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mirror of https://github.com/ARMmbed/mbedtls.git synced 2025-05-21 16:05:46 +08:00
Gilles Peskine 5b0589e9ab Fix non-constant-time comparison in mbedtls_mpi_random
Calling mbedtls_mpi_cmp_int reveals the number of leading zero limbs
to an adversary who is capable of very fine-grained timing
measurements. This is very little information, but could be practical
with secp521r1 (1/512 chance of the leading limb being 0) if the
adversary can measure the precise timing of a large number of
signature operations.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-06-04 14:47:24 +02:00
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