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Add async support to SftpClient and SftpFileStream #819

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merged 11 commits into from
Dec 14, 2021
Merged

Add async support to SftpClient and SftpFileStream #819

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ca1a59f
Add FEATURE_TAP and net46 target
IgorMilavec May 4, 2021
5f74049
Add TAP async support to SftpClient and SftpFileStream
IgorMilavec May 4, 2021
d5c80f5
Add async support to DnsAbstraction and SocketAbstraction
IgorMilavec May 11, 2021
d578af7
Add async support to *Connector and refactor the hierarchy
IgorMilavec May 11, 2021
c37a884
Add ConnectAsync to BaseClient
IgorMilavec May 11, 2021
ed8e789
Minor improvements and optimizations
IgorMilavec May 13, 2021
a33cab8
Add append support to UploadFileAsync
IgorMilavec Nov 4, 2021
2235756
Change MessageListener to use long running thread
IgorMilavec Nov 12, 2021
6fb5be2
Code cleanup as requested by review
IgorMilavec Nov 21, 2021
b7fd333
Code cleanup as requested by review #2
IgorMilavec Dec 6, 2021
85839e7
Revert formatting changes
IgorMilavec Dec 6, 2021
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128 changes: 128 additions & 0 deletions src/Renci.SshNet/ISftpClient.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,12 @@
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading;
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using Renci.SshNet.Sftp;
using Renci.SshNet.Common;
#if FEATURE_TAP
using System.Threading.Tasks;
#endif

namespace Renci.SshNet
{
Expand Down Expand Up @@ -488,6 +492,22 @@ public interface ISftpClient
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
void DeleteFile(string path);

#if FEATURE_TAP
/// <summary>
/// Asynchronously deletes remote file specified by path.
/// </summary>
/// <param name="path">File to be deleted path.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> to observe.</param>
/// <returns>A <see cref="Task"/> that represents the asynchronous delete operation.</returns>
/// <exception cref="ArgumentException"><paramref name="path"/> is <b>null</b> or contains only whitespace characters.</exception>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <exception cref="SftpPathNotFoundException"><paramref name="path"/> was not found on the remote host.</exception>
/// <exception cref="SftpPermissionDeniedException">Permission to delete the file was denied by the remote host. <para>-or-</para> A SSH command was denied by the server.</exception>
/// <exception cref="SshException">A SSH error where <see cref="Exception.Message"/> is the message from the remote host.</exception>
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
Task DeleteFileAsync(string path, CancellationToken cancellationToken);
#endif

/// <summary>
/// Downloads remote file specified by the path into the stream.
/// </summary>
Expand All @@ -506,6 +526,24 @@ public interface ISftpClient
/// </remarks>
void DownloadFile(string path, Stream output, Action<ulong> downloadCallback = null);

#if FEATURE_TAP
/// <summary>
/// Asynchronously downloads remote file specified by the path into the stream.
/// </summary>
/// <param name="path">File to download.</param>
/// <param name="output">Stream to write the file into.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> to observe.</param>
/// <returns>A <see cref="Task"/> that represents the asynchronous download operation.</returns>
/// <exception cref="ArgumentNullException"><paramref name="output" /> is <b>null</b>.</exception>
/// <exception cref="ArgumentException"><paramref name="path" /> is <b>null</b> or contains only whitespace characters.</exception>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <exception cref="SftpPermissionDeniedException">Permission to perform the operation was denied by the remote host. <para>-or-</para> A SSH command was denied by the server.</exception>
/// <exception cref="SftpPathNotFoundException"><paramref name="path"/> was not found on the remote host.</exception>///
/// <exception cref="SshException">A SSH error where <see cref="Exception.Message" /> is the message from the remote host.</exception>
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
Task DownloadFileAsync(string path, Stream output, CancellationToken cancellationToken);
#endif

/// <summary>
/// Ends an asynchronous file downloading into the stream.
/// </summary>
Expand Down Expand Up @@ -653,6 +691,22 @@ public interface ISftpClient
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
SftpFileSytemInformation GetStatus(string path);

#if FEATURE_TAP
/// <summary>
/// Asynchronously gets status using statvfs@openssh.com request.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> to observe.</param>
/// <returns>
/// A <see cref="Task{SftpFileSytemInformation}"/> that represents the status operation.
/// The task result contains the <see cref="SftpFileSytemInformation"/> instance that contains file status information.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <exception cref="ArgumentNullException"><paramref name="path" /> is <b>null</b>.</exception>
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
Task<SftpFileSytemInformation> GetStatusAsync(string path, CancellationToken cancellationToken);
#endif

