Currently, the TPM itself is the root of trust for randomness in
authvalues used for creating Primary Keys.
This is susceptible to physical attacks over the TPM bus.
* Get authvalues via the 'getrandom' crate
getrandom retrieves random data from the (operating) system sources
and assumes "that the system always provides high-quality
cryptographically secure random data, ideally backed by hardware
entropy sources", so the administrator of the platfrom should take
this into account.
Note: This change may slow down the tests as accessing random values
from the OS instead of the TPM may be slower.
Currently, the TPM itself is the root of trust for randomness in authvalues used for creating Primary Keys. This is susceptible to physical attacks over the TPM bus.