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Nicolas Williams 2021-05-18 17:19:17 -05:00
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Intro/README.md
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@ -346,6 +346,11 @@ used to authenticate the TPM's legitimacy. The EK's public key
("EKpub") can be used to uniquely identify a TPM, and possibly link to
the platform's, and even the platform's user(s)' identities.
The `TPM2_CreatePrimary()` and `TPM2_CreateLoaded()` commands create key
objects deterministically from the hierarchy's seed and the "template"
used to create the key (which includes a "unique" area that provides
"entropy" to the key derivation function).
## Key Wrapping and Resource Management
Key wrapping is encrypting a secret or private key (key encryotion key,
@ -395,11 +400,17 @@ needed.
Because primary keys (for any hierarchy other than the null hierarchy)
are derived deterministically from a built-in and protected seed, and
from a template, they are persistent even when not moved to NV storage
and even when not saved.
and even when not saved as long as the hierarchy's seed is not reset.
(Resetting the endorsement hierarchy seed is a very dramatic action, as
it changes the EK/EKpub and renders any provisioned EKcert useless.
Resetting the storage hierarchy seed is much less dramatic. The NULL
hierarchy is reset every time the TPM resets.)
PCRs always persist, but they get reset on restart.
NV indexes always persist.
NV indexes always persist. (But in disorderly resets/shutdowns a
hybrid NV index may not be sync'ed to NV.)
## Non-Volatile (NV) Indexes