diff --git a/src/Microsoft.AspNetCore.Cryptography.Internal/CryptoUtil.cs b/src/Microsoft.AspNetCore.Cryptography.Internal/CryptoUtil.cs
index bc8bc56..8a268af 100644
--- a/src/Microsoft.AspNetCore.Cryptography.Internal/CryptoUtil.cs
+++ b/src/Microsoft.AspNetCore.Cryptography.Internal/CryptoUtil.cs
@@ -9,7 +9,7 @@ using System.Security.Cryptography;
 using Microsoft.AspNetCore.Cryptography.Cng;
 using Microsoft.AspNetCore.Cryptography.Internal;
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
 using System.Runtime.ConstrainedExecution;
 #endif
 
@@ -73,7 +73,7 @@ namespace Microsoft.AspNetCore.Cryptography
         }
 
         [MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.NoOptimization)]
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
 #endif
         public static bool TimeConstantBuffersAreEqual(byte* bufA, byte* bufB, uint count)
diff --git a/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SafeHandleZeroOrMinusOneIsInvalid.cs b/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SafeHandleZeroOrMinusOneIsInvalid.cs
index 39e3ec7..2c7ca7e 100644
--- a/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SafeHandleZeroOrMinusOneIsInvalid.cs
+++ b/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SafeHandleZeroOrMinusOneIsInvalid.cs
@@ -4,7 +4,7 @@
 using System;
 using System.Runtime.InteropServices;
 
-#if DOTNET5_4
+#if NETSTANDARD1_3
 namespace Microsoft.Win32.SafeHandles
 {
     internal abstract class SafeHandleZeroOrMinusOneIsInvalid : SafeHandle
diff --git a/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SafeLibraryHandle.cs b/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SafeLibraryHandle.cs
index 28920c4..c6ed164 100644
--- a/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SafeLibraryHandle.cs
+++ b/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SafeLibraryHandle.cs
@@ -6,7 +6,7 @@ using System.Runtime.InteropServices;
 using System.Security;
 using Microsoft.Win32.SafeHandles;
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
 using System.Runtime.ConstrainedExecution;
 #endif
 
@@ -127,12 +127,12 @@ namespace Microsoft.AspNetCore.Cryptography.SafeHandles
             return UnsafeNativeMethods.FreeLibrary(handle);
         }
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [SuppressUnmanagedCodeSecurity]
 #endif
         private static class UnsafeNativeMethods
         {
-#if DOTNET5_4
+#if NETSTANDARD1_3
             private const string CORE_LIBRARY_LOADER_LIB = "api-ms-win-core-libraryloader-l1-1-0.dll";
             private const string CORE_LOCALIZATION_LIB = "api-ms-win-core-localization-l1-2-0.dll";
 #else
@@ -140,7 +140,7 @@ namespace Microsoft.AspNetCore.Cryptography.SafeHandles
 #endif
 
             // http://msdn.microsoft.com/en-us/library/windows/desktop/ms679351(v=vs.85).aspx
-#if DOTNET5_4
+#if NETSTANDARD1_3
             [DllImport(CORE_LOCALIZATION_LIB, EntryPoint = "FormatMessageW", CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Unicode, SetLastError = true)]
 #else
             [DllImport(KERNEL32_LIB, EntryPoint = "FormatMessageW", CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Unicode, SetLastError = true)]
@@ -157,7 +157,7 @@ namespace Microsoft.AspNetCore.Cryptography.SafeHandles
 
             // http://msdn.microsoft.com/en-us/library/ms683152(v=vs.85).aspx
             [return: MarshalAs(UnmanagedType.Bool)]
-#if DOTNET5_4
+#if NETSTANDARD1_3
             [DllImport(CORE_LIBRARY_LOADER_LIB, CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Unicode)]
 #else
             [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
@@ -167,7 +167,7 @@ namespace Microsoft.AspNetCore.Cryptography.SafeHandles
 
             // http://msdn.microsoft.com/en-us/library/ms683200(v=vs.85).aspx
             [return: MarshalAs(UnmanagedType.Bool)]
-#if DOTNET5_4
+#if NETSTANDARD1_3
             [DllImport(CORE_LIBRARY_LOADER_LIB, EntryPoint = "GetModuleHandleExW", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
 #else
             [DllImport(KERNEL32_LIB, EntryPoint = "GetModuleHandleExW", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
@@ -178,7 +178,7 @@ namespace Microsoft.AspNetCore.Cryptography.SafeHandles
                 [Out] out IntPtr phModule);
 
