
-using System;
-using System.IO;
-using ThreeDS.Data;
-
-namespace ThreeDS.Headers
-{
-    public class NCCHHeaderFlags
-    {
-        public byte Reserved0;
-        public byte Reserved1;
-        public byte Reserved2;
-        public CryptoMethod CryptoMethod;
-        public ContentPlatform ContentPlatform;
-        public ContentType MediaPlatformIndex;
-        public byte ContentUnitSize;
-        public uint ContentUnitSizeInBytes { get { return (uint)(0x200 * Math.Pow(2, this.ContentUnitSize)); } }
-        public BitMasks BitMasks;
-
-        public static NCCHHeaderFlags Read(BinaryReader reader)
-        {
-            NCCHHeaderFlags flags = new NCCHHeaderFlags();
-
-            try
-            {
-                flags.Reserved0 = reader.ReadByte();
-                flags.Reserved1 = reader.ReadByte();
-                flags.Reserved2 = reader.ReadByte();
-                flags.CryptoMethod = (CryptoMethod)reader.ReadByte();
-                flags.ContentPlatform = (ContentPlatform)reader.ReadByte();
-                flags.MediaPlatformIndex = (ContentType)reader.ReadByte();
-                flags.ContentUnitSize = reader.ReadByte();
-                flags.BitMasks = (BitMasks)reader.ReadByte();
-                return flags;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-
-        public void Write(BinaryWriter writer)
-        {
-            try
-            {
-                writer.Write(this.Reserved0);
-                writer.Write(this.Reserved1);
-                writer.Write(this.Reserved2);
-                writer.Write((byte)this.CryptoMethod);
-                writer.Write((byte)this.ContentPlatform);
-                writer.Write((byte)this.MediaPlatformIndex);
-                writer.Write((byte)this.ContentUnitSize);
-                writer.Write((byte)this.BitMasks);
-
-            }
-            catch { }
-        }
-    }
-}

3DSDecrypt/Headers/NCSDHeader.cs

@@ -1,90 +0,0 @@
-using System;
-using System.IO;
-using ThreeDS.Data;
-
-namespace ThreeDS.Headers
-{
-    public class NCSDHeader
-    {
-        private const string NCSDMagicNumber = "NCSD";
-
-        // Common to all NCSD files
-        public byte[] RSA2048Signature = new byte[0x100];
-        public uint ImageSizeInMediaUnits;
-        public uint ImageSizeInBytes { get { return ImageSizeInMediaUnits * 0x200; } }
-        public byte[] MediaId = new byte[8];
-        public FilesystemType PartitionsFSType;
-        public byte[] PartitionsCryptType = new byte[8];
-        public PartitionTableEntry[] PartitionsTable = new PartitionTableEntry[8];
-
-        // For carts
-        public byte[] ExheaderHash = new byte[0x20];
-        public uint AdditionalHeaderSize;
-        public uint SectorZeroOffset;
-        private byte[] partitionFlags = new byte[8];
-        public byte BackupWriteWaitTime { get { return partitionFlags[(int)NCSDFlags.BackupWriteWaitTime]; } }
-        public MediaCardDeviceType MediaCardDevice3X { get { return (MediaCardDeviceType)partitionFlags[(int)NCSDFlags.MediaCardDevice3X]; } }
-        public MediaPlatformIndex MediaPlatformIndex { get { return (MediaPlatformIndex)partitionFlags[(int)NCSDFlags.MediaPlatformIndex]; } }
-        public MediaTypeIndex MediaTypeIndex { get { return (MediaTypeIndex)partitionFlags[(int)NCSDFlags.MediaTypeIndex]; } }
-        public uint SectorSize { get { return (uint)(0x200 * Math.Pow(2, partitionFlags[(int)NCSDFlags.MediaUnitSize])); } }
-        public MediaCardDeviceType MediaCardDevice2X { get { return (MediaCardDeviceType)partitionFlags[(int)NCSDFlags.MediaCardDevice2X]; } }
-        public byte[][] PartitionIdTable = new byte[8][];
-        public byte[] ReservedBlock1 = new byte[0x20];
-        public byte[] ReservedBlock2 = new byte[0xE];
-        public byte FirmUpdateByte1;
-        public byte FIrmUpdateByte2;
-
-        // For NAND
-        public byte[] Unknown = new byte[0x5E];
-        public byte[] EncryptedMBR = new byte[0x42];
-
-        public static NCSDHeader Read(BinaryReader reader)
-        {
-            NCSDHeader header = new NCSDHeader();
-
-            try
-            {
-                header.RSA2048Signature = reader.ReadBytes(0x100);
-
-                if (new string(reader.ReadChars(4)) != NCSDMagicNumber)
-                    return null;
-
-                header.ImageSizeInMediaUnits = reader.ReadUInt32();
-                header.MediaId = reader.ReadBytes(8);
-                header.PartitionsFSType = (FilesystemType)reader.ReadUInt64();
-                header.PartitionsCryptType = reader.ReadBytes(8);
-
-                for (int i = 0; i < 8; i++)
-                    header.PartitionsTable[i] = PartitionTableEntry.Read(reader);
-
-                if (header.PartitionsFSType == FilesystemType.Normal
-                    || header.PartitionsFSType == FilesystemType.None)
-                {
-                    header.ExheaderHash = reader.ReadBytes(0x20);
-                    header.AdditionalHeaderSize = reader.ReadUInt32();
-                    header.SectorZeroOffset = reader.ReadUInt32();
-                    header.partitionFlags = reader.ReadBytes(8);
-
-                    for (int i = 0; i < 8; i++)
-                        header.PartitionIdTable[i] = reader.ReadBytes(8);
-                    
-                    header.ReservedBlock1 = reader.ReadBytes(0x20);
-                    header.ReservedBlock2 = reader.ReadBytes(0xE);
-                    header.FirmUpdateByte1 = reader.ReadByte();
-                    header.FIrmUpdateByte2 = reader.ReadByte();
-                }
-                else if (header.PartitionsFSType == FilesystemType.FIRM)
-                {
-                    header.Unknown = reader.ReadBytes(0x5E);
-                    header.EncryptedMBR = reader.ReadBytes(0x42);
-                }
-
-                return header;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/PartitionTableEntry.cs

@@ -1,31 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class PartitionTableEntry
-    {
-        public uint Offset { get; set; }
-        public uint Length { get; set; }
-
-        public static PartitionTableEntry Read(BinaryReader reader)
-        {
-            PartitionTableEntry entry = new PartitionTableEntry();
-
-            try
-            {
-                entry.Offset = reader.ReadUInt32();
-                entry.Length = reader.ReadUInt32();
-                return entry;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-
-        public bool IsValid()
-        {
-            return Offset != 0 && Length != 0;
-        }
-    }
-}

3DSDecrypt/Headers/StorageInfo.cs

@@ -1,32 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class StorageInfo
-    {
-        public byte[] ExtdataID = new byte[8];
-        public byte[] SystemSavedataIDs = new byte[8];
-        public byte[] StorageAccessibleUniqueIDs = new byte[8];
-        public byte[] FilesystemAccessInfo = new byte[7];
-        public byte OtherAttributes;
-
-        public static StorageInfo Read(BinaryReader reader)
-        {
-            StorageInfo si = new StorageInfo();
-
-            try
-            {
-                si.ExtdataID = reader.ReadBytes(8);
-                si.SystemSavedataIDs = reader.ReadBytes(8);
-                si.StorageAccessibleUniqueIDs = reader.ReadBytes(8);
-                si.FilesystemAccessInfo = reader.ReadBytes(7);
-                si.OtherAttributes = reader.ReadByte();
-                return si;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/SystemControlInfo.cs

@@ -1,49 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class SystemControlInfo
-    {
-        public char[] ApplicationTitle = new char[8];
-        public byte[] Reserved1 = new byte[5];
-        public byte Flag;
-        public byte[] RemasterVersion = new byte[2];
-        public CodeSetInfo TextCodesetInfo;
-        public uint StackSize;
-        public CodeSetInfo ReadOnlyCodeSetInfo;
-        public byte[] Reserved2 = new byte[4];
-        public CodeSetInfo DataCodeSetInfo;
-        public uint BSSSize;
-        public byte[][] DependencyModuleList = new byte[48][];
-        public SystemInfo SystemInfo;
-
-        public static SystemControlInfo Read(BinaryReader reader)
-        {
-            SystemControlInfo sci = new SystemControlInfo();
-
-            try
-            {
-                sci.ApplicationTitle = reader.ReadChars(8);
-                sci.Reserved1 = reader.ReadBytes(5);
-                sci.Flag = reader.ReadByte();
-                sci.RemasterVersion = reader.ReadBytes(2);
-                sci.TextCodesetInfo = CodeSetInfo.Read(reader);
-                sci.StackSize = reader.ReadUInt32();
-                sci.ReadOnlyCodeSetInfo = CodeSetInfo.Read(reader);
-                sci.Reserved2 = reader.ReadBytes(4);
-                sci.DataCodeSetInfo = CodeSetInfo.Read(reader);
-                sci.BSSSize = reader.ReadUInt32();
-
-                for (int i = 0; i < 48; i++)
-                    sci.DependencyModuleList[i] = reader.ReadBytes(8);
-
-                sci.SystemInfo = SystemInfo.Read(reader);
-                return sci;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Headers/SystemInfo.cs

@@ -1,28 +0,0 @@
-using System.IO;
-
-namespace ThreeDS.Headers
-{
-    public class SystemInfo
-    {
-        public ulong SaveDataSize;
-        public byte[] JumpID = new byte[8];
-        public byte[] Reserved = new byte[0x30];
-
-        public static SystemInfo Read(BinaryReader reader)
-        {
-            SystemInfo si = new SystemInfo();
-
-            try
-            {
-                si.SaveDataSize = reader.ReadUInt64();
-                si.JumpID = reader.ReadBytes(8);
-                si.Reserved = reader.ReadBytes(0x30);
-                return si;
-            }
-            catch
-            {
-                return null;
-            }
-        }
-    }
-}

3DSDecrypt/Program.cs

@@ -1,49 +0,0 @@
-using System;
-using System.IO;
-
-namespace ThreeDS
-{
-    class Program
-    {
-        public static void Main(string[] args)
-        {
-            if (args.Length < 2 || (args[0] != "encrypt" && args[0] != "decrypt"))
-            {
-                Console.WriteLine("Usage: 3dsdecrypt.exe (decrypt|encrypt) [-dev] <file|dir> ...");
-                return;
-            }
-
-            bool development = false;
-            int start = 1;
-            if (args[1] == "-dev")
-            {
-                development = true;
-                start = 2;
-            }
-
-            for (int i = start; i < args.Length; i++)
-            {
-                if (File.Exists(args[i]))
-                {
-                    ThreeDSTool tool = new ThreeDSTool(args[i], development);
-                    if (args[0] == "decrypt")
-                        tool.Decrypt();
-                    else if (args[0] == "encrypt")
-                        tool.Encrypt();
-                }
-                else if (Directory.Exists(args[i]))
-                {
-                    foreach (string file in Directory.EnumerateFiles(args[i], "*", SearchOption.AllDirectories))
-                    {
-                        ThreeDSTool tool = new ThreeDSTool(file, development);
-                        if (args[0] == "decrypt")
-                            tool.Decrypt();
-                        else if (args[0] == "encrypt")
-                            tool.Encrypt();
-
-                    }
-                }
-            }
-        }
-    }
-}

3DSDecrypt/Properties/AssemblyInfo.cs

@@ -1,36 +0,0 @@
-using System.Reflection;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-
-// General Information about an assembly is controlled through the following
-// set of attributes. Change these attribute values to modify the information
-// associated with an assembly.
-[assembly: AssemblyTitle("3DSDecrypt")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("")]
-[assembly: AssemblyProduct("3DSDecrypt")]
-[assembly: AssemblyCopyright("Copyright ©  2018")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
-// Setting ComVisible to false makes the types in this assembly not visible
-// to COM components.  If you need to access a type in this assembly from
-// COM, set the ComVisible attribute to true on that type.
-[assembly: ComVisible(false)]
-
-// The following GUID is for the ID of the typelib if this project is exposed to COM
-[assembly: Guid("2e30006a-3c60-4576-a262-937b21c83c06")]
-
-// Version information for an assembly consists of the following four values:
-//
-//      Major Version
-//      Minor Version
-//      Build Number
-//      Revision
-//
-// You can specify all the values or you can default the Build and Revision Numbers
-// by using the '*' as shown below:
-// [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]

