Add workaround for Windows 10 (1903) bug to RSABCrypt

Author: filipnavara

src/libraries/Common/src/Interop/Windows/BCrypt/Interop.BCryptEncryptDecrypt.RSA.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Runtime.InteropServices;
+using System.Security.Cryptography;
 
 using Microsoft.Win32.SafeHandles;
 
@@ -117,6 +118,14 @@ private static unsafe bool BCryptDecryptRsa(
                     dwFlags);
             }
 
+            // Windows 10.1903 can return success when it meant NTE_BUFFER_TOO_SMALL.
+            if (status == NTSTATUS.STATUS_SUCCESS && written > destination.Length)
+            {
+                CryptographicOperations.ZeroMemory(destination);
+                bytesWritten = 0;
+                return false;
+            }
+
             if (status == NTSTATUS.STATUS_SUCCESS)
             {
                 bytesWritten = written;