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Use native AesGcm for .NET Framework from nuget #1619

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Use native AesGcm for .NET Framework from nuget #1619

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b9d888b
Use native AesGcm for .NET Framework from nuget
scott-xu Mar 22, 2025
d49b548
Merge branch 'develop' into aesgcm-netframework
scott-xu Jun 22, 2025
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1 change: 1 addition & 0 deletions Directory.Packages.props
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
<PackageVersion Include="Meziantou.Analyzer" Version="2.0.201" />

<!-- Should stay on LTS .NET releases. -->
<PackageVersion Include="Microsoft.Bcl.Cryptography" Version="10.0.0-preview.5.25277.114" />
<PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.3" />
<PackageVersion Include="Microsoft.Extensions.Logging.Console" Version="9.0.5" />
<PackageVersion Include="MSTest" Version="3.9.1" />
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6 changes: 5 additions & 1 deletion src/Renci.SshNet/Renci.SshNet.csproj
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Expand Up @@ -49,7 +49,11 @@
</PackageReference>
</ItemGroup>

<ItemGroup Condition=" !$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0')) ">
<ItemGroup Condition=" '$(TargetFramework)' == 'net462' ">
<PackageReference Include="Microsoft.Bcl.Cryptography" />
</ItemGroup>

<ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
<PackageReference Include="System.Formats.Asn1" />
</ItemGroup>

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2 changes: 1 addition & 1 deletion src/Renci.SshNet/Security/Cryptography/Ciphers/AesGcmCipher.BclImpl.cs
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@@ -1,4 +1,4 @@
#if NET
#if !NETSTANDARD
using System;
using System.Security.Cryptography;

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14 changes: 11 additions & 3 deletions src/Renci.SshNet/Security/Cryptography/Ciphers/AesGcmCipher.cs
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Expand Up @@ -15,7 +15,7 @@ internal sealed partial class AesGcmCipher : SymmetricCipher, IDisposable
private const int TagSizeInBytes = 16;
private readonly byte[] _iv;
private readonly int _aadLength;
#if NET
#if !NETSTANDARD
private readonly Impl _impl;
#else
private readonly BouncyCastleImpl _impl;
Expand Down Expand Up @@ -62,10 +62,18 @@ public AesGcmCipher(byte[] key, byte[] iv, int aadLength)
// SSH AES-GCM requires a 12-octet Initial IV
_iv = iv.Take(12);
_aadLength = aadLength;
#if NET
#if !NETSTANDARD
if (System.Security.Cryptography.AesGcm.IsSupported)
{
_impl = new BclImpl(key, _iv);
try
{
_impl = new BclImpl(key, _iv);
}
catch (DllNotFoundException)
{
// Mono doesn't have BCrypt.dll
_impl = new BouncyCastleImpl(key, _iv);
}
}
else
#endif
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