3DSDecrypt/ThreeDSTool.cs

@@ -1,623 +0,0 @@
-using System;
-using System.IO;
-using System.Linq;
-using System.Numerics;
-using Org.BouncyCastle.Crypto.Parameters;
-using Org.BouncyCastle.Security;
-using ThreeDS.Data;
-using ThreeDS.Headers;
-
-namespace ThreeDS
-{
-    public class ThreeDSTool
-    {
-        private readonly string filename;
-        private readonly bool development;
-
-        public ThreeDSTool(string filename, bool development)
-        {
-            this.filename = filename;
-            this.development = development;
-        }
-
-        public void Decrypt()
-        {
-            if (!File.Exists(filename))
-                return;
-
-            Console.WriteLine(filename);
-
-            using (BinaryReader f = new BinaryReader(File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
-            using (BinaryWriter g = new BinaryWriter(File.Open(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)))
-            {
-                NCSDHeader header = NCSDHeader.Read(f);
-                if (header == null)
-                {
-                    Console.WriteLine("Error: Not a 3DS Rom!");
-                    return;
-                }
-
-                // Iterate over all 8 NCCH partitions
-                for (int p = 0; p < 8; p++)
-                {
-                    if (!header.PartitionsTable[p].IsValid())
-                    {
-                        Console.WriteLine("Partition {0} Not found... Skipping...", p);
-                        continue;
-                    }
-
-                    // Seek to the beginning of the NCCH partition
-                    f.BaseStream.Seek((header.PartitionsTable[p].Offset * header.SectorSize), SeekOrigin.Begin);
-
-                    NCCHHeader partitionHeader = NCCHHeader.Read(f);
-                    if (partitionHeader == null)
-                    {
-                        Console.WriteLine("Partition {0} Unable to read NCCH header", p);
-                        continue;
-                    }
-
-                    // Check if the 'NoCrypto' bit is set
-                    if ((partitionHeader.Flags.BitMasks & BitMasks.NoCrypto) != 0)
-                    {
-                        Console.WriteLine("Partition {0:d}: Already Decrypted?...", p);
-                        continue;
-                    }
-
-                    // PartitionID is used as IV joined with the content type.
-                    byte[] plainIV = partitionHeader.PartitionId.Concat(Constants.PlainCounter).ToArray(); // Get the IV for plain sector (TitleID + Plain Counter)
-                    byte[] exefsIV = partitionHeader.PartitionId.Concat(Constants.ExefsCounter).ToArray(); // Get the IV for ExeFS (TitleID + ExeFS Counter)
-                    byte[] romfsIV = partitionHeader.PartitionId.Concat(Constants.RomfsCounter).ToArray(); // Get the IV for RomFS (TitleID + RomFS Counter)
-
-                    BigInteger KeyX = 0;
-                    BigInteger KeyX2C = (development ? Constants.DevKeyX0x2C : Constants.KeyX0x2C);
-                    BigInteger KeyY = new BigInteger(partitionHeader.RSA2048Signature.Take(16).Reverse().ToArray()); // KeyY is the first 16 bytes of the partition RSA-2048 SHA-256 signature
-                   
-                    BigInteger NormalKey = 0;
-                    BigInteger NormalKey2C = RotateLeft((RotateLeft(KeyX2C, 2, 128) ^ KeyY) + Constants.AESHardwareConstant, 87, 128);
-
-                    // Determine the Keys to be used
-                    if ((partitionHeader.Flags.BitMasks & BitMasks.FixedCryptoKey) != 0)
-                    {
-                        NormalKey = 0x00;
-                        NormalKey2C = 0x00;
-                        if (p == 0)
-                            Console.WriteLine("Encryption Method: Zero Key");
-                    }
-                    else
-                    {
-                        if (partitionHeader.Flags.CryptoMethod == CryptoMethod.Original)
-                        {
-                            KeyX = (development ? Constants.DevKeyX0x2C : Constants.KeyX0x2C);
-                            if (p == 0)
-                                Console.WriteLine("Encryption Method: Key 0x2C");
-                        }
-                        else if (partitionHeader.Flags.CryptoMethod == CryptoMethod.Seven)
-                        {
-                            KeyX = (development ? Constants.KeyX0x25 : Constants.KeyX0x25);
-                            if (p == 0)
-                                Console.WriteLine("Encryption Method: Key 0x25");
-                        }
-                        else if (partitionHeader.Flags.CryptoMethod == CryptoMethod.NineThree)
-                        {
-                            KeyX = (development ? Constants.DevKeyX0x18 : Constants.KeyX0x18);
-                            if (p == 0)
-                                Console.WriteLine("Encryption Method: Key 0x18");
-                        }
-                        else if (partitionHeader.Flags.CryptoMethod == CryptoMethod.NineSix)
-                        {
-                            KeyX = (development ? Constants.DevKeyX0x1B : Constants.KeyX0x1B);
-                            if (p == 0)
-                                Console.WriteLine("Encryption Method: Key 0x1B");
-                        }
-
-                        NormalKey = RotateLeft((RotateLeft(KeyX, 2, 128) ^ KeyY) + Constants.AESHardwareConstant, 87, 128);
-                    }
-
-                    // Decrypted extended header, if it exists
-                    if (partitionHeader.ExtendedHeaderSizeInBytes > 0)
-                    {
-                        // Seek to the partition start and skip first part of the header
-                        f.BaseStream.Seek((header.PartitionsTable[p].Offset * header.SectorSize) + 0x200, SeekOrigin.Begin);
-                        g.BaseStream.Seek((header.PartitionsTable[p].Offset * header.SectorSize) + 0x200, SeekOrigin.Begin);
-
-                        var str = BitConverter.ToString(plainIV).Replace("-", "");
-
-                        var exefsctrmode2C = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                        exefsctrmode2C.Init(false, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey2C)), plainIV));
-
-                        Console.WriteLine("Partition {0} ExeFS: Decrypting: ExHeader", p);
-
-                        g.Write(exefsctrmode2C.ProcessBytes(f.ReadBytes(Constants.CXTExtendedDataHeaderLength)));
-                        g.Flush();
-                    }
-
-                    // Decrypt the ExeFS, if it exists
-                    if (partitionHeader.ExeFSSizeInBytes > 0)
-                    {
-                        f.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits) * header.SectorSize, SeekOrigin.Begin);
-                        g.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits) * header.SectorSize, SeekOrigin.Begin);
-
-                        var exefsctrmode2C = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                        exefsctrmode2C.Init(false, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey2C)), exefsIV));
-
-                        g.Write(exefsctrmode2C.ProcessBytes(f.ReadBytes((int)header.SectorSize)));
-                        g.Flush();
-
-                        Console.WriteLine("Partition {0} ExeFS: Decrypting: ExeFS Filename Table", p);
-
-                        if (partitionHeader.Flags.CryptoMethod != CryptoMethod.Original)
-                        {
-                            f.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits) * header.SectorSize, SeekOrigin.Begin);
-                            ExeFSHeader exefsHeader = ExeFSHeader.Read(f);
-                            if (exefsHeader != null)
-                            {
-                                foreach (ExeFSFileHeader fileHeader in exefsHeader.FileHeaders)
-                                {
-                                    if (!fileHeader.IsCodeBinary)
-                                        continue;
-
-                                    uint datalenM = ((fileHeader.FileSize) / (1024 * 1024));
-                                    uint datalenB = ((fileHeader.FileSize) % (1024 * 1024));
-                                    uint ctroffset = ((fileHeader.FileOffset + header.SectorSize) / 0x10);
-
-                                    byte[] exefsIVWithOffsetForHeader = AddToByteArray(exefsIV, (int)ctroffset);
-
-                                    var exefsctrmode = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                                    exefsctrmode.Init(false, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey)), exefsIVWithOffsetForHeader));
-
-                                    exefsctrmode2C = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                                    exefsctrmode2C.Init(true, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey2C)), exefsIVWithOffsetForHeader));
-
-                                    f.BaseStream.Seek((((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits) + 1) * header.SectorSize) + fileHeader.FileOffset, SeekOrigin.Begin);
-                                    g.BaseStream.Seek((((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits) + 1) * header.SectorSize) + fileHeader.FileOffset, SeekOrigin.Begin);
-
-                                    if (datalenM > 0)
-                                    {
-                                        for (int i = 0; i < datalenM; i++)
-                                        {
-                                            g.Write(exefsctrmode2C.ProcessBytes(exefsctrmode.ProcessBytes(f.ReadBytes(1024 * 1024))));
-                                            g.Flush();
-                                            Console.Write("\rPartition {0} ExeFS: Decrypting: {1}... {2} / {3} mb...", p, fileHeader.FileName, i, datalenM + 1);
-                                        }
-                                    }
-
-                                    if (datalenB > 0)
-                                    {
-                                        g.Write(exefsctrmode2C.ProcessBytes(exefsctrmode.ProcessBytes(f.ReadBytes((int)datalenB))));
-                                        g.Flush();
-                                    }
-
-                                    Console.Write("\rPartition {0} ExeFS: Decrypting: {1}... {2} / {3} mb... Done!\r\n", p, fileHeader.FileName, datalenM + 1, datalenM + 1);
-                                }
-                            }
-                        }
-
-                        // decrypt exefs
-                        int exefsSizeM = (int)((partitionHeader.ExeFSSizeInMediaUnits - 1) * header.SectorSize) / (1024 * 1024);
-                        int exefsSizeB = (int)((partitionHeader.ExeFSSizeInMediaUnits - 1) * header.SectorSize) % (1024 * 1024);
-                        int ctroffsetE = (int)(header.SectorSize / 0x10);
-
-                        byte[] exefsIVWithOffset = AddToByteArray(exefsIV, ctroffsetE);
-
-                        exefsctrmode2C = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                        exefsctrmode2C.Init(false, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey2C)), exefsIVWithOffset));
-
-                        f.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits + 1) * header.SectorSize, SeekOrigin.Begin);
-                        g.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits + 1) * header.SectorSize, SeekOrigin.Begin);
-                        if (exefsSizeM > 0)
-                        {
-                            for (int i = 0; i < exefsSizeM; i++)
-                            {
-                                g.Write(exefsctrmode2C.ProcessBytes(f.ReadBytes(1024 * 1024)));
-                                g.Flush();
-                                Console.Write("\rPartition {0} ExeFS: Decrypting: {1} / {2} mb", p, i, exefsSizeM + 1);
-                            }
-                        }
-                        if (exefsSizeB > 0)
-                        {
-                            g.Write(exefsctrmode2C.ProcessBytes(f.ReadBytes(exefsSizeB)));
-                            g.Flush();
-                        }
-
-                        Console.Write("\rPartition {0} ExeFS: Decrypting: {1} / {2} mb... Done!\r\n", p, exefsSizeM + 1, exefsSizeM + 1);
-                    }
-                    else
-                    {
-                        Console.WriteLine("Partition {0} ExeFS: No Data... Skipping...", p);
-                    }
-
-                    if (partitionHeader.RomFSOffsetInMediaUnits != 0)
-                    {
-                        int romfsSizeM = (int)(partitionHeader.RomFSSizeInMediaUnits * header.SectorSize) / (1024 * 1024);
-                        int romfsSizeB = (int)(partitionHeader.RomFSSizeInMediaUnits * header.SectorSize) % (1024 * 1024);
-
-                        var romfsctrmode = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                        romfsctrmode.Init(false, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey)), romfsIV));
-
-                        f.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.RomFSOffsetInMediaUnits) * header.SectorSize, SeekOrigin.Begin);
-                        g.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.RomFSOffsetInMediaUnits) * header.SectorSize, SeekOrigin.Begin);
-                        if (romfsSizeM > 0)
-                        {
-                            for (int i = 0; i < romfsSizeM; i++)
-                            {
-                                g.Write(romfsctrmode.ProcessBytes(f.ReadBytes(1024 * 1024)));
-                                g.Flush();
-                                Console.Write("\rPartition {0} RomFS: Decrypting: {1} / {2} mb", p, i, romfsSizeM + 1);
-                            }
-                        }
-                        if (romfsSizeB > 0)
-                        {
-                            g.Write(romfsctrmode.ProcessBytes(f.ReadBytes(romfsSizeB)));
-                            g.Flush();
-                        }
-
-                        Console.Write("\rPartition {0} RomFS: Decrypting: {1} / {2} mb... Done!\r\n", p, romfsSizeM + 1, romfsSizeM + 1);
-                    }
-                    else
-                    {
-                        Console.WriteLine("Partition {0} RomFS: No Data... Skipping...", p);
-                    }
-
-                    // Write the new CryptoMethod
-                    g.BaseStream.Seek((header.PartitionsTable[p].Offset * header.SectorSize) + 0x18B, SeekOrigin.Begin);
-                    g.Write((byte)CryptoMethod.Original);
-                    g.Flush();
-
-                    // Write the new BitMasks flag
-                    g.BaseStream.Seek((header.PartitionsTable[p].Offset * header.SectorSize) + 0x18F, SeekOrigin.Begin);
-                    BitMasks flag = partitionHeader.Flags.BitMasks;
-                    flag = flag & (BitMasks)((byte)(BitMasks.FixedCryptoKey | BitMasks.NewKeyYGenerator) ^ 0xFF);
-                    flag = (flag | BitMasks.NoCrypto);
-                    g.Write((byte)flag);
-                    g.Flush();
-                }
-
-                Console.WriteLine("Press Enter to Exit...");
-                Console.Read();
-            }
-        }
-
-        /// <summary>
-        /// Writes wrong header values
-        /// </summary>
-        public void Encrypt()
-        {
-            if (!File.Exists(filename))
-                return;
-
-            Console.WriteLine(filename);
-
-            using (BinaryReader f = new BinaryReader(File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
-            using (BinaryWriter g = new BinaryWriter(File.Open(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)))
-            {
-                NCSDHeader header = NCSDHeader.Read(f);
-                if (header == null)
-                {
-                    Console.WriteLine("Error: Not a 3DS Rom!");
-                    return;
-                }
-
-                // Iterate over all 8 NCCH partitions
-                for (int p = 0; p < 8; p++)
-                {
-                    if (!header.PartitionsTable[p].IsValid())
-                    {
-                        Console.WriteLine("Partition {0} Not found... Skipping...", p);
-                        continue;
-                    }
-
-                    // Seek to the beginning of the NCCH partition
-                    f.BaseStream.Seek((header.PartitionsTable[p].Offset * header.SectorSize), SeekOrigin.Begin);
-
-                    NCCHHeader partitionHeader = NCCHHeader.Read(f);
-                    if (partitionHeader == null)
-                    {
-                        Console.WriteLine("Partition {0} Unable to read NCCH header", p);
-                        continue;
-                    }
-
-                    // Get the backup flags
-                    f.BaseStream.Seek(0x1188, SeekOrigin.Begin);
-                    NCCHHeaderFlags backupFlags = NCCHHeaderFlags.Read(f);
-
-                    // Check if the 'NoCrypto' bit is not set
-                    if ((partitionHeader.Flags.BitMasks & BitMasks.NoCrypto) == 0)
-                    {
-                        Console.WriteLine("Partition {0:d}: Already Encrypted?...", p);
-                        continue;
-                    }
-
-                    // PartitionID is used as IV joined with the content type.
-                    byte[] plainIV = partitionHeader.PartitionId.Concat(Constants.PlainCounter).ToArray(); // Get the IV for plain sector (TitleID + Plain Counter)
-                    byte[] exefsIV = partitionHeader.PartitionId.Concat(Constants.ExefsCounter).ToArray(); // Get the IV for ExeFS (TitleID + ExeFS Counter)
-                    byte[] romfsIV = partitionHeader.PartitionId.Concat(Constants.RomfsCounter).ToArray(); // Get the IV for RomFS (TitleID + RomFS Counter)
-
-                    BigInteger KeyX = 0;
-                    BigInteger KeyX2C = Constants.KeyX0x2C;
-                    BigInteger KeyY = new BigInteger(partitionHeader.RSA2048Signature.Take(16).Reverse().ToArray()); // KeyY is the first 16 bytes of the partition RSA-2048 SHA-256 signature
-
-                    BigInteger NormalKey = 0;
-                    BigInteger NormalKey2C = RotateLeft((RotateLeft(KeyX2C, 2, 128) ^ KeyY) + Constants.AESHardwareConstant, 87, 128);
-
-                    // Determine the Keys to be used
-                    if ((backupFlags.BitMasks & BitMasks.FixedCryptoKey) != 0)
-                    {
-                        NormalKey = 0x00;
-                        NormalKey2C = 0x00;
-                        if (p == 0)
-                            Console.WriteLine("Encryption Method: Zero Key");
-                    }
-                    else
-                    {
-                        if (backupFlags.CryptoMethod == CryptoMethod.Original)
-                        {
-                            KeyX = (development ? Constants.DevKeyX0x2C : Constants.KeyX0x2C);
-                            if (p == 0)
-                                Console.WriteLine("Encryption Method: Key 0x2C");
-                        }
-                        else if (backupFlags.CryptoMethod == CryptoMethod.Seven)
-                        {
-                            KeyX = (development ? Constants.KeyX0x25 : Constants.KeyX0x25);
-                            if (p == 0)
-                                Console.WriteLine("Encryption Method: Key 0x25");
-                        }
-                        else if (backupFlags.CryptoMethod == CryptoMethod.NineThree)
-                        {
-                            KeyX = (development ? Constants.DevKeyX0x18 : Constants.KeyX0x18);
-                            if (p == 0)
-                                Console.WriteLine("Encryption Method: Key 0x18");
-                        }
-                        else if (backupFlags.CryptoMethod == CryptoMethod.NineSix)
-                        {
-                            KeyX = (development ? Constants.DevKeyX0x1B : Constants.KeyX0x1B);
-                            if (p == 0)
-                                Console.WriteLine("Encryption Method: Key 0x1B");
-                        }
-
-                        NormalKey = RotateLeft((RotateLeft(KeyX, 2, 128) ^ KeyY) + Constants.AESHardwareConstant, 87, 128);
-                    }
-
-                    // Encrypt extended header, if it exists
-                    if (partitionHeader.ExtendedHeaderSizeInBytes > 0)
-                    {
-                        // Seek to the partition start and skip first part of the header
-                        f.BaseStream.Seek((header.PartitionsTable[p].Offset * header.SectorSize) + 0x200, SeekOrigin.Begin);
-                        g.BaseStream.Seek((header.PartitionsTable[p].Offset * header.SectorSize) + 0x200, SeekOrigin.Begin);
-
-                        var str = BitConverter.ToString(plainIV).Replace("-", "");
-
-                        var exefsctrmode2C = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                        exefsctrmode2C.Init(true, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey2C)), plainIV));
-
-                        Console.WriteLine("Partition {0} ExeFS: Encrypting: ExHeader", p);
-
-                        g.Write(exefsctrmode2C.ProcessBytes(f.ReadBytes(Constants.CXTExtendedDataHeaderLength)));
-                        g.Flush();
-                    }
-
-                    // Encrypt the ExeFS, if it exists
-                    if (partitionHeader.ExeFSSizeInBytes > 0)
-                    {
-                        f.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits) * header.SectorSize, SeekOrigin.Begin);
-                        g.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits) * header.SectorSize, SeekOrigin.Begin);
-
-                        var exefsctrmode2C = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                        exefsctrmode2C.Init(true, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey2C)), exefsIV));
-
-                        g.Write(exefsctrmode2C.ProcessBytes(f.ReadBytes((int)header.SectorSize)));
-                        g.Flush();
-
-                        Console.WriteLine("Partition {0} ExeFS: Encrypting: ExeFS Filename Table", p);
-
-                        if (backupFlags.CryptoMethod != CryptoMethod.Original)
-                        {
-                            f.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits) * header.SectorSize, SeekOrigin.Begin);
-                            ExeFSHeader exefsHeader = ExeFSHeader.Read(f);
-                            if (exefsHeader != null)
-                            {
-                                foreach (ExeFSFileHeader fileHeader in exefsHeader.FileHeaders)
-                                {
-                                    if (!fileHeader.IsCodeBinary)
-                                        continue;
-
-                                    uint datalenM = ((fileHeader.FileSize) / (1024 * 1024));
-                                    uint datalenB = ((fileHeader.FileSize) % (1024 * 1024));
-                                    uint ctroffset = ((fileHeader.FileOffset + header.SectorSize) / 0x10);
-
-                                    byte[] exefsIVWithOffsetForHeader = AddToByteArray(exefsIV, (int)ctroffset);
-
-                                    var exefsctrmode = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                                    exefsctrmode.Init(true, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey)), exefsIVWithOffsetForHeader));
-
-                                    exefsctrmode2C = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                                    exefsctrmode2C.Init(false, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey2C)), exefsIVWithOffsetForHeader));
-
-                                    f.BaseStream.Seek((((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits) + 1) * header.SectorSize) + fileHeader.FileOffset, SeekOrigin.Begin);
-                                    g.BaseStream.Seek((((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits) + 1) * header.SectorSize) + fileHeader.FileOffset, SeekOrigin.Begin);
-
-                                    if (datalenM > 0)
-                                    {
-                                        for (int i = 0; i < datalenM; i++)
-                                        {
-                                            g.Write(exefsctrmode2C.ProcessBytes(exefsctrmode.ProcessBytes(f.ReadBytes(1024 * 1024))));
-                                            g.Flush();
-                                            Console.Write("\rPartition {0} ExeFS: Encrypting: {1}... {2} / {3} mb...", p, fileHeader.FileName, i, datalenM + 1);
-                                        }
-                                    }
-
-                                    if (datalenB > 0)
-                                    {
-                                        g.Write(exefsctrmode2C.ProcessBytes(exefsctrmode.ProcessBytes(f.ReadBytes((int)datalenB))));
-                                        g.Flush();
-                                    }
-
-                                    Console.Write("\rPartition {0} ExeFS: Encrypting: {1}... {2} / {3} mb... Done!\r\n", p, fileHeader.FileName, datalenM + 1, datalenM + 1);
-                                }
-                            }
-                        }
-
-                        // decrypt exefs
-                        int exefsSizeM = (int)((partitionHeader.ExeFSSizeInMediaUnits - 1) * header.SectorSize) / (1024 * 1024);
-                        int exefsSizeB = (int)((partitionHeader.ExeFSSizeInMediaUnits - 1) * header.SectorSize) % (1024 * 1024);
-                        int ctroffsetE = (int)(header.SectorSize / 0x10);
-
-                        byte[] exefsIVWithOffset = AddToByteArray(exefsIV, ctroffsetE);
-
-                        exefsctrmode2C = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                        exefsctrmode2C.Init(true, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey2C)), exefsIVWithOffset));
-
-                        f.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits + 1) * header.SectorSize, SeekOrigin.Begin);
-                        g.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.ExeFSOffsetInMediaUnits + 1) * header.SectorSize, SeekOrigin.Begin);
-                        if (exefsSizeM > 0)
-                        {
-                            for (int i = 0; i < exefsSizeM; i++)
-                            {
-                                g.Write(exefsctrmode2C.ProcessBytes(f.ReadBytes(1024 * 1024)));
-                                g.Flush();
-                                Console.Write("\rPartition {0} ExeFS: Encrypting: {1} / {2} mb", p, i, exefsSizeM + 1);
-                            }
-                        }
-                        if (exefsSizeB > 0)
-                        {
-                            g.Write(exefsctrmode2C.ProcessBytes(f.ReadBytes(exefsSizeB)));
-                            g.Flush();
-                        }
-
-                        Console.Write("\rPartition {0} ExeFS: Encrypting: {1} / {2} mb... Done!\r\n", p, exefsSizeM + 1, exefsSizeM + 1);
-                    }
-                    else
-                    {
-                        Console.WriteLine("Partition {0} ExeFS: No Data... Skipping...", p);
-                    }
-
-                    if (partitionHeader.RomFSOffsetInMediaUnits != 0)
-                    {
-                        int romfsBlockSize = 16; // block size in mb
-                        int romfsSizeM = (int)(partitionHeader.RomFSSizeInMediaUnits * header.SectorSize) / (romfsBlockSize * (1024 * 1024));
-                        int romfsSizeB = (int)(partitionHeader.RomFSSizeInMediaUnits * header.SectorSize) % (romfsBlockSize * (1024 * 1024));
-                        int romfsSizeTotalMb = (int)((partitionHeader.RomFSSizeInMediaUnits * header.SectorSize) / (1024 * 1024) + 1);
-
-                        if (p > 0) // RomFS for partitions 1 and up always use Key0x2C
-                        {
-                            if ((backupFlags.BitMasks & BitMasks.FixedCryptoKey) != 0) // except if using zero-key
-                            {
-                                NormalKey = 0x00;
-                            }
-                            else
-                            {
-                                KeyX = KeyX = (development ? Constants.DevKeyX0x2C : Constants.KeyX0x2C);
-                                NormalKey = RotateLeft((RotateLeft(KeyX, 2, 128) ^ KeyY) + Constants.AESHardwareConstant, 87, 128);
-                            }
-                        }
-
-                        var romfsctrmode = CipherUtilities.GetCipher("AES/CTR"); // ("AES/CTR/NoPadding")
-                        romfsctrmode.Init(true, new ParametersWithIV(new KeyParameter(TakeSixteen(NormalKey)), romfsIV));
-
-                        f.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.RomFSOffsetInMediaUnits) * header.SectorSize, SeekOrigin.Begin);
-                        g.BaseStream.Seek((header.PartitionsTable[p].Offset + partitionHeader.RomFSOffsetInMediaUnits) * header.SectorSize, SeekOrigin.Begin);
-                        if (romfsSizeM > 0)
-                        {
-                            for (int i = 0; i < romfsSizeM; i++)
-                            {
-                                g.Write(romfsctrmode.ProcessBytes(f.ReadBytes(romfsBlockSize * 1024 * 1024)));
-                                g.Flush();
-                                Console.Write("\rPartition {0} RomFS: Encrypting: {1} / {2} mb", p, i * romfsBlockSize, romfsSizeTotalMb);
-                            }
-                        }
-                        if (romfsSizeB > 0)
-                        {
-                            g.Write(romfsctrmode.ProcessBytes(f.ReadBytes(romfsSizeB)));
-                            g.Flush();
-                        }
-
-                        Console.Write("\rPartition {0} RomFS: Encrypting: {1} / {2} mb... Done!\r\n", p, romfsSizeTotalMb, romfsSizeTotalMb);
-                    }
-                    else
-                    {
-                        Console.WriteLine("Partition {0} RomFS: No Data... Skipping...", p);
-                    }
-
-                    // Write the new CryptoMethod
-                    g.BaseStream.Seek((header.PartitionsTable[p].Offset * header.SectorSize) + 0x18B, SeekOrigin.Begin);
-                    if (p > 0)
-                    {
-                        g.Write((byte)CryptoMethod.Original); // For partitions 1 and up, set crypto-method to 0x00
-                        g.Flush();
-                    }
-                    else
-                    {
-                        g.Write((byte)backupFlags.CryptoMethod); // If partition 0, restore crypto-method from backup flags
-                        g.Flush();
-                    }
-                    
-                    // Write the new BitMasks flag
-                    g.BaseStream.Seek((header.PartitionsTable[p].Offset * header.SectorSize) + 0x18F, SeekOrigin.Begin);
-                    BitMasks flag = partitionHeader.Flags.BitMasks;
-                    flag = (flag & ((BitMasks.FixedCryptoKey | BitMasks.NewKeyYGenerator | BitMasks.NoCrypto) ^ (BitMasks)0xFF));
-                    flag = (flag | (BitMasks.FixedCryptoKey | BitMasks.NewKeyYGenerator) & backupFlags.BitMasks);
-                    g.Write((byte)flag);
-                    g.Flush();
-                }
-
-                Console.WriteLine("Press Enter to Exit...");
-                Console.Read();
-            }
-        }
-
-        private static BigInteger RotateLeft(BigInteger val, int r_bits, int max_bits)
-        {
-            return (val << r_bits % max_bits) & (BigInteger.Pow(2, max_bits) - 1) | ((val & (BigInteger.Pow(2, max_bits) - 1)) >> (max_bits - (r_bits % max_bits)));
-        }
-
-        private static string ToBytes(int num)
-        {
-            string numstr = "";
-            int tmp = num;
-
-            while (numstr.Length < 16)
-            {
-                numstr += (char)(tmp & 0xFF);
-                tmp >>= 8;
-            }
-
-            return numstr;
-        }
-
-        private static byte[] AddToByteArray(byte[] input, int add)
-        {
-            int len = input.Length;
-            var bigint = new BigInteger(input.Reverse().ToArray());
-            bigint += add;
-            var arr = bigint.ToByteArray().Reverse().ToArray();
-
-            if (arr.Length < len)
-            {
-                byte[] temp = new byte[len];
-                for (int i = 0; i < (len - arr.Length); i++)
-                    temp[i] = 0x00;
-
-                Array.Copy(arr, 0, temp, len - arr.Length, arr.Length);
-                arr = temp;
-            }
-
-            return arr;
-        }
-
-        private static byte[] TakeSixteen(BigInteger input)
-        {
-            var arr = input.ToByteArray().Take(16).Reverse().ToArray();
-
-            if (arr.Length < 16)
-            {
-                byte[] temp = new byte[16];
-                for (int i = 0; i < (16 - arr.Length); i++)
-                    temp[i] = 0x00;
-
-                Array.Copy(arr, 0, temp, 16 - arr.Length, arr.Length);
-                arr = temp;
-            }
-
-            return arr;
-        }
-    }
-}

