tree abe7e989907451f9f16bd117f470847d39674ed8
parent aa7bf63978082e4e55c0e11836964d8996f22c53
author Stephen Boyd <swboyd@chromium.org> 1541659399 -0800
committer chrome-bot <chrome-bot@chromium.org> 1543307649 -0800

firmware: tpm2_lite: Implement TlclGetRandom()

Implement support for getting random bytes from the TPM in the tpm2
library. The intent is to use this to seed the kaslr-seed DT property on
ARM devices.

BRANCH=None
BUG=None
TEST=Generate some random bytes in depthcharge using this API,
and 'stop trunksd; tpmc rand <size>' with sizes (0, 1, 0xf0, and
0xf1) on the device and see the last one fail

Change-Id: Ied0dc1ead70ac4daa2cee315516160ec100039be
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1327187
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Andrey Pronin <apronin@chromium.org>