173b230588
[ Merge of http://go/wvgerrit/152950 ] This CL introduces several functions for computing a HMAC-SHA256 signature. The functions wrap the OpenSSL/BoringSSL implementation of HMAC(), allowing for common C++ types to be passed in. Several of the functions follow several OEMCrypto conventions for generating signatures (ex. returning OEMCrypto_ERROR_SHORT_BUFFER if signature buffer is too small). Also provided limited wrappers for HMAC-SHA-1, which are used for a limited number of operations within OEMCrypto. Bug: 154055871 Bug: 145026434 Bug: 236317198 Test: hmac_unittest Change-Id: I4a9e56066a7c3f14c7159270503225cd794c1bb6