Cleanups

Author: javiercn

src/Servers/Kestrel/Core/src/Middleware/HttpsConnectionMiddleware.cs

@@ -8,7 +8,6 @@
 using System.Net.Security;
 using System.Runtime.InteropServices;
 using System.Security.Authentication;
-using System.Security.Cryptography;
 using System.Security.Cryptography.X509Certificates;
 using System.Threading;
 using System.Threading.Tasks;

src/Shared/CertificateGeneration/CertificateManager.cs

@@ -259,7 +259,9 @@ internal static bool CheckDeveloperCertificateKey(X509Certificate2 candidate)
                 // with the certificate at some point.
                 var value = new byte[32];
                 RandomNumberGenerator.Fill(value);
-                rsa.Encrypt(value, RSAEncryptionPadding.Pkcs1);
+                rsa.Decrypt(rsa.Encrypt(value, RSAEncryptionPadding.Pkcs1), RSAEncryptionPadding.Pkcs1);
+
+                // Being able to encrypt and decrypt a payload is the strongest guarantee that the key is valid.
                 return true;
             }
             catch (Exception)