Change TFM to netcoreapp2.0

src/Microsoft.AspNetCore.Antiforgery/Internal/AntiforgeryOptionsSetup.cs

@@ -28,7 +28,7 @@ namespace Microsoft.AspNetCore.Antiforgery.Internal
 
         private static string ComputeCookieName(string applicationId)
         {
-            using (var sha256 = CryptographyAlgorithms.CreateSHA256())
+            using (var sha256 = SHA256.Create())
             {
                 var hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(applicationId));
                 var subHash = hash.Take(8).ToArray();

src/Microsoft.AspNetCore.Antiforgery/Internal/AntiforgerySerializationContext.cs

@@ -88,7 +88,7 @@ namespace Microsoft.AspNetCore.Antiforgery.Internal
             {
                 if (_sha256 == null)
                 {
-                    _sha256 = CryptographyAlgorithms.CreateSHA256();
+                    _sha256 = SHA256.Create();
                 }
 
                 return _sha256;

src/Microsoft.AspNetCore.Antiforgery/Internal/CryptographyAlgorithms.cs

@@ -1,40 +0,0 @@
-// Copyright (c) .NET Foundation. All rights reserved.
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-
-using System.Security.Cryptography;
-
-namespace Microsoft.AspNetCore.Antiforgery.Internal
-{
-    public static class CryptographyAlgorithms
-    {
-#if NETSTANDARD1_3
-        public static SHA256 CreateSHA256()
-        {
-            var sha256 = SHA256.Create();
-
-            return sha256;
-        }
-#elif NET46
-        public static SHA256 CreateSHA256()
-        {
-            SHA256 sha256;
-
-            try
-            {
-                sha256 = SHA256.Create();
-            }
-            // SHA256.Create is documented to throw this exception on FIPS compliant machines.
-            // See: https://msdn.microsoft.com/en-us/library/z08hz7ad%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396
-            catch (System.Reflection.TargetInvocationException)
-            {
-                // Fallback to a FIPS compliant SHA256 algorithm.
-                sha256 = new SHA256CryptoServiceProvider();
-            }
-
-            return sha256;
-        }
-#else
-#error target frameworks need to be updated.
-#endif
-    }
-}

src/Microsoft.AspNetCore.Antiforgery/Microsoft.AspNetCore.Antiforgery.csproj

@@ -4,7 +4,7 @@
 
   <PropertyGroup>
     <Description>An antiforgery system for ASP.NET Core designed to generate and validate tokens to prevent Cross-Site Request Forgery attacks.</Description>
-    <TargetFrameworks>netstandard1.3;net46</TargetFrameworks>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;antiforgery</PackageTags>

test/Microsoft.AspNetCore.Antiforgery.Test/Internal/DefaultClaimUidExtractorTest.cs

@@ -60,13 +60,7 @@ namespace Microsoft.AspNetCore.Antiforgery.Internal
             identity.AddClaim(new Claim(ClaimTypes.Email, "someone@antifrogery.com"));
             identity.AddClaim(new Claim(ClaimTypes.GivenName, "some"));
             identity.AddClaim(new Claim(ClaimTypes.Surname, "one"));
-#if NET46
-            // CoreCLR doesn't support an 'empty' name
             identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, string.Empty));
-#elif NETCOREAPP2_0
-#else
-#error Target framework needs to be updated
-#endif
 
             // Arrange
             var claimsIdentity = (ClaimsIdentity)identity;

test/Microsoft.AspNetCore.Antiforgery.Test/Microsoft.AspNetCore.Antiforgery.Test.csproj

@@ -3,8 +3,7 @@
   <Import Project="..\..\build\common.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.0;net46</TargetFrameworks>
-    <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netcoreapp2.0</TargetFrameworks>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>