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-rw-r--r--crypto/src/cms/CMSEnvelopedHelper.cs16
-rw-r--r--crypto/src/cms/CMSSignedDataStreamGenerator.cs4
-rw-r--r--crypto/src/cms/CMSSignedHelper.cs7
-rw-r--r--crypto/src/cms/KeyAgreeRecipientInformation.cs4
-rw-r--r--crypto/src/cms/RecipientInformation.cs6
-rw-r--r--crypto/src/cms/SignerInformation.cs10
6 files changed, 18 insertions, 29 deletions
diff --git a/crypto/src/cms/CMSEnvelopedHelper.cs b/crypto/src/cms/CMSEnvelopedHelper.cs
index 91f5ab910..86baa3642 100644
--- a/crypto/src/cms/CMSEnvelopedHelper.cs
+++ b/crypto/src/cms/CMSEnvelopedHelper.cs
@@ -114,21 +114,21 @@ namespace Org.BouncyCastle.Cms
 			CmsSecureReadable secureReadable)
 		{
 			Asn1Encodable recipInfo = info.Info;
-			if (recipInfo is KeyTransRecipientInfo)
+			if (recipInfo is KeyTransRecipientInfo keyTransRecipientInfo)
 			{
-				infos.Add(new KeyTransRecipientInformation((KeyTransRecipientInfo)recipInfo, secureReadable));
+				infos.Add(new KeyTransRecipientInformation(keyTransRecipientInfo, secureReadable));
 			}
-			else if (recipInfo is KekRecipientInfo)
+			else if (recipInfo is KekRecipientInfo kekRecipientInfo)
 			{
-				infos.Add(new KekRecipientInformation((KekRecipientInfo)recipInfo, secureReadable));
+				infos.Add(new KekRecipientInformation(kekRecipientInfo, secureReadable));
 			}
-			else if (recipInfo is KeyAgreeRecipientInfo)
+			else if (recipInfo is KeyAgreeRecipientInfo keyAgreeRecipientInfo)
 			{
-				KeyAgreeRecipientInformation.ReadRecipientInfo(infos, (KeyAgreeRecipientInfo)recipInfo, secureReadable);
+				KeyAgreeRecipientInformation.ReadRecipientInfo(infos, keyAgreeRecipientInfo, secureReadable);
 			}
-			else if (recipInfo is PasswordRecipientInfo)
+			else if (recipInfo is PasswordRecipientInfo passwordRecipientInfo)
 			{
-				infos.Add(new PasswordRecipientInformation((PasswordRecipientInfo)recipInfo, secureReadable));
+				infos.Add(new PasswordRecipientInformation(passwordRecipientInfo, secureReadable));
 			}
 		}
 
diff --git a/crypto/src/cms/CMSSignedDataStreamGenerator.cs b/crypto/src/cms/CMSSignedDataStreamGenerator.cs
index 69427c246..96200fc8c 100644
--- a/crypto/src/cms/CMSSignedDataStreamGenerator.cs
+++ b/crypto/src/cms/CMSSignedDataStreamGenerator.cs
@@ -660,10 +660,8 @@ namespace Org.BouncyCastle.Cms
 			{
 				foreach (object obj in _certs)
 				{
-					if (obj is Asn1TaggedObject)
+					if (obj is Asn1TaggedObject tagged)
 					{
-						Asn1TaggedObject tagged = (Asn1TaggedObject) obj;
-
 						if (tagged.TagNo == 1)
 						{
 							attrCertV1Found = true;
diff --git a/crypto/src/cms/CMSSignedHelper.cs b/crypto/src/cms/CMSSignedHelper.cs
index 0aced112e..0ab7790d1 100644
--- a/crypto/src/cms/CMSSignedHelper.cs
+++ b/crypto/src/cms/CMSSignedHelper.cs
@@ -210,9 +210,9 @@ namespace Org.BouncyCastle.Cms
         {
             string encOID = null;
 
