1 files changed, 18 insertions, 2 deletions
diff --git a/crypto/src/asn1/x509/SubjectPublicKeyInfo.cs b/crypto/src/asn1/x509/SubjectPublicKeyInfo.cs
index fa1fda4ab..c6f4838db 100644
--- a/crypto/src/asn1/x509/SubjectPublicKeyInfo.cs
+++ b/crypto/src/asn1/x509/SubjectPublicKeyInfo.cs
@@ -20,11 +20,27 @@ namespace Org.BouncyCastle.Asn1.X509
             return new SubjectPublicKeyInfo(Asn1Sequence.GetInstance(obj));
         }
 
-        public static SubjectPublicKeyInfo GetInstance(Asn1TaggedObject obj, bool explicitly)
+        public static SubjectPublicKeyInfo GetInstance(Asn1TaggedObject obj, bool explicitly) =>
+            new SubjectPublicKeyInfo(Asn1Sequence.GetInstance(obj, explicitly));
+
+        public static SubjectPublicKeyInfo GetOptional(Asn1Encodable element)
         {
-            return new SubjectPublicKeyInfo(Asn1Sequence.GetInstance(obj, explicitly));
+            if (element == null)
+                throw new ArgumentNullException(nameof(element));
+
+            if (element is SubjectPublicKeyInfo subjectPublicKeyInfo)
+                return subjectPublicKeyInfo;
+
+            Asn1Sequence asn1Sequence = Asn1Sequence.GetOptional(element);
+            if (asn1Sequence != null)
+                return new SubjectPublicKeyInfo(asn1Sequence);
+
+            return null;
         }
 
+        public static SubjectPublicKeyInfo GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit) =>
+            new SubjectPublicKeyInfo(Asn1Sequence.GetTagged(taggedObject, declaredExplicit));
+
         private readonly AlgorithmIdentifier m_algorithm;
         private readonly DerBitString m_publicKey;