             // http://msdn.microsoft.com/en-us/library/ms683212(v=vs.85).aspx
-#if DOTNET5_4
+#if NETSTANDARD1_3
             [DllImport(CORE_LIBRARY_LOADER_LIB, CallingConvention = CallingConvention.Winapi, SetLastError = true)]
 #else
             [DllImport(KERNEL32_LIB, CallingConvention = CallingConvention.Winapi, SetLastError = true)]
@@ -188,7 +188,7 @@ namespace Microsoft.AspNetCore.Cryptography.SafeHandles
                 [In, MarshalAs(UnmanagedType.LPStr)] string lpProcName);
 
             // http://msdn.microsoft.com/en-us/library/windows/desktop/ms684179(v=vs.85).aspx
-#if DOTNET5_4
+#if NETSTANDARD1_3
             [DllImport(CORE_LIBRARY_LOADER_LIB, EntryPoint = "LoadLibraryExW", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
 #else
             [DllImport(KERNEL32_LIB, EntryPoint = "LoadLibraryExW", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
diff --git a/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SecureLocalAllocHandle.cs b/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SecureLocalAllocHandle.cs
index 527c26d..9c7faee 100644
--- a/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SecureLocalAllocHandle.cs
+++ b/src/Microsoft.AspNetCore.Cryptography.Internal/SafeHandles/SecureLocalAllocHandle.cs
@@ -4,7 +4,7 @@
 using System;
 using System.Runtime.InteropServices;
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
 using System.Runtime.ConstrainedExecution;
 #endif
 
@@ -41,7 +41,7 @@ namespace Microsoft.AspNetCore.Cryptography.SafeHandles
             return newHandle;
         }
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
 #endif
         private void AllocateImpl(IntPtr cb)
diff --git a/src/Microsoft.AspNetCore.Cryptography.Internal/UnsafeBufferUtil.cs b/src/Microsoft.AspNetCore.Cryptography.Internal/UnsafeBufferUtil.cs
index 3645878..247812f 100644
--- a/src/Microsoft.AspNetCore.Cryptography.Internal/UnsafeBufferUtil.cs
+++ b/src/Microsoft.AspNetCore.Cryptography.Internal/UnsafeBufferUtil.cs
@@ -6,7 +6,7 @@ using System.Runtime.CompilerServices;
 using System.Threading;
 using Microsoft.AspNetCore.Cryptography.SafeHandles;
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
 using System.Runtime.ConstrainedExecution;
 #endif
 
@@ -15,7 +15,7 @@ namespace Microsoft.AspNetCore.Cryptography
     internal unsafe static class UnsafeBufferUtil
     {
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
 #endif
         public static void BlockCopy(void* from, void* to, int byteCount)
@@ -24,7 +24,7 @@ namespace Microsoft.AspNetCore.Cryptography
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
 #endif
         public static void BlockCopy(void* from, void* to, uint byteCount)
@@ -35,7 +35,7 @@ namespace Microsoft.AspNetCore.Cryptography
             }
         }
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
 #endif
         public static void BlockCopy(LocalAllocHandle from, void* to, uint byteCount)
@@ -55,7 +55,7 @@ namespace Microsoft.AspNetCore.Cryptography
             }
         }
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
 #endif
         public static void BlockCopy(void* from, LocalAllocHandle to, uint byteCount)
@@ -75,7 +75,7 @@ namespace Microsoft.AspNetCore.Cryptography
             }
         }
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
 #endif
         public static void BlockCopy(LocalAllocHandle from, LocalAllocHandle to, IntPtr length)
@@ -116,7 +116,7 @@ namespace Microsoft.AspNetCore.Cryptography
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         private static void BlockCopyCore(byte* from, byte* to, uint byteCount)
         {
-#if DOTNET5_4
+#if NETSTANDARD1_3
             Buffer.MemoryCopy(from, to, (ulong)byteCount, (ulong)byteCount);
 #else
             while (byteCount-- != 0)
@@ -129,7 +129,7 @@ namespace Microsoft.AspNetCore.Cryptography
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         private static void BlockCopyCore(byte* from, byte* to, ulong byteCount)
         {
-#if DOTNET5_4
+#if NETSTANDARD1_3
             Buffer.MemoryCopy(from, to, byteCount, byteCount);
 #else
             while (byteCount-- != 0)
@@ -143,7 +143,7 @@ namespace Microsoft.AspNetCore.Cryptography
         /// Securely clears a memory buffer.
         /// </summary>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
 #endif
         public static void SecureZeroMemory(byte* buffer, int byteCount)
@@ -155,7 +155,7 @@ namespace Microsoft.AspNetCore.Cryptography
         /// Securely clears a memory buffer.
         /// </summary>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
 #endif
         public static void SecureZeroMemory(byte* buffer, uint byteCount)
@@ -176,7 +176,7 @@ namespace Microsoft.AspNetCore.Cryptography
         /// Securely clears a memory buffer.
         /// </summary>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
 #endif
         public static void SecureZeroMemory(byte* buffer, ulong byteCount)
@@ -196,7 +196,7 @@ namespace Microsoft.AspNetCore.Cryptography
         /// <summary>
         /// Securely clears a memory buffer.
         /// </summary>
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
 #endif
         public static void SecureZeroMemory(byte* buffer, IntPtr length)
diff --git a/src/Microsoft.AspNetCore.Cryptography.Internal/UnsafeNativeMethods.cs b/src/Microsoft.AspNetCore.Cryptography.Internal/UnsafeNativeMethods.cs
index 1de8dbc..73cf4e9 100644
--- a/src/Microsoft.AspNetCore.Cryptography.Internal/UnsafeNativeMethods.cs
+++ b/src/Microsoft.AspNetCore.Cryptography.Internal/UnsafeNativeMethods.cs
@@ -12,13 +12,13 @@ using Microsoft.AspNetCore.Cryptography.Cng;
 using Microsoft.AspNetCore.Cryptography.SafeHandles;
 using Microsoft.Win32.SafeHandles;
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
 using System.Runtime.ConstrainedExecution;
 #endif
 
