SSH Diffie-Hellman exchange Decryptor tool

[danilonc at bugnotfound.com (Danilo Nascimento)]

Hi Guys!

Do you know any tool that can decrypt an SSH traffic that was
authenticated via Public-Key?
I have both Server private key and User private key, but i can't
figure out how i can extract the DH Key and then get the clear ssh
session.

I've already tried the ssh_decoder (http://www.cr0.org/progs/sshfun/)
but there is no option to provide the certificates, it tries
brute-forcing the debian vulnerable keys (CVE-2008-0166)

Thanks,
Danilo Nascimento