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UEFI Utility to Read TPM 2.0 PCRs

In a previous post, I discussed how to retrieve Platform Configuration Register (PCR) values from a discrete TPM (Trusted Platform Module) 1.2 chip (dTPM 1.2) and provided source code for a UEFI shell utility to display the digests from the first 16 PCRs. In this post, I discuss a number of key TPM 2.0 features and provide the source code for a UEFI shell utility to display the digests from the first 24 PCRs of a TPM 2.0 implementation. What is driving the move to TPM 2.0? Simple, TPM 1.2 ((ISO/IEC 11889) only supports one hash algorithm, i.e. SHA1, and

Examining TPM2 ACPI Table

The Advanced Configuration and Power Interface (ACPI) specification was developed to establish industry common interfaces enabling robust operating system directed motherboard device configuration and power management of both devices and entire platforms. This specification has gone from strength to strength over the years and is now maintained by the UEFI Forum. The current version is 6.1. Over the years, the Trusted Computing Group (TCG) has developed various specifications defining an ACPI table and basic methods for use on a TCG compliant platform. The goal is that the ACPI table and ACPI namespace objects provide sufficient information to an operating system