Browse Source

Made AesStream handle syncing with the counter of the cipher.

tags/3.0.0
Teknikode 2 years ago
parent
commit
72e5f4b62e

+ 1
- 1
ServerMaint/Program.cs View File

@@ -168,7 +168,7 @@ namespace ServerMaint
byte[] keyBytes = Encoding.UTF8.GetBytes(upload.Key);
byte[] ivBytes = Encoding.UTF8.GetBytes(upload.IV);
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
AESCryptoStream aesStream = new AESCryptoStream(fs, false, keyBytes, ivBytes, "CTR", "NoPadding", 0);
AESCryptoStream aesStream = new AESCryptoStream(fs, false, keyBytes, ivBytes, "CTR", "NoPadding");

// We have the data, let's scan it
ClamScanResult scanResult = clam.SendAndScanFile(aesStream);

+ 0
- 10
Teknik.sln View File

@@ -26,8 +26,6 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Configuration", "Utilities\
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TeknikStreaming", "TeknikStreaming\TeknikStreaming.csproj", "{7695CE9A-A0DB-4D73-BC9B-2206481F0254}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Security", "Utilities\Security\Security.csproj", "{2BB2F552-B80F-41F2-937D-5D73F15C6DC4}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@@ -93,14 +91,6 @@ Global
{7695CE9A-A0DB-4D73-BC9B-2206481F0254}.Release|Any CPU.Build.0 = Release|Any CPU
{7695CE9A-A0DB-4D73-BC9B-2206481F0254}.Release|x64.ActiveCfg = Release|Any CPU
{7695CE9A-A0DB-4D73-BC9B-2206481F0254}.Release|x64.Build.0 = Release|Any CPU
{2BB2F552-B80F-41F2-937D-5D73F15C6DC4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{2BB2F552-B80F-41F2-937D-5D73F15C6DC4}.Debug|Any CPU.Build.0 = Debug|Any CPU
{2BB2F552-B80F-41F2-937D-5D73F15C6DC4}.Debug|x64.ActiveCfg = Debug|Any CPU
{2BB2F552-B80F-41F2-937D-5D73F15C6DC4}.Debug|x64.Build.0 = Debug|Any CPU
{2BB2F552-B80F-41F2-937D-5D73F15C6DC4}.Release|Any CPU.ActiveCfg = Release|Any CPU
{2BB2F552-B80F-41F2-937D-5D73F15C6DC4}.Release|Any CPU.Build.0 = Release|Any CPU
{2BB2F552-B80F-41F2-937D-5D73F15C6DC4}.Release|x64.ActiveCfg = Release|Any CPU
{2BB2F552-B80F-41F2-937D-5D73F15C6DC4}.Release|x64.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE

+ 1
- 4
Teknik/Areas/Upload/Controllers/UploadController.cs View File

@@ -292,12 +292,9 @@ namespace Teknik.Areas.Upload.Controllers
byte[] keyBytes = Encoding.UTF8.GetBytes(key);
byte[] ivBytes = Encoding.UTF8.GetBytes(iv);

// Calculate the block offset needed for the counter
int counterOffset = (int)Math.Floor(startByte / 16.0);

return new FileGenerateResult(url,
contentType,
(response) => ResponseHelper.StreamToOutput(response, true, new AESCryptoStream(fs, false, keyBytes, ivBytes, "CTR", "NoPadding", counterOffset), (int)length, Config.UploadConfig.ChunkSize),
(response) => ResponseHelper.StreamToOutput(response, true, new AESCryptoStream(fs, false, keyBytes, ivBytes, "CTR", "NoPadding"), (int)length, Config.UploadConfig.ChunkSize),
false);
}
else // Otherwise just send it

+ 0
- 4
Teknik/Teknik.csproj View File

@@ -802,10 +802,6 @@
<Project>{c492c2c6-d45a-498b-84a2-6d4c8bf9de77}</Project>
<Name>Piwik</Name>
</ProjectReference>
<ProjectReference Include="..\Utilities\Security\Security.csproj">
<Project>{2bb2f552-b80f-41f2-937d-5d73f15c6dc4}</Project>
<Name>Security</Name>
</ProjectReference>
<ProjectReference Include="..\Utilities\Utilities\Utilities.csproj">
<Project>{f45de6fc-3754-4954-a20a-4277362cc6c1}</Project>
<Name>Utilities</Name>