 namespace Microsoft.AspNetCore.Cryptography
 {
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
     [SuppressUnmanagedCodeSecurity]
 #endif
     internal unsafe static class UnsafeNativeMethods
@@ -87,7 +87,7 @@ namespace Microsoft.AspNetCore.Cryptography
             [In] uint dwFlags);
 
         [DllImport(BCRYPT_LIB, CallingConvention = CallingConvention.Winapi)]
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
 #endif
         // http://msdn.microsoft.com/en-us/library/windows/desktop/aa375399(v=vs.85).aspx
@@ -95,7 +95,7 @@ namespace Microsoft.AspNetCore.Cryptography
             [In] IntPtr hHash);
 
         [DllImport(BCRYPT_LIB, CallingConvention = CallingConvention.Winapi)]
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
 #endif
         // http://msdn.microsoft.com/en-us/library/windows/desktop/aa375404(v=vs.85).aspx
@@ -249,7 +249,7 @@ namespace Microsoft.AspNetCore.Cryptography
          */
 
         [DllImport(NCRYPT_LIB, CallingConvention = CallingConvention.Winapi)]
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
 #endif
         // http://msdn.microsoft.com/en-us/library/windows/desktop/hh706799(v=vs.85).aspx
diff --git a/src/Microsoft.AspNetCore.Cryptography.Internal/project.json b/src/Microsoft.AspNetCore.Cryptography.Internal/project.json
index 8c53951..ebd11d6 100644
--- a/src/Microsoft.AspNetCore.Cryptography.Internal/project.json
+++ b/src/Microsoft.AspNetCore.Cryptography.Internal/project.json
@@ -8,21 +8,26 @@
   "dependencies": {},
   "frameworks": {
     "net451": {},
-    "dotnet5.4": {
+    "netstandard1.3": {
       "dependencies": {
         "System.Diagnostics.Debug": "4.0.11-*",
         "System.Runtime.Handles": "4.0.1-*",
         "System.Runtime.InteropServices": "4.1.0-*",
         "System.Security.Cryptography.Primitives": "4.0.0-*",
         "System.Threading": "4.0.11-*"
-      }
+      },
+      "imports": [
+        "dotnet5.4"
+      ]
     }
   },
   "compilationOptions": {
     "allowUnsafe": true,
     "warningsAsErrors": true,
     "keyFile": "../../tools/Key.snk",
-    "nowarn": [ "CS1591" ],
+    "nowarn": [
+      "CS1591"
+    ],
     "xmlDoc": true
   }
-}
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNetCore.Cryptography.KeyDerivation/project.json b/src/Microsoft.AspNetCore.Cryptography.KeyDerivation/project.json
index 0f1ff14..1ba9922 100644
--- a/src/Microsoft.AspNetCore.Cryptography.KeyDerivation/project.json
+++ b/src/Microsoft.AspNetCore.Cryptography.KeyDerivation/project.json
@@ -10,19 +10,24 @@
   },
   "frameworks": {
     "net451": {},
-    "dotnet5.4": {
+    "netstandard1.3": {
       "dependencies": {
         "System.Runtime.Extensions": "4.1.0-*",
         "System.Security.Cryptography.Algorithms": "4.0.0-*",
         "System.Text.Encoding.Extensions": "4.0.11-*"
-      }
+      },
+      "imports": [
+        "dotnet5.4"
+      ]
     }
   },
   "compilationOptions": {
     "allowUnsafe": true,
     "warningsAsErrors": true,
     "keyFile": "../../tools/Key.snk",
-    "nowarn": [ "CS1591" ],
+    "nowarn": [
+      "CS1591"
+    ],
     "xmlDoc": true
   }
-}
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNetCore.DataProtection.Abstractions/project.json b/src/Microsoft.AspNetCore.DataProtection.Abstractions/project.json
index 3673818..eb8ade7 100644
--- a/src/Microsoft.AspNetCore.DataProtection.Abstractions/project.json
+++ b/src/Microsoft.AspNetCore.DataProtection.Abstractions/project.json
@@ -14,17 +14,22 @@
   },
   "frameworks": {
     "net451": {},
-    "dotnet5.4": {
+    "netstandard1.3": {
       "dependencies": {
         "System.ComponentModel": "4.0.1-*",
         "System.Diagnostics.Debug": "4.0.11-*"
-      }
+      },
+      "imports": [
+        "dotnet5.4"
+      ]
     }
   },
   "compilationOptions": {
     "warningsAsErrors": true,
     "keyFile": "../../tools/Key.snk",
-    "nowarn": [ "CS1591" ],
+    "nowarn": [
+      "CS1591"
+    ],
     "xmlDoc": true
   }
 }
\ No newline at end of file
diff --git a/src/Microsoft.AspNetCore.DataProtection.Extensions/project.json b/src/Microsoft.AspNetCore.DataProtection.Extensions/project.json
index cbdf080..14d7784 100644
--- a/src/Microsoft.AspNetCore.DataProtection.Extensions/project.json
+++ b/src/Microsoft.AspNetCore.DataProtection.Extensions/project.json
