linux-kernel - [PATCH v2 0/2] tpm: Clean up HMAC validation and computation

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Message-ID: <20250801212422.9590-1-ebiggers@kernel.org>
Date: Fri,  1 Aug 2025 14:24:20 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: Peter Huewe <peterhuewe@....de>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	linux-integrity@...r.kernel.org
Cc: Jason Gunthorpe <jgg@...pe.ca>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Eric Biggers <ebiggers@...nel.org>
Subject: [PATCH v2 0/2] tpm: Clean up HMAC validation and computation

Patch 1 updates the tpm driver to compare HMAC values in 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.

Changed in v2:
  - Updated commit message of patch 1 to no longer characterize it as a
    fix.  Explained why the side channel seems to have been benign.

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
-- 
2.50.1