Nicolas Boichat 77e7913b69 usb_update: Add handler for pairing challenge command ...

Handle UPDATE_EXTRA_CMD_PAIR_CHALLENGE command, where the
lid sends a random x25519 public key, and nonce, and the base
replies with its own (stable) x25519 public key, and computes
a shared secret using its private key to verify its identity.

BRANCH=none
BUG=b:38486828
TEST=Flash hammer, ./usb_updater2 -c always reports the same
     device public key, and authenticator is correct.

Change-Id: Ida60ffa7476794ee92669951c740dbe35950fb9c
Reviewed-on: https://chromium-review.googlesource.com/532475
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

2017-06-15 07:07:40 -07:00

6.5 KiB

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