@@ -15,12 +15,18 @@
   },
   "frameworks": {
     "net451": {},
-    "dotnet5.4": {}
+    "netstandard1.3": {
+      "imports": [
+        "dotnet5.4"
+      ]
+    }
   },
   "compilationOptions": {
     "warningsAsErrors": true,
     "keyFile": "../../tools/Key.snk",
-    "nowarn": [ "CS1591" ],
+    "nowarn": [
+      "CS1591"
+    ],
     "xmlDoc": true
   }
 }
\ No newline at end of file
diff --git a/src/Microsoft.AspNetCore.DataProtection.Sources/project.json b/src/Microsoft.AspNetCore.DataProtection.Sources/project.json
index e04fdd4..b205184 100644
--- a/src/Microsoft.AspNetCore.DataProtection.Sources/project.json
+++ b/src/Microsoft.AspNetCore.DataProtection.Sources/project.json
@@ -8,11 +8,14 @@
   "dependencies": {},
   "frameworks": {
     "net451": {},
-    "dotnet5.4": {
+    "netstandard1.3": {
       "dependencies": {
         "System.Security.Cryptography.Primitives": "4.0.0-*",
         "System.Text.Encoding.Extensions": "4.0.11-*"
-      }
+      },
+      "imports": [
+        "dotnet5.4"
+      ]
     }
   },
   "shared": "**\\*.cs",
@@ -20,4 +23,4 @@
     "warningsAsErrors": true,
     "keyFile": "../../tools/Key.snk"
   }
-}
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNetCore.DataProtection/AuthenticatedEncryption/ManagedAuthenticatedEncryptionOptions.cs b/src/Microsoft.AspNetCore.DataProtection/AuthenticatedEncryption/ManagedAuthenticatedEncryptionOptions.cs
index 038680f..622e37d 100644
--- a/src/Microsoft.AspNetCore.DataProtection/AuthenticatedEncryption/ManagedAuthenticatedEncryptionOptions.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/AuthenticatedEncryption/ManagedAuthenticatedEncryptionOptions.cs
@@ -119,7 +119,7 @@ namespace Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption
             if (EncryptionAlgorithmType == typeof(Aes))
             {
                 Func<Aes> factory = null;
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
                 if (OSVersionUtil.IsWindows())
                 {
                     // If we're on desktop CLR and running on Windows, use the FIPS-compliant implementation.
diff --git a/src/Microsoft.AspNetCore.DataProtection/Cng/DpapiSecretSerializerHelper.cs b/src/Microsoft.AspNetCore.DataProtection/Cng/DpapiSecretSerializerHelper.cs
index 48e4ff4..ba0bd83 100644
--- a/src/Microsoft.AspNetCore.DataProtection/Cng/DpapiSecretSerializerHelper.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/Cng/DpapiSecretSerializerHelper.cs
@@ -78,7 +78,7 @@ namespace Microsoft.AspNetCore.DataProtection.Cng
             };
             DATA_BLOB dataOut = default(DATA_BLOB);
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
             RuntimeHelpers.PrepareConstrainedRegions();
 #endif
             try
@@ -168,7 +168,7 @@ namespace Microsoft.AspNetCore.DataProtection.Cng
                     fixed (byte* pbRetVal = retVal)
                     {
                         bool handleAcquired = false;
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
                         RuntimeHelpers.PrepareConstrainedRegions();
 #endif
                         try
@@ -218,7 +218,7 @@ namespace Microsoft.AspNetCore.DataProtection.Cng
             };
             DATA_BLOB dataOut = default(DATA_BLOB);
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
             RuntimeHelpers.PrepareConstrainedRegions();
 #endif
             try
@@ -291,7 +291,7 @@ namespace Microsoft.AspNetCore.DataProtection.Cng
             using (unencryptedPayloadHandle)
             {
                 bool handleAcquired = false;
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
                 RuntimeHelpers.PrepareConstrainedRegions();
 #endif
                 try
diff --git a/src/Microsoft.AspNetCore.DataProtection/DataProtectionConfiguration.cs b/src/Microsoft.AspNetCore.DataProtection/DataProtectionConfiguration.cs
index c9f4e8d..a71f59b 100644
--- a/src/Microsoft.AspNetCore.DataProtection/DataProtectionConfiguration.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/DataProtectionConfiguration.cs
@@ -11,13 +11,13 @@ using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Win32;
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
 using System.Security.Cryptography.X509Certificates;
 #endif
 