/// <summary>
/// Retrieves list of files in remote directory.
/// </summary>
Expand All @@ -668,6 +722,25 @@ public interface ISftpClient
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
IEnumerable<SftpFile> ListDirectory(string path, Action<int> listCallback = null);

#if FEATURE_TAP

/// <summary>
/// Asynchronously retrieves list of files in remote directory.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> to observe.</param>
/// <returns>
/// A <see cref="Task{IEnumerable}"/> that represents the asynchronous list operation.
/// The task result contains an enumerable collection of <see cref="SftpFile"/> for the files in the directory specified by <paramref name="path" />.
/// </returns>
/// <exception cref="ArgumentNullException"><paramref name="path" /> is <b>null</b>.</exception>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <exception cref="SftpPermissionDeniedException">Permission to list the contents of the directory was denied by the remote host. <para>-or-</para> A SSH command was denied by the server.</exception>
/// <exception cref="SshException">A SSH error where <see cref="Exception.Message" /> is the message from the remote host.</exception>
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
Task<IEnumerable<SftpFile>> ListDirectoryAsync(string path, CancellationToken cancellationToken);
#endif

/// <summary>
/// Opens a <see cref="SftpFileStream"/> on the specified path with read/write access.
/// </summary>
Expand Down Expand Up @@ -695,6 +768,24 @@ public interface ISftpClient
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
SftpFileStream Open(string path, FileMode mode, FileAccess access);

#if FEATURE_TAP
/// <summary>
/// Asynchronously opens a <see cref="SftpFileStream"/> on the specified path, with the specified mode and access.
/// </summary>
/// <param name="path">The file to open.</param>
/// <param name="mode">A <see cref="FileMode"/> value that specifies whether a file is created if one does not exist, and determines whether the contents of existing files are retained or overwritten.</param>
/// <param name="access">A <see cref="FileAccess"/> value that specifies the operations that can be performed on the file.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> to observe.</param>
/// <returns>
/// A <see cref="Task{SftpFileStream}"/> that represents the asynchronous open operation.
/// The task result contains the <see cref="SftpFileStream"/> that provides access to the specified file, with the specified mode and access.
/// </returns>
/// <exception cref="ArgumentNullException"><paramref name="path"/> is <b>null</b>.</exception>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
Task<SftpFileStream> OpenAsync(string path, FileMode mode, FileAccess access, CancellationToken cancellationToken);
#endif

/// <summary>
/// Opens an existing file for reading.
/// </summary>
Expand Down Expand Up @@ -833,6 +924,22 @@ public interface ISftpClient
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
void RenameFile(string oldPath, string newPath);

#if FEATURE_TAP
/// <summary>
/// Asynchronously renames remote file from old path to new path.
/// </summary>
/// <param name="oldPath">Path to the old file location.</param>
/// <param name="newPath">Path to the new file location.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> to observe.</param>
/// <returns>A <see cref="Task"/> that represents the asynchronous rename operation.</returns>
/// <exception cref="ArgumentNullException"><paramref name="oldPath"/> is <b>null</b>. <para>-or-</para> or <paramref name="newPath"/> is <b>null</b>.</exception>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <exception cref="SftpPermissionDeniedException">Permission to rename the file was denied by the remote host. <para>-or-</para> A SSH command was denied by the server.</exception>
/// <exception cref="SshException">A SSH error where <see cref="Exception.Message"/> is the message from the remote host.</exception>
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
Task RenameFileAsync(string oldPath, string newPath, CancellationToken cancellationToken);
#endif

/// <summary>
/// Renames remote file from old path to new path.
/// </summary>
Expand Down Expand Up @@ -917,6 +1024,27 @@ public interface ISftpClient
/// </remarks>
void UploadFile(Stream input, string path, bool canOverride, Action<ulong> uploadCallback = null);

