1 files changed, 6 insertions, 1 deletions
diff --git a/crypto/src/asn1/DerNull.cs b/crypto/src/asn1/DerNull.cs
index 01a2e3c72..1ee374db4 100644
--- a/crypto/src/asn1/DerNull.cs
+++ b/crypto/src/asn1/DerNull.cs
@@ -16,7 +16,12 @@ namespace Org.BouncyCastle.Asn1
 		{
 		}
 
-		internal override void Encode(Asn1OutputStream asn1Out, bool withID)
+        internal override int EncodedLength(bool withID)
+        {
+            return Asn1OutputStream.GetLengthOfEncodingDL(withID, 0);
+        }
+
+        internal override void Encode(Asn1OutputStream asn1Out, bool withID)
 		{
             asn1Out.WriteEncodingDL(withID, Asn1Tags.Null, ZeroBytes);
         }