-            if (key is RsaKeyParameters)
+            if (key is RsaKeyParameters rsaKeyParameters)
             {
-                if (!((RsaKeyParameters)key).IsPrivate)
+                if (!rsaKeyParameters.IsPrivate)
                     throw new ArgumentException("Expected RSA private key");
 
                 encOID = CmsSignedGenerator.EncryptionRsa;
@@ -244,9 +244,8 @@ namespace Org.BouncyCastle.Cms
                     throw new ArgumentException("can't mix DSA with anything but SHA1/SHA2");
                 }
             }
-            else if (key is ECPrivateKeyParameters)
+            else if (key is ECPrivateKeyParameters ecPrivKey)
             {
-                ECPrivateKeyParameters ecPrivKey = (ECPrivateKeyParameters)key;
                 string algName = ecPrivKey.AlgorithmName;
 
                 if (algName == "ECGOST3410")
diff --git a/crypto/src/cms/KeyAgreeRecipientInformation.cs b/crypto/src/cms/KeyAgreeRecipientInformation.cs
index 8843ede0d..398082810 100644
--- a/crypto/src/cms/KeyAgreeRecipientInformation.cs
+++ b/crypto/src/cms/KeyAgreeRecipientInformation.cs
@@ -208,11 +208,9 @@ namespace Org.BouncyCastle.Cms
         public override CmsTypedStream GetContentStream(
             ICipherParameters key)
         {
-            if (!(key is AsymmetricKeyParameter))
+            if (!(key is AsymmetricKeyParameter receiverPrivateKey))
                 throw new ArgumentException("KeyAgreement requires asymmetric key", "key");
 
-            AsymmetricKeyParameter receiverPrivateKey = (AsymmetricKeyParameter) key;
-
             if (!receiverPrivateKey.IsPrivate)
                 throw new ArgumentException("Expected private key", "key");
 
diff --git a/crypto/src/cms/RecipientInformation.cs b/crypto/src/cms/RecipientInformation.cs
index 272b841f2..978962711 100644
--- a/crypto/src/cms/RecipientInformation.cs
+++ b/crypto/src/cms/RecipientInformation.cs
@@ -112,15 +112,15 @@ namespace Org.BouncyCastle.Cms
 			if (resultMac == null)
 			{
 				object cryptoObject = secureReadable.CryptoObject;
-				if (cryptoObject is IMac)
+				if (cryptoObject is IMac mac)
 				{
-					resultMac = MacUtilities.DoFinal((IMac)cryptoObject);
+					resultMac = MacUtilities.DoFinal(mac);
 				}
 			}
 
 			return Arrays.Clone(resultMac);
 		}
-		
+
 		public abstract CmsTypedStream GetContentStream(ICipherParameters key);
 	}
 }
diff --git a/crypto/src/cms/SignerInformation.cs b/crypto/src/cms/SignerInformation.cs
index 551d9b737..99d300121 100644
--- a/crypto/src/cms/SignerInformation.cs
+++ b/crypto/src/cms/SignerInformation.cs
@@ -433,11 +433,9 @@ namespace Org.BouncyCastle.Cms
 					if (isCounterSignature)
 						throw new CmsException("[For counter signatures,] the signedAttributes field MUST NOT contain a content-type attribute");
 
-					if (!(validContentType is DerObjectIdentifier))
+					if (!(validContentType is DerObjectIdentifier signedContentType))
 						throw new CmsException("content-type attribute value not of ASN.1 type 'OBJECT IDENTIFIER'");
 
-					DerObjectIdentifier signedContentType = (DerObjectIdentifier)validContentType;
-
 					if (!signedContentType.Equals(contentType))
 						throw new CmsException("content-type attribute value does not match eContentType");
 				}
@@ -454,12 +452,8 @@ namespace Org.BouncyCastle.Cms
 				}
 				else
 				{
-					if (!(validMessageDigest is Asn1OctetString))
-					{
+					if (!(validMessageDigest is Asn1OctetString signedMessageDigest))
 						throw new CmsException("message-digest attribute value not of ASN.1 type 'OCTET STRING'");
-					}
-
-					Asn1OctetString signedMessageDigest = (Asn1OctetString)validMessageDigest;
 
 					if (!Arrays.AreEqual(resultDigest, signedMessageDigest.GetOctets()))
 						throw new CmsException("message-digest attribute value does not match calculated value");