tree f9ab49a5035e59999d2a16862ea2d2db4d7a9472
parent 97709c0b6e911724a3fdeb27133fa0fbf59f879e
author Yingdi Yu <yuyingdi@gmail.com> 1437105911 -0700
committer Alexander Afanasyev <alexander.afanasyev@ucla.edu> 1483216137 -0800

security: Add new TPM framework

The TPM framework is separated into two parts:
1) The front end class Tpm provides the interface to KeyChain. The public
   interface of Tpm is read-only.
2) The back end classes represent concrete implementations, such as
   tpm::BackEndFile and tpm::BackEndOsx which may also provide
   implementation-specific management interfaces.

New TPM supports different key id type when generating new key.  The
default type is changed to 64-bit random number.

Change-Id: I41154c2ded4b65fb0bef2f4a0d2c5b77843be05d
Refs: #2948