Unify equality checker functions return value
The equality checker functions always return 0 or 1 value,
thus the type of return value can be the same dispite of the
size of the parameters.
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/library/constant_time.c b/library/constant_time.c
index cb0b309..680d7a1 100644
--- a/library/constant_time.c
+++ b/library/constant_time.c
@@ -168,8 +168,8 @@
* This function is implemented without using comparison operators, as those
* might be translated to branches by some compilers on some platforms.
*/
-size_t mbedtls_cf_size_bool_eq( size_t x,
- size_t y )
+unsigned mbedtls_cf_size_bool_eq( size_t x,
+ size_t y )
{
/* diff = 0 if x == y, non-zero otherwise */
const size_t diff = x ^ y;
@@ -189,7 +189,7 @@
#endif
/* diff1 = (x != y) ? 1 : 0 */
- const size_t diff1 = diff_msb >> ( sizeof( diff_msb ) * 8 - 1 );
+ const unsigned diff1 = diff_msb >> ( sizeof( diff_msb ) * 8 - 1 );
return( 1 ^ diff1 );
}
diff --git a/library/constant_time.h b/library/constant_time.h
index 32e0dfe..962af36 100644
--- a/library/constant_time.h
+++ b/library/constant_time.h
@@ -50,8 +50,8 @@
size_t mbedtls_cf_size_mask_ge( size_t x,
size_t y );
-size_t mbedtls_cf_size_bool_eq( size_t x,
- size_t y );
+unsigned mbedtls_cf_size_bool_eq( size_t x,
+ size_t y );
unsigned mbedtls_cf_size_gt( size_t x,
size_t y );