iRule to extract X509 Cert parameters and adds them to http header

I am running 10.1 code and need an iRULE that strips the CN: information from a X.509 CERT. Once this information is extracted, we need it added to the request inside the HTTP Header. I see a lot of iRULES out there, but not sure I have found something specific enough. Can someone offer a suggestion or two?

 

 

Thanks,