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grantwinneygrantwinney
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2fa qr code example
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‎.gitignore‎

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.DS_Store
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*.userprefs
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.vs
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packages/

‎2FAQrCode/2FAQrCode.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 16
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VisualStudioVersion = 16.0.29102.190
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "2FAQrCode", "2FAQrCode\2FAQrCode.csproj", "{9D81373F-55F5-491A-8056-5DDE9543105C}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{9D81373F-55F5-491A-8056-5DDE9543105C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{9D81373F-55F5-491A-8056-5DDE9543105C}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{9D81373F-55F5-491A-8056-5DDE9543105C}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{9D81373F-55F5-491A-8056-5DDE9543105C}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {70A564BC-0910-4DD1-99FB-09FFFCF2FEB0}
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EndGlobalSection
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EndGlobal

‎2FAQrCode/2FAQrCode/2FAQrCode.csproj‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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<ProjectGuid>{9D81373F-55F5-491A-8056-5DDE9543105C}</ProjectGuid>
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<OutputType>WinExe</OutputType>
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<RootNamespace>_2FAQrCode</RootNamespace>
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<AssemblyName>2FAQrCode</AssemblyName>
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<TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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<ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
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<WarningLevel>4</WarningLevel>
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<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
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<Deterministic>true</Deterministic>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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<PlatformTarget>AnyCPU</PlatformTarget>
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
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<PlatformTarget>AnyCPU</PlatformTarget>
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<DebugType>pdbonly</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="Otp.NET, Version=1.2.1.0, Culture=neutral, PublicKeyToken=38a48df817e173a6, processorArchitecture=MSIL">
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<HintPath>..\packages\Otp.NET.1.2.1\lib\net45\Otp.NET.dll</HintPath>
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</Reference>
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<Reference Include="QRCoder, Version=1.3.6.0, Culture=neutral, processorArchitecture=MSIL">
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<HintPath>..\packages\QRCoder.1.3.6\lib\net40\QRCoder.dll</HintPath>
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</Reference>
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<Reference Include="System" />
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<Reference Include="System.Data" />
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<Reference Include="System.Drawing" />
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<Reference Include="System.Drawing.Common, Version=4.0.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
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<HintPath>..\packages\System.Drawing.Common.4.5.1\lib\net461\System.Drawing.Common.dll</HintPath>
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</Reference>
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<Reference Include="System.Xml" />
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<Reference Include="Microsoft.CSharp" />
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<Reference Include="System.Core" />
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<Reference Include="System.Xml.Linq" />
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<Reference Include="System.Data.DataSetExtensions" />
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<Reference Include="System.Net.Http" />
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<Reference Include="System.Xaml">
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<RequiredTargetFramework>4.0</RequiredTargetFramework>
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</Reference>
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<Reference Include="WindowsBase" />
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<Reference Include="PresentationCore" />
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<Reference Include="PresentationFramework" />
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</ItemGroup>
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<ItemGroup>
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<ApplicationDefinition Include="App.xaml">
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<Generator>MSBuild:Compile</Generator>
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<SubType>Designer</SubType>
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</ApplicationDefinition>
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<Page Include="MainWindow.xaml">
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<Generator>MSBuild:Compile</Generator>
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<SubType>Designer</SubType>
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</Page>
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<Compile Include="App.xaml.cs">
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<DependentUpon>App.xaml</DependentUpon>
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<SubType>Code</SubType>
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</Compile>
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<Compile Include="MainWindow.xaml.cs">
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<DependentUpon>MainWindow.xaml</DependentUpon>
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<SubType>Code</SubType>
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</Compile>
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</ItemGroup>
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<ItemGroup>
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<Compile Include="Properties\AssemblyInfo.cs">
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<SubType>Code</SubType>
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</Compile>
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<Compile Include="Properties\Resources.Designer.cs">
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<AutoGen>True</AutoGen>
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<DesignTime>True</DesignTime>
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<DependentUpon>Resources.resx</DependentUpon>
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</Compile>
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<Compile Include="Properties\Settings.Designer.cs">
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<AutoGen>True</AutoGen>
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<DependentUpon>Settings.settings</DependentUpon>
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<DesignTimeSharedInput>True</DesignTimeSharedInput>
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</Compile>
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<EmbeddedResource Include="Properties\Resources.resx">
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<Generator>ResXFileCodeGenerator</Generator>
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<LastGenOutput>Resources.Designer.cs</LastGenOutput>
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</EmbeddedResource>
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<None Include="packages.config" />
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<None Include="Properties\Settings.settings">
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<Generator>SettingsSingleFileGenerator</Generator>
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<LastGenOutput>Settings.Designer.cs</LastGenOutput>
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</None>
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</ItemGroup>
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<ItemGroup>
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<None Include="App.config" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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</Project>

