tpm: Clean up HMAC validation and computation

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

Eric Biggers posted 2 patches 2 months ago

Download series mbox

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

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

Posted by Eric Biggers 2 months ago

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