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Ask questionsHow to identify which TPM 2.0 PCR Bank is being used

On https://docs.microsoft.com/en-us/windows/security/information-protection/tpm/switch-pcr-banks-on-tpm-2-0-devices, there is no documented way to identify which PCR Bank is being used. For example, if you have a TPM 2.0 machine with SHA-1 and SHA-256 PCR Banks, it would be good to document how you can identify which one is being used.

Example text:

How can I identify which PCR bank is being used?

You can identify which PCR bank is currently used by Windows by looking at the registry.

Registry information

Registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\IntegrityServices

DWORD: TPMActivePCRBanks

Defines which PCR banks are currently active

Registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\IntegrityServices

DWORD: TPMDigestAlgID

Algorithm ID of the PCR bank that Windows is currently using. (For the full list of supported algorithms, see the TCG Algorithm Registry.)

MicrosoftDocs/windows-itpro-docs

Answer questions alrosado

The issue I have is I am being asked how to identify if TPM 2.0 is using SHA 256 and nowhere in the documentation does it specify how to query that.

useful!

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