fix(certificado): remove warning substituindo PrivateKey por GetRSAPrivateKey()

Author: Valmir-Cunha

DFe.Utils/Assinatura/AssinaturaDigital.cs

@@ -57,7 +57,7 @@ public static SignatureZeus Assina<T>(T objeto, string id, X509Certificate2 cert
                 ? FuncoesXml.ClasseParaXmlString(objetoLocal).RemoverAcentos()
                 : FuncoesXml.ClasseParaXmlString(objetoLocal));
 
-            var docXml = new SignedXml(documento) { SigningKey = certificado.PrivateKey };
+            var docXml = new SignedXml(documento) { SigningKey = certificado.GetRSAPrivateKey() };
 
             docXml.SignedInfo.SignatureMethod = signatureMethod;
             var reference = new Reference { Uri = "#" + id, DigestMethod = digestMethod };

DFe.Utils/Assinatura/CertificadoDigital.cs

@@ -153,7 +153,7 @@ private static void DefinirPinParaChavePrivada(this X509Certificate2 certificado
             if (Environment.OSVersion.Platform == PlatformID.Win32NT || Environment.OSVersion.Platform == PlatformID.Win32Windows || Environment.OSVersion.Platform == PlatformID.Win32S)
             {
                 if (certificado == null) throw new ArgumentNullException("certificado");
-                var key = (RSACryptoServiceProvider)certificado.PrivateKey;
+                var key = (RSACryptoServiceProvider)certificado.GetRSAPrivateKey();
 
                 var providerHandle = IntPtr.Zero;
                 var pinBuffer = Encoding.ASCII.GetBytes(pin);
@@ -338,7 +338,7 @@ public static bool IsA3(this X509Certificate2 x509Certificate2)
 
                 try
                 {
-                    RSACryptoServiceProvider service = x509Certificate2.PrivateKey as RSACryptoServiceProvider;
+                    RSACryptoServiceProvider service = x509Certificate2.GetRSAPrivateKey() as RSACryptoServiceProvider;
 
                     if (service != null)
                     {

NFe.Utils/Assinatura/Assinador.cs

@@ -97,7 +97,7 @@ public static Signature ObterAssinatura<T>(T objeto, string id, X509Certificate2
 
                 documento.LoadXml(xml);
 
-                var docXml = new SignedXml(documento) { SigningKey = certificadoDigital.PrivateKey };
+                var docXml = new SignedXml(documento) { SigningKey = certificadoDigital.GetRSAPrivateKey() };
 
                 docXml.SignedInfo.SignatureMethod = signatureMethod;