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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-09-22 10:54:43 +01:00
parent d03f483dbe
commit c0633bc777
1 changed files with 6 additions and 0 deletions
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6
library/constant_time_impl.h
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@ -398,6 +398,12 @@ static inline mbedtls_mpi_uint mbedtls_ct_mpi_uint_if_else_0(mbedtls_ct_conditio
static inline int mbedtls_ct_error_if(mbedtls_ct_condition_t condition, int if1, int if0)
{
/* Coverting int -> uint -> int here is safe, because we require if1 and if0 to be
* in the range -32767..0, and we require 32-bit int and uint types.
*
* This means that (0 <= -if0 < INT_MAX), so negating if0 is safe, and similarly for
* converting back to int.
*/
return -((int) mbedtls_ct_if(condition, (mbedtls_ct_uint_t) (-if1),
(mbedtls_ct_uint_t) (-if0)));
}