3DSDecrypt/packages.config

@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<packages>
-  <package id="BouncyCastle" version="1.8.4" targetFramework="net461" />
-</packages>

LICENSE

@@ -0,0 +1,7 @@
+Copyright (c) 2018-2025 Matt Nadareski
+
+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 (including the next paragraph) shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 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.

NDecrypt.Core/Configuration.cs

@@ -0,0 +1,89 @@
+using System.IO;
+using Newtonsoft.Json;
+
+namespace NDecrypt.Core
+{
+    internal class Configuration
+    {
+        #region DS-Specific Fields
+
+        /// <summary>
+        /// Encryption data taken from woodsec
+        /// </summary>
+        public string? NitroEncryptionData { get; set; }
+
+        #endregion
+
+        #region 3DS-Specific Fields
+
+        /// <summary>
+        /// AES Hardware Constant
+        /// </summary>
+        /// <remarks>generator</remarks>
+        public string? AESHardwareConstant { get; set; }
+
+        /// <summary>
+        /// KeyX 0x18 (New 3DS 9.3)
+        /// </summary>
+        /// <remarks>slot0x18KeyX</remarks>
+        public string? KeyX0x18 { get; set; }
+
+        /// <summary>
+        /// Dev KeyX 0x18 (New 3DS 9.3)
+        /// </summary>
+        public string? DevKeyX0x18 { get; set; }
+
+        /// <summary>
+        /// KeyX 0x1B (New 3DS 9.6)
+        /// </summary>
+        /// <remarks>slot0x1BKeyX</remarks>
+        public string? KeyX0x1B { get; set; }
+
+        /// <summary>
+        /// Dev KeyX 0x1B New 3DS 9.6)
+        /// </summary>
+        public string? DevKeyX0x1B { get; set; }
+
+        /// <summary>
+        /// KeyX 0x25 (> 7.x)
+        /// </summary>
+        /// <remarks>slot0x25KeyX</remarks>
+        public string? KeyX0x25 { get; set; }
+
+        /// <summary>
+        /// Dev KeyX 0x25 (> 7.x)
+        /// </summary>
+        public string? DevKeyX0x25 { get; set; }
+
+        /// <summary>
+        /// KeyX 0x2C (< 6.x)
+        /// </summary>
+        /// <remarks>slot0x2CKeyX</remarks>
+        public string? KeyX0x2C { get; set; }
+
+        /// <summary>
+        /// Dev KeyX 0x2C (< 6.x)
+        /// </summary>
+        public string? DevKeyX0x2C { get; set; }
+
+        #endregion
+
+        public static Configuration? Create(string path)
+        {
+            // Ensure the file exists
+            if (!File.Exists(path))
+                return null;
+
+            // Parse the configuration directly
+            try
+            {
+                string contents = File.ReadAllText(path);
+                return JsonConvert.DeserializeObject<Configuration?>(contents);
+            }
+            catch
+            {
+                return null;
+            }
+        }
+    }
+}

NDecrypt.Core/DSTool.cs

@@ -0,0 +1,168 @@
+using System;
+using System.IO;
+using System.Text;
+#if NETFRAMEWORK || NETSTANDARD2_0_OR_GREATER
+using SabreTools.IO.Extensions;
+#endif
+using SabreTools.Serialization.Wrappers;
+
+namespace NDecrypt.Core
+{
+    public class DSTool : ITool
+    {
+        /// <summary>
+        /// Decryption args to use while processing
+        /// </summary>
+        private readonly DecryptArgs _decryptArgs;
+
+        public DSTool(DecryptArgs decryptArgs)
+        {
+            _decryptArgs = decryptArgs;
+        }
+
+        #region Encrypt
+
+        /// <inheritdoc/>
+        public bool EncryptFile(string input, string? output, bool force)
+        {
+            try
+            {
+                // If the output is provided, copy the input file
+                if (output is not null)
+                    File.Copy(input, output, overwrite: true);
+                else
+                    output = input;
+
+                // Open the output file for processing
+                using var reader = File.Open(output, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+
+                // Deserialize the cart information
+                var nitro = Nitro.Create(reader);
+                if (nitro is null)
+                {
+                    Console.WriteLine("Error: Not a DS or DSi Rom!");
+                    return false;
+                }
+
+                // Ensure the secure area was read
+                if (nitro.SecureArea is null)
+                {
+                    Console.WriteLine("Error: Invalid secure area!");
+                    return false;
+                }
+
+                // Encrypt the secure area
+                nitro.EncryptSecureArea(_decryptArgs.NitroEncryptionData, force);
+
+                // Write the encrypted secure area
+                using var writer = File.Open(output, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
+                writer.Seek(0x4000, SeekOrigin.Begin);
+                writer.Write(nitro.SecureArea);
+                writer.Flush();
+
+                return true;
+            }
+            catch
+            {
+                Console.WriteLine($"An error has occurred. {output} may be corrupted if it was partially processed.");
+                Console.WriteLine("Please check that the file was a valid DS or DSi file and try again.");
+                return false;
+            }
+        }
+
+        #endregion
+
+        #region Decrypt
+
+        /// <inheritdoc/>
+        public bool DecryptFile(string input, string? output, bool force)
+        {
+            try
+            {
+                // If the output is provided, copy the input file
+                if (output is not null)
+                    File.Copy(input, output, overwrite: true);
+                else
+                    output = input;
+
+                // Open the read and write on the same file for inplace processing
+                using var reader = File.Open(output, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+
+                // Deserialize the cart information
+                var nitro = Nitro.Create(reader);
+                if (nitro is null)
+                {
+                    Console.WriteLine("Error: Not a DS or DSi Rom!");
+                    return false;
+                }
+
+                // Ensure the secure area was read
+                if (nitro.SecureArea is null)
+                {
+                    Console.WriteLine("Error: Invalid secure area!");
+                    return false;
+                }
+
+                // Decrypt the secure area
+                nitro.DecryptSecureArea(_decryptArgs.NitroEncryptionData, force);
+
+                // Write the decrypted secure area
+                using var writer = File.Open(output, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
+                writer.Seek(0x4000, SeekOrigin.Begin);
+                writer.Write(nitro.SecureArea);
+                writer.Flush();
+
+                return true;
+            }
+            catch
+            {
+                Console.WriteLine($"An error has occurred. {output} may be corrupted if it was partially processed.");
+                Console.WriteLine("Please check that the file was a valid DS or DSi file and try again.");
+                return false;
+            }
+        }
+
+        #endregion
+
+        #region Info
+
+        /// <inheritdoc/>
+        public string? GetInformation(string filename)
+        {
+            try
+            {
+                // Open the file for reading
+                using var input = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+
+                // Deserialize the cart information
+                var cart = Nitro.Create(input);
+                if (cart?.Model is null)
+                    return "Error: Not a DS/DSi cart image!";
+
+                // Get a string builder for the status
+                var sb = new StringBuilder();
+                sb.Append("\tSecure Area: ");
+
+                // Get the encryption status
+                bool? decrypted = cart.CheckIfDecrypted(out _);
+                if (decrypted is null)
+                    sb.Append("Empty");
+                else if (decrypted == true)
+                    sb.Append("Decrypted");
+                else
+                    sb.Append("Encrypted");
+
+                // Return the status for the secure area
+                sb.Append(Environment.NewLine);
+                return sb.ToString();
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex);
+                return null;
+            }
+        }
+
+        #endregion
+    }
+}