 namespace Microsoft.AspNetCore.DataProtection
 {
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
     /// <summary>
     /// Provides access to configuration for the data protection system, which allows the
     /// developer to configure default cryptographic algorithms, key storage locations,
@@ -209,7 +209,7 @@ namespace Microsoft.AspNetCore.DataProtection
             return this;
         }
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
 
         /// <summary>
         /// Configures keys to be encrypted to a given certificate before being persisted to storage.
diff --git a/src/Microsoft.AspNetCore.DataProtection/DataProtectionServiceDescriptors.cs b/src/Microsoft.AspNetCore.DataProtection/DataProtectionServiceDescriptors.cs
index d21e1e0..9c4b268 100644
--- a/src/Microsoft.AspNetCore.DataProtection/DataProtectionServiceDescriptors.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/DataProtectionServiceDescriptors.cs
@@ -13,7 +13,7 @@ using Microsoft.AspNetCore.DataProtection.XmlEncryption;
 using Microsoft.Extensions.Options;
 using Microsoft.Win32;
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
 using System.Security.Cryptography.X509Certificates;
 #endif
 
@@ -69,7 +69,7 @@ namespace Microsoft.Extensions.DependencyInjection
             return ServiceDescriptor.Singleton<IAuthenticatedEncryptorConfiguration>(options.ToConfiguration);
         }
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
         /// <summary>
         /// An <see cref="ICertificateResolver"/> backed by the default implementation.
         /// </summary>
@@ -118,7 +118,7 @@ namespace Microsoft.Extensions.DependencyInjection
             return ServiceDescriptor.Singleton<IKeyManager>(services => new XmlKeyManager(services));
         }
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
 
         /// <summary>
         /// An <see cref="IXmlEncryptor"/> backed by an X.509 certificate.
diff --git a/src/Microsoft.AspNetCore.DataProtection/DataProtectionServices.cs b/src/Microsoft.AspNetCore.DataProtection/DataProtectionServices.cs
index a76e46d..14c9bb9 100644
--- a/src/Microsoft.AspNetCore.DataProtection/DataProtectionServices.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/DataProtectionServices.cs
@@ -110,7 +110,7 @@ namespace Microsoft.Extensions.DependencyInjection
             yield return DataProtectionServiceDescriptors.IDataProtectionProvider_Default();
 
             // Provide services required for XML encryption
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
             yield return DataProtectionServiceDescriptors.ICertificateResolver_Default();
 #endif
 
diff --git a/src/Microsoft.AspNetCore.DataProtection/Managed/ManagedAuthenticatedEncryptor.cs b/src/Microsoft.AspNetCore.DataProtection/Managed/ManagedAuthenticatedEncryptor.cs
index b381eb0..b3190b8 100644
--- a/src/Microsoft.AspNetCore.DataProtection/Managed/ManagedAuthenticatedEncryptor.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/Managed/ManagedAuthenticatedEncryptor.cs
@@ -343,7 +343,7 @@ namespace Microsoft.AspNetCore.DataProtection.Managed
 
