Certain applications of Trust Token need to be able to generate
a large number of keys, instead of storing them all, we provide
an API to take a secret that can be used to generate keys
in a deterministic manner.
Change-Id: I2b61958d1e949a3a47a3c91ab3a866c2e33a9d1d
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/53011
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: Steven Valdez <svaldez@google.com>