NDecrypt.Core/DecryptArgs.cs

@@ -0,0 +1,391 @@
+using System;
+using System.IO;
+using SabreTools.Hashing;
+using SabreTools.IO.Encryption;
+using SabreTools.IO.Extensions;
+
+namespace NDecrypt.Core
+{
+    public class DecryptArgs
+    {
+        #region Common Fields
+
+        /// <summary>
+        /// Represents if all of the keys have been initialized properly
+        /// </summary>
+        public bool? IsReady { get; private set; }
+
+        #endregion
+
+        #region DS-Specific Fields
+
+        /// <summary>
+        /// Blowfish Table
+        /// </summary>
+        public byte[] NitroEncryptionData { get; private set; } = [];
+
+        #endregion
+
+        #region 3DS-Specific Fields
+
+        /// <summary>
+        /// AES Hardware Constant
+        /// </summary>
+        public byte[] AESHardwareConstant { get; private set; } = [];
+
+        /// <summary>
+        /// KeyX 0x18 (New 3DS 9.3)
+        /// </summary>
+        public byte[] KeyX0x18 { get; private set; } = [];
+
+        /// <summary>
+        /// Dev KeyX 0x18 (New 3DS 9.3)
+        /// </summary>
+        public byte[] DevKeyX0x18 { get; private set; } = [];
+
+        /// <summary>
+        /// KeyX 0x1B (New 3DS 9.6)
+        /// </summary>
+        public byte[] KeyX0x1B { get; private set; } = [];
+
+        /// <summary>
+        /// Dev KeyX 0x1B New 3DS 9.6)
+        /// </summary>
+        public byte[] DevKeyX0x1B { get; private set; } = [];
+
+        /// <summary>
+        /// KeyX 0x25 (> 7.x)
+        /// </summary>
+        public byte[] KeyX0x25 { get; private set; } = [];
+
+        /// <summary>
+        /// Dev KeyX 0x25 (> 7.x)
+        /// </summary>
+        public byte[] DevKeyX0x25 { get; private set; } = [];
+
+        /// <summary>
+        /// KeyX 0x2C (< 6.x)
+        /// </summary>
+        public byte[] KeyX0x2C { get; private set; } = [];
+
+        /// <summary>
+        /// Dev KeyX 0x2C (< 6.x)
+        /// </summary>
+        public byte[] DevKeyX0x2C { get; private set; } = [];
+
+        #endregion
+
+        #region Internal Test Values
+
+        /// <summary>
+        /// Expected hash for NitroEncryptionData
+        /// </summary>
+        private static readonly byte[] ExpectedNitroSha512Hash =
+        [
+            0x1A, 0xD6, 0x40, 0x21, 0xFC, 0x3D, 0x1A, 0x9A,
+            0x9B, 0xC0, 0x88, 0x8E, 0x2E, 0x68, 0xDE, 0x4E,
+            0x8A, 0x60, 0x6B, 0x86, 0x63, 0x22, 0xD2, 0xC7,
+            0xC6, 0xD7, 0xD6, 0xCE, 0x65, 0xF5, 0xBA, 0xA7,
+            0xEA, 0x69, 0x63, 0x7E, 0xC9, 0xE4, 0x57, 0x7B,
+            0x01, 0xFD, 0xCE, 0xC2, 0x26, 0x3B, 0xD9, 0x0D,
+            0x84, 0x57, 0xC2, 0x00, 0xB8, 0x56, 0x9F, 0xE5,
+            0x56, 0xDA, 0x8D, 0xDE, 0x84, 0xB8, 0x8E, 0xE4,
+        ];
+
+        /// <summary>
+        /// Initial value for key validation tests
+        /// </summary>
+        private static readonly byte[] TestIV =
+        [
+            0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+            0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+        ];
+
+        /// <summary>
+        /// Pattern to use for key validation tests
+        /// </summary>
+        private static readonly byte[] TestPattern =
+        [
+            0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
+            0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+            0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
+            0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+            0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
+            0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+            0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
+            0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+        ];
+
+        /// <summary>
+        /// Expected output value for KeyX0x18
+        /// </summary>
+        private static readonly byte[] ExpectedKeyX0x18 =
+        [
+            0x06, 0xF1, 0xB2, 0x3B, 0x12, 0xAD, 0x80, 0xC1,
+            0x13, 0xC6, 0x18, 0x3D, 0x27, 0xB8, 0xB9, 0x95,
+            0x49, 0x73, 0x59, 0x82, 0xEF, 0xFE, 0x16, 0x48,
+            0x91, 0x2A, 0x89, 0x55, 0x9A, 0xDC, 0x3C, 0xA0,
+            0x84, 0x46, 0x14, 0xE0, 0x16, 0x59, 0x8E, 0x4F,
+            0xC2, 0x6C, 0x52, 0xA4, 0x7D, 0xAD, 0x4F, 0x23,
+            0xF1, 0xC6, 0x99, 0x44, 0x39, 0xB7, 0x42, 0xF0,
+            0x1F, 0xBB, 0x02, 0xF6, 0x0A, 0x8A, 0xC2, 0x9A,
+        ];
+
+        /// <summary>
+        /// Expected output value for DevKeyX0x18
+        /// </summary>
+        private static readonly byte[] ExpectedDevKeyX0x18 =
+        [
+            0x99, 0x6E, 0x3C, 0x54, 0x97, 0x3C, 0xEA, 0xE8,
+            0xBA, 0xAE, 0x18, 0x5C, 0x93, 0x27, 0x65, 0x50,
+            0xF6, 0x6D, 0x67, 0xD7, 0xEF, 0xBD, 0x7C, 0xCB,
+            0x8A, 0xC1, 0x1A, 0x54, 0xFC, 0x3B, 0x8B, 0x3A,
+            0x0E, 0xE5, 0xEF, 0x27, 0x4A, 0x73, 0x7E, 0x0A,
+            0x2E, 0x2E, 0x9D, 0xAF, 0x6C, 0x03, 0xF2, 0x91,
+            0xC4, 0xFA, 0x73, 0xFD, 0x6B, 0xA0, 0x07, 0xD4,
+            0x75, 0x5B, 0x6F, 0x2E, 0x8B, 0x68, 0x4C, 0xD1,
+        ];
+
+        /// <summary>
+        /// Expected output value for KeyX0x1B
+        /// </summary>
+        private static readonly byte[] ExpectedKeyX0x1B =
+        [
+            0x0A, 0xE4, 0x79, 0x02, 0x1B, 0xFA, 0x25, 0x4B,
+            0x2D, 0x92, 0x4F, 0xA8, 0x41, 0x59, 0xCE, 0x10,
+            0x09, 0xE6, 0x08, 0x61, 0x23, 0xC7, 0xD2, 0x30,
+            0x84, 0x37, 0xD5, 0x49, 0x42, 0x94, 0xB2, 0x70,
+            0x6A, 0xF3, 0x75, 0xB0, 0x1F, 0x4F, 0xA1, 0xCE,
+            0x03, 0xA2, 0x6A, 0x19, 0x5D, 0x32, 0x0D, 0xB5,
+            0x79, 0xCD, 0xFD, 0xF0, 0xDE, 0x49, 0x26, 0x2D,
+            0x29, 0x36, 0x30, 0x69, 0x8B, 0x45, 0xE1, 0xFC,
+        ];
+
+        /// <summary>
+        /// Expected output value for DevKeyX0x1B
+        /// </summary>
+        private static readonly byte[] ExpectedDevKeyX0x1B =
+        [
+            0x16, 0x4F, 0xD9, 0x58, 0xC9, 0x20, 0xB3, 0xED,
+            0xC4, 0xEB, 0x57, 0x39, 0x10, 0xEF, 0xA8, 0xCC,
+            0xE5, 0x49, 0xBF, 0x52, 0x10, 0xA9, 0xCC, 0xE1,
+            0x65, 0x3B, 0x2D, 0x51, 0x45, 0xFB, 0x60, 0x52,
+            0x3E, 0x29, 0xEB, 0xEB, 0x3F, 0xF2, 0x76, 0x08,
+            0x00, 0x05, 0x7F, 0x64, 0x29, 0x4A, 0x17, 0x22,
+            0x56, 0x7F, 0x49, 0x94, 0x1A, 0x8C, 0x56, 0x35,
+            0x38, 0xBE, 0xA4, 0x2E, 0x58, 0xD3, 0x81, 0x8C,
+        ];
+
+        /// <summary>
+        /// Expected output value for KeyX0x25
+        /// </summary>
+        private static readonly byte[] ExpectedKeyX0x25 =
+        [
+            0x37, 0xBC, 0x73, 0xD6, 0xEE, 0x73, 0xE0, 0x94,
+            0x42, 0x84, 0x74, 0xE5, 0xD8, 0xFB, 0x5F, 0x65,
+            0xF4, 0xCF, 0x2E, 0xC1, 0x43, 0x48, 0x6C, 0xAA,
+            0xC8, 0xF9, 0x96, 0xE6, 0x33, 0xDD, 0xE7, 0xBF,
+            0xD2, 0x21, 0x89, 0x39, 0x13, 0xD1, 0xEC, 0xCA,
+            0x1D, 0x5D, 0x1F, 0x77, 0x95, 0xD2, 0x8B, 0x27,
+            0x92, 0x79, 0xC5, 0x1D, 0x72, 0xA7, 0x28, 0x57,
+            0x41, 0x0E, 0x46, 0xB8, 0x80, 0x7B, 0x7C, 0x0D,
+        ];
+
+        /// <summary>
+        /// Expected output value for DevKeyX0x25
+        /// </summary>
+        private static readonly byte[] ExpectedDevKeyX0x25 =
+        [
+            0x71, 0x65, 0x30, 0xF2, 0x68, 0xEC, 0x65, 0x0A,
+            0x8C, 0x9E, 0xC5, 0x5A, 0xFA, 0x37, 0x8E, 0xDA,
+            0x7B, 0x58, 0x3B, 0x66, 0x7C, 0x9D, 0x16, 0xD9,
+            0x2D, 0x8F, 0xCF, 0x04, 0x66, 0x7F, 0x27, 0x41,
+            0xBF, 0x5F, 0x1E, 0x11, 0x4C, 0xD6, 0xB9, 0x0A,
+            0xC5, 0x42, 0xCF, 0x2B, 0x87, 0x6B, 0xD4, 0x72,
+            0x4D, 0x9C, 0x29, 0x2E, 0xF8, 0xB0, 0x6F, 0x22,
+            0x35, 0x5B, 0x96, 0x83, 0xD1, 0xE4, 0x5E, 0xDB,
+        ];
+
+        /// <summary>
+        /// Expected output value for KeyX0x2C
+        /// </summary>
+        private static readonly byte[] ExpectedKeyX0x2C =
+        [
+            0xAE, 0x44, 0x20, 0xDB, 0xA5, 0x96, 0xDC, 0xF3,
+            0xD8, 0x23, 0x9E, 0x3C, 0x44, 0x73, 0x3D, 0xCD,
+            0x07, 0xD5, 0xF8, 0xD0, 0xC6, 0xB3, 0x5A, 0x80,
+            0xB5, 0x5A, 0x55, 0x30, 0x5D, 0x4A, 0xBE, 0x61,
+            0xBF, 0xEF, 0x64, 0x17, 0x28, 0xD6, 0x26, 0x52,
+            0x42, 0x4D, 0x8F, 0x1C, 0xBC, 0x63, 0xD3, 0x91,
+            0x7D, 0xA6, 0x4F, 0xAF, 0x26, 0x38, 0x60, 0xEE,
+            0x79, 0x92, 0x2F, 0xD8, 0xCA, 0x4E, 0xE7, 0xEC,
+        ];
+
+        /// <summary>
+        /// Expected output value for DevKeyX0x2C
+        /// </summary>
+        private static readonly byte[] ExpectedDevKeyX0x2C =
+        [
+            0x5F, 0x73, 0xD5, 0x9A, 0x67, 0xFF, 0x8C, 0x12,
+            0x31, 0x58, 0x0B, 0x58, 0x46, 0xFE, 0x05, 0x16,
+            0x92, 0xE4, 0x84, 0x06, 0x18, 0x9B, 0x58, 0x91,
+            0xE7, 0xF8, 0xCD, 0xA9, 0x95, 0xAC, 0x07, 0xCD,
+            0x43, 0x20, 0x7A, 0x8C, 0xCC, 0xAB, 0x48, 0x50,
+            0x29, 0x2F, 0x96, 0x73, 0xB0, 0xD9, 0xE5, 0xCB,
+            0xE6, 0x9A, 0x0D, 0xF7, 0xD0, 0x1E, 0xC2, 0xEC,
+            0xC1, 0xE2, 0x8E, 0xEE, 0x89, 0xB9, 0xB1, 0x97,
+        ];
+
+        #endregion
+
+        /// <summary>
+        /// Setup all of the necessary constants
+        /// </summary>
+        /// <param name="keyfile">Path to the keyfile</param>
+        public DecryptArgs(string? config)
+        {
+            if (config is null || !File.Exists(config))
+            {
+                IsReady = false;
+                return;
+            }
+
+            // Try to read the configuration file
+            var configObj = Configuration.Create(config);
+            if (configObj is null)
+            {
+                IsReady = false;
+                return;
+            }
+
+            // Set the fields from the configuration
+            NitroEncryptionData = configObj.NitroEncryptionData.FromHexString() ?? [];
+            AESHardwareConstant = configObj.AESHardwareConstant.FromHexString() ?? [];
+            KeyX0x18 = configObj.KeyX0x18.FromHexString() ?? [];
+            KeyX0x1B = configObj.KeyX0x1B.FromHexString() ?? [];
+            KeyX0x25 = configObj.KeyX0x25.FromHexString() ?? [];
+            KeyX0x2C = configObj.KeyX0x2C.FromHexString() ?? [];
+            DevKeyX0x18 = configObj.DevKeyX0x18.FromHexString() ?? [];
+            DevKeyX0x1B = configObj.DevKeyX0x1B.FromHexString() ?? [];
+            DevKeyX0x25 = configObj.DevKeyX0x25.FromHexString() ?? [];
+            DevKeyX0x2C = configObj.DevKeyX0x2C.FromHexString() ?? [];
+
+            IsReady = true;
+            ValidateKeys();
+        }
+
+        /// <summary>
+        /// Validate that all keys provided are going to be valid
+        /// </summary>
+        /// <remarks>Does not know what the keys are, just the result</remarks>
+        private void ValidateKeys()
+        {
+            // NitroEncryptionData
+            if (NitroEncryptionData.Length > 0)
+            {
+                byte[]? actual = HashTool.GetByteArrayHashArray(NitroEncryptionData, HashType.SHA512);
+                if (actual is null || !actual.EqualsExactly(ExpectedNitroSha512Hash))
+                {
+                    Console.WriteLine($"NitroEncryptionData invalid value, disabling...");
+                    NitroEncryptionData = [];
+                }
+            }
+
+            // KeyX0x18
+            if (KeyX0x18.Length > 0)
+            {
+                var cipher = AESCTR.CreateEncryptionCipher(KeyX0x18, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                if (!actual.EqualsExactly(ExpectedKeyX0x18))
+                {
+                    Console.WriteLine($"KeyX0x18 invalid value, disabling...");
+                    KeyX0x18 = [];
+                }
+            }
+
+            // DevKeyX0x18
+            if (DevKeyX0x18.Length > 0)
+            {
+                var cipher = AESCTR.CreateEncryptionCipher(DevKeyX0x18, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                if (!actual.EqualsExactly(ExpectedDevKeyX0x18))
+                {
+                    Console.WriteLine($"DevKeyX0x18 invalid value, disabling...");
+                    DevKeyX0x18 = [];
+                }
+            }
+
+            // KeyX0x1B
+            if (KeyX0x1B.Length > 0)
+            {
+                var cipher = AESCTR.CreateEncryptionCipher(KeyX0x1B, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                if (!actual.EqualsExactly(ExpectedKeyX0x1B))
+                {
+                    Console.WriteLine($"KeyX0x1B invalid value, disabling...");
+                    KeyX0x1B = [];
+                }
+            }
+
+            // DevKeyX0x1B
+            if (DevKeyX0x1B.Length > 0)
+            {
+                var cipher = AESCTR.CreateEncryptionCipher(DevKeyX0x1B, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                if (!actual.EqualsExactly(ExpectedDevKeyX0x1B))
+                {
+                    Console.WriteLine($"DevKeyX0x1B invalid value, disabling...");
+                    DevKeyX0x1B = [];
+                }
+            }
+
+            // KeyX0x25
+            if (KeyX0x25.Length > 0)
+            {
+                var cipher = AESCTR.CreateEncryptionCipher(KeyX0x25, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                if (!actual.EqualsExactly(ExpectedKeyX0x25))
+                {
+                    Console.WriteLine($"KeyX0x25 invalid value, disabling...");
+                    KeyX0x25 = [];
+                }
+            }
+
+            // DevKeyX0x25
+            if (DevKeyX0x25.Length > 0)
+            {
+                var cipher = AESCTR.CreateEncryptionCipher(DevKeyX0x25, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                if (!actual.EqualsExactly(ExpectedDevKeyX0x25))
+                {
+                    Console.WriteLine($"DevKeyX0x25 invalid value, disabling...");
+                    DevKeyX0x25 = [];
+                }
+            }
+
+            // KeyX0x2C
+            if (KeyX0x2C.Length > 0)
+            {
+                var cipher = AESCTR.CreateEncryptionCipher(KeyX0x2C, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                if (!actual.EqualsExactly(ExpectedKeyX0x2C))
+                {
+                    Console.WriteLine($"KeyX0x2C invalid value, disabling...");
+                    KeyX0x2C = [];
+                }
+            }
+
+            // DevKeyX0x2C
+            if (DevKeyX0x2C.Length > 0)
+            {
+                var cipher = AESCTR.CreateEncryptionCipher(DevKeyX0x2C, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                if (!actual.EqualsExactly(ExpectedDevKeyX0x2C))
+                {
+                    Console.WriteLine($"DevKeyX0x2C invalid value, disabling...");
+                    DevKeyX0x2C = [];
+                }
+            }
+        }
+    }
+}

NDecrypt.Core/ITool.cs

@@ -0,0 +1,32 @@
+namespace NDecrypt.Core
+{
+    public interface ITool
+    {
+        /// <summary>
+        /// Attempts to encrypt an input file
+        /// </summary>
+        /// <param name="input">Name of the file to encrypt</param>
+        /// <param name="output">Optional name of the file to write to</param>
+        /// <param name="force">Indicates if the operation should be forced</param>
+        /// <returns>True if the file could be encrypted, false otherwise</returns>
+        /// <remarks>If an output filename is not provided, the input file will be overwritten</remarks>
+        public bool EncryptFile(string input, string? output, bool force);
+
+        /// <summary>
+        /// Attempts to decrypt an input file
+        /// </summary>
+        /// <param name="input">Name of the file to decrypt</param>
+        /// <param name="output">Optional name of the file to write to</param>
+        /// <param name="force">Indicates if the operation should be forced</param>
+        /// <returns>True if the file could be decrypted, false otherwise</returns>
+        /// <remarks>If an output filename is not provided, the input file will be overwritten</remarks>
+        public bool DecryptFile(string input, string? output, bool force);
+
+        /// <summary>
+        /// Attempts to get information on an input file
+        /// </summary>
+        /// <param name="filename">Name of the file get information on</param>
+        /// <returns>String representing the info, null on error</returns>
+        public string? GetInformation(string filename);
+    }
+}

NDecrypt.Core/NDecrypt.Core.csproj

@@ -0,0 +1,32 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <!-- Assembly Properties -->
+        <TargetFrameworks>net20;net35;net40;net452;net462;net472;net48;netcoreapp3.1;net5.0;net6.0;net7.0;net8.0;net9.0;net10.0;netstandard2.0;netstandard2.1</TargetFrameworks>
+        <CheckEolTargetFramework>false</CheckEolTargetFramework>
+        <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
+        <IncludeSymbols>true</IncludeSymbols>
+        <LangVersion>latest</LangVersion>
+        <Nullable>enable</Nullable>
+        <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
+        <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+        <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+        <VersionPrefix>0.5.0</VersionPrefix>
+
+        <!-- Package Properties -->
+        <Authors>Matt Nadareski</Authors>
+        <Description>Common code for all NDecrypt processors</Description>
+        <Copyright>Copyright (c) Matt Nadareski 2019-2025</Copyright>
+        <PackageLicenseExpression>MIT</PackageLicenseExpression>
+        <PackageProjectUrl>https://github.com/SabreTools/</PackageProjectUrl>
+        <RepositoryUrl>https://github.com/SabreTools/NDecrypt</RepositoryUrl>
+        <RepositoryType>git</RepositoryType>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="SabreTools.Hashing" Version="[1.6.0]" />
+        <PackageReference Include="SabreTools.IO" Version="[1.9.0]" />
+        <PackageReference Include="SabreTools.Serialization" Version="[2.2.1]" />
+    </ItemGroup>
+
+</Project>

NDecrypt.Core/PartitionKeys.cs

@@ -0,0 +1,138 @@
+using System;
+using SabreTools.Data.Models.N3DS;
+using SabreTools.IO.Extensions;
+
+namespace NDecrypt.Core
+{
+    /// <summary>
+    /// Set of all keys associated with a partition
+    /// </summary>
+    public class PartitionKeys
+    {
+        public byte[] KeyX { get; private set; }
+
+        public byte[] KeyX2C { get; }
+
+        public byte[] KeyY { get; }
+
+        public byte[] NormalKey { get; private set; }
+
+        public byte[] NormalKey2C { get; }
+
+        /// <summary>
+        /// Decryption args to use while processing
+        /// </summary>
+        private readonly DecryptArgs _decryptArgs;
+
+        /// <summary>
+        /// Indicates if development images are expected
+        /// </summary>
+        private readonly bool _development;
+
+        /// <summary>
+        /// Create a new set of keys for a given partition
+        /// </summary>
+        /// <param name="args">Decryption args representing available keys</param>
+        /// <param name="signature">RSA-2048 signature from the partition</param>
+        /// <param name="masks">BitMasks from the partition or backup header</param>
+        /// <param name="method">CryptoMethod from the partition or backup header</param>
+        /// <param name="development">Determine if development keys are used</param>
+        public PartitionKeys(DecryptArgs args, byte[]? signature, BitMasks masks, CryptoMethod method, bool development)
+        {
+            // Validate inputs
+            if (args.IsReady != true)
+                throw new InvalidOperationException($"{nameof(args)} must be initialized before use");
+            if (signature is not null && signature.Length < 16)
+                throw new ArgumentOutOfRangeException(nameof(signature), $"{nameof(signature)} must be at least 16 bytes");
+
+            // Set fields for future use
+            _decryptArgs = args;
+            _development = development;
+
+            // Set the standard KeyX values
+            KeyX = new byte[16];
+            KeyX2C = development ? args.DevKeyX0x2C : args.KeyX0x2C;
+
+            // Backup headers can't have a KeyY value set
+            KeyY = new byte[16];
+            if (signature is not null)
+                Array.Copy(signature, KeyY, 16);
+
+            // Set the standard normal key values
+            NormalKey = new byte[16];
+
+            NormalKey2C = KeyX2C.RotateLeft(2);
+            NormalKey2C = NormalKey2C.Xor(KeyY);
+            NormalKey2C = NormalKey2C.Add(add: args.AESHardwareConstant);
+            NormalKey2C = NormalKey2C.RotateLeft(87);
+
+            // Special case for zero-key
+#if NET20 || NET35
+            if ((masks & BitMasks.FixedCryptoKey) > 0)
+#else
+            if (masks.HasFlag(BitMasks.FixedCryptoKey))
+#endif
+            {
+                Console.WriteLine("Encryption Method: Zero Key");
+                NormalKey = new byte[16];
+                NormalKey2C = new byte[16];
+                return;
+            }
+
+            // Set KeyX values based on crypto method
+            switch (method)
+            {
+                case CryptoMethod.Original:
+                    Console.WriteLine("Encryption Method: Key 0x2C");
+                    KeyX = development ? args.DevKeyX0x2C : args.KeyX0x2C;
+                    break;
+
+                case CryptoMethod.Seven:
+                    Console.WriteLine("Encryption Method: Key 0x25");
+                    KeyX = development ? args.DevKeyX0x25 : args.KeyX0x25;
+                    break;
+
+                case CryptoMethod.NineThree:
+                    Console.WriteLine("Encryption Method: Key 0x18");
+                    KeyX = development ? args.DevKeyX0x18 : args.KeyX0x18;
+                    break;
+
+                case CryptoMethod.NineSix:
+                    Console.WriteLine("Encryption Method: Key 0x1B");
+                    KeyX = development ? args.DevKeyX0x1B : args.KeyX0x1B;
+                    break;
+            }
+
+            // Set the normal key based on the new KeyX value
+            NormalKey = KeyX.RotateLeft(2);
+            NormalKey = NormalKey.Xor(KeyY);
+            NormalKey = NormalKey.Add(args.AESHardwareConstant);
+            NormalKey = NormalKey.RotateLeft(87);
+        }
+
+        /// <summary>
+        /// Set RomFS values based on the bit masks
+        /// </summary>
+        public void SetRomFSValues(BitMasks masks)
+        {
+            // NormalKey has a constant value for zero-key
+#if NET20 || NET35
+            if ((masks & BitMasks.FixedCryptoKey) > 0)
+#else
+            if (masks.HasFlag(BitMasks.FixedCryptoKey))
+#endif
+            {
+                NormalKey = new byte[16];
+                return;
+            }
+
+            // Encrypting RomFS for partitions 1 and up always use Key0x2C
+            KeyX = _development ? _decryptArgs.DevKeyX0x2C : _decryptArgs.KeyX0x2C;
+
+            NormalKey = KeyX.RotateLeft(2);
+            NormalKey = NormalKey.Xor(KeyY);
+            NormalKey = NormalKey.Add(_decryptArgs.AESHardwareConstant);
+            NormalKey = NormalKey.RotateLeft(87);
+        }
+    }
+}

