1 files changed, 6 insertions, 16 deletions
diff --git a/crypto/src/x509/AttributeCertificateIssuer.cs b/crypto/src/x509/AttributeCertificateIssuer.cs
index 32f16c23e..799a48877 100644
--- a/crypto/src/x509/AttributeCertificateIssuer.cs
+++ b/crypto/src/x509/AttributeCertificateIssuer.cs
@@ -2,7 +2,7 @@ using System;
 
 using Org.BouncyCastle.Asn1;
 using Org.BouncyCastle.Asn1.X509;
-using Org.BouncyCastle.X509.Store;
+using Org.BouncyCastle.Utilities.Collections;
 
 namespace Org.BouncyCastle.X509
 {
@@ -11,7 +11,7 @@ namespace Org.BouncyCastle.X509
 	 */
 	public class AttributeCertificateIssuer
 		//: CertSelector, Selector
-		: IX509Selector
+		: ISelector<X509Certificate>
 	{
 		internal readonly Asn1Encodable form;
 
@@ -132,9 +132,11 @@ namespace Org.BouncyCastle.X509
 			return new AttributeCertificateIssuer(AttCertIssuer.GetInstance(form));
 		}
 
-		public bool Match(
-			X509Certificate x509Cert)
+		public bool Match(X509Certificate x509Cert)
 		{
+			if (x509Cert == null)
+				return false;
+
 			if (form is V2Form)
 			{
 				V2Form issuer = (V2Form) form;
@@ -172,17 +174,5 @@ namespace Org.BouncyCastle.X509
 		{
 			return this.form.GetHashCode();
 		}
-
-		public bool Match(
-			object obj)
-		{
-			if (!(obj is X509Certificate))
-			{
-				return false;
-			}
-
-			//return Match((Certificate)obj);
-			return Match((X509Certificate)obj);
-		}
 	}
 }