S/MIME and MhOnarc

Hi

I'am woorking on the mailing list project "Sympa" which use
mhonarc (and a part of marcsearch). Now, Sympa  is able to verify
S/MIME signature and to distribute encrypted messages to
subscribers.
How can I plug in MhOnarc openssl in order to show  on the web
that the message was signed ? Any suggestion ?

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Serge Aumont        Comité Réseaux des Universités
                     Campus Beaulieu 
                     35042 Rennes Cedex   +33 2 998 471 47