NDecrypt.Core/ThreeDSTool.cs

@@ -0,0 +1,929 @@
+using System;
+using System.IO;
+using System.Text;
+using SabreTools.Data.Models.N3DS;
+using SabreTools.IO.Encryption;
+using SabreTools.IO.Extensions;
+using SabreTools.Serialization.Wrappers;
+using static SabreTools.Data.Models.N3DS.Constants;
+
+namespace NDecrypt.Core
+{
+    public class ThreeDSTool : ITool
+    {
+        /// <summary>
+        /// Decryption args to use while processing
+        /// </summary>
+        private readonly DecryptArgs _decryptArgs;
+
+        /// <summary>
+        /// Indicates if development images are expected
+        /// </summary>
+        private readonly bool _development;
+
+        /// <summary>
+        /// Set of all partition keys
+        /// </summary>
+        private readonly PartitionKeys[] _keysMap = new PartitionKeys[8];
+
+        public ThreeDSTool(bool development, DecryptArgs decryptArgs)
+        {
+            _development = development;
+            _decryptArgs = decryptArgs;
+        }
+
+        #region Decrypt
+
+        /// <inheritdoc/>
+        public bool DecryptFile(string input, string? output, bool force)
+        {
+            // Ensure the constants are all set
+            if (_decryptArgs.IsReady != true)
+            {
+                Console.WriteLine("Could not read keys. Please make sure the file exists and try again.");
+                return false;
+            }
+
+            try
+            {
+                // If the output is provided, copy the input file
+                if (output is not null)
+                    File.Copy(input, output, overwrite: true);
+                else
+                    output = input;
+
+                // Open the output file for processing
+                using var reader = File.Open(output, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+                using var writer = File.Open(output, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
+
+                // Deserialize the cart information
+                var cart = N3DS.Create(reader);
+                if (cart?.Model is null)
+                {
+                    Console.WriteLine("Error: Not a 3DS cart image!");
+                    return false;
+                }
+
+                // Decrypt all 8 NCCH partitions
+                DecryptAllPartitions(cart, force, reader, writer);
+                return true;
+            }
+            catch
+            {
+                Console.WriteLine($"An error has occurred. {output} may be corrupted if it was partially processed.");
+                Console.WriteLine("Please check that the file was a valid 3DS or New 3DS cart image and try again.");
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Decrypt all partitions in the partition table of an NCSD header
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="force">Indicates if the operation should be forced</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private void DecryptAllPartitions(N3DS cart, bool force, Stream reader, Stream writer)
+        {
+            // Check the partitions table
+            if (cart.PartitionsTable is null || cart.Partitions is null)
+            {
+                Console.WriteLine("Invalid partitions table!");
+                return;
+            }
+
+            // Iterate over all 8 NCCH partitions
+            for (int p = 0; p < 8; p++)
+            {
+                var partition = cart.Partitions[p];
+                if (partition is null || partition.MagicID != NCCHMagicNumber)
+                {
+                    Console.WriteLine($"Partition {p} Not found... Skipping...");
+                    continue;
+                }
+
+                // Check the partition has data
+                var partitionEntry = cart.PartitionsTable[p];
+                if (partitionEntry is null || partitionEntry.Length == 0)
+                {
+                    Console.WriteLine($"Partition {p} No data... Skipping...");
+                    continue;
+                }
+
+                // Decrypt the partition, if possible
+                if (ShouldDecryptPartition(cart, p, force))
+                    DecryptPartition(cart, p, reader, writer);
+            }
+        }
+
+        /// <summary>
+        /// Determine if the current partition should be decrypted
+        /// </summary>s
+        private static bool ShouldDecryptPartition(N3DS cart, int index, bool force)
+        {
+            // If we're forcing the operation, tell the user
+            if (force)
+            {
+                Console.WriteLine($"Partition {index} is not verified due to force flag being set.");
+                return true;
+            }
+            // If we're not forcing the operation, check if the 'NoCrypto' bit is set
+            else if (cart.PossiblyDecrypted(index))
+            {
+                Console.WriteLine($"Partition {index}: Already Decrypted?...");
+                return false;
+            }
+
+            // By default, it passes
+            return true;
+        }
+
+        /// <summary>
+        /// Decrypt a single partition
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private void DecryptPartition(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            // Determine the keys needed for this partition
+            SetDecryptionKeys(cart, index);
+
+            // Decrypt the parts of the partition
+            DecryptExtendedHeader(cart, index, reader, writer);
+            DecryptExeFS(cart, index, reader, writer);
+            DecryptRomFS(cart, index, reader, writer);
+
+            // Update the flags
+            UpdateDecryptCryptoAndMasks(cart, index, writer);
+        }
+
+        /// <summary>
+        /// Determine the set of keys to be used for decryption
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        private void SetDecryptionKeys(N3DS cart, int index)
+        {
+            // Get the partition
+            var partition = cart.Partitions?[index];
+            if (partition?.Flags is null)
+                return;
+
+            // Get partition-specific values
+            byte[]? rsaSignature = partition.RSA2048Signature;
+            BitMasks masks = cart.GetBitMasks(index);
+            CryptoMethod method = cart.GetCryptoMethod(index);
+
+            // Get the partition keys
+            _keysMap[index] = new PartitionKeys(_decryptArgs, rsaSignature, masks, method, _development);
+        }
+
+        /// <summary>
+        /// Decrypt the extended header, if it exists
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private bool DecryptExtendedHeader(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            // Get required offsets
+            uint partitionOffset = cart.GetPartitionOffset(index);
+            if (partitionOffset == 0 || partitionOffset > reader.Length)
+            {
+                Console.WriteLine($"Partition {index} No Data... Skipping...");
+                return false;
+            }
+
+            uint extHeaderSize = cart.GetExtendedHeaderSize(index);
+            if (extHeaderSize == 0)
+            {
+                Console.WriteLine($"Partition {index} No Extended Header... Skipping...");
+                return false;
+            }
+
+            // Seek to the extended header
+            reader.Seek(partitionOffset + 0x200, SeekOrigin.Begin);
+            writer.Seek(partitionOffset + 0x200, SeekOrigin.Begin);
+
+            Console.WriteLine($"Partition {index}: Decrypting - ExHeader");
+
+            // Create the Plain AES cipher for this partition
+            var cipher = AESCTR.CreateDecryptionCipher(_keysMap[index].NormalKey2C, cart.PlainIV(index));
+
+            // Process the extended header
+            AESCTR.PerformOperation(Constants.CXTExtendedDataHeaderLength, cipher, reader, writer, null);
+
+#if NET6_0_OR_GREATER
+            // In .NET 6.0, this operation is not picked up by the reader, so we have to force it to reload its buffer
+            reader.Seek(0, SeekOrigin.Begin);
+#endif
+            writer.Flush();
+            return true;
+        }
+
+        /// <summary>
+        /// Decrypt the ExeFS, if it exists
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private bool DecryptExeFS(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            // Validate the ExeFS
+            uint exeFsHeaderOffset = cart.GetExeFSOffset(index);
+            if (exeFsHeaderOffset == 0 || exeFsHeaderOffset > reader.Length)
+            {
+                Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
+                return false;
+            }
+
+            uint exeFsSize = cart.GetExeFSSize(index);
+            if (exeFsSize == 0)
+            {
+                Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
+                return false;
+            }
+
+            // Decrypt the filename table
+            DecryptExeFSFilenameTable(cart, index, reader, writer);
+
+            // For all but the original crypto method, process each of the files in the table
+            if (cart.GetCryptoMethod(index) != CryptoMethod.Original)
+                DecryptExeFSFileEntries(cart, index, reader, writer);
+
+            // Get the ExeFS files offset
+            uint exeFsFilesOffset = exeFsHeaderOffset + cart.MediaUnitSize;
+
+            // Seek to the ExeFS
+            reader.Seek(exeFsFilesOffset, SeekOrigin.Begin);
+            writer.Seek(exeFsFilesOffset, SeekOrigin.Begin);
+
+            // Create the ExeFS AES cipher for this partition
+            uint ctroffsetE = cart.MediaUnitSize / 0x10;
+            byte[] exefsIVWithOffset = cart.ExeFSIV(index).Add(ctroffsetE);
+            var cipher = AESCTR.CreateDecryptionCipher(_keysMap[index].NormalKey2C, exefsIVWithOffset);
+
+            // Setup and perform the decryption
+            exeFsSize -= cart.MediaUnitSize;
+            AESCTR.PerformOperation(exeFsSize,
+                cipher,
+                reader,
+                writer,
+                s => Console.WriteLine($"\rPartition {index} ExeFS: Decrypting - {s}"));
+
+            return true;
+        }
+
+        /// <summary>
+        /// Decrypt the ExeFS Filename Table
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private void DecryptExeFSFilenameTable(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            // Get ExeFS offset
+            uint exeFsOffset = cart.GetExeFSOffset(index);
+            if (exeFsOffset == 0 || exeFsOffset > reader.Length)
+            {
+                Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
+                return;
+            }
+
+            // Seek to the ExeFS header
+            reader.Seek(exeFsOffset, SeekOrigin.Begin);
+            writer.Seek(exeFsOffset, SeekOrigin.Begin);
+
+            Console.WriteLine($"Partition {index} ExeFS: Decrypting - ExeFS Filename Table");
+
+            // Create the ExeFS AES cipher for this partition
+            var cipher = AESCTR.CreateDecryptionCipher(_keysMap[index].NormalKey2C, cart.ExeFSIV(index));
+
+            // Process the filename table
+            byte[] readBytes = reader.ReadBytes((int)cart.MediaUnitSize);
+            byte[] processedBytes = cipher.ProcessBytes(readBytes);
+            writer.Write(processedBytes);
+
+#if NET6_0_OR_GREATER
+            // In .NET 6.0, this operation is not picked up by the reader, so we have to force it to reload its buffer
+            reader.Seek(0, SeekOrigin.Begin);
+#endif
+            writer.Flush();
+        }
+
+        /// <summary>
+        /// Decrypt the ExeFS file entries
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private void DecryptExeFSFileEntries(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            if (cart.ExeFSHeaders is null || index < 0 || index > cart.ExeFSHeaders.Length)
+            {
+                Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
+                return;
+            }
+
+            // Reread the decrypted ExeFS header
+            uint exeFsHeaderOffset = cart.GetExeFSOffset(index);
+            reader.Seek(exeFsHeaderOffset, SeekOrigin.Begin);
+            cart.ExeFSHeaders[index] = SabreTools.Serialization.Readers.N3DS.ParseExeFSHeader(reader);
+
+            // Get the ExeFS header
+            var exeFsHeader = cart.ExeFSHeaders[index];
+            if (exeFsHeader?.FileHeaders is null)
+            {
+                Console.WriteLine($"Partition {index} ExeFS header does not exist. Skipping...");
+                return;
+            }
+
+            // Get the ExeFS files offset
+            uint exeFsFilesOffset = exeFsHeaderOffset + cart.MediaUnitSize;
+
+            // Loop through and process all headers
+            for (int i = 0; i < exeFsHeader.FileHeaders.Length; i++)
+            {
+                // Only attempt to process code binary files
+                if (!cart.IsCodeBinary(index, i))
+                    continue;
+
+                // Get the file header
+                var fileHeader = exeFsHeader.FileHeaders[i];
+                if (fileHeader is null)
+                    continue;
+
+                // Create the ExeFS AES ciphers for this partition
+                uint ctroffset = (fileHeader.FileOffset + cart.MediaUnitSize) / 0x10;
+                byte[] exefsIVWithOffsetForHeader = cart.ExeFSIV(index).Add(ctroffset);
+                var firstCipher = AESCTR.CreateDecryptionCipher(_keysMap[index].NormalKey, exefsIVWithOffsetForHeader);
+                var secondCipher = AESCTR.CreateEncryptionCipher(_keysMap[index].NormalKey2C, exefsIVWithOffsetForHeader);
+
+                // Seek to the file entry
+                reader.Seek(exeFsFilesOffset + fileHeader.FileOffset, SeekOrigin.Begin);
+                writer.Seek(exeFsFilesOffset + fileHeader.FileOffset, SeekOrigin.Begin);
+
+                // Setup and perform the encryption
+                AESCTR.PerformOperation(fileHeader.FileSize,
+                    firstCipher,
+                    secondCipher,
+                    reader,
+                    writer,
+                    s => Console.WriteLine($"\rPartition {index} ExeFS: Decrypting - {fileHeader.FileName}...{s}"));
+            }
+        }
+
+        /// <summary>
+        /// Decrypt the RomFS, if it exists
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private bool DecryptRomFS(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            // Validate the RomFS
+            uint romFsOffset = cart.GetRomFSOffset(index);
+            if (romFsOffset == 0 || romFsOffset > reader.Length)
+            {
+                Console.WriteLine($"Partition {index} RomFS: No Data... Skipping...");
+                return false;
+            }
+
+            uint romFsSize = cart.GetRomFSSize(index);
+            if (romFsSize == 0)
+            {
+                Console.WriteLine($"Partition {index} RomFS: No Data... Skipping...");
+                return false;
+            }
+
+            // Seek to the RomFS
+            reader.Seek(romFsOffset, SeekOrigin.Begin);
+            writer.Seek(romFsOffset, SeekOrigin.Begin);
+
+            // Create the RomFS AES cipher for this partition
+            var cipher = AESCTR.CreateDecryptionCipher(_keysMap[index].NormalKey, cart.RomFSIV(index));
+
+            // Setup and perform the decryption
+            AESCTR.PerformOperation(romFsSize,
+                cipher,
+                reader,
+                writer,
+                s => Console.WriteLine($"\rPartition {index} RomFS: Decrypting - {s}"));
+
+            return true;
+        }
+
+        /// <summary>
+        /// Update the CryptoMethod and BitMasks for the decrypted partition
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="writer">Stream representing the output</param>
+        private static void UpdateDecryptCryptoAndMasks(N3DS cart, int index, Stream writer)
+        {
+            // Get required offsets
+            uint partitionOffset = cart.GetPartitionOffset(index);
+
+            // Seek to the CryptoMethod location
+            writer.Seek(partitionOffset + 0x18B, SeekOrigin.Begin);
+
+            // Write the new CryptoMethod
+            writer.Write((byte)CryptoMethod.Original);
+            writer.Flush();
+
+            // Seek to the BitMasks location
+            writer.Seek(partitionOffset + 0x18F, SeekOrigin.Begin);
+
+            // Write the new BitMasks flag
+            BitMasks flag = cart.GetBitMasks(index);
+            flag &= (BitMasks)((byte)(BitMasks.FixedCryptoKey | BitMasks.NewKeyYGenerator) ^ 0xFF);
+            flag |= BitMasks.NoCrypto;
+            writer.Write((byte)flag);
+            writer.Flush();
+        }
+
+        #endregion
+
+        #region Encrypt
+
+        /// <inheritdoc/>
+        public bool EncryptFile(string input, string? output, bool force)
+        {
+            // Ensure the constants are all set
+            if (_decryptArgs.IsReady != true)
+            {
+                Console.WriteLine("Could not read keys. Please make sure the file exists and try again.");
+                return false;
+            }
+
+            try
+            {
+                // If the output is provided, copy the input file
+                if (output is not null)
+                    File.Copy(input, output, overwrite: true);
+                else
+                    output = input;
+
+                // Open the output file for processing
+                using var reader = File.Open(output, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+                using var writer = File.Open(output, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
+
+                // Deserialize the cart information
+                var cart = N3DS.Create(reader);
+                if (cart?.Model is null)
+                {
+                    Console.WriteLine("Error: Not a 3DS cart image!");
+                    return false;
+                }
+
+                // Encrypt all 8 NCCH partitions
+                EncryptAllPartitions(cart, force, reader, writer);
+                return true;
+            }
+            catch
+            {
+                Console.WriteLine($"An error has occurred. {output} may be corrupted if it was partially processed.");
+                Console.WriteLine("Please check that the file was a valid 3DS or New 3DS cart image and try again.");
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Encrypt all partitions in the partition table of an NCSD header
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="force">Indicates if the operation should be forced</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private void EncryptAllPartitions(N3DS cart, bool force, Stream reader, Stream writer)
+        {
+            // Check the partitions table
+            if (cart.PartitionsTable is null || cart.Partitions is null)
+            {
+                Console.WriteLine("Invalid partitions table!");
+                return;
+            }
+
+            // Iterate over all 8 NCCH partitions
+            for (int p = 0; p < 8; p++)
+            {
+                // Check the partition exists
+                var partition = cart.Partitions[p];
+                if (partition is null || partition.MagicID != NCCHMagicNumber)
+                {
+                    Console.WriteLine($"Partition {p} Not found... Skipping...");
+                    continue;
+                }
+
+                // Check the partition has data
+                var partitionEntry = cart.PartitionsTable[p];
+                if (partitionEntry is null || partitionEntry.Length == 0)
+                {
+                    Console.WriteLine($"Partition {p} No data... Skipping...");
+                    continue;
+                }
+
+                // Encrypt the partition, if possible
+                if (ShouldEncryptPartition(cart, p, force))
+                    EncryptPartition(cart, p, reader, writer);
+            }
+        }
+
+        /// <summary>
+        /// Determine if the current partition should be encrypted
+        /// </summary>
+        private static bool ShouldEncryptPartition(N3DS cart, int index, bool force)
+        {
+            // If we're forcing the operation, tell the user
+            if (force)
+            {
+                Console.WriteLine($"Partition {index} is not verified due to force flag being set.");
+                return true;
+            }
+            // If we're not forcing the operation, check if the 'NoCrypto' bit is set
+            else if (!cart.PossiblyDecrypted(index))
+            {
+                Console.WriteLine($"Partition {index}: Already Encrypted?...");
+                return false;
+            }
+
+            // By default, it passes
+            return true;
+        }
+
+        /// <summary>
+        /// Encrypt a single partition
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private void EncryptPartition(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            // Determine the keys needed for this partition
+            SetEncryptionKeys(cart, index);
+
+            // Encrypt the parts of the partition
+            EncryptExtendedHeader(cart, index, reader, writer);
+            EncryptExeFS(cart, index, reader, writer);
+            EncryptRomFS(cart, index, reader, writer);
+
+            // Update the flags
+            UpdateEncryptCryptoAndMasks(cart, index, writer);
+        }
+
+        /// <summary>
+        /// Determine the set of keys to be used for encryption
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        private void SetEncryptionKeys(N3DS cart, int index)
+        {
+            // Get the partition
+            var partition = cart.Partitions?[index];
+            if (partition is null)
+                return;
+
+            // Get the backup header
+            var backupHeader = cart.BackupHeader;
+            if (backupHeader?.Flags is null)
+                return;
+
+            // Get partition-specific values
+            byte[]? rsaSignature = partition.RSA2048Signature;
+            BitMasks masks = backupHeader.Flags.BitMasks;
+            CryptoMethod method = backupHeader.Flags.CryptoMethod;
+
+            // Get the partition keys
+            _keysMap[index] = new PartitionKeys(_decryptArgs, rsaSignature, masks, method, _development);
+        }
+
+        /// <summary>
+        /// Encrypt the extended header, if it exists
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private bool EncryptExtendedHeader(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            // Get required offsets
+            uint partitionOffset = cart.GetPartitionOffset(index);
+            if (partitionOffset == 0 || partitionOffset > reader.Length)
+            {
+                Console.WriteLine($"Partition {index} No Data... Skipping...");
+                return false;
+            }
+
+            uint extHeaderSize = cart.GetExtendedHeaderSize(index);
+            if (extHeaderSize == 0)
+            {
+                Console.WriteLine($"Partition {index} No Extended Header... Skipping...");
+                return false;
+            }
+
+            // Seek to the extended header
+            reader.Seek(partitionOffset + 0x200, SeekOrigin.Begin);
+            writer.Seek(partitionOffset + 0x200, SeekOrigin.Begin);
+
+            Console.WriteLine($"Partition {index}: Encrypting - ExHeader");
+
+            // Create the Plain AES cipher for this partition
+            var cipher = AESCTR.CreateEncryptionCipher(_keysMap[index].NormalKey2C, cart.PlainIV(index));
+
+            // Process the extended header
+            AESCTR.PerformOperation(Constants.CXTExtendedDataHeaderLength, cipher, reader, writer, null);
+
+#if NET6_0_OR_GREATER
+            // In .NET 6.0, this operation is not picked up by the reader, so we have to force it to reload its buffer
+            reader.Seek(0, SeekOrigin.Begin);
+#endif
+            writer.Flush();
+            return true;
+        }
+
+        /// <summary>
+        /// Encrypt the ExeFS, if it exists
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private bool EncryptExeFS(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            if (cart.ExeFSHeaders is null || index < 0 || index > cart.ExeFSHeaders.Length)
+            {
+                Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
+                return false;
+            }
+
+            // Get the ExeFS header
+            var exefsHeader = cart.ExeFSHeaders[index];
+            if (exefsHeader is null)
+            {
+                Console.WriteLine($"Partition {index} ExeFS header does not exist. Skipping...");
+                return false;
+            }
+
+            // For all but the original crypto method, process each of the files in the table
+            var backupHeader = cart.BackupHeader;
+            if (backupHeader!.Flags!.CryptoMethod != CryptoMethod.Original)
+                EncryptExeFSFileEntries(cart, index, reader, writer);
+
+            // Encrypt the filename table
+            EncryptExeFSFilenameTable(cart, index, reader, writer);
+
+            // Get the ExeFS files offset
+            uint exeFsHeaderOffset = cart.GetExeFSOffset(index);
+            uint exeFsFilesOffset = exeFsHeaderOffset + cart.MediaUnitSize;
+
+            // Seek to the ExeFS
+            reader.Seek(exeFsFilesOffset, SeekOrigin.Begin);
+            writer.Seek(exeFsFilesOffset, SeekOrigin.Begin);
+
+            // Create the ExeFS AES cipher for this partition
+            uint ctroffsetE = cart.MediaUnitSize / 0x10;
+            byte[] exefsIVWithOffset = cart.ExeFSIV(index).Add(ctroffsetE);
+            var cipher = AESCTR.CreateEncryptionCipher(_keysMap[index].NormalKey2C, exefsIVWithOffset);
+
+            // Setup and perform the encryption
+            uint exeFsSize = cart.GetExeFSSize(index) - cart.MediaUnitSize;
+            AESCTR.PerformOperation(exeFsSize,
+                cipher,
+                reader,
+                writer,
+                s => Console.WriteLine($"\rPartition {index} ExeFS: Encrypting - {s}"));
+
+            return true;
+        }
+
+        /// <summary>
+        /// Encrypt the ExeFS Filename Table
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private void EncryptExeFSFilenameTable(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            // Get ExeFS offset
+            uint exeFsOffset = cart.GetExeFSOffset(index);
+            if (exeFsOffset == 0 || exeFsOffset > reader.Length)
+            {
+                Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
+                return;
+            }
+
+            // Seek to the ExeFS header
+            reader.Seek(exeFsOffset, SeekOrigin.Begin);
+            writer.Seek(exeFsOffset, SeekOrigin.Begin);
+
+            Console.WriteLine($"Partition {index} ExeFS: Encrypting - ExeFS Filename Table");
+
+            // Create the ExeFS AES cipher for this partition
+            var cipher = AESCTR.CreateEncryptionCipher(_keysMap[index].NormalKey2C, cart.ExeFSIV(index));
+
+            // Process the filename table
+            byte[] readBytes = reader.ReadBytes((int)cart.MediaUnitSize);
+            byte[] processedBytes = cipher.ProcessBytes(readBytes);
+            writer.Write(processedBytes);
+
+#if NET6_0_OR_GREATER
+            // In .NET 6.0, this operation is not picked up by the reader, so we have to force it to reload its buffer
+            reader.Seek(0, SeekOrigin.Begin);
+#endif
+            writer.Flush();
+        }
+
+        /// <summary>
+        /// Encrypt the ExeFS file entries
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private void EncryptExeFSFileEntries(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            // Get ExeFS offset
+            uint exeFsHeaderOffset = cart.GetExeFSOffset(index);
+            if (exeFsHeaderOffset == 0 || exeFsHeaderOffset > reader.Length)
+            {
+                Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
+                return;
+            }
+
+            // Get to the start of the files
+            uint exeFsFilesOffset = exeFsHeaderOffset + cart.MediaUnitSize;
+
+            // If the header failed to read, log and return
+            var exeFsHeader = cart.ExeFSHeaders?[index];
+            if (exeFsHeader?.FileHeaders is null)
+            {
+                Console.WriteLine($"Partition {index} ExeFS header does not exist. Skipping...");
+                return;
+            }
+
+            // Loop through and process all headers
+            for (int i = 0; i < exeFsHeader.FileHeaders.Length; i++)
+            {
+                // Only attempt to process code binary files
+                if (!cart.IsCodeBinary(index, i))
+                    continue;
+
+                // Get the file header
+                var fileHeader = exeFsHeader.FileHeaders[i];
+                if (fileHeader is null)
+                    continue;
+
+                // Create the ExeFS AES ciphers for this partition
+                uint ctroffset = (fileHeader.FileOffset + cart.MediaUnitSize) / 0x10;
+                byte[] exefsIVWithOffsetForHeader = cart.ExeFSIV(index).Add(ctroffset);
+                var firstCipher = AESCTR.CreateEncryptionCipher(_keysMap[index].NormalKey, exefsIVWithOffsetForHeader);
+                var secondCipher = AESCTR.CreateDecryptionCipher(_keysMap[index].NormalKey2C, exefsIVWithOffsetForHeader);
+
+                // Seek to the file entry
+                reader.Seek(exeFsFilesOffset + fileHeader.FileOffset, SeekOrigin.Begin);
+                writer.Seek(exeFsFilesOffset + fileHeader.FileOffset, SeekOrigin.Begin);
+
+                // Setup and perform the encryption
+                AESCTR.PerformOperation(fileHeader.FileSize,
+                    firstCipher,
+                    secondCipher,
+                    reader,
+                    writer,
+                    s => Console.WriteLine($"\rPartition {index} ExeFS: Encrypting - {fileHeader.FileName}...{s}"));
+            }
+        }
+
+        /// <summary>
+        /// Encrypt the RomFS, if it exists
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="reader">Stream representing the input</param>
+        /// <param name="writer">Stream representing the output</param>
+        private bool EncryptRomFS(N3DS cart, int index, Stream reader, Stream writer)
+        {
+            // Validate the RomFS
+            uint romFsOffset = cart.GetRomFSOffset(index);
+            if (romFsOffset == 0 || romFsOffset > reader.Length)
+            {
+                Console.WriteLine($"Partition {index} RomFS: No Data... Skipping...");
+                return false;
+            }
+
+            uint romFsSize = cart.GetRomFSSize(index);
+            if (romFsSize == 0)
+            {
+                Console.WriteLine($"Partition {index} RomFS: No Data... Skipping...");
+                return false;
+            }
+
+            // Seek to the RomFS
+            reader.Seek(romFsOffset, SeekOrigin.Begin);
+            writer.Seek(romFsOffset, SeekOrigin.Begin);
+
+            // Force setting encryption keys for partitions 1 and above
+            if (index > 0)
+            {
+                var backupHeader = cart.BackupHeader;
+                _keysMap[index].SetRomFSValues(backupHeader!.Flags!.BitMasks);
+            }
+
+            // Create the RomFS AES cipher for this partition
+            var cipher = AESCTR.CreateEncryptionCipher(_keysMap[index].NormalKey, cart.RomFSIV(index));
+
+            // Setup and perform the decryption
+            AESCTR.PerformOperation(romFsSize,
+                cipher,
+                reader,
+                writer,
+                s => Console.WriteLine($"\rPartition {index} RomFS: Encrypting - {s}"));
+
+            return true;
+        }
+
+        /// <summary>
+        /// Update the CryptoMethod and BitMasks for the encrypted partition
+        /// </summary>
+        /// <param name="cart">Cart representing the 3DS file</param>
+        /// <param name="index">Index of the partition</param>
+        /// <param name="writer">Stream representing the output</param>
+        private static void UpdateEncryptCryptoAndMasks(N3DS cart, int index, Stream writer)
+        {
+            // Get required offsets
+            uint partitionOffset = cart.GetPartitionOffset(index);
+
+            // Get the backup header
+            var backupHeader = cart.BackupHeader;
+            if (backupHeader?.Flags is null)
+                return;
+
+            // Seek to the CryptoMethod location
+            writer.Seek(partitionOffset + 0x18B, SeekOrigin.Begin);
+
+            // Write the new CryptoMethod
+            // - For partitions 1 and up, set crypto-method to 0x00
+            // - If partition 0, restore crypto-method from backup flags
+            byte cryptoMethod = index > 0 ? (byte)CryptoMethod.Original : (byte)backupHeader.Flags.CryptoMethod;
+            writer.Write(cryptoMethod);
+            writer.Flush();
+
+            // Seek to the BitMasks location
+            writer.Seek(partitionOffset + 0x18F, SeekOrigin.Begin);
+
+            // Write the new BitMasks flag
+            BitMasks flag = cart.GetBitMasks(index);
+            flag &= (BitMasks.FixedCryptoKey | BitMasks.NewKeyYGenerator | BitMasks.NoCrypto) ^ (BitMasks)0xFF;
+            flag |= (BitMasks.FixedCryptoKey | BitMasks.NewKeyYGenerator) & backupHeader.Flags.BitMasks;
+            writer.Write((byte)flag);
+            writer.Flush();
+        }
+
+        #endregion
+
+        #region Info
+
+        /// <inheritdoc/>
+        public string? GetInformation(string filename)
+        {
+            try
+            {
+                // Open the file for reading
+                using var input = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+
+                // Deserialize the cart information
+                var cart = N3DS.Create(input);
+                if (cart?.Model is null)
+                    return "Error: Not a 3DS cart image!";
+
+                // Get a string builder for the status
+                var sb = new StringBuilder();
+
+                // Iterate over all 8 NCCH partitions
+                for (int p = 0; p < 8; p++)
+                {
+                    bool decrypted = cart.PossiblyDecrypted(p);
+                    sb.AppendLine($"\tPartition {p}: {(decrypted ? "Decrypted" : "Encrypted")}");
+                }
+
+                // Return the status for all partitions
+                return sb.ToString();
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex);
+                return null;
+            }
+        }
+
+        #endregion
+    }
+}

