[Cryptech Tech] "ksng" branch of Cryptech Alpha firmware now available as a binary package

[Rob Austein]

Thanks to Paul and Fredrik for help fixing the DFU problems.  There
were a few bugs in the upgrade script too, mostly race conditions,
none particularly difficult to fix once Paul dealt with the rest.

With all that done: I can now offer a Yule present for those who are
feeling adventurous: binary packaging of the "ksng" (new keystore
architecture) development branch.

Because of the DFU bugs (and other factors, but mostly the bugs), the
upgrade process for this is a bit tricky.  I've attempted to document
it at:

  https://wiki.cryptech.is/wiki/UpgradeToKSNG

and have tested this with an Alpha whose firmware I first rolled back
to what we were running in Berlin.

Given the tricky nature of the upgrade, it would probably be best if
the first person other than me to try it were someone who already has
(or doesn't mind acquiring) an ST-LINK programmer, just in case
something goes horribly wrong and the upgrade bricks the HSM.

WARNING: there are several incompatible changes between the software
we were running in Berlin and the ksng branch, most notably the
keystore itself (totally changed) and some of the RPC calls used by
the PKCS #11 library.   The PKCS #11 API itself is largely unchanged,
so software which worked over PKCS #11 in Berlin should still work.

Next up will probably be writing a software driver for Pavel's shiny
new Verilog ECDSA point multiplier and packaging that up on another
branch.

At some point we will of course want to merge all these branches and
packages back into a single stream, but I'd like to get a bit more
testing of the new stuff before we do that, so providing a binary
package to ease testing seemed like the way to go.