cr50: add code for the signer utility

This utility reads a binary file, verifies that the first 1024 bytes
of the file are set to zero and replaces this block with a header,
containing the signature and other information required by the recent
CR50 ROM.

A test private key is included, it matches the FPGA ROM public key.

The use convention is simple: two parameters are required, the private
key file name and the binary file name. The signed binary file is saved
in the file with extension ".signed".

BRANCH=none
BUG=chrome-os-partner:43025
TEST=the utility builds using

   g++ -std=c++0x -I . -o signer codesigner.cc publickey.cc -lcrypto

  ec.RO.flat signed with this utility can be successfully bootstrapped
  a CR50 over SPS

Change-Id: I046b13d20f0dd8cff884e37ef966593e01dcb043
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/295208
Reviewed-by: Marius Schilder <mschilder@chromium.org>

0 files changed, 0 insertions, 0 deletions