1 files changed, 17 insertions, 0 deletions
diff --git a/crypto/src/asn1/Asn1TaggedObject.cs b/crypto/src/asn1/Asn1TaggedObject.cs
index 0045ad448..f817a1343 100644
--- a/crypto/src/asn1/Asn1TaggedObject.cs
+++ b/crypto/src/asn1/Asn1TaggedObject.cs
@@ -73,6 +73,23 @@ namespace Org.BouncyCastle.Asn1
             return Asn1Utilities.GetExplicitBaseTagged(CheckInstance(taggedObject, declaredExplicit), tagClass, tagNo);
         }
 
+        public static Asn1TaggedObject GetOptional(Asn1Encodable element)
+        {
+            if (element == null)
+                throw new ArgumentNullException(nameof(element));
+
+            if (element is Asn1TaggedObject existing)
+                return existing;
+
+            if (element is IAsn1Convertible asn1Convertible && !(element is Asn1Object) &&
+                asn1Convertible.ToAsn1Object() is Asn1TaggedObject converted)
+            {
+                return converted;
+            }
+
+            return null;
+        }
+
         private static Asn1TaggedObject CheckInstance(object obj)
         {
             return GetInstance(obj ?? throw new ArgumentNullException(nameof(obj)));