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As discussed in the associated bug, interleaving usage of the key-ladder and the h/w SHA engine is not supported by the underlying hardware. So far this limitation has not been an issue since the key-ladder was not used during run-time, however this is changing with encrypted NVMEM support. Once we can guarantee that the key-ladder will not be invoked between SHA_init() and final(), we can re-enable h/w support for TPM2 code. The performance impact to TPM2 operations is expected to be minor, since the data being hashed is at most a few kB. BRANCH=none BUG=chrome-os-partner:55331 TEST=TCG tests pass Change-Id: Ia0a565af7179d0b3745eb465220ba844feaecb92 Signed-off-by: nagendra modadugu <ngm@google.com> Reviewed-on: https://chromium-review.googlesource.com/430292 Commit-Ready: Marius Schilder <mschilder@chromium.org> Tested-by: Marius Schilder <mschilder@chromium.org> Reviewed-by: Marius Schilder <mschilder@chromium.org> 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