Added support for .NET 6

Author: daviddesmet

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "5.0.100",
+    "version": "6.0.101",
     "rollForward": "latestFeature"
   }
 }

src/NaCl.Core/Base/Snuffle.cs

@@ -87,7 +87,7 @@ public virtual byte[] Encrypt(ReadOnlySpan<byte> plaintext)
 
             var ciphertext = new byte[plaintext.Length + NonceSizeInBytes];
 
-#if NETCOREAPP3_1
+#if NETCOREAPP3_1_OR_GREATER
             Span<byte> nonce = stackalloc byte[NonceSizeInBytes];
             RandomNumberGenerator.Fill(nonce);
 

src/NaCl.Core/NaCl.Core.csproj

@@ -1,8 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup Label="Build">
-    <TargetFrameworks>netstandard1.6;netstandard2.0;netstandard2.1;netcoreapp3.1;net5.0</TargetFrameworks>
-    <TargetFrameworks Condition="'$(OS)' != 'Unix'">netstandard1.6;netstandard2.0;netstandard2.1;netcoreapp3.1;net45;net48;net5.0</TargetFrameworks>
+    <TargetFrameworks>netstandard1.6;netstandard2.0;netstandard2.1;netcoreapp3.1;net5.0;net6.0</TargetFrameworks>
+    <TargetFrameworks Condition="'$(OS)' != 'Unix'">netstandard1.6;netstandard2.0;netstandard2.1;netcoreapp3.1;net45;net48;net5.0;net6.0</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <LangVersion>latest</LangVersion>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
@@ -53,11 +53,11 @@
     </PackageReference>
   </ItemGroup>
 
-  <ItemGroup Label="Package References for Windows" Condition="$(TargetFramework) != 'net5.0' AND $(TargetFramework) != 'netcoreapp3.1' AND $(TargetFramework) != 'netstandard2.1'">
+  <ItemGroup Label="Package References for Windows" Condition="$(TargetFramework) != 'net6.0' AND $(TargetFramework) != 'net5.0' AND $(TargetFramework) != 'netcoreapp3.1' AND $(TargetFramework) != 'netstandard2.1'">
     <PackageReference Include="System.Memory" Version="4.5.4" />
   </ItemGroup>
 
-  <PropertyGroup Label="Constants Definition" Condition="$(TargetFramework) == 'netcoreapp3.1' OR $(TargetFramework) == 'net5.0'">
+  <PropertyGroup Label="Constants Definition" Condition="$(TargetFramework) == 'netcoreapp3.1' OR $(TargetFramework) == 'net5.0' OR $(TargetFramework) == 'net6.0'">
     <DefineConstants>FCL_BITOPS</DefineConstants>
   </PropertyGroup>
 

test/NaCl.Core.Benchmarks/ChaCha20Poly1305Benchmark.cs

@@ -52,7 +52,7 @@ public void Setup()
 
             ciphertext = new byte[message.Length];
 
-            aead = new ChaCha20Poly1305(key);
+            aead = new ChaCha20Poly1305(key.Span);
         }
 
         [Benchmark]

test/NaCl.Core.Benchmarks/NaCl.Core.Benchmarks.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup Label="Build">
     <OutputType>Exe</OutputType>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <IsPackable>false</IsPackable>
   </PropertyGroup>