#if FEATURE_TAP
/// <summary>
/// Asynchronously uploads stream into remote file.
/// </summary>
/// <param name="input">Data input stream.</param>
/// <param name="path">Remote file path.</param>
/// <param name="canOverride">if set to <c>true</c> then existing file will be overwritten.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> to observe.</param>
/// <returns>A <see cref="Task"/> that represents the asynchronous upload operation.</returns>
/// <exception cref="ArgumentNullException"><paramref name="input" /> is <b>null</b>.</exception>
/// <exception cref="ArgumentException"><paramref name="path" /> is <b>null</b> or contains only whitespace characters.</exception>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <exception cref="SftpPermissionDeniedException">Permission to upload the file was denied by the remote host. <para>-or-</para> A SSH command was denied by the server.</exception>
/// <exception cref="SshException">A SSH error where <see cref="Exception.Message" /> is the message from the remote host.</exception>
/// <exception cref="ObjectDisposedException">The method was called after the client was disposed.</exception>
/// <remarks>
/// Method calls made by this method to <paramref name="input" />, may under certain conditions result in exceptions thrown by the stream.
/// </remarks>
Task UploadFileAsync(Stream input, string path, bool canOverride, CancellationToken cancellationToken);
#endif

/// <summary>
/// Writes the specified byte array to the specified file, and closes the file.
/// </summary>
Expand Down
9 changes: 6 additions & 3 deletions src/Renci.SshNet/Renci.SshNet.csproj
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@
<AssemblyOriginatorKeyFile>../Renci.SshNet.snk</AssemblyOriginatorKeyFile>
<LangVersion>5</LangVersion>
<SignAssembly>true</SignAssembly>
<TargetFrameworks>net35;net40;netstandard1.3;netstandard2.0</TargetFrameworks>
<TargetFrameworks>net35;net40;net46;netstandard1.3;netstandard2.0</TargetFrameworks>
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I see no reason for adding .NET 4.6 support at this stage.
You remark about SshNet.Security.Cryptography is not correct. It does have a strong name.
If you really want to add a new target framework for the desktop, then I'd add .NET Framework 4.8.

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@vanillajonathan vanillajonathan Nov 20, 2021 •
edited
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Or maybe drop some target frameworks?
"netstandard2.0 ought to be enough for anybody"
.NET Framework 4.5.2, 4.6, 4.6.1 will reach End of Support on April 26, 2022
Is there reason to add net46 when .NET Framework 4.6 is .NET Standard 1.3 compatible, and .NET Framework 4.6.1 is .NET Standard 2.0 compatible?
https://docs.microsoft.com/en-us/dotnet/standard/net-standard

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While NuGet considers .NET Framework 4.6.1 as supporting .NET Standard 1.5 through 2.0, there are several issues with consuming .NET Standard libraries that were built for those versions from .NET Framework 4.6.1 projects. For .NET Framework projects that need to use such libraries, we recommend that you upgrade the project to target .NET Framework 4.7.2 or higher

I have no details on what exactly is broken.

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net46 target is needed to use TaskCreationOptions.RunContinuationsAsynchronously.
@vanillajonathan I have a couple of projects targeting net472 where I've had problems if the referenced libraries targeted net45+ AND netstandard 2.0. There is also a discussion about specific intricacies on dotnet repo, but I don't have the link at hand right now.
This is quite a tricky topic that I feel should be discussed further in #665 .

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@drieseng drieseng Nov 28, 2021 •
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@IgorMilavec, is it ok for you to target .NET Framework 4.7.2 (or 4.8) instead?

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Sure, I've raised the target to net472.