‎2FAQrCode/2FAQrCode/App.config‎

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<?xml version="1.0" encoding="utf-8" ?>
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<configuration>
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<startup>
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<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
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</startup>
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</configuration>

‎2FAQrCode/2FAQrCode/App.xaml‎

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<Application x:Class="_2FAQrCode.App"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="clr-namespace:_2FAQrCode"
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StartupUri="MainWindow.xaml">
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<Application.Resources>
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</Application.Resources>
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</Application>

‎2FAQrCode/2FAQrCode/App.xaml.cs‎

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using System;
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using System.Collections.Generic;
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using System.Configuration;
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using System.Data;
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using System.Linq;
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using System.Threading.Tasks;
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using System.Windows;
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namespace _2FAQrCode
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{
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/// <summary>
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/// Interaction logic for App.xaml
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/// </summary>
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public partial class App : Application
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{
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}
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}

‎2FAQrCode/2FAQrCode/MainWindow.xaml‎

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<Window x:Class="_2FAQrCode.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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mc:Ignorable="d"
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Title="TOTP - QR Code" Height="560" Width="800" FontSize="20">
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<Window.Resources>
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<Style TargetType="{x:Type TextBox}">
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<Setter Property="Background" Value="LightYellow" />
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<Setter Property="VerticalContentAlignment" Value="Center" />
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<Setter Property="Width" Value="500" />
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</Style>
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<Style TargetType="{x:Type Label}">
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<Setter Property="HorizontalAlignment" Value="Left" />
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<Setter Property="Width" Value="130" />
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</Style>
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</Window.Resources>
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<Grid>
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<StackPanel>
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<StackPanel Orientation="Horizontal">
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<Label Content="Label:" />
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<TextBox Name="Label" TextChanged="Input_TextChanged" />
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</StackPanel>
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<StackPanel Orientation="Horizontal">
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<Label Content="Issuer:" />
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<TextBox Name="Issuer" TextChanged="Input_TextChanged" />
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</StackPanel>
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<StackPanel Orientation="Horizontal" Margin="0 0 0 20">
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<Label Content="Secret:" />
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<TextBox Name="Secret" TextChanged="Input_TextChanged" />
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</StackPanel>
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<StackPanel Orientation="Horizontal" Margin="0 0 0 20">
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<Label Content="QR Code:" />
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<Image Name="QrCode" Width="200" Height="200" />
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</StackPanel>
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<StackPanel Orientation="Horizontal" Margin="0 0 0 20">
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<Label Content="6-digit code:" />
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<TextBox Name="Code" />
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<Button Name="VerifyCode" Content="Verify Code" Margin="20 0" Padding="5"
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Click="VerifyCode_Click" />
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</StackPanel>
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<UniformGrid Columns="3">
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<UniformGrid.Resources>
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<Style TargetType="{x:Type Label}">
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<Setter Property="Width" Value="225" />
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</Style>
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</UniformGrid.Resources>
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<Label Content="Previous Code:" />
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<Label Content="Current Code:" />
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<Label Content="Next Code:" />
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</UniformGrid>
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<UniformGrid Columns="3">
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<UniformGrid.Resources>
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<Style TargetType="{x:Type Label}">
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<Setter Property="BorderBrush" Value="White" />
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<Setter Property="BorderThickness" Value="1" />
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<Setter Property="HorizontalAlignment" Value="Center" />
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</Style>
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</UniformGrid.Resources>
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<Label Content="Totp Code 1" Name="TotpCode1" />
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<Label Content="Totp Code 2" Name="TotpCode2" />
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<Label Content="Totp Code 3" Name="TotpCode3" />
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</UniformGrid>
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</StackPanel>
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</Grid>
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</Window>