+ 0
- 137
Utilities/Security/Cryptography/AesCounterMode.cs View File

@@ -1,137 +0,0 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace Teknik.Security.Cryptography
{
public class AesCounterMode : SymmetricAlgorithm
{
private const int _blockSize = 16;
private readonly byte[] _counter;
private readonly AesManaged _aes;

public AesCounterMode(byte[] counter)
{
if (counter == null) throw new ArgumentNullException("counter");
if (counter.Length != _blockSize)
throw new ArgumentException(String.Format("Counter size must be same as block size (actual: {0}, expected: {1})",
counter.Length, _blockSize));

_aes = new AesManaged
{
Mode = CipherMode.ECB,
Padding = PaddingMode.None
};

_counter = counter;
}

public override ICryptoTransform CreateEncryptor(byte[] key, byte[] iv)
{
return new CounterModeCryptoTransform(_aes, key, iv, _counter);
}

public override ICryptoTransform CreateDecryptor(byte[] key, byte[] iv)
{
return new CounterModeCryptoTransform(_aes, key, iv, _counter);
}

public override void GenerateKey()
{
_aes.GenerateKey();
}

public override void GenerateIV()
{
// IV not needed in Counter Mode
}
}

public class CounterModeCryptoTransform : ICryptoTransform
{
private readonly byte[] _iv;
private readonly byte[] _counter;
private readonly ICryptoTransform _counterEncryptor;
private readonly Queue<byte> _xorMask = new Queue<byte>();
private readonly SymmetricAlgorithm _symmetricAlgorithm;

public CounterModeCryptoTransform(SymmetricAlgorithm symmetricAlgorithm, byte[] key, byte[] iv, byte[] counter)
{
if (symmetricAlgorithm == null) throw new ArgumentNullException("symmetricAlgorithm");
if (key == null) throw new ArgumentNullException("key");
if (iv == null) throw new ArgumentNullException("counter");
if (iv.Length != symmetricAlgorithm.BlockSize / 8)
throw new ArgumentException(String.Format("Counter size must be same as block size (actual: {0}, expected: {1})",
iv.Length, symmetricAlgorithm.BlockSize / 8));

_symmetricAlgorithm = symmetricAlgorithm;
_counter = counter;
_iv = iv;
_counterEncryptor = symmetricAlgorithm.CreateEncryptor(key, iv);
}

public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount)
{
var output = new byte[inputCount];
TransformBlock(inputBuffer, inputOffset, inputCount, output, 0);
return output;
}

public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
for (var i = 0; i < inputCount; i++)
{
if (NeedMoreXorMaskBytes()) EncryptCounterThenIncrement();

var mask = _xorMask.Dequeue();
outputBuffer[outputOffset + i] = (byte)(mask ^ inputBuffer[inputOffset + i]);
}

return inputCount;
}

private bool NeedMoreXorMaskBytes()
{
return _xorMask.Count == 0;
}

private void EncryptCounterThenIncrement()
{
var counterModeBlock = new byte[_symmetricAlgorithm.BlockSize / 8];

_counterEncryptor.TransformBlock(_counter, 0, _counter.Length, counterModeBlock, 0);
IncrementCounter();

foreach (var b in counterModeBlock)
{
_xorMask.Enqueue(b);
}
}

private void IncrementCounter()
{
int j = _counter.Length;
while (--j >= 0 && ++_counter[j] == 0)
{
}
//for (var i = _counter.Length - 1; i >= 0; i--)
//{
// if (++_counter[i] != 0)
// break;
//}
}

public int InputBlockSize { get { return _symmetricAlgorithm.BlockSize / 8; } }
public int OutputBlockSize { get { return _symmetricAlgorithm.BlockSize / 8; } }
public bool CanTransformMultipleBlocks { get { return true; } }
public bool CanReuseTransform { get { return false; } }

public void Dispose()
{
}
}
}

+ 0
- 36
Utilities/Security/Properties/AssemblyInfo.cs View File

@@ -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("Teknik Security Utilities")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("Teknik")]
[assembly: AssemblyCopyright("Copyright © 2017")]
[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("2bb2f552-b80f-41f2-937d-5d73f15c6dc4")]

