Hi users,
Using trousers-tpm-tools on Ubuntu, specifically tpm_getpubek, the
properties of my PubEK are weird. I've seen this on two machines with
different TPM vendors.
This looks correct, straight from the driver:
root@ubuntu:~# cat /sys/class/misc/tpm0/device/pubek
Algorithm: 00 00 00 01
Encscheme: 00 03
Sigscheme: 00 01
Parameters: 00 00 08 00 00 00 00 02 00 00 00 00
Modulus length: 256
Modulus:
[censored]
This is not correct, notice the UNKNOWNS:
root@ubuntu:~# tpm_getpubek
Public Endorsement Key:
Version: 01010000
Usage: 0x0002 (Unknown)
Flags: 0x00000000 (!VOLATILE, !MIGRATABLE, !REDIRECTION)
AuthUsage: 0x00 (Never)
Algorithm: 0x00000020 (Unknown)
Encryption Scheme: 0x00000012 (Unknown)
Signature Scheme: 0x00000010 (Unknown)
Public Key:
[censored, agrees with previous command]
I wrote my own utility using the Tspi interface directly, to rule out
tpm-tools weirdness, but I get results that agree with the tpm_getpubek,
bogus values for the key properties.
The only way I can think to get good properties is to bypass most of the
stack and send the TPM_OwnerReadPubek command straight to TCSD.
Any other ideas or thoughts on why these values are wrong?
Thanks,
-Tadd
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