                             using (var validationAlgorithm = CreateValidationAlgorithm(validationSubkey))
                             {
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
                                 // As an optimization, avoid duplicating the underlying buffer if we're on desktop CLR.
                                 byte[] underlyingBuffer = outputStream.GetBuffer();
 #else
diff --git a/src/Microsoft.AspNetCore.DataProtection/Repositories/FileSystemXmlRepository.cs b/src/Microsoft.AspNetCore.DataProtection/Repositories/FileSystemXmlRepository.cs
index 6e2eb99..9969a8b 100644
--- a/src/Microsoft.AspNetCore.DataProtection/Repositories/FileSystemXmlRepository.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/Repositories/FileSystemXmlRepository.cs
@@ -101,7 +101,7 @@ namespace Microsoft.AspNetCore.DataProtection.Repositories
 
         private static DirectoryInfo GetDefaultKeyStorageDirectory()
         {
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
             // Environment.GetFolderPath returns null if the user profile isn't loaded.
             string folderPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
             if (!String.IsNullOrEmpty(folderPath))
diff --git a/src/Microsoft.AspNetCore.DataProtection/StringInterpolation.cs b/src/Microsoft.AspNetCore.DataProtection/StringInterpolation.cs
index 16f306b..cb6120c 100644
--- a/src/Microsoft.AspNetCore.DataProtection/StringInterpolation.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/StringInterpolation.cs
@@ -1,7 +1,7 @@
 // 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.
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
 // These classes allow using the C# string interpolation feature from .NET 4.5.1.
 // They're slimmed-down versions of the classes that exist in .NET 4.6.
 
diff --git a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/CertificateResolver.cs b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/CertificateResolver.cs
index 00f19f0..1116fd4 100644
--- a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/CertificateResolver.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/CertificateResolver.cs
@@ -1,7 +1,7 @@
 // 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.
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
 
 using System;
 using System.Security.Cryptography.X509Certificates;
diff --git a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/CertificateXmlEncryptor.cs b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/CertificateXmlEncryptor.cs
index 09c64ab..03c784c 100644
--- a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/CertificateXmlEncryptor.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/CertificateXmlEncryptor.cs
@@ -1,7 +1,7 @@
 // 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.
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
 
 using System;
 using System.Security.Cryptography.X509Certificates;
diff --git a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/EncryptedXmlDecryptor.core50.cs b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/EncryptedXmlDecryptor.core50.cs
index ac3edc0..565c30e 100644
--- a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/EncryptedXmlDecryptor.core50.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/EncryptedXmlDecryptor.core50.cs
@@ -1,7 +1,7 @@
 // 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.
 
-#if DOTNET5_4
+#if NETSTANDARD1_3
 // [[ISSUE60]] Remove this entire file when Core CLR gets support for EncryptedXml.
 // This is just a dummy implementation of the class that always throws.
 // The only reason it's here (albeit internal) is to provide a nice error message if key
diff --git a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/EncryptedXmlDecryptor.cs b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/EncryptedXmlDecryptor.cs
index 6a7d639..eb8d163 100644
--- a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/EncryptedXmlDecryptor.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/EncryptedXmlDecryptor.cs
@@ -1,7 +1,7 @@
 // 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.
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
 
 using System;
 using System.Security.Cryptography.Xml;
diff --git a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/ICertificateResolver.cs b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/ICertificateResolver.cs
index d87a1ec..9834687 100644
--- a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/ICertificateResolver.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/ICertificateResolver.cs
@@ -1,7 +1,7 @@
 // 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.
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
 
 using System.Security.Cryptography.X509Certificates;
 
diff --git a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/IInternalCertificateXmlEncryptor.cs b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/IInternalCertificateXmlEncryptor.cs
index 5507b68..1e3cfea 100644
--- a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/IInternalCertificateXmlEncryptor.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/IInternalCertificateXmlEncryptor.cs
@@ -1,7 +1,7 @@
 // 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.
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
 
 using System;
 using System.Xml;
diff --git a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/IInternalEncryptedXmlDecryptor.cs b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/IInternalEncryptedXmlDecryptor.cs
index b54bbcd..0bdf668 100644
--- a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/IInternalEncryptedXmlDecryptor.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/IInternalEncryptedXmlDecryptor.cs
@@ -1,7 +1,7 @@
 // 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.
 
-#if !DOTNET5_4 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
+#if !NETSTANDARD1_3 // [[ISSUE60]] Remove this #ifdef when Core CLR gets support for EncryptedXml
 
 using System;
 using System.Security.Cryptography.Xml;
diff --git a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/XmlEncryptionExtensions.cs b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/XmlEncryptionExtensions.cs
index 6505412..2d155ef 100644
--- a/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/XmlEncryptionExtensions.cs
+++ b/src/Microsoft.AspNetCore.DataProtection/XmlEncryption/XmlEncryptionExtensions.cs
@@ -133,7 +133,7 @@ namespace Microsoft.AspNetCore.DataProtection.XmlEncryption
             var memoryStream = new MemoryStream(DEFAULT_BUFFER_SIZE);
             element.Save(memoryStream);
 