// 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")]

+ 0
- 55
Utilities/Security/Security.csproj View File

@@ -1,55 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="14.0" DefaultTargets="Build" 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>{2BB2F552-B80F-41F2-937D-5D73F15C6DC4}</ProjectGuid>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>Teknik.Security</RootNamespace>
<AssemblyName>Teknik.Security</AssemblyName>
<TargetFrameworkVersion>v4.6.2</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<TargetFrameworkProfile />
</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>
<ItemGroup>
<Reference Include="System" />
<Reference Include="System.Core" />
<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="Cryptography\AesCounterMode.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
Other similar extension points exist, see Microsoft.Common.targets.
<Target Name="BeforeBuild">
</Target>
<Target Name="AfterBuild">
</Target>
-->
</Project>

+ 187
- 0
Utilities/Utilities/Cryptography/AesCounterMode.cs View File

@@ -0,0 +1,187 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace Teknik.Utilities.Cryptography
{
public class AesCounterMode : SymmetricAlgorithm
{
// Internal Variables
private const int _BlockSize = 16;
private readonly byte[] _Counter;
private readonly AesManaged _Algo;

public AesCounterMode() : this(new byte[_BlockSize]) { }

public AesCounterMode(byte[] counter)
{
if (counter == null) throw new ArgumentNullException("counter");
if (counter.Length != _BlockSize)
throw new ArgumentException(String.Format("Counter size must be same as block size (actual: {0}, expected: {1})",
counter.Length, _BlockSize));

// Generate a new instance of the Aes Algorithm in ECB mode with no padding
_Algo = new AesManaged
{
Mode = CipherMode.ECB,
Padding = PaddingMode.None
};

// Set the internal variables
_Counter = counter;
}

public override ICryptoTransform CreateEncryptor(byte[] key, byte[] iv)
{
return new CounterModeCryptoTransform(_Algo, key, iv, _Counter);
}

public override ICryptoTransform CreateDecryptor(byte[] key, byte[] iv)
{
return new CounterModeCryptoTransform(_Algo, key, iv, _Counter);
}

public override void GenerateKey()
{
_Algo.GenerateKey();
}

public override void GenerateIV()
{
_Algo.GenerateIV();
}
}

public class CounterModeCryptoTransform : ICryptoTransform
{
private readonly byte[] _IV;
private readonly byte[] _Counter;
private readonly ICryptoTransform _CounterEncryptor;
private readonly SymmetricAlgorithm _SymmetricAlgorithm;

// Stateful Fields
private byte[] _EncryptedCounter;

private int _Iterations;
public int Iterations
{
get
{
return _Iterations;
}
}

private int _CounterPosition;
public int CounterPosition
{
get
{
return _CounterPosition;
}
set
{
if (value > 0 && value < _EncryptedCounter.Length)
{
_CounterPosition = value;
}
}
}

public CounterModeCryptoTransform(SymmetricAlgorithm symmetricAlgorithm, byte[] key, byte[] iv, byte[] counter)
{
if (symmetricAlgorithm == null) throw new ArgumentNullException("symmetricAlgorithm");
if (key == null) throw new ArgumentNullException("key");
if (iv == null) throw new ArgumentNullException("iv");
if (counter == null) throw new ArgumentNullException("counter");

// Check lengths
if (counter.Length != symmetricAlgorithm.BlockSize / 8)
throw new ArgumentException(String.Format("Counter size must be same as block size (actual: {0}, expected: {1})",
counter.Length, symmetricAlgorithm.BlockSize / 8));

_SymmetricAlgorithm = symmetricAlgorithm;
_IV = iv;
_Counter = counter;
_CounterEncryptor = symmetricAlgorithm.CreateEncryptor(key, iv);

// Initialize State
_CounterPosition = 0;
_Iterations = 0;

