Newbie: help with DH key exchange

[Manik Surtani <manik.surtani%conchango.com@localhost>]

Hello, all.

First, I apologise if this is the wrong place for such a posting - I 
just didnt know where I could get help on this.

I am new to ssh internals, although I have been using it as an end user 
for quite a while now.  I have started an ambitious little project to 
write an open source ssh client API in Java - just a chance to learn 
more about the ssh internals.

I have successfully implemented the initial handshaking, and am stuck on 
the DH key exchange at the moment.

I have sent a KEXDH_INIT package, and have received the KEXDH_REPLY, and 
have computed f and H.

What I do not completely understand is how I could verify H using the 
signature s received from the server.  This is using 
diffie-hellman-group1-sha1, so I'd assume that the SHA1 hashing algo has 
been used?  How do I verify the signature though?

Help is much appreciated!

Cheers,
--
Manik Surtani
Conchango
'Innovative Change in Business'

T 44 (0) 1784 221829
M 44 (0) 7786 702 706
E manik.surtani%conchango.com@localhost

http://www.conchango.com

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