</PropertyGroup>

<!--
Expand Down Expand Up @@ -38,10 +38,13 @@
<PropertyGroup Condition=" '$(TargetFramework)' == 'net40' ">
<DefineConstants>FEATURE_STRINGBUILDER_CLEAR;FEATURE_HASHALGORITHM_DISPOSE;FEATURE_REGEX_COMPILE;FEATURE_BINARY_SERIALIZATION;FEATURE_RNG_CREATE;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_EAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_SELECT;FEATURE_SOCKET_POLL;FEATURE_SOCKET_DISPOSE;FEATURE_STREAM_APM;FEATURE_DNS_SYNC;FEATURE_THREAD_COUNTDOWNEVENT;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_WAITHANDLE_DISPOSE;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HASH_RIPEMD160_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_HMAC_RIPEMD160;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_ENCODING_ASCII;FEATURE_ECDSA</DefineConstants>
</PropertyGroup>
<PropertyGroup Condition=" '$(TargetFramework)' == 'net46' ">
<DefineConstants>FEATURE_STRINGBUILDER_CLEAR;FEATURE_HASHALGORITHM_DISPOSE;FEATURE_REGEX_COMPILE;FEATURE_BINARY_SERIALIZATION;FEATURE_RNG_CREATE;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_EAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_SELECT;FEATURE_SOCKET_POLL;FEATURE_SOCKET_DISPOSE;FEATURE_STREAM_APM;FEATURE_DNS_SYNC;FEATURE_THREAD_COUNTDOWNEVENT;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_WAITHANDLE_DISPOSE;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HASH_RIPEMD160_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_HMAC_RIPEMD160;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_ENCODING_ASCII;FEATURE_ECDSA;FEATURE_TAP</DefineConstants>
</PropertyGroup>
<PropertyGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">
<DefineConstants>FEATURE_STRINGBUILDER_CLEAR;FEATURE_HASHALGORITHM_DISPOSE;FEATURE_ENCODING_ASCII;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_DIRECTORYINFO_ENUMERATEFILES;FEATURE_MEMORYSTREAM_TRYGETBUFFER;FEATURE_REFLECTION_TYPEINFO;FEATURE_RNG_CREATE;FEATURE_SOCKET_TAP;FEATURE_SOCKET_EAP;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_SELECT;FEATURE_SOCKET_POLL;FEATURE_SOCKET_DISPOSE;FEATURE_DNS_TAP;FEATURE_STREAM_TAP;FEATURE_THREAD_COUNTDOWNEVENT;FEATURE_THREAD_TAP;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_WAITHANDLE_DISPOSE;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512</DefineConstants>
<DefineConstants>FEATURE_STRINGBUILDER_CLEAR;FEATURE_HASHALGORITHM_DISPOSE;FEATURE_ENCODING_ASCII;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_DIRECTORYINFO_ENUMERATEFILES;FEATURE_MEMORYSTREAM_TRYGETBUFFER;FEATURE_REFLECTION_TYPEINFO;FEATURE_RNG_CREATE;FEATURE_SOCKET_TAP;FEATURE_SOCKET_EAP;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_SELECT;FEATURE_SOCKET_POLL;FEATURE_SOCKET_DISPOSE;FEATURE_DNS_TAP;FEATURE_STREAM_TAP;FEATURE_THREAD_COUNTDOWNEVENT;FEATURE_THREAD_TAP;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_WAITHANDLE_DISPOSE;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_TAP</DefineConstants>
</PropertyGroup>
<PropertyGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' or '$(TargetFramework)' == 'netstandard2.1' ">
<DefineConstants>FEATURE_STRINGBUILDER_CLEAR;FEATURE_HASHALGORITHM_DISPOSE;FEATURE_ENCODING_ASCII;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_DIRECTORYINFO_ENUMERATEFILES;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_MEMORYSTREAM_TRYGETBUFFER;FEATURE_RNG_CREATE;FEATURE_SOCKET_TAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_EAP;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_SELECT;FEATURE_SOCKET_POLL;FEATURE_SOCKET_DISPOSE;FEATURE_DNS_SYNC;FEATURE_DNS_APM;FEATURE_DNS_TAP;FEATURE_STREAM_APM;FEATURE_STREAM_TAP;FEATURE_THREAD_COUNTDOWNEVENT;FEATURE_THREAD_TAP;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_WAITHANDLE_DISPOSE;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_ECDSA</DefineConstants>
<DefineConstants>FEATURE_STRINGBUILDER_CLEAR;FEATURE_HASHALGORITHM_DISPOSE;FEATURE_ENCODING_ASCII;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_DIRECTORYINFO_ENUMERATEFILES;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_MEMORYSTREAM_TRYGETBUFFER;FEATURE_RNG_CREATE;FEATURE_SOCKET_TAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_EAP;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_SELECT;FEATURE_SOCKET_POLL;FEATURE_SOCKET_DISPOSE;FEATURE_DNS_SYNC;FEATURE_DNS_APM;FEATURE_DNS_TAP;FEATURE_STREAM_APM;FEATURE_STREAM_TAP;FEATURE_THREAD_COUNTDOWNEVENT;FEATURE_THREAD_TAP;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_WAITHANDLE_DISPOSE;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_ECDSA;FEATURE_TAP</DefineConstants>
</PropertyGroup>
</Project>
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