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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>