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Fimrware co-signing tool

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Anonymous (not verified)
Fimrware co-signing tool

Hi,

Trying to get a lab setup going with a DOCSIS 2.0 CMTS. Can anyone suggest a tool which can be used to "co-sign" a firmware load. That is, I have a signed firmware image from the CM manufacturer. I would like to co-sign it with a CoSigner CVC so I can check download with a cosigned image.

Any suggestions for tools to do the co-signing? I'm especially interested in free/cheap implementations!

Thanks! D

cw

Anonymous (not verified)
Fimrware co-signing tool

You can use open source docsis compiler (lookup at sourceforge. the code name:docsis).
We`ve used this sources for developing out own config maker.
Additionally we use Motorola SurfBoard2 config editor. That`s very powerfull tool.

Anonymous (not verified)
Fimrware co-signing tool

Not to hi-jack the thread, but I too am looking for a cheap way to sign firmware upgrades. Anyone have any ideas? Thanks.

Anonymous (not verified)
Fimrware co-signing tool

Ok, I figure what to do, but now I have to figure out "how" to do it.

What you have to do is sign with your code the original firmware. So you need to strip away the manufactures CVC code to create your signature in PKCS7 DER format. After you have done this, you need to then take the signature you created and inject it into the original firmware file into the PKCS7 format with the manufactures CVC code.

I am open to any ideas on how to do any part of the above. Thanks.