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Add support for SHA256 based HKDF key derivation as specified in RFC 5869. This change includes test vectors from the RFC. BRANCH=none BUG=chrome-os-partner:43025,chrome-os-partner:47524 TEST=tests under test/tpm2 pass Change-Id: I7d0e4e92775b74c41643f45587fc08f56d8916aa Signed-off-by: nagendra modadugu <ngm@google.com> Reviewed-on: https://chromium-review.googlesource.com/336091 Commit-Ready: Nagendra Modadugu <ngm@google.com> Tested-by: Nagendra Modadugu <ngm@google.com> Reviewed-by: Marius Schilder <mschilder@chromium.org>