[Prism54-devel] Re: Prism54 development update

[Jean-Baptiste Note]

Hi Seb,

> As you can see, each byte of the signature seems computed from the rows above 
> it. This is not true for longer packets, but this may be simply some kind of 
> overflow/carrier.

> What would be the point of such a signature ? USB Bulk endpoints already have 
> error detection ; and this algorithm seems quite poor for this purpose. And 
> why didn't they use CRC32 ? It's already implemented in ROM for firmware 
> download.
> This really looks like a lame attempt at making reverse engineering harder.

I'm in for reading the asm and finding out. If they wanted to scramble
the messages, then they'll need to think again.

JB