-#if !DOTNET5_4
+#if !NETSTANDARD1_3
             byte[] underlyingBuffer = memoryStream.GetBuffer();
             fixed (byte* __unused__ = underlyingBuffer) // try to limit this moving around in memory while we allocate
             {
diff --git a/src/Microsoft.AspNetCore.DataProtection/project.json b/src/Microsoft.AspNetCore.DataProtection/project.json
index 9372a62..cd44733 100644
--- a/src/Microsoft.AspNetCore.DataProtection/project.json
+++ b/src/Microsoft.AspNetCore.DataProtection/project.json
@@ -25,21 +25,26 @@
         "System.Xml.Linq": ""
       }
     },
-    "dotnet5.4": {
+    "netstandard1.3": {
       "dependencies": {
         "Microsoft.Win32.Registry": "4.0.0-*",
         "System.Security.Cryptography.X509Certificates": "4.0.0-*",
         "System.Security.Claims": "4.0.1-*",
         "System.Security.Principal.Windows": "4.0.0-*",
         "System.Xml.XDocument": "4.0.11-*"
-      }
+      },
+      "imports": [
+        "dotnet5.4"
+      ]
     }
   },
   "compilationOptions": {
     "allowUnsafe": true,
     "warningsAsErrors": true,
     "keyFile": "../../tools/Key.snk",
-    "nowarn": [ "CS1591" ],
+    "nowarn": [
+      "CS1591"
+    ],
     "xmlDoc": true
   }
 }
\ No newline at end of file
diff --git a/test/Microsoft.AspNetCore.Cryptography.Internal.Test/project.json b/test/Microsoft.AspNetCore.Cryptography.Internal.Test/project.json
index 308877a..ffa391f 100644
--- a/test/Microsoft.AspNetCore.Cryptography.Internal.Test/project.json
+++ b/test/Microsoft.AspNetCore.Cryptography.Internal.Test/project.json
@@ -10,11 +10,14 @@
     "xunit": "2.1.0"
   },
   "frameworks": {
-    "dnxcore50": {
+    "netstandardapp1.5": {
       "dependencies": {
         "dotnet-test-xunit": "1.0.0-dev-*"
       },
-      "imports": "portable-net451+win8"
+      "imports": [
+        "dnxcore50",
+        "portable-net451+win8"
+      ]
     },
     "net451": {
       "dependencies": {
diff --git a/test/Microsoft.AspNetCore.Cryptography.KeyDerivation.Test/project.json b/test/Microsoft.AspNetCore.Cryptography.KeyDerivation.Test/project.json
index 4263161..b6446be 100644
--- a/test/Microsoft.AspNetCore.Cryptography.KeyDerivation.Test/project.json
+++ b/test/Microsoft.AspNetCore.Cryptography.KeyDerivation.Test/project.json
@@ -8,11 +8,14 @@
     "xunit": "2.1.0"
   },
   "frameworks": {
-    "dnxcore50": {
+    "netstandardapp1.5": {
       "dependencies": {
         "dotnet-test-xunit": "1.0.0-dev-*"
       },
-      "imports": "portable-net451+win8"
+      "imports": [
+        "dnxcore50",
+        "portable-net451+win8"
+      ]
     },
     "net451": {
       "dependencies": {
diff --git a/test/Microsoft.AspNetCore.DataProtection.Abstractions.Test/project.json b/test/Microsoft.AspNetCore.DataProtection.Abstractions.Test/project.json
index 0c2f5f6..f0676e9 100644
--- a/test/Microsoft.AspNetCore.DataProtection.Abstractions.Test/project.json
+++ b/test/Microsoft.AspNetCore.DataProtection.Abstractions.Test/project.json
@@ -7,12 +7,15 @@
     "xunit": "2.1.0"
   },
   "frameworks": {
-    "dnxcore50": {
+    "netstandardapp1.5": {
       "dependencies": {
         "moq.netcore": "4.4.0-beta8",
         "dotnet-test-xunit": "1.0.0-dev-*"
       },
-      "imports": "portable-net451+win8"
+      "imports": [
+        "dnxcore50",
+        "portable-net451+win8"
+      ]
     },
     "net451": {
       "dependencies": {
diff --git a/test/Microsoft.AspNetCore.DataProtection.Extensions.Test/project.json b/test/Microsoft.AspNetCore.DataProtection.Extensions.Test/project.json
index f892ec3..d5fddc8 100644
--- a/test/Microsoft.AspNetCore.DataProtection.Extensions.Test/project.json
+++ b/test/Microsoft.AspNetCore.DataProtection.Extensions.Test/project.json
@@ -11,12 +11,15 @@
     "xunit": "2.1.0"
   },
   "frameworks": {
-    "dnxcore50": {
+    "netstandardapp1.5": {
       "dependencies": {
         "moq.netcore": "4.4.0-beta8",
         "dotnet-test-xunit": "1.0.0-dev-*"
       },
-      "imports": "portable-net451+win8"
+      "imports": [
+        "dnxcore50",
+        "portable-net451+win8"
+      ]
     },
     "net451": {
       "dependencies": {
diff --git a/test/Microsoft.AspNetCore.DataProtection.Test.Shared/project.json b/test/Microsoft.AspNetCore.DataProtection.Test.Shared/project.json
index 69ab8c7..fbbb894 100644
--- a/test/Microsoft.AspNetCore.DataProtection.Test.Shared/project.json
+++ b/test/Microsoft.AspNetCore.DataProtection.Test.Shared/project.json
@@ -1,11 +1,14 @@
 {
   "frameworks": {
-    "dnxcore50": {
+    "netstandardapp1.5": {
       "dependencies": {
         "dotnet-test-xunit": "1.0.0-dev-*",
         "Microsoft.NETCore.Platforms": "1.0.1-*"
       },
-      "imports": "portable-net451+win8"
+      "imports": [
+        "dnxcore50",
+        "portable-net451+win8"
+      ]
     },
     "net451": {}
   },
diff --git a/test/Microsoft.AspNetCore.DataProtection.Test/Repositories/FileSystemXmlRepositoryTests.cs b/test/Microsoft.AspNetCore.DataProtection.Test/Repositories/FileSystemXmlRepositoryTests.cs
index 236f98c..2ed3f84 100644
--- a/test/Microsoft.AspNetCore.DataProtection.Test/Repositories/FileSystemXmlRepositoryTests.cs
+++ b/test/Microsoft.AspNetCore.DataProtection.Test/Repositories/FileSystemXmlRepositoryTests.cs
@@ -158,7 +158,7 @@ namespace Microsoft.AspNetCore.DataProtection.Repositories
 
