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