NDecrypt.sln

@@ -0,0 +1,36 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.3.32922.545
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{31CE0445-F693-4C9A-B6CD-499C38CFF7FE}"
+	ProjectSection(SolutionItems) = preProject
+		README.md = README.md
+	EndProjectSection
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NDecrypt", "NDecrypt\NDecrypt.csproj", "{05566793-831F-4AE1-A6D2-F9214F36618E}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NDecrypt.Core", "NDecrypt.Core\NDecrypt.Core.csproj", "{91C54370-5741-4742-B2E9-EC498551AD1C}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{05566793-831F-4AE1-A6D2-F9214F36618E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{05566793-831F-4AE1-A6D2-F9214F36618E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{05566793-831F-4AE1-A6D2-F9214F36618E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{05566793-831F-4AE1-A6D2-F9214F36618E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{91C54370-5741-4742-B2E9-EC498551AD1C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{91C54370-5741-4742-B2E9-EC498551AD1C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{91C54370-5741-4742-B2E9-EC498551AD1C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{91C54370-5741-4742-B2E9-EC498551AD1C}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {5AB50D9B-BA18-4F96-804B-52E7E0845B37}
+	EndGlobalSection
+EndGlobal

NDecrypt/Enumerations.cs

@@ -0,0 +1,15 @@
+namespace NDecrypt
+{
+    /// <summary>
+    /// Type of the detected file
+    /// </summary>
+    internal enum FileType
+    {
+        NULL,
+        NDS,
+        NDSi,
+        iQueDS,
+        N3DS,
+        iQue3DS,
+    }
+}

