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This change includes hardware and software support for SHA1/256 on CR50. When running in the RO image, only hardware sha256 support is included. When running in the RW image, the code auto-selects between the software and hardware implementation. Software implementation path is taken if the hardware is currently in use by some other context. Refactor the CR50 loader to use this abstraction. The existing software implementation for SHA1 and SHA256 is used for the software path. CQ-DEPEND=CL:*239385 BRANCH=none TEST=EC shell boots fine (implies that SHA256 works) BUG=chrome-os-partner:43025 Change-Id: I7bcefc12fcef869dac2e48793bd0cb5ce8e80d5b Signed-off-by: nagendra modadugu <ngm@google.com> Signed-off-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/313011