// Encrypt the counter
EncryptCounter();
}

public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount)
{
var output = new byte[inputCount];
TransformBlock(inputBuffer, inputOffset, inputCount, output, 0);
return output;
}

public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
for (var i = 0; i < inputCount; i++)
{
// Encrypt the counter if we have reached the end, or
if (_CounterPosition >= _EncryptedCounter.Length)
{
// Encrypt the counter
EncryptCounter();

//Reset current counter position
_CounterPosition = 0;

// Increment the counter for the next run
IncrementCounter();
}
// XOR the encrypted counter with the input plain text
outputBuffer[outputOffset + i] = (byte)(_EncryptedCounter[_CounterPosition] ^ inputBuffer[inputOffset + i]);

// Move the counter position
_CounterPosition++;
}

return inputCount;
}

public void EncryptCounter()
{
// Clear the encrypted counter
_EncryptedCounter = new byte[_SymmetricAlgorithm.BlockSize / 8];

// Encrypt the current counter to the encrypted counter
_CounterEncryptor.TransformBlock(_Counter, 0, _Counter.Length, _EncryptedCounter, 0);
}

public void ResetCounter()
{
Array.Clear(_Counter, 0, _Counter.Length);
Array.Copy(_IV, 0, _Counter, 0, _IV.Length);
_Iterations = 0;
}

public void IncrementCounter()
{
int j = _Counter.Length;
while (--j >= 0 && ++_Counter[j] == 0)
{
}
_Iterations++;
}

public int InputBlockSize { get { return _SymmetricAlgorithm.BlockSize / 8; } }
public int OutputBlockSize { get { return _SymmetricAlgorithm.BlockSize / 8; } }
public bool CanTransformMultipleBlocks { get { return true; } }
public bool CanReuseTransform { get { return false; } }

public void Dispose()
{
}
}
}

+ 63
- 69
Utilities/Utilities/StreamHelper.cs View File

@@ -5,105 +5,59 @@ using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using Teknik.Security.Cryptography;
using Teknik.Utilities.Cryptography;

namespace Teknik.Utilities
{
public class AESCryptoStream : Stream
{
private Stream _Inner;
//private IBufferedCipher _Cipher;
private ICryptoTransform _Cipher;
private CounterModeCryptoTransform _Cipher;

public AESCryptoStream(Stream stream, bool encrypt, byte[] key, byte[] iv, string mode, string padding, int initCounter)
public AESCryptoStream(Stream stream, bool encrypt, byte[] key, byte[] iv, string mode, string padding)
{
_Inner = stream;

// Create initial counter value from IV
byte[] counter = new byte[iv.Length];
iv.CopyTo(counter, 0);

// Increment the counter depending on the init counter
for (int i = 0; i < initCounter; i++)
{
int j = counter.Length;
while (--j >= 0 && ++counter[j] == 0) { }
}

// Create the Aes Cipher
AesCounterMode aes = new AesCounterMode(counter);
AesCounterMode aes = new AesCounterMode(iv);
if (encrypt)
{
_Cipher = aes.CreateEncryptor(key, iv); // Encrypt
_Cipher = (CounterModeCryptoTransform)aes.CreateEncryptor(key, iv); // Encrypt
}
else
{
_Cipher = aes.CreateDecryptor(key, iv); // Decrypt
_Cipher = (CounterModeCryptoTransform)aes.CreateDecryptor(key, iv); // Decrypt
}

// Sync the counter
SyncCounter();
}

public override int Read(byte[] buffer, int offset, int count)
{
if (_Inner != null && CanRead)
{
int bytesRead = 0;
int totalBytesRead = 0;
int bytesProcessed = 0;
long startPosition = _Inner.Position;
int blockSize = _Cipher.InputBlockSize;
long byteOffset = (startPosition % blockSize);
int initialOffset = (int)byteOffset;
int blockOffset = (byteOffset == 0) ? 0 : 1;
int blocksToProcess = (int)Math.Ceiling(count / (double)blockSize) + blockOffset;

// Determine if we are at the start of a block, or not
if (byteOffset != 0)
{
// We are not a multiple of the block size, so let's backup to get the current block
_Inner.Seek(startPosition - byteOffset, SeekOrigin.Begin);
}

// Initialize buffers
byte[] readBuf = new byte[blockSize];
byte[] outBuf = new byte[blockSize];
byte[] readBuf = new byte[count];
int processed = 0;

