2 files changed, 25 insertions, 27 deletions
diff --git a/crypto/src/openssl/MiscPemGenerator.cs b/crypto/src/openssl/MiscPemGenerator.cs
index d875f49c1..3db299569 100644
--- a/crypto/src/openssl/MiscPemGenerator.cs
+++ b/crypto/src/openssl/MiscPemGenerator.cs
@@ -26,10 +26,10 @@ namespace Org.BouncyCastle.OpenSsl
     public class MiscPemGenerator
         : PemObjectGenerator
     {
-        private object obj;
-        private string algorithm;
-        private char[] password;
-        private SecureRandom random;
+        private readonly object obj;
+        private readonly string algorithm;
+        private readonly char[] password;
+        private readonly SecureRandom random;
 
         public MiscPemGenerator(object obj)
         {
@@ -53,48 +53,47 @@ namespace Org.BouncyCastle.OpenSsl
             if (obj == null)
                 throw new ArgumentNullException("obj");
 
-            if (obj is AsymmetricCipherKeyPair)
+            if (obj is AsymmetricCipherKeyPair keyPair)
             {
-                return CreatePemObject(((AsymmetricCipherKeyPair)obj).Private);
+                return CreatePemObject(keyPair.Private);
             }
 
             string type;
             byte[] encoding;
 
-            if (obj is PemObject)
-                return (PemObject)obj;
+            if (obj is PemObject pemObject)
+                return pemObject;
 
-            if (obj is PemObjectGenerator)
-                return ((PemObjectGenerator)obj).Generate();
+            if (obj is PemObjectGenerator pemObjectGenerator)
+                return pemObjectGenerator.Generate();
 
-            if (obj is X509Certificate)
+            if (obj is X509Certificate certificate)
             {
                 // TODO Should we prefer "X509 CERTIFICATE" here?
                 type = "CERTIFICATE";
                 try
                 {
-                    encoding = ((X509Certificate)obj).GetEncoded();
+                    encoding = certificate.GetEncoded();
                 }
                 catch (CertificateEncodingException e)
                 {
                     throw new IOException("Cannot Encode object: " + e.ToString());
                 }
             }
-            else if (obj is X509Crl)
+            else if (obj is X509Crl crl)
             {
                 type = "X509 CRL";
                 try
                 {
-                    encoding = ((X509Crl)obj).GetEncoded();
+                    encoding = crl.GetEncoded();
                 }
                 catch (CrlException e)
                 {
                     throw new IOException("Cannot Encode object: " + e.ToString());
                 }
             }
-            else if (obj is AsymmetricKeyParameter)
+            else if (obj is AsymmetricKeyParameter akp)
             {
-                AsymmetricKeyParameter akp = (AsymmetricKeyParameter) obj;
                 if (akp.IsPrivate)
                 {
                     encoding = EncodePrivateKey(akp, out type);
@@ -106,20 +105,20 @@ namespace Org.BouncyCastle.OpenSsl
                     encoding = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(akp).GetDerEncoded();
                 }
             }
-            else if (obj is IX509AttributeCertificate)
+            else if (obj is X509V2AttributeCertificate attrCert)
             {
                 type = "ATTRIBUTE CERTIFICATE";
-                encoding = ((X509V2AttributeCertificate)obj).GetEncoded();
+                encoding = attrCert.GetEncoded();
             }
-            else if (obj is Pkcs10CertificationRequest)
+            else if (obj is Pkcs10CertificationRequest certReq)
             {
                 type = "CERTIFICATE REQUEST";
-                encoding = ((Pkcs10CertificationRequest)obj).GetEncoded();
+                encoding = certReq.GetEncoded();
             }
-            else if (obj is Asn1.Cms.ContentInfo)
+            else if (obj is Asn1.Cms.ContentInfo contentInfo)
             {
                 type = "PKCS7";
-                encoding = ((Asn1.Cms.ContentInfo)obj).GetEncoded();
+                encoding = contentInfo.GetEncoded();
             }
             else
             {
@@ -158,17 +157,16 @@ namespace Org.BouncyCastle.OpenSsl
             if (random == null)
                 throw new ArgumentNullException("random");
 
-            if (obj is AsymmetricCipherKeyPair)
+            if (obj is AsymmetricCipherKeyPair keyPair)
             {
-                return CreatePemObject(((AsymmetricCipherKeyPair)obj).Private, algorithm, password, random);
+                return CreatePemObject(keyPair.Private, algorithm, password, random);
             }
 
             string type = null;
             byte[] keyData = null;
 
-            if (obj is AsymmetricKeyParameter)
+            if (obj is AsymmetricKeyParameter akp)
             {
-                AsymmetricKeyParameter akp = (AsymmetricKeyParameter) obj;
                 if (akp.IsPrivate)
                 {
                     keyData = EncodePrivateKey(akp, out type);
diff --git a/crypto/src/openssl/PEMReader.cs b/crypto/src/openssl/PEMReader.cs
index 65d3f5ad6..5b4e37035 100644
--- a/crypto/src/openssl/PEMReader.cs
+++ b/crypto/src/openssl/PEMReader.cs
@@ -199,7 +199,7 @@ namespace Org.BouncyCastle.OpenSsl
         * @return the X509 Attribute Certificate
         * @throws IOException if an I/O error occured
         */
-        private IX509AttributeCertificate ReadAttributeCertificate(PemObject pemObject)
+        private X509V2AttributeCertificate ReadAttributeCertificate(PemObject pemObject)
         {
             return new X509V2AttributeCertificate(pemObject.Content);
         }