diff --git a/src/libraries/Common/src/Interop/Windows/BCrypt/Interop.BCryptChainingModes.cs b/src/libraries/Common/src/Interop/Windows/BCrypt/Interop.BCryptChainingModes.cs
deleted file mode 100644
index 4a5b7df46c67d..0000000000000
--- a/src/libraries/Common/src/Interop/Windows/BCrypt/Interop.BCryptChainingModes.cs
+++ /dev/null
@@ -1,16 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-using System;
-using System.Diagnostics;
-using System.Runtime.InteropServices;
-
-internal static partial class Interop
-{
-    internal static partial class BCrypt
-    {
-        internal const string BCRYPT_CHAIN_MODE_CBC = "ChainingModeCBC";
-        internal const string BCRYPT_CHAIN_MODE_ECB = "ChainingModeECB";
-        internal const string BCRYPT_CHAIN_MODE_CFB = "ChainingModeCFB";
-    }
-}
diff --git a/src/libraries/Common/src/Interop/Windows/BCrypt/Interop.BCryptKeyDataBlob.cs b/src/libraries/Common/src/Interop/Windows/BCrypt/Interop.BCryptKeyDataBlob.cs
deleted file mode 100644
index 10b6b905ee62a..0000000000000
--- a/src/libraries/Common/src/Interop/Windows/BCrypt/Interop.BCryptKeyDataBlob.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-using System;
-using System.Diagnostics;
-using System.Runtime.InteropServices;
-
-internal static partial class Interop
-{
-    internal static partial class BCrypt
-    {
-        internal const int BCRYPT_KEY_DATA_BLOB_MAGIC = 0x4d42444b; // 'KDBM'
-        internal const int BCRYPT_KEY_DATA_BLOB_VERSION1 = 1;
-    }
-}
diff --git a/src/libraries/Common/src/Interop/Windows/NCrypt/Interop.NCryptAlgorithms.cs b/src/libraries/Common/src/Interop/Windows/NCrypt/Interop.NCryptAlgorithms.cs
deleted file mode 100644
index 22ca92d254c5d..0000000000000
--- a/src/libraries/Common/src/Interop/Windows/NCrypt/Interop.NCryptAlgorithms.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-using System;
-
-internal static partial class Interop
-{
-    internal static partial class NCrypt
-    {
-        internal const string NCRYPT_3DES_ALGORITHM = "3DES";
-        internal const string NCRYPT_AES_ALGORITHM = "AES";
-    }
-}
diff --git a/src/libraries/Common/src/Interop/Windows/NCrypt/Interop.NCryptCipherKeyBlob.cs b/src/libraries/Common/src/Interop/Windows/NCrypt/Interop.NCryptCipherKeyBlob.cs
deleted file mode 100644
index 68c1561bae603..0000000000000
--- a/src/libraries/Common/src/Interop/Windows/NCrypt/Interop.NCryptCipherKeyBlob.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-using System;
-
-internal static partial class Interop
-{
-    internal static partial class NCrypt
-    {
-        internal const string NCRYPT_CIPHER_KEY_BLOB = "CipherKeyBlob";
-        internal const int NCRYPT_CIPHER_KEY_BLOB_MAGIC = 0x52485043;  //'CPHR'
-    }
-}
diff --git a/src/libraries/Common/src/Interop/Windows/NCrypt/Interop.NCryptPropertyNames.cs b/src/libraries/Common/src/Interop/Windows/NCrypt/Interop.NCryptPropertyNames.cs
deleted file mode 100644
index 1c20f73651307..0000000000000
--- a/src/libraries/Common/src/Interop/Windows/NCrypt/Interop.NCryptPropertyNames.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-using System;
-
-internal static partial class Interop
-{
-    internal static partial class NCrypt
-    {
-        internal const string NCRYPT_CHAINING_MODE_PROPERTY = "Chaining Mode";
-        internal const string NCRYPT_INITIALIZATION_VECTOR = "IV";
-    }
-}
diff --git a/src/libraries/Common/src/System/Security/Cryptography/ECDiffieHellmanSecurityTransforms.macOS.cs b/src/libraries/Common/src/System/Security/Cryptography/ECDiffieHellmanSecurityTransforms.macOS.cs
deleted file mode 100644
index ae92c6b48f6e2..0000000000000
--- a/src/libraries/Common/src/System/Security/Cryptography/ECDiffieHellmanSecurityTransforms.macOS.cs
+++ /dev/null
@@ -1,21 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-using System.Diagnostics;
-using System.Security.Cryptography.Apple;
-
-namespace System.Security.Cryptography
-{
-    internal static partial class ECDiffieHellmanImplementation
-    {
-        public sealed partial class ECDiffieHellmanSecurityTransforms : ECDiffieHellman
-        {
-            public override void ImportSubjectPublicKeyInfo(
-                ReadOnlySpan<byte> source,
-                out int bytesRead)
-            {
-                KeySizeValue = _ecc.ImportSubjectPublicKeyInfo(source, out bytesRead);
-            }
-        }
-    }
-}