TPM Capabilities

TPM capabilities related to integrity checking comprise functions for directly operating on PCRs and DIRs.

The formal definition of these capabilities can be found in the latest TCPA specification. The capability names used in this section are exactly those used in the TCPA specification.

Functions for Directly Operating on PCRs

In this section, some of the commands that operate on PCRs are described. The following three TCPA capabilities are considered:

  • TPM_Extend

  • TPM_PcrRead

  • TPM_Quote

TPM_Extend

This capability is used to update a given PCR with a measurement of a given event. It does not require authorization.

This command requires the following inputs:

  • The index of the PCR to be modified

  • A 160-bit value representing the event ...

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