Have you tried using SSL Dump for this purpose?
NeonFlash
From: Robert Kochem <robert@xxxxxxxxxxxxxxxx>
To: wireshark-users@xxxxxxxxxxxxx
Sent: Tuesday, October 18, 2011 11:46 PM
Subject: [Wireshark-users] Extracting SSL certificate from SSL handshake
Hi,
I am trying to extract the public certificate presented in the "Server
Hello" message of an SSL handshake.
The SSL dissector highlights the certificate in the data stream but it
seems not to be possible to do something else than just look at the data.
Why is it not possible to do anything with the data in that window?
Robert
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