         private static string GetLocalApplicationData()
         {
-#if DNXCORE50
+#if NETSTANDARDAPP1_5
             return Environment.GetEnvironmentVariable("LOCALAPPDATA");
 #else
             return Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
diff --git a/test/Microsoft.AspNetCore.DataProtection.Test/XmlEncryption/CertificateXmlEncryptionTests.cs b/test/Microsoft.AspNetCore.DataProtection.Test/XmlEncryption/CertificateXmlEncryptionTests.cs
index 79e2b2d..4655d87 100644
--- a/test/Microsoft.AspNetCore.DataProtection.Test/XmlEncryption/CertificateXmlEncryptionTests.cs
+++ b/test/Microsoft.AspNetCore.DataProtection.Test/XmlEncryption/CertificateXmlEncryptionTests.cs
@@ -1,7 +1,7 @@
 // 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.
 
-#if !DNXCORE50
+#if !NETSTANDARDAPP1_5
 using System;
 using System.Security.Cryptography;
 using System.Security.Cryptography.Xml;
diff --git a/test/Microsoft.AspNetCore.DataProtection.Test/XmlEncryption/DpapiXmlEncryptionTests.cs b/test/Microsoft.AspNetCore.DataProtection.Test/XmlEncryption/DpapiXmlEncryptionTests.cs
index 8929ae9..775c63b 100644
--- a/test/Microsoft.AspNetCore.DataProtection.Test/XmlEncryption/DpapiXmlEncryptionTests.cs
+++ b/test/Microsoft.AspNetCore.DataProtection.Test/XmlEncryption/DpapiXmlEncryptionTests.cs
@@ -33,7 +33,7 @@ namespace Microsoft.AspNetCore.DataProtection.XmlEncryption
             XmlAssert.Equal(originalXml, roundTrippedElement);
         }
 
-#if !DNXCORE50
+#if !NETSTANDARDAPP1_5
         [ConditionalFact]
         [ConditionalRunTestOnlyOnWindows]
         public void Encrypt_CurrentUser_Decrypt_ImpersonatedAsAnonymous_Fails()
diff --git a/test/Microsoft.AspNetCore.DataProtection.Test/project.json b/test/Microsoft.AspNetCore.DataProtection.Test/project.json
index 5622521..9897b9b 100644
--- a/test/Microsoft.AspNetCore.DataProtection.Test/project.json
+++ b/test/Microsoft.AspNetCore.DataProtection.Test/project.json
@@ -11,12 +11,15 @@
     "xunit": "2.1.0"
   },
   "frameworks": {
-    "dnxcore50": {
+    "netstandardapp1.5": {
       "dependencies": {
         "moq.netcore": "4.4.0-beta8",
         "dotnet-test-xunit": "1.0.0-dev-*"
       },
-      "imports": "portable-net451+win8"
+      "imports": [
+        "dnxcore50",
+        "portable-net451+win8"
+      ]
     },
     "net451": {
       "dependencies": {