[PATCH 0/2] tpm: HMAC fix and cleanup

From: Eric Biggers
Date: Thu Jul 31 2025 - 17:54:24 EST


Patch 1 fixes the HMAC comparison in the tpm driver to be constant-time.

Patch 2 simplifies the HMAC computation in the tpm driver by using the
library API instead of an open-coded HMAC implementation. Note that
this depends on the HMAC library API that was merged for v6.17-rc1.

Eric Biggers (2):
tpm: Compare HMAC values in constant time
tpm: Use HMAC-SHA256 library instead of open-coded HMAC

drivers/char/tpm/Kconfig | 1 +
drivers/char/tpm/tpm2-sessions.c | 104 +++++++++----------------------
2 files changed, 31 insertions(+), 74 deletions(-)


base-commit: d6084bb815c453de27af8071a23163a711586a6c
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2.50.1