Calling SignedCMS.Decode takes too long

Question

Is there any reason that calling SignedCMS.Decode would take 15 seconds or more? I have the following code:

SignedCms signedCms = new SignedCms();
signedCms.Decode(postedData);

where postedData is a byte array of a signed CMS message. Sometimes the function call returns instantly, but most of the time, it takes 10-15 seconds to return causing the message sender to timeout.

This seems to happen whether or not the debugger is attached to the process.

Answer 1

So I narrowed it down to an instantiation of Oid in one of the functions that the Decode function calls. The source is available at Reference Source .NET Framework 4.5.1.

I tested using:

System.Security.Cryptography.Oid oid = new System.Security.Cryptography.Oid("1.2.840.113549.1.7.1");

I also found this link with a similar problem.

Interestingly, disconnecting my wireless adapter, the Oid instantiation occurs immediately, which leads me to believe that it may be network/DNS related (I have not idea what the Oid instantiation is doing). After reconnecting my adapter SignedCms.Decode is working as normal. Another option I read is to remove my computer from the domain and then rejoin. Haven't tried it yet.

Maybe this will help anyone else that is have the same (or similar) problem.