1 files changed, 17 insertions, 0 deletions
diff --git a/crypto/src/asn1/Asn1RelativeOid.cs b/crypto/src/asn1/Asn1RelativeOid.cs
index 4a84369c7..d1d9de882 100644
--- a/crypto/src/asn1/Asn1RelativeOid.cs
+++ b/crypto/src/asn1/Asn1RelativeOid.cs
@@ -74,6 +74,23 @@ namespace Org.BouncyCastle.Asn1
             return (Asn1RelativeOid)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
         }
 
+        public static Asn1RelativeOid GetOptional(Asn1Encodable element)
+        {
+            if (element == null)
+                throw new ArgumentNullException(nameof(element));
+
+            if (element is Asn1RelativeOid existing)
+                return existing;
+
+            if (element is IAsn1Convertible asn1Convertible && !(element is Asn1Object) &&
+                asn1Convertible.ToAsn1Object() is Asn1RelativeOid converted)
+            {
+                return converted;
+            }
+
+            return null;
+        }
+
         public static bool TryFromID(string identifier, out Asn1RelativeOid oid)
         {
             if (identifier == null)