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Add functions that derive application specific keys based on FRK2. For the moment, derived keys need to be manually copied into the AES engine. Since key-ladder state depends on the code-signer (prod vs. dev), application derived keys are also different in the two modes. Thus ciphertext blobs produced by prod-signed code cannot be decrypted by dev-signed code. To minimize stack requirements on the hook_task, the SHA context in DCRYPTO_appkey_init() is placed in allocated/freed memory. This SHA object will become unnecessary once the AES engine is seeded directly from the key-ladder. BRANCH=none BUG=chrome-os-partner:55331 TEST=pending Change-Id: Ifb274b15e61be317e02ec31fc52f9a41e06dcba3 Signed-off-by: nagendra modadugu <ngm@google.com> Signed-off-by: Marius Schilder <mschilder@chromium.org> Signed-off-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/428170 Reviewed-by: Nagendra Modadugu <ngm@google.com>