1 files changed, 36 insertions, 52 deletions

diff --git a/crypto/src/asn1/ocsp/RevokedInfo.cs b/crypto/src/asn1/ocsp/RevokedInfo.cs
index e6438dd08..d2395e186 100644
--- a/crypto/src/asn1/ocsp/RevokedInfo.cs
+++ b/crypto/src/asn1/ocsp/RevokedInfo.cs
@@ -1,77 +1,60 @@
 using System;
 
 using Org.BouncyCastle.Asn1.X509;
-using Org.BouncyCastle.Utilities;
 
 namespace Org.BouncyCastle.Asn1.Ocsp
 {
     public class RevokedInfo
         : Asn1Encodable
     {
-        private readonly Asn1GeneralizedTime revocationTime;
-        private readonly CrlReason revocationReason;
-
-		public static RevokedInfo GetInstance(
-			Asn1TaggedObject	obj,
-			bool				explicitly)
-		{
-			return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
-		}
-
-		public static RevokedInfo GetInstance(
-			object obj)
-		{
-			if (obj == null || obj is RevokedInfo)
-			{
-				return (RevokedInfo) obj;
-			}
+        public static RevokedInfo GetInstance(object obj)
+        {
+            if (obj == null)
+                return null;
+            if (obj is RevokedInfo revokedInfo)
+                return revokedInfo;
+            return new RevokedInfo(Asn1Sequence.GetInstance(obj));
+        }
 
-			if (obj is Asn1Sequence)
-			{
-				return new RevokedInfo((Asn1Sequence) obj);
-			}
+        public static RevokedInfo GetInstance(Asn1TaggedObject obj, bool explicitly)
+        {
+            return new RevokedInfo(Asn1Sequence.GetInstance(obj, explicitly));
+        }
 
-            throw new ArgumentException("unknown object in factory: " + Platform.GetTypeName(obj), "obj");
-		}
+        private readonly Asn1GeneralizedTime m_revocationTime;
+        private readonly CrlReason m_revocationReason;
 
-		public RevokedInfo(
-            Asn1GeneralizedTime revocationTime)
+        public RevokedInfo(Asn1GeneralizedTime revocationTime)
 			: this(revocationTime, null)
 		{
 		}
 
-		public RevokedInfo(
-            Asn1GeneralizedTime revocationTime,
-            CrlReason           revocationReason)
+        public RevokedInfo(Asn1GeneralizedTime revocationTime, CrlReason revocationReason)
         {
-			if (revocationTime == null)
-				throw new ArgumentNullException("revocationTime");
-
-			this.revocationTime = revocationTime;
-            this.revocationReason = revocationReason;
+			m_revocationTime = revocationTime ?? throw new ArgumentNullException("revocationTime");
+            m_revocationReason = revocationReason;
         }
 
-		private RevokedInfo(
-            Asn1Sequence seq)
+        private RevokedInfo(Asn1Sequence seq)
         {
-            this.revocationTime = (Asn1GeneralizedTime)seq[0];
+            int count = seq.Count;
+            if (count < 1 || count > 2)
+                throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
+
+            int pos = 0;
+
+            m_revocationTime = Asn1GeneralizedTime.GetInstance(seq[pos++]);
+
+            m_revocationReason = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 0, true,
+                (t, e) => new CrlReason(DerEnumerated.GetInstance(t, e)));
 
-			if (seq.Count > 1)
-            {
-                this.revocationReason = new CrlReason(
-					DerEnumerated.GetInstance((Asn1TaggedObject) seq[1], true));
-            }
+            if (pos != count)
+                throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
         }
 
-		public Asn1GeneralizedTime RevocationTime
-		{
-			get { return revocationTime; }
-		}
+        public Asn1GeneralizedTime RevocationTime => m_revocationTime;
 
-		public CrlReason RevocationReason
-		{
-			get { return revocationReason; }
-		}
+        public CrlReason RevocationReason => m_revocationReason;
 
 		/**
          * Produce an object suitable for an Asn1OutputStream.
@@ -83,8 +66,9 @@ namespace Org.BouncyCastle.Asn1.Ocsp
          */
         public override Asn1Object ToAsn1Object()
         {
-            Asn1EncodableVector v = new Asn1EncodableVector(revocationTime);
-            v.AddOptionalTagged(true, 0, revocationReason);
+            Asn1EncodableVector v = new Asn1EncodableVector(2);
+            v.Add(m_revocationTime);
+            v.AddOptionalTagged(true, 0, m_revocationReason);
             return new DerSequence(v);
         }
     }