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927e01da02
The previous implementation of DCRYPTO_app_cipher
consumed roughly 16ms to cipher a 16kB buffer
(i.e. performance that is far worse than the
hardware is capable of).
This change speeds up the implementation by about
85%, to the tune of roughly 2.2ms for a 16kB buffer.
The gains originate from various sources: loop
unrolling, data-pipelining, eliminating local
variables (to reduce register pressure), eliminating
support for unaligned input/output data, compiling
hot code with -O (rather the default -Os), and
using the hidden key-ladder, which need only be
setup once per reset.
This change also switches from AES-128 to AES-256.
BRANCH=none
BUG=chrome-os-partner:62260
TEST=make buildall succeeds;
cipher command succeeds;
TCG tests pass
Change-Id: I133741be6d9f1353d6ae732d0e863b4b18cc8c9e
Signed-off-by: nagendra modadugu <ngm@google.com>
Reviewed-on: https://chromium-review.googlesource.com/433359
Commit-Ready: Nagendra Modadugu <ngm@google.com>
Tested-by: Nagendra Modadugu <ngm@google.com>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly