1 files changed, 33 insertions, 45 deletions

diff --git a/crypto/src/asn1/esf/CrlListID.cs b/crypto/src/asn1/esf/CrlListID.cs
index 1ee58aebc..ef49f9f4f 100644
--- a/crypto/src/asn1/esf/CrlListID.cs
+++ b/crypto/src/asn1/esf/CrlListID.cs
@@ -1,50 +1,44 @@
 using System;
 using System.Collections.Generic;
 
-using Org.BouncyCastle.Utilities;
-
 namespace Org.BouncyCastle.Asn1.Esf
 {
-	/// <remarks>
-	/// RFC 3126: 4.2.2 Complete Revocation Refs Attribute Definition
-	/// <code>
-	/// CRLListID ::= SEQUENCE 
-	/// {
-	///		crls	SEQUENCE OF CrlValidatedID
-	/// }
-	/// </code>
-	/// </remarks>
-	public class CrlListID
+    /// <remarks>
+    /// RFC 3126: 4.2.2 Complete Revocation Refs Attribute Definition
+    /// <code>
+    /// CRLListID ::= SEQUENCE 
+    /// {
+    ///		crls	SEQUENCE OF CrlValidatedID
+    /// }
+    /// </code>
+    /// </remarks>
+    public class CrlListID
 		: Asn1Encodable
 	{
-		private readonly Asn1Sequence m_crls;
-
-		public static CrlListID GetInstance(object obj)
-		{
-			if (obj == null)
-				return null;
+        public static CrlListID GetInstance(object obj)
+        {
+            if (obj == null)
+                return null;
+            if (obj is CrlListID crlListID)
+                return crlListID;
+            return new CrlListID(Asn1Sequence.GetInstance(obj));
+        }
 
-			if (obj is CrlListID crlListID)
-				return crlListID;
+        public static CrlListID GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
+        {
+            return new CrlListID(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
+        }
 
-			if (obj is Asn1Sequence asn1Sequence)
-				return new CrlListID(asn1Sequence);
-
-			throw new ArgumentException("Unknown object in 'CrlListID' factory: " + Platform.GetTypeName(obj),
-				nameof(obj));
-		}
+        private readonly Asn1Sequence m_crls;
 
-		private CrlListID(Asn1Sequence seq)
+        private CrlListID(Asn1Sequence seq)
 		{
-			if (seq == null)
-				throw new ArgumentNullException(nameof(seq));
-			if (seq.Count != 1)
-				throw new ArgumentException("Bad sequence size: " + seq.Count, nameof(seq));
+			int count = seq.Count;
+			if (count != 1)
+				throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
 
-			m_crls = (Asn1Sequence)seq[0].ToAsn1Object();
-
-			// Validate
-			m_crls.MapElements(element => CrlValidatedID.GetInstance(element.ToAsn1Object()));
+			m_crls = Asn1Sequence.GetInstance(seq[0]);
+			m_crls.MapElements(CrlValidatedID.GetInstance); // Validate
 		}
 
 		public CrlListID(params CrlValidatedID[] crls)
@@ -52,7 +46,7 @@ namespace Org.BouncyCastle.Asn1.Esf
 			if (crls == null)
 				throw new ArgumentNullException(nameof(crls));
 
-			this.m_crls = new DerSequence(crls);
+			m_crls = DerSequence.FromElements(crls);
 		}
 
 		public CrlListID(IEnumerable<CrlValidatedID> crls)
@@ -60,17 +54,11 @@ namespace Org.BouncyCastle.Asn1.Esf
 			if (crls == null)
                 throw new ArgumentNullException(nameof(crls));
 
-            this.m_crls = new DerSequence(Asn1EncodableVector.FromEnumerable(crls));
+            m_crls = DerSequence.FromVector(Asn1EncodableVector.FromEnumerable(crls));
 		}
 
-		public CrlValidatedID[] GetCrls()
-		{
-            return m_crls.MapElements(element => CrlValidatedID.GetInstance(element.ToAsn1Object()));
-		}
+		public CrlValidatedID[] GetCrls() => m_crls.MapElements(CrlValidatedID.GetInstance);
 
-		public override Asn1Object ToAsn1Object()
-		{
-			return new DerSequence(m_crls);
-		}
+		public override Asn1Object ToAsn1Object() => new DerSequence(m_crls);
 	}
 }