NDecrypt/Features/BaseFeature.cs

@@ -0,0 +1,198 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using NDecrypt.Core;
+using SabreTools.CommandLine;
+using SabreTools.CommandLine.Inputs;
+
+namespace NDecrypt.Features
+{
+    internal abstract class BaseFeature : Feature
+    {
+        #region Common Inputs
+
+        protected const string ConfigName = "config";
+        protected readonly StringInput ConfigString = new(ConfigName, ["-c", "--config"], "Path to config.json");
+
+        protected const string DevelopmentName = "development";
+        protected readonly FlagInput DevelopmentFlag = new(DevelopmentName, ["-d", "--development"], "Enable using development keys, if available");
+
+        protected const string ForceName = "force";
+        protected readonly FlagInput ForceFlag = new(ForceName, ["-f", "--force"], "Force operation by avoiding sanity checks");
+
+        protected const string HashName = "hash";
+        protected readonly FlagInput HashFlag = new(HashName, "--hash", "Output size and hashes to a companion file");
+
+        protected const string OverwriteName = "overwrite";
+        protected readonly FlagInput OverwriteFlag = new(OverwriteName, ["-o", "--overwrite"], "Overwrite input files instead of creating new ones");
+
+        #endregion
+
+        /// <summary>
+        /// Mapping of reusable tools
+        /// </summary>
+        private readonly Dictionary<FileType, ITool> _tools = [];
+
+        protected BaseFeature(string name, string[] flags, string description, string? detailed = null)
+            : base(name, flags, description, detailed)
+        {
+        }
+
+        /// <inheritdoc/>
+        public override bool Execute()
+        {
+            // Initialize required pieces
+            InitializeTools();
+
+            for (int i = 0; i < Inputs.Count; i++)
+            {
+                if (File.Exists(Inputs[i]))
+                {
+                    ProcessFile(Inputs[i]);
+                }
+                else if (Directory.Exists(Inputs[i]))
+                {
+                    foreach (string file in Directory.GetFiles(Inputs[i], "*", SearchOption.AllDirectories))
+                    {
+                        ProcessFile(file);
+                    }
+                }
+                else
+                {
+                    Console.WriteLine($"{Inputs[i]} is not a file or folder. Please check your spelling and formatting and try again.");
+                }
+            }
+
+            return true;
+        }
+
+        /// <inheritdoc/>
+        public override bool VerifyInputs() => Inputs.Count > 0;
+
+        /// <summary>
+        /// Process a single file path
+        /// </summary>
+        /// <param name="input">File path to process</param>
+        protected abstract void ProcessFile(string input);
+
+        /// <summary>
+        /// Initialize the tools to be used by the feature
+        /// </summary>
+        private void InitializeTools()
+        {
+
+            var decryptArgs = new DecryptArgs(GetString(ConfigName, "config.json"));
+            _tools[FileType.NDS] = new DSTool(decryptArgs);
+            _tools[FileType.N3DS] = new ThreeDSTool(GetBoolean(DevelopmentName), decryptArgs);
+        }
+
+        /// <summary>
+        /// Derive the encryption tool to be used for the given file
+        /// </summary>
+        /// <param name="filename">Filename to derive the tool from</param>
+        protected ITool? DeriveTool(string filename)
+        {
+            if (!File.Exists(filename))
+            {
+                Console.WriteLine($"{filename} does not exist! Skipping...");
+                return null;
+            }
+
+            FileType type = DetermineFileType(filename);
+            return type switch
+            {
+                FileType.NDS => _tools[FileType.NDS],
+                FileType.NDSi => _tools[FileType.NDS],
+                FileType.iQueDS => _tools[FileType.NDS],
+                FileType.N3DS => _tools[FileType.N3DS],
+                _ => null,
+            };
+        }
+
+        /// <summary>
+        /// Derive an output filename from the input, if possible
+        /// </summary>
+        /// <param name="filename">Name of the input file to derive from</param>
+        /// <param name="extension">Preferred extension set by the feature implementation</param>
+        /// <returns>Output filename based on the input</returns>
+        protected static string GetOutputFile(string filename, string extension)
+        {
+            // Empty filenames are passed back
+            if (filename.Length == 0)
+                return filename;
+
+            // TODO: Replace the suffix instead of just appending
+            // TODO: Ensure that the input and output aren't the same
+
+            // If the extension does not include a leading period
+#if NETCOREAPP || NETSTANDARD2_0_OR_GREATER
+            if (!extension.StartsWith('.'))
+#else
+            if (!extension.StartsWith("."))
+#endif
+                extension = $".{extension}";
+
+            // Append the extension and return
+            return $"{filename}{extension}";
+        }
+
+        /// <summary>
+        /// Write out the hashes of a file to a named file
+        /// </summary>
+        /// <param name="filename">Filename to get hashes for/param>
+        protected static void WriteHashes(string filename)
+        {
+            // If the file doesn't exist, don't try anything
+            if (!File.Exists(filename))
+                return;
+
+            // Get the hash string from the file
+            string? hashString = HashingHelper.GetInfo(filename);
+            if (hashString is null)
+                return;
+
+            // Open the output file and write the hashes
+            using var fs = File.Open(Path.GetFullPath(filename) + ".hash", FileMode.Create, FileAccess.Write, FileShare.None);
+            using var sw = new StreamWriter(fs);
+            sw.Write(hashString);
+        }
+
+        /// <summary>
+        /// Determine the file type from the filename extension
+        /// </summary>
+        /// <param name="filename">Filename to derive the type from</param>
+        /// <returns>FileType value, if possible</returns>
+        private static FileType DetermineFileType(string filename)
+        {
+            if (filename.EndsWith(".nds", StringComparison.OrdinalIgnoreCase)        // Standard carts
+                || filename.EndsWith(".nds.dec", StringComparison.OrdinalIgnoreCase) // Carts/images with secure area decrypted
+                || filename.EndsWith(".nds.enc", StringComparison.OrdinalIgnoreCase) // Carts/images with secure area encrypted
+                || filename.EndsWith(".srl", StringComparison.OrdinalIgnoreCase))    // Development carts/images
+            {
+                Console.WriteLine("File recognized as Nintendo DS");
+                return FileType.NDS;
+            }
+            else if (filename.EndsWith(".dsi", StringComparison.OrdinalIgnoreCase))
+            {
+                Console.WriteLine("File recognized as Nintendo DSi");
+                return FileType.NDSi;
+            }
+            else if (filename.EndsWith(".ids", StringComparison.OrdinalIgnoreCase))
+            {
+                Console.WriteLine("File recognized as iQue DS");
+                return FileType.iQueDS;
+            }
+            else if (filename.EndsWith(".3ds", StringComparison.OrdinalIgnoreCase)    // Standard carts
+                || filename.EndsWith(".3ds.dec", StringComparison.OrdinalIgnoreCase)  // Decrypted carts/images
+                || filename.EndsWith(".3ds.enc", StringComparison.OrdinalIgnoreCase)  // Encrypted carts/images
+                || filename.EndsWith(".cci", StringComparison.OrdinalIgnoreCase))     // Development carts/images
+            {
+                Console.WriteLine("File recognized as Nintendo 3DS");
+                return FileType.N3DS;
+            }
+
+            Console.WriteLine($"Unrecognized file format for {filename}. Expected *.nds, *.srl, *.dsi, *.3ds, *.cci");
+            return FileType.NULL;
+        }
+    }
+}

NDecrypt/Features/DecryptFeature.cs

@@ -0,0 +1,57 @@
+using System;
+
+namespace NDecrypt.Features
+{
+    internal sealed class DecryptFeature : BaseFeature
+    {
+        #region Feature Definition
+
+        public const string DisplayName = "decrypt";
+
+        private static readonly string[] _flags = ["d", "decrypt"];
+
+        private const string _description = "Decrypt the input files";
+
+        #endregion
+
+        public DecryptFeature()
+            : base(DisplayName, _flags, _description)
+        {
+            RequiresInputs = true;
+
+            Add(ConfigString);
+            Add(DevelopmentFlag);
+            Add(ForceFlag);
+            Add(HashFlag);
+
+            // TODO: Include this when enabled
+            // Add(OverwriteFlag);
+        }
+
+        /// <inheritdoc/>
+        protected override void ProcessFile(string input)
+        {
+            // Attempt to derive the tool for the path
+            var tool = DeriveTool(input);
+            if (tool is null)
+                return;
+
+            // Derive the output filename, if required
+            string? output = null;
+            if (!GetBoolean(OverwriteName))
+                output = GetOutputFile(input, ".dec");
+
+            Console.WriteLine($"Processing {input}");
+
+            if (!tool.DecryptFile(input, output, GetBoolean(ForceName)))
+            {
+                Console.WriteLine("Decryption failed!");
+                return;
+            }
+
+            // Output the file hashes, if expected
+            if (GetBoolean(HashName))
+                WriteHashes(input);
+        }
+    }
+}

NDecrypt/Features/EncryptFeature.cs

@@ -0,0 +1,57 @@
+using System;
+
+namespace NDecrypt.Features
+{
+    internal sealed class EncryptFeature : BaseFeature
+    {
+        #region Feature Definition
+
+        public const string DisplayName = "encrypt";
+
+        private static readonly string[] _flags = ["e", "encrypt"];
+
+        private const string _description = "Encrypt the input files";
+
+        #endregion
+
+        public EncryptFeature()
+            : base(DisplayName, _flags, _description)
+        {
+            RequiresInputs = true;
+
+            Add(ConfigString);
+            Add(DevelopmentFlag);
+            Add(ForceFlag);
+            Add(HashFlag);
+
+            // TODO: Include this when enabled
+            // Add(OverwriteFlag);
+        }
+
+        /// <inheritdoc/>
+        protected override void ProcessFile(string input)
+        {
+            // Attempt to derive the tool for the path
+            var tool = DeriveTool(input);
+            if (tool is null)
+                return;
+
+            // Derive the output filename, if required
+            string? output = null;
+            if (!GetBoolean(OverwriteName))
+                output = GetOutputFile(input, ".enc");
+
+            Console.WriteLine($"Processing {input}");
+
+            if (!tool.EncryptFile(input, output, GetBoolean(ForceName)))
+            {
+                Console.WriteLine("Encryption failed!");
+                return;
+            }
+
+            // Output the file hashes, if expected
+            if (GetBoolean(HashName))
+                WriteHashes(input);
+        }
+    }
+}

NDecrypt/Features/InfoFeature.cs

@@ -0,0 +1,45 @@
+using System;
+
+namespace NDecrypt.Features
+{
+    internal sealed class InfoFeature : BaseFeature
+    {
+        #region Feature Definition
+
+        public const string DisplayName = "info";
+
+        private static readonly string[] _flags = ["i", "info"];
+
+        private const string _description = "Output file information";
+
+        #endregion
+
+        public InfoFeature()
+            : base(DisplayName, _flags, _description)
+        {
+            RequiresInputs = true;
+
+            Add(HashFlag);
+        }
+
+        /// <inheritdoc/>
+        protected override void ProcessFile(string input)
+        {
+            // Attempt to derive the tool for the path
+            var tool = DeriveTool(input);
+            if (tool is null)
+                return;
+
+            Console.WriteLine($"Processing {input}");
+
+            string? infoString = tool.GetInformation(input);
+            infoString ??= "There was a problem getting file information!";
+
+            Console.WriteLine(infoString);
+
+            // Output the file hashes, if expected
+            if (GetBoolean(HashName))
+                WriteHashes(input);
+        }
+    }
+}

NDecrypt/HashingHelper.cs

@@ -0,0 +1,33 @@
+using System.IO;
+using SabreTools.Hashing;
+
+namespace NDecrypt
+{
+    internal static class HashingHelper
+    {
+        /// <summary>
+        /// Retrieve file information for a single file
+        /// </summary>
+        /// <param name="input">Filename to get information from</param>
+        /// <returns>Formatted string representing the hashes, null on error</returns>
+        public static string? GetInfo(string input)
+        {
+            // If the file doesn't exist, return null
+            if (!File.Exists(input))
+                return null;
+
+            // Get the file information, if possible
+            HashType[] hashTypes = [HashType.CRC32, HashType.MD5, HashType.SHA1, HashType.SHA256];
+            var hashDict = HashTool.GetFileHashesAndSize(input, hashTypes, out long size);
+            if (hashDict is null)
+                return null;
+
+            // Get the results
+            return $"Size: {size}\n"
+                + $"CRC-32: {(hashDict.TryGetValue(HashType.CRC32, out string? value) ? value : string.Empty)}\n"
+                + $"MD5: {(hashDict.TryGetValue(HashType.MD5, out string? value1) ? value1 : string.Empty)}\n"
+                + $"SHA-1: {(hashDict.TryGetValue(HashType.SHA1, out string? value2) ? value2 : string.Empty)}\n"
+                + $"SHA-256: {(hashDict.TryGetValue(HashType.SHA256, out string? value3) ? value3 : string.Empty)}\n";
+        }
+    }
+}

NDecrypt/NDecrypt.csproj

@@ -0,0 +1,50 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <!-- Assembly Properties -->
+        <TargetFrameworks>net20;net35;net40;net452;net462;net472;net48;netcoreapp3.1;net5.0;net6.0;net7.0;net8.0;net9.0;net10.0</TargetFrameworks>
+        <OutputType>Exe</OutputType>
+        <CheckEolTargetFramework>false</CheckEolTargetFramework>
+        <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
+        <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
+        <LangVersion>latest</LangVersion>
+        <Nullable>enable</Nullable>
+        <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
+        <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+        <VersionPrefix>0.5.0</VersionPrefix>
+
+        <!-- Package Properties -->
+        <Title>NDecrypt</Title>
+        <Authors>Matt Nadareski</Authors>
+        <Description>DS/3DS Encryption Tool</Description>
+        <Copyright>Copyright (c) Matt Nadareski 2018-2025</Copyright>
+        <PackageLicenseExpression>MIT</PackageLicenseExpression>
+        <PackageProjectUrl>https://github.com/SabreTools/</PackageProjectUrl>
+        <RepositoryUrl>https://github.com/SabreTools/NDecrypt</RepositoryUrl>
+        <RepositoryType>git</RepositoryType>
+    </PropertyGroup>
+
+    <!-- Support All Frameworks -->
+    <PropertyGroup Condition="$(TargetFramework.StartsWith(`net2`)) OR $(TargetFramework.StartsWith(`net3`)) OR $(TargetFramework.StartsWith(`net4`))">
+        <RuntimeIdentifiers>win-x86;win-x64</RuntimeIdentifiers>
+    </PropertyGroup>
+    <PropertyGroup Condition="$(TargetFramework.StartsWith(`netcoreapp`)) OR $(TargetFramework.StartsWith(`net5`))">
+        <RuntimeIdentifiers>win-x86;win-x64;win-arm64;linux-x64;linux-arm64;osx-x64</RuntimeIdentifiers>
+    </PropertyGroup>
+    <PropertyGroup Condition="$(TargetFramework.StartsWith(`net6`)) OR $(TargetFramework.StartsWith(`net7`)) OR $(TargetFramework.StartsWith(`net8`)) OR $(TargetFramework.StartsWith(`net9`)) OR $(TargetFramework.StartsWith(`net10`))">
+        <RuntimeIdentifiers>win-x86;win-x64;win-arm64;linux-x64;linux-arm64;osx-x64;osx-arm64</RuntimeIdentifiers>
+    </PropertyGroup>
+    <PropertyGroup Condition="$(RuntimeIdentifier.StartsWith(`osx-arm`))">
+        <TargetFrameworks>net6.0;net7.0;net8.0;net9.0;net10.0</TargetFrameworks>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\NDecrypt.Core\NDecrypt.Core.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
+        <PackageReference Include="SabreTools.CommandLine" Version="[1.4.0]" />
+    </ItemGroup>
+
+</Project>

NDecrypt/Program.cs

@@ -0,0 +1,89 @@
+using System;
+using System.Collections.Generic;
+using NDecrypt.Features;
+using SabreTools.CommandLine;
+using SabreTools.CommandLine.Features;
+
+namespace NDecrypt
+{
+    class Program
+    {
+        public static void Main(string[] args)
+        {
+            // Create the command set
+            var commandSet = CreateCommands();
+
+            // If we have no args, show the help and quit
+            if (args is null || args.Length == 0)
+            {
+                commandSet.OutputAllHelp();
+                return;
+            }
+
+            // Get the first argument as a feature flag
+            string featureName = args[0];
+
+            // Get the associated feature
+            var topLevel = commandSet.GetTopLevel(featureName);
+            if (topLevel is null || topLevel is not Feature feature)
+            {
+                Console.WriteLine($"'{featureName}' is not valid feature flag");
+                commandSet.OutputFeatureHelp(featureName);
+                return;
+            }
+
+            // Handle default help functionality
+            if (topLevel is Help helpFeature)
+            {
+                helpFeature.ProcessArgs(args, 0, commandSet);
+                return;
+            }
+
+            // Now verify that all other flags are valid
+            if (!feature.ProcessArgs(args, 1))
+                return;
+
+            // If inputs are required
+            if (feature.RequiresInputs && !feature.VerifyInputs())
+            {
+                commandSet.OutputFeatureHelp(topLevel.Name);
+                Environment.Exit(0);
+            }
+
+            // Now execute the current feature
+            if (!feature.Execute())
+            {
+                Console.Error.WriteLine("An error occurred during processing!");
+                commandSet.OutputFeatureHelp(topLevel.Name);
+            }
+        }
+
+        /// <summary>
+        /// Create the command set for the program
+        /// </summary>
+        private static CommandSet CreateCommands()
+        {
+            List<string> header = [
+                "Cart Image Encrypt/Decrypt Tool",
+                string.Empty,
+                "NDecrypt <operation> [options] <path> ...",
+                string.Empty,
+            ];
+
+            List<string> footer = [
+                string.Empty,
+                "<path> can be any file or folder that contains uncompressed items.",
+                "More than one path can be specified at a time.",
+            ];
+
+            var commandSet = new CommandSet(header, footer);
+
+            commandSet.Add(new Help());
+            commandSet.Add(new EncryptFeature());
+            commandSet.Add(new DecryptFeature());
+            commandSet.Add(new InfoFeature());
+
+            return commandSet;
+        }
+    }
+}

