Manuel Pégourié-Gonnard
ac12767ff3
Fix non-constant-time comparison in mbedtls_ecp_gen_privkey
...
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: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com >
2021-06-01 12:06:57 +02:00
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