// Iterate through each block of the ammount we want to read
for (int i = 0; i < blocksToProcess; i++)
// Read the data from the stream
int bytesRead = _Inner.Read(readBuf, 0, count);
if (bytesRead > 0)
{
// Read the next block of data
totalBytesRead += bytesRead = _Inner.Read(readBuf, 0, blockSize);
if (bytesRead > 0)
{
// process the cipher for the read block and add it to the output
int processed = _Cipher.TransformBlock(readBuf, 0, bytesRead, outBuf, 0);

// copy the values to the output
outBuf.Skip(initialOffset).ToArray().CopyTo(buffer, bytesProcessed + offset);

// Reset initial offset and calibrate
bytesProcessed += processed - initialOffset;

// Reset initial offset
initialOffset = 0;
}

// Clear the read buffer
Array.Clear(readBuf, 0, blockSize);
// Process the
processed = _Cipher.TransformBlock(readBuf, 0, bytesRead, buffer, 0);
}

// Adjust bytes read by the block offset
totalBytesRead -= (int)byteOffset;
bytesProcessed -= (int)byteOffset;

if (bytesProcessed < count)
// Do we have more?
if (processed < bytesRead)
{
// Finalize the cipher
byte[] finalBuf = _Cipher.TransformFinalBlock(readBuf, bytesProcessed, bytesRead);
finalBuf.Take(count - bytesProcessed).ToArray().CopyTo(buffer, bytesProcessed);
bytesProcessed += count - bytesProcessed;
byte[] finalBuf = _Cipher.TransformFinalBlock(readBuf, processed, bytesRead);
finalBuf.CopyTo(buffer, processed);
processed += finalBuf.Length;
}

return bytesProcessed;
return processed;
}
return -1;
}
@@ -187,6 +141,9 @@ namespace Teknik.Utilities
if (_Inner != null)
{
_Inner.Position = value;

// Sync the counter
SyncCounter();
}
}
}
@@ -203,7 +160,12 @@ namespace Teknik.Utilities
{
if (_Inner != null)
{
return _Inner.Seek(offset, origin);
long newPos = _Inner.Seek(offset, origin);

// Sync the counter
SyncCounter();

return newPos;
}
return -1;
}
@@ -215,5 +177,37 @@ namespace Teknik.Utilities
_Inner.SetLength(value);
}
}

private void SyncCounter()
{
if (_Cipher != null)
{
// Calculate the counter iterations and position needed
int iterations = (int)Math.Floor(_Inner.Position / (decimal)_Cipher.InputBlockSize);
int counterPos = (int)(_Inner.Position % _Cipher.InputBlockSize);

// Are we out of sync with the cipher?
if (_Cipher.Iterations != iterations || _Cipher.CounterPosition != counterPos)
{
// Reset the current counter
_Cipher.ResetCounter();

// Iterate the counter to the current position
for (int i = 0; i < iterations; i++)
{
_Cipher.IncrementCounter();
}

// Encrypt the counter
_Cipher.EncryptCounter();

// Set the current position of the counter
_Cipher.CounterPosition = counterPos;

// Increment the counter for the next time
_Cipher.IncrementCounter();
}
}
}
}
}

+ 1
- 6
Utilities/Utilities/Utilities.csproj View File

@@ -106,6 +106,7 @@
</ItemGroup>
<ItemGroup>
<Compile Include="AccountType.cs" />
<Compile Include="Cryptography\AesCounterMode.cs" />
<Compile Include="CurrencyHelper.cs" />
<Compile Include="CurrencyType.cs" />
<Compile Include="EntityExtensions.cs" />
@@ -139,12 +140,6 @@
<None Include="app.config" />
<None Include="packages.config" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\Security\Security.csproj">
<Project>{2bb2f552-b80f-41f2-937d-5d73f15c6dc4}</Project>
<Name>Security</Name>
</ProjectReference>
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
<Import Project="..\..\packages\GitVersionTask.3.6.5\build\dotnet\GitVersionTask.targets" Condition="Exists('..\..\packages\GitVersionTask.3.6.5\build\dotnet\GitVersionTask.targets')" />
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">

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