README.md

@@ -0,0 +1,108 @@
+# NDecrypt
+
+[![Build and Test](https://github.com/SabreTools/NDecrypt/actions/workflows/build_and_test.yml/badge.svg)](https://github.com/SabreTools/NDecrypt/actions/workflows/build_and_test.yml)
+
+A simple tool for simple people.
+
+## What is this?
+
+This is a code port of 3 different programs:
+
+- `3ds_encrypt.py`
+- `3ds_decrypt.py`
+- `woodsec` (part of [wooddumper](https://github.com/TuxSH/wooddumper))
+
+## No really, what is this?
+
+This tool allows you to encrypt and decrypt your personally dumped Nintendo DS, 3DS, and New 3DS cart images with minimal hassle.
+
+## Where do I find it?
+
+For the most recent stable build, download the latest release here: [Releases Page](https://github.com/SabreTools/NDecrypt/releases)
+
+For the latest WIP build here: [Rolling Release](https://github.com/SabreTools/NDecrypt/releases/tag/rolling)
+
+## So how do I use this?
+
+    Usage: NDecrypt <operation> [flags] <path> ...
+
+    Possible values for <operation>:
+    e, encrypt - Encrypt the input files
+    d, decrypt - Decrypt the input files
+    i, info    - Output file information
+
+    Possible values for [flags] (one or more can be used):
+    -?, -h, --help           Display this help text and quit
+    -c, --config <path>      Path to config.json
+    -d, --development        Enable using development keys, if available
+    -f, --force              Force operation by avoiding sanity checks
+    --hash                   Output size and hashes to a companion file
+
+    <path> can be any file or folder that contains uncompressed items.
+    More than one path can be specified at a time.
+
+### Additional Notes
+
+- Input files are overwritten, even if they are only partially processed. You should make backups of the files you're working on if you're worried about this.
+- Mixed folders or inputs are also accepted, you can decrypt or encrypt multiple files, regardless of their type. This being said, you can only do encrypt _OR_ decrypt at one time.
+- Required files will automatically be searched for in the application runtime directory as well as `%HOME%/.config/ndecrypt`, also known as `%USERPROFILE%\.config\ndecrypt` on Windows.
+
+## I feel like something is missing
+
+There is a major file that you can use to give NDecrypt that extra _oomph_ of functionality that it really needs. That is, you can't do any encryption or decryption without it present. I can't give you the files and I can't generate them for you on the fly with the correct values. Keys are a thorny thing and I just do not want to deal with them. Values are validated, at least, but you'll only get yelled at on run if one of them is wrong. Don't worry, they're just disabled, not removed.
+
+This convenient table gives an overview of mappings between the current `config.json` type along with the 2 formerly-supported types and a completely unsupported but common type.
+
+| `config.json` | `keys.bin` order | `aes_keys.txt` | rom-properties `keys.conf` |
+| --- | --- | --- | --- |
+| `NitroEncryptionData` | **N/A** | **UNMAPPED** | **UNMAPPED** |
+| `AESHardwareConstant` | 1 | `generator` | `ctr-scrambler` |
+| `KeyX0x18` | 2 | `slot0x18KeyX` | `ctr-Slot0x18KeyX` |
+| `KeyX0x1B` | 3 | `slot0x1BKeyX` | `ctr-Slot0x1BKeyX` |
+| `KeyX0x25` | 4 | `slot0x25KeyX` | `ctr-Slot0x25KeyX` |
+| `KeyX0x2C` | 5 | `slot0x2CKeyX` | `ctr-Slot0x2CKeyX` |
+| `DevKeyX0x18` | 6 | **UNMAPPED** | `ctr-dev-Slot0x18KeyX` |
+| `DevKeyX0x1B` | 7 | **UNMAPPED** | `ctr-dev-Slot0x1BKeyX` |
+| `DevKeyX0x25` | 8 | **UNMAPPED** | `ctr-dev-Slot0x25KeyX` |
+| `DevKeyX0x2C` | 9 | **UNMAPPED** | `ctr-dev-Slot0x2CKeyX` |
+
+**Note:** `Dev*` keys are not required for the vast majority of normal operations. They're only used if the `-d` option is included. Working with your own retail carts will pretty much never require these, so don't drive yourself silly dealing with them.
+
+**Note:** The `NitroEncryptionData` field is also known as the "Blowfish table" for Nintendo DS carts. It's stored in the same hex string format as the other keys. There's some complicated stuff about how it's used and where it's stored, but all you need to know is that it is required.
+
+**Community Note:** If you have used previous versions of NDecrypt and already have either `keys.bin` or `aes_keys.txt`, consider using [this helpful community-made script](https://gist.github.com/Dimensional/82f212a0b35bcf9caaa2bc9a70b3a92a) to make your life a bit easier. It will convert them into the new `config.json` format that will be supported from here on out.
+
+### `config.json`
+
+The up-and-coming, shiny, new, exciting, JSON-based format for storing the encryption keys that you need for Nintendo DS, 3DS, and New 3DS. This JSON file is not generated by anything, but maps pretty much one-to-one with the code inside of NDecrypt, making it super convenient to use. Keys provided need to be hex strings (e.g. `"AABBCCDD"`). Any keys that are left with `null` or `""` as the value will be ignored. See [the sample config](https://github.com/SabreTools/NDecrypt/blob/master/config-default.json) that I've nicely generated for you. You're welcome.
+
+In the future, this file will be automatically generated on first run along with some cutesy little message telling you to fill it out when you get a chance. It's not doing it right now because I don't want to confuse users. Including those reading this. How meta.
+
+### `keys.bin` (Deprecated)
+
+This is the OG of NDecrypt key file formats. It's a weird, binary blob of a format that is composed of little-endian values (most common extraction methods produce big endian, so keep that in mind). It's only compatible wtih Nintendo 3DS and New 3DS keys and is incredibly inflexible in its layout. The little-endianness of it is a relic of how keys were handled in-code previously and I really can't fix it now. If you don't have a key, it needs to be filled with `0x00` bytes so it doesn't mess up the read. Yeah.
+
+Oddly, this gets confused with some similar format that GodMode9 works with, but it has nothing to do with it. If you try to use one of those files in place of this one, something will probably break. It wasn't intentional, I just didn't look ahead of time. See the table in the main part of this section for the order the keys need to be stored in.
+
+### `aes_keys.txt` (Deprecated)
+
+This is an INI-based format that was super popular among 3DS emulators and probably still is. Weird thing, I know, but just roll with it please.
+
+## But does it work?
+
+As much as I'd like to think that this program is entirely without flaws, numbers need to speak for themselves sometimes. Here's a list of the supported sets and their current compatibility percentages with woodsec and the Python scripts (as of 2020-12-19):
+
+- **Nintendo DS** -  >99% compatible (Both encryption and decryption)
+- **Nintendo DSi** - 100% compatible (Both encryption and decryption)
+- **Nintendo 3DS** - 100% compatible (Both encryption and decryption)
+- **Nintendo New 3DS** - 100% compatible (Both encryption and decryption)
+
+Please note the above numbers are based on the current, documented values. The notable exceptions to this tend to be unlicensed carts which may be dumped incorrectly or have odd information stored in their secure area.
+
+## Anything else?
+
+I'd like to thank the developers of the original programs for doing the actual hard work to figure things out. I'd also like to thank everyone who helped to test this against the original programs and made code suggestions.
+
+## Disclaimer
+
+This program is **ONLY** for use with personally dumped files and keys and is not meant for enabling illegal activity. I do not condone using this program for anything other than personal use and research. If this program is used for anything other than that, I cannot be held liable for anything that happens.

config-default.json

@@ -0,0 +1,12 @@
+{
+    "NitroEncryptionData": null,
+    "AESHardwareConstant": null,
+    "KeyX0x18": null,
+    "KeyX0x1B": null,
+    "KeyX0x25": null,
+    "KeyX0x2C": null,
+    "DevKeyX0x18": null,
+    "DevKeyX0x1B": null,
+    "DevKeyX0x25": null,
+    "DevKeyX0x2C": null
+}

publish-nix.sh

@@ -0,0 +1,151 @@
+#!/bin/bash
+
+# This batch file assumes the following:
+# - .NET 9.0 (or newer) SDK is installed and in PATH
+# - zip is installed and in PATH
+# - Git is installed and in PATH
+#
+# If any of these are not satisfied, the operation may fail
+# in an unpredictable way and result in an incomplete output.
+
+# Optional parameters
+USE_ALL=false
+INCLUDE_DEBUG=false
+NO_BUILD=false
+NO_ARCHIVE=false
+while getopts "udba" OPTION; do
+    case $OPTION in
+    u)
+        USE_ALL=true
+        ;;
+    d)
+        INCLUDE_DEBUG=true
+        ;;
+    b)
+        NO_BUILD=true
+        ;;
+    a)
+        NO_ARCHIVE=true
+        ;;
+    *)
+        echo "Invalid option provided"
+        exit 1
+        ;;
+    esac
+done
+
+# Set the current directory as a variable
+BUILD_FOLDER=$PWD
+
+# Set the current commit hash
+COMMIT=$(git log --pretty=%H -1)
+
+# Output the selected options
+echo "Selected Options:"
+echo "  Use all frameworks (-u)               $USE_ALL"
+echo "  Include debug builds (-d)             $INCLUDE_DEBUG"
+echo "  No build (-b)                         $NO_BUILD"
+echo "  No archive (-a)                       $NO_ARCHIVE"
+echo " "
+
+# Create the build matrix arrays
+FRAMEWORKS=("net10.0")
+RUNTIMES=("win-x86" "win-x64" "win-arm64" "linux-x64" "linux-arm64" "osx-x64" "osx-arm64")
+
+# Use expanded lists, if requested
+if [ $USE_ALL = true ]; then
+    FRAMEWORKS=("net20" "net35" "net40" "net452" "net462" "net472" "net48" "netcoreapp3.1" "net5.0" "net6.0" "net7.0" "net8.0" "net9.0" "net10.0")
+fi
+
+# Create the filter arrays
+SINGLE_FILE_CAPABLE=("net5.0" "net6.0" "net7.0" "net8.0" "net9.0" "net10.0")
+VALID_APPLE_FRAMEWORKS=("net6.0" "net7.0" "net8.0" "net9.0" "net10.0")
+VALID_CROSS_PLATFORM_FRAMEWORKS=("netcoreapp3.1" "net5.0" "net6.0" "net7.0" "net8.0" "net9.0" "net10.0")
+VALID_CROSS_PLATFORM_RUNTIMES=("win-arm64" "linux-x64" "linux-arm64" "osx-x64" "osx-arm64")
+
+# Only build if requested
+if [ $NO_BUILD = false ]; then
+    # Restore Nuget packages for all builds
+    echo "Restoring Nuget packages"
+    dotnet restore
+
+    # Create Nuget Packages
+    dotnet pack NDecrypt.Core/NDecrypt.Core.csproj --output $BUILD_FOLDER
+
+    # Build Program
+    for FRAMEWORK in "${FRAMEWORKS[@]}"; do
+        for RUNTIME in "${RUNTIMES[@]}"; do
+            # Output the current build
+            echo "===== Build Program - $FRAMEWORK, $RUNTIME ====="
+
+            # If we have an invalid combination of framework and runtime
+            if [[ ! $(echo ${VALID_CROSS_PLATFORM_FRAMEWORKS[@]} | fgrep -w $FRAMEWORK) ]]; then
+                if [[ $(echo ${VALID_CROSS_PLATFORM_RUNTIMES[@]} | fgrep -w $RUNTIME) ]]; then
+                    echo "Skipped due to invalid combination"
+                    continue
+                fi
+            fi
+
+            # If we have Apple silicon but an unsupported framework
+            if [[ ! $(echo ${VALID_APPLE_FRAMEWORKS[@]} | fgrep -w $FRAMEWORK) ]]; then
+                if [ $RUNTIME = "osx-arm64" ]; then
+                    echo "Skipped due to no Apple Silicon support"
+                    continue
+                fi
+            fi
+
+            # Only .NET 5 and above can publish to a single file
+            if [[ $(echo ${SINGLE_FILE_CAPABLE[@]} | fgrep -w $FRAMEWORK) ]]; then
+                # Only include Debug if set
+                if [ $INCLUDE_DEBUG = true ]; then
+                    dotnet publish NDecrypt/NDecrypt.csproj -f $FRAMEWORK -r $RUNTIME -c Debug --self-contained true --version-suffix $COMMIT -p:PublishSingleFile=true
+                fi
+                dotnet publish NDecrypt/NDecrypt.csproj -f $FRAMEWORK -r $RUNTIME -c Release --self-contained true --version-suffix $COMMIT -p:PublishSingleFile=true -p:DebugType=None -p:DebugSymbols=false
+            else
+                # Only include Debug if set
+                if [ $INCLUDE_DEBUG = true ]; then
+                    dotnet publish NDecrypt/NDecrypt.csproj -f $FRAMEWORK -r $RUNTIME -c Debug --self-contained true --version-suffix $COMMIT
+                fi
+                dotnet publish NDecrypt/NDecrypt.csproj -f $FRAMEWORK -r $RUNTIME -c Release --self-contained true --version-suffix $COMMIT -p:DebugType=None -p:DebugSymbols=false
+            fi
+        done
+    done
+fi
+
+# Only create archives if requested
+if [ $NO_ARCHIVE = false ]; then
+    # Create Test archives
+    for FRAMEWORK in "${FRAMEWORKS[@]}"; do
+        for RUNTIME in "${RUNTIMES[@]}"; do
+            # Output the current build
+            echo "===== Archive Program - $FRAMEWORK, $RUNTIME ====="
+
+            # If we have an invalid combination of framework and runtime
+            if [[ ! $(echo ${VALID_CROSS_PLATFORM_FRAMEWORKS[@]} | fgrep -w $FRAMEWORK) ]]; then
+                if [[ $(echo ${VALID_CROSS_PLATFORM_RUNTIMES[@]} | fgrep -w $RUNTIME) ]]; then
+                    echo "Skipped due to invalid combination"
+                    continue
+                fi
+            fi
+
+            # If we have Apple silicon but an unsupported framework
+            if [[ ! $(echo ${VALID_APPLE_FRAMEWORKS[@]} | fgrep -w $FRAMEWORK) ]]; then
+                if [ $RUNTIME = "osx-arm64" ]; then
+                    echo "Skipped due to no Apple Silicon support"
+                    continue
+                fi
+            fi
+
+            # Only include Debug if set
+            if [ $INCLUDE_DEBUG = true ]; then
+                cd $BUILD_FOLDER/NDecrypt/bin/Debug/${FRAMEWORK}/${RUNTIME}/publish/
+                zip -r $BUILD_FOLDER/NDecrypt_${FRAMEWORK}_${RUNTIME}_debug.zip .
+            fi
+            cd $BUILD_FOLDER/NDecrypt/bin/Release/${FRAMEWORK}/${RUNTIME}/publish/
+            zip -r $BUILD_FOLDER/NDecrypt_${FRAMEWORK}_${RUNTIME}_release.zip .
+        done
+    done
+
+    # Reset the directory
+    cd $BUILD_FOLDER
+fi

publish-win.ps1

@@ -0,0 +1,136 @@
+# This batch file assumes the following:
+# - .NET 9.0 (or newer) SDK is installed and in PATH
+# - 7-zip commandline (7z.exe) is installed and in PATH
+# - Git for Windows is installed and in PATH
+#
+# If any of these are not satisfied, the operation may fail
+# in an unpredictable way and result in an incomplete output.
+
+# Optional parameters
+param(
+    [Parameter(Mandatory = $false)]
+    [Alias("UseAll")]
+    [switch]$USE_ALL,
+
+    [Parameter(Mandatory = $false)]
+    [Alias("IncludeDebug")]
+    [switch]$INCLUDE_DEBUG,
+
+    [Parameter(Mandatory = $false)]
+    [Alias("NoBuild")]
+    [switch]$NO_BUILD,
+
+    [Parameter(Mandatory = $false)]
+    [Alias("NoArchive")]
+    [switch]$NO_ARCHIVE
+)
+
+# Set the current directory as a variable
+$BUILD_FOLDER = $PSScriptRoot
+
+# Set the current commit hash
+$COMMIT = git log --pretty=format:"%H" -1
+
+# Output the selected options
+Write-Host "Selected Options:"
+Write-Host "  Use all frameworks (-UseAll)          $USE_ALL"
+Write-Host "  Include debug builds (-IncludeDebug)  $INCLUDE_DEBUG"
+Write-Host "  No build (-NoBuild)                   $NO_BUILD"
+Write-Host "  No archive (-NoArchive)               $NO_ARCHIVE"
+Write-Host " "
+
+# Create the build matrix arrays
+$FRAMEWORKS = @('net10.0')
+$RUNTIMES = @('win-x86', 'win-x64', 'win-arm64', 'linux-x64', 'linux-arm64', 'osx-x64', 'osx-arm64')
+
+# Use expanded lists, if requested
+if ($USE_ALL.IsPresent) {
+    $FRAMEWORKS = @('net20', 'net35', 'net40', 'net452', 'net462', 'net472', 'net48', 'netcoreapp3.1', 'net5.0', 'net6.0', 'net7.0', 'net8.0', 'net9.0', 'net10.0')
+}
+
+# Create the filter arrays
+$SINGLE_FILE_CAPABLE = @('net5.0', 'net6.0', 'net7.0', 'net8.0', 'net9.0', 'net10.0')
+$VALID_APPLE_FRAMEWORKS = @('net6.0', 'net7.0', 'net8.0', 'net9.0', 'net10.0')
+$VALID_CROSS_PLATFORM_FRAMEWORKS = @('netcoreapp3.1', 'net5.0', 'net6.0', 'net7.0', 'net8.0', 'net9.0', 'net10.0')
+$VALID_CROSS_PLATFORM_RUNTIMES = @('win-arm64', 'linux-x64', 'linux-arm64', 'osx-x64', 'osx-arm64')
+
+# Only build if requested
+if (!$NO_BUILD.IsPresent) {
+    # Restore Nuget packages for all builds
+    Write-Host "Restoring Nuget packages"
+    dotnet restore
+
+    # Create Nuget Package
+    dotnet pack NDecrypt.Core\NDecrypt.Core.csproj --output $BUILD_FOLDER
+
+    # Build Program
+    foreach ($FRAMEWORK in $FRAMEWORKS) {
+        foreach ($RUNTIME in $RUNTIMES) {
+            # Output the current build
+            Write-Host "===== Build Program - $FRAMEWORK, $RUNTIME ====="
+
+            # If we have an invalid combination of framework and runtime
+            if ($VALID_CROSS_PLATFORM_FRAMEWORKS -notcontains $FRAMEWORK -and $VALID_CROSS_PLATFORM_RUNTIMES -contains $RUNTIME) {
+                Write-Host "Skipped due to invalid combination"
+                continue
+            }
+
+            # If we have Apple silicon but an unsupported framework
+            if ($VALID_APPLE_FRAMEWORKS -notcontains $FRAMEWORK -and $RUNTIME -eq 'osx-arm64') {
+                Write-Host "Skipped due to no Apple Silicon support"
+                continue
+            }
+
+            # Only .NET 5 and above can publish to a single file
+            if ($SINGLE_FILE_CAPABLE -contains $FRAMEWORK) {
+                # Only include Debug if set
+                if ($INCLUDE_DEBUG.IsPresent) {
+                    dotnet publish NDecrypt\NDecrypt.csproj -f $FRAMEWORK -r $RUNTIME -c Debug --self-contained true --version-suffix $COMMIT -p:PublishSingleFile=true
+                }
+                dotnet publish NDecrypt\NDecrypt.csproj -f $FRAMEWORK -r $RUNTIME -c Release --self-contained true --version-suffix $COMMIT -p:PublishSingleFile=true -p:DebugType=None -p:DebugSymbols=false
+            }
+            else {
+                # Only include Debug if set
+                if ($INCLUDE_DEBUG.IsPresent) {
+                    dotnet publish NDecrypt\NDecrypt.csproj -f $FRAMEWORK -r $RUNTIME -c Debug --self-contained true --version-suffix $COMMIT
+                }
+                dotnet publish NDecrypt\NDecrypt.csproj -f $FRAMEWORK -r $RUNTIME -c Release --self-contained true --version-suffix $COMMIT -p:DebugType=None -p:DebugSymbols=false
+            }
+        }
+    }
+}
+
+# Only create archives if requested
+if (!$NO_ARCHIVE.IsPresent) {
+    # Create Program archives
+    foreach ($FRAMEWORK in $FRAMEWORKS) {
+        foreach ($RUNTIME in $RUNTIMES) {
+            # Output the current build
+            Write-Host "===== Archive Program - $FRAMEWORK, $RUNTIME ====="
+
+            # If we have an invalid combination of framework and runtime
+            if ($VALID_CROSS_PLATFORM_FRAMEWORKS -notcontains $FRAMEWORK -and $VALID_CROSS_PLATFORM_RUNTIMES -contains $RUNTIME) {
+                Write-Host "Skipped due to invalid combination"
+                continue
+            }
+
+            # If we have Apple silicon but an unsupported framework
+            if ($VALID_APPLE_FRAMEWORKS -notcontains $FRAMEWORK -and $RUNTIME -eq 'osx-arm64') {
+                Write-Host "Skipped due to no Apple Silicon support"
+                continue
+            }
+
+            # Only include Debug if set
+            if ($INCLUDE_DEBUG.IsPresent) {
+                Set-Location -Path $BUILD_FOLDER\NDecrypt\bin\Debug\${FRAMEWORK}\${RUNTIME}\publish\
+                7z a -tzip $BUILD_FOLDER\NDecrypt_${FRAMEWORK}_${RUNTIME}_debug.zip *
+            }
+        
+            Set-Location -Path $BUILD_FOLDER\NDecrypt\bin\Release\${FRAMEWORK}\${RUNTIME}\publish\
+            7z a -tzip $BUILD_FOLDER\NDecrypt_${FRAMEWORK}_${RUNTIME}_release.zip *
+        }
+    }
+
+    # Reset the directory
+    Set-Location -Path $PSScriptRoot
+}