‎2FAQrCode/2FAQrCode/MainWindow.xaml.cs‎

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using OtpNet;
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using QRCoder;
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using System;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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namespace _2FAQrCode
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{
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/// <summary>
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/// Interaction logic for MainWindow.xaml
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/// </summary>
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public partial class MainWindow : Window
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{
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readonly QRCodeGenerator qrGenerator = new QRCodeGenerator();
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const int DEFAULT_STEP = 30;
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public MainWindow()
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{
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InitializeComponent();
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Label.Focus();
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Label.Text = "one";
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Issuer.Text = "two";
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Secret.Text = Base32Encoding.ToString(KeyGeneration.GenerateRandomKey(20));
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}
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private void Input_TextChanged(object sender, TextChangedEventArgs e)
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{
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if (Label.Text != "" && Issuer.Text != "" && Secret.Text != "")
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{
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var qrCodeUri = $"otpauth://totp/{Uri.EscapeDataString(Label.Text)}?secret={Secret.Text}&issuer={Uri.EscapeDataString(Issuer.Text)}";
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using (var qrCodeData = qrGenerator.CreateQrCode(qrCodeUri, QRCodeGenerator.ECCLevel.Q))
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{
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using (var qrCode = new QRCode(qrCodeData))
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{
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var qrCodeImage = qrCode.GetGraphic(20);
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using (var memory = new MemoryStream())
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{
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qrCodeImage.Save(memory, ImageFormat.Bmp);
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memory.Position = 0;
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var bitmapImage = new BitmapImage();
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bitmapImage.BeginInit();
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bitmapImage.StreamSource = memory;
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bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
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bitmapImage.EndInit();
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QrCode.Source = bitmapImage;
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}
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}
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}
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QrCode.ToolTip = qrCodeUri;
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}
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}
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private void VerifyCode_Click(object sender, RoutedEventArgs e)
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{
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var totp = new Totp(Base32Encoding.ToBytes(Secret.Text));
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var isValidTotpCode = totp.VerifyTotp(Code.Text, out long timeStepMatched, new VerificationWindow(previous: 1, future: 1));
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var now = DateTime.UtcNow;
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var step = Math.Floor((now - new DateTime(1970, 1, 1)).TotalSeconds / DEFAULT_STEP);
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TotpCode1.Content = $"{totp.ComputeTotp(now.AddSeconds(-DEFAULT_STEP))}{Environment.NewLine}({step - 1})";
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TotpCode2.Content = $"{totp.ComputeTotp(now)}{Environment.NewLine}({step})";
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TotpCode3.Content = $"{totp.ComputeTotp(now.AddSeconds(DEFAULT_STEP))}{Environment.NewLine}({step + 1})";
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foreach (var label in new Label[] { TotpCode1, TotpCode2, TotpCode3 })
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label.BorderBrush = Brushes.White;
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if (isValidTotpCode)
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{
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if (Code.Text == TotpCode1.Content.ToString())
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TotpCode1.BorderBrush = Brushes.Green;
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else if (Code.Text == TotpCode2.Content.ToString())
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TotpCode2.BorderBrush = Brushes.Green;
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else if (Code.Text == TotpCode3.Content.ToString())
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TotpCode3.BorderBrush = Brushes.Green;
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MessageBox.Show($"Valid TOTP Code (step: {timeStepMatched})!");
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}
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else
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MessageBox.Show("Invalid TOTP Code");
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}
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}
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}

‎2FAQrCode/2FAQrCode/Properties/AssemblyInfo.cs‎

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using System.Reflection;
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using System.Resources;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Windows;
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// General Information about an assembly is controlled through the following
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// set of attributes. Change these attribute values to modify the information
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// associated with an assembly.
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[assembly: AssemblyTitle("2FAQrCode")]
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[assembly: AssemblyDescription("")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("")]
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[assembly: AssemblyProduct("2FAQrCode")]
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[assembly: AssemblyCopyright("Copyright © 2019")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// Setting ComVisible to false makes the types in this assembly not visible
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// to COM components. If you need to access a type in this assembly from
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// COM, set the ComVisible attribute to true on that type.
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[assembly: ComVisible(false)]
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//In order to begin building localizable applications, set
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//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
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//inside a <PropertyGroup>. For example, if you are using US english
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//in your source files, set the <UICulture> to en-US. Then uncomment
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//the NeutralResourceLanguage attribute below. Update the "en-US" in
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//the line below to match the UICulture setting in the project file.
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//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
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[assembly: ThemeInfo(
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ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
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//(used if a resource is not found in the page,
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// or application resource dictionaries)
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ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
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//(used if a resource is not found in the page,
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// app, or any theme specific resource dictionaries)
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)]
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// Version information for an assembly consists of the following four values:
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//
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// Major Version
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// Minor Version
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// Build Number
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// Revision
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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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// [assembly: AssemblyVersion("1.0.*")]
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[assembly: AssemblyVersion("1.0.0.0")]
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[assembly: AssemblyFileVersion("1.0.0.0")]

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