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###############################################################################
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# Set default behavior to automatically normalize line endings.
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###############################################################################
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* text=auto
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###############################################################################
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# Set default behavior for command prompt diff.
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#
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# This is need for earlier builds of msysgit that does not have it on by
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# default for csharp files.
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# Note: This is only used by command line
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###############################################################################
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#*.cs diff=csharp
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###############################################################################
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# Set the merge driver for project and solution files
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#
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# Merging from the command prompt will add diff markers to the files if there
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# are conflicts (Merging from VS is not affected by the settings below, in VS
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# the diff markers are never inserted). Diff markers may cause the following
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# file extensions to fail to load in VS. An alternative would be to treat
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# these files as binary and thus will always conflict and require user
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# intervention with every merge. To do so, just uncomment the entries below
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###############################################################################
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#*.sln merge=binary
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#*.csproj merge=binary
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#*.vbproj merge=binary
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#*.vcxproj merge=binary
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#*.vcproj merge=binary
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#*.dbproj merge=binary
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#*.fsproj merge=binary
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#*.lsproj merge=binary
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#*.wixproj merge=binary
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#*.modelproj merge=binary
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#*.sqlproj merge=binary
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#*.wwaproj merge=binary
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###############################################################################
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# behavior for image files
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#
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# image files are treated as binary by default.
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###############################################################################
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#*.jpg binary
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#*.png binary
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#*.gif binary
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###############################################################################
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# diff behavior for common document formats
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#
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# Convert binary document formats to text before diffing them. This feature
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# is only available from the command line. Turn it on by uncommenting the
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# entries below.
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###############################################################################
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#*.doc diff=astextplain
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#*.DOC diff=astextplain
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#*.docx diff=astextplain
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#*.DOCX diff=astextplain
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#*.dot diff=astextplain
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#*.DOT diff=astextplain
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#*.pdf diff=astextplain
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#*.PDF diff=astextplain
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#*.rtf diff=astextplain
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#*.RTF diff=astextplain
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@ -0,0 +1,25 @@
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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 15
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VisualStudioVersion = 15.0.28010.2050
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Mk0.Tools.Crypt", "Mk0.Tools.Crypt\Mk0.Tools.Crypt.csproj", "{3EB0BC01-BDF3-400A-B636-1364E7F39DFC}"
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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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{3EB0BC01-BDF3-400A-B636-1364E7F39DFC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{3EB0BC01-BDF3-400A-B636-1364E7F39DFC}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{3EB0BC01-BDF3-400A-B636-1364E7F39DFC}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{3EB0BC01-BDF3-400A-B636-1364E7F39DFC}.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 = {29E95C2A-B32C-412C-B77B-82872B3AE5B5}
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EndGlobalSection
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EndGlobal
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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>{3EB0BC01-BDF3-400A-B636-1364E7F39DFC}</ProjectGuid>
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<OutputType>Library</OutputType>
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<AppDesignerFolder>Properties</AppDesignerFolder>
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<RootNamespace>Mk0.Tools.Crypt</RootNamespace>
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<AssemblyName>Mk0.Tools.Crypt</AssemblyName>
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<TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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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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<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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<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="System" />
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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="Microsoft.CSharp" />
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<Reference Include="System.Data" />
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<Reference Include="System.Net.Http" />
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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="StringCipher.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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</Project>
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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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// Allgemeine Informationen über eine Assembly werden über die folgenden
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// Attribute gesteuert. Ändern Sie diese Attributwerte, um die Informationen zu ändern,
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// die einer Assembly zugeordnet sind.
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[assembly: AssemblyTitle("Mk0.Tools.Crypt")]
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[assembly: AssemblyDescription("")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("")]
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[assembly: AssemblyProduct("Mk0.Tools.Crypt")]
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[assembly: AssemblyCopyright("Copyright © 2019 mk0.at")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// Durch Festlegen von ComVisible auf FALSE werden die Typen in dieser Assembly
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// für COM-Komponenten unsichtbar. Wenn Sie auf einen Typ in dieser Assembly von
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// COM aus zugreifen müssen, sollten Sie das ComVisible-Attribut für diesen Typ auf "True" festlegen.
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[assembly: ComVisible(false)]
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// Die folgende GUID bestimmt die ID der Typbibliothek, wenn dieses Projekt für COM verfügbar gemacht wird
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[assembly: Guid("3eb0bc01-bdf3-400a-b636-1364e7f39dfc")]
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// Versionsinformationen für eine Assembly bestehen aus den folgenden vier Werten:
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//
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// Hauptversion
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// Nebenversion
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// Buildnummer
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// Revision
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//
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// Sie können alle Werte angeben oder Standardwerte für die Build- und Revisionsnummern verwenden,
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// indem Sie "*" wie unten gezeigt eingeben:
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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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using System;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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namespace Mk0.Tools.Crypt
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{
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public static class StringCipher
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{
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// This constant is used to determine the keysize of the encryption algorithm in bits.
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// We divide this by 8 within the code below to get the equivalent number of bytes.
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private const int Keysize = 256;
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// This constant determines the number of iterations for the password bytes generation function.
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private const int DerivationIterations = 1000;
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public static string Encrypt(string plainText, string passPhrase)
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{
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// Salt and IV is randomly generated each time, but is preprended to encrypted cipher text
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// so that the same Salt and IV values can be used when decrypting.
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var saltStringBytes = Generate256BitsOfRandomEntropy();
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var ivStringBytes = Generate256BitsOfRandomEntropy();
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var plainTextBytes = Encoding.UTF8.GetBytes(plainText);
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using (var password = new Rfc2898DeriveBytes(passPhrase, saltStringBytes, DerivationIterations))
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{
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var keyBytes = password.GetBytes(Keysize / 8);
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using (var symmetricKey = new RijndaelManaged())
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{
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symmetricKey.BlockSize = 256;
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symmetricKey.Mode = CipherMode.CBC;
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symmetricKey.Padding = PaddingMode.PKCS7;
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using (var encryptor = symmetricKey.CreateEncryptor(keyBytes, ivStringBytes))
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{
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using (var memoryStream = new MemoryStream())
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{
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using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
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{
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cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
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cryptoStream.FlushFinalBlock();
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// Create the final bytes as a concatenation of the random salt bytes, the random iv bytes and the cipher bytes.
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var cipherTextBytes = saltStringBytes;
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cipherTextBytes = cipherTextBytes.Concat(ivStringBytes).ToArray();
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cipherTextBytes = cipherTextBytes.Concat(memoryStream.ToArray()).ToArray();
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memoryStream.Close();
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cryptoStream.Close();
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return Convert.ToBase64String(cipherTextBytes);
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}
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}
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}
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}
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}
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}
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public static string Decrypt(string cipherText, string passPhrase)
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{
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// Get the complete stream of bytes that represent:
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// [256 bytes of Salt] + [256 bytes of IV] + [n bytes of CipherText]
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var cipherTextBytesWithSaltAndIv = Convert.FromBase64String(cipherText);
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// Get the saltbytes by extracting the first 32 bytes from the supplied cipherText bytes.
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var saltStringBytes = cipherTextBytesWithSaltAndIv.Take(Keysize / 8).ToArray();
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// Get the IV bytes by extracting the next 32 bytes from the supplied cipherText bytes.
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var ivStringBytes = cipherTextBytesWithSaltAndIv.Skip(Keysize / 8).Take(Keysize / 8).ToArray();
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// Get the actual cipher text bytes by removing the first 64 bytes from the cipherText string.
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var cipherTextBytes = cipherTextBytesWithSaltAndIv.Skip((Keysize / 8) * 2).Take(cipherTextBytesWithSaltAndIv.Length - ((Keysize / 8) * 2)).ToArray();
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using (var password = new Rfc2898DeriveBytes(passPhrase, saltStringBytes, DerivationIterations))
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{
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var keyBytes = password.GetBytes(Keysize / 8);
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using (var symmetricKey = new RijndaelManaged())
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{
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symmetricKey.BlockSize = 256;
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symmetricKey.Mode = CipherMode.CBC;
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symmetricKey.Padding = PaddingMode.PKCS7;
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using (var decryptor = symmetricKey.CreateDecryptor(keyBytes, ivStringBytes))
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{
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using (var memoryStream = new MemoryStream(cipherTextBytes))
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{
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using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
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{
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var plainTextBytes = new byte[cipherTextBytes.Length];
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var decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
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memoryStream.Close();
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cryptoStream.Close();
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return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
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}
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}
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}
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}
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}
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}
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private static byte[] Generate256BitsOfRandomEntropy()
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{
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var randomBytes = new byte[32]; // 32 Bytes will give us 256 bits.
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using (var rngCsp = new RNGCryptoServiceProvider())
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{
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// Fill the array with cryptographically secure random bytes.
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rngCsp.GetBytes(randomBytes);
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}
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return randomBytes;
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}
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private static byte[] Generate2048BitsOfRandomEntropy()
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{
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var randomBytes = new byte[256]; // 256 Bytes will give us 2048 bits.
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using (var rngCsp = new RNGCryptoServiceProvider())
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{
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// Fill the array with cryptographically secure random bytes.
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rngCsp.GetBytes(randomBytes);
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}
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return randomBytes;
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}
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}
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}
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