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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2594 Crypto algorithms, hkdf-sha256/hmac-sha256/aes, are needed to verify integrity of variable data, derive hmac and encryption keys, and encrypt/decrypt varible. Replacing null version source code with real implementations makes sure we can enable full functionalities of protected variable later. Cc: Xiaoyu Lu <xiaoyux.lu@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Guomin Jiang <guomin.jiang@intel.com> Cc: Nishant C Mistry <nishant.c.mistry@intel.com> Signed-off-by: Jian J Wang <jian.j.wang@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>