linux read tpm values quick reference

linux_tpm.md

Check for TPM presence on Linux

Check /dev/

ls /dev/tpm*

If a TPM is present, you may see:

/dev/tpm0

Check /sys/

ls /sys/class/tpm/

Check the kernel logs for any TPM related entries:

dmesg | grep -i tpm

Check for TPM related information in System Management BIOS (SMBIOS) or Desktop Management Interface (DMI) tables:

dmidecode -t bios

Check loaded modules:

lsmod | grep tpm

Interacting with a TPM

Install tpm2-tools:

• Arch-based: pacman -S tpm2-tools
• Debian-based: apt-get install tpm2-tools
• Red Hat-based: yum install tpm2-tools

List properties:

tpm2_getcap properties-fixed

Self test:

tpm2_selftest

Try reading Platform Configuration Registers (PCRs):

tpm2_pcrread sha1:0+sha256:0

See docs: https://tpm